JP2010274264A - Apparatus and method for manufacturing internally grooved tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for manufacturing an internally grooved tube, capable of determining occurrence of any tube breakage during the machining before a grooved plug provided on a grooved section is broken by a form rolling ball, and reliably preventing any breakage of the grooved plug. <P>SOLUTION: Each of the apparatuses 10A, 10B, 10C for manufacturing the internally grooved tube comprises a contraction means 13 by which a tube stock 11a is reduction-worked, and contracted, a groove machining means 14 for forming a large number of grooves in an inner surface of the tube stock after passing the contraction means 13, and a reduction working means 16 for reduction-working the internally grooved tube 11 worked on the downstream side in the tube axial direction X of the groove machining means 14. Work-related data detection means 17, 45, 52 which detect the work-related data on the machining load generated in the tube axial direction X as the tube stock 11a is reduction-worked, are provided on the upper-stream side in the tube axial direction X from the reduction working means 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an apparatus and a method for manufacturing an internally grooved tube used as a heat transfer tube for a heat exchanger of an air conditioner or a water heater.

A heat transfer tube used for a heat exchanger of an air conditioner or a water heater is often a copper tube with a groove on the inner surface because of the requirement for heat exchange performance.
In recent years, in particular, thinner inner-surface grooved tubes for heat transfer tubes have been demanded in order to reduce the weight of heat exchangers and save metal resources.

  A manufacturing apparatus and a manufacturing method of an internally grooved tube for manufacturing such an internally grooved tube are disclosed in Patent Document 1.

  The manufacturing apparatus for an internally grooved tube of Patent Document 1 includes a drawing unit that also serves as a take-up drum (drawing drum) that winds a processed internally grooved tube on the most downstream side in the drawing direction. A pulling force detecting means for detecting a pulling force for pulling out the grooved tube is provided.

  The drawing force is detected by a device that measures the torque based on the motor current value of the drawing means, the relationship between the pushing force and displacement of the pipe in the drawing means, reduces the diameter of the raw pipe other than the winding drum, and performs grooving. This is done by measuring the load on the mounted movable table.

  For example, when detecting by the motor torque of the drawing means, it is determined that the tube is disconnected when the motor torque drops to the mechanical loss level.

  The pulling force detection means in Patent Document 1 measures the pulling force corresponding to the tension applied to the tube immediately before the drawing drum.

  Here, the pulling force detection means can be detected immediately when a tube break occurs during processing, and when the tube break is immediately before the drawing means (between the diameter adjusting die and the drawing drum). .

  However, the pull-out force detecting means is a case where a tube breakage occurs during processing, and when the broken portion is upstream from the diameter adjusting die, the tube is adjusted until the broken portion passes the diameter adjusting die. As the pull-out load applied when passing through the die is detected, the load fluctuation is suppressed, and the detection of the broken tube is delayed.

  As described above, in the related art, when a disconnection occurs upstream of the diameter adjusting die, the stop of the apparatus is delayed due to a delay in detecting the disconnection, and the grooved plug may be damaged.

  When the broken part of the tube passes through the grooved part, the grooved plug provided in the grooved part is pressed directly against the rolled ball, and the grooved plug may be damaged. Since the grooved plug is expensive, if the apparatus is not stopped immediately after the disconnection occurs, it is necessary to replace the grooved plug every time the disconnection occurs, resulting in a great cost and labor.

JP 2008-87004 A

  Therefore, in the present invention, it is possible to determine that a tube break has occurred during processing before the grooved plug provided in the groove processing portion is damaged by the rolled ball, and it is possible to reliably prevent the grooved plug from being damaged. An object is to provide a manufacturing apparatus and a manufacturing method of an internally grooved tube.

  The present invention relates to a diameter reducing means for drawing and reducing the diameter of an element pipe, a groove processing means for forming a large number of grooves on the inner surface of the element pipe after passing through the diameter reducing means, and a downstream side in the tube axis direction of the groove processing means. The inner grooved pipe manufacturing apparatus includes a drawing means for drawing the processed inner grooved pipe at the upstream side in the pipe axis direction with respect to the drawing means in the pipe axis direction. It is the manufacturing apparatus of the inner surface grooved pipe provided with the processing related data detecting means for detecting the processing related data regarding the processing load generated in the above.

  With the above configuration, it is possible to detect machining-related data related to the machining load generated in the pipe axis direction as the pipe is drawn, so that the pipe breaks on the upstream side in the pipe axis direction from the drawing means based on the machining-related data. Even so, it can be recognized that the disconnection has occurred before the grooved plug provided in the groove processing means is broken.

  Therefore, it is possible to quickly take measures such as stopping the apparatus, and it is possible to prevent the grooved plug from being pressed directly against the rolled ball in the groove processing means and being damaged.

  The processing related data is, for example, the load related data related to the processing load measured in the diameter reducing means or the groove processing means, or the drawing load of the intermediate drawing means, in other words, the motor load (driving force). Can be mentioned. Further, the machining-related data may be data such as a current value or a voltage value obtained by converting a machining load or a driving force into an electrical signal, or a differential value obtained by differentiating these values. The tendency shown by the graphed waveform may be used.

  Further, the present invention provides the machining-related data detection means, a grooving load measuring means for measuring the machining load in the grooving means, and a reduced diameter processing load measuring means for measuring the machining load in the reduced diameter means. Of these, at least one is configured.

When the machining-related data detection means is configured by the grooving load measuring means, it can be determined that a disconnection has occurred based on the change in the machining load at the grooving means.
When the processing-related data detection means is constituted by the reduced diameter processing load measuring means, it can be determined that a disconnection has occurred based on a change in the processing load at the reduced diameter means.

  For this reason, even when a sizing die is installed on the downstream side of the groove processing portion, the grooved plug is not affected by any delay in the determination of the occurrence of disconnection in either the groove processing means or the diameter reducing means. The occurrence of disconnection can be recognized before it breaks.

  In particular, when the processing-related data detection means is configured by the diameter reducing load measuring means, the disconnection occurred even when a disconnection occurs between the groove processing means and the diameter reducing means. Is preferable in that it can be determined instantaneously.

  Further, in both the groove machining means and the diameter reducing means, for example, a predetermined ratio before the machining load drops to the level of mechanical loss such as 20% with respect to the machining load during normal steady machining, for example. If it changes to, it can be judged as a disconnection.

  The present invention further includes an intermediate drawing means for drawing an element pipe between the diameter reducing means and the groove processing means, and the processing related data detection means is related to a drawing load of a motor of the intermediate drawing means. It is characterized by comprising load-related data detecting means for detecting load-related data.

  By providing the intermediate drawing means, it is possible to assist the drawing of the raw pipe by the drawing means, while the load variation on the diameter reducing means and the groove processing means tends to be large. Based on the load-related data detected by the related data detecting means, it can be recognized that the disconnection has occurred, and the grooved plug can be prevented from being damaged.

  Furthermore, since the load-related data related to the drawing load (motor load) of the intermediate drawing means is detected and used for recognizing the disconnection, load measuring means such as a load cell and a torque gauge, Since no hardware such as a jig for installing the load measuring means is required, the disconnection detection can be easily performed using existing equipment.

  In this case, since the drawing load itself of the intermediate drawing means always changes during the processing by the control, it may be difficult to recognize the occurrence of the broken tube. If a differential value or a difference value of the load is used, it is preferable in that the occurrence of the disconnection can be surely recognized because a significant variation is exhibited when the disconnection occurs.

  When the differential value of the drawing load is used as the load-related data, the disconnection determining means, for example, the standard deviation (σ) in the distribution with a variation that causes the differential value of the drawing load to occur even during normal steady machining. If it fluctuates greatly exceeding a predetermined width, such as 5 times (5σ), it can be determined that the tube is broken.

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

  Furthermore, the load-related data is not limited to the motor load, but may be a motor torque. In addition, the load-related data may include a transmission mechanism such as a pulley or a belt that is movable by the motor load of the intermediate drawing means. There is no particular limitation as long as it is data related to the motor load of the intermediate drawing means, including the angular) speed, the (angular) acceleration speed, or these differential values.

  Further, the present invention is characterized by comprising a disconnection determining means for determining that a disconnection has occurred based on the processing related data detected by the processing related data detecting means.

  The disconnection determination means can automatically determine that a disconnection has occurred based on the processing related data detected by the processing related data detection means. Therefore, it is possible to reliably stop and prevent breakage of the grooved plug.

  Furthermore, in the present invention, it is determined by the disconnection determining means that the disconnection has occurred on the basis of the processing related data detected by the processing related data detecting means, using the manufacturing apparatus of the inner surface grooved pipe. The method for producing an internally grooved tube that stops processing is characterized by the following.

  With the above configuration, it is automatically determined that a disconnection has occurred based on the processing-related data detected by the processing-related data detection means, and if it is determined that a disconnection has occurred, the grooved plug provided in the grooving portion is damaged. Since machining can be stopped before, the grooved plug can be reliably prevented from being damaged.

  In the present invention, it is possible to determine that a tube break has occurred during processing before the grooved plug provided in the groove processing portion is damaged by the rolling ball, and it is possible to reliably prevent the grooved plug from being damaged. A manufacturing apparatus and a manufacturing method of an internally grooved tube can be provided.

Sectional drawing which shows the manufacturing apparatus of the inner surface grooved pipe | tube of 1st Embodiment. Sectional drawing which shows the manufacturing apparatus of the inner surface grooved pipe of 2nd Embodiment. Sectional drawing which shows the manufacturing apparatus of the internally grooved pipe | tube of 3rd Embodiment. Sectional drawing explaining the installation location of the process load detection part installed in each manufacturing apparatus of 1st, 2nd embodiment and a prior art. Sectional drawing explaining the installation location of the process load detection part installed in the manufacturing apparatus of 3rd Embodiment. The figure which showed the fluctuation of the processing related data before and after the occurrence of the disconnection in the form of a graph showing the state of the occurrence of the disconnection in the manufacturing apparatus of the comparative example. The figure which showed the fluctuation of the processing related data before and after the occurrence of the disconnection in the form of a graph showing the state of the occurrence of the disconnection in the manufacturing apparatus of the comparative example. The figure which showed the fluctuation of the processing related data before and after the occurrence of the disconnection in the form of a graph showing the state of the occurrence of the disconnection in the manufacturing apparatus of the comparative example. The figure which showed the fluctuation of the processing related data before and after the occurrence of the disconnection in the form of a graph showing the state of the occurrence of the disconnection in the manufacturing apparatus of the comparative example. The figure which showed the change of processing related data before and after the occurrence of a disconnection in the form of a graph showing the state of the occurrence of a disconnection in the manufacturing apparatus of the first embodiment. The figure which showed the change of processing related data before and after the occurrence of a disconnection in the form of a graph showing the state of the occurrence of a disconnection in the manufacturing apparatus of the first embodiment. The figure which showed the change of processing related data before and after the occurrence of a disconnection in the form of a graph showing the state of the occurrence of a disconnection in the manufacturing apparatus of the first embodiment. The figure which showed in a graph the fluctuation | variation of the process related data before and after the occurrence of a disconnection in the state of occurrence of the disconnection in the manufacturing apparatus of the second embodiment. The figure which showed in a graph the fluctuation | variation of the process related data before and after the occurrence of a disconnection in the state of occurrence of the disconnection in the manufacturing apparatus of the second embodiment. The figure which showed the change of the processing related data before and after the occurrence of a disconnection in the form of a graph showing the state of the occurrence of a disconnection in the manufacturing apparatus of the third embodiment. The figure which showed the change of the processing related data before and after the occurrence of a disconnection in the form of a graph showing the state of the occurrence of a disconnection in the manufacturing apparatus of the third embodiment. The figure which showed the change of the processing related data before and after the occurrence of a disconnection in the form of a graph showing the state of the occurrence of a disconnection in the manufacturing apparatus of the third embodiment.

An embodiment of the present invention will be described below with reference to the drawings.
(First embodiment)
As shown in FIG. 1, the inner grooved tube manufacturing apparatus 10 </ b> A according to the first embodiment extends from the upstream side in the tube axis direction X to the downstream side (the drawing direction), and the diameter reducing portion 13 and the groove processing portion 14. The diameter adjusting die 15 and the drawing part 16 (drawing part) are configured.
In addition, FIG. 1 is explanatory drawing of the manufacturing apparatus 10A of an internally grooved pipe | tube in this embodiment.

  Further, the manufacturing apparatus 10A includes a machining-related data detection unit 17 that detects machining-related data related to a machining load that occurs in the pipe axis direction along with the drawing of the raw tube 11a, and, when a disconnection occurs, the machining-related data detection. It is determined that a disconnection has occurred based on the processing related data detected by the unit 17, and a control unit 18 that outputs a drawing stop command to the drawing unit 16 is provided.

  The reduced diameter processing portion 13 includes a reduced diameter die 22 and a floating plug 23 that is disposed in the raw tube 11 a and reduces the diameter of the raw tube 11 a together with the reduced diameter die 22.

  The diameter-reducing die 22 is formed in a cylindrical shape having a communication hole 22a communicating in the tube axis direction X, and the communication hole 22a has an upstream portion (inlet side) in the tube axis direction X as a downstream portion (outlet side). ) With respect to the upstream side.

  The floating plug 23 is formed in a cylindrical shape, and the outer periphery of the downstream portion is formed in a tapered shape.

  The groove processing portion 14 is rotatably connected to the floating plug 23 via a plug rod 25 in the raw tube 11a, and has a grooved plug 24 having a plurality of grooves formed on the outer periphery, and an outer side of the raw tube 11a. In FIG. 4, a plurality of rolling balls 26 arranged to revolve around the tube axis while pressing the raw tube 11a toward the grooved plug 24, and a pressing treatment for pressing the rolled ball 26 toward the raw tube 11a. It consists of the tool 27.

  The pressing jig 27 has a conical inner peripheral surface with a steep angle expanded toward the downstream side in the tube axis direction X, a ring-shaped processing head 28 that holds the rolling ball 26 from the outer peripheral side, and a processing head. And a ring-shaped pressing member 29 that applies pressure to each rolling ball 26.

  The plurality of rolling balls 26 are held by the inner peripheral surface of the processing head 28 as a rolling tool that can revolve while pressing the surface of the raw tube 11a in either the forward direction or the reverse direction. .

  When the inner diameter grooved tube 11 passes, the diameter adjusting die 15 performs, for example, a process of smoothly adjusting a diameter of a tube surface caused by pressing of the rolling ball 26 in the groove processing portion 14.

The drawing unit 16, combines the drawing drum 31 for winding the processed of the inner surface grooved tube 11 (winding drum), a motor M ₁ for driving the drawing drum 31, inner grooved by the rotation of the motor M ₁ The drawing tube 31 is wound around the drawing drum 31 while being pulled.

  The machining-related data detection unit 17 includes a groove machining load measurement load cell 41 that measures a machining load in the groove machining unit 14 and a movable base 43 provided in the groove machining unit 14.

The movable table 43 is configured to have a wheel at the lower part so as to be movable in the tube axis direction X with respect to the fixed table 42, and a pressing jig 27 for the groove processing portion 14 is installed at the upper part.
The groove machining load measurement load cell 41 is installed on the fixing jig 42a so as to be able to measure the machining load F in the tube axis direction X applied to the groove machining portion 14 via the movable platform 43.

The control unit 18, determines that the input load detection signal S _in which the electrical signal of the load F detected from grooving load measuring load cell 41, according to control programs that will be described later, when the cross-sectional tubes occurred, the cross-sectional tubes occurred It outputs a stop signal _{S out} to stop driving of the motor _{M 1} of the drawing portion 16 and.

The control unit 18 is illustrated without the signal analysis processing and arithmetic processing operation machine for executing the (CPU), a hard disk for storing the necessary control program, and temporarily stores the load detection signal S _in In addition, an input unit such as a keyboard for inputting control parameters and a display unit such as a monitor can be appropriately provided.

  The inner grooved tube 11 can be manufactured by the manufacturing method described below using the manufacturing apparatus 10A described above.

First, a floating plug 23 and a grooved plug 24 rotatably connected to the floating plug 23 via a plug rod 25 are inserted into the raw tube 11a. The processing head 28 is rotated while the raw tube 11 a is pulled out through the reduced diameter die 22 and the processing head 28.
Note that a metal tube having good thermal conductivity such as copper, an alloy thereof, aluminum or an alloy thereof can be used for the raw tube 11a.

  The raw tube 11a is reduced in diameter by the reduced diameter die 22 and the floating plug 23 along with the drawing. Next, a plurality of rolling balls 26 revolving around the base tube 11a as the machining head 28 rotates at the position of the grooved plug 24 presses the base tube 11a, so that the inside of the base tube 11a. The circumferential surface is pressed against the surface of the grooved plug 24, and the groove 50 on the circumferential surface of the grooved plug 24 is transferred to the inner surface of the raw tube 11a.

  As a result, it is possible to form an internally grooved tube 11 having a large number of fine grooves 10 having a lead angle β (see FIG. 1) of 40 to 60 degrees with respect to the tube axis on the inner surface. Thereafter, the inner grooved tube 11 is adjusted in diameter by the downstream diameter adjusting die 15 and wound around the drawing drum 31.

  In the manufacturing process of the inner surface grooved tube, the control unit 18 processes the processing load F as the processing related data detected by the load cell 41 for measuring the groove processing load when a disconnection occurs in the manufacturing process of the inner surface grooved tube 11 described above. Based on the above, it is determined that a disconnection has occurred, and control is performed to stop machining.

Specifically, the control unit 18 determines that a disconnection has occurred when the load detected by the load cell 41 for measuring the grooving load decreases to 20% or less during normal steady machining, and the motor M ₁ of the drawing unit 16 determines that the disconnection has occurred. A control program for stopping driving is executed.

The following effects can be achieved by the manufacturing apparatus 10A.
10 A of said manufacturing apparatuses are the structures which can determine with the pipe breakage having generate | occur | produced based on the processing load F detected by the load cell 41 for groove processing load measurement with which the groove processing part 14 was equipped, upstream from the diameter adjustment die 15, In particular, even when a disconnection occurs at the groove processing portion 14 or upstream thereof, it can be quickly and reliably determined that the disconnection has occurred.

  Therefore, when the broken portion of the raw tube 11a passes through the groove processing portion 14 after the occurrence of the broken tube, the rolling ball 26 directly presses the grooved plug 24 without passing through the raw tube 11a, and the grooved plug 24 Can be prevented from being damaged.

  10 A of said manufacturing apparatuses are performing control which determines that it is a disconnection, if the processing load F detected with the load cell 41 for groove processing load measurement falls to 20% or less of the processing load at the time of normal steady processing during processing. For this reason, it can be determined that the tube is broken when the load drops to the mechanical loss level.

  Furthermore, since it is set in consideration of variations due to differences in properties between rods and environmental differences such as ambient temperature, the occurrence of disconnection is not erroneously detected.

  Therefore, when disconnection occurs, the occurrence of disconnection can be reliably detected, and a manufacturing apparatus excellent in production efficiency can be manufactured.

  Further, the machining-related data detection unit 17 installs the groove machining unit 14 on the movable table 43, and loads the load in the tube axis direction X applied to the groove machining unit 14 via the movable table 43 to the groove machining load measurement load cell 41. Therefore, the load in the tube axis direction X applied to the groove machining portion 14 can be accurately measured.

Below, the manufacturing apparatus 10B, 10C of the inner surface grooved pipe | tube in other embodiment is demonstrated.
However, among the configurations of the inner grooved tube manufacturing devices 10B and 10C described below, the same reference numerals are given to the same configurations as the inner grooved tube manufacturing device 10A in the first embodiment described above. The description is omitted.

(Second Embodiment)
As shown in FIG. 2, the inner surface grooved pipe manufacturing apparatus 10 </ b> B according to the second embodiment includes a diameter reducing portion 13, a groove processing portion 14, and a diameter adjusting die, from the upstream side to the downstream side in the tube axis direction X. 15, the drawing unit 16 is configured, and a processing related data detection unit 45 and a control unit 46 are provided.
The machining-related data detection unit 45 includes a reduced-diameter machining load measurement load cell 45 that is provided in the reduced-diameter machining unit 13 and that measures a machining load F in the reduced-diameter machining unit 13.
The diameter reduction load measuring load cell 45 is attached to the diameter reduction die 22 and can detect the load in the tube axis direction X applied to the diameter reduction die 22.

  In addition, the inner surface grooved tube manufacturing apparatus 10B according to the second embodiment does not include the groove processing load measurement load cell 41 and the movable base 43 in the groove processing portion 14.

The control unit 46 is input load F detected from diameter reduction load measuring load cell 45 is an electrical signal of the load detection signal S _in, in accordance with a control program, performs detection of the disconnection tube, when the cross-sectional tubes occurred, the cross-sectional tube outputs a stop signal S _out to stop driving of the motor M ₁ of the drawing unit 16 determines to have occurred.

Specifically, the control unit 46 determines that the tube is disconnected when the processing load F detected by the load cell 45 for measuring the reduced diameter processing load is reduced to 20% or less during normal steady machining, and determines the motor M ₁ of the drawing unit 16. A control program for stopping driving is executed.

The manufacturing apparatus 10B can provide the following operational effects.
The manufacturing apparatus 10 </ b> B is configured to determine that a disconnection has occurred based on the processing load F measured by the diameter reducing processing load measuring load cell 45 provided in the diameter reducing processing unit 13, and upstream of the diameter adjusting die 15. Even when a disconnection occurs on the side, it can be quickly and reliably determined that the disconnection has occurred.

  In particular, in the manufacturing apparatus 10B, when a tube break occurs on the downstream side of the reduced diameter processing portion 13, the load applied to the reduced diameter processing portion 13 becomes zero due to the drawing of the raw tube simultaneously with the occurrence of the disconnection, It can be immediately determined that a disconnection has occurred.

  Therefore, it is possible to prevent the rolling ball 26 from directly pressing the grooved plug 24 without passing through the raw tube 11a, and the grooved plug 24 from being damaged.

(Third embodiment)
As shown in FIG. 3, the inner grooved tube manufacturing apparatus 10 </ b> C according to the third embodiment extends from the upstream side to the downstream side in the tube axis direction X, and the diameter reducing portion 13, the intermediate drawing portion 51 (intermediate drawing portion). ), A grooving section 14, a diameter adjusting die 15, and a drawing section 16, and a processing related data detection section 52 and a control section 53.
In addition, FIG. 3 is explanatory drawing of the manufacturing apparatus 10C of an internally grooved pipe | tube in 3rd Embodiment.

  The intermediate drawing portion 51 assists the drawing by the drawing portion 16 by drawing the raw tube 11 a in the tube axis direction X between the reduced diameter portion 13 and the groove processing portion 14. That is, the grooving by the grooving section 14 becomes a resistance when the raw pipe 11a is drawn, and a load of drawing (drawing) at the time of the grooving increases. However, the intermediate drawing section 51 applies to the raw pipe 11a. The drawing load is dispersed in the tube axis direction X, and as a result, the load applied to the groove processing portion 14 can be reduced.

The intermediate drawing portion 51 includes a pair of belts 54 arranged on the upper and lower sides or the left and right sides of the raw tube 11a. Each belt 54 is stretched by the pulley 55 in a loop shape (endless) is configured to be rotated by the motor M _2. The belt 54 has a plurality of pads 56 connected to the outer peripheral surface along the length direction.

  Although not shown, the pad 56 is formed with a pad groove in which the cut surface with respect to the connecting direction of the plurality of pads 56 has an arcuate shape at the contact portion with the outer surface of the base tube 11a after the diameter reduction by the diameter reducing portion 13. is doing.

The intermediate drawing unit 51 pressed against the pad 56 to the base pipe 11a surface by driving of the motor M _3, or are retractably configuration.
A wiper 57 for removing the oil film and foreign matter adhering to the outer surface of the raw pipe 11a is provided on the upstream side of the intermediate drawing portion 51, and an intermediate diameter adjusting die 58 is provided on the downstream side.

The wiper 57 is provided to remove an oil film and foreign matter adhering to the outer surface of the raw tube 11a, and a through hole having a diameter slightly smaller than the outer diameter of the raw tube 11a is passed through the raw tube 11a. For example, a rubber cylindrical body formed in the central portion.
The intermediate diameter adjusting die 58 is provided to return the cross-sectional shape of the element tube 11a flattened by the intermediate drawing portion 51 to a shape close to a perfect circle, and the diameter of the diameter reducing die 22 is changed according to the shape of the element tube 11a. It is configured with the same or smaller die diameter.
The control unit 53, by controlling the driving of the motor M ₃ of the intermediate drawing unit 51, it is possible to control the pressing force by the pad 56 of the intermediate drawing portion 51 with respect to base pipe 11a.
By pressing the pad 56 against the raw tube 11a with an appropriate pressing force, the slip between the pad 56 and the raw tube 11a is reduced, and the fluctuation of the load F is reduced.

The processing related data detection unit 52 is an ammeter 52 that detects a current value (electric signal) corresponding to a 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 51. It is composed.
The manufacturing apparatus 10 </ b> C does not include the groove processing load measurement load cell 41 or the movable base 43 in the groove processing portion 14, and does not include the diameter reduction processing load measurement load cell 45 in the diameter reduction processing portion 13. .

Further, as described above, the control unit 53 includes a calculation unit that differentiates the current value detected by the ammeter 52 and includes a storage unit that stores the differential value as load-related data. Further, the control unit 53, when the differential value varies significantly beyond 5σ variations of steady state processing, determines that the cross tube, the motor M ₁ of the drawing unit _16, the motor M ₃ of the intermediate drawing portion 51 A control program for outputting a drawing stop command is provided.

The internally grooved tube 11 can be manufactured using the manufacturing apparatus 10C described above.
In the control part 53, when the elementary tube 11a breaks, it determines with the disconnection having occurred based on the differential value which differentiated the electric current value detected with the ammeter 52, and performs a process stop.
Specifically, according to the method of manufacturing the inner surface grooved tube 11, the amount of change in the differential value obtained by differentiating the current value detected by the ammeter 52 is measured, and when the fluctuation exceeds 5σ, it is determined that the tube is broken. 16 motor _{M 1} of, stops the apparatus, such as a motor _{M 2} of the intermediate drawing unit 51.

With the manufacturing apparatus 10C, the following operational effects can be achieved.
The manufacturing apparatus 10 </ b> C can reliably detect a broken tube generated upstream of the diameter adjusting die 15 before the grooved plug 24 is damaged.

  Furthermore, since the manufacturing apparatus 10C can determine that the disconnection has occurred based on the differential value obtained by differentiating the current value that is the command value of the motor load (driving force) of the intermediate drawing unit 51, the intermediate drawing unit 51C. Even under a situation where the load fluctuation is large due to the drawing assistance of the part 51, the intermediate drawing part 51 or the disconnection that has occurred on the upstream side can be detected quickly and reliably.

  Therefore, it is possible to prevent the rolling ball 26 from directly pressing the grooved plug 24 without passing through the raw tube 11a, and the grooved plug 24 from being damaged.

Furthermore, based on the differential value of the current value corresponding to the load of the motor M ₂ of the intermediate drawing unit 51, since it is determined configuration to the cross-sectional tubes occurred, the load cell and torque gauge, further, for installing these It is not necessary to add hardware such as a movable table, and for example, disconnection can be detected by simple hardware such as the ammeter 52.

In addition, 10 C of inner surface grooved pipe manufacturing apparatuses of 3rd Embodiment are not restricted to the structure which detects a disconnection based only on the said process related data detection part 52 (ammeter 52) with which the intermediate | middle drawing part 51 was equipped.
Specifically, in addition to the processing-related data detection unit 52, the manufacturing apparatus 10 </ b> C includes a groove processing load measurement load cell 41 in the groove processing unit 14 and / or a diameter reduction processing load measurement load cell 45 in the diameter reduction processing unit 13. It does not exclude the structure which detects breakage generation | occurrence | production at each location.

(Example)
Subsequently, when a tube breakage occurs in the raw tube 11a (inner surface grooved tube 11) during the processing of the inner surface grooved tube 11 using the manufacturing apparatus of the present invention, the grooved plug 24 which is difficult to substitute is not damaged. An experiment for detecting the disconnection was conducted to verify whether or not the occurrence of the disconnection can be determined.
In this disconnection detection experiment, the manufacturing apparatuses 10A, 10B, and 10C of the first to third embodiments are used as the manufacturing apparatus of the present invention, and the manufacturing apparatuses 10A, 10B, and 10C of the first to third embodiments are compared. As an example, a manufacturing apparatus according to the prior art was used.

  In the manufacturing apparatuses 10A, 10B, and 10C according to the first to third embodiments, as described above, all of them are more detailed than the drawing unit 16, more specifically the groove processing unit 14, or the tube processing direction than the groove processing unit 14. The processing load detection units 17, 45, and 52 are appropriately provided on the X upstream side, and the processing load detection units 17, 45, and 52 detect processing load related data. Table 1 summarizes the presence / absence of installation of the intermediate drawing unit 51, the types of processing load detection units 17, 45, 52, and the installation location of the intermediate drawing unit 51 for the manufacturing apparatuses 10A, 10B, and 10C of the first to third embodiments. As shown in FIGS.

なお、表１は、第１から第３実施形態の各製造装置の中間抽伸部５１の設置の有無、加工荷重検出部の種類、中間抽伸部の設置箇所を示す表である。
図４は、第１、第２実施形態、比較例の各製造装置に設置する加工荷重検出部の設置箇所を示し、中間抽伸部を設置していない製造装置の模式図である。図５は、第３実施形態の製造装置に設置する加工荷重検出部の設置箇所を示し、中間抽伸部を設置している製造装置の模式図である。

In addition, Table 1 is a table | surface which shows the presence or absence of the installation of the intermediate drawing part 51 of each manufacturing apparatus of 1st to 3rd embodiment, the kind of process load detection part, and the installation location of an intermediate drawing part.
FIG. 4 is a schematic diagram of a manufacturing apparatus in which the machining load detection unit installed in each manufacturing apparatus of the first, second embodiment, and comparative example is shown, and the intermediate drawing unit is not installed. FIG. 5 is a schematic diagram of a manufacturing apparatus in which an intermediate drawing unit is installed, showing an installation location of a processing load detection unit installed in the manufacturing apparatus of the third embodiment.

  On the other hand, as shown in Table 1 and FIG. 4, in the manufacturing apparatus of the comparative example, a configuration in which the intermediate drawing unit 51 is not installed is taken as an example, and a load detector that detects the load of the motor of the drawing drum 31 on the drawing unit 16. (Not shown), the drawing load is detected by the load detector, and when a broken tube is generated, it is determined that the broken tube has been generated.

Moreover, the disconnection generation | occurrence | production location (henceforth "the disconnection location") was made into nine places of the disconnection location a to i as shown in FIG. 4, FIG.
The disconnection points a to d are as shown in FIG. 4. Specifically, the disconnection point a is between the diameter adjusting die 15 and the drawing part 16, and the disconnection point b is within the diameter adjusting die 15. Or it is between the groove processing part 14 and the diameter adjustment die 15, and the disconnection part c is in the groove processing part 14 or between the diameter reduction processing part 13 and the groove processing part 14, and the disconnection part d is , Between the payoff table 62 and the diameter reduction processing section 13 for supplying the raw tube 11a in the diameter reduction processing section 13 or from the upstream side of the diameter reduction processing section 13.

  The disconnection points e to i are as shown in FIG. 5. Specifically, the disconnection point e is between the diameter adjusting die 15 and the drawing portion 16, and the disconnection point f is within the diameter adjusting die 15. Or it is between the groove processing part 14 and the diameter adjusting die 15, and the disconnection part g is in the groove processing part 14 or between the intermediate drawing part 51 and the groove processing part 14, and the disconnection part h is Between the reduced diameter processing portion 13 and the intermediate drawing portion 51, the disconnection point i is in the reduced diameter processing portion 13 or between the payoff table 62 and the reduced diameter processing portion 13.

  Based on the above, the disconnection detection experiments 0-a, 0-b are respectively performed when the disconnection occurs at each of the disconnection locations a, b, c, d using the manufacturing apparatus of the comparative example. , 0-c, 0-d. The disconnection detection experiments 1-a, 1-b, 1b, and 1b are respectively performed when the disconnection occurs at each of the disconnection points a, b, c, d using the manufacturing apparatus 10A of the first embodiment. 1-c and 1-d. The disconnection detection experiment 2-a, 2-b, and the disconnection detection experiment when the disconnection occurs at each of the disconnection locations a, b, c, and d using the manufacturing apparatus 10B of the second embodiment. Let 2-c and 2-d. Using the manufacturing apparatus 10C of the third embodiment, the disconnection detection experiments when the disconnection occurs at each of the disconnection locations e, f, g, h, i are shown as the disconnection detection experiments 3-e, 3- Let f, 3-g, 3-h, 3-i.

The disconnection detection control performed in the disconnection detection experiment will be described with reference to FIGS.
FIGS. 6 to 17 are graphs showing the relationship between the machining load and time detected by the machining load detection unit provided appropriately for each machining unit in each disconnection detection experiment, both from the start of measurement. It is assumed that a disconnection has occurred after 100 seconds.

  Furthermore, since the apparatus is stopped as soon as it is determined that a disconnection has occurred after the detection of the disconnection, the subsequent load becomes zero. However, in FIGS. 6 to 17, the change in the load before and after the disconnection is detected. In order to show the situation, a waveform of a load in a state where the apparatus is not stopped even after the apparatus is actually stopped is shown.

(A disconnection detection experiment using the manufacturing apparatus of the comparative example)
In the manufacturing apparatus of the comparative example, as shown in FIG. 6 to FIG. 9, the threshold value is a value that is reduced by a ratio of 20% with respect to the drawing load of the motor M ₁ at the time of steady processing of the drawing drum 31 described above. Set to tube detection line.
6 to 9 show experimental results of the disconnection detection experiments in the disconnection detection experiments 0-a, 0-b, 0-c, and 0-d, respectively.

The disconnection detection line needs to be set within a range where it is possible to determine that the disconnection has occurred and to prevent erroneous detection of the disconnection.
Specifically, the drawing load of the drawing drum 31 fluctuates within a range of about ± 50 N within a machining time range of several hundred seconds as shown in FIG. Paying attention to the machining time range of several hundred minutes between the beginning and the end of the lot, the load on the drawing drum 31 is further increased due to the difference in the annealing state before and after the copper pipe, uneven thickness, wear of the grooved plug 24, etc. There will be fluctuations.

  Furthermore, the difference between the lots of copper pipes, the difference in the solid difference of the grooved plug 24 and the difference due to the seasonal variation is much larger. For example, the drawing load of the drawing drum 31 is about It fluctuates in the range of 1500N to 3000N.

  For this reason, if the disconnection detection line is increased as a threshold for disconnection detection, erroneous detection of the occurrence of disconnection increases. Therefore, it is necessary to set the disconnection detection line within a range in which erroneous detection of disconnection does not occur.

The result of the disconnection detection experiment 0-a is as shown in FIG. As shown in FIG. 6, until the cross-sectional tubes occurred, drawing load drawing drum 31, will be shifted in the range of steady state processing, simultaneously with the cross tube occurs, drawing load of the motor M ₁ is than the cross tube detection line Since the mechanical loss level is lowered to a low mechanical loss level, the control unit determines that the disconnection has occurred simultaneously with the occurrence of the disconnection, and can stop the grooved plug 24 from being damaged by the rolled ball 26 by stopping the apparatus.

  The result of the disconnection detection experiment 0-b is as shown in FIG. As shown in FIG. 7, the drawing load of the drawing drum 31 drops at the same time as the disconnection occurs, but does not fall below the disconnection detection line (see point a of the load waveform in FIG. 7), At the same time as passing through the sizing die 15, the drawing load of the drawing drum 31 is lowered to a mechanical loss level lower than the disconnection detection line. Therefore, the control unit determines that the disconnection has occurred and stops the apparatus.

  Thus, also in the disconnection detection experiment 0-b, the manufacturing apparatus of the comparative example can stop processing after the occurrence of the disconnection, but there is a slight delay between the occurrence of the disconnection and the detection of the disconnection. Become.

  However, in the disconnection detection experiment 0-b, since the disconnection occurs at the disconnection location b that is downstream of the groove processing portion 14, the fracture portion passes through the groove processing portion 14 having the grooved plug 24. And the device can be stopped before the fluted plug 24 breaks.

  If the disconnection detection line is set higher than the load value that drops simultaneously with the occurrence of the disconnection (see point a of the load waveform in FIG. 7), the fracture occurs before the fractured portion passes through the sizing die 15. However, as described above, as the drawing load fluctuates during processing due to various factors, false detection of disconnection is likely to occur, and processing efficiency is greatly reduced. It is not preferable.

  The result of the disconnection detection experiment 0-c is as shown in FIG. As shown in FIG. 8, the drawing load of the drawing drum 31 drops simultaneously with the occurrence of the broken tube, but drops step by step every time the fractured portion passes through the groove processing portion 14 and the diameter adjusting die 15, and the fractured portion Until the diameter passes through the sizing die 15, the drawing load does not drop to a mechanical loss level lower than the disconnection detection line, and the control unit determines that the rupture has occurred until it finally passes through the sizing die 15. I can't.

  Therefore, the disconnection occurs at the disconnection location c that is upstream of the groove processing portion 14, but it is determined that the disconnection has occurred after the occurrence of the disconnection, and there is a delay in the time required to stop the apparatus. Therefore, during this time, the rupture portion passes through the groove processing portion 14 having the grooved plug 24 and the rolling ball 26 directly contacts the grooved plug 24, so that the grooved plug 24 may be damaged.

  Note that points a and b in the waveform of the drawing load in FIG. 8 indicate that the fracture portion is passing through the groove processing portion 14 and the diameter-controlling die 15, respectively.

  The result of the disconnection detection experiment 0-d is as shown in FIG. As shown in FIG. 9, the drawing load of the drawing drum 31 is lowered at the same time as the occurrence of the broken tube, as in the broken tube detection experiment 0-c, but the fracture portion is the reduced diameter processing portion 13, the groove processing portion 14, Each time it passes through the sizing die 15, it descends stepwise, and until it passes through the sizing die 15, the drawing load does not drop to a mechanical loss level lower than the disconnection detection line. It is not possible to determine that a disconnection has occurred until 15 is passed.

  Therefore, it is determined that the disconnection has occurred after the occurrence of the disconnection, and there is a delay in the time required to stop the apparatus. During this time, the rolling ball 26 contacts the grooved plug 24, and therefore the grooved plug 24 may be damaged. There is.

(A disconnection detection experiment using the manufacturing apparatus of the first embodiment)
Next, a disconnection detection experiment using the manufacturing apparatus 10A of the first embodiment will be described.
In the manufacturing apparatus 10A of the first embodiment, the disconnection detection line is set as 20% of the measurement load (processing load F) at the time of steady processing measured by the grooving processing load measuring unit 17 as a threshold for detecting the disconnection. When the measured load falls below the disconnection detection line, it is determined that the disconnection has occurred, and control is performed to stop the apparatus.

  The result of the disconnection detection experiment 1-a is as shown in FIG. As shown in FIG. 10, the measurement load of the grooving load measuring unit 17 is determined that the disconnection has occurred immediately because the measurement load drops to zero lower than the disconnection detection line simultaneously with the occurrence of the disconnection. Yes, the device can be stopped without damaging the fluted plug 24.

  Note that the measured load drops to zero after the disconnection when the disconnection occurs on the downstream side of the groove processing portion 14 and when the tube 11a is drawn by the drawing drum 31 simultaneously with the disconnection, the groove processing portion. This is because it does not work completely up to 14.

Similarly to the disconnection detection experiment 1-a, the disconnection detection experiment 1-b can detect the disconnection immediately because the measurement load drops to zero simultaneously with the occurrence of the disconnection. The device can be shut down without damaging 24.
In addition, since the measurement load of the groove processing load measurement part 17 in the disconnection detection experiment 1-b has substantially the same waveform as that in FIG. 10, a graph showing the relationship between the processing load and the elapsed time is omitted.

The result of the disconnection detection experiment 1-c is as shown in FIG. As shown in FIG. 11, the measurement load of the grooving load measurement unit 17 does not drop simultaneously with the occurrence of the broken tube.
This is because, when a disconnection occurs at a disconnection point c that is upstream of the groove processing portion 14, even if the disconnection occurs until the fracture portion passes the groove processing portion 14, the raw pipe by the drawing drum 31 It is because the drawing of 11a acts to the groove processing part 14. FIG.

  At the same time that the broken tube portion passes through the groove processing portion 14 (see point a of the load waveform in FIG. 11), the controller falls to zero, which is lower than the broken tube detection line, and the control unit determines that a broken tube has occurred. Then stop the device.

  As described above, in the manufacturing apparatus 10A of the first embodiment, in the case of the disconnection location c, the apparatus cannot be stopped simultaneously with the occurrence of the disconnection, but the disconnection occurred at the same time as the fractured portion passed the groove processing portion 14. Since the apparatus can be immediately stopped, it is possible to prevent the grooved plug 24 from being damaged.

  Here, in the manufacturing apparatus of the comparative example, as described in the disconnection detection experiment 0-c, when the disconnection occurs at the disconnection location c, the fracture portion passes through the groove processing portion 14, and further the diameter adjusting die. It is not possible to determine that a disconnection has occurred until it passes 15 (see FIG. 8). That is, the rolling ball 26 comes into contact with the grooved plug 24 for several seconds while the fracture portion passes between the groove processing portion 14 and the diameter adjusting die 15 and passes through the diameter adjusting die 15. The grooved plug 24 will be damaged.

  On the other hand, in the manufacturing apparatus 10A of the first embodiment, when the disconnection occurs at the disconnection point c, the fracture portion is between the groove processing part 14 and the diameter-controlling die 15 than the manufacturing apparatus of the comparative example, and Since the apparatus can be stopped as soon as it passes through the sizing die 15, it is possible to prevent the grooved plug 24 from coming into contact with the rolling ball 26 and being damaged.

  Also in the disconnection detection experiment 1-d, as shown in FIG. 12, in the manufacturing apparatus 10A of the first embodiment, it cannot be determined that the disconnection has occurred simultaneously with the occurrence of the disconnection, but the fracture portion has a reduced diameter. When passing through the processing section 13 and passing through the grooving section 14, the measurement load of the grooving load measuring section 17 drops to zero (refer to point a in the load waveform in FIG. 12). At the same time, it can be determined that the disconnection has occurred, and the grooved plug 24 can be prevented from being damaged in the same manner as in the disconnection detection experiment 1-c.

(A disconnection detection experiment using the manufacturing apparatus of the second embodiment)
Subsequently, a disconnection detection experiment using the manufacturing apparatus 10B of the second embodiment will be described.
In the disconnection detection experiment 2-a, similar to the disconnection detection experiment 1-a, a disconnection is generated on the downstream side of the grooving portion 14. Therefore, the drawing drum 31 is drawn by the drawing drum 31 simultaneously with the disconnection. It does not work up to the reduced diameter processed portion 13.

  For this reason, as shown in FIG. 13, the measurement load of the reduced diameter processing load measurement unit drops to zero at the same time as the disconnection occurs, and the measured load drops to zero, which is lower than the disconnection detection line. The determination can be made, and the apparatus can be stopped without damaging the grooved plug 24.

Similarly, in the disconnection detection experiments 2-b and c, since the measurement load drops to zero simultaneously with the occurrence of the disconnection, it can be immediately determined that the disconnection has occurred, and the grooved plug 24 is not damaged. The device can be stopped.
In addition, since the measurement load of the groove processing load measurement part 17 in the disconnection detection experiment 2-b and c becomes a waveform substantially the same as FIG. 13, the graph which shows the relationship between a processing load and elapsed time is abbreviate | omitted.

  In the disconnection detection experiment 2-d, since the disconnection occurs at the disconnection location d that is upstream of the diameter reduction processing portion 13, the fracture portion passes through the diameter reduction processing portion 13 even if the disconnection occurs. Up to this point, the drawing of the tube 11a by the drawing drum 31 acts up to the reduced diameter processing portion 13.

  For this reason, as shown in FIG. 14, the measurement load of the reduced diameter processing load measuring portion does not drop at the same time as the occurrence of the disconnection, but is lower than the disconnection detection line at the same time as the broken portion passes the reduced diameter processing portion 13. The controller descends to zero, and the control unit determines that a disconnection has occurred and stops the apparatus.

  Thus, in the manufacturing apparatus 10B of the second embodiment, the apparatus cannot be stopped at the same time as the occurrence of the disconnection, but it is determined that the disconnection has occurred at the same time that the fracture portion passes through the reduced diameter processing portion 13, and the fracture portion Since the apparatus can be stopped before passing through the grooved portion 14, it is possible to prevent the grooved plug 24 from being damaged.

(A disconnection detection experiment using the manufacturing apparatus of the third embodiment)
Next, a disconnection detection experiment using the manufacturing apparatus 10C of the third embodiment will be described.
In the manufacturing apparatus 10C of the third embodiment, the cross-sectional tube a differential value of the load of the motor M ₂ of the intermediate drawing unit 51 based on is determined to have occurred as described above.
For more information, monitors the load of the motor M ₂ of the intermediate drawing unit 51 changes the amount of (drawing load F of the intermediate drawing portion 51) (differential value), the variation of the differential value is determined as the cross-sectional tube Once beyond the 5Shiguma, device The control which stops is performed.

  Here, the drawing load in the intermediate drawing unit 51 is actually due to various factors such as the state of the raw pipe 11a (copper pipe) before processing, the state of the apparatus, and the processing environment, even during steady machining. The amount of change increases.

  For this reason, it is preferable at the point which can determine a disconnection correctly by detecting the disconnection generation | occurrence | production using the differential value of a drawing load like the manufacturing apparatus 10C of 3rd Embodiment.

The experimental result of the disconnection detection experiment 3-e is as shown in FIG.
FIG. 15 is a graph showing the drawing load at the intermediate drawing unit 51 before and after the occurrence of the broken tube and the amount of load change (differential value). The drawing load is represented by a load on the left side in FIG. As for the amount of change, the right side in FIG.

  In the disconnection detection experiment 3-e, a disconnection occurs downstream of the groove processing portion 14, but this increases the load of the intermediate drawing portion 51, and the amount of change in the drawing load of the drawing drum is the same as that during steady processing. It is remarkable compared. Therefore, it can be determined that the disconnection has occurred substantially simultaneously with the occurrence of the disconnection, and the apparatus can be stopped.

  As shown in FIG. 15, when viewed in the range of several hundred seconds, there is no great difference between the variation of the drawing load in the intermediate drawing unit 51 and the variation of the differential value of the drawing load. If it sees in the range of a minute level, the fluctuation | variation of the drawing load in the intermediate drawing part 51 will become large.

  For this reason, it is determined that the disconnection has occurred based on the amount of change (differential value) of the drawing load of the intermediate drawing unit 51, so that the disconnection is immediately generated simultaneously with the disconnection without erroneously detecting the disconnection. The determination can be made, and the apparatus can be stopped without damaging the grooved plug 24.

  Similarly to the disconnection detection experiment 3-e, the disconnection detection experiment 3-f, g also changes until the amount of change (differential value) of the drawing load of the intermediate drawing unit 51 exceeds 5σ at the same time as the occurrence of the disconnection. The disconnection can be detected immediately, and the apparatus can be stopped without damaging the grooved plug 24.

  In addition, since the measurement load of the intermediate | middle drawing part 51 in the disconnection detection experiment 3-f, g becomes a waveform substantially the same as FIG. 15, the graph which shows the relationship between a process load and elapsed time is abbreviate | omitted.

  In the disconnection detection experiment 3-h, a disconnection occurs in the intermediate drawing unit 51 or at a disconnection point h that is upstream of the intermediate drawing unit 51. As shown in FIG. At the same time, the amount of change (differential value) in the drawing load of the intermediate drawing portion 51 changes until it exceeds 5σ, and it can be immediately determined that a disconnection has occurred, and the apparatus can be stopped without damaging the grooved plug 24. .

  In the disconnection detection experiment 3-i, as shown in FIG. 17, the load of the intermediate drawing unit 51 and the change amount (differential value) of the load do not drop simultaneously with the occurrence of the disconnection. Since the disconnection occurs at the disconnection location i that is upstream of the diameter reducing portion 13, it does not affect the drawing load of the intermediate drawing portion 51 until the fracture portion passes the diameter reducing portion 13. Because.

  However, at the same time as the fractured portion passes through the reduced diameter processing portion 13, the amount of change (differential value) in the load of the intermediate drawing portion 51 changes in the same manner as in the disconnection detection experiment 3-h until the occurrence of disconnection. The determination can be made, and the apparatus can be stopped without damaging the grooved plug 24.

  As a result of the above-described disconnection detection experiment, the grooved plug 24 was directly pressed against the rolled ball 26 and was damaged in the manufacturing device of the comparative example depending on the location where the disconnection occurred.

  On the other hand, in each of the manufacturing apparatuses of the first to third embodiments, before the grooved plug 24 is damaged by the rolling ball 26, it is determined that a disconnection has occurred during the processing, and the processing is stopped. We were able to.

  Therefore, it has been proved that the grooved plug 24 can be prevented from being damaged by the manufacturing apparatus and the manufacturing method of the inner surface grooved pipe of the present invention.

In the correspondence between the embodiment described above and the configuration of the present invention,
The diameter reducing means corresponds to the diameter reducing processing portion 13,
The groove processing means corresponds to the groove processing portion 14,
The drawing means corresponds to the drawing unit 16,
The intermediate drawing means corresponds to the intermediate drawing unit 51,
The machining-related data corresponds to the measured load measured by the machining-related data detection units 17 and 45 or the measured ammeter 52,
The processing related data detection means corresponds to the processing related data detection unit 17, 45, 52,
The disconnection determination means corresponds to the control units 18, 46, 53 provided with a calculation unit and a storage unit,
The grooving load measuring means corresponds to the grooving load measuring load cell 41,
The reduced diameter processing load measuring means corresponds to the reduced diameter processing load measuring load cell 45,
The load related data corresponds to the differential value of the drawing load of the intermediate drawing unit 51,
The load-related data detecting means corresponds to the ammeter 52 and the calculation unit of the control unit 53, but the present invention is not limited to the configuration of the above-described embodiment, and many embodiments are obtained. be able to.

For example, the present invention is a manufacturing apparatus 10C of the third embodiment, provided with a load measuring instrument such as a load cell for measuring the load of the motor M ₂ of the intermediate drawing unit 51, a load measured by該荷heavy instrument, the load related It does not exclude the configuration used for determining the occurrence of disconnection as data.

  Further, the present invention may adopt the same configuration as the processing related data detection unit 45 provided in the diameter reduction processing unit 13 instead of the processing related data detection unit 17 as means for measuring the processing load in the groove processing unit 14. Alternatively, conversely, as means for measuring the machining load at the diameter reduction processing unit 13, a configuration similar to the processing related data detection unit 17 provided in the groove processing unit 14 may be employed instead of the processing related data detection unit 45. .

  Further, according to the present invention, the diameter-reduction processing unit 13 includes a processing-related data detection unit 45, the groove processing unit 14 includes a processing-related data detection unit 17, and both the processing-related data detection units 17 and 45 are used for disconnection. The structure which determines generation | occurrence | production may be sufficient.

  Furthermore, in the manufacturing apparatus 10 </ b> C of the third embodiment, the diameter reduction processing unit 13 includes the processing related data detection unit 45 and / or the groove processing unit 14 includes the processing related data detection unit 17, and the intermediate drawing unit 51. In addition to the differential value of the drawing load, it may be configured to determine the occurrence of disconnection using the processing related data detected at least one of the processing related data detection units 17 and 45.

  In addition, the pressing jig 27 is not limited to using the rolling ball 26, and other tools such as a roller may be used as long as the raw tube 11a can be pressed.

DESCRIPTION OF SYMBOLS 10A, 10B, 10C ... Manufacturing apparatus of inner surface grooved pipe 11 ... Inner surface grooved pipe 11a ... Elementary pipe 13 ... Diameter reduction processing part 14 ... Groove processing part 16 ... Drawing part 17, 45, 52 ... Processing related data detection part 18 , 46, 53, 59... Control unit 24... Slotted plug 41... Load cell for measuring groove processing load 51.

Claims (5)

A diameter reducing means for drawing and reducing the diameter of the tube;
Groove processing means for forming a plurality of grooves on the inner surface of the raw tube after passing through the diameter reducing means;
An apparatus for producing an internally grooved pipe comprising drawing means for drawing an internally grooved pipe that has been processed on the downstream side in the tube axis direction of the groove machining means,
An apparatus for manufacturing an internally grooved pipe, comprising processing-related data detection means for detecting processing-related data relating to a processing load generated in the pipe axis direction accompanying drawing of a raw pipe, upstream of the drawing means in the pipe axis direction. At least one of the machining-related data detection means is a grooving load measuring means for measuring the machining load in the grooving means and a reduced diameter machining load measuring means for measuring the machining load in the reduced diameter means. The manufacturing apparatus of the inner surface grooved pipe according to claim 1 constituted. An intermediate drawing means for drawing a raw pipe between the diameter reducing means and the groove processing means;
3. The manufacturing of an internally grooved tube according to claim 1 or 2, wherein the processing related data detecting means comprises load related data detecting means for detecting load related data related to a drawing load of a motor of the intermediate drawing means. apparatus. The apparatus for manufacturing an internally grooved tube according to any one of claims 1 to 3, further comprising a disconnection determining unit that determines that a disconnection has occurred based on the processing related data detected by the processing related data detecting unit. Using the apparatus for producing an internally grooved tube according to claim 4,
A method for manufacturing an internally grooved tube, wherein the disconnection determination means determines that a disconnection has occurred based on the processing related data detected by the processing related data detection means, and stops processing.

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