KR101278827B1 - Pipe having grooved inner surface, apparatus for producing the same and method for producing the same - Google Patents

Abstract

The present invention provides an inner groove forming tube which is excellent in heat conduction performance, can be miniaturized and reduced in weight, and can realize resource saving, and a manufacturing method capable of efficiently and stably manufacturing such inner groove forming tube; It is an object to provide a manufacturing apparatus.
In the present invention, for example, twisting of a groove with respect to the central axis of the tube using an apparatus for producing an inner surface grooved tube having a shaft diameter means for drawing and shrinking the element pipe and a groove processing means for forming a plurality of grooves in the inner tube inner surface. When the angle is β (degrees), and the vertex angle of the pin formed between the adjacent grooves and the grooves is α (degrees), β is 30 to 60, α is 5 to 20, and the outer diameter is D (mm), When depth is H (mm) and the cross-sectional area with respect to the axial direction of a tube is A _C (mm <2>), D is 6 or less, H is 0.07 or more, and constitutes the inner surface grooved tube whose A < _C <0.8 * D.

Description

Inner groove forming tube, its manufacturing apparatus and its manufacturing method {PIPE HAVING GROOVED INNER SURFACE, APPARATUS FOR PRODUCING THE SAME AND METHOD FOR PRODUCING THE SAME}

TECHNICAL FIELD This invention relates to the inner surface grooved tube used as a heat exchanger tube for heat exchangers, such as a refrigerator and an air conditioner, and its manufacturing method.

In the heat exchanger tube used for the heat exchanger of heat pump apparatuses, such as an air conditioner and a hot water heater, in order to improve the heat exchange performance, the inner surface grooved tube made from copper, for example, which groove | channel was given to the inner surface in many cases is used.

In recent years, in order to meet the demand for miniaturization and high efficiency of the heat exchanger, the grooves formed on the inner surface are deepened, the torsion angle (lead angle) of the grooves is increased, the fins are sharply shaped, and the pipe thickness is thinned. By producing the inner grooved tube, the performance of the heat exchanger is improved.

For example, Patent Document 1 below proposes a small-diameter heat transfer tube having an outer diameter of 3 to 6 mm, which is effective for downsizing a heat exchanger. However, the workability of the groove is assumed to be performed by a conventional processing method. Is small, and the degree of performance improvement is small.

In addition, since the vertex angle of the inner surface fin is large and cannot be said to be a sharp shape, it has been difficult to reduce the weight (reduce the weight of material used per unit length) in order to cope with the recent resource saving of metal materials.

Moreover, although the example of the high performance heat exchanger tube which deepened the inner surface groove depth is proposed in following patent document 2, it aims at what is an outer diameter of 6 mm or more.

In Patent Document 3 below, an example of a high-performance tube having a deep internal groove depth and a large torsion angle has been proposed, but a heat transfer tube having an outer diameter of about 7 mm has been conventionally used as a heat transfer tube for air conditioning.

As described above, in Patent Documents 2 and 3 described above, although the groove depth of the inner surface of the heat transfer tube is increased or the torsion angle is increased, high performance can be achieved. There was no. The reason for this is that if the pipes are the same thickness and have different diameters, the breaking load is smaller for the smaller diameter pipe. Therefore, if the pipe is small in diameter, the processing load of the inner groove exceeds the breaking load of the pipe in the conventional processing method. It could not be processed.

In the manufacturing method of such an inner side grooved tube, the method of using the auxiliary drawing apparatus which pinches the said metal tube between a pair of caterpillar and moves this caterpillar at the position between the said drawing die and the said pressing means is proposed. (See Patent Document 4). Accordingly, it is possible to easily manufacture an inner grooved metal tube with a small outer diameter, a thin thickness, a deep groove on the inner surface, or a large torsion angle (lead angle) with respect to the tube axis of the groove without causing breakage of the metal tube. It is.

Further, in order to cope with the higher precision of the inner grooved tube, the diameter of the element pipe is reduced to the base that is movable in the drawing direction with respect to the drawing means for drawing the grooved inner surface grooved tube. To fix the shafting means, the auxiliary drawing device, the grooving means composed of the drawing dies and the floating plug, and the finishing device for finishing the outer surface of the grooved shaft diameter tube, and the drawing means to draw the grooved inner surface grooved tube. At the time, the manufacturing apparatus of the inner surface groove | channel formation pipe | tube provided with the expectation load detection apparatus which detects the load on the expectation which moves relative with respect to a drawing means is proposed (refer patent document 5).

In patent document 5, based on the detected value of the auxiliary drawing apparatus which assists the drawing of the pipe | tube by a drawing means, the drawing force detection means which detects drawing force, and the drawing force detection means, the drawing force with respect to the said canal is acquired within a target range. The manufacturing apparatus of the inner surface grooved tube provided with the control means to control so that it may control, and the manufacturing method using this manufacturing apparatus are proposed.

However, in Patent Document 5, the target load value at which the processing load detected by the drawing force detecting means is optimal in operating the manufacturing apparatus for the inner grooved tube forming tube is not apparent from the relationship with the cross-sectional area in the tube axis direction. For this reason, the auxiliary drawing apparatus cannot be controlled appropriately, and a high performance heat exchanger tube cannot be manufactured efficiently and stably.

The manufacturing apparatus of the inner surface grooved tube of patent document 6 is equipped with the shaft diameter die and a floating plug in order to reduce a small pipe, and the groove formation plug and the pressing tool which form many grooves in the inner pipe inner surface in the pull-out direction downstream of a small pipe. Equipped with. Moreover, between the said shaft diameter die and the said processing head, in order to prevent the fracture | rupture of the element pipe in the middle of a process, it is the structure provided with the wiper, a drawing device (intermediate drawing device), and an intermediate shaping die along the drawing direction of an element pipe. .

Similarly, the manufacturing apparatus of the inner surface grooved tube of Patent Literature 6 also has a shaft diameter means for reducing the diameter of the element pipe, a groove processing means for forming a plurality of grooves in the inner tube inner surface on the downstream side in the drawing direction of the element pipe, and the inner surface groove formation after processing A drawing means which also serves as a winding drum for winding the tube is provided. Moreover, it is the structure provided with the auxiliary drawing apparatus (intermediate drawing apparatus) which assists the drawing means, and the control means which controls so that the drawing force of the said drawing means or auxiliary drawing apparatus may be settled in a target range.

According to the manufacturing apparatus of the inner surface grooved tube disclosed by patent documents 5 and 6, the draw load at the time of a process can be reduced by an intermediate drawing apparatus, and the breakage of a pipe | tube can be suppressed in the middle of a process.

However, even if the total tensile load can be reduced, when the variation in the tensile load occurs, processing corresponding to such load variation cannot be sufficiently performed.

For example, in the manufacturing apparatus disclosed in Patent Document 6, a wiper is provided in the intermediate drawing apparatus and a wiper for preventing the pad in contact with the element pipe from slipping with respect to the element pipe is provided, or a measure is provided to define the groove shape of the pad. However, load fluctuations can still occur.

Japanese Patent Laid-Open Publication No. 04-260792 Japanese Patent Laid-Open Publication No. 08-21696 Japanese Patent Laid-Open No. 2001-241877 Japanese Patent No. 2950289 Japanese Patent Laid-Open No. 2008-87004 Japanese Patent Publication No. 2008-36640

Accordingly, the present invention provides an inner grooved tube that can be efficiently and stably manufactured, and can be efficiently and stably manufactured with excellent heat conduction performance, which can be miniaturized and reduced in weight, and can realize resource saving. It is an object to provide a device.

In the inner grooved tube of the present invention, when the torsion angle of the groove with respect to the center axis of the tube is β (degrees), and the vertex angle of the pin formed between the adjacent grooves and the grooves is α (degrees), β is 30. When 60 and α are 5 to 20, the outer diameter is D (mm), the depth of the groove is H (mm), and the cross-sectional area in the axial direction of the pipe is A _C (mm 2), D is 6 or less and H is 0.07. or more, it characterized in that the a _C <0.8 × D.

With the above configuration, the groove depth can be made larger, the torsion angle can be made larger, and the vertex angle can be made smaller than the conventional inner surface groove forming tube, and the heat transfer performance can be increased. In addition, by reducing the cross-sectional area, weight reduction and resource saving can be achieved.

In addition, by using the inner grooved tube as a high-performance, lightweight heat transfer tube, the heat exchanger can be miniaturized and reduced in weight.

In addition, as an aspect of the present invention, the inner surface grooved tube may have an outer diameter D (mm) of 3 or more.

According to the said structure, an inner surface grooved tube can be used as a more preferable heat exchanger tube for heat pump apparatuses, such as an air conditioner or a hot water heater.

In addition, as an aspect of the present invention, the inner grooved tube may have a depth H (mm) of 0.10 to 0.30.

According to the said structure, an inner surface grooved tube can be used as a more preferable heat exchanger tube for heat pump apparatuses, such as for air conditioners or a hot water heater.

Moreover, the manufacturing method of the inner surface grooved tube of this invention uses the manufacturing apparatus of the inner surface grooved tube provided with the shaft diameter means which draws and shrinks an element pipe, and the groove processing means which forms many grooves in an inner pipe inner surface. It is done.

The said shaft diameter means can be comprised, for example with the shaft diameter dice | dies which have the die-hole in which the mortar of the mortar of the pestle which becomes wider toward the upstream side is formed. The floating plug inserted in the element pipe can be arrange | positioned at the corresponding position of the die hole of this shaft diameter dice.

The grooving means may comprise, for example, a rolling tool composed of a grooving plug connected to the floating plug, and a roller or ball that presses and rotates the shaft tube against the grooving plug. .

As an aspect of this invention, the manufacturing method of an inner surface grooved tube includes the drawing means which combined with the winding drum which winds up the inner surface grooved tube which processed on the downstream side of the said groove processing means to the manufacturing apparatus of the said inner surface grooved tube; An auxiliary drawing means for drawing the element pipe between the shaft reduction means and the groove processing means, a movable means supporting the shaft reduction means, the auxiliary drawing means and the groove processing means, and movable in the drawing direction with respect to the installation portion; It is provided with the load detection means which detects the processing load which acts according to the movement of the said moving means with respect to the said installation part, and the control means which controls the said auxiliary drawing means based on the said processing load detected by the said load detection means. Using an apparatus for producing an inner grooved tube, a torsional angle of the groove with respect to the center axis of the tube is formed between β (degrees) and an adjacent groove and the groove. When the vertex angle of the pin is α (degrees), β is 30 to 60, α is 5 to 20, the outer diameter is D (mm), the depth of the groove is H (mm), and the cross-sectional area with respect to the axial direction of the pipe is When A _C (mm 2), D is 6 or less, H is 0.07 or more, and A _C <0.8 × D, a method for producing an inner surface grooved tube, wherein the processing load is passed through P (N) and the groove processing means. When the cross-sectional area of the subsequent pipe in the axial direction is A _C1 (mm 2) and the breaking stress of the pipe after passing through the grooving means is σ _M (N / mm 2), P is 0.5 times of (A _C1 × σ _M ). Preferably, the auxiliary drawing means is controlled to be between 0.9 times.

The said drawing means can be comprised, for example with a winding apparatus, such as a winding drum, which draws out and winds up the inner surface grooved tube which processed the element pipe from the downstream side, for example.

Said auxiliary drawing means can be comprised, for example by the apparatus which feeds an axis diameter pipe between a belt or a pad, and feeds it toward a groove processing means.

According to the said manufacturing method, a groove depth can be made larger than a conventional inner surface grooved tube, a torsion angle can be made large, and a vertex angle can be obtained, and an inner surface grooved tube with large heat transfer performance can be obtained. In addition, by reducing the cross-sectional area, it is possible to obtain a lightweight and resource-saving inner surface grooved tube.

In addition, a high-performance, lightweight heat transfer tube can be efficiently and stably obtained, and the heat exchanger can be miniaturized and reduced in weight.

Here, it is P≥0.5 × _{(A C1 × σ M),} P <0.5 × If (A _C1 σ × _M), with a slight variation in the drive force of the auxiliary drawing unit is easy to become a change in the pipe inner surface shape, the groove depth This is because the back is not constant.

If P≤0.9 × (A _C1 × σ _M ) is P> 0.9 × (A _C1 × σ _M ), the pulling force may exceed the breaking load of the tube due to slight thickness variation or fluctuation of the pulling force, This is because it is broken.

In addition, the cross-sectional area A _C (mm 2) of A _C <0.8 × D indicates that the tube is thinner than in the prior art, but when the thickness of the tube is thin, it is easy to buckle and the groove is formed by the grooving means. Machining becomes difficult. In addition, the greater the tensile force in the axial direction, the more difficult it is to deform in the circumferential direction, which makes the groove forming process more difficult.

In contrast, according to the manufacturing method of the present invention, as described above, by controlling the auxiliary drawing means such that P is between 0.5 times and 0.9 times of (A _C1 × σ _M ), the load in the drawing direction is reduced. Even if the tube is thin, the buckling in the circumferential direction can be suppressed.

Here, the cross-sectional area with respect to the axial direction of the pipe after passing through the grooving means is not limited to the cross-sectional area (A _C1 ) with respect to the axial direction of the primary finishing pipe after passing through the grooving means. It shall also include the cross-sectional area A _{C with} respect to the axial direction of the final finishing tube which further processed.

On the other hand, a sinking is a process which does not directly process a pipe inner surface, but mainly reduces an outer diameter, for example, the process which passes through a sinking die and pulls out.

Moreover, as an aspect of this invention, it is preferable that outer diameter D (mm) is three or more.

In heat transfer tubes of heat pumps such as air conditioners, pressure loss is important in addition to the heat transfer performance, and when the pressure loss increases, the load of the pump or compressor (compressor) for transferring the refrigerant increases, which degrades the performance of the heat pump. For practical reasons, the outer diameter D (mm) is preferably 3 or more.

In addition, as an aspect of the present invention, the depth H (mm) of the groove may be 0.10 to 0.30.

The heat transfer tube used for heat pumps such as air conditioners is pushed and widened by a tool such as a mandrel from the inside of the tube so as to be pressed against the aluminum fin, and at that time, the inner fin is crushed, which is about 0.01 to 0.02 mm lower. In view of that, it is preferable that the groove depth is 0.1 mm or more.

In addition, when the inner surface fin is too high, the pressure loss increases or the material weight increases, so the groove depth H (mm) is preferably 0.3 or less.

The auxiliary drawing means may comprise, for example, a pair of endless members (loop members) sandwiching the elementary pipe from both sides with respect to the axial direction, and the belt and the caterpillar with the tube sandwiched therebetween. By rotating an endless member such as the back, the drawing by the drawing means of the pipe can be assisted.

The load detecting means can be configured by means capable of detecting a load such as a load cell.

As a load which the said load detection means detects, a compressive load, a tensile load, and a moment load are mentioned, for example.

The inner grooved tube can be formed of a material having excellent thermal conductivity such as copper, aluminum, or an alloy thereof.

Moreover, as an aspect of this invention, the manufacturing apparatus of the said inner surface grooved tube is equipped with the said shaft diameter means, the said groove processing means, and the drawing means which draws out the grooved inner surface groove forming tube in this order from an upstream side, It is provided between the said shaft diameter means and the said groove processing means, The conveyance auxiliary means (the said auxiliary drawing means) which conveys a reduced diameter pipe to the conveyance direction toward the said groove processing means, The said shaft diameter means, and the said transfer assistance means are fixed A movable table which is relatively movable with respect to the groove processing means in parallel with the drawing direction of the drawing means, and the base with which the groove processing means is fixed and relatively movable with respect to the drawing means in parallel with the drawing direction; Inspecting the load in the direction of relative movement applied to the movable table when the movable table moves relative to the groove processing means. A moving table load detection device, an expected load detection device for detecting a load in the direction of the relative movement applied to the base when the base is relatively moved relative to the drawing means, and a control means for controlling the operation of the transfer aid means. And an apparatus for producing an inner surface grooved tube configured to relatively move the movable table in the drawing direction with respect to the base, wherein the control means comprises: a feed assist speed of the feed aid; It is preferable that it is a manufacturing method of the inner surface grooved pipe which adjusts at least any one of the feed assistance torque of an auxiliary means based on the difference of the load which the said mobile stand load detection apparatus and the said expected load detection apparatus detected.

In addition, as an aspect of the present invention, the feed assist speed adjusted by the control means is defined as the first feed assist speed, and the feed assist torque adjusted by the control means is determined based on the correlation with the feed assist torque. It can be set as the control to adjust with a 2nd feed assistance speed.

The movable table and the base can be configured as, for example, a table that can freely slide with a wheel on its bottom.

The mobile stand load detection device and the expected load detection device can be configured with an appropriate detector capable of detecting a load such as a load cell.

In addition, as an aspect of the present invention, using the manufacturing apparatus of the inner grooved pipe forming tube, in the process of the small pipe progresses in the drawing direction, the shaft diameter processing step of shrinking the small pipe and the groove processing step of forming a plurality of grooves in the inner pipe inner surface The intermediate diameter drawing step of drawing the element pipe reduced in the shaft diameter processing step is performed while the shaft diameter processing step and the groove processing step are performed, and the shaft diameter processing step is disposed in the shaft diameter die and the element pipe and is arranged in the shaft diameter die. And the groove forming step, wherein the groove forming step is rotatably connected to the floating plug in the element pipe, the groove forming plug having a plurality of grooves formed on an outer circumference thereof, and the element pipe on the outside of the element pipe. Inner surface performed with a pressing tool disposed revolving around the tube axis while pressing toward the groove-forming plug side A method for producing the formed pipe, the outer diameter of the base tube D ₀ (㎜), by a diameter D ₂ (㎜) of the shaft diameter of the _{die, R D = {(D 0} -D 2) / D 0} × 100 (%) the responsibility of the shaft diameter ratio R _D (%) of R _D is set to ≤30, and the outer diameter D ₁ of the floating plug (㎜), the diameter D ₂ (㎜) of the shaft diameter of the die represented by, D ₁ -D ₂ ≥ It is preferable to set it to 0.1.

As in the manufacturing method of the inner grooved tube, the shaft diameter of the element pipe is set to 30% or less in the shaft means, so that the so-called chattering phenomenon in which the element pipe is vibrated finely after being reduced by the shaft means is suppressed. With the drawing means (the auxiliary drawing means), it is possible to stabilize the load assistance that assists the drawing load.

Specifically, when the shaft diameter of the element pipe becomes larger than 30%, the contact area between the element pipe and the shaft die increases and the frictional resistance increases, so that the processing load in the shaft die becomes large, and the outer diameter of the tube passes through the outlet of the shaft die. An excessive tapering phenomenon that becomes thinner than the diameter occurs.

In addition, due to the excessive tapering phenomenon, the contact between the element pipe and the shaft die is not stable, and a chattering phenomenon tends to occur, resulting in a decrease in thickness. Since the vibration caused by the chattering phenomenon is transmitted to the intermediate drawing means, and the outer tube diameter is reduced due to the excessive tapering phenomenon, the pressing force against the element pipe of the pad provided for pressing the tube in the intermediate drawing means becomes unstable. As a result, the load assistance by the intermediate drawing means becomes unstable.

Therefore, in order to avoid such a problem at the time of processing, in this invention, the axial diameter rate of an element pipe is set to 30% or less in the said axial diameter means.

Further, the outer diameter D ₁ (㎜) of the floating plug, by setting the diameter D ₂ (㎜) of the die so that the shaft diameter D ₁ -D ₂ ≥0.1, it is possible to more effectively suppress the occurrence of chattering.

In detail, when the difference (D ₁ -D ₂ ) between the diameter of the floating plug and the shaft die is less than 0.1 mm, the area where the floating plug and the shaft die has overlap is small.

As described above, the area where the floating plug and the shaft diameter die overlap with each other decreases, so that when a small pipe is drawn in between, a non-taper on the upstream side of the corner of the floating plug, specifically, the outer peripheral surface of the floating plug. When the inner surface of the pipe is strongly in contact with the boundary between the surface and the tapered surface on the downstream side, the load on the floating plug becomes excessive, so that excessive tapering, vibration caused by chattering, thickness reduction, and intermediate drawing Load assist instability in the machine is more likely to occur.

Therefore, so that there is no such a problem at the time of processing, in the present invention, and is set to be D ₁ -D ₂ ≥0.1.

Moreover, as an aspect of this invention, the revolving direction of the said pressing tool is set to the direction opposite to the rotation direction of the said grooved plug (henceforth "reverse direction"), and the processing pitch P (mm) of the said pressing tool is set. It can be set to be in a range of 0.2≤P≤0.7.

According to the said structure, the inner surface grooved tube which has the groove with high processing precision can be manufactured stably.

When P is smaller than 0.2 mm, even if the load assistance by the said intermediate drawing means is enlarged, it is confirmed by experience that it becomes difficult to form a groove in an inner surface of an element pipe. On the other hand, if it is larger than 0.7 mm, the tensile load is not stabilized and the variation is large.

On the other hand, in order to stabilize the load assist by the intermediate drawing means more and improve the machining accuracy of the groove, the revolving direction of the pressing tool is set in the reverse direction, and the machining pitch P is set smaller in the range satisfying P≥0.2. It is better to do it.

Specifically, in a case where priority is given to the processing of increasing the processing accuracy of the grooves more than the productivity of the inner surface grooved tube, the processing pitch P may be set to, for example, 0.2 ≦ P ≦ 0.4 in a range of 0.2 ≦ P ≦ 0.7.

On the other hand, in order to increase the productivity of the inner grooved tube, it is better to set the revolving direction of the pressing tool in the reverse direction and set the machining pitch P large in a range satisfying P ≦ 0.7.

Specifically, in the case where the productivity of the inner surface grooved tube is prioritized over the process of further increasing the processing accuracy of the grooves, it is preferable to set the processing pitch P to 0.4 ≦ P ≦ 0.7, even in the range of 0.2 ≦ P ≦ 0.7.

Moreover, as an aspect of this invention, the revolving direction of the said pressing tool is set to the same direction as the rotation direction of the said grooved plug (henceforth a "forward direction"), and the processing pitch P (mm) of the said pressing tool is set. It can be set so that it may become a range of 0.2≤P≤0.4.

As described above, even when the revolving direction of the pressing tool is in the forward direction, by setting the machining pitch P (mm) so as to be in the range of 0.2 ≦ P ≦ 0.4, no recess occurs in the base of the inner surface pin, so that the groove depth It is possible to obtain a deep and high processing precision.

Specifically, in order to manufacture an inner groove forming tube having a deep groove on the inner surface of the tube, it is preferable that the revolving direction of the pressing tool is in the forward direction, but in the forward direction, a pin formed between the groove and the groove in the inner surface of the tube. The unfilled part of the material called a dent is likely to occur at the base of the. In addition, the larger the processing pitch P is, the easier it is to generate digging.

For this reason, in order to prevent a dent while forming a deep groove, it is preferable that the revolving direction of the said pressing tool is a positive direction, and 0.2 <= P <= 0.4.

On the other hand, in general, the thinner the tube is, the harder it is to form a pin, the easier it is to break, and the processing becomes difficult. However, the present invention can be applied regardless of the thickness of the tube, including a thin tube, The thinner the tube, the more effective the production conditions of the present invention.

Further, according to the present invention, since the inner surface shape is also stable over the entire length of the long pipe and can be processed without breaking, it can be applied regardless of the length of the element pipe, and the yield and productivity can be improved.

Moreover, the manufacturing apparatus of the inner surface grooved tube of this invention is equipped with the shaft diameter means which shrinks an element pipe, and the groove processing means which performs a groove process on the inner surface of the shaft diameter tube which was reduced in diameter.

As an aspect of the present invention, the shaft reduction means, the groove processing means, and a drawing means for drawing the grooved inner surface groove forming tube are provided in this order from an upstream side, and are provided between the shaft diameter means and the groove processing means. And an inner groove forming tube having a conveying auxiliary means for conveying the reduced diameter tube in a conveying direction toward the groove processing means, wherein the reduced diameter means and the conveying auxiliary means are fixed and the drawing direction of the drawing means. And a movable stage load detection device for detecting a load in the direction of the relative movement applied to the movable stage when the movable stage is relatively moved relative to the groove processing means in parallel with the groove processing means. It is preferable that it is a manufacturing apparatus of an inner surface grooved tube.

In addition, as an aspect of the present invention, the groove processing means is fixed and relatively movable relative to the drawing means in parallel with the drawing direction, and the relative movement of the relative movement applied to the expectation when the expectation is relatively moved relative to the drawing means. An anticipated load detecting device for detecting a load in a direction; and a control means for controlling an operation of the conveying auxiliary means, and the movable table is configured to be relatively movable in the drawing direction with respect to the base. Is based on the load detected by at least one of the moving table load detection device and the expected load detection device, a transport assist speed adjustment process for adjusting the transport assist speed of the transport assist means and a transport assist of the transport assist means. The phrase which performs at least one of the feed auxiliary torque adjustment processes which adjust torque. You can do it with your last name.

Moreover, as an aspect of this invention, in the said feed auxiliary speed adjustment process, the said feed auxiliary speed is made into a 1st feed auxiliary speed, and the said feed auxiliary torque adjustment process is decided based on the correlation with the said feed auxiliary torque. 2 can be adjusted to adjust with a feed assist speed.

Moreover, as an aspect of this invention, the intermediate drawing which has the said shaft diameter means and the said groove processing means, and draws the small pipe reduced by the said shaft diameter means between the said shaft diameter means and the said groove processing means along the drawing direction of an element pipe. And a means for reducing the diameter of the shaft, wherein the shaft diameter means comprises a shaft diameter die and a floating plug disposed in the element pipe, and the element pipe is reduced in diameter along with the axis diameter die, and the groove processing means is rotatable with the floating plug in the element pipe. A device for producing an inner grooved tube, comprising: a groove-forming plug connected to the outer periphery, and a pressing tool arranged to revolve around the tube axis while pressing the elementary pipe to the groove-forming plug side on the outside of the tube. as, with an outer diameter D ₀ (㎜), by a diameter D ₂ (㎜) of the shaft diameter of the _{die, R D = {(D 0} -D 2) / D 0} × 100 (%) of the base tube or The diameter D ₂ of the outer diameter D ₁ (㎜), the shaft diameter of the die of the floating plug setting, and the R _D ≤30 (㎜) according to the shaft diameter means, the shaft diameter ratio of the tube blank within eojineun R _D (%), _D It is preferable to set such that _1- D _2? 0.1.

As in the apparatus for producing the inner grooved tube, the shaft diameter of the element pipe is set to 30% or less in the shaft means, so that a so-called chattering phenomenon in which the element pipe is vibrated finely after being reduced by the shaft means is suppressed. With the drawing means, it is possible to stabilize the load assistance that assists the drawing load.

Specifically, when the shaft diameter of the element pipe becomes larger than 30%, the contact area between the element pipe and the shaft die increases and the frictional resistance increases, so that the processing load in the shaft die becomes large, and the outer diameter of the tube passes through the outlet of the shaft die. An excessive tapering phenomenon that becomes thinner than the diameter occurs.

In addition, due to the excessive tapering phenomenon, contact between the element pipe and the shaft die is not stable, and a chattering phenomenon tends to occur, resulting in a thickness reduction. Since the vibration caused by the chattering phenomenon is transmitted to the intermediate drawing means, and the outer tube diameter is reduced by the excessive tapering phenomenon, the pressing force against the element pipe of the pad provided to press the tube in the intermediate drawing means becomes unstable. As a result, the load assistance in the intermediate drawing means becomes unstable.

Therefore, in order to avoid such a problem at the time of a process, in this invention, the axial diameter rate of an element pipe is set to 30% or less in the said axial diameter means.

Further, by the outer diameter D ₁ (㎜), the diameter D ₂ of the shaft diameter of the die (㎜) of the floating plug, set to be D ₁ -D ₂ ≥0.1, it is possible to more effectively suppress the occurrence of chattering.

In detail, when the difference (D ₁ -D ₂ ) between the diameter of the floating plug and the shaft die is less than 0.1 mm, the area where the floating plug and the shaft die has overlap is small.

As described above, the area where the floating plug and the shaft diameter die overlap with each other decreases, so that when a small pipe is introduced therebetween, a corner portion of the floating plug, specifically, a non-tapered surface on the upstream side of the outer peripheral surface of the floating plug. When the inner surface of the pipe is strongly in contact with the boundary portion of the tapered surface on the downstream side, the load on the floating plug becomes excessive, so that excessive tapering, vibration caused by chattering, thickness reduction, and an intermediate drawing machine The load assist instability becomes more likely to occur.

Therefore, so that there is no such a problem at the time of processing, in the present invention, and is set to be D ₁ -D ₂ ≥0.1.

Moreover, as an aspect of this invention, the revolving direction of the said pressing tool is set to the direction opposite to the rotation direction of the said grooved plug (henceforth "reverse direction"), and the processing pitch P (mm) of the said pressing tool. Can be set to be in a range of 0.2≤P≤0.7.

According to the said structure, it becomes possible to manufacture stably the inner surface groove forming tube which has the groove with high processing precision.

When P is smaller than 0.2 mm, even if the load assistance by the said intermediate drawing means is enlarged, it is confirmed by experience that it becomes difficult to form a groove in an inner surface of an element pipe. On the other hand, if it is larger than 0.7 mm, the tensile load is not stabilized and the variation is large.

On the other hand, in order to stabilize the load assist by the intermediate drawing means more and improve the machining accuracy of the groove, the revolving direction of the pressing tool is set in the reverse direction, and the machining pitch P is within a range satisfying P≥0.2. It is better to set smaller.

Specifically, in a case where priority is given to the machining of raising the machining accuracy of the grooves more than the productivity of the inner grooved tube, the machining pitch P may be set to, for example, 0.2≤P≤0.4 within a range of 0.2≤P≤0.7. .

On the other hand, in order to increase the productivity of the inner grooved tube, it is better to set the revolving direction of the pressing tool in the reverse direction and set the machining pitch P large in a range satisfying P ≦ 0.7.

Specifically, in the case where the productivity of the inner surface grooved tube is prioritized over the process of increasing the machining accuracy of the groove, it is preferable to set the machining pitch P to 0.4 ≦ P ≦ 0.7, even in the range of 0.2 ≦ P ≦ 0.7. .

Moreover, as an aspect of this invention, the revolving direction of the said pressing tool is set to the same direction as the rotation direction of the said grooved plug (henceforth a "forward direction"), and the processing pitch P (mm) of the said pressing tool is set. It can be set so that it may become a range of 0.2≤P≤0.4.

As in the above configuration, even when the revolving direction of the pressing tool is in the forward direction, by setting the machining pitch P (mm) to be in the range of 0.2≤P≤0.4, no dents occur in the base of the inner surface pin, and the groove depth It is possible to obtain a deep and high processing precision.

Specifically, in order to manufacture an inner groove forming tube having a deep groove on the inner surface of the tube, it is preferable that the revolving direction of the pressing tool is in the forward direction, but in the forward direction, a pin formed between the groove and the groove in the inner surface of the tube. Unfilled portions of a material called digging are likely to form at the base of the. In addition, the larger the processing pitch P is, the easier it is to generate digging.

For this reason, in order to prevent dug while forming a deep groove, it is preferable that the revolving direction of the said pressing tool is a positive direction, and 0.2 <= P <= 0.4.

Further, in general, the thinner the tube is, the harder it is to form a pin, the easier it is to break, and the more difficult to process. However, the present invention can be applied regardless of the thickness of the tube, including a thin tube, The thinner the tube, the more effective the production conditions of the present invention.

In addition, according to the present invention, since the inner surface shape is stable over the entire length of the long pipe and can be processed without breaking, it can be applied regardless of the length of the element pipe, and the yield and productivity can be improved.

Moreover, as an aspect of this invention, the drawing means which draws the inner surface grooved tube which processed on the downstream of the pipe-axis direction downstream of the said groove processing means, and the pipe axis | shaft to the pipe-axis direction upstream rather than this drawing means by the drawing of a pipe It is preferable that it is a manufacturing apparatus of the inner surface grooved tube provided with the process related data detection means which detects the process related data regarding the process load which arises in a direction.

According to the above configuration, since the machining related data relating to the machining load occurring in the tube axis direction can be detected in accordance with the drawing of the element pipe, the groove processing means is provided even if the element pipe is broken upstream of the tube axis direction rather than the drawing means based on the machining related data. It can be recognized that a short pipe occurs before a grooved plug is broken.

Therefore, a countermeasure, such as stopping a device, can be quickly taken, and the groove forming plug can be directly pushed against the rolled ball in the groove forming means to prevent damage.

The processing related data is, for example, the processing load measured in the shaft diameter means or the groove processing means, or the drawing load of the intermediate drawing means (the auxiliary drawing means), in other words, the load related data related to the load (driving force) of the motor. For example. The processing-related data may be data such as a current value or a voltage value that electrically signals a processing load or a driving force, and a derivative value obtained by differentiating these values, and further, a waveform in which these data are graphed is shown. You may be inclined.

In addition, as an aspect of the present invention, the machining-related data detection means measures the machining load in the grooving load measuring means for measuring the machining load in the grooving means and the machining load in the shaft-measuring means. It can comprise at least one of a means.

When the said machining related data detection means is comprised by the said grooving load measuring means, it can be determined that a short pipe generate | occur | produced based on the change of the said machining load in the said grooving means.

When the said process related data detection means is comprised by the said diameter reduction process load measuring means, it can be determined that a short pipe | tube has generate | occur | produced based on the change of the said processing load in the said diameter reduction means.

For this reason, even when a regular diameter die is provided downstream of the groove processing means, the groove-forming plug is not affected by the delay of determination of short pipe generation in any of the groove processing means and the shaft diameter means. The occurrence of a short pipe can be recognized before the breakage occurs.

In particular, in the case where the machining related data detecting means is configured by the shaft diameter machining load measuring means, even when a short pipe occurs between the groove processing means and the shaft diameter means, the occurrence of the short pipe can be determined in an instant. Do.

Further, in any one of the grooving means and the shaft diameter means, for example, when the machining load changes to a predetermined ratio just before falling to a mechanical loss level, such as, for example, 20% with respect to the machining load during normal normal machining, a short pipe You can judge that.

In addition, as an aspect of the present invention, there is provided an intermediary drawing means for drawing element pipes between the shaft reduction means and the groove processing means, and the processing-related data detecting means relates to a load related to a drawing load of a motor of the intermediate drawing means. It is possible to comprise a load-related data detection means for detecting data.

By providing the intermediate drawing means, it is possible to assist the drawing of the element pipe by the drawing means, while the variation of the load on the shaft-reducing means and the groove processing becomes large, but the load detected by the load-related data detecting means. Based on the relevant data, it is possible to recognize that a short pipe has occurred, thereby preventing the grooved plug from being broken.

Moreover, since it is a structure used to detect the load related data related to the drawing load (load of a motor) of the said intermediate drawing means, and to recognize a short pipe generation, load measuring means, such as a load cell and a torque gauge, Furthermore, the said load measurement Since hardware, such as a jig for installing a means, becomes unnecessary, the short pipe detection can be easily performed using existing equipment.

In this case, since the drawing load itself of the intermediate drawing means is always changed during processing by control, it may be difficult to recognize the occurrence of short pipes, but even in that case, the derivative value or the differential value of the drawing load is used as the load-related data. This is preferable in view of the fact that marked fluctuations in the occurrence of short pipes can be reliably recognized.

In the case of using the derivative value of the drawing load as the load-related data, in the above-described single pipe determination means, for example, the derivative value of the drawing load is five times the standard deviation σ in the distribution due to the variation in the degree of occurrence even in normal normal processing. If it fluctuates significantly beyond a predetermined width, such as (5σ), it can be determined as a short pipe.

As the load-related data, as described above, data such as a drawing load (motor load), a current value corresponding to the load, a voltage value (electrical signal), differential values of these data, differential values, and the like can be exemplified.

Further, the load-related data is not limited to the load of the motor, and may be the torque of the motor, and in addition, the (angular) speed of the transmission mechanism such as a pulley and a belt that is driven by the load of the motor of the intermediate tracking means. , (Angular) acceleration, or these derivatives, and the data are not particularly limited as long as they are data related to the load of the motor of the intermediate drawing means.

Moreover, as an aspect of this invention, the short pipe | tube determination means which judges that short pipe generate | occur | produced based on the said process related data detected by the said process related data detection means can be provided.

Since the short pipe determination means can automatically determine that the short pipe has occurred based on the processing related data detected by the processing related data detection means, the device can be stopped immediately and reliably when it is determined that the short pipe has occurred. Thereby, the breakage of the groove-forming plug can be prevented.

Moreover, this invention determines that a short pipe generate | occur | produced by the said short pipe determination means based on the said processing related data detected by the said processing related data detection means using the manufacturing apparatus of the said inner surface grooved pipe, and it processes It is a manufacturing method of the inner surface grooved tube which stops, It is characterized by the above-mentioned.

According to the above configuration, it is automatically determined that a short pipe has occurred on the basis of the processing related data detected by the processing related data detecting means, and if it is determined that the short pipe has occurred, processing is performed before the grooved plug provided in the groove processing means is broken. Since it can stop, damage to a grooved plug can be prevented reliably.

Industrial Applicability The present invention provides an inner grooved tube which is excellent in heat conduction performance, can be miniaturized and reduced in weight, and can realize resource saving, and a manufacturing method capable of efficiently and stably manufacturing such inner grooved tube. A manufacturing apparatus can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the manufacturing apparatus of the inner surface grooved tube of Embodiment 1. FIG.
FIG. 2 is a cross-sectional view showing a part of the inner surface grooved tube of Embodiment 1 cut at right angles to the tube axis; FIG.
3 is a cross-sectional view taken along a tube axis of the inner grooved tube of Embodiment 1. FIG.
4 is a configuration diagram showing a configuration of an inner surface grooved tube manufacturing apparatus of Embodiment 2. FIG.
5 is an explanatory diagram for explaining a load and a force in the inner grooved tube manufacturing apparatus of the second embodiment;
FIG. 6 is a flowchart showing the overall operation of the inner grooved tube manufacturing apparatus of Embodiment 2. FIG.
FIG. 7 is a cross-sectional view showing an apparatus for manufacturing an inner grooved tube of Embodiment 3. FIG.
FIG. 8 is an explanatory diagram of the configuration of the shaft reduction means in which the shaft reduction means of the third embodiment is shown in partial cross section; FIG.
FIG. 9 is an operation explanatory diagram showing a state in which the tube is reduced in diameter by the reduction means of the third embodiment; FIG.
10 is an explanatory diagram illustrating a processing pitch of a processing ball of Embodiment 3;
FIG. 11 is a cross-sectional view showing a portion of the inner surface of the tube having a pin having a dent generated; FIG.
12 is an explanatory diagram showing a state in which the tube is reduced in diameter by conventional shaft reduction means;
FIG. 13 is a cross-sectional view showing an apparatus for manufacturing an inner grooved tube of Embodiment 4A. FIG.
14 is a cross-sectional view showing an apparatus for manufacturing an inner grooved tube of Embodiment 4B.
15 is a cross-sectional view showing an apparatus for producing an inner grooved tube of Embodiment 4C.
FIG. 16 is a cross-sectional view illustrating an installation site of a processing load detection unit provided in each of the embodiments 4A, 4B, and the prior art manufacturing apparatus. FIG.
FIG. 17 is a cross-sectional view illustrating a mounting portion of a processing load detection unit installed in a manufacturing apparatus of Embodiment 4C. FIG.
Fig. 18 is a graph showing changes in processing related data before and after short pipe generation in a state of short pipe generation determination in a manufacturing apparatus of a comparative example.
Fig. 19 is a graph showing the state of the short pipe generation determination in the manufacturing apparatus of the comparative example in a graph of the variation of processing related data before and after the short pipe generation.
Fig. 20 is a graph showing changes in processing related data before and after short pipe generation in a state of short pipe generation determination in a manufacturing apparatus of a comparative example.
Fig. 21 is a graph showing the state of the short pipe generation determination in the manufacturing apparatus of the comparative example in a graph of the variation in processing related data before and after the short pipe generation.
Fig. 22 is a graph showing the state of the short pipe generation determination in the manufacturing apparatus of Embodiment 4A in a graph of the variation in processing related data before and after the short pipe generation.
FIG. 23 is a graph showing the state of the short pipe generation determination in the manufacturing apparatus of Embodiment 4A, graphically illustrating the variation in processing-related data before and after short pipe generation. FIG.
FIG. 24 is a graph showing the state of the short pipe generation determination in the manufacturing apparatus of Embodiment 4A, graphically illustrating the variation in processing-related data before and after short pipe generation. FIG.
FIG. 25 is a graph showing the state of the short pipe generation determination in the manufacturing apparatus of Embodiment 4B, graphically illustrating the variation in processing-related data before and after short pipe generation. FIG.
FIG. 26 is a graph showing changes in processing related data before and after short pipe generation, showing a state of short pipe generation determination in the manufacturing apparatus of Embodiment 4B; FIG.
Fig. 27 is a graph showing the state of the short pipe generation determination in the manufacturing apparatus of Embodiment 4C in a graph of the variation in processing related data before and after the short pipe generation.
FIG. 28 is a graph showing changes in processing related data before and after short pipe generation, showing a state of short pipe generation determination in the manufacturing apparatus of Embodiment 4C; FIG.
Fig. 29 is a graph showing the state of the short pipe generation determination in the manufacturing apparatus of Embodiment 4C in a graph of the variation in processing related data before and after the short pipe generation.

(Embodiment 1)

One embodiment of this invention is described with drawing below.

The manufacturing method of the inner surface grooved tube 11 in this embodiment can be manufactured using the manufacturing apparatus 12 as shown in FIG.

FIG. 1: is explanatory drawing of the manufacturing apparatus 12 of the inner surface grooved tube in this embodiment.

The said manufacturing apparatus 12 is an axis diameter part 13, the auxiliary drawing apparatus 17, and the grooving part 14 in order along the downstream from the upstream side of a drawing direction (drawing direction) (X direction in FIG. 1). ), The finishing processing part 15 is arrange | positioned, and further, the drawing apparatus 16 is provided further downstream, The internal pipe | tube 11a is manufactured by continuously processing the element pipe 11a by these structures.

Specifically, the manufacturing apparatus 12 includes an axis diameter portion 13 for drawing and shrinking the element pipe 11a, a groove processing portion 14 for forming a plurality of grooves in the inner surface of the element pipe 11a, and this groove. Between the drawing device 16 which also serves as a winding drum 36 which winds up the inner surface groove forming tube 11 which has been processed on the downstream side of the processing part 14, between the shaft diameter part 13 and the groove processing part 14. It consists of the auxiliary drawing apparatus 17 which draws out the primary pipe | tube 11a.

Moreover, the said manufacturing apparatus 12 is movable to support the shaft-diameter 13, the auxiliary drawing apparatus 17, and the grooved part 14 so that the manufacturing apparatus 12 can move to the drawing stand 50 in the drawing direction. By the load cell 35 and the load cell 35 which detects the processing load P which acts according to the movement of the movable table 33 with respect to the said fixed base 50, and this load cell 35, It is comprised by the control apparatus 45 which controls the auxiliary drawing apparatus 17 based on the detected process load P. FIG.

Hereinafter, the structure of each part mentioned above is demonstrated.

The said shaft diameter part 13 is comprised by the cylindrical dice 22 for shaft-axising the small pipe 11a which passes. The die 22 has a die hole 22a opened in a shape in which the tip gradually widens toward the upstream side.

Moreover, the said shaft diameter part 13 is equipped with the floating plug 23 inside the element pipe 11a. The floating plug 23 has a conical shape in the axial direction of the outer circumferential surface so as to be able to engage with the die 22 with the small pipe 11a interposed therebetween. As a result, the floating plug 23 is rotatably coupled to the die 22.

Moreover, the said groove processing part 14 is provided with the groove formation plug 24 in which the some helical groove was formed in the outer periphery inside the element pipe 11a.

The groove-forming plug 24 and the floating plug 23 are connected to each other independently through a connecting rod 25 so as to be rotatable. In addition, the groove processing portion 14 is provided with a plurality of balls 26, and the plurality of balls 26 are rotated around the tube axis while pressing the element pipe 11a outside the element pipe 11a. It is arrange | positioned as possible.

In the groove processing portion 14, the groove forming plug 24 is in contact with the inner circumferential surface of the element pipe 11a, the element pipe 11a is tensioned in the drawing direction while rotating about the axis, and is pressed by a plurality of balls 26. As a result, a plurality of parallel spiral grooves can be formed on the inner circumferential surface of the element pipe 11a.

By passing through the groove processing portion 14, the inner surface groove forming tube 11 can be obtained.

The finishing die 15 is provided with a regular die 27, and an inner surface groove forming tube 11 passes through the die hole 27a of the regular die 27, for example, the groove processed part 14. The process of smoothly correcting the distortion of the pipe surface etc. which occurred by the press of the ball 26 in the () is performed.

The drawing device 16 includes a winding drum 36 and a winding motor M1, and winding the drum 36 while tensioning the inner surface groove forming tube 11 by rotational driving of the motor M1. Closed.

The auxiliary drawing device 17 assists the drawing by the drawing device 16 by drawing the element pipe 11a in the drawing direction between the shaft diameter portion 13 and the groove processing portion 14. That is, the grooving by the grooving part 14 becomes a resistance when drawing the element pipe 11a, and the load of the gull at the time of grooving increases, but the grooving ( The drawing load on 11a) can be distributed.

The auxiliary drawing device 17 is provided with a pair of belts 42a and 42b arranged on each of the upper and lower sides, or the left and right sides of the tube 11a. Each of the belts 42a and 42b is formed in a loop shape (endless type) and spans the pulley 43 so as to be rotatable by the rotational drive of the motor M2. The belts 42a and 42b are formed in a caterpillar manner in which a plurality of pads 44 are extended to the outer circumferential surface along the longitudinal direction thereof.

The pair of belts 42a and 42b in the auxiliary drawing device 17 are used to provide a sufficient pulling force and prevent deformation of the elemental pipe 11a. The pressing force is provided on each side with respect to the element pipe 11a so that the pressing force may be maintained at a desired pressing force of 0.3 MPa, for example.

Although not shown, the pad 44 has a cut surface with respect to the direction in which the plurality of pads 44 extend in contact with the outer surface of the element pipe 11a after being reduced by the shaft diameter portion 13. An arc-shaped pad groove 44a is formed.

On the other hand, an upstream side of the auxiliary drawing device 17 may be provided with a wiper for removing oil film or foreign matter adhering to the outer surface of the element pipe 11a (not shown).

The movable table 33 is provided on the fixing table 50 via a plurality of wheels 33a so that the movable table 33 can be moved in parallel with the fixing table 50 in the drawing direction or the reverse direction thereof, and the aforementioned shaft diameter portion 13 and the groove are described above. The processing part 14, the finishing processing part 15, and the auxiliary drawing apparatus 17 are provided in the state which accommodated in the box 32. As shown in FIG.

The load cell 35 detects the processing load P received from the movable table 33 according to the pulling force of the element pipe 11a on the downstream side end portion of the movable table 33 on the fixed table 50. It is installed so that it can be done.

As for the said control apparatus 45, the load detection signal S _in which the electrical signal of the processing load P detected by the load cell 35 is input, and the motor of the auxiliary drawing apparatus 17 according to a control program. (M2) Outputs a control signal S _out for controlling driving.

Although not shown, the control device 45 temporarily stores an arithmetic unit (CPU) for executing signal analysis and arithmetic processing, a hard disk for storing necessary control programs, and the load detection signal S _in . In addition, it is possible to appropriately include an input means such as a keyboard for inputting control parameters, and display means such as a monitor.

The manufacturing method of the inner surface grooved tube 11 in this embodiment is performed using the manufacturing apparatus 12 of the inner surface grooved tube mentioned above.

Specifically, the manufacturing method of the inner surface grooved tube 11 in this embodiment is a primary finishing tube, when the inner surface grooved tube 11 after passing the diameter die 27 is a primary finishing tube. When the axial cross-sectional area of is A _C1 (mm2) and the breaking stress of the primary finish tube is σ _M (N / mm2), the processing load (P) is between 0.5 and 0.9 times (A _C1 × σ _M ). By controlling the speed of the motor M2 of the auxiliary drawing apparatus 17 so that it may become, it is a method of manufacturing the primary finishing pipe of a desired shape.

Thus, controlling so that the range of the speed of the motor (M2) of the auxiliary drawing unit (17), P≥0.5 × (A C1 × σ M), P is _{<0.5 × (A C1 × σ} M), This is because the inner surface of the tube tends to change due to slight fluctuations in the driving force of the auxiliary drawing device 17, and the groove depth and the like become inconsistent.

Controlling the speed of the motor (M2) of the auxiliary drawing unit (17) such that the range of _{P≤0.9 × (A C1 × σ M} ), if _{P> 0.9 × (A C1 ×} σ M), in the small tube This is because the pipe breaks due to fluctuation in thickness or fluctuation in pulling force.

By the manufacturing method of the above-mentioned inner surface grooved tube 11, as shown in FIG.2 and FIG.3, the range whose outer diameter D is 3 mm or more and 6 mm or less, and the depth H of the groove 2 are 0.07 mm or more and in the range of 0.10 mm to 0.30 mm, the torsion angle β of the groove 2 with respect to the center axis of the tube is in the range of 30 to 60 degrees, formed between the adjacent grooves 2 and the grooves 2 When the apex angle α of the pin 1 to be used is in the range of 5 degrees to 20 degrees, and the cross-sectional area of the tube in the axial direction is A _C1 (mm 2), the inner groove-forming tube 11 having A _C1 <0.8 × D Can be prepared.

On the other hand, A _C1 <0.8 × D indicates that the tube is thinner than the conventional one.

This assumes that the average thickness at the time of removing the grooves 2 evenly without changing the cross-sectional area is t'mm. In the case where the thickness is sufficiently thin, the relationship of A _C ≒ πDt 'is established. This is because, in order to realize a thin film, for example, t '<0.255, the cross-sectional area needs to satisfy a relationship of A < _C × 0.8 × D as described above.

In addition, when the thickness of the tube is thin as compared with the conventional case, such as A _C <0.8 x D, processing becomes difficult. This is not only because the breaking load decreases by simply decreasing the cross-sectional area, but also because there is a problem peculiar to the groove forming process as follows.

That is, when the thickness becomes thin, the tube wall tends to buckle in the revolving direction of the ball, and before the part of the tube wall is filled in the grooves of the plug, the material constituting the tube slips outward in the radial direction.

In particular, in the conventional processing, the load applied in the drawing direction of the tube increases, but as the tensile force in the axial direction increases in this way, the deformation in the circumferential direction becomes difficult and the groove processing becomes difficult.

On the other hand, according to the manufacturing method of the inner surface grooved tube 11 mentioned above, even if the load in the drawing direction applied to a tube is reduced by the above-mentioned control, even when groove-forming process is carried out with respect to a thin tube, Buckling in the direction can be suppressed.

As described above, the inner surface grooved tube 11 can have a larger groove depth, a larger torsion angle, and a smaller vertex angle than the prior art, and can be a heat transfer tube having a high heat transfer performance. In addition, by reducing the cross-sectional area, it is possible to obtain a heat transfer tube that is light in weight and resource-saving. In addition, by using such a high performance and lightweight heat transfer tube, the heat exchanger can be made compact and lightweight.

In the above-described embodiment, the method of controlling the speed of the motor M2 of the auxiliary drawing device 17 by the control device has been described. However, the method is not limited to controlling the speed as a control parameter. The acceleration, torque, rotation angle, or a plurality of them of M2) may be controlled as control parameters.

In addition, although the example which attached one motor M2 to the drive of the said auxiliary drawing apparatus 17 is shown in FIG. 1, you may drive by two by mounting a motor in each of left and right.

In this case, using a motor capable of following the target operation control value, such as a servo device, the processing load P at the time of processing the inner surface grooved tube having a difficult-to-break shape like the present invention is more It becomes possible to control in detail, and is effective for stabilization of plant operation.

Furthermore, the manufacturing method of this invention should just be a method of controlling the auxiliary drawing apparatus 17 at least, for example, so that P may be between 0.5 times and 0.9 times (A _C1x (s) _M ), for example, the auxiliary drawing apparatus 17 ) And the drawing device 16 may be controlled.

Next, the performance comparison experiment performed about the inner surface grooved pipe 11 comprised by the said method is demonstrated.

First, each said pipe | tube 11a was hanged on the inner surface groove processing apparatus on the conditions shown below, and the processing experiment which produced the primary finishing tube as an inner surface groove forming tube was performed.

In this experiment, outer diameter (D), number of grooves, bottom thickness (t), groove depth (H), torsion angle (β), vertex angle (α), groove bottom width (W ₁ ), mountain bottom width (W) ₂ ), Example 1 as shown in Table 1 below, with the ratio of the groove bottom width W ₁ to the groove depth H and the cross-sectional area A _C1 (see FIG. 2) in the axial direction as parameters. And the inner surface grooved tube 11 of 2 and the comparative control of these, the manufacture of the inner surface grooved tube of Comparative Examples 1-4 was tried.

Specifically, for each of Examples 1 and 2 and Comparative Examples 1 to 4, a plurality of copper pipes (small pipes 11a) having an outer diameter of 8 mm and a smooth inner surface were prepared as processing raw materials, and continuous 1000 m or more were prepared. The target machining was carried out five times, and a machining yield experiment was performed to compare the number of times that machining could be performed 1000 m or more without breaking.

In Examples 1 and 2, the processing load P was 0.5 × (A _C1 × σ _M ) ≦ P ≦ 0.9 ×, which was performed by the above-described processing method of the present invention, that is, using the manufacturing apparatus 12 described above. It is manufactured by the processing method of controlling the speed of the motor M2 of the auxiliary drawing apparatus 17 so that it may become ( _AC1 * (sigma) _M ).

On the other hand, in Examples 1 and 2, experiment is performed by setting target drawing load to 1200N and 700N, respectively.

On the other hand, in the comparative examples 1 and 2, although the process is performed using the manufacturing apparatus 12 mentioned above, the processing load P is manufactured by setting out of the conditions of this invention.

On the other hand, in Comparative Examples 1 and 2, the target drawing load was set to 1250 N and 600 N, respectively, to perform the experiment.

In the comparative examples 3 and 4, it is performed by the manufacturing method of the inner surface grooved tube disclosed by the said patent document 3 (Unexamined-Japanese-Patent No. 2001-241877). That is, in the comparative examples 3 and 4, it does not provide the auxiliary drawing apparatus 17, but manufactures using the manufacturing apparatus which draws the small pipe | tube 11a only with a drawing apparatus.

In each of Examples 1 and 2 and Comparative Examples 1 to 4, the results of machining experiments of the primary finish tubes are shown in Table 1.

As can be seen from these results, in Examples 1 and 2, by controlling P to 0.5 times to 0.9 times of (A _C1 × σ _M ) using the apparatus configuration 12 of the present invention, either In five of five tests, it could process stably with the inner surface grooved pipe of the shape as shown in Table 1.

On the other hand, when the vertex angle of a primary finishing tube is smaller than 16 degree | times, it is necessary to form the groove | channel of the grooved plug 24 thinly, and the thin groove of this grooved plug 24 can reliably fill a pipe thickness part. Since it is not present, processing becomes difficult.

Therefore, as in Examples 1 and 2, it can be said that the manufacturing method of the present invention which can process the vertex angle to 16 degrees is particularly effective.

On the other hand, in the comparative examples 1 and 2, what was able to process without a problem during five times of processing was three times and once, respectively, and the yield fell all. From this result, when the range of the processing load P deviated from the conditions of this invention, it became clear that processing stability fell, and the effectiveness of the manufacturing method of this invention was demonstrated.

In the comparative example 3, although it could process without breaking all five times, for example, the outer diameter D is 8 mm larger than 6 mm, the vertex angle alpha is 23 degrees larger than 20 degrees, and the cross-sectional area with respect to the axial direction ( A _C1 ) became 7.6 mm 2, which is larger than 0.8D, and the shapes of the present invention as in Examples 1 and 2 were not obtained.

In Comparative Example 4, using the same manufacturing apparatus as Comparative Example 3, in particular, the outer diameter D tried to be processed to the same 6 mm as Examples 1 and 2, but was able to be processed without problems during five times of processing 0 As soon as the circuits started processing, they all broke, making it impossible to continue processing.

Subsequently, the primary finishing tubes of Examples 1, 2, and Comparative Example 3 obtained in the above-described machining experiment were each sinked by a sinking die (not shown) to obtain a heat transfer tube as a final finished tube having a desired outer diameter. The experiment was conducted.

Specifically, the sinking is to pull the primary finishing pipe through a die without directly processing the inner surface of the primary finishing pipe. The outside diameter decreases and the thickness slightly decreases due to the sinking. In addition, as it extends in the longitudinal direction, the torsion angle decreases.

On the other hand, in general, the sinking is not performed if the primary finish tube is the desired outer diameter, but is larger than the desired outer diameter, and the sinking is a process performed for the primary finish tube. A sinking machining experiment was conducted for 1 or 2 and Comparative Example 3.

Thereby, the heat exchanger tube of Example 3 and the comparative example 5 which are shown in following Table 2 can be manufactured.

On the other hand, Example 3 sinks the primary finishing tube of Example 1 or 2, and reduces the outer diameter to 5 mm. In Comparative Example 5, the primary finishing tube of Comparative Example 3 was sinked and reduced in diameter to 7 mm in outer diameter.

Here, in the primary finishing pipe and the final finishing pipe after sinking, the ratio of the outer diameter and the cross-sectional area does not exactly match, but in the implementation range, the axial diameter ratio (reduction rate of the outer diameter) of the sinking is about 10 to 20%, and in this range. Inside, it is A _C1 / D ₁ ≒ A _C / D.

On the other hand, A _C1 , D ₁ each represent a cross-sectional area and an outer diameter in the axial direction of the primary finishing tube, and A _C and D each represent a cross-sectional area and an outer diameter in the axial direction of the final finishing tube.

As can be seen from Table 2, in Example 3, the outer diameter D is 5 mm with 3 mm or more and 6 mm or less, and the depth H of the grooves 2 is 0.17 mm with a depth H of 0.07 mm or more and 0.10 mm to 0.30 mm. , The torsion angle β of the groove 2 with respect to the central axis of the tube is 40 to 30 degrees to 60 degrees, the vertex angle α of the fin 1 formed between the adjacent groove 2 and the groove (2) A heat transfer tube having a desired shape satisfying the conditions of the present invention after sinking is 10 degrees, which is 5 degrees to 20 degrees and has a cross-sectional area (A _C ) in the axial direction of the tube smaller than 0.8 times the outer diameter (D). Could get

On the other hand, Comparative Example 5 is a sinking of Comparative Example 3 as the primary finishing tube as described above, for example, even if sinking Comparative Example 3 that deviates from the desired shape, such as A _C1 > 0.8 D _{1 to} a desired shape It could not be processed (A _C > 0.8D as it was).

This is because, if the axial shrinkage due to sinking is too large, the torsion angle becomes small, or the pin 1 is broken, and the axial shrinkage that can be reduced by sinking is limited.

In addition, in Example 3 and Comparative Example 5, as shown in Table 2, the heat transfer performance was also evaluated. The heat transfer performance of Example 3 is shown by the relative heat transfer performance at the time of setting the value of the heat transfer rate of the condensation tube heat resistance of the comparative example 5.

The heat transfer rate in the condensation tube used for calculation of heat transfer performance is measured by the following measuring methods.

Each of the sample tubes is inserted as an inner tube of a double tube heat exchanger sample provided horizontally, and the refrigerant (R410a) flows into these samples, and the cooling water flows into the double tube portion between the outer tube and the inner tube so as to counter flow with the refrigerant. The refrigerant was cooled by heat exchange with cooling water and refrigerant.

From the heat exchange amount at this time, the tube heat resistance (condensation heat) transfer rate at a mass flow rate of 300 kg / m 2 sec of the refrigerant was measured (measured on the basis of the tube outer surface).

As shown in Table 2, in Example 3 of this invention, it became 137 and the heat transfer performance higher than the comparative example 5 was obtained.

On the other hand, since the heat transfer rate in the condensation tube also depends on the diameter, Example 3 and Comparative Example 5 should compare and evaluate the heat transfer performance between the same diameter, but, as described above, Comparative Example 5 (ie, Comparative Example 3). In the manufacturing method of (4), since the small diameter pipe whose outer diameter (D) like this invention is 6 mm or less cannot be manufactured, Table 2 has shown the heat transfer performance compared with the pipe of different diameter.

Finally, by the above-mentioned manufacturing method of the present invention, Examples 4 to 8 as shown in Table 3 are manufactured as the final finishing tube, and the method for producing the inner grooved tube of the present invention is based on these Examples 4 to 8. Was validated.

On the other hand, Example 6 uses the thing which sinked the primary finishing tube of Example 1 or 2.

As shown in Table 3, Examples 4-8 were all made into the desired shape which satisfy | fills the range of the inner surface grooved pipe 11 of this invention mentioned above, and it could process with high yield.

From the results in Table 3, according to the manufacturing method of the present invention, an inner groove having a desired shape satisfying the range of the inner groove forming tube 11 of the present invention having a larger groove depth, a greater torsion angle, and a smaller vertex angle than the prior art. The formation pipe 11 could be manufactured, and it could demonstrate that the heat exchanger tube with a large heat transfer performance can be manufactured.

In addition, by reducing the cross-sectional area, it is possible to reduce the weight and save resources. This is most suitable for the heat exchanger of heat pump equipment, such as an air conditioner and a hot water heater, and is a high performance heat exchanger tube.

On the other hand, in the above-described performance evaluation experiment, although sinking was performed after the primary finishing tube was produced, the inner grooved tube of the present invention is not limited to the form in which the sinking is used as a product. It also includes the form to commercialize in shape.

In addition, in correspondence with Embodiment 1 mentioned above and the structure of this invention, the shaft diameter part 13 of this embodiment corresponds to the shaft diameter means of this invention,

The groove processing portion 14 corresponds to the groove processing means,

The drawing device 16 corresponds to drawing means,

The auxiliary drawing device 17 corresponds to the auxiliary drawing means,

The movable table 33 corresponds to the movable means,

The load cell 35 corresponds to the load detecting means,

The control device 45 corresponds to the control means,

Fixture 50 corresponds to the installation portion,

Although the primary finishing tube or the final finishing tube corresponds to the tube after passing through the grooving means, the present invention is not limited to the configuration of Embodiment 1, but can be implemented in many embodiments.

(Embodiment 2)

Next, the manufacturing apparatus 101 and manufacturing method of the inner surface grooved tube of Embodiment 2 are demonstrated.

The manufacturing apparatus 101 of an inner surface grooved pipe | tube is a groove processing apparatus which grooves the inner diameter of the reduction diameter device 120 which reduces the small pipe 201 which is the process target 200, and the reduced diameter diameter pipe 202. 140 and the winding drum 160 which draws out the grooved inner surface groove forming pipe 204 are provided in this order from an upstream side.

On the other hand, the auxiliary conveying apparatus 130 which conveys and assists the shaft diameter pipe 202 to the conveyance direction toward the groove processing apparatus 140 is provided between the shaft reduction apparatus 120 and the groove processing apparatus 140.

In addition, in the manufacturing apparatus 101 of the inner surface grooved tube, the shaft reduction apparatus 120 and the auxiliary conveying apparatus 130 are fixed and move relative to the groove processing apparatus 140 in parallel with the drawing direction of the winding drum 160. The upstream movable stand 182 which is possible is provided, and the upstream load detector 192 which detects the load of the relative moving direction which the upstream movable stand 182 applies when the upstream movable stand 182 moves relative with respect to the grooving apparatus 140. ).

Moreover, the manufacturing apparatus 101 of an inner surface grooved tube is equipped with the whole movable stand 184 which the grooving apparatus 140 is fixed and which can move relatively with respect to the winding drum 160 in parallel with a drawing direction. On the other hand, the upstream movable stand 182 is comprised so that relative movement is possible with respect to the whole movable stand 184 in the drawing direction.

Moreover, when the whole movable stand 184 moves relative with respect to the winding drum 160, the whole load detector 194 which detects the load of the relative moving direction which apply | hangs to the whole movable stand 184 is provided.

Moreover, the manufacturing apparatus 101 of an inner surface grooved tube is equipped with the controller 171 and the calculator 176 which control the operation | movement of the auxiliary feeder 130. As shown in FIG. The controller 171 and the calculator 176 adjust the feed assist speed of the subsidiary feed device 130 based on the load detected by at least one of the upstream load detector 192 and the total load detector 194. At least one of the feed auxiliary speed adjustment process and the feed auxiliary torque adjustment process for adjusting the feed auxiliary torque of the auxiliary feed device 130 are performed.

On the other hand, the feed assist speed executed by the controller 171 and the calculator 176 in the assist speed adjustment process is the first feed assist speed, and in the feed assist torque adjustment process executed by the controller 171 and the calculator 176, It adjusts with the 2nd feed assistance speed determined based on the correlation with a feed assistance torque.

In more detail, the controller 171 and the calculator 176 are a feed assist speed adjustment process for adjusting the feed assist speed of the auxiliary feed device 130 and a feed assist torque for adjusting the feed assist torque of the auxiliary feed device 130. At least one of the torque adjustment processes is adjusted based on the difference between the loads detected by the upstream load detector 192 and the entire load detector 194.

(Example 9)

One embodiment of this invention is described with drawing below.

FIG. 4: is a block diagram which shows the structure of the manufacturing apparatus 101 of the inner surface grooved tube of Embodiment 2. As shown in FIG. In FIG. 4, the apparatus used for a process, the apparatus used for sensing, and the apparatus used for control are shown. 5 is explanatory drawing explaining the load applied to a raw material, the drawing force and auxiliary feed force used for a process, and the load to detect in the manufacturing apparatus 101 of an inner surface grooved tube.

When the apparatus used for a process is demonstrated, the shaft diameter apparatus 120, the auxiliary feed apparatus 130, the groove processing apparatus 140, and the finishing apparatus 150 are each processed part horizontally and a straight line from the upstream to the downstream. It is arrange | positioned in this order so that it may become, and the winding drum 160 which draws and winds up the element pipe 201 in a straight line is provided downstream. The material of the element pipe 201 which is a process target can be made into the metal excellent in thermal conductivity, such as copper, aluminum, or these alloys, for example.

The shaft reduction device 120 includes an axis diameter die 121 for pressing the cylindrical element pipe 201 supplied from the upstream side inward around the element pipe 201, and a floating plug 111 disposed inside the element pipe 201. It is a device that is reduced in diameter through the gap.

The shaft diameter die 121 is provided with a die hole 122 in which a mortar-shaped slope is formed in which the tip gradually widens toward the upstream side. The floating plug 111 is larger in size than the minimum radius of the die hole 122 and is formed in a size slightly smaller than the inner circumferential size of the small pipe 201 and is inserted into the small pipe 201 in a free state. For this reason, when the element pipe 201 is pulled out while being reduced in diameter by the die hole 122 of the shaft diameter die 121, the floating plug 111 is not pulled out together.

Moreover, the opposing surface of the floating plug 111 with the die hole 122 is formed in the inclined surface of the truncated cone shape. Thereby, the outer peripheral surface is pressed by the die hole 122, and the inner surface of the small pipe 201 which is reduced in diameter can be pressed, and shaft diameter processing can be stabilized.

The element pipe 201 supplied from an upstream side is reduced in this shaft diameter device 120, and becomes the shaft diameter pipe 202. As shown in FIG.

At the time of this diameter reduction, the element pipe 201 is loaded with the shaft pull-out load R3 as shown in FIG. 5.

The auxiliary conveying apparatus 130 is comprised by the pressing apparatus 131, the attachment plate 132, the pulley 133, and the belt 134. As shown in FIG.

The pressing device 131 presses the attachment plate 132 th belt 134 toward the shaft pipe 202 (see FIG. 4).

The attachment plate 132 is attached to the upstream machine frame 102 so as to be movable up and down (movably in the direction perpendicular to the drawing direction) and rotatably supports a pair of pulleys 133 which are arranged in the drawing direction. Doing. In this pair of pulleys 133, the endless belt 134 hangs loosely, and the belt 134 is rotated by the driving force of the motor M2 which is a vector motor.

The belt 134 is formed in an endless loop shape, and a plurality of pads 135 are continuously arranged on the outer circumference. The pad 135 is preferably made of a harder material than the element pipe 201, and is formed of, for example, tool steel.

The attachment plate 132 provided with this pulley 133 and the belt 134 is provided in up-down symmetry (symmetrically in a direction perpendicular to the drawing direction) with the shaft diameter pipe 202 interposed. In addition, the pressing device 131 is also provided symmetrically. As a result, the upper and lower pressing device 131 presses the upper and lower belts 134 toward the shaft pipe 202 to sandwich the shaft pipe 202 between the pads 135.

The subsidiary conveying apparatus 130 performs the subsidiary conveying operation by this structure and the control of the controller 171. FIG. In other words, the pressing device 131 grips the shaft pipe 202 with the pad 135 at the top and bottom with a constant pressure at which the shaft pipe 202 is not excessively deformed. Then, the pulley 133 rotates at a maintenance rate by the rotational drive of the motor M2 under the control of the controller 171, and the belt 134 rotates accordingly so that the pad 135 and the shaft tube 202 may be rotated. The feed friction force in the material traveling direction (drawing direction) is generated in between.

At the time of conveyance assistance by this conveying frictional force, the auxiliary conveying apparatus 130 can apply the auxiliary conveying force F2, ie, an auxiliary conveying torque, to the shaft diameter tube 202, as shown in FIG. For this reason, the speed in the conveyance direction of the pad 135 becomes the speed more than or equal to the winding speed of the winding drum 160. FIG.

The groove processing apparatus 140 is provided with the groove formation plug 113, the process head 141, the rolling tool 142, the press member 143, and the bearing 144. As shown in FIG.

The groove-forming plug 113 is inserted into the shaft pipe 202 in a free state, and is rotatably connected to the floating plug 111 described above by the connecting rod 112. Thereby, it is comprised so that the position in the drawing direction of the groove formation plug 113 may not be reversed.

The processing head 141 is formed with a conical surface that gradually extends toward the downstream side. The inner diameter of the through-hole including this conical surface is slightly larger than the outer diameter of the shaft diameter tube 202.

The press member 143 is formed in ring shape, and is attached rotatably by the bearing 144. As shown in FIG.

The rolling tool 142 is composed of a plurality of balls, and is inserted into the conical surface of the processing head 141 and the pressing surface (upstream side) of the pressing member 143 so as to be planetary rotatable, and the shaft diameter tube 202 is directed toward the inside of the tube. Pressure. Accordingly, the rolling tool 142 is planetary rotated to press the shaft tube 202 against the grooved plug 113, and the plurality of pins 205 (spiral grooves) along the helical groove of the grooved plug 113. Can be formed on the inner surface of the shaft tube 202. The pin 205 can be formed at a predetermined twist angle (lead angle), a predetermined pin height, and a predetermined pin interval with respect to the tube axis. In addition, the rolling tool 142 can be comprised by the some roller, or can be comprised using a roller and a ball together.

By this groove processing apparatus 140, the shaft diameter pipe 202 supplied from the upstream side becomes the groove provision pipe 203 in which the groove | channel (pin 205) was formed in the inner surface.

At the time of this groove processing, the shaft diameter tube 202 is subjected to the groove processing load R2 as shown in FIG. 5.

The finishing apparatus 150 is comprised by the shaping | die shaping die 151. As shown in FIG. The die die 151 is formed with a die hole 152 having a conical surface that gradually extends toward the upstream side. The radius of the radius minimum part of this die hole 152 is formed slightly smaller than the outer peripheral radius of the groove provision pipe 203. As shown in FIG. By passing the grooved pipe 203 through the die hole 152, the outer circumferential surface of the grooved pipe 203 is slightly reduced in diameter to adjust the shape, thereby obtaining the inner surface grooved pipe 204 which is a finished product.

At the time of this finishing process, as shown in FIG. 5, the groove drawing pipe 203 is applied with the finishing drawing load R1.

The winding drum 160 is a drum which winds up the inner surface grooved tube 204. This winding is performed by the rotational force of the motor M1 according to the speed instruction signal of the controller 173. Moreover, this winding-up force becomes the linear drawing force F1 of the fixed direction with respect to the element pipe 201, and can generate a drawing torque, and can perform shaft diameter processing and an inner surface groove processing.

That is, while the element pipe 201 is drawn out by the winding drum 160, it is reduced in diameter by the reduction apparatus 120, the groove processing is carried out by the groove processing apparatus 140, and the finishing process of the outer peripheral surface is performed by the finishing apparatus 150. Can be.

Next, the device used for sensing will be described, and the shaft reduction device 120 and the auxiliary feeder 130 are fixed to the upstream machine frame 102. The upstream machine frame 102 configured as described above is fixed to the upstream movable platform 182, and the upper movable platform 182 is parallel to the drawing direction on the entire movable platform 184 (in this embodiment, horizontally). The reciprocating slide can be moved. That is, the upstream movable table 182 is provided with wheels 182a, and the wheels 182a are coupled to the rails 184b of the entire movable tables 184, thereby smoothly moving along the rails 184b. have. In this way, the shaft reduction device 120 and the auxiliary transport device 130 moves integrally with the upstream movable table 182.

Moreover, the upstream load detector 192 is provided in the drawing direction side edge part of the upstream movable stand 182. This upstream load detector 192 is comprised with the suitable detector which can detect a load, such as a load cell. By this upstream load detector 192, the load of the upstream movable stand 182 caught in the drawing direction at the time of drawing processing can be detected as an upstream load detection value V (T1) (refer FIG. 5).

The groove processing apparatus 140 and the finishing apparatus 150 are fixed to the entire machine frame 104. In addition, the whole machine frame 104 comprised in this way is being fixed to the whole movable stand 184, and parallel to the drawing direction on the fixed stand 186 with this all movable stand 184 (in this embodiment, horizontal). Can move the reciprocating slide. That is, the wheels 184a are installed in the entire movable table 184, and the wheels 184a are coupled to the rails 186b of the fixing table 186, thereby moving smoothly along the rails 186b. In addition, by this, the groove processing apparatus 140 and the finishing processing apparatus 150 move integrally with the entire movable table 184.

Moreover, the full load detector 194 is provided in the drawing direction side edge part of the whole movable stand 184. The total load detector 194 is constituted by a suitable detector capable of detecting a load such as a load cell. By this full load detector 194, the load of the whole movable stand 184 applied in the drawing direction at the time of drawing processing can be detected as downstream load detection value V (T2) (refer FIG. 5).

Next, a description will be given of the apparatus used for the control. The controller 171, the speed setter 172, the controller 173, the upstream signal converter 174, the entire signal converter 175, and the calculator 176 are provided. .

The controller 171 receives the rotation instruction speed S (H) from the calculator 176 and rotates the motor M2 at this speed. In addition, the actual rotational speed and torque of the motor M2 are fed back to the calculator 176.

The speed setter 172 is an apparatus which sets the drawing speed by the winding drum 160, and transmits a set value to the controller 173 and the calculator 176.

The controller 173 sets and instructs the rotational speed of the motor M1 based on the drawing speed received from the speed setter 172.

The upstream signal converter 174 is an electrical signal that detects a signal of the pressing force (detected by the upstream load detector 192) as the upstream movable platform 182 carrying the upstream machine frame 102 faces the drawing direction (material advancing direction). The signal is transmitted to the calculator 176 as the upstream load detection value V (T1).

The entire signal converter 175 is an electrical signal that detects a signal of the pressing force (to be detected by the full load detector 194) as the entire movable table 184 carrying the entire machine frame 104 faces the drawing direction (material advancing direction). The signal is transmitted to the calculator 176 as the downstream load detection value V (T2).

The calculator 176 uses the upstream load detection value V (T1) received from the upstream signal converter 174, the downstream load detection value V (T2) received from all the signal converters 175, and various setting information. The calculation is made and transmitted to the controller 171 while adjusting the rotational instruction speed S (H) of the motor M2 at any time.

Next, operation | movement of the manufacturing apparatus 101 of an inner surface grooved pipe is demonstrated with FIG. 6 shows the flowchart regarding the whole operation | movement of the manufacturing apparatus 101 of an inner surface grooved tube.

First, the manufacturing apparatus 101 of an inner surface grooved tube starts the winding drum 160 (step s1). On the other hand, the controller 173 manufactures the inner groove forming tube 204 based on the drawing speed received from the speed setter 172 so as to be wound at a constant drawing force F1 according to the material and diameter of the element pipe 201. The speed is controlled with respect to the motor M1 of the winding drum 160 until completion.

Next, the manufacturing apparatus 101 of the inner surface grooved tube starts the auxiliary feed apparatus 130 (step s2). At this time, the controller 171 executes the first auxiliary feed speed control on the motor M2 so as to be the initial auxiliary feed speed (first auxiliary feed speed) according to the material or diameter of the element pipe 201 (step s3). ). On the other hand, the initial auxiliary feed speed is a high speed in the range in which the small pipe 201 is not broken by the manufacturing apparatus 101 of the inner surface grooved pipe according to the material and diameter of the small pipe 201 to be processed, and has been set in advance. Speed.

In the manufacturing apparatus 101 of the inner surface grooved tube in this state, the element pipe 201 is not broken, but the grooving load R2 applied to the shaft diameter tube 202 in the grooving apparatus 140 is too large and grooved. In the device 140, the pin 205 is not formed, or the formed pin 205 cannot secure the predetermined precision.

And in this state, the manufacturing apparatus 101 of an inner surface grooved tube detects an upstream load detection value V (T1) with the upstream load detector 192 (step s4), and is downstream by the whole load detector 194. The load detection value V (T2) is detected (step s5) and transmitted to the calculator 176.

The calculator 176 calculates a load difference value T3 which is a difference between the upstream load detection value V (T1) and the downstream load detection value V (T2) received from the upstream load detector 192 and the total load detector 194. (Step s6).

This load difference value T3 has shown the total load of the grooving load R2 applied to the grooving apparatus 140, and the finishing pull load R1 applied to the finishing apparatus 150. As shown in FIG. In detail, as mentioned above, the upstream load detection value V (T1) is the load of the upstream movable stand 182 which is caught in the drawing direction at the time of drawing processing, ie, the shaft drawing load R3 in the shaft-reducing device 120. ) And the total load of the auxiliary feed force F2 by the auxiliary feed device 130 is shown.

On the other hand, the downstream load detection value V (T2) is the load of the entire movable table 184 which is caught in the drawing direction at the time of drawing processing, that is, the shaft drawing load R3 in the shaft diameter device 120, and the auxiliary feed device ( The total load of the auxiliary feed force F2 by 130), the grooving load R2 in the grooving apparatus 140, and the finishing draw load R1 in the finishing machine 150 is shown.

Therefore, the load differential value T3 which is the difference between the upstream load detection value V (T1) and the downstream load detection value V (T2) is the groove processing load R2 applied to the groove processing apparatus 140 and the finishing apparatus 150. ) Is the total load of the finishing draw load R1.

Here, in the finishing apparatus 150, in order to obtain the inner surface grooved tube 204 used as a finished product, the outer peripheral surface of the groove | channel provision tube 203 is slightly reduced. The finishing drawing load R1 in the finishing apparatus 150 applied at this time is substantially constant, and is small enough to be negligible compared with the shaft diameter drawing load R3 in the shaft reduction apparatus 120. Therefore, you may consider load difference value T3 as shaft diameter drawing load R3 in the groove processing apparatus 140 substantially.

On the other hand, the shaft pull-out load R3 in the groove processing apparatus 140 has a great influence on the formation of the fin 205 when the groove attaching tube 203 is formed from the shaft pipe 202 supplied from the upstream side. Crazy Specifically, when the shaft pull-out load R3 in the grooving apparatus 140 is smaller than a predetermined range set in advance, that is, the load is small in the formation of the pin 205 in the grooving apparatus 140. This means that sufficient fin 205 is not formed.

In addition, on the contrary, also when the shaft pull-out load R3 in the grooving apparatus 140 is larger than a predetermined range, ie, when the load is too large in formation of the pin 205 in the grooving apparatus 140, it is similar. , The desired pin 205 cannot be formed.

Therefore, the calculator 176 assists the shaft diameter tube 202 with the auxiliary feeder 130 to act so that the load differential value T3 is within a predetermined range set in advance according to the material and diameter of the element pipe 201. Calculate the feed torque (step s7).

The auxiliary feed torque is calculated based on the no-load torque and the dynamic friction torque, and becomes the torque for sending the shaft diameter tube 202 toward the groove processing apparatus 140 by the auxiliary feed device 130. It is not possible to torque control the motor M2 in) to match the auxiliary feed torque calculated in step s7.

Therefore, the calculator 176 instructs the controller 171 to increase and decrease the speed so as to be the second auxiliary feed speed determined based on the correlation with respect to the auxiliary feed torque set in advance according to the material and diameter of the element pipe 201. Is transmitted, the controller 171 executes torque control based on the increase / deceleration instruction received for the motor M2 (step s8).

On the other hand, in step s3, according to the material and diameter of the element pipe 201, the initial auxiliary feed speed which is the high speed in the range which the element pipe 201 is not broken by the manufacturing apparatus 101 of an inner surface groove forming pipe (1st) In this embodiment of speed limiting to (secondary feed rate), the second auxiliary feed speed determined based on the correlation of the auxiliary feed torque, ie, the auxiliary feed torque, which is torque controlled to the auxiliary feed device 130 in step s8 is It is lower than the initial auxiliary feed speed (first auxiliary feed speed), and the controller 171 decelerates and controls the motor M2.

The manufacturing apparatus 101 of the inner surface grooved tube which performed the torque control with respect to the auxiliary feeder 130 in step s8 is upstream with the upstream load detector 192 and the full load detector 194 similarly to steps s4-s6. The load detection value V (T1) and the downstream load detection value V (T2) are detected, the calculator 176 calculates the load difference value T3 after torque control of the auxiliary feeder 130, and the calculated load difference It is determined whether the value T3 is within a predetermined range set in advance (step s9).

When the load differential value T3 after torque control of the auxiliary feeder 130 is not in the predetermined range (step s9: No), it returns to step s4 and the calculator 176 has predetermined load differential value T3. The auxiliary feed torque is calculated to be within the range.

On the contrary, when the load differential value T3 after torque control of the auxiliary feed apparatus 130 is in the predetermined range preset (step s9: YES), the controller 171 may be provided with a predetermined amount of the inner surface groove forming pipe 204. It is judged whether it is manufactured (step s10), and when the predetermined amount of inner surface grooved tube 204 is already manufactured, manufacture of the inner surface grooved tube 204 by the manufacturing apparatus 101 of an inner surface grooved tube is stopped. (Step s10: yes). On the other hand, if a predetermined amount of inner surface grooved tube 204 has not yet been produced (step s10: no), the process returns to step s4 until the predetermined amount of inner surface grooved tube 204 is manufactured. Steps s4 through s9 are repeated.

In this manner, the above-described control is performed using the apparatus 101 for manufacturing the inner surface grooved tube having the above-described configuration, thereby improving the productivity of the inner surface grooved tube 204 in which the pin 205 with high precision is formed. have.

Specifically, the manufacturing apparatus 101 of the inner surface grooved tube was detected by the calculator 176 by the upstream load detection value V (T1) and the total load detector 194 detected by the upstream load detector 192. The load difference value T3 which is the difference of the downstream load detection value V (T2), and which shows the shaft-diameter drawing load R3 in the groove processing apparatus 140 is preset previously according to the material and diameter of the element pipe 201. The auxiliary feed torque acting on the shaft diameter tube 202 by the auxiliary feed apparatus 130 is controlled so that it may fall within the predetermined range set. For this reason, the shaft pull-out load R3 which has a big influence in formation of the pin 205 is stabilized, and the pin 205 of a desired precision can be formed even in the machining conditions near a machining limit.

Thus, for example, an inner surface grooved tube 204 of precision that has not been possible in the past (for example, a pin of 0.2 mm or more having a high torsion angle (lead angle) having a high torsion angle (lead angle) of 40 to 60 ° with respect to the tube axis is adjacent to the fin height H)). The pipe etc. which were formed in the inner surface so that ratio (H / t) with the groove | bottom thickness thickness t between the fin to be 1.2 or less can be manufactured more productively.

In addition, by using the second auxiliary feed speed that is determined based on the correlation to the auxiliary feed torque preset in accordance with the material and diameter of the pipe 201, the auxiliary feed torque for torque control of the auxiliary feed device 130. The torque control can be performed to reliably torque the motor M2 that cannot be torque controlled to form the pin 205 with the desired accuracy.

Moreover, in the manufacturing apparatus 101 of an inner surface grooved tube, according to the material and diameter of the small pipe 201 which is a process object, in the manufacturing apparatus 101 of the said inner surface grooved tube, in the range which does not fracture | rupture, It is a high speed of and controls by the 1st auxiliary feed speed preset. Subsequently, torque control of the auxiliary feed device 130 is performed at a second auxiliary feed speed that is lower than the initial auxiliary feed speed (first auxiliary feed speed) and is determined based on a correlation to the auxiliary feed torque. For this reason, the productivity of the inner side groove forming pipe 204 which has the pin 205 formed with desired precision can be improved.

Moreover, the manufacturing apparatus 101 of an inner surface grooved pipe | tube has the internal surface which has the pin 205 of desired precision by torque control of the auxiliary feeder 130, making constant the pulling force F1 by the winding drum 160. FIG. Since the groove forming tube 204 is manufactured, the inner surface groove forming tube 204 can be manufactured with high productivity, without complicating control.

In addition, a predetermined range which becomes a reference | standard which controls the drawing force F1, the initial auxiliary feed speed (1st auxiliary feed speed), and the load differential value T3 in the winding drum 160 is carried out Since the setting is made based on the speed, range, and correlation of the material and diameter of the 201, it can be processed in response to the load variation according to the material and the diameter of the element pipe 201. Therefore, the pin 205 of high precision can be formed regardless of the material and diameter of the element pipe 201, and generation | occurrence | production of a fracture can be reduced.

On the other hand, the manufacturing apparatus 101 of an inner surface grooved tube fixes the shaft diameter device 120 and the auxiliary conveying apparatus 130 to the upstream movable stand 182 which is relatively movable with respect to the winding drum 160, and wound coil ( The upstream load detector 192 which detects the load of the upstream movable stand 182 which moves relatively at the time of the drawing of the element pipe 201 by 160 is provided.

Thus, for example, the entire shaft reduction device 120, the auxiliary feeder 130, the groove processing device 140, and the finishing device 150 are placed on the entire movable table 184 that is relatively movable with respect to the winding drum 160. Compared with the manufacturing apparatus of the inner surface grooved pipe which fixes and detects the load applied to the entire movable table 184, the upstream load is applied to the subsidiary feed torque by the subsidiary feed device 130 which has a great influence on the formation of the pin 205. It can guess from the detection result by the detector 192, and can control torque.

Therefore, the inner surface grooved pipe 204 having the pins 205 of higher precision can be manufactured with higher productivity.

Moreover, the manufacturing apparatus 101 of an inner surface grooved pipe | tube includes the upstream load detector 192 which detects the load on the upstream movable stand 182, and the all load detector which detects the load applied to the whole movable stand 184 ( 194, the calculator 176 calculates from the upstream load detection value V (T1) and the downstream load detection value V (T2) detected by the upstream load detector 192 and the total load detector 194. In addition to the load differential value T3, the auxiliary transfer device 130 may be torque controlled in consideration of the upstream load detection value V (T1).

Furthermore, in addition to the load differential value T3, the structure which controls the pull-out force F1 by the winding drum 160 may be considered in consideration of the downstream load detection value V (T2) detected by the all load detector 194.

Thus, the upstream load detector 192 which detects the load applied to the upstream movable stand 182 by the manufacturing apparatus 101 of an inner surface grooved tube, and the full load detector which detects the load applied to the whole movable stand 184 ( Since 194 is provided, even if the thickness is further thinned or the torsion angle (lead angle) of the pin 205 becomes larger, the complexity of the control is increased, but the inner surface grooved tube in which the pin 205 of higher precision is formed is provided. The productivity of 204 can be improved.

In addition, since the upstream load detector 192 and the total load detector 194 are constituted by the same apparatus, the change curve of the values detected by both detectors is approximated, so that the auxiliary feeder 130 or the winding drum 160 Speed and torque can be adjusted precisely.

On the other hand, in correspondence with Embodiment 2 mentioned above and the structure of this invention, the shaft reduction apparatus 120 of this embodiment corresponds to a shaft reduction means,

The auxiliary transport device 130 corresponds to the transport auxiliary means,

The groove processing apparatus 140 corresponds to the groove processing means,

The winding drum 160 corresponds to the drawing means,

The controller 171 and the calculator 176 correspond to the control means,

The auxiliary feed speed corresponds to the feed auxiliary speed,

The auxiliary feed torque corresponds to the feed auxiliary torque,

Upstream movable platform 182 corresponds to the mobile platform,

The entire movable table 184 responds to expectations,

The upstream load detector 192 corresponds to a moving table load detection device,

The total load detector 194 corresponds to the expected load detection device,

Step s3 corresponds to the feed assist speed adjustment process,

Step s8 corresponds to the feed assist torque adjustment process;

The pressing tool corresponds to the rolling tool 142, but the present invention is not limited to the configuration of the second embodiment, and can be implemented in many embodiments.

(Embodiment 3)

Next, the manufacturing apparatus 312 and the manufacturing method of the inner surface grooved tube of Embodiment 3 are demonstrated using drawing.

7 is explanatory drawing of the manufacturing apparatus 312 of the inner surface grooved tube in this embodiment.

The manufacturing apparatus 312 of the inner surface grooved tube in the present embodiment, as shown in FIG. 7, has a reduction means 313 which reduces the small pipe 311a along the drawing direction X of the small pipe 311a. And a groove processing means 314 for forming a plurality of grooves on the inner surface of the element pipe 311a, and the shaft diameter means 313 between the shaft diameter means 313 and the groove processing means 314. The intermediate drawing part 317 which draws out one pipe 311a is provided.

The said diameter reduction means 313 is arrange | positioned in the diameter reduction die 322 and the floating pipe 311a, and is comprised by the floating plug 323 which diameter-reduces the primary pipe 311a with the said diameter reduction die 322. As shown in FIG.

The groove processing means 314 is rotatably connected to the floating plug 323 through a connecting rod 325 in the element pipe 311a, and a groove forming plug 324 having a plurality of grooves formed on an outer circumference thereof, and an element pipe It is comprised by the some process ball 326 arrange | positioned so that revolving around the tube axis, while pressing the said small pipe 311a to the said groove formation plug 324 side in the outer side of 311a.

The manufacturing apparatus 312 and the method of manufacturing the apparatus for manufacturing the inner surface groove formed using the 312 tube 311, as shown in Fig. 8, the outer diameter D ₀ (㎜) of said base tube (311a), the shaft diameter By the diameter D ₂ (mm) of the die 322, the axial diameter ratio R _D of the element pipe 311a represented by R _D = {(D ₀ -D ₂ ) / D ₀ } × 100 (%), It is set to 30% or less in the shaft reduction means 313.

Further, the outer diameter D ₁ (㎜) of the floating plug (323), setting the diameter D ₂ (㎜) of the shaft diameter of the die 322 so that the D ₁ -D ₂ ≥0.1.

Moreover, the revolving direction of the said processing ball 326 is set to the reverse direction, and the processing pitch P (mm) of the said processing ball 326 is set so that it may become 0.2 <= P <= 0.7.

Or when setting the revolving direction of the said processing ball 326 to a positive direction, the processing pitch P (mm) is set so that it may become 0.2 <= P <= 0.4.

Hereinafter, the manufacturing apparatus 312 of the inner surface grooved tube in this embodiment is described in detail.

The said manufacturing apparatus 312 is a shaft diameter means 313, the intermediate drawing part 317, the groove processing means 314, the shaping | die shaping die 315, and a drawing part from the upstream to downstream of the drawing direction X. It consists of 316.

Moreover, the said manufacturing apparatus 312 supports the shaft diameter means 313, the intermediate drawing part 317, and the grooving means 314 so that the manufacturing apparatus 312 can move to the drawing stand 350 in the drawing direction. And a load cell 328 for detecting a load F acting upon the movement of the movable table 333 with respect to the stator 350, and the load F detected by the load cell 328. The control unit 345 controls the intermediate drawing unit 317 and the drawing unit 316.

The shaft reduction means 313 is constituted by the shaft diameter die 322 and the floating plug 323 as described above.

The said shaft diameter die 322 is comprised in the cylindrical shape which has the communication hole 322a connected in the drawing direction X, and the communication hole 322a has the upstream part (inlet side) of the drawing direction X. It is comprised by the shape which opened in the shape which the edge | tip widens gradually toward an upstream side with respect to a downstream part (outlet side).

The floating plug 323 is configured in a cylindrical shape, and the outer circumference of the downstream portion is configured in a tapered shape.

On the other hand, it has set up, the inner diameter of the outlet side of the floating plug 323, the outer diameter D ₁ (㎜), shaft diameter of the die 322 of as shown in Fig. 8 with D ₂ (㎜).

The groove processing means 314 includes a groove forming plug 324, a plurality of processing balls 326, and a processing head 327 holding the processing balls 326 from the outer circumferential side.

The processing head 327 is provided with a processing ball holder 327a having a semicircular cross section.

The plurality of processing balls 326 are held so as to be able to revolve while pressing the surface of the element pipe 311a by the processing ball holder 327a. The plurality of processing balls 326 are held by the processing ball holder 327a so as to change the revolution speed while pressing the surface of the element pipe 311a in either the forward direction or the reverse direction.

The shaping die 315 smoothly shapes the distortion of the tube surface or the like caused by the pressing of the processing ball 326 in the grooving means 314 as the inner groove forming tube 311 passes therethrough. Processing.

The drawing portion 316 has a winding drum 336 which winds up the finished inner surface groove forming tube 311, and has a motor M1 for driving the winding drum 336. _The inner surface groove forming tube 311 is wound around the winding drum 336 by the rotation drive of ₁ ).

The intermediate drawing portion 317 assists drawing by the drawing device 316 by drawing the element pipe 311a in the drawing direction X between the shaft diameter means 313 and the grooving means 314. . That is, the grooving by the grooving means 314 becomes a resistance when drawing the element pipe 311a, and the load of the gull during the grooving increases, but the grooving by the intermediate drawing part 317 The drawing load on 311a) can be distributed.

The said intermediate drawing part 317 is equipped with the pair of belt 342a, 342a arrange | positioned at the upper and lower sides, or the left and right each side with respect to the element pipe 311a. Each of the belts 342a and 342a is formed in a loop (endless type) and spans the pulley 343 so as to be rotatable by the rotational drive of the motor M ₂ . On the outer peripheral surface of the belts 342a and 342a, a plurality of pads 344 extend out along the longitudinal direction thereof.

Although not shown in the pad 344, the cut surface of the plurality of pads 344 in the extending direction in the contact direction with the outer surface of the element pipe 311a after being reduced in diameter by the shaft reduction means 313 is arcuate. Pad grooves are formed.

The middle drawing unit 317, and is configured to be able to push the pad 344 by the driving of the motor (M ₃₎ to the surface of tube blank (311a).

On the other hand, on the upstream side of the intermediate drawing portion 317, a wiper 351 for removing oil film or foreign matter adhering to the outer surface of the element pipe 311a is provided, and on the downstream side, an intermediate shaping die 352 is provided. have.

The wiper 351 is provided to remove an oil film or foreign matter adhering to the outer surface of the element pipe 311a, and penetrates a diameter much smaller than the outer diameter of the element pipe 311a to allow the element pipe 311a to pass therethrough. The hole is formed in, for example, a tubular body made of rubber.

On the other hand, when the wiper 351 is not provided, slippage occurs in the intermediate drawing portion 317 due to the oil film or foreign matter, and the drawing of the element pipe 311a is not stable and the cross-sectional shape is not stable. Problem arises that the size of the groove fluctuates.

The intermediate shaping die 352 is provided in order to return the cross-sectional shape of the flat pipe 311a to the shape close to a round in the intermediate drawing part 317, and according to the shape of the pipe 311a, It is comprised by the diameter of the dice | dies equal to or smaller than the diameter of the dice | 322.

On the other hand, the intermediate shaping die 352 is made of a harder than the material of the metal tube 311a, such as metal, ceramic. Preferably it is a cemented carbide.

The movable table 333 is provided on the fixing table 350 through a plurality of wheels 333a so as to be able to move in parallel with the fixing table 350 in the drawing direction or the reverse direction thereof, and the above-described shaft diameter means 313 and the groove are provided. The processing means 314, the shaping die 315, the intermediate drawing part 317, the wiper 351, and the intermediate shaping dice 352 are provided in the state which accommodated in the box 332.

The load cell 328 can detect the load F received from the movable table 333 at the downstream end portion of the movable table 333 above the fixing table 350 in accordance with the drawing force of the element pipe 311a. It can be installed.

The control unit 345 receives a load detection signal S _in which an electrical signal of the load F detected by the load cell 328 is input, and according to the control program, the drawing unit 316 and the intermediate drawing unit ( A control signal S _out for controlling the driving of each motor M ₁ , M ₂ , M ₃ of the 317 is output.

Although not shown, the control unit 345 temporarily stores an arithmetic unit (CPU) for executing signal analysis and arithmetic processing, a hard disk for storing necessary control programs, and the load detection signal S _in . A memory for the storage device may be provided, and other means may be appropriately provided with input means such as a keyboard for inputting control parameters and display means such as a monitor.

The controller 345 controls the driving force on the element pipe 311a by the pad 344 of the intermediate draw portion 317 by controlling the driving of the motor M ₃ of the intermediate draw portion 317.

By pushing the pad 344 with an appropriate pressing force against the element pipe 311a, the slip between the pad 344 and the element pipe 311a is reduced, so that the variation in the load F is reduced.

If the fluctuation of the load F increases, fluctuations occur in the shape of the groove in the longitudinal direction, and fluctuations in the depth of the groove in the longitudinal direction make it impossible to secure a constant heat conduction performance, or expand the heat exchanger to the aluminum fin ( This is because the fluctuation in the degree of expansion occurs at the time of insertion of the pipe, which results in partial expansion deficiency, which causes a decrease in the performance of the heat exchanger due to insufficient adhesion to the aluminum fins.

On the other hand, in order to reduce the variation in the load F, the rotation of the belts 342a and 342a in the intermediate drawing portion 317 may be controlled. At this time, the control unit 345 may be configured to control not only the rotation torque of the pulley 343 but other control parameters such as rotation speed and acceleration.

Subsequently, in the manufacturing method of the inner surface grooved tube 311 using the manufacturing apparatus 312 of the inner surface grooved tube mentioned above, when the small tube 311a advances in the drawing direction X, the small tube 311a is reduced in diameter. And a groove processing step of forming a plurality of grooves on the inner surface of the element pipe 311a, and performing the diameter reduction processing step and the groove processing step. An intermediate drawing process for drawing is performed.

The said shaft diameter processing process is performed by the shaft diameter die 322 and the floating plug 323 which is arrange | positioned in the element pipe 311a, and reduces the element pipe 311a with the said shaft diameter dice 322.

The groove processing step is connected to the floating plug 323 rotatably through the connecting rod 325 in the element pipe 311a, the groove forming plug 324 formed with a plurality of grooves on the outer circumference, and the element pipe 311a It is performed by the some process ball 326 arrange | positioned so that revolving around a tube axis, while pressing the said small pipe 311a to the said groove formation plug 324 side in the outer side of the.

The manufacturing apparatus 312 and the manufacturing method can exhibit the following effects.

The manufacturing apparatus 312 and the manufacturing method is as described above, by the outer diameter D ₀ (㎜), the diameter D ₂ (㎜) of the shaft diameter of the die 322 of the base tube (311a), R _D = { The shaft diameter ratio R _D of the element pipe 311a represented by (D ₀ -D ₂ ) / D ₀ } × 100 (%) is set to 30% or less in the shaft diameter means 313.

For this reason, what is called a chattering phenomenon in which the element pipe 311a vibrates finely after the diameter reduction by the said shaft diameter means 313 is suppressed, and the load assistance which assists drawing load in the said intermediate drawing part 317 can be stabilized.

The manufacturing apparatus 312 and the above-described manufacturing method, the outer diameter D ₁ (㎜), the diameter D ₂ (㎜) of the shaft diameter of the die (322) of the floating plug (323) as described above, D ₁ -D ₂ is set to ≥ 0.1.

For this reason, generation | occurrence | production of a chattering phenomenon can be suppressed more effectively, and the excessive tapering phenomenon and thickness reduction at the time of an axis diameter processing process can be prevented.

As described above, in the manufacturing apparatus 312 and the manufacturing method, when the revolving direction of the processing ball 326 is set in the reverse direction, the processing pitch P (mm) is set so as to be within a range of 0.2≤P≤0.7. have.

For this reason, the groove formation pipe with high processing precision of a groove can be manufactured stably.

Or as mentioned above, when the said manufacturing apparatus 312 and the said manufacturing method set the revolution direction of the processing ball 326 to a positive direction, the processing pitch P (mm) of the processing ball 326 is 0.2 <= P It is set so that it may become a range of ≤ 0.4.

As a result, it is possible to obtain a groove having a deep groove depth and a high processing accuracy without generating a dent at the base of the inner surface pin.

(Example)

Subsequently, in order to verify the effectiveness of the manufacturing apparatus 312 and the said manufacturing method of Embodiment 3, the processing experiment which processed the element pipe 311a into the inner groove formation pipe 311 was performed (Examples 10-15).

In Example 10, the shaft diameter ratio R _D of the element pipe 311a in the shaft diameter means 313, and the engagement (D ₁ -D ₂ ) of the floating plug 323 and the shaft diameter dice 322 in Example 11, is carried out. In Example 12, the machining pitch P of the machining ball 326, the groove depth and the torsion angle of the groove-forming plug 324 in the thirteenth embodiment, the revolution speed of the machining ball 326 in the fourteenth embodiment, and the fifteenth embodiment The number of the processing balls 326 was changed as parameters, respectively, to evaluate the performance of the processing.

Hereinafter, each of Examples 10-15 is described in detail.

(Example 10)

In Example 10, the groove formation process experiment which examines the influence on a process by changing the shaft diameter _RD of the element pipe 311a by the shaft diameter means 313 was performed.

In this machining experiment, the microtubules 311a were processed by setting the processing conditions for each of Examples 1 to 3 and Comparative Examples 1 and 2 of the present invention to form an inner groove forming tube 311.

In Examples 1 to 3 and Comparative Examples 1 and 2 of the present invention, the thickness T ₀ of the element pipe 311a, the diameter D ₂ of the shaft diameter die 322, the outer diameter D ₁ of the floating plug 323, and the groove The outer diameter of the forming plug 324, the number of grooves, the torsion angle, the groove depth, the groove vertex angle, the number of the processing balls 326, the revolution speed, and the processing pitch are processed under common conditions as shown in Table 4. Carried out.

Element thickness (T ₀ ). 0.30 mm
The diameter D ₂ of the shaft die. φ7.70 mm
The outer diameter of the floating plug D ₁ . φ8.30 mm
-Groove forming plug… Outer diameter φ7.00 mm, number of grooves 55, torsion angle 50 degrees, groove depth 0.20 mm
Home vertex angle 15 degrees
-Number of machining balls (C). 4
-Idle rotation speed (R) of the machining ball. 20000 rpm
-The idle direction of the processing ball. Reverse direction of rotation of groove forming plug
Machining pitch (P). 0.40 mm

In the machining experiment, as shown in Table 5 for each of Examples 1 to 3 and Comparative Examples 1 and 2 of the present invention, the die diameter D ₂ of the shaft diameter die 322 was made constant, and By changing only the outer diameter D ₀ , the shaft diameter R _D was changed.

As shown in Table 5, in the invention examples 1 to 3, and both the shaft diameter ratio (R _D) under the setting is not more than 30%, Comparative Examples 1 and 2, the shaft diameter ratio (R _D) is set greater than 30% Processing was carried out under.

The processing result was evaluated by the fluctuation of the groove depth in the longitudinal direction of the groove formed in the inner pipe 311a inner surface after the groove forming process.

Moreover, the fluctuation | variation state of the groove depth in the longitudinal direction, and the stability degree of the load F detected at the time of shaft diameter machining by the load cell 328 provided in the shaft diameter means 313 are closely related. For this reason, when a load fluctuation occurs, it affects the groove shape (especially groove depth) formed in the inner surface of the element pipe 311a, and the magnitude of the load fluctuation becomes the magnitude | size of the fluctuation of the groove depth in the longitudinal direction of a groove as it is. appear.

For this reason, the stability degree of the load F detected at the time of shaft diameter processing can also be evaluated by evaluating the fluctuation | variation of the groove depth in the longitudinal direction of the groove | channel formed in the inner surface of the element pipe 311a.

As for the processing result, when the fluctuation | variation of the groove depth in the longitudinal direction which shows the stable state of a load is 0 to 0.020 mm, it is set as "◎", and when the case is 0.021-0.050 mm, it is set as "(circle)" and it is 0.051 mm or more It evaluated as "x".

Table 5 shows the processing results carried out under the conditions of Examples 1 to 3 and Comparative Examples 1 and 2 of the present invention.

As shown in Table 5, Example 1 of the present invention is "○", Examples 2 and 3 of the present invention become "◎", and Examples 1 to 3 of the present invention provide the desired inner groove forming tube 311, Both the comparative examples 1 and 2 became "x", and the desired inner surface groove forming pipe 311 was not obtained.

Specifically, when the shaft diameter R _D was greater than 30%, the fluctuations in the groove depths in the longitudinal direction of the grooves increased as in Comparative Examples 1 and 2.

When the axis diameter _RD of the element pipe 311a becomes larger than 30%, as shown in FIG.12 (a), the contact area A of the element pipe 311a and the said shaft diameter dice 322A becomes large, and a frictional resistance becomes large. . Then, the processing load in the shaft diameter die 322A becomes large, and an excessive tapering phenomenon occurs in which the outer diameter D _f of the element pipe 311a becomes thinner than the diameter D ₂ of the outlet of the shaft diameter die 322A. It throws away (refer the enlarged view of area | region Z1 of FIG. 12 (a)).

In addition, due to the excessive tapering phenomenon, the contact between the element pipe 311a and the shaft diameter die 322A is not stabilized, and a chattering phenomenon tends to occur, resulting in a decrease in thickness.

Thus, the degree of "excess tapering phenomenon" or "thickness reduction" in which the outer diameter D _f of the element pipe 311a after passing through the reduction diameter means 313 becomes smaller than the diameter D ₂ of the reduction diameter die 322A becomes large. , The load assistance at the intermediate drawing part 317 became unstable. In addition, a chattering phenomenon in which the tube is vibrated finely occurs, whereby the instantaneous fluctuation of the load increases.

For this reason, in Comparative Examples 1 and 2, it is considered that the fluctuations in the groove depths in the longitudinal direction of the grooves appear as a result of increase.

As in Comparative Examples 1 and 2, the heat transfer performance is lowered in the inner surface groove forming tube 311 in which the groove depth is changed in the longitudinal direction. Further, since the fluctuation in the degree of expansion occurs during expansion of the heat exchanger into the aluminum fins, the expansion of the heat exchanger is partially insufficient, resulting in a decrease in heat exchanger performance due to insufficient adhesion with the aluminum fins.

In addition, when the variation in the load is large, breakage may occur during machining, so the variation in the load is preferably smaller.

On the other hand, as shown in the result of Table 5, when the reduction ratio R _D in the reduction means 313 is 30% or less, the fluctuations in the groove depth in the longitudinal direction are reduced as in Examples 1 to 3 of the present invention. As a result, the stability of the load F was good, and in particular, the smaller the shaft diameter R _D was, the better the stability of the load F could be demonstrated.

Specifically, in Examples ₁ to 3 of the present invention, as shown in FIG. 9, when the axis diameter R _D is 30% or less and D ₁ -D ₂ ≥ 0.1, the outer diameter of the element pipe 311a after the axis diameter processing (D _f ) is approximately equal to the diameter (D ₂ ) of the shaft diameter die 322, and the thickness T _f of the element pipe 311a after the shaft diameter processing is equal to the thickness T ₀ of the element pipe 311a. The processing of increasing slightly was realized.

(Example 11)

Embodiment 11, and subjected to diametral reduction means 313, floating-plug (323) and the shaft diameter of the groove forming process to investigate the effect of processing by changing the engagement (D ₁ -D ₂₎ of the die 322 in the test.

In this processing experiment, the element pipe 311a was processed for each of the conditions of Examples 4 to 8 and Comparative Example 3 of the present invention to prepare an inner groove forming tube 311.

In this machining experiment, under the machining conditions of Examples 4 to 8 and Comparative Example 3 of the present invention, as shown in Table 6, the floating plug 323 of the die diameter D ₂ of the constant shaft diameter die 322 was used. The machining was performed by changing the outer diameter D ₁ and changing the degree of engagement (D ₁ -D ₂ ) between the floating plug 323 and the shaft diameter die 322.

Invention Under honor 4-8 In both (D ₁ -D ₂₎ is set 0.1 or more, in Comparative Example 3, the (D ₁ -D ₂₎ was subjected to machining under setting is smaller than 0.1.

Table 6 shows the results of the processing performed under the respective processing conditions of Examples 4 to 8 and Comparative Example 3.

On the other hand, in Examples 4 to 8 and Comparative Example 3, the element 311a having a common dimension having an outer diameter D ₀ of 9.53 mm and an inner diameter 8.93 mm of the element 311a was used, and the conditions other than that were shown in Tables. As shown in FIG. 4, processing was performed on common conditions. In addition, the processing result was evaluated as "(circle)", "(circle)", and "x" based on the fluctuation | variation state of the groove depth in the longitudinal direction of the groove | channel formed after groove forming process similarly to Example 10.

As apparent from Table 6, in Examples 4 to 8 of the present invention, the processing result was "◎" or "○", and the desired inner surface groove forming tube 311 was obtained. It became "x" and the desired inner surface groove forming pipe 311 was not obtained.

As described above, when (D ₁ -D ₂ ) is smaller than 0.1, the load on the shaft diameter means 313A becomes unstable as in Comparative Example 3.

Specifically, when the engagement D ₁ -D _{2 of the} floating plug 323A and the shaft diameter die 322A is smaller than 0.10 mm, as shown in the enlarged view of the area Z3 in FIG. 12B, the floating plug is floating. Only the vicinity of the corner C of the plug 323A comes into contact with the inner surface of the element pipe 311a, so that the load applied in the drawing direction X is received only in the vicinity of the corner C.

In general, at the time of shaft diameter, the thickness of the element pipe 311a does not become thin and, on the contrary, the thickness of the element pipe 311a is increased within 0.01 mm. However, when (D ₁ -D ₂ ) is smaller than 0.1, the thickness of the element pipe 311a is decreased. It is reduced in diameter while being excessively reduced, and excessive tapering of the tube outer diameter occurs, as shown in the enlarged view of the region Z2 in FIG. 12B.

The smaller the engagement D ₁ -D ₂ of the floating plug 323A and the shaft diameter die 322A, the greater the instantaneous fluctuation of the load, especially when (D ₁ -D ₂ ) is smaller than 0.10 mm, the tube vibrates finely. The chattering phenomenon also occurs, whereby the instantaneous fluctuation of the load is further increased, and the degree of excessive tapering phenomenon is also changed.

Thereby, the element pipe 311a was broken by the shaft reduction means 313A.

In the state where the intermediate drawing portion 317 is provided in this state, the contact area between the pad 344 and the element pipe 311a in the intermediate drawing portion 317 fluctuates so that the contact area cannot be sufficiently secured. The load assistance at the part 317 becomes unstable. In addition, when the intermediate drawing portion 317 is provided, the number of contacts of the pad 344 is changed, or the vibration due to the repetition of contact and opening of the pad 344 with respect to the element pipe 311a affects the intermediate drawing. Compared with the conventional machining method without the part 317, the instantaneous fluctuation of the load becomes larger.

On the other hand, when (D ₁ -D ₂ ) is 0.1 or more, the stability of the load in the shaft-reducing means 313 is good, as in Examples 4 to 8 of the present invention, and particularly from the processing results of the Examples 4 to 6 of the present invention (D ₁ -D ₂₎ is greater, it was possible to demonstrate that the process be carried out under steady load, as shown in Fig.

(Example 12)

In Example 12, the groove | tube formation process experiment which examines the influence on a process by changing a process pitch P was performed.

In this machining experiment, as in the respective conditions of Examples 9 to 32 of the present invention shown in Table 7, as the machining conditions for changing the machining pitch P in each of the cases where the revolving directions of the machining balls 326 are forward and reverse directions. The inner surface grooved tube 311 was processed.

In Examples 9 to 32 of the present invention, the inner grooved tube 311 was processed under the processing conditions satisfying the conditions of the present invention in which the axial diameter R _D was 30% or less. Inventive Examples 11 to 18 and Inventive Examples 23 to 25 process the inner surface grooved tube 311 under particularly suitable processing conditions among the inventive examples.

Specifically, in Examples 11 to 18 of the present invention, the revolving direction of the processing ball 326 is set in the reverse direction, and processing is performed under a setting in which the processing pitch P (mm) is 0.2 mm or more and 0.7 mm or less. In 23-25, the revolving direction of the processing ball 326 was set to the positive direction, and the process was performed under the setting which the processing pitch P (mm) will be 0.2 mm or more and 0.4 mm or less.

On the other hand, in Examples 9, 10, 19, and 20 of the present invention, the revolving direction of the machining ball 326 is set in the reverse direction, and the machining pitch P (mm) is processed under a setting that is smaller than 0.2 mm or larger than 0.7 mm. Carried out. In Examples 21, 22, and 26 to 32 of the present invention, all set the revolving direction of the processing ball 326 in the forward direction, and the processing was performed under the setting such that the processing pitch P (mm) was smaller than 0.2 mm or larger than 0.4 mm. Carried out.

Moreover, in Examples 9-32 of this invention, the common pipe 311a of 9.53 mm of outer pipe diameters 311a, and 8.93 mm inner diameter is used, and also about other conditions, processing is carried out under common conditions as shown in Table 4; Carried out.

Here, the processing pitch P (mm) means that the processing ball 326 revolves around the small pipe 311a by an angle equally distributed by the number of processing balls 326 arranged on the outer circumference of the small pipe 311a. While the tube 311a represents the distance in the drawing direction X.

Specifically, in Example 12, since four processing balls 326 are disposed on the outer circumference of the element pipe 311a, as shown in FIG. 10, the processing ball 326 places the outer tube 311a outer circumference 90. The moving distance P by which the element pipe 311a advances in the drawing direction X is made into the processing pitch P between rotation.

10 is explanatory drawing explaining the processing pitch P which showed typically the groove processing means 314 partially omitted. In addition, La, Ld, and Lb shown by the virtual line in FIG. 10 are three process balls 326a, 326d, and 326b shown in FIG. 10 among the four process balls 326 arrange | positioned at the outer periphery of the element pipe 311a, respectively. The locus which pressed this pipe 311a is shown. In addition, in FIG. 10, the rotating direction of the said processing ball 326 is a reverse direction (direction opposite to the rotation direction of the said groove | channel plug 324). On the other hand, when the processing ball 326 is in the positive direction, the trajectories La, Lb, and Ld of the processing ball 326 are in the manner of descending to the right in FIG. 10.

The processing result was evaluated by "formation of the groove" (unfilled or not) of the tube thickness part formed in the inner surface of the element pipe 311a after groove forming process, and "processing precision of the groove" (the occurrence state of the digging).

Here, as shown in FIG. 11, in the grooving means 314, a material of a shape having a shape such that the fin 400 is cut out in the thickness direction at the base of the inner fin 400 is shown. The charging portion 401 is shown.

"Formation of the groove" is that the entire groove of the groove-forming plug 324 (filled groove of a predetermined depth) is set to "○", and that there is unfilled (the groove of the predetermined depth is not formed) Was evaluated as "△" or "x". "△" has been uncharged, but it is in the range which can be used practically. In addition, "the processing precision of a groove" is set as "(◎)" that there is no digging, or the digging depth (H _e ) is within 10% of the base width of the pin, and the digging depth (H _e ) is within 30% of the width of the base of the pin. Being "(circle)" and evaluation of what was 30% or more as "(triangle | delta)" or "x". "△" is a is in the range that can be used, but more than 30% of the pins butt width, practically scooped hollow depth (H _e).

Table 7 shows the results of processing performed for each condition of Examples 9 to 32 of the present invention.

As apparent from Table 7, all of Examples 9 to 32 of the present invention were any one of "(circle)", "(circle)", and "(triangle | delta)", and there was no "x". In particular, in Examples 11-18 and 23-25 of this invention, it became "(circle)" and "(circle)".

Specifically, as shown in Table 7, in the case of "formation of grooves", in the examples 9, 10, 21, 22 of the present invention, while "△", in the present invention examples 11-20, 23-32, "○" It became. From this result, it proved that the groove | channel of the inner surface can be formed to predetermined depth, when the process pitch P is made into 0.20 mm or more irrespective of the revolution direction of the process ball 326. As shown in FIG.

In addition, "the processing precision of a groove" became "(circle)" or "(circle)" in Examples 9-19 of this invention, compared with "(triangle | delta)" in Example 20 of this invention. From this result, it was demonstrated that when the processing pitch P is 0.70 mm or less when the revolving direction of the processing ball 326 is in the reverse direction, it is difficult to produce particularly a dent at the base of the inner surface pin.

In the case of the "machining precision of the groove", in the examples 26 to 32 of the present invention, it is "△", whereas in the examples 21 to 25 of the present invention, it becomes "○" or "◎". In the case where the revolving direction of) is the forward direction, it was proved that if the machining pitch P was 0.40 mm or less, particularly, it was difficult to generate a dent at the base of the inner surface pin.

In this way, if the depth of the pits is within 30% of the width of the base of the fin, there is no possibility that the inner surface of the fin collapses when the pipe is inserted into the aluminum fin of the heat exchanger performed in post-processing.

In view of the above, Examples 11 to 18 of the present invention and Examples 23 to 25 of the inner surface groove forming tube 311 are particularly suitable processing conditions among the examples of the present invention in terms of "formation of grooves" and "processing accuracy of grooves". It was able to demonstrate that processing is possible.

Specifically, the revolution direction of the machining ball 326 is set in the reverse direction, and the machining pitch P (mm) is set to be in a range of 0.2≤P≤0.7, or the revolution direction of the machining ball 326 is set in the forward direction. And the effectiveness of this invention characterized by setting processing pitch P (mm) so that it may become the range of 0.2 <= P <= 0.4 was demonstrated.

(Example 13)

In Example 13, the groove forming processing experiment which examines the influence on the process when the groove depth and torsion angle of the groove forming plug 324 were changed in the groove forming process was performed.

In this machining experiment, the machining pitch P of the machining ball 326 is set to 0.20 mm, 0.40 mm, and 0.60 mm in the case where the revolving direction of the machining ball 326 is the forward direction and the reverse direction, respectively. I changed it.

Further, in the processing performed in the processing experiment, primer tube (311a) the outer diameter (D ₀₎ using the base tube (311a) of the common dimensions are φ9.53 ㎜, and shaft diameter of the die diameter (D _2), floating-plug outside diameter (D a ₁ ), the outer diameter of the groove-forming plug 324, the number of grooves, the groove vertex angle, the number of the working balls 326, and the revolving speed were performed under the same conditions as those shown in Table 4 as in the tenth embodiment.

The processing result is as showing in Tables 8-10.

On the other hand, Table 9 and Table 10 show the groove depth and the torsion angle of the groove-forming plug 324 and the machining pitch P of the processing ball 326 when the orbiting directions of the processing ball 326 are forward and reverse directions, respectively. The results of experiments performed by changing the values are shown.

In addition, Table 8 shows the experimental result which extracted the processing conditions in Table 9, Table 10, and a part of the processing result.

On the other hand, similarly to Example 12, the processing results were verified with respect to the formation of the grooves and the machining accuracy of the grooves, and that all of these elements were "○" or "◎", and either "" or " "X" which did not include "x", and what included "(triangle | delta)" without having included "x" were evaluated comprehensively as "(triangle | delta)" as "(triangle | delta)".

On the other hand, as shown in Tables 8 to 10, also in the machining experiment in Example 13, the inner surface grooved tube (under the machining conditions satisfying the conditions of the present invention in which the axial diameter R _D is 30% or less). Because it processed 311), there was nothing "x".

In general, in the case of processing conditions in which deep grooves and large torsion angles are considered to be difficult, for example, when the groove depths are larger than 0.20 mm and the torsion angles are larger than 55 degrees, a large pulling force is required at the time of processing. Do.

As shown in Table 8, even when the groove depth of the groove-forming plug 324 is 0.22 mm and deeper than 0.20 mm, and the torsion angle is 60 degrees and larger than 55 degrees, the revolving direction of the processing ball 326 is the forward direction. Moreover, if the processing pitch was in the range of 0.20 mm-0.40 mm, the processing result became "(circle)" and it was possible to process (refer to * 1 column in Table 8).

From this result, even when the groove of the groove-forming plug 324 is deep and the machining with a large torsion angle is difficult, the revolving direction of the processing ball 326 is in the forward direction and 0.2 mm in which the processing pitch P does not become too large. If it was -0.4 mm, it was able to demonstrate that work was possible.

On the other hand, as shown in Table 8, even when the groove depth of the groove-forming plug 324 is 0.18 mm or 0.15 mm and smaller than 0.20 mm and the torsion angle is 50 degrees and smaller than 55 degrees, If the revolving direction was the reverse direction, all the processing results became "(circle)" regardless of the setting of the processing pitch P, and the processing was possible (refer to * 2 in Table 8).

From this result, when the groove depth of the groove-forming plug 324 is small and the torsion angle is small, at the same machining pitch P, the direction in which the machining ball 326 is in the reverse direction is compared with the case where it is in the forward direction. In this case, it was proved that the pitting was hardly generated on the inner surface of the fin, and even though it was small, the machining pitch P could be largely set to, for example, 0.6 mm.

In general, the larger the processing pitch P is, the faster the processing speed is and the productivity is improved. Therefore, when the machining ball 326 can be reversed in the revolving direction, the revolving direction of the processing ball 326 is reversed. It is preferable to process.

(Example 14)

In Example 14, the groove formation process experiment which examines the influence which the revolution speed R (rpm) of the processing ball 326 has on a process was performed.

Here, generally, the drawing speed at the time of the processing of the inner surface grooved pipe 311 is V (m / min), the revolution speed of the processing ball 326 is R (rpm), and the processing pitch of the processing ball 326 is represented. When P (mm) and the arrangement | positioning number of the processing ball 326 are set to C (piece | piece), drawing speed V (m / min) is V = R * P * C / 1000 ... It can be represented by Formula (1). This equation (1) shows that even if the revolution speed R (rpm) is changed, the machining pitch P (mm) can be kept constant by changing the drawing speed V (m / min) accordingly.

Therefore, in this machining experiment, drawing is performed such that the machining pitch of the machining ball 326 becomes constant in each case in which the revolution speeds of the machining ball 326 are 10000 rpm, 30000 rpm, and 40000 rpm, based on Equation (1). The speed V was set and the machining experiment similar to Example 12 and Example 13 was performed.

As a result, even if the revolution speed of the processing ball 326 was changed, if the processing pitch P was the same, it was the same result as Example 12 and Example 13.

As a result, if the processing pitch P is maintained in a predetermined range, it can be demonstrated that the same evaluation result can be obtained regardless of the difference in the revolution speed of the processing ball 326. The revolution speed of the machining ball 326 may be appropriately selected in consideration of the life of machining tools such as the machining ball 326 and the like.

(Example 15)

In Example 15, the groove formation process experiment which examines the influence of arrangement | positioning number C (piece) of the processing ball 326 was implemented.

Here, even if the arrangement | positioning number C (piece | piece) of the processing ball 326 is changed from the relationship of Formula (1), processing pitch P is changed by changing draw speed V (m / min) and revolution speed R (rpm) accordingly. (Mm) can be kept constant.

So, in Example 15, with respect to each case where the number of arrangement | positioning C of the processing ball 326 is three and five, drawing is carried out so that processing pitch P (mm) may be kept constant based on the relationship of Formula (1). The processing experiments similar to Example 12, Example 13, and Example 14 were implemented, setting the speed V (m / min) and the revolution speed R (rpm), respectively.

As a result, even if the number of arrangement | positioning of the processing ball 326 was changed, if the processing pitch P was the same, it was the same result as Example 12, Example 13, and Example 14.

As a result, if the processing pitch P was kept in the predetermined range, it could be proved that the same evaluation result could be obtained regardless of the difference in the arrangement number C (pieces) of the processing balls 326. What is necessary is just to select the arrangement | positioning number of the processing ball 326 suitably according to the inner surface groove forming pipe 311 to process.

In addition, in correspondence with Embodiment 3 mentioned above and the structure of this invention, the processing ball 326 of this embodiment corresponds to a pressing tool,

Shaft diameter processing unit 313 corresponds to the shaft diameter processing means,

The groove processing portion 314 corresponds to the groove processing means,

Although the intermediate drawing part 317 corresponds to the intermediate drawing device, the present invention is not limited to the configuration of the third embodiment, but can be implemented in many embodiments.

Embodiment 4A

Next, the manufacturing apparatus and manufacturing method of the inner surface grooved tube of Embodiment 4A are demonstrated using drawing.

510A of manufacturing apparatuses of the inner surface grooved tube in Embodiment 4A, as shown in FIG. 13, along the downstream side (drawing direction) from the upstream side of the tube axis direction X, the shaft diameter processing part 513 And a groove processing part 514, the diameter die 515, and the drawing part 516 (drawing part).

13 is explanatory drawing of the manufacturing apparatus 510A of the inner surface groove | channel formation tube in this embodiment.

In addition, the said manufacturing apparatus 510A is the process related data detection part 517 which detects the process related data regarding the process load which arises in a tube axis direction according to the drawing of the element pipe | tube 511a, and the said process related data, when a short pipe generate | occur | produces. The control unit 518 is configured to determine that short pipe has occurred on the basis of the processing-related data detected by the detection unit 517, and output a drawing stop command to the collecting unit 516.

The said shaft diameter processing part 513 is arrange | positioned in the shaft diameter die 522 and the floating pipe 511a, and is comprised by the floating plug 523 which diameter-reduces the small pipe 511a with the said shaft diameter dice 522. As shown in FIG.

The shaft diameter die 522 is configured in a cylindrical shape having a communication hole 522a communicated in the tube axis direction X, and the communication hole 522a defines an upstream side (inlet side) of the tube axis direction X. It is comprised by the shape which opened in the shape which the edge | tip widens gradually toward an upstream side with respect to a downstream part (outlet side).

The floating plug 523 has a cylindrical shape, and the outer circumference of the downstream portion has a tapered shape.

The groove processing portion 514 is rotatably connected to the floating plug 523 through a plug rod 525 in the element pipe 511a, the groove forming plug 524 having a plurality of grooves formed on an outer circumference thereof, A plurality of rolled balls 526 and rolled balls 526a which are arranged so as to revolve around the tube axis while pressing the pipe 511a toward the groove-forming plug 524 side from the outside of the pipe 511a and the rolled ball 526 are pipes 511a. The press jig 527 which presses to the side) is comprised.

The pressing jig 527 has a sharply angular conical inner circumferential surface enlarged toward the downstream side of the tube axis direction X, and has a ring-shaped processing head 528 that holds the rolling ball 526 from the outer circumferential side and downstream of the processing head. It is provided by the bearing 521 at the side, and is comprised by the ring-shaped press member 529 which gives a pressure with respect to each rolling ball 526. As shown in FIG.

The plurality of rolling balls 526 are held by the inner circumferential surface of the processing head 528 as a rolling tool capable of revolving while pressing the surface of the element pipe 511a in either the forward or reverse direction.

The said diameter die 515 carries out the process which smoothly corrects the distortion of the pipe surface etc. which were produced by the press of the rolling ball 526 in the said groove processing part 514, for example by the inner surface grooved pipe 511 passing. Do it.

The drawing unit 516 also has a drawing drum 531 (winding drum) for winding the finished inner surface groove forming tube 511 and includes a motor M ₁ for driving the drawing drum 531. By winding the motor M ₁ , the inner surface groove forming tube 511 is wound around the PS drum 531.

The machining-related data detection unit 517 is provided in the groove machining unit 514 and includes a grooving load measuring load cell 541 and a movable table 543 which measure the machining load in the groove machining part 514. Consists of.

The movable table 543 is comprised with the wheel at the lower part so that the movable table 543 is movable with respect to the fixing table 542, and the pressing jig 527 of the groove processing part 514 is provided in the upper part.

The grooving load measuring load cell 541 is provided in the fixed jig 542a so as to measure the machining load F in the tube axis direction X applied to the grooving part 514 via the movable table 543. have.

The control part 518 inputs the load detection signal S _{in which the} signal F detected from the grooving load measurement load cell 541 is electric-signaled, and at the time of short pipe generation according to a control program described later. , it is determined that the short pipe has occurred and outputs a motor (M ₁₎ stop signal (S _out) to stop the driving of the weight bride 516.

Although not shown, the control unit 518 includes an arithmetic unit (CPU) for executing signal analysis and arithmetic processing, a hard disk for storing necessary control programs, and a memory for temporarily storing the load detection signal S _in . In addition, an input means such as a keyboard for inputting control parameters and a display means such as a monitor can be appropriately provided.

Using the manufacturing apparatus 510A mentioned above, the inner surface grooved tube 511 can be manufactured by the manufacturing method demonstrated below.

First, the floating plug 523 and the groove-forming plug 524 rotatably connected to the floating plug 523 through the plug rod 525 are inserted into the canal 511a. The processing head 528 is rotated while passing the element pipe 511a through the shaft diameter die 522 and the processing head 528.

On the other hand, a metal tube with good thermal conductivity such as copper, its alloy, aluminum or its alloy can be used for the element pipe 511a.

The element pipe 511a is reduced in diameter by the shaft diameter die 522 and the floating plug 523 in accordance with the drawing. Subsequently, the plurality of rolling balls 526 rotating while rotating around the element pipe 511a at the position of the groove-forming plug 524 while rotating around the element pipe 511a press the element pipe 511a, thereby causing the element pipe 511a to be rotated. ), The inner circumferential surface is pressed against the surface of the groove-forming plug 524 to transfer the groove 550 of the circumferential surface of the groove-forming plug 524 to the inner surface of the conduit 511a.

As a result, the inner groove forming tube 511 having a plurality of fine grooves 510 on the inner surface having a lead angle β (see FIG. 13) of 40 to 60 degrees with respect to the tube axis can be formed. Thereafter, the inner surface groove forming tube 511 is diameter-fixed by the downstream diameter dice 515 and wound around the PS drum 531.

In the manufacturing process of the inner surface grooved tube, the control part 518 detects the process by the load cell 541 for grooving load measurement when a short pipe generate | occur | produces in the manufacturing process of the inner surface grooved tube 511 mentioned above. On the basis of the processing load F as the relevant data, it is determined that a short pipe has occurred, and control is performed to stop the processing.

Specifically, the control unit 518 determines that short pipe has occurred when the load detected by the grooving load measuring load cell 541 drops to 20% or less in normal normal processing, and the drawing unit 516 The control program for stopping the drive of the motor M ₁ is executed.

By the said manufacturing apparatus 510A, the following effect can be exhibited.

The said manufacturing apparatus 510A is a structure which can determine that a short pipe | tube generate | occur | produced based on the processing load F detected by the grooving load measurement load cell 541 with which the grooving part 514 was equipped, Even when a short pipe occurs on the upstream side of the die 515, in particular, on the grooved portion 514 or on the upstream side, it can be determined quickly and reliably.

Therefore, after the short pipe is generated, the breaking portion of the small pipe 511a passes through the groove processing portion 514, so that the rolling ball 526 presses the groove forming plug 524 directly without passing through the small pipe 511a, thereby forming the groove forming plug. 524 can be prevented from being broken.

The said manufacturing apparatus 510A performs control which determines that it is a short pipe | tube, when the process load F detected by the grooving load measurement load cell 541 falls to 20% or less of the process load at the time of normal normal processing. Is running. For this reason, when a load falls to a mechanical loss level, it can be judged as a short pipe.

Moreover, since it is set in consideration of the difference in the property between lots, and the fluctuation | variation by the environment difference, such as ambient temperature, it does not detect a short pipe | tube occurrence incorrectly.

Therefore, in the case of short pipe generation, it is possible to reliably detect the occurrence of short pipe and to manufacture a manufacturing apparatus excellent in production efficiency.

Moreover, the said process related data detection part 517 provides the groove processing part 514 to the movable stand 543, and loads the load of the tube axis direction X applied to the groove processing part 514, and the movable base 543. As shown in FIG. Since it is the structure detected by the grooving load measuring load cell 541 through (), the load in the tube-axis direction X applied to the grooving part 514 can be measured correctly.

Hereinafter, the manufacturing apparatus 510B, 510C of the inner surface grooved tube in another embodiment is demonstrated.

However, the same code | symbol is attached | subjected about the structure similar to the manufacturing apparatus 510A of the inner surface grooved tube in Embodiment 4A mentioned above among the structures of the manufacturing apparatus 510B, 510C of inner surface grooved tube demonstrated below, The description is omitted.

(Embodiment 4B)

As shown in FIG. 14, the manufacturing apparatus 510B of the inner surface grooved tube in Embodiment 4B is an axis diameter process part 513 and a groove process part along the downstream side from the upstream side of the tube axis direction X. As shown in FIG. 514, a scene die 515, and a drawing unit 516, and includes a processing-related data detection unit 545 and a control unit 546.

The machining-related data detector 545 is provided in the shaft diameter machining portion 513, and is composed of a shaft diameter machining load measurement load cell 545 for measuring the machining load F in the shaft diameter machining part 513. .

The load cell 545 for measuring the shaft diameter processing load is attached to the shaft diameter die 522 and can detect a load in the tube axis direction X that is loaded on the shaft diameter dice 522.

On the other hand, the manufacturing apparatus 510B of the inner surface grooved tube in Embodiment 4B does not include the grooving load measuring load cell 541 and the movable table 543 in the grooving part 514.

The control part 546 inputs the load detection signal S _{in which the} signal F detected from the load cell 545 for measuring the diameter-diameter processing load is input, and performs a short pipe detection according to a control program, and performs a short pipe. At the time of occurrence, determining that the short pipe resulting from the outputs of the motor (M ₁₎ stop signal (S _out) to stop the driving of the weight bride 516.

Specifically, the said control part 546 judges that it is a short pipe, when the processing load F detected by the shaft cell processing load measurement load cell 545 falls below 20% at the time of normal normal processing, and the drawing part 516 The control program for stopping the drive of the motor M _{1 of} the control panel ₁ is executed.

By the said manufacturing apparatus 510B, the following effect can be exhibited.

The said manufacturing apparatus 510B is a structure which determines that a short pipe generate | occur | produced based on the processing load F measured by the load cell 545 for shaft diameter processing load measurement with which the diameter diameter processing part 513 was equipped, Even when the short pipe occurs on the upstream side, the short pipe can be quickly and surely determined.

 In particular, in the manufacturing apparatus 510B, when a short pipe occurs downstream from the shaft diameter processing part 513, since the load applied to the shaft diameter processing part 513 becomes zero due to the addition of the small pipe at the same time as the short pipe generation, If a short pipe occurs, it can be determined immediately.

Therefore, the rolling ball 526 can press the groove forming plug 524 directly without passing through the element pipe 511a, and can prevent the groove forming plug 524 from being damaged.

(Embodiment 4C)

As shown in FIG. 15, as for the manufacturing apparatus of the inner surface grooved tube in Embodiment 4C, the shaft diameter process part 513 and the intermediate drawing part along the downstream side from the upstream side of the tube axis direction X. 551 (intermediate drawing part), grooving part 514, regular die 515, and drawing part 516, and is provided with a machining-related data detection part 552 and a control part 553.

15 is explanatory drawing of the manufacturing apparatus 510C of the inner surface grooved tube in Embodiment 4C.

The intermediate drawing part 551 assists the drawing by the drawing part 516 by drawing the element pipe 511a in the tube axis direction X between the shaft diameter processing part 513 and the groove processing part 514. have. That is, the grooving by the grooving portion 514 becomes a resistance at the time of drawing the element pipe 511a, and the load of drawing (drawing) at the time of grooving increases, but the grooving processing at the intermediate gripping portion 551 is performed. As a result, the load applied to the element pipe 511a is dispersed in the tube axis direction X, and as a result, the load applied to the groove processing portion 514 can be reduced.

The said intermediate drawing part 551 is equipped with the pair of belt 554 arrange | positioned at the upper and lower sides, or the left and right each side with respect to the element pipe | tube 511a. Each belt 554 is looped (endless) by the pulley 555, and is configured to be rotatable by the motor M ₂ . In the belt 554, a plurality of pads 556 are protruded along the longitudinal direction of the outer peripheral surface thereof.

Although not shown, the said pad 556 is an arc-shaped cutting surface with respect to the extending direction of the pad 556 in the contact part with the outer surface of the element pipe | tube 511a after being reduced by the shaft diameter processing part 513. As shown in FIG. A pad groove is formed.

Bride the intermediate weight 551, and is configured to be able to attach and slide the pad 556 by the driving of the motor (M ₃₎ to the surface of tube blank (511a) or, or retracted.

On the other hand, a wiper 557 for removing an oil film or foreign matter adhering to the outer surface of the element pipe 511a is provided on an upstream side of the intermediate drawing unit 551, and an intermediate diameter die 558 is provided on the downstream side. have.

The wiper 557 is provided to remove an oil film or foreign matter adhering to the outer surface of the element pipe 511a, and penetrates a diameter much smaller than the outer diameter of the element pipe 511a in order to pass the element pipe 511a. The hole is formed in, for example, a tubular body made of rubber.

The intermediate diameter die 558 is provided in order to return the cross-sectional shape of the flat element pipe | tube 511a to the shape near to a circle at the said intermediate drawing part 551, and according to the shape of the element pipe | tube 511a, the shaft diameter dice 522 is carried out. It is composed of a die diameter equal to or smaller than the diameter of.

The control part 553 can control the pressing force to the element pipe 511a by the pad 556 of the intermediate drawing part 551 by controlling the drive of the motor M _{3 of the} intermediate drawing part 551.

By pushing the pad 556 with an appropriate pressing force against the element pipe 511a, the slip between the pad 556 and the element pipe 511a is reduced, so that the variation in the load F is reduced.

The processing-related data detector 552 is an ammeter 552 that detects a current value (electrical signal) corresponding to the driving force command value to the motor M ₃ as a signal related to the driving force of the motor M ₃ of the intermediate drawing unit 551. Consists of

On the other hand, the manufacturing apparatus 510C does not include the grooving load measuring load cell 541 and the movable table 543 in the grooving portion 514, and the shaft diameter processing load measurement in the shaft diameter processing portion 513. The load cell 545 is not provided.

As described above, the control unit 553 includes a calculating unit for differentiating the current value detected by the ammeter 552, and has a storage unit for storing the differential value as load-related data. The control unit 553 determines that the derivative value is a short pipe when the derivative value is greatly changed beyond 5 s, which is a variation in normal processing, and the motor M ₁ of the drawing unit 516 and the motor of the intermediate drawing unit 551 ( A control program for outputting a PS stop command to M ₃ ) is provided.

The inner groove forming tube 511 can be manufactured using the manufacturing apparatus 510C mentioned above.

In the case where the element pipe 511a is broken, the control unit 553 determines that a short pipe has occurred based on the differential value of the current value detected by the ammeter 552, and stops processing.

Specifically, according to the manufacturing method of the inner surface groove forming tube 511, the amount of change of the derivative value which differentiated the electric current value detected by the ammeter 552 is measured, and when the change exceeds 5σ, it is judged as a short pipe, and the drawing part 516 The motor M _{1 of} ), the motor M ₂ of the intermediate drawing part 551, etc. are stopped.

By the said manufacturing apparatus 510C, the following effects can be exhibited.

The said manufacturing apparatus 510C can detect reliably, even if the short pipe | tube which generate | occur | produced upstream from the diameter die 515 before the grooved plug 524 is damaged.

In addition, since the manufacturing apparatus 510C can determine that a short pipe | tube has generate | occur | produced based on the differential value which differentiated the electric current value used as the command value of the motor load (driving force) of the intermediate drawing part 551, the intermediate drawing part 551 With the aid of the drawing assist, it is possible to quickly and surely detect the intermediate pipe 551 or the short pipe generated on the upstream side even under a large load variation.

Therefore, the rolling ball 526 can press the groove forming plug 524 directly without passing through the element pipe 511a, and can prevent the groove forming plug 524 from being damaged.

In addition, since the intermediate weight bride 551 based on a differential value of a current value corresponding to the load of the motor (M _2), it is determined that short pipe occurs configuration of the load cell and torque gauge, and further movable to install them Addition of hardware such as a stand is unnecessary, and short pipe detection can be performed by simple hardware such as the ammeter 552.

On the other hand, the manufacturing apparatus 510C of the inner surface grooved tube of Embodiment 4C is configured to detect a short pipe based only on the processing-related data detection unit 552 (ammeter 552) provided in the intermediate drawing unit 551. It is not limited.

Specifically, the manufacturing apparatus 510C is in addition to the above-described processing-related data detection unit 552, and the diameter machining is performed in the grooving load measurement load cell 541 and / or the shaft diameter machining part 513 in the grooving part 514. The load cell 545 for load measurement is provided, and the structure which detects short pipe generation in each site | part is not excluded.

(Example 16)

Subsequently, when a short pipe occurs in the elementary pipe 511a (inner surface grooved tube 511) during processing of the inner surface grooved tube 511 using the manufacturing apparatus of the present invention, the grooved plug 524 that is difficult to replace is A short pipe detection experiment was conducted to verify whether or not short pipe generation could be determined without breaking.

In this single-tube detection experiment, the manufacturing apparatus 510A, 510B, 510C of embodiment 4A-4C is used as a manufacturing apparatus of this invention, and also the comparative example of the manufacturing apparatus 510A, 510B, 510C of embodiment 4A-4C. It carried out using the manufacturing apparatus which concerns on a prior art as a.

In the manufacturing apparatus 510A, 510B, 510C of Embodiment 4A-4C, as mentioned above, all are more than the drawing part 516, specifically, it is a tube axis | shaft than the groove processing part 514 or this groove processing part 514. The processing load detection units 517, 545, 552 are appropriately provided on the upstream side in the direction X, and the processing load-related data detection is performed by the processing load detection units 517, 545, 552. Regarding the manufacturing apparatus 510A, 510B, 510C of embodiment 4A-4C, the presence or absence of the intermediate drawing part 551, the kind of the processing load detection part 517, 545, 552, and the processing load detection part 517, 545, 552 The installation site of is summarized as shown in Table 11, FIG. 16, FIG.

Middle PS
The presence or absence Machining load detector Machining load detector
Mounting site Embodiment 4A none Grooving Force Measuring Unit Grooving section Embodiment 4B none Shaft diameter load measurement Shaft diameter processing part Embodiment 4C has exist Load-related data detector Middle PS Comparative Example
(Prior Art) none PS use the load on the drum PS

In addition, Table 11 is a table | surface which shows the presence or absence of installation of the intermediate drawing part 551 of each manufacturing apparatus of embodiment 4A-4C, the kind of processing load detection part, and the installation site of the processing load detection part.

FIG. 16: is a schematic diagram of the manufacturing apparatus which did not install the intermediate drawing part, showing the installation site | part of the processing load detection part provided in each manufacturing apparatus of Embodiment 4A, 4B, and a comparative example. It is a schematic diagram of the manufacturing apparatus which shows the installation site | part of the processing load detection part installed in the manufacturing apparatus of Embodiment 4C, and is equipped with the intermediate drawing part.

On the other hand, as shown in Table 11 and FIG. 16, in the manufacturing apparatus of the comparative example, taking the configuration in which the intermediate drawing unit 551 is not provided as an example, the load of the motor of the drawing drum 531 is detected in the drawing unit 516. A load detector is provided (not shown), and the load detector detects a draw load, and when a short pipe is generated, it is determined that a short pipe has been generated.

In addition, as shown in FIG. 16, FIG. 17, the short pipe | tube generation site | part (henceforth "short pipe site | part") was made into nine site | parts of short pipe | tube parts ai.

The short pipe | tube parts a-d are as shown in FIG. 16, Specifically, the short pipe | tube part a is between the canonical dice 515 and the drawing part 516, and the short pipe | tube part b is the inside of a canon die | dye 515, or groove-processing. Between the part 514 and the diameter die 515, the short pipe part c is in the groove processing part 514 or between the shaft diameter processing part 513 and the groove processing part 514, and the short pipe part d is the shaft diameter processing part. 513 is between the payoff table 562 and the shaft diameter processing part 513 which supply the element pipe | tube 511a from the upstream of the inside of the shaft diameter processing part 513.

The short pipe | tube part e-i is as shown in FIG. 17, Specifically, the short pipe | tube part e is between the canonical dice 515 and the drawing part 516, and the short pipe | tube part f is the inside of a canon die | dye 515, or groove-processing. Between the part 514 and the diameter die 515, the short pipe part g is in the groove processing part 514 or between the intermediate drawing part 551 and the groove processing part 514, and the short pipe part h is the shaft diameter processing part. It is between 513 and the intermediate drawing part 551, and the short pipe | tube part i is between the shaft diameter processing part 513 or between the payoff table 562 and the shaft diameter processing part 513. As shown in FIG.

Based on the above, the short pipe | tube detection experiment in the case where short pipe generate | occur | produced in each site | piece of a short pipe | tube part a, b, c, and d using the manufacturing apparatus of a comparative example was carried out, respectively. , 0-d. The short pipe detection experiments in the case where short pipes occurred at the respective sites of the short pipe portions a, b, c, and d using the manufacturing apparatus 510A of the embodiment 4A, respectively, were performed. Let it be 1-d. A short tube detection experiment in the case where short pipes occur at each of the short pipe portions a, b, c, and d using the manufacturing apparatus 510B of the embodiment 4B is performed by the short pipe detection experiments 2-a, 2-b, 2-c, It is set as 2-d. A short tube detection experiment in the case where short tubes occur at each of the short pipe portions e, f, g, h, and i using the manufacturing apparatus 510C of the embodiment 4C, respectively. g, 3-h, 3-i.

The short pipe | tube detection control performed by the short pipe | tube detection experiment is demonstrated based on FIGS. 18-29.

18-29 are graphs showing the relationship graph of the processing load and time which the processing load detection part suitably installed in each processing part detects in each short pipe | tube detection experiment, and 100 second has passed since the measurement start. It is assumed that a short pipe occurred at one point.

In addition, since the device is stopped as soon as it is determined that the short pipe is generated after the short pipe detection, the subsequent load becomes zero. In FIGS. 18 to 29, in order to show the change of the load before and after the short pipe detection, the apparatus is actually mounted. Even if it stops, the waveform of the load is shown without stopping the apparatus even after the short pipe generation.

(Single tube detection experiment using the manufacturing apparatus of the comparative example)

In the manufacturing apparatus of the comparative example, as shown in Fig. 18~ 21, to a value reduced by a ratio of 20% relative to PS weight of the motor (M ₁₎ at the time of normal processing of the above-described PS drum 531 threshold The single pipe detection line is set.

18-21 shows the experimental result of the short pipe | tube detection experiment in 0-a, 0-b, 0-c, and 0-d, respectively.

The short pipe detection line can be determined that short pipe has occurred, and needs to be set within a range in which the short pipe is not misdetected.

Specifically, the drawing load of the drawing drum 531 fluctuates within the range of about ± 50 N in the processing time range of several hundred seconds level as shown in FIG. 18. If attention is paid to the processing time range of the hundreds of minutes between the beginning and the end of the lot, the PS drum 531 may be caused by factors such as difference in annealing state before and after the copper pipe, uneven thickness, and wear of the groove forming plug 524. There is more variation in the load.

In addition, the difference between the lot of copper pipe, the solid difference of the grooved plug 524, and the difference by seasonal variation are larger, for example, even in the normal processing before a short pipe generation, the drawing load of the PS drum 531 is about 1500 N to 3000 Fluctuates in the range of N;

Therefore, when the short pipe detection line serving as the threshold value of the short pipe detection is raised, false detection of short pipe generation increases. Therefore, the short pipe detection line needs to be set in a range where no false detection of the short pipe occurs.

The result of the short pipe | tube detection experiment 0-a is as showing in FIG. As shown in FIG. 18, until the short pipe is generated, the drawing load of the drawing drum 531 varies in the range during normal machining, but at the same time as the short pipe is generated, the drawing load of the motor M ₁ is lower than that of the short pipe detection line. Since the level is lowered to the loss level, the control section determines that the short pipe is generated at the same time as the short pipe generation, and stops the device to prevent the grooved plug 524 from being damaged by the rolling ball 526.

The result of the short pipe | tube detection experiment 0-b is as showing in FIG. As shown in FIG. 19, the drawing load of the drawing drum 531 drops at the same time as the occurrence of the short pipe, but not lower than that of the short pipe detection line (see point a of the load waveform in FIG. 19). In addition, since the drawing load of the drawing drum 531 falls to a mechanical loss level lower than that of the short pipe detection line, the control unit determines that the single pipe is short and stops the apparatus.

Thus, also in a short pipe | tube detection experiment 0-b, although the manufacturing apparatus of a comparative example can stop processing after a short pipe generation, there will be a slight delay from a short pipe generation until a short pipe generation is detected.

However, in the short pipe detection experiment 0-b, since the short pipe is generated at the short pipe portion b that is downstream from the groove processing portion 514, the break portion does not pass through the groove processing portion 514 having the groove forming plug 524. The device can be stopped before the grooved plug 524 is broken.

On the other hand, when the short pipe detection line is set higher than the load value (see point a of the load waveform in FIG. 19) which drops simultaneously with the occurrence of the short pipe, it is possible to detect the short pipe without delay before the break passes through the diameter die 515. On the other hand, as described above, as the drawing load fluctuates during processing due to various factors, misdetection of short pipe generation easily occurs, and processing efficiency is greatly reduced, which is not preferable.

The result of the short pipe | tube detection experiment 0-c is as showing in FIG. As shown in FIG. 20, at the same time as the occurrence of the short pipe, the drawing load of the drawing drum 531 drops, but each time the broken portion passes through the groove processing portion 514 and the diameter die 515, it breaks down stepwise and breaks. Until the additional diameter die 515 passes, the drawing load does not drop to a mechanical loss level lower than that of the short pipe detection line, and the control unit can determine that the short pipe has occurred until finally passing the diameter die 515. none.

Therefore, the short pipe occurs at the short pipe portion c that is upstream from the grooving portion 514, but it is determined that the short pipe is generated after the short pipe is generated, and there is a delay in the time taken to stop the apparatus. Through the grooving portion 514 having the additional grooved plug 524, the rolling ball 526 directly contacts the grooved plug 524, and as a result, the grooved plug 524 may be damaged. .

On the other hand, points a and b of the waveform of the drawing load in FIG. 20 indicate that the break portion is passing through the groove processing portion 514 and the diameter die 515, respectively.

The result of the short tube detection experiment 0-d is as shown in FIG. As shown in FIG. 21, similar to the short pipe detection experiment 0-c, at the same time as the short pipe is generated, the drawing load of the drawing drum 531 drops, but the broken portion is the shaft diameter processing portion 513, the groove processing portion 514, Each time it passes through the canonical die 515, it descends in steps, and the drawing load does not fall to the mechanical loss level lower than the short pipe detection line until it passes the canonical die 515, and the control unit finally It is not possible to determine that a short pipe has occurred until it passes 515).

Therefore, after the short pipe is generated, it is determined that the short pipe is generated, and there is a delay in the time taken until the device stops, and the grooved ball 526 contacts the grooved plug 524 in the meantime, so that the grooved plug 524 is broken. There is concern.

(Single tube detection experiment using the manufacturing apparatus of Embodiment 4A)

Subsequently, a short pipe detection experiment using the manufacturing apparatus 510A of the fourth embodiment will be described.

In the manufacturing apparatus 510A of Embodiment 4A, as a threshold value of short pipe | tube detection, it is set so that 20% of the measured load (processing load F) at the time of normal processing which the short pipe | tube detection line measured by the grooving load measuring part 517 can be. When it is set, when the measured load falls below the short pipe detection line, it is determined that the pipe is short, and control to stop the apparatus is performed.

The result of the short pipe | tube detection experiment 1-a is as showing in FIG. As shown in FIG. 22, since the measurement load of the grooving load measurement part 517 falls to zero which is lower than a short pipe detection line simultaneously with generation | occurrence | production of a short pipe, it can be determined that a short pipe generate | occur | produced immediately, The device can be stopped without breaking the grooved plug 524.

On the other hand, the measurement load drops to zero after the short pipe, when the short pipe occurs on the downstream side than the groove processing part 514, the drawing of the small pipe 511a by the drawing drum 531 simultaneously with the short pipe is generated by the groove processing part ( 514) until it does not work completely.

Similarly to the short pipe detection experiment 1-a, since the measurement load drops to zero at the same time as the short pipe detection experiment 1-a, the short pipe detection experiment can be performed immediately, without damaging the groove-forming plug 524. The device can be stopped.

On the other hand, since the measurement load of the grooving load measuring unit 517 in the short pipe detection experiment 1-b has a waveform substantially the same as that in Fig. 22, the graph showing the relationship between the machining load and the elapsed time is omitted.

The result of the short pipe | tube detection experiment 1-c is as showing in FIG. As shown in FIG. 23, the measurement load of the grooving load measuring unit 517 does not drop at the same time as the short pipe generation.

When the short pipe occurs in the short pipe part c upstream of the groove processing part 514, even if a short pipe occurs until the break part passes through the groove processing part 514, the element pipe 511a by the PS drum 531 This is because PS works to the groove processing part 514.

The short pipe portion passes through the groove processing portion 514 (see point a of the load waveform in FIG. 23), and immediately falls to zero lower than the short pipe detection line, and the control section determines that the short pipe has occurred, and stops the apparatus.

As described above, in the manufacturing apparatus 510A of the embodiment 4A, in the case of the short pipe portion c, the device cannot be stopped at the same time as the short pipe is generated, but it is determined that the short pipe is generated at the same time as the break portion passes through the groove processing portion 514, Since it can be stopped immediately, it is possible to prevent the grooved plug 524 from being damaged in advance.

Here, in the manufacturing apparatus of a comparative example, when a short pipe | tube generate | occur | produces in the short pipe | tube part c as described in short pipe | tube detection experiment 0-c, when a break part passes through the groove processing part 514 and passes through the diameter die | dye 515, It cannot be determined that short pipe has occurred until (see FIG. 20). That is, the rolling ball 526 is brought into contact with the groove-forming plug 524 for a few seconds between the break portion between the groove processing portion 514 and the diameter die 515 and through the inside diameter die 515. While the grooved plug 524 is broken.

On the other hand, in the manufacturing apparatus 510A of Embodiment 4A, when a short pipe generate | occur | produces in the short pipe part c, until a break part passes between the groove processing part 514 and the diameter die 515, and in the diameter die 515, Since the apparatus can be stopped more quickly than the manufacturing apparatus of the comparative example, it is possible to prevent the groove-forming plug 524 from contacting the rolling ball 526 and to be damaged.

Also in the short pipe detection experiment 1-d, as shown in FIG. 24, in the manufacturing apparatus 510A of Embodiment 4A, it cannot be determined that short pipe generate | occur | produced at the same time as short pipe generation, but a fracture | rupture part makes the shaft diameter processing part 513 work. Since the measured load of the grooving load measuring unit 517 drops to zero when passing through the grooving unit 514 (see the load waveform a point in FIG. 24), the grooving unit 514 It can be determined that a short pipe has occurred at the same time as the passage, and it is possible to prevent the grooved plug 524 from being damaged in the same manner as in the case of the short pipe detection experiment 1-c.

(Single tube detection experiment using the manufacturing apparatus of Embodiment 4B)

Subsequently, a short pipe detection experiment using the manufacturing apparatus 510B of Embodiment 4B will be described.

In the short pipe detection experiment 2-a, as in the short pipe detection experiment 1-a, the short pipe is generated downstream from the groove processing portion 514, so that the drawing of the small pipe 511a by the PS drum 531 is performed simultaneously with the short pipe generation. It does not work until the shaft diameter processing part 513.

For this reason, as shown in FIG. 25, since the measurement load falls to zero lower than a short pipe detection line, as shown in FIG. The device can be stopped without breaking the plug 524.

Similarly, since the measurement load drops to zero at the same time as the short pipe detection experiments 2-b and 2-c, the short pipe detection experiment can be immediately determined as short pipe generation, and the device is stopped without damaging the groove-forming plug 524. You can.

In addition, since the measurement load of the grooving load measurement part 517 in a single pipe | tube detection experiment 2-b, 2-c becomes a waveform substantially the same as that of FIG. 25, the graph which shows the relationship between a machining load and an elapsed time is abbreviate | omitted. do.

In the short pipe detection experiment 2-d, since the short pipe is generated at the short pipe portion d that is upstream from the shaft diameter processing portion 513, even if a short pipe occurs, the PS drum 531 until the break portion passes through the shaft diameter processing portion 513. The drawing of the element pipe 511a by this acts to the shaft diameter processing part 513.

For this reason, as shown in FIG. 26, the measurement load of the shaft diameter machining load measurement portion does not drop at the same time as the short pipe generation, but the fracture portion passes through the shaft diameter machining portion 513 and falls to zero lower than the short tube detection line. The controller determines that short pipe has occurred and stops the apparatus.

As described above, in the manufacturing apparatus 510B of the embodiment 4B, the apparatus cannot be stopped at the same time as the short pipe is generated, but it is determined that the short pipe is generated at the same time as the break portion passes the shaft diameter processing portion 513, and the break portion is the groove processing portion ( Since the device can be stopped before passing through 514, it is possible to prevent the grooved plug 524 from being broken.

(Single tube detection experiment using the manufacturing apparatus of Embodiment 4C)

Subsequently, a short pipe detection experiment using the manufacturing apparatus 510C of the embodiment 4C will be described.

In the manufacturing apparatus 510C of the fourth embodiment, as described above, the short pipe is determined based on the derivative value of the load of the motor M ₂ of the intermediate drawing unit 551.

Specifically, the amount of change (derivative value) of the load of the motor M ₂ of the intermediate drawing part 551 (the drawing load F of the intermediate drawing part 551) is monitored, and if the variation of the derivative value exceeds 5 sigma, It judges that it is, and the control which stops an apparatus is performed.

Here, the drawing load in the intermediate drawing part 551 is actually determined by various factors such as the elementary pipe 511a (copper pipe), the state of the apparatus, the difference in the processing environment, and the like as described above, even during normal processing. The amount of change increases.

For this reason, like the manufacturing apparatus 510C of Embodiment 4C, it is preferable at the point which can determine a short pipe accurately by detecting generation | occurrence | production of a short pipe using the derivative value of a drawing load.

The experimental result of short pipe | tube detection experiment 3-e is as showing in FIG.

On the other hand, Fig. 27 is a graph showing the drawing load and the load change amount (differential value) at the intermediate drawing part 551 before and after the short pipe generation, and the drawing load is the vertical axis on the left side in Fig. 27, and the change amount of the load is In FIG. 27, the right axis is the vertical axis.

In the short pipe detection experiment 3-e, the short pipe is generated on the downstream side than the groove processing part 514, but the load of the intermediate drawing part 551 increases, and the amount of change in the drawing load of the drawing drum is compared with that of the normal processing. To rise significantly. Therefore, it is judged that short pipe generate | occur | produced substantially at the same time as short pipe generation, and an apparatus can be stopped.

On the other hand, as shown in FIG. 27, there is no significant difference in the variation of the drawing load in the intermediate drawing unit 551 and the variation in the derivative value of the drawing load in the range of several hundred seconds level. In the range of the level, the variation of the drawing load in the intermediate drawing part 551 becomes large.

For this reason, by judging that a short pipe | tube generate | occur | produced based on the change amount (differential value) of the drawing load of the intermediate drawing part 551, it is possible to determine that a short pipe production | generation immediately and simultaneously with a short pipe | tube, without detecting a short pipe | tube, and a groove formation plug The device can be stopped without breaking 524.

Similarly to the short pipe detection experiment 3-e, the short pipe detection experiment 3-f and 3-g are also changed until the change amount (derivative value) of the drawing load of the intermediate drawing part 551 exceeds 5 sigma at the same time as the short pipe generation. As a result, the short pipe can be detected immediately, and as a result, the device can be stopped without damaging the groove-forming plug 524.

In addition, since the measurement load of the intermediate drawing part 551 in short pipe | tube detection experiment 3-f, 3-g becomes a waveform substantially the same as FIG. 27, the graph which shows the relationship between a processing load and elapsed time is abbreviate | omitted.

In the short pipe detection experiment 3-h, a short pipe is generated at the short pipe portion h that is upstream of the middle drawing part 551 or the middle drawing part 551. As shown in FIG. The amount of change (derived value) of the drawing load of 551 is changed until it exceeds 5 sigma, and it can be immediately judged as short pipe generation, and the apparatus can be stopped without damaging the groove-forming plug 524.

In short pipe detection experiment 3-i, as shown in FIG. 29, the load of the intermediate extraction part 551 and the amount of change (differential value) of the load do not fall simultaneously with the generation of the short pipe. Since the short pipe is generated at the short pipe portion i upstream of the shaft diameter machining portion 513, the impact pipe does not affect the extraction load of the intermediate drawing portion 551 until the break portion passes through the shaft diameter machining portion 513. to be.

However, while the breaking portion passes through the shaft diameter machining portion 513, and the change amount (differential value) of the load of the intermediate drawing portion 551 exceeds 5 s as in the short pipe detection experiment 3-h, it is determined that the short pipe is generated. It is possible to stop the apparatus without damaging the grooved plug 524.

According to the above-described short pipe detection experiment, in the manufacturing apparatus of the comparative example, the groove-forming plug 524 was pushed directly on the rolling ball 526 and was damaged depending on the short pipe generation site.

On the other hand, each manufacturing apparatus of Embodiments 4A to 4C judged that short pipes occurred during processing before the groove-forming plugs 524 were damaged by the rolling balls 526, and thus could stop the processing.

Therefore, it was able to demonstrate that the damage of the grooved plug 524 can be prevented by the manufacturing apparatus and manufacturing method of the inner surface grooved tube of this invention.

In addition, in correspondence with Embodiment 4 mentioned above and the structure of this invention, the shaft diameter processing part 513 of this embodiment corresponds to the shaft diameter means of this invention,

The groove processing portion 514 corresponds to the groove processing means,

The PS 516 corresponds to the PS means,

The intermediate PS 551 corresponds to the intermediate PS means,

The measured load measured by the machining related data detectors 517 and 545 or the current measured by the ammeter 552 correspond to the machining related data.

The process related data detection unit 517, 545, 552 corresponds to the process related data detection means,

Control units 518, 546, 553 provided with arithmetic unit and storage unit correspond to short pipe determination means,

The grooving load measuring load cell 541 corresponds to grooving load measuring means,

The load cell 545 for shaft diameter machining load measurement corresponds to the shaft diameter machining load measuring means,

The derivative value of the drawing load of the intermediate drawing part 551 corresponds to the load related data,

The calculating section of the ammeter 552 and the control section 553 corresponds to the load-related data detecting means, but the present invention is not limited to the configuration of the above-described embodiment 4, and can be implemented in many embodiments.

11: inner groove forming tube 12: manufacturing apparatus of inner groove forming tube
13: Shaft diameter part 14: Grooving part
16: drawing device 17: auxiliary drawing device
33: movable table 35: load cell
45 control device 50 fixed stand
101: device for manufacturing inner grooved tube 120: shaft reduction device
130: auxiliary feed device 140: groove processing device
160: winding drum 171: controller
176: calculator 182: upstream movable platform
184: full movable table 192: upstream load detector
194: full load detector 201: pipe
202: shaft diameter tube 204: inner groove forming tube
311: inner groove forming tube 311a: element pipe
312: manufacturing apparatus of inner grooved tube 313: shaft diameter means
314: groove processing means 317: intermediate drawing
322: shaft diameter die 323: floating plug
324: groove forming plug 326: machining ball
510A, 510B, 510C: manufacturing apparatus of inner grooved tube
511: inner groove forming tube 511a: element pipe
513: shaft processing part 514: groove processing part
516: PS
517, 545, 552: machining-related data detector
518, 546, 553: control unit 524: groove forming plug
541: load cell for grooving load measurement 551: intermediate drawing unit
P: working load

Claims (24)

delete delete delete delete In the manufacturing method of the inner surface grooved tube which uses the manufacturing apparatus of the inner surface grooved tube provided with the shaft diameter means which draws and shrinks an element pipe, and the groove processing means which forms many groove | channels in the inner tube inner surface. In
In the manufacturing apparatus of the said inner surface grooved tube,
Drawing means, which also serves as a winding drum for winding up the inner surface groove forming tube finished on the downstream side of the groove processing means, auxiliary drawing means for drawing a small pipe between the shaft reduction means and the groove processing means, the shaft reduction means, Support means for supporting the auxiliary drawing means and the groove processing means, the movable means being movable in the drawing direction with respect to the installation portion, load detection means for detecting a processing load acting in accordance with the movement of the movable means with respect to the installation portion; A control means for controlling the auxiliary drawing means based on the processing load detected by the load detecting means,
When the torsion angle of the groove with respect to the center axis of the tube is β (degrees), and the vertex angle of the pin formed between the adjacent grooves and the grooves is α (degrees), β is 30 to 60, and α is 5 to 20, When the outer diameter is D (mm), the depth of the groove is H (mm), and the cross-sectional area in the axial direction of the pipe is A _C (mm 2), D is 6 or less, H is 0.07 or more, and A _C <0.8 x D The processing load is P (N), the cross-sectional area with respect to the axial direction of the pipe after passing the grooving means is A _C1 (mm 2), and the breaking stress of the pipe after passing the grooving means is σ _M (N / mm 2). When we do,
And the auxiliary drawing means is controlled such that P is between 0.5 times and 0.9 times of (A _C1 × σ _M ). The manufacturing method of the inner surface grooved tube of Claim 5 whose outer diameter D (mm) is three or more. The method for producing an inner grooved tube according to claim 5 or 6, wherein the depth H (mm) of the grooves is 0.10 to 0.30. delete delete Using the manufacturing apparatus of the inner surface grooved tube provided with the shaft diameter means which pulls out a small pipe and reduces a diameter, and the groove processing means which forms many grooves in the inner pipe inner surface,
In the process of moving the primary pipe in the drawing direction, the shaft diameter machining step of shrinking the primary pipe and the groove processing step of forming a plurality of grooves in the inner tube inner surface are performed, and the shaft diameter processing step is performed while the shaft diameter processing step and the groove processing step are performed. Conducts an intermediate drawing process for drawing down the reduced tube in the
The shaft diameter processing step is performed with a shaft diameter die and a floating plug which is arranged in the element pipe and which diameter-adjusts the element pipe together with the axis diameter die,
The groove forming step is capable of revolving around the tube axis while pressing the elementary pipe to the grooved plug side on the outside of the elementary pipe, and a grooved plug rotatably connected to the floating plug in the elementary pipe and having a plurality of grooves formed on an outer circumference. As a manufacturing method of the inner surface grooved pipe | tube performed with the pressing tool arrange | positioned like this,
By the outer diameter D ₀ (mm) of the element pipe, the diameter D ₂ (mm) of the shaft diameter dies,
Axial diameter rate R _D (%) of the element pipe represented by R _D = {(D ₀ -D ₂ ) / D ₀ } × 100 (%) is set to R _D ≦ 30,
The inner surface of the groove forming process for producing a tube to the outer diameter D ₁ (㎜), the diameter D ₂ of the shaft diameter of the die (㎜) of the floating plug, to set so that the D ₁ -D ₂ ≥0.1. The rotation direction of the said pressing tool is set in the opposite direction to the rotation direction of the said grooved plug,
The manufacturing method of the inner surface grooved pipe | tube which sets the process pitch P (mm) of the said pressing tool so that it may become the range of 0.2 <= P <= 0.7. The rotation direction of the said pressing tool is set to the same direction as the rotation direction of the said grooved plug,
The manufacturing method of the inner surface grooved pipe | tube which sets the process pitch P (mm) of the said pressing tool so that it may become the range of 0.2 <= P <= 0.4. delete delete It is provided with the shaft diameter means which shrinks an element pipe, and forms a shaft diameter pipe, and the groove processing means which performs a groove processing on the inner surface of the shaft diameter pipe reduced,
The shaft diameter means, the groove processing means, and a drawing means for drawing the grooved inner surface groove forming tube in this order from the upstream side;
An apparatus for manufacturing an inner surface grooved tube, which is provided between the shaft diameter means and the groove processing means, and is provided with a transfer aid means for assisting the shaft diameter pipe in a conveying direction toward the groove processing means.
A movable table to which the shaft reduction means and the conveying auxiliary means are fixed and movable relative to the groove processing means in parallel with the drawing direction of the drawing means;
A movable table load detection device for detecting a load in the direction of the relative movement applied to the movable table when the movable table moves relative to the groove processing means;
An expectation that the groove processing means is fixed and relatively movable relative to the drawing means in parallel with the drawing direction,
An expected load detection device for detecting a load in the direction of the relative movement applied to the base when the base is moved relative to the drawing means;
A control means for controlling the operation of the transfer aid means;
The movable table is configured to be relatively movable in the drawing direction with respect to the base,
The control means,
Based on the load detected by at least one of the said moving stage load detection apparatus and the said expected load detection apparatus, the feed assistance speed adjustment process which adjusts the feed assistance speed of the said feed assistance means, and the feed assistance torque of the said feed assistance means are carried out. The manufacturing apparatus of the inner surface grooved pipe | tube made into the structure which performs at least one of the feed auxiliary torque adjustment process to adjust. The said feed assistance speed in the said feed assistance speed adjustment process is made into the 1st feed assistance speed,
The manufacturing apparatus of the inner surface grooved pipe | tube which made the said feed assistance torque adjustment process into the adjustment process which adjusts with the 2nd feed assistance speed determined based on the correlation with the said feed assistance torque. Shaft reduction means for reducing the small pipe to form a shaft pipe,
It is provided with the grooving means which performs a grooving on the inner surface of the reduced diameter diameter pipe,
Along the drawing direction of the element pipe, the shaft diameter means and the groove processing means are provided, and between the shaft diameter means and the groove processing means, an intermediate drawing portion for drawing the element pipe reduced in the shaft diameter means is provided,
The shaft diameter means comprises a shaft diameter die and a floating plug disposed in the elementary pipe and configured to reduce the elementary pipe together with the shaft diameter die,
The groove forming means is rotatably connected to the floating plug in the element pipe, and has a groove forming plug having a plurality of grooves formed on an outer circumference thereof, and revolves around the tube axis while pressing the element pipe to the groove forming plug side outside the element pipe. As a manufacturing apparatus of the inner surface grooved tube comprised by the pressing tool arrange | positioned possibly,
By the outer diameter D ₀ (mm) of the element pipe, the diameter D ₂ (mm) of the shaft diameter dies,
The shaft diameter ratio R _D (%) of the element pipe represented by R _D = {(D ₀ -D ₂ ) / D ₀ } × 100 (%) is set to R _D ≦ 30 in the shaft diameter means,
The outer diameter D ₁ (㎜), the manufacturing apparatus of the diameter D ₂ (㎜) of the shaft diameter of the die, D ₁ -D ₂ in the inner surface groove formed in one set so that ≥0.1 tube of the floating plug. The rotation direction of the said pressing tool is set in the opposite direction to the rotation direction of the said grooved plug,
The manufacturing apparatus of the inner surface grooved pipe | tube which set the process pitch P (mm) of the said pressing tool so that it may become the range of 0.2 <= P <= 0.7. The rotational direction of the said pressing tool is set to the same direction as the rotation direction of the said grooved plug,
The manufacturing apparatus of the inner surface grooved pipe | tube which set the process pitch P (mm) of the said pressing tool so that it may become the range of 0.2 <= P <= 0.4. In the manufacturing apparatus of the inner surface grooved tube provided with the shaft diameter means which diameter-reduces an element pipe, and forms a shaft diameter tube, and the groove processing means which performs a groove process on the inner surface of the shaft diameter tube which was reduced in diameter,
Processing-related data detection for detecting processing-related data relating to processing loads generated in the tube-axis direction in accordance with the drawing of the element pipe and drawing means for drawing the inner surface grooved tube which has been processed on the downstream side in the tube-axis direction of the groove-processing means. The manufacturing apparatus of the inner surface groove | channel formation pipe | tube provided with a means in the tube axial direction upstream rather than the said drawing means. 21. The shaft processing load measuring means according to claim 20, wherein the processing-related data detecting means measures the processing load in the grooving load measuring means for measuring the working load in the grooving means and the shaft diameter means. The manufacturing apparatus of the inner surface grooved tube formed among at least one side of them. 22. The apparatus according to claim 20 or 21, further comprising an intermediate drawing means for drawing element pipes between the shaft reduction means and the groove processing means,
The manufacturing apparatus of the inner surface grooved tube which comprises the said process related data detection means by the load related data detection means which detects the load related data concerning the drawing load of the motor of the said intermediate drawing means. 22. The inner grooved tube according to claim 20 or 21, further comprising end pipe judging means for judging that a short pipe has occurred based on the process related data detected by said process related data detecting means. Manufacturing device. Using the manufacturing apparatus of the inner surface grooved tube of Claim 23,
A method for manufacturing an inner surface grooved tube according to the processing-related data detected by the processing-related data detecting means, wherein the single-tube determination means determines that a short pipe has occurred, and stops processing.

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