WO2010067576A1 - Tuyau comportant une surface intérieure rainurée, appareil de fabrication et procédé de fabrication de celui-ci - Google Patents

Tuyau comportant une surface intérieure rainurée, appareil de fabrication et procédé de fabrication de celui-ci Download PDF

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Publication number
WO2010067576A1
WO2010067576A1 PCT/JP2009/006674 JP2009006674W WO2010067576A1 WO 2010067576 A1 WO2010067576 A1 WO 2010067576A1 JP 2009006674 W JP2009006674 W JP 2009006674W WO 2010067576 A1 WO2010067576 A1 WO 2010067576A1
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WO
WIPO (PCT)
Prior art keywords
tube
diameter
load
processing
grooved
Prior art date
Application number
PCT/JP2009/006674
Other languages
English (en)
Japanese (ja)
Inventor
尹栄徳
釣弘太郎
橋爪利明
正武家和昭
Original Assignee
古河電気工業株式会社
田口忠
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2008312016A external-priority patent/JP5227771B2/ja
Priority claimed from JP2009032645A external-priority patent/JP5128515B2/ja
Priority claimed from JP2009125936A external-priority patent/JP5275904B2/ja
Priority claimed from JP2009273044A external-priority patent/JP5356195B2/ja
Application filed by 古河電気工業株式会社, 田口忠 filed Critical 古河電気工業株式会社
Priority to CN200980150021.9A priority Critical patent/CN102245323B/zh
Priority to KR1020117014300A priority patent/KR101278827B1/ko
Publication of WO2010067576A1 publication Critical patent/WO2010067576A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/20—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes from stock of essentially unlimited length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
    • B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles by means of mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/27—Carriages; Drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/27—Carriages; Drives
    • B21C1/30—Drives, e.g. carriage-traversing mechanisms; Driving elements, e.g. drawing chains; Controlling the drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
    • B21C3/02—Dies; Selection of material therefor; Cleaning thereof
    • B21C3/08—Dies; Selection of material therefor; Cleaning thereof with section defined by rollers, balls, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
    • B21C3/16—Mandrels; Mounting or adjusting same
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
    • B21C37/207—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with helical guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element

Definitions

  • the present invention relates to an internally grooved tube used as a heat transfer tube for a heat exchanger such as a refrigerator or an air conditioner, and a manufacturing method thereof.
  • Heat transfer tubes used in heat exchangers of heat pump equipment such as air conditioners and water heaters often use, for example, copper inner grooved tubes with inner surfaces grooved in order to improve heat exchange performance.
  • the groove formed on the inner surface is deepened, the torsion angle (lead angle) of the groove is increased, the fins are sharpened, and the tube
  • the performance of the heat exchanger is improved by manufacturing an internally grooved tube with a reduced wall thickness.
  • Patent Document 1 proposes a small-diameter heat transfer tube having an outer diameter of 3 to 6 mm, which is effective for downsizing heat exchange equipment.
  • the workability of the groove is assumed to be performed by a conventional processing method. Therefore, the twist angle was small and the degree of performance improvement was small.
  • the weight must be reduced (reducing the weight of the material used per unit length) to cope with the recent resource saving of metal materials. It was difficult.
  • Patent Document 2 an example of a high performance heat transfer tube having a deep inner groove depth is proposed, but it is intended for an outer diameter of 6 mm or more.
  • Patent Document 3 proposes an example of a high performance tube having a deep inner groove depth and a large twist angle.
  • a heat transfer tube having an outer diameter of about 7 mm which has been generally used as a heat transfer tube for air conditioning. Is targeted.
  • the diameter reducing means for reducing the diameter of the raw tube on the base movable in the drawing direction with respect to the drawing means for pulling out the grooved inner surface grooved tube Auxiliary drawing device, grooving means composed of drawing dies and floating plugs, and finishing processing device that finishes the outer surface of grooved reduced diameter pipe are fixed, and the drawing means pulls the grooved inner grooved tube
  • An apparatus for manufacturing an internally grooved tube having a base load detection device that detects a load applied to a base that moves relative to the drawing means has been proposed (see Patent Document 5).
  • an auxiliary pulling device for assisting pulling of a pipe by a pulling means, a pulling force detecting means for detecting a pulling force, and a pulling force for the raw pipe based on a detection value of the pulling force detecting means are set as targets.
  • An apparatus for manufacturing an internally grooved pipe provided with a control means for controlling the apparatus so as to be within a range and a manufacturing method using the manufacturing apparatus have been proposed.
  • Patent Document 5 the target load value at which the processing load detected by the pulling force detection means is optimal in operating the manufacturing apparatus for the internally grooved pipe is clearly in relation to the cross-sectional area in the pipe axis direction. It has not been. For this reason, the auxiliary drawing device cannot be appropriately controlled, and a high-performance heat transfer tube cannot be manufactured efficiently and stably.
  • the apparatus for manufacturing an internally grooved tube of Patent Document 6 includes a diameter reducing die and a floating plug for reducing the diameter of the element tube, and forms a large number of grooves on the inner surface of the element tube on the downstream side in the drawing direction of the element tube.
  • a grooved plug and a pressing tool are provided.
  • a wiper, a drawing device (intermediate drawing device), and an intermediate shaping die are provided between the reduced diameter die and the processing head along the drawing direction of the raw tube in order to prevent breakage of the raw tube during processing. This is a configuration provided.
  • the manufacturing apparatus of the inner surface grooved pipe of Patent Document 5 also includes a diameter reducing means for reducing the diameter of the raw pipe, and a groove processing means for forming a plurality of grooves on the inner face of the raw pipe on the downstream side in the drawing direction of the raw pipe.
  • a drawing means is also provided which also serves as a take-up drum for winding the processed inner grooved tube.
  • assistant extraction apparatus intermediate extraction apparatus
  • the control means which controls the extraction force of the said extraction means and an auxiliary extraction apparatus so that it may be settled in a target range.
  • a wiper is provided in order to prevent a pad that is in contact with the element pipe from sliding relative to the element pipe, or a groove shape of the pad is defined in the intermediate drawing apparatus. Although measures have been taken, load fluctuations can still occur.
  • the present invention is excellent in heat conduction performance, can be reduced in size and weight, and can achieve resource saving, and an inner grooved tube and such an inner grooved tube can be efficiently and stably provided.
  • An object is to provide a manufacturing method and a manufacturing apparatus that can be manufactured.
  • the twist angle of the groove with respect to the central axis of the tube is ⁇ (degrees) and the apex angle of the fin formed between adjacent grooves is ⁇ (degrees)
  • ⁇ is 30 to 60
  • ⁇ is 5 to 20
  • the outer diameter is D (mm)
  • the groove depth is H (mm)
  • the cross-sectional area in the axial direction of the tube is A C (mm 2 ). 6 or less
  • H is 0.07 or more
  • the groove depth can be increased, the twist angle can be increased, the apex angle can be decreased, and the heat transfer performance can be increased as compared with the conventional internally grooved tube. Furthermore, weight reduction and resource saving can be achieved by reducing the cross-sectional area.
  • the inner grooved tube can be used as a high-performance and lightweight heat transfer tube to reduce the size and weight of the heat exchanger.
  • the inner grooved tube can have an outer diameter D (mm) of 3 or more.
  • the inner grooved tube can be used as a more preferable heat transfer tube for a heat pump device such as an air conditioner or a water heater.
  • the inner grooved tube may have a groove depth H (mm) of 0.10 to 0.30.
  • the inner grooved tube can be used as a more preferable heat transfer tube for a heat pump device such as an air conditioner or a water heater.
  • the manufacturing method of the inner surface grooved pipe of the present invention is the manufacture of the inner surface grooved pipe provided with a diameter reducing means for drawing out and reducing the diameter of the raw pipe and a groove processing means for forming a large number of grooves on the inner surface of the raw pipe. An apparatus is used.
  • the diameter-reducing means can be constituted by a diameter-reducing die having a die hole in which a mortar-like slope that is widened toward the upstream side, for example.
  • a floating plug inserted into the raw tube can be disposed at a position corresponding to the die hole of the reduced diameter die.
  • the groove processing means is constituted by, for example, a grooved plug connected to the floating plug, and a rolling tool composed of a roller or a ball that presses the reduced diameter tube while planetarily rotating toward the grooved plug. be able to.
  • an inner surface grooved tube manufacturing method includes a drawing device in which the inner surface grooved tube manufacturing apparatus also serves as a take-up drum that winds an inner surface grooved tube downstream of the groove processing means.
  • the groove twisting angle with respect to the central axis of the pipe is ⁇ (degrees) using a manufacturing apparatus for an internally grooved pipe provided with a control means for controlling the means, and the top of the fin formed between adjacent grooves.
  • the drawing means can be constituted by a winding device such as a winding drum, for example, by drawing and winding the internally grooved tube obtained by processing the raw tube on the downstream side.
  • the auxiliary drawing means can be constituted by, for example, a device for assisting feeding by feeding the reduced diameter tube to the groove processing means by sandwiching the reduced diameter pipe with a belt or a pad.
  • the above manufacturing method makes it possible to obtain an internally grooved tube having a larger groove depth, a larger torsion angle, a smaller apex angle and a higher heat transfer performance than the conventional internally grooved tube. Furthermore, by reducing the cross-sectional area, it is possible to obtain a light-weight and resource-saving inner grooved tube.
  • a high-performance and lightweight heat transfer tube can be obtained efficiently and stably, and the heat exchanger can be reduced in size and weight.
  • P ⁇ 0.5 ⁇ (A C1 ⁇ ⁇ M ) is a slight variation in the driving force of the auxiliary pulling means when P ⁇ 0.5 ⁇ (A C1 ⁇ ⁇ M ). This is because the shape of the inner surface of the tube is easily changed, and the groove depth and the like are not constant.
  • P ⁇ 0.9 ⁇ (A C1 ⁇ ⁇ M ) means that when P> 0.9 ⁇ (A C1 ⁇ ⁇ M ), the pulling force is reduced due to slight wall thickness fluctuation or pulling force fluctuation. It is because the case where the breaking load of the tube is exceeded occurs and the tube breaks.
  • the cross-sectional area A C (mm 2 ) of A C ⁇ 0.8 ⁇ D indicates that the tube is thinner than the conventional one, but if the tube is thin, the tube will buckle. It becomes easy and the grooving by the grooving means becomes difficult. And the larger the tensile force in the axial direction, the more difficult it is to deform in the circumferential direction, and thus the grooving process becomes more difficult.
  • the auxiliary pulling means is controlled so that P is between 0.5 and 0.9 times (A C1 ⁇ ⁇ M ).
  • P is between 0.5 and 0.9 times (A C1 ⁇ ⁇ M ).
  • 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 AC1 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 finishing tube subjected to additional machining of the pull or the like.
  • empty drawing is a process which mainly reduces the outer diameter without directly processing the inner surface of the pipe, and indicates, for example, a process of drawing through an empty drawing die.
  • the outer diameter D (mm) is preferably 3 or more.
  • pressure loss is important in addition to heat transfer performance.
  • the outer diameter D (mm) is preferably 3 or more for practical reasons.
  • the depth H (mm) of the groove can be 0.10 to 0.30.
  • Heat transfer tubes used for heat pumps such as air conditioners are pushed from the inside of the tube with a tool such as a mandrel in order to press the aluminum fins. At that time, the fins on the inner surface are crushed and about 0.01 to 0.02 mm. Lower.
  • the groove depth is desirably 0.1 mm or more. Further, if the inner fin is too high, pressure loss increases and the material weight increases. Therefore, the groove depth H (mm) is preferably 0.3 or less.
  • the auxiliary pulling means can be configured to include, for example, a pair of endless members (loop-shaped members) that sandwich the raw tube from both sides with respect to the axial direction. By rotating the endless member such as the tube, it is possible to assist the drawing by the drawing means of the tube.
  • the load detecting means can be constituted by means capable of detecting a load such as a load cell.
  • Examples of the load detected by the load detection means include a compression load, a tensile load, and a moment load.
  • the inner grooved tube can be formed of a material having excellent thermal conductivity such as copper, aluminum, or an alloy thereof.
  • the inner surface grooved pipe manufacturing apparatus includes the diameter reducing means, the groove processing means, and a drawing means for pulling out the grooved inner surface grooved pipe in this order from the upstream side.
  • a feed assisting means (the auxiliary pulling means) provided between the diameter reducing means and the groove processing means for assisting the feeding of the reduced diameter tube in the feed direction toward the groove processing means, the diameter reducing means and the feed
  • An auxiliary means is fixed and a movable table is movable relative to the grooving means in parallel with the drawing direction of the drawing means, and the grooving means is fixed and parallel to the drawing direction with respect to the drawing means.
  • a base that is relatively movable a moving base load detection device that detects a load in the relative movement direction applied to the mobile base when the mobile base moves relative to the groove processing means, and the base against the pulling means
  • a base load detection device that detects a load in the relative movement direction applied to the base when the relative movement is performed, and a control unit that controls the operation of the feed assisting unit.
  • An inner grooved pipe manufacturing apparatus configured to be movable relative to the base in the drawing direction is used, and the control means includes at least a feed assist speed of the feed assist means and a feed assist torque of the feed assist means. It is preferable that either one is a manufacturing method of an internally grooved tube in which one of them is adjusted based on the difference between the loads detected by the moving table load detecting device and the base load detecting device.
  • the feed assist speed adjusted by the control means is set to 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. Control can be performed with the second feed assist speed.
  • the movable table and the base can be configured by a table having wheels on the bottom surface and capable of sliding freely.
  • the moving table load detection device and the base load detection device can be configured by an appropriate detector capable of detecting a load, such as a load cell.
  • a diameter reducing process for reducing the diameter of the raw pipe in the process of moving the raw pipe in the drawing direction, and forming a plurality of grooves on the inner face of the raw pipe
  • an intermediate drawing step is performed to pull out the element pipe reduced in the squeezing step, and the squeezing step is reduced to the sizing step.
  • the outer diameter D o of the blank tube mm), the diameter D 2 of the diameter die (mm), R D ⁇ (D o -D 2) / D o ⁇ radial contraction rate of mother tube represented by ⁇ 100 (%) R D ( %) Is set to R D ⁇ 30, and the outer diameter D 1 (mm) of the floating plug and the diameter D 2 (mm) of the reduced diameter die are set to satisfy D 1 ⁇ D 2 ⁇ 0.1. Is preferred.
  • the load assistance for assisting the extraction load by the intermediate extraction means can be stabilized.
  • the diameter reduction ratio of the blank pipe is greater than 30%, the contact area between the blank pipe and the diameter reduction die increases, and the frictional resistance increases, so the processing load on the diameter reduction die increases, The thinning of the outer diameter of the tube is smaller than the diameter of the outlet of the reduced diameter die.
  • the contact between the raw tube and the diameter-reducing die is not stable, and chattering is likely to occur, and the thickness is reduced. Vibration due to chattering is transmitted to the intermediate drawing means, and the outer diameter of the raw pipe is reduced by thinning. Therefore, the pressing force of the pad provided for holding the raw pipe in the intermediate drawing means becomes unstable. As a result, the load assistance in the intermediate drawing means becomes unstable.
  • the diameter reduction rate of the raw tube is set to 30% or less in the diameter reducing means so that such a problem does not occur during processing.
  • the chatter phenomenon is more effectively achieved by setting the outer diameter D 1 (mm) of the floating plug and the diameter D 2 (mm) of the reduced diameter die so that D 1 ⁇ D 2 ⁇ 0.1. Can be suppressed. More specifically, when the difference in diameter (D 1 -D 2 ) between the floating plug and the reduced diameter die is 0.1 mm or less, the area where the floating plug and the reduced diameter die overlap is reduced.
  • D 1 ⁇ D 2 ⁇ 0.1 is set so that such a problem does not occur during processing.
  • the revolution direction of the pressing tool is set to be opposite to the rotation direction of the grooved plug (hereinafter referred to as “reverse direction”), and the processing pitch P of the pressing tool ( mm) can be set in a range of 0.2 ⁇ P ⁇ 0.7.
  • the revolution direction of the pressing tool is set in the reverse direction, and the machining pitch P is set to P ⁇ 0.2. It is better to set it as small as possible.
  • the processing pitch P is within the range of 0.2 ⁇ P ⁇ 0.7, for example, 0 .2 ⁇ P ⁇ 0.4 is preferable.
  • the processing pitch P is set within the range of 0.2 ⁇ P ⁇ 0.7, for example, 0 It is better to set 4 ⁇ P ⁇ 0.7.
  • the revolution direction of the pressing tool is set to the same direction as the rotation direction of the grooved plug (hereinafter referred to as “positive direction”), and the processing pitch P of the pressing tool ( mm) can be set in a range of 0.2 ⁇ P ⁇ 0.4.
  • the inner surface fin is set by setting the machining pitch P (mm) to be in the range of 0.2 ⁇ P ⁇ 0.4.
  • the hems of the slabs do not have any glazing, and the groove depth is deep and the machining accuracy is high.
  • the revolving direction of the pressing tool is a positive direction.
  • An unfilled portion of a material called “egre” is likely to occur at the bottom of the fin formed between the two. Further, the greater the processing pitch P is, the easier it is to generate the egress.
  • the revolution direction of the pressing tool is a positive direction and 0.2 ⁇ P ⁇ 0.4.
  • the thinner the pipe the harder it is to form the fins, and the easier it is to break.
  • the present invention can be applied regardless of the thickness of the pipe, including thin pipes. Therefore, the thinner the pipe is, the more effective the production conditions of the present invention.
  • the shape of the inner surface is stable over the entire length of the long tube and can be processed without breaking, so that it can be applied regardless of the length of the raw tube, and the yield and productivity can be improved. it can.
  • the manufacturing apparatus of the inner surface grooved pipe of the present invention is characterized by comprising a diameter reducing means for reducing the diameter of the raw pipe and a groove processing means for performing groove processing on the inner surface of the reduced diameter pipe. To do.
  • the diameter reducing means, the groove processing means, and a drawing means for pulling out the grooved inner grooved tube are provided in this order from the upstream side, and between the diameter reducing means and the groove processing means.
  • An apparatus for producing an internally grooved pipe provided with a feed assisting means for assisting feeding of the reduced diameter pipe in a feed direction toward the groove machining means, wherein the diameter reducing means and the feed assisting means are fixed.
  • a movable base that is movable relative to the groove processing means in parallel with the drawing direction of the pulling means, and the relative movement applied to the movable base when the movable base moves relative to the groove processing means.
  • the manufacturing apparatus of the internally grooved tube provided with a moving table load detecting device for detecting a load in the moving direction.
  • the groove processing means is fixed and is movable relative to the drawing means in parallel with the drawing direction, and the base is moved relative to the drawing means.
  • a base load detecting device for detecting the load in the relative movement direction applied to the base, and a control means for controlling the operation of the feed assisting means, wherein the moving base is withdrawn from the base.
  • the control means adjusts the feed assist speed of the feed assist means based on the load detected by at least one of the moving table load detecting device and the base load detecting device.
  • the feed assist speed in the assist speed adjustment process is set to a first feed assist speed, and the feed assist torque adjustment process is determined based on a correlation with the feed assist torque.
  • the adjustment processing can be performed with the two-feed auxiliary speed.
  • the diameter reducing means and the groove processing means are provided along the drawing direction of the raw tube, and the diameter is reduced by the diameter reducing means between the diameter reducing means and the groove processing means.
  • An intermediate drawing means for drawing out the raw pipe, and the diameter reducing means is constituted by a diameter reducing die and a floating plug disposed in the pipe and reducing the diameter of the raw pipe together with the diameter reducing die, and the groove processing
  • the diameter reduction rate of the element pipe is set to 30% or less in the diameter reducing means, the so-called chattering that the element pipe slightly vibrates after the diameter reduction by the diameter reducing means.
  • the phenomenon is suppressed, and the load assist that assists the extraction load by the intermediate extraction means can be stabilized.
  • the diameter reduction ratio of the blank pipe is greater than 30%, the contact area between the blank pipe and the diameter reduction die increases, and the frictional resistance increases, so the processing load on the diameter reduction die increases, The thinning of the outer diameter of the tube is smaller than the diameter of the outlet of the reduced diameter die.
  • the contact between the raw tube and the diameter-reducing die is not stable, and chattering is likely to occur, and the thickness is reduced. Vibration due to chattering is transmitted to the intermediate drawing means, and the outer diameter of the raw pipe is reduced by thinning. Therefore, the pressing force of the pad provided for holding the raw pipe in the intermediate drawing means becomes unstable. As a result, the load assistance in the intermediate drawing means becomes unstable.
  • the diameter reduction rate of the raw tube is set to 30% or less in the diameter reducing means so that such a problem does not occur during processing.
  • the chatter phenomenon is more effectively achieved by setting the outer diameter D 1 (mm) of the floating plug and the diameter D 2 (mm) of the reduced diameter die so that D 1 ⁇ D 2 ⁇ 0.1. Can be suppressed. More specifically, when the difference in diameter (D 1 -D 2 ) between the floating plug and the reduced diameter die is 0.1 mm or less, the area where the floating plug and the reduced diameter die overlap is reduced.
  • D 1 ⁇ D 2 ⁇ 0.1 is set so that such a problem does not occur during processing.
  • the revolution direction of the pressing tool is set to be opposite to the rotation direction of the grooved plug (hereinafter referred to as “reverse direction”), and the processing pitch P of the pressing tool ( mm) can be set in a range of 0.2 ⁇ P ⁇ 0.7.
  • the revolution direction of the pressing tool is set in the reverse direction, and the machining pitch P is set to P ⁇ 0.2. It is better to set it as small as possible.
  • the processing pitch P is within the range of 0.2 ⁇ P ⁇ 0.7, for example, 0 .2 ⁇ P ⁇ 0.4 is preferable.
  • the processing pitch P is set within the range of 0.2 ⁇ P ⁇ 0.7, for example, 0 It is better to set 4 ⁇ P ⁇ 0.7.
  • the revolution direction of the pressing tool is set to the same direction as the rotation direction of the grooved plug (hereinafter referred to as “positive direction”), and the processing pitch P of the pressing tool ( mm) can be set in a range of 0.2 ⁇ P ⁇ 0.4.
  • the inner surface fin is set by setting the machining pitch P (mm) to be in the range of 0.2 ⁇ P ⁇ 0.4.
  • the hems of the slabs do not have any glazing, and the groove depth is deep and the machining accuracy is high.
  • the revolving direction of the pressing tool is a positive direction.
  • An unfilled portion of a material called “egre” is likely to occur at the bottom of the fin formed between the two. Further, the greater the processing pitch P is, the easier it is to generate the egress.
  • the revolution direction of the pressing tool is a positive direction and 0.2 ⁇ P ⁇ 0.4.
  • the thinner the pipe the harder it is to form the fins, and the easier it is to break.
  • the present invention can be applied regardless of the thickness of the pipe, including thin pipes. Therefore, the thinner the pipe is, the more effective the production conditions of the present invention.
  • the shape of the inner surface is stable over the entire length of the long tube and can be processed without breaking, so that it can be applied regardless of the length of the raw tube, and the yield and productivity can be improved. it can.
  • a drawing means for drawing an internally grooved pipe which has been processed on the downstream side in the tube axis direction of the grooving means, and a drawing of the raw pipe on the upstream side in the pipe axis direction from the drawing means. It is preferable that the manufacturing apparatus of the internally grooved pipe provided with the processing related data detecting means for detecting the processing related data relating to the processing load generated in the pipe axis direction.
  • the processing related data is, for example, the processing load measured by the diameter reducing means or the groove processing means, or the drawing load of the intermediate drawing means (the auxiliary drawing means), in other words, the motor load (driving force). Relevant load related data can be listed. 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.
  • the machining-related data detection means includes a groove machining 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 diameter reducing means.
  • a groove machining load measuring means for measuring the machining load in the grooving means
  • a reduced diameter machining load measuring means for measuring the machining load in the diameter reducing means.
  • 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.
  • 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.
  • the grooved plug is not affected by being delayed in the determination of the occurrence of disconnection.
  • the occurrence of disconnection can be recognized before it breaks.
  • 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.
  • an intermediate drawing means for drawing an element pipe between the diameter reducing means and the groove processing means is provided, and the processing related data detection means is related to a drawing load of a motor of the intermediate drawing means.
  • the load-related data detecting means for detecting the load-related data can be configured.
  • the intermediate drawing means 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.
  • 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.
  • the disconnection determining means for example, the standard deviation ( ⁇ ) 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 (5 ⁇ ), it can be determined that the tube is broken.
  • the load-related data can include drawing load (motor load), data such as current value and voltage value (electric signal) corresponding to the load, differential values and difference values of these data, and the like.
  • the load-related data is not limited to the motor load, but may be a motor torque.
  • 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.
  • a transmission mechanism such as a pulley or a belt that is movable by the motor load of the intermediate drawing means.
  • 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 can be provided.
  • 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.
  • the disconnection determining means 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.
  • the grooved plug provided in the groove processing means is damaged. Since machining can be stopped before, the grooved plug can be reliably prevented from being damaged.
  • an internally grooved tube that has excellent heat conduction performance, can be reduced in size and weight, and can realize resource saving, and such an internally grooved tube can be manufactured efficiently and stably. It is possible to provide a manufacturing method and a manufacturing apparatus that can be used.
  • FIG. 9 is a flowchart showing the overall operation of the inner surface grooved pipe manufacturing apparatus of the second embodiment. Sectional drawing which shows the manufacturing apparatus of the inner surface grooved pipe of Embodiment 3.
  • FIG. FIG. 9 is a flowchart showing the overall operation of the inner surface grooved pipe manufacturing apparatus of the second embodiment. Sectional drawing which shows the manufacturing apparatus of the inner surface grooved pipe of Embodiment 3.
  • FIG. 6 is a configuration explanatory view of a diameter reducing means, in which the diameter reducing means of Embodiment 3 is partially shown in cross section.
  • FIG. 9 is an operation explanatory view showing a state in which the diameter of a raw pipe is reduced by the diameter reducing means of Embodiment 3. Explanatory drawing explaining the processing pitch of the processing ball
  • FIG. Sectional drawing which shows a part of pipe inner surface which has the fin which the egle has generate
  • Sectional drawing which shows the manufacturing apparatus of the inner surface grooved pipe of Embodiment 4B.
  • Sectional drawing which shows the manufacturing apparatus of the inner surface grooved pipe of Embodiment 4C.
  • Sectional drawing explaining the installation location of the processing load detection part installed in each manufacturing apparatus of Embodiment 4A, 4B and a prior art.
  • Sectional drawing explaining the installation location of the process load detection part installed in the manufacturing apparatus of Embodiment 4C.
  • FIG. 1 is explanatory drawing of the manufacturing apparatus 12 of an inner surface grooved pipe
  • the manufacturing apparatus 12 has a reduced diameter portion 13, an auxiliary drawing device 17, a groove processing portion 14, and a finishing processing portion 15 in order from the upstream side to the downstream side in the drawing direction (drawing direction) (X direction in FIG. 1).
  • the drawing device 16 is further provided on the downstream side, and the inner tube 11a is manufactured by continuously processing the raw tube 11a with these configurations.
  • the manufacturing apparatus 12 includes a diameter-reduced portion 13 that draws and reduces the diameter of the raw tube 11 a, a groove processed portion 14 that forms a large number of grooves on the inner surface of the raw tube 11 a, and a downstream side of the groove processed portion 14. It comprises a drawing device 16 that also serves as a winding drum 36 for winding the machined inner grooved tube 11, and an auxiliary drawing device 17 that draws the raw tube 11 a between the reduced diameter portion 13 and the groove processing portion 14. ing.
  • the manufacturing apparatus 12 is movable with respect to the fixed base 50 so as to be movable in the drawing direction, the movable base 33 supporting the reduced diameter portion 13, the auxiliary drawing device 17 and the groove processing portion 14, and the fixing of the movable base 33.
  • the load cell 35 detects a processing load P acting in accordance with the movement with respect to the table 50, and the control device 45 controls the auxiliary extraction device 17 based on the processing load P detected by the load cell 35.
  • the reduced diameter portion 13 constitutes a cylindrical die 22 for reducing the diameter of the passing raw tube 11a.
  • the die 22 has a die hole 22a that opens toward the upstream side.
  • the reduced diameter portion 13 is provided with a floating plug 23 inside the raw tube 11a.
  • the floating plug 23 is formed so that a part of the outer peripheral surface in the axial direction is conical so as to be engageable with the die 22 via the raw tube 11a. Thereby, the floating plug 23 is rotatably engaged in the die 22 portion.
  • the groove processing portion 14 includes a grooved plug 24 in which a plurality of spiral grooves are formed on the outer periphery inside the raw tube 11a.
  • the grooved plug 24 and the floating plug 23 are rotatably connected to each other via a connecting rod 25.
  • the groove processing portion 14 includes a plurality of balls 26, and the plurality of balls 26 are disposed around the tube axis while being pressed against the tube 11a outside the tube 11a. .
  • the grooved portion 14 is configured such that the grooved plug 24 abuts on the inner peripheral surface of the raw tube 11 a, the raw tube 11 a is pulled in the drawing direction while rotating around the axis, and pressed by a plurality of balls 26, thereby being pressed.
  • a large number of parallel spiral grooves can be formed on the inner peripheral surface of the substrate.
  • the inner grooved tube 11 can be obtained by passing through the grooved portion 14.
  • the finishing portion 15 is provided with a diameter adjusting die 27, and the inner grooved tube 11 passes through the die hole 27 a of the diameter adjusting die 27, for example, by pressing the ball 26 in the groove processing portion 14. Processing to smooth the diameter of the tube surface distortion is performed.
  • the drawing device 16 includes a winding drum 36 and a winding motor M1, and winds around the winding drum 36 while pulling the inner grooved tube 11 by rotational driving of the motor M1.
  • the auxiliary drawing device 17 assists the drawing by the drawing device 16 by drawing the raw tube 11a in the drawing direction 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 pulling out the raw tube 11a, and the pulling load during the grooving increases, but the pulling load applied to the raw tube 11a by the auxiliary drawing device 17 is increased. Can be dispersed.
  • the auxiliary drawing device 17 includes a pair of belts 42a and 42b arranged on the upper and lower sides or the left and right sides with respect to the raw tube 11a.
  • Each of the belts 42a and 42b is formed in a loop shape (endless shape), and is stretched around the pulley 43 so as to be rotatable by the rotational drive of the motor M2.
  • the belts 42a and 42b are configured in a caterpillar type in which a plurality of pads 44 are continuously provided along the length direction on the outer peripheral surface.
  • the pair of belts 42a and 42b in the auxiliary pulling device 17 is desired to have a pressing force of the raw tube 11a by the pad 44 of, for example, 0.3 MPa from the viewpoint of obtaining a sufficient pulling force and preventing deformation of the raw tube 11a. It is provided on each side with respect to the element tube 11a so as to be kept at the pressing force of.
  • the pad 44 has a pad groove 44a having a circular cut surface in the connecting direction of the plurality of pads 44 at the contact portion with the outer surface of the base tube 11a after being reduced in diameter by the reduced diameter portion 13. Forming.
  • the movable table 33 is installed on the fixed table 50 via a plurality of wheels 33a so as to be movable in the drawing direction or the opposite direction with respect to the fixed table 50.
  • the part 14, the finishing part 15, and the auxiliary drawing device 17 are installed in a state of being accommodated in the box 32.
  • the load cell 35 is provided on the fixed base 50 and at the downstream end portion of the movable base 33 in the drawing direction so as to detect the processing load P received from the movable base 33 according to the pulling force of the raw tube 11a.
  • the control device 45 receives a load detection signal S in obtained by converting the machining load P detected by the load cell 35 into an electrical signal, and outputs a control signal S out for controlling the driving of the motor M2 of the auxiliary drawing device 17 according to the control program. To do.
  • control device 45 temporarily stores an arithmetic unit (CPU) for executing signal analysis processing and arithmetic processing, a hard disk for storing necessary control programs, and the load detection signal S in.
  • an input unit such as a keyboard for inputting control parameters and a display unit such as a monitor can be appropriately provided.
  • the manufacturing method of the inner surface grooved tube 11 in the present embodiment is performed using the inner surface grooved tube manufacturing apparatus 12 described above.
  • the axial cross-sectional area of the primary finish tube is A C1 (mm 2 )
  • the breaking stress of the primary finish pipe is ⁇ M (N / mm 2 )
  • the auxiliary drawing is performed so that the processing load P is between 0.5 and 0.9 times (A C1 ⁇ ⁇ M ).
  • the control of the speed of the motor M2 of the auxiliary pulling device 17 so as to be between P ⁇ 0.5 ⁇ (A C1 ⁇ ⁇ M ) is P ⁇ 0.5 ⁇ (A C1 ⁇ ⁇ M )
  • the shape of the inner surface of the tube is likely to change due to slight fluctuations in the driving force of the auxiliary drawing device 17, and the groove depth and the like are not constant.
  • the outer diameter D is in the range of 3 mm to 6 mm, and the depth H of the groove 2 is 0.07 mm to 0.10 mm.
  • the twist angle ⁇ of the groove 2 with respect to the central axis of the tube is in the range of 30 to 60 degrees, and the apex angle ⁇ of the fin 1 formed between adjacent grooves 2 is from 5 degrees.
  • the cross-sectional area with respect to the axial direction of the pipe is A C1 (mm 2 ) in the range of 20 degrees
  • the internally grooved pipe 11 satisfying A C1 ⁇ 0.8 ⁇ D can be manufactured. Note that A C1 ⁇ 0.8 ⁇ D indicates that the tube is thinner than the conventional one.
  • the tube wall tends to buckle in the ball revolving direction, and the material constituting the tube escapes radially outward before a portion of the tube wall is filled in the plug groove. Because.
  • the load in the drawing direction applied to the tube is reduced by the control described above, and even when grooving a thin wall tube, It becomes possible to suppress circumferential buckling.
  • the inner grooved tube 11 can be a heat transfer tube having a larger groove depth, a larger torsion angle, a smaller apex angle, and a higher heat transfer performance than the conventional technology. Furthermore, by reducing the cross-sectional area, a heat transfer tube that is lightweight and resource-saving can be obtained. Further, by using such a high-performance and lightweight heat transfer tube, the heat exchanger can be made small and light.
  • the method for controlling the speed of the motor M2 of the auxiliary extraction device 17 by the control device has been described.
  • the speed is controlled as a control parameter, but also the acceleration, torque, rotation angle, Alternatively, a plurality of these may be controlled as control parameters.
  • FIG. 1 shows an example in which one motor M2 is attached to drive the auxiliary pulling device 17, but two motors may be attached to the left and right for operation.
  • a motor that can follow the target operation control value such as a servo mechanism, the machining load P at the time of machining the internally grooved tube having the difficult-to-break shape as in the present invention is generated. This makes it possible to control in more detail and is effective in stabilizing the operation of the equipment.
  • the manufacturing method of the present invention only needs to be a method for controlling at least the auxiliary drawing device 17.
  • P is between 0.5 and 0.9 times (A C1 ⁇ ⁇ M ).
  • both the auxiliary drawing device 17 and the drawing device 16 may be controlled.
  • each elementary tube 11a was subjected to an internal groove processing apparatus under the appropriate conditions shown below, and a processing experiment was performed to produce a primary finish tube as an internal grooved tube.
  • the outer diameter D the number of grooves, the bottom thickness t, the groove depth H, the torsion angle ⁇ , the apex angle ⁇ , the groove bottom width W 1 , the mountain bottom width W 2 , the groove bottom width W 1 and the groove depth.
  • the ratio of H and the cross-sectional area A C1 (refer to FIG. 2) with respect to the axial direction as parameters, the inner grooved tube 11 of Examples 1 and 2 as shown in Table 1 below and Comparative Example 1 as a comparison between them Attempts were made to manufacture the inner grooved tube of No.4.
  • a plurality of copper tubes (element tubes 11a) having an outer diameter of 8 mm and a smooth inner surface are prepared as processing raw materials, and processing is performed with a target of continuous 1000 m or more. Was performed five times, and a processing yield experiment was performed to compare the number of times 1000 mm or more could be processed without breaking.
  • the processing load P is 0.5 ⁇ (A C1 ⁇ ⁇ M ) ⁇ P ⁇ 0. It is manufactured by a processing method for controlling the speed of the motor M2 of the auxiliary drawing device 17 so as to be 9 ⁇ (A C1 ⁇ ⁇ M ).
  • Examples 1 and 2 experiments were performed with the target pull-out loads set to 1200 N and 700 N, respectively.
  • Comparative Examples 3 and 4 were performed by the method for manufacturing an internally grooved tube disclosed in Patent Document 3 (Japanese Patent Laid-Open No. 2001-241877). That is, in the comparative examples 3 and 4, the auxiliary drawing device 17 is not provided, and the manufacturing is performed using a manufacturing device that draws the raw tube 11a only with the drawing device.
  • Table 1 shows the results of the primary finishing tube processing experiment for each of Examples 1 and 2 and Comparative Examples 1 to 4. *
  • the manufacturing method of the present invention capable of processing the apex angle at 16 degrees as in Examples 1 and 2 is particularly effective.
  • Comparative Example 3 it was possible to process all five times without breaking.
  • the outer diameter D is 8 mm larger than 6 mm
  • the apex angle ⁇ is 23 degrees larger than 20 degrees
  • the cross-sectional area A C1 with respect to the axial direction is Was larger than 0.8D to 7.6 mm 2
  • the shape of the present invention as in Examples 1 and 2 was not obtained.
  • Comparative Example 4 the same manufacturing apparatus as in Comparative Example 3 was used, and in particular, an attempt was made to process the outer diameter D to 6 mm, which was the same as in Examples 1 and 2. It was 0 times, and all of them were broken immediately after starting the processing, and the processing could not be continued.
  • empty drawing is a method in which the primary finish pipe is pulled through a die without directly processing the inner surface of the primary finish pipe, and the outer diameter is reduced and the wall thickness is reduced by the empty drawing. Slightly decreases. Further, the torsion angle decreases as it extends in the longitudinal direction. In general, empty drawing is not performed if the primary finish pipe has a desired outer diameter, but is performed on the primary finish pipe when the primary finish pipe is larger than the desired outer diameter. In order to evaluate the later tube shape, a blanking experiment was performed on Example 1 or 2 and Comparative Example 3.
  • Example 3 the primary finish tube of Example 1 or 2 was evacuated to reduce the outer diameter to 5 mm.
  • Comparative Example 5 the primary finish tube of Comparative Example 3 was evacuated and reduced in diameter to 7 mm in outer diameter.
  • the ratio of the outer diameter and the cross-sectional area does not exactly match in the primary finishing pipe and the final finishing pipe that has undergone empty drawing, but in the scope of implementation, the diameter reduction rate of the empty drawing (the reduction rate of the outer diameter) is It is about 10 to 20%, and within this range, A C1 / D 1 ⁇ A C / D.
  • a C1 and D 1 indicate the cross-sectional area and outer diameter in the axial direction of the primary finish pipe, respectively, and
  • a C and D indicate the cross-sectional area and outer diameter in the axial direction of the final finish pipe, respectively.
  • the outer diameter D is 5 mm which is 3 mm or more and 6 mm or less
  • the depth H of the groove 2 is 0.07 mm or more and 0.15 mm which is 0.10 mm to 0.30 mm.
  • the twist angle ⁇ of the groove 2 with respect to the central axis of the tube is 40 degrees, which is 30 degrees to 60 degrees
  • the apex angle ⁇ of the fin 1 formed between the adjacent grooves 2 is 2 degrees to 20 degrees. is 10 degrees
  • the heat transfer tube is obtained for satisfying the desired shape of the cross-sectional area a C with respect to the axial direction is smaller 3.8 mm 2 next than 0.8 times the outer diameter D, sinking after the invention of the tube It was.
  • Comparative Example 5 is obtained by emptying Comparative Example 3 as a primary finish pipe as described above.
  • Comparative Example 5 deviates from a desired shape in that A C1 > 0.8D 1 or the like. Even when 3 was emptied, it could not be processed into the desired shape (A C > 0.8D).
  • Example 3 the heat transfer performance was also evaluated as shown in Table 2.
  • the heat transfer performance of Example 3 is shown as relative heat transfer performance when the value of the heat transfer coefficient in the condensing tube of Comparative Example 5 is 100.
  • the heat transfer coefficient in the condensation tube used for calculating the heat transfer performance is measured by the following measurement method.
  • Each of the sample tubes is inserted as an inner tube of a double-tube heat exchanger sample installed horizontally, and the refrigerant (R410a) flows into the samples, and the double tube between the outer tube and the inner tube is inserted. Cooling water was allowed to flow in the pipe portion so as to counteract the refrigerant, and the refrigerant was cooled by heat exchange between the cooling water and the refrigerant.
  • the heat transfer rate in the tube (condensation heat) at a refrigerant mass flow rate of 300 kg / m 2 sec was measured (measured based on the tube outer surface reference).
  • Example 3 of this invention As shown in Table 2, in Example 3 of this invention, it was set to 137 and the heat-transfer performance higher than the comparative example 5 was obtained.
  • Example 3 and Comparative Example 5 should compare and evaluate the heat transfer performance between those having the same diameter.
  • Table 2 compares pipes having different diameters. It shows heat transfer performance.
  • Examples 4 to 8 as shown in Table 3 are manufactured as final finished pipes by the manufacturing method of the present invention described above, and the inner grooved pipes of the present invention are manufactured based on these Examples 4 to 8. The effectiveness of the method was verified.
  • Example 6 the primary finish tube of Example 1 or 2 was used.
  • each of Examples 4 to 8 had a desired shape satisfying the above-described range of the internally grooved tube 11 of the present invention, and could be processed with a high yield.
  • the groove depth is larger than that of the prior art, the twist angle is larger, and the apex angle is smaller.
  • the inner grooved tube 11 can be manufactured, and it has been proved that a heat transfer tube having high heat transfer performance can be manufactured.
  • This is a high-performance heat transfer tube that is ideal for heat exchangers of heat pump equipment such as air conditioners and water heaters.
  • the blanking was performed after the primary finish tube was created.
  • the inner grooved tube of the present invention is not limited to the form in which the blanked tube is used as a product, but the primary finish tube.
  • the form made into a product with the shape of is also included.
  • the reduced diameter portion 13 of this embodiment corresponds to the reduced diameter means of the present invention.
  • the groove processing section 14 corresponds to the groove processing means
  • the drawing device 16 corresponds to the drawing means
  • the auxiliary extraction device 17 corresponds to auxiliary extraction means
  • the movable part 33 corresponds to the movable means
  • the load cell 35 corresponds to the load detection means
  • the control device 45 corresponds to the control means
  • the fixed base 50 corresponds to the installation part
  • the primary finishing pipe or the final finishing pipe corresponds to the pipe after passing the grooving means, but the present invention is not limited to the configuration of the first embodiment, and many embodiments can be obtained. .
  • the inner surface grooved pipe manufacturing apparatus 101 includes a diameter reducing device 120 that reduces the diameter of the raw pipe 201 that is the object to be processed 200, a groove processing apparatus 140 that performs groove processing on the inner surface of the reduced diameter reduced pipe 202, and a groove A winding drum 160 for pulling out the processed inner grooved tube 204 is provided in this order from the upstream side.
  • An auxiliary feeding device 130 is provided between the diameter reducing device 120 and the groove processing device 140 to assist the feeding of the reduced diameter tube 202 in the feeding direction toward the groove processing device 140.
  • an upstream movable base that is fixed to the diameter reducing apparatus 120 and the auxiliary feeding apparatus 130 and is relatively movable with respect to the groove processing apparatus 140 in parallel with the drawing direction of the winding drum 160. 182 is provided, and an upstream load detector 192 that detects a load in the relative movement direction applied to the upstream movable table 182 when the upstream movable table 182 moves relative to the groove processing device 140 is provided.
  • the inner surface grooved pipe manufacturing apparatus 101 is provided with an entire movable stand 184 to which the groove processing apparatus 140 is fixed and which can move relative to the winding drum 160 in parallel with the drawing direction.
  • the upstream movable table 182 is configured to be movable relative to the entire movable table 184 in the drawing direction.
  • an overall load detector 194 that detects a load in the relative movement direction applied to the entire movable table 184 when the entire movable table 184 moves relative to the winding drum 160 is provided.
  • the inner surface grooved pipe manufacturing apparatus 101 includes a controller 171 and a calculator 176 that control the operation of the auxiliary feeder 130. Then, the controller 171 and the calculator 176 adjust the feed assist speed adjustment process for adjusting the feed assist speed of the auxiliary feed device 130 based on the load detected by at least one of the upstream load detector 192 and the overall load detector 194. And at least one of the feed assist torque adjustment processing for adjusting the feed assist torque of the auxiliary feed device 130.
  • 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.
  • the feed assist torque and It adjusts with the 2nd feed auxiliary speed defined based on the correlation.
  • the controller 171 and the calculator 176 include at least a feed assist speed adjustment process for adjusting the feed assist speed of the auxiliary feed device 130 and a feed assist torque adjustment process for adjusting the feed assist torque of the auxiliary feed device 130. Either one is adjusted based on the difference between the loads detected by the upstream load detector 192 and the overall load detector 194.
  • FIG. 4 is a configuration diagram illustrating a configuration of the inner surface grooved pipe manufacturing apparatus 101 according to the second embodiment.
  • FIG. 4 shows a device used for processing, a device used for sensing, and a device used for control.
  • FIG. 5 is an explanatory diagram for explaining the load applied to the material, the pulling force and auxiliary feed force used for processing, and the load to be detected in the inner surface grooved pipe manufacturing apparatus 101.
  • the apparatus used for processing will be described. From the upstream side to the downstream side, the diameter reducing device 120, the auxiliary feeding device 130, the groove processing device 140, and the finishing device 150 are arranged so that their processing parts are horizontal and straight.
  • a take-up drum 160 that is arranged in order and that further draws and unwinds the tube 201 in a straight line is provided downstream thereof.
  • the material of the raw tube 201 to be processed can be a metal having excellent thermal conductivity, such as copper, aluminum, or an alloy thereof.
  • the diameter reducing device 120 includes a gap between a diameter reducing die 121 that presses the periphery of the cylindrical pipe 201 inwardly and a floating plug 111 disposed inside the raw pipe 201. It is a device that reduces the diameter through.
  • the diameter-reducing die 121 is provided with a die hole 122 in which a mortar-shaped slope that is widened toward the upstream side is formed.
  • the floating plug 111 is formed in a size larger than the minimum radius portion of the die hole 122 and slightly smaller than the inner peripheral size of the element tube 201, and is inserted into the element tube 201 in a free state. For this reason, when the base tube 201 is pulled out while being reduced in diameter by the die hole 122 of the reduced diameter die 121, the floating plug 111 is not pulled out together.
  • the surface of the floating plug 111 facing the die hole 122 is formed as a truncated cone-shaped inclined surface.
  • the raw tube 201 supplied from the upstream side is reduced in diameter by the diameter reducing device 120 to become a reduced diameter tube 202.
  • the diameter reduction drawing load R3 is applied to the raw tube 201 as shown in FIG.
  • the auxiliary feeding device 130 includes a pressing device 131, a mounting plate 132, a pulley 133, and a belt 134.
  • the pressing device 131 presses the belt 134 together with the mounting plate 132 toward the reduced diameter tube 202 (see FIG. 4).
  • the attachment plate 132 is attached to the upstream machine casing 102 so as to be movable up and down (movable in a direction perpendicular to the drawing direction), and rotatably supports a pair of pulleys 133 arranged in the drawing direction.
  • a pair of pulleys 133 an endless belt 134 is stretched without slack, and the belt 134 is rotated by the driving force of the motor M2 that 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 periphery.
  • the pad 135 is preferably made of a material harder than the base tube 201, and is made of, for example, tool steel.
  • the mounting plate 132 provided with the pulley 133 and the belt 134 is provided symmetrically in the vertical direction (symmetrical in the direction perpendicular to the drawing direction) with the reduced diameter tube 202 interposed therebetween. Furthermore, the pressing device 131 is also provided vertically symmetrically. As a result, the upper and lower pressing devices 131 press the upper and lower pressing devices 131 toward the reduced diameter tube 202, and the reduced diameter tube 202 is sandwiched between the pads 135.
  • the auxiliary feeding device 130 performs an auxiliary feeding operation under the control of the configuration and the controller 171.
  • the pressing device 131 holds the reduced diameter tube 202 from above and below with the pad 135 at a constant pressure at which the reduced diameter tube 202 is not excessively deformed.
  • the pulley 133 is rotated at a constant ratio by the rotational drive of the motor M2 according to the control of the controller 171, and the belt 134 is rotated along with this, and the material traveling direction (drawing) between the pad 135 and the reduced diameter tube 202 is rotated.
  • Direction feed friction force.
  • the auxiliary feed device 130 can apply the auxiliary feed force F2, that is, the auxiliary feed torque to the reduced diameter tube 202 as shown in FIG. For this reason, the speed of the pad 135 in the feeding direction is higher than or equal to the winding speed of the winding drum 160.
  • the groove processing device 140 includes a grooved plug 113, a processing head 141, a rolling tool 142, a pressing member 143, and a bearing 144.
  • the grooved plug 113 is inserted into the reduced diameter tube 202 in a free state, and is rotatably connected to the above-described floating plug 111 by a connecting rod 112. Thereby, it is comprised so that the position in the extraction direction of the grooved plug 113 may not move back and forth.
  • the processing head 141 is formed with a conical surface that expands toward the downstream.
  • the inner diameter of the through hole including this conical surface is formed to be slightly larger than the outer diameter of the reduced diameter tube 202.
  • the pressing member 143 is formed in a ring shape and is rotatably attached by a bearing 144.
  • the rolling tool 142 is composed of a plurality of balls.
  • the rolling tool 142 is sandwiched between the conical surface of the machining head 141 and the pressing surface (upstream side surface) of the pressing member 143 so as to be planetary rotatable, and the reduced diameter tube 202 faces the inner side of the tube. And press.
  • the rolling tool 142 rotates in a planetary manner and presses the reduced diameter tube 202 against the grooved plug 113, thereby reducing the number of fins 205 (spiral grooves) along the spiral groove of the grooved plug 113. It can be formed on the inner surface of the tube 202.
  • the fins 205 can be formed with a predetermined twist angle (lead angle), a predetermined fin height, and a predetermined fin interval with respect to the tube axis.
  • the rolling tool 142 can be composed of a plurality of rollers, or can be composed of rollers and balls.
  • the reduced diameter tube 202 supplied from the upstream side becomes a groove applying tube 203 having grooves (fins 205) formed on the inner surface.
  • a grooving load R2 is applied to the reduced diameter tube 202 as shown in FIG.
  • the finishing device 150 includes a shaping die 151.
  • the shaping die 151 is provided with a die hole 152 having a conical surface that widens toward the upstream side.
  • the radius of the minimum radius portion of the die hole 152 is formed slightly smaller than the outer peripheral radius of the groove providing tube 203.
  • the winding drum 160 is a drum that winds the inner grooved tube 204. This winding is executed by the rotational force of the motor M1 according to the speed instruction signal of the controller 173. Further, the winding force becomes a straight drawing force F1 in a certain direction with respect to the raw tube 201, and a drawing torque can be generated to perform diameter reduction processing or inner surface groove processing.
  • the diameter reducing device 120 and the auxiliary feeding device 130 are fixed to the upstream machine casing 102.
  • the upstream machine casing 102 configured as described above is fixed to the upstream movable table 182 and can be reciprocally slid along the upstream movable table 182 in parallel with the drawing direction (horizontal in this embodiment). . That is, the upstream movable table 182 is provided with wheels 182a, and the wheels 182a are engaged with the rails 184b of the entire movable table 184, and can thereby move smoothly along the rails 184b. Accordingly, the diameter reducing device 120 and the auxiliary feeding device 130 move integrally with the upstream movable table 182.
  • an upstream load detector 192 is provided at the end of the upstream movable table 182 in the drawing direction.
  • the upstream load detector 192 is constituted by an appropriate detector capable of detecting a load such as a load cell.
  • the upstream load detector 192 can detect the load of the upstream movable table 182 applied in the drawing direction during drawing as an upstream load detection value V (T1) (see FIG. 5).
  • the groove processing device 140 and the finishing device 150 are fixed to the entire machine casing 104. Further, the entire machine casing 104 configured as described above is fixed to the entire movable base 184, and reciprocally slides on the fixed base 186 along with the whole movable base 184 in parallel with the drawing direction (horizontal in this embodiment). it can. That is, the entire movable base 184 is provided with a wheel 184a, and the wheel 184a is engaged with the rail 186b of the fixed base 186, thereby being able to move smoothly along the rail 186b. Accordingly, the groove processing device 140 and the finishing device 150 are moved integrally with the entire movable table 184.
  • an overall load detector 194 is provided at the end of the overall movable stand 184 in the drawing direction.
  • the total load detector 194 is formed of an appropriate detector that can detect a load such as a load cell. With this total load detector 194, the load on the entire movable base 184 applied in the drawing direction during the drawing process can be detected as the downstream load detection value V (T2) (see FIG. 5).
  • a controller 171 a speed setter 172, a controller 173, an upstream signal converter 174, an overall signal converter 175, and a 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. Further, the actual rotational speed and torque of the motor M2 are fed back to the calculator 176.
  • the speed setting unit 172 is a device that sets the drawing speed by the winding drum 160, and transmits a set value to the controller 173 and the calculator 176.
  • Controller 173 sets and instructs the rotational speed of motor M1 based on the drawing speed received from speed setter 172.
  • the upstream signal converter 174 converts a signal of a pressing force (detected by the upstream load detector 192) caused by the upstream movable base 182 carrying the upstream machine casing 102 in the drawing direction (material traveling direction) into an electrical signal, This signal is transmitted to the computing unit 176 as the upstream load detection value V (T1).
  • the overall signal converter 175 converts a signal of pressing force (detected by the overall load detector 194) caused by the overall movable base 184 carrying the overall machine casing 104 in the drawing direction (material traveling direction) into an electrical signal, This signal is transmitted to the computing unit 176 as the downstream load detection value V (T2).
  • the computing unit 176 performs computation based on the upstream load detection value V (T1) received from the upstream signal converter 174, the downstream load detection value V (T2) received from the overall signal converter 175, and various setting information.
  • the rotation instruction speed S (H) of the motor M2 is adjusted as needed and transmitted to the controller 171.
  • FIG. 6 is a flowchart showing the overall operation of the inner surface grooved pipe manufacturing apparatus 101.
  • the inner surface grooved pipe manufacturing apparatus 101 starts the winding drum 160 (step s1).
  • the controller 173 completes the manufacture of the internally grooved tube 204 based on the drawing speed received from the speed setting device 172 so as to be wound with a constant drawing force F1 according to the material and diameter of the raw tube 201.
  • the speed of the motor M1 of the winding drum 160 is controlled.
  • the inner surface grooved pipe manufacturing apparatus 101 starts the auxiliary feeding apparatus 130 (step s2).
  • the controller 171 performs the first auxiliary feed speed control on the motor M2 so that the initial auxiliary feed speed (first auxiliary feed speed) corresponding to the material and diameter of the raw tube 201 is obtained (step s3).
  • the initial auxiliary feed speed is a high speed in a range where the raw pipe 201 is not broken by the inner surface grooved pipe manufacturing apparatus 101 according to the material and diameter of the raw pipe 201 to be processed, and is set in advance. Is speed.
  • the raw pipe 201 is not broken, but the groove processing load R2 applied to the reduced diameter pipe 202 by the groove processing apparatus 140 is too large, and the fin 205 is not formed in the groove processing apparatus 140. Alternatively, the formed fin 205 cannot secure a predetermined accuracy.
  • the inner surface grooved pipe manufacturing apparatus 101 detects the upstream load detection value V (T1) with the upstream load detector 192 (step s4), and the downstream load detection value V (T2) with the overall load detector 194. ) Is detected (step s5) and transmitted to the computing unit 176.
  • the computing unit 176 calculates a load difference value (T3) that 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 overall load detector 194 ( Step s6).
  • This load difference value (T3) indicates the total load of the grooving load R2 applied to the grooving device 140 and the finish drawing load R1 applied to the finishing device 150. More specifically, as described above, the upstream load detection value V (T1) is determined by the load of the upstream movable table 182 in the drawing direction during the drawing process, that is, the reduced diameter drawing load R3 in the diameter reducing device 120 and the auxiliary feed device 130. The total load of the auxiliary feed force F2 is shown.
  • the downstream load detection value V (T2) is the load of the entire movable base 184 in the drawing direction during the drawing process, that is, the reduced diameter drawing load R3 in the diameter reducing device 120, and the auxiliary feed force F2 by the diameter reducing device 120.
  • the total load of the grooving load R2 in the grooving device 140 and the finish drawing load R1 in the finishing device 150 is shown.
  • the load difference value (T3) which is the difference between the upstream load detection value V (T1) and the downstream load detection value V (T2), is the grooving load R2 applied to the grooving device 140 and the finish drawing applied to the finishing device 150.
  • the outer peripheral surface of the groove-applying tube 203 is slightly reduced in diameter in order to obtain the inner-surface grooved tube 20 as a finished product.
  • the finish drawing load R1 in the finishing device 150 is substantially constant and is negligibly small as compared with the reduced diameter drawing load R3 in the groove processing device 140. Therefore, the load difference value (T3) may be considered to be the reduced diameter drawing load R3 in the grooving apparatus 140 substantially.
  • the reduced diameter drawing load R3 in the groove processing device 140 has a great influence on the formation of the fin 205 when forming the groove imparting pipe 203 from the reduced diameter pipe 202 supplied from the upstream side. Specifically, when the reduced diameter drawing load R3 in the groove processing apparatus 140 is smaller than a predetermined range set in advance, that is, the load in forming the fin 205 in the groove processing apparatus 140 is small, sufficient fins 205 can be formed. It means not.
  • the reduced diameter drawing load R3 in the groove processing apparatus 140 is larger than a predetermined range, that is, when the load in forming the fin 205 in the groove processing apparatus 140 is too large, the desired fin 205 cannot be formed in the same manner. .
  • the arithmetic unit 176 causes the auxiliary feed device 130 to act on the reduced diameter pipe 202 so that the load difference value (T3) is within a predetermined range set in advance according to the material and diameter of the raw pipe 201. Torque is calculated (step s7).
  • the auxiliary feed torque is calculated based on the no-load torque and the rod friction torque, and becomes a torque for feeding the reduced diameter tube 202 toward the groove processing device 140 by the auxiliary feed device 130.
  • the motor M2 in the auxiliary feed device 130 is Torque control cannot be performed to match the auxiliary feed torque calculated in step s7.
  • the arithmetic unit 176 instructs the controller 171 to increase or decrease the speed so that the second auxiliary feed speed is determined based on the correlation with the auxiliary feed torque set in advance according to the material and diameter of the raw tube 201.
  • the controller 171 executes torque control based on the received acceleration / deceleration instruction to the motor M2 (step s8).
  • step s3 depending on the material and diameter of the raw pipe 201, the speed is increased to the initial auxiliary feed speed (first auxiliary feed speed), which is a high speed within a range in which the raw pipe 201 is not broken by the inner surface grooved pipe manufacturing apparatus 101.
  • the second auxiliary feed speed determined based on the auxiliary feed torque for controlling the torque to the auxiliary feed device 130 in step s8, that is, the correlation with the auxiliary feed torque is the initial auxiliary feed speed (first auxiliary feed speed).
  • the speed is lower, and the controller 171 controls the motor M2 to decelerate.
  • the inner surface grooved pipe manufacturing apparatus 101 that has executed the torque control for the auxiliary feeder 130 in step s8 uses the upstream load detector 192 and the overall load detector 194 to detect the upstream load detection value V (T1) as in steps s4 to s6. And the downstream load detection value V (T2), and the calculator 176 calculates the load difference value (T3) after torque control of the auxiliary feeder 130, and the calculated load difference value (T3) is calculated in advance. It is determined whether it is within the set predetermined range (step s9).
  • step s9 When the load difference value (T3) after torque control of the auxiliary feeder 130 is not within the predetermined range (step s9: No), the process returns to step s4, and the calculator 176 has the load difference value (T3) within the predetermined range.
  • the auxiliary feed torque is calculated so that
  • step s9: Yes when the load difference value (T3) after torque control of the auxiliary feeder 130 is within a predetermined range set in advance (step s9: Yes), the controller 171 has a predetermined amount of the internally grooved tube 204. Is manufactured (step s10). If a predetermined amount of the internally grooved tube 204 has already been manufactured, the manufacture of the internally grooved tube 204 by the internally grooved tube manufacturing apparatus 101 is stopped (step s10: Yes). On the other hand, when the predetermined amount of the internally grooved tube 204 has not been manufactured yet (step s10: No), the process returns to step s4 until the predetermined amount of the internally grooved tube 204 can be manufactured. Repeat until.
  • the inner surface grooved pipe manufacturing apparatus 101 uses the calculator 176 to detect the upstream load detection value V (T1) detected by the upstream load detector 192 and the downstream load detection value V (T2) detected by the overall load detector 194. So that the load difference value (T3) substantially indicating the reduced diameter drawing load R3 in the groove processing device 140 is within a predetermined range set in advance according to the material and diameter of the raw tube 201.
  • the auxiliary feed torque applied to the reduced diameter tube 202 is controlled by the feed device 130. For this reason, it is possible to stabilize the reduced diameter drawing load R3 that greatly affects the formation of the fins 205, and to form the fins 205 with desired accuracy even under the processing conditions close to the processing limit.
  • an internally grooved tube 204 with a precision that was impossible in the past for example, a fin having a high twist angle (lead angle) of 40 to 60 ° with respect to the tube axis and having a fin height of 0.2 mm or more
  • a plurality of pipes formed on the inner surface such that the ratio H / t between the height H and the groove bottom wall thickness t between adjacent fins is 1.2 or less can be manufactured with high productivity.
  • the auxiliary feed torque for controlling the torque of the auxiliary feed device 130 is determined by using the second auxiliary feed speed determined based on the correlation with the auxiliary feed torque set in advance according to the material and diameter of the raw tube 201. Therefore, it is possible to surely control the torque of the motor M2, which cannot be torque controlled, and to form the fins 205 with desired accuracy.
  • the inner grooved pipe manufacturing apparatus 101 has a high speed in a range in which the inner pipe 201 is not broken in the inner grooved pipe manufacturing apparatus 101 according to the material and diameter of the raw pipe 201 to be processed. Control is performed at the set first auxiliary feed speed. Thereafter, the auxiliary feed device 130 is torque-controlled at a second auxiliary feed speed that is lower than the initial auxiliary feed speed (first auxiliary feed speed) and determined based on the correlation with the auxiliary feed torque. For this reason, the productivity of the internally grooved tube 204 having the fins 205 formed with a desired accuracy can be improved.
  • the inner grooved tube manufacturing apparatus 101 manufactures the inner grooved tube 204 having the fins 205 with a desired accuracy by controlling the torque of the auxiliary feeding device 130 while keeping the drawing force F1 by the winding drum 160 constant.
  • the inner grooved tube 204 can be manufactured with high productivity without complicating the control.
  • a predetermined range and a second auxiliary feed speed that serve as a reference for controlling the drawing force F1 are determined according to the material of the raw tube 201. Since it is set based on the speed, range and correlation according to the diameter, it can be processed corresponding to the load fluctuation due to the material and diameter of the raw tube 201. Therefore, it is possible to form the fin 205 with high accuracy regardless of the material and diameter of the raw tube 201 and to reduce the occurrence of breakage.
  • the inner grooved tube manufacturing apparatus 101 fixes the diameter reducing device 120 and the auxiliary feeding device 130 to the upstream movable table 182 that can move relative to the winding drum 160, and the raw tube 201 by the winding drum 160.
  • An upstream load detector 192 is provided for detecting the load of the upstream movable table 182 that moves relative to each other when it is pulled out.
  • the diameter reducing device 120, the auxiliary feeding device 130, the groove processing device 140, and the finishing device 150 are fixed to the entire movable table 184 that can move relative to the winding drum 160, and the entire movable table 184 is fixed to the entire movable table 184.
  • the auxiliary feed torque by the auxiliary feed apparatus 130 that has a large influence on the formation of the fin 205 can be estimated from the detection result by the upstream load detector 192, and the torque can be controlled.
  • the inner grooved tube 204 having the fins 205 with higher accuracy can be manufactured with high productivity.
  • the inner surface grooved pipe manufacturing apparatus 101 includes an upstream load detector 192 that detects a load applied to the upstream movable table 182 and an overall load detector 194 that is applied to the entire movable table 184.
  • the upstream load detection value V (T3) calculated 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 overall load detector 194, the upstream load detection value V ( The auxiliary feeder 130 may be torque controlled in consideration of T1).
  • the pulling force F1 by the winding drum 160 may be controlled in consideration of the downstream load detection value V (T2) detected by the overall load detector 194 in addition to the load difference value (T3). .
  • the inner surface grooved pipe manufacturing apparatus 101 includes the upstream load detector 192 for detecting the load applied to the upstream movable table 182 and the overall load detector 194 applied to the entire movable table 184, further thinning is achieved. Even if the twist angle (lead angle) of the fin 205 is further increased, the complexity of the control is increased, but the productivity of the internally grooved tube 204 in which the fin 205 with higher accuracy is formed is improved. can do.
  • the upstream load detector 192 and the entire load detector 194 are configured by the same device, the change curves of the values detected from both detectors are approximated, and the speed of the auxiliary feeding device 130 and the winding drum 160 are Torque can be adjusted with high accuracy.
  • the diameter reducing device 120 of this embodiment corresponds to a diameter reducing means.
  • the auxiliary feeding device 130 corresponds to the feeding assisting means
  • the groove processing device 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 control means
  • the auxiliary feed speed corresponds to the feed auxiliary speed
  • the auxiliary feed torque corresponds to the feed auxiliary torque
  • the upstream movable table 182 corresponds to the moving table
  • the entire movable base 184 corresponds to the base
  • the upstream load detector 192 corresponds to the moving table load detector
  • the total load detector 194 corresponds to the base 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 processed ball 326
  • the present invention is not limited only to the configuration of the second embodiment, and many embodiments can be obtained.
  • FIG. 7 is explanatory drawing of the manufacturing apparatus 312 of an inner surface grooved pipe
  • the inner surface grooved tube manufacturing apparatus 312 has a diameter reducing means 313 for reducing the diameter of the element tube 311a along the drawing direction X of the element tube 311a, and an inner surface of the element tube 311a.
  • a groove processing means 314 for forming a large number of grooves is provided, and an intermediate extraction portion 317 is provided between the diameter reducing means 313 and the groove processing means 314 for extracting the raw tube 311a reduced in diameter by the diameter reducing means 313. ing.
  • the diameter-reducing means 313 includes a diameter-reducing die 322 and a floating plug 323 that is disposed in the element tube 311a and reduces the diameter of the element tube 311a together with the diameter-reducing die 322.
  • the groove processing means 314 is rotatably connected to the floating plug 323 via a connecting rod 325 in the raw tube 311a, and has a grooved plug 324 having a plurality of grooves formed on the outer periphery, and an outer side of the raw tube 311a.
  • the raw tube 311a is composed of a plurality of processed balls 326 arranged to revolve around the tube axis while being pressed toward the grooved plug 324 side.
  • the outer diameter D o (mm) of the raw pipe 311 a and the diameter D of the reduced diameter die 322. 2 (mm), the diameter reduction ratio R D of the element tube 311a represented by R D ⁇ (D o ⁇ D 2 ) / D o ⁇ ⁇ 100 (%) is reduced to 30% or less in the diameter reducing means 313. It is set.
  • the outer diameter D 1 (mm) of the floating plug 323 and the diameter D 2 (mm) of the reduced diameter die 322 are set to satisfy D 1 ⁇ D 2 ⁇ 0.1.
  • revolution direction of the processed ball 326 is set in the reverse direction, and the processed pitch P (mm) of the processed ball 326 is set in a range of 0.2 ⁇ P ⁇ 0.7.
  • the processing pitch P (mm) is set to be in the range of 0.2 ⁇ P ⁇ 0.4.
  • the manufacturing apparatus 312 includes a diameter reducing means 313, an intermediate drawing portion 317, a groove processing means 314, a shaping die 315, and a drawing portion 316 along the drawing direction X from the upstream side to the downstream side.
  • the manufacturing apparatus 312 supports a movable base 333 that supports the reduced diameter portion 313, the intermediate extraction portion 317, and the groove processing means 314 so as to be movable in the drawing direction with respect to the fixed base 350, and the fixing of the movable base 333.
  • a load cell 328 that detects a load F that acts in response to movement relative to the table 350, and a control device 345 that controls the intermediate pull-out portion 317 and the pull-out portion 316 based on the load F detected by the load cell 328. Yes.
  • the diameter reducing means 313 includes the diameter reducing die 322 and the floating plug 323 as described above.
  • the diameter-reducing die 322 is formed in a cylindrical shape having a communication hole 322a communicating with the drawing direction X, and the communication hole 322a has an upstream portion (inlet side) in the drawing direction X as a downstream portion (outlet side). On the other hand, it is configured in a shape that opens toward the upstream side.
  • the floating plug 323 is formed in a cylindrical shape, and the outer periphery of the downstream portion is formed in a tapered shape.
  • the outer diameter of the floating plug 323 is set to D 1 (mm), and the inner diameter on the outlet side of the reduced diameter die 322 is set to D 2 (mm).
  • the groove processing means 314 includes a grooved plug 324, a plurality of processing balls 326, and a processing head 327 that holds the processing balls 326 from the outer peripheral side.
  • the processing head 327 is formed with a processing ball holding groove 327a having a semicircular cross section.
  • the plurality of processed balls 326 are held so as to revolve freely while pressing the surface of the raw tube 311a by the processed ball holding grooves 327a.
  • the plurality of processed balls 326 are held by the processed ball holding grooves 327a so that the revolution speed can be changed while pressing the surface of the raw tube 311a in either the forward direction or the reverse direction.
  • the shaping die 315 performs a process of smoothly shaping, for example, the distortion of the pipe surface caused by the pressing of the machining ball 326 in the grooving means 314 when the inner grooved pipe 311 passes.
  • the drawing portion 316 also has a winding drum 336 that winds up the processed inner surface grooved tube 311, and includes a motor M 1 that drives the winding drum 336, and the inner surface grooved tube 311 is driven by rotation of the motor M 1. Is wound around the winding drum 336.
  • the intermediate drawing portion 317 assists the drawing by the drawing device 316 by drawing the raw tube 311a in the drawing direction X between the reduced diameter portion 313 and the groove processing means 314. That is, the grooving by the grooving means 314 becomes a resistance when pulling out the raw tube 311a, and the pulling load during the grooving increases, but the pulling load applied to the raw tube 311a by the intermediate pulling portion 317 is increased. Can be dispersed.
  • the intermediate extraction portion 317 includes a pair of belts 342a and 342a arranged on the upper and lower sides or the left and right sides with respect to the raw tube 311a.
  • Each belt 342a, 342a are formed in a loop shape (endless) and is tensioned by a rotatable pulley 343 by the rotation of the motor M 2.
  • the belts 342a and 342a have a plurality of pads 344 arranged on the outer peripheral surface along the length direction.
  • the pad 344 is formed with a pad groove in which a cut surface with respect to the connecting direction of the plurality of pads 344 has an arc shape at a contact portion with the outer surface of the base tube 311a after the diameter reduction by the diameter reducing portion 313. is doing.
  • the intermediate withdrawal part 317 has a pad 344 configured to be pressed against the base pipe 311a surface by driving of the motor M 3.
  • a wiper 351 is provided on the upstream side of the intermediate extraction portion 317 to remove an oil film and foreign matter adhering to the outer surface of the raw tube 311a, and an intermediate shaping die 352 is provided on the downstream side.
  • the wiper 351 is provided to remove an oil film and foreign matter adhering to the outer surface of the raw tube 311a, and a through hole having a diameter slightly smaller than the outer diameter of the raw tube 311a is provided to pass the raw tube 311a.
  • a rubber cylindrical body formed in the central portion.
  • the intermediate shaping die 352 is provided to return the cross-sectional shape of the element tube 311a flattened by the intermediate extraction portion 317 to a shape close to a perfect circle, and has the same diameter as the floating die 322 depending on the shape of the element tube 311a. It is configured with a small die diameter.
  • the intermediate shaping die 352 is made of a material harder than the material of the metal element tube 311a such as metal or ceramic. Preferably, it is made of cemented carbide.
  • the movable table 333 is installed on the fixed table 350 via a plurality of wheels 333a so that the movable table 333 can be translated in the drawing direction or the opposite direction with respect to the fixed table 350.
  • Means 314, finishing section 315, intermediate drawing section 317, wiper 351 and intermediate shaping die 352 are installed in a state where they are housed in box 332.
  • the load cell 328 is provided on the fixed base 350 at the downstream end portion in the drawing direction of the movable table 333 so that the load F received from the movable table 333 according to the pulling force of the raw tube 311a can be detected.
  • the control unit 345 receives a load detection signal S in obtained by converting the load F detected by the load cell 328 into an electrical signal, and the motors M 1 , M 2 , M 3 of the extraction unit 316 and the intermediate extraction unit 317 according to a control program.
  • a control signal S out for controlling the driving of the signal is output.
  • control unit 345 temporarily stores an arithmetic unit (CPU) for executing signal analysis processing and arithmetic processing, a hard disk for storing necessary control programs, and the load detection signal S in.
  • an input unit such as a keyboard for inputting control parameters and a display unit such as a monitor can be appropriately provided.
  • the control unit 345 by controlling the driving of the motor M 3 of the intermediate withdrawal unit 317, and controls the pressing force by the pad 344 of the intermediate pullout portion 317 against base pipe 311a. By pressing the pad 344 against the raw tube 311a with an appropriate pressing force, the slip between the pad 344 and the raw tube 311a is reduced, and the variation in the load F is reduced.
  • control unit 345 may be configured to control other control parameters such as the rotation speed and acceleration, not limited to the rotation torque of the pulley 343.
  • the manufacturing method of the inner surface grooved tube 311 using the inner surface grooved tube manufacturing apparatus 312 described above includes a diameter reduction process step of reducing the diameter of the raw tube 311a in the process of moving the raw tube 311a in the drawing direction X.
  • An intermediate drawing is performed in which a groove machining step for forming a large number of grooves on the inner surface of the element tube 311a is performed, and the element tube 311a reduced in diameter in the diameter reduction process step is drawn during the diameter reduction process and the groove machining process. Perform the process.
  • the diameter reducing process is performed by a diameter reducing die 322 and a floating plug 323 which is disposed in the element pipe 311a and reduces the diameter of the element pipe 311a together with the diameter reducing die 322.
  • a grooved plug 324 that is rotatably connected to the floating plug 323 through a connecting rod 325 in the raw tube 311a and has a plurality of grooves formed on the outer periphery, and on the outer side of the raw tube 311a. This is performed with a plurality of processed balls 326 arranged to revolve around the tube axis while pressing the raw tube 311a toward the grooved plug 324 side.
  • the manufacturing apparatus 312 and the manufacturing method can achieve the following operational effects.
  • the diameter reduction ratio R D of the element tube 311a expressed by D 2 ) / D o ⁇ ⁇ 100 (%) is set to 30% or less in the diameter reduction means 313.
  • the outer diameter D 1 (mm) of the floating plug 323 and the diameter D 2 (mm) of the reduced diameter die 322 are set such that D 1 ⁇ D 2 ⁇ 0. It is set to be 1.
  • the processing pitch P (mm) is in the range of 0.2 ⁇ P ⁇ 0.7. It is set to become.
  • the processing pitch P (mm) of the processed ball 326 is set to 0.2 ⁇ P ⁇ . It is set to be in the range of 0.4.
  • Example 10 In Example 10, it was subjected to grooving experiment to investigate the effect on the processing by changing the radial contraction rate R D of the base pipe 311a at reduced diameter section 313.
  • machining pipes 311a were machined by setting machining conditions for each of Invention Examples 1 to 3 and Comparative Examples 1 and 2, and an internally grooved tube 311 was created.
  • the diameter reduction ratio RD was set to be 30% or less, and in Comparative Examples 1 and 2, the diameter reduction ratio RD was larger than 30%. Processing was performed under the following settings.
  • the processing result was evaluated by the variation in the groove depth in the longitudinal direction of the groove formed on the inner surface of the raw tube 311a after the grooving. Further, the variation in the depth of the groove in the longitudinal direction and the degree of stability of the load F detected at the time of diameter reduction by the load cell 328 installed in the diameter reduction means 313 are closely related. For this reason, when a load fluctuation occurs, it affects the groove shape (particularly the groove depth) formed on the inner surface of the raw tube 311a, and the magnitude of the load fluctuation is the same as the fluctuation of the groove depth in the longitudinal direction of the groove. Appears in size.
  • the processing result is “ ⁇ ” when the variation in the groove depth in the longitudinal direction indicating the stability of the load is 0 to 0.020 mm, and “ ⁇ ” when the variation is 0.021 to 0.050 mm.
  • the case of 0.051 mm or more was evaluated as “x”.
  • Table 5 shows the results of machining performed under the conditions of Invention Examples 1 to 3 and Comparative Examples 1 and 2.
  • Example 1 of the present invention was “ ⁇ ”
  • Examples 2 and 3 of the present invention were “ ⁇ ”
  • Examples 1 to 3 of the present invention obtained the desired internally grooved tube 311, In Comparative Examples 1 and 2, both were “x”, and the desired internally grooved tube 311 was not obtained.
  • the contact between the raw tube 311a and the reduced diameter die 322A is not stabilized by the thinning, the chatter phenomenon is likely to occur, and the thickness is reduced.
  • Example 1 to 3 of the present invention when the diameter reduction ratio RD is 30% or less and D 1 ⁇ D 2 ⁇ 0.1, the raw tube 311a after the diameter reduction processing is performed. since the outer diameter D f, becomes substantially the same as the diameter D 2 of the diameter reduction dies 322, the thickness T f of the base pipe 311a after diameter reduction is increased equal to or slightly thicker T o of the base pipe 311a Processing was realized.
  • Example 11 In Example 11, a grooving experiment was conducted to examine the influence on the machining by changing the engagement (D 1 -D 2 ) of the floating plug 323 and the reduced diameter die 322 in the diameter reducing means 313. In this processing experiment, the raw tube 311a was processed for each of the conditions of Invention Examples 4 to 8 and Comparative Example 3 to create an internally grooved tube 311.
  • (D 1 -D 2 ) is all set to 0.1 or more, and in Comparative Example 3, (D 1 -D 2 ) is set to be smaller than 0.1. Was processed.
  • Table 6 shows the results of machining performed under the machining conditions of Invention Examples 4 to 8 and Comparative Example 3.
  • the thickness of the raw tube 311a is not reduced, and conversely, the thickness may be increased within 0.01 mm, whereas (D 1 -D 2 ) is 0.1. If it is smaller, the diameter of the tube 311a is reduced while reducing the thickness, and the load is excessively applied, and as shown in the enlarged view of the region Z2 in FIG. Thinning occurs.
  • the contact area between the pad 344 and the raw tube 311a at the intermediate extraction portion 317 is fluctuated and a sufficient contact area cannot be secured, and load assistance at the intermediate extraction portion 317 is not possible. It becomes unstable.
  • the intermediate extraction portion 317 is provided, the number of contacts of the pads 344 is changed, or vibration due to repeated contact and release of the pads 344 with the base tube 311a is affected, so that conventional processing without the intermediate extraction portion 317 is performed. Compared with the method, the instantaneous fluctuation of the load becomes larger.
  • Example 12 In Example 12, a grooving experiment was conducted to examine the effect on machining by changing the machining pitch P. In this machining experiment, as in the conditions of Invention Examples 9 to 32 shown in Table 7, the inner surface is grooved under the machining conditions in which the machining pitch P is changed when the revolution direction of the machining ball 326 is the forward direction and the reverse direction. The tube 311 was processed.
  • Examples 9 to 32 of the present invention were obtained by processing the internally grooved tube 311 under the processing conditions satisfying the conditions of the present invention in which the reduction ratio RD was 30% or less.
  • Invention Examples 11 to 18 and Invention Examples 23 to 25 surrounded by a thick frame are obtained by processing the internally grooved tube 311 under particularly preferable processing conditions.
  • the revolution direction of the processed ball 326 is set to the reverse direction, and the processing is performed under the setting where the processing pitch P (mm) is 0.2 mm or more and 0.7 mm or less.
  • the revolving direction of the processed ball 326 was set to the positive direction, and the processing was performed under a setting in which the processing pitch P (mm) was 0.2 mm or more and 0.4 mm or less.
  • the revolution direction of the processed ball 326 is set to the reverse direction, and the processing pitch P (mm) is set to be smaller than 0.2 mm or larger than 0.7 mm.
  • the revolution direction of the processing ball 326 is set to the positive direction, and the processing pitch P (mm) is set to be smaller than 0.2 mm or larger than 0.4 mm.
  • Example 9 to 32 of the present invention the common tube 311a having an outer diameter of 9.53 mm and an inner diameter of 8.93 mm is used, and the other conditions are the same as shown in Table 4. Was processed.
  • the processing pitch P (mm) means that the processing ball 326 revolves around the base tube 311a by an angle equally distributed on the outer periphery of the base tube 311a by the number of processing balls 326 arranged on the outer periphery.
  • the distance the tube 311a travels in the drawing direction X is shown.
  • the processed tube 326 rotates while the outer periphery of the raw tube 311a rotates 90 degrees.
  • the moving distance P that 311a travels in the drawing direction X is set as the processing pitch P.
  • FIG. 10 is an explanatory diagram for explaining the processing pitch P schematically shown by partially omitting the vicinity of the groove processing means 314.
  • La, Ld, and Lb indicated by phantom lines in FIG. 10 are the three processed balls 326a, 326a, Reference numerals 326d and 326b indicate trajectories of pressing the raw tube 311a.
  • FIG. 10 shows a case where the revolution direction of the processed ball 326 is the reverse direction (the reverse direction to the rotation direction of the grooved plug 324).
  • the trajectories La, Lb, and Ld of the processed ball 326 are lowered to the right in FIG.
  • the processing results were evaluated by “groove formation” (whether or not the tube meat was unfilled) and “groove processing accuracy” (occurrence of aggression) formed on the inner surface of the raw tube 311a after grooving.
  • “egre” indicates an unfilled portion 401 of a material having a shape such that the fin 400 is notched in the thickness direction at the skirt of the inner surface fin 400 in the groove processing means 314. .
  • “Groove formation” is defined as “ ⁇ ” when the entire groove of the grooved plug 324 is filled with meat (having a groove with a predetermined depth) and without filling (having a predetermined depth). (Where no groove was formed) was evaluated as “ ⁇ ” or “ ⁇ ”. “ ⁇ ” is unfilled, but is in a practically usable range. Furthermore, “the processing accuracy of Groove” gouge is missing or gouges depth H e is what is within 10% of the fin Hem and " ⁇ ” gouges depth H e is within 30% of the fin Hem Those with a value of “ ⁇ ” were evaluated, and those with 30% or more were evaluated as “ ⁇ ” or “ ⁇ ”. “ ⁇ ” is gouge depth H e is equal to or more than 30% of the fin Hem, practically, is within the range that can be used.
  • Table 7 shows the results of the processing performed for each condition of Invention Examples 9 to 32.
  • Examples 9 to 32 of the present invention were any of “ ⁇ ”, “ ⁇ ”, and “ ⁇ ”, and there was no “ ⁇ ”. In particular, in Examples 11 to 18 and 23 to 25 of the present invention, all were “ ⁇ ” or “ ⁇ ”.
  • the depth of the angle is within 30% of the fin hem width, it is preferable that there is no possibility that the inner fin will fall when the heat exchanger is assembled into the aluminum fin in the post-processing.
  • inventive examples 11 to 18 and the inventive examples 23 to 25 have the inner grooved tube 311 of the inner grooved tube 311 under particularly preferable processing conditions in the examples of the present invention from the viewpoints of “groove formation” and “groove processing accuracy”. We were able to demonstrate that processing was possible.
  • revolution direction of the processed ball 326 is set to the reverse direction and the processing pitch P (mm) is set to be in the range of 0.2 ⁇ P ⁇ 0.7, or the revolution of the processed ball 326 is
  • the effectiveness of the present invention characterized by setting the direction to the positive direction and setting the machining pitch P (mm) to be in the range of 0.2 ⁇ P ⁇ 0.4 could be verified.
  • Example 13 In Example 13, a grooving experiment was conducted to examine the effect of changing the groove depth and twist angle of the grooved plug 324 in the grooving process. In this machining experiment, the machining pitch P of the machining balls 326 is changed to 0.20 mm, 0.40 mm, and 0.60 mm when the revolution direction of the machining balls 326 is the forward direction and the reverse direction, respectively. I did it.
  • Tables 8 to 10 show the results of experiments performed by changing the groove depth and twist angle of the grooved plug 324 and the processing pitch P of the processing balls 326 when the revolving direction of the processing balls 326 is the forward direction and the reverse direction, respectively. Indicates.
  • Table 8 shows the experimental results obtained by extracting the processing conditions in Tables 9 and 10 and a part of the processing results.
  • Example 12 the machining results were verified with respect to “groove formation” and “groove machining accuracy”, and all of these elements were “O” or “ ⁇ ”. Was evaluated as “x”, and “x” was not included in any of them, and “ ⁇ ” was included in one of them.
  • the processing pitch P can be set as large as 0.6 mm, for example.
  • Example 14 In Example 14, a grooving experiment was conducted to examine the effect of the revolution speed R (rpm) of the machining ball 326 on the machining.
  • the drawing speed at the time of machining the internally grooved tube 311 is V (m / min)
  • the revolution speed of the machining ball 326 is R (rpm)
  • the machining pitch of the machining ball 326 is P (mm)
  • the drawing speed V was set based on the formula (1) so that the machining pitch of the machining ball 326 is constant for each revolution speed of the machining ball 326 of 10,000 rpm, 30000 rpm, and 40000 rpm. Processing experiments similar to Example 12 and Example 13 were performed.
  • Example 12 As a result, even if the revolution speed of the processed ball 326 was changed, the same result as in Example 12 and Example 13 was obtained if the processing pitch P was the same.
  • the revolution speed of the processing ball 326 may be appropriately selected in consideration of the life of a processing tool such as the processing ball 326.
  • Example 15 In Example 15, a grooving experiment was conducted to examine the influence of the number C (number) of processed balls 326 arranged.
  • the drawing speed is changed by V (m / min) or the revolution speed R (rpm).
  • the processing pitch P (mm) can be kept constant.
  • Example 15 in each of the cases where the number C of the processed balls 326 is 3 and 5, the drawing speed is set to V so as to keep the processing pitch P (mm) constant based on the relationship of the expression (1). (M / min) and revolution speed were set to R (rpm), respectively, and processing experiments similar to those of Example 12, Example 13, and Example 14 were performed.
  • Example 12 As a result, even if the revolution speed of the processed ball 326 was changed, the same results as in Example 12, Example 13 and Example 14 were obtained as long as the processing pitch P was the same.
  • the number of processing balls 326 may be appropriately selected depending on the inner grooved tube 311 to be processed.
  • the processing ball 326 of this embodiment corresponds to a pressing tool.
  • the diameter reducing portion 313 corresponds to a diameter reducing means
  • the groove processing portion 314 corresponds to the groove processing means
  • the intermediate extraction portion 317 corresponds to the intermediate extraction device, but the present invention is not limited to the configuration of the third embodiment, and many embodiments can be obtained.
  • the manufacturing apparatus 510 ⁇ / b> A for inner surface grooved pipes in Embodiment 4A has a diameter reduction processing section 513, a groove processing section 514, from the upstream side in the pipe axial direction X to the downstream side (the drawing direction).
  • a diameter adjusting die 515 and a drawing part 516 (drawing part) are configured.
  • FIG. 13 is explanatory drawing of the manufacturing apparatus 510A of an internally grooved pipe
  • the manufacturing apparatus 510A includes a machining-related data detection unit 517 that detects machining-related data related to a machining load that occurs in the pipe axis direction in accordance with the drawing of the raw pipe 511a, and the processing-related data detection when a disconnection occurs.
  • a control unit 518 that determines that a disconnection has occurred based on the processing-related data detected by the unit 517 and outputs a drawing stop command to the drawing unit 516.
  • the diameter-reduction processing portion 513 includes a diameter-reducing die 522 and a floating plug 523 that is disposed in the element pipe 511a and reduces the diameter of the element pipe 511a together with the diameter-reducing die 522.
  • the diameter-reducing die 522 is formed in a cylindrical shape having a communication hole 522a that communicates with the tube axis direction X.
  • the communication hole 522a 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 523 is formed in a cylindrical shape, and the outer periphery of the downstream portion is formed in a tapered shape.
  • the grooved portion 514 is rotatably connected to the floating plug 523 via a plug rod 525 in the raw tube 511a, and has a grooved plug 524 having a plurality of grooves formed on the outer periphery, and an outer side of the raw tube 511a.
  • a plurality of rolling balls 526 arranged to revolve around the tube axis while pressing the raw tube 511a toward the grooved plug 524, and a pressing treatment for pressing the rolled ball 526 toward the raw tube 511a. It is comprised with the tool 527.
  • the pressing jig 527 has a ring-shaped processing head 528 that holds the rolling ball 526 from the outer peripheral side, and has a sharp-angled conical inner peripheral surface that expands toward the downstream side in the tube axis direction X. And a ring-shaped pressing member 529 that applies a pressure to each rolling ball 526.
  • the plurality of rolling balls 526 are held by the inner peripheral surface of the processing head 528 as a rolling tool that can revolve while pressing the surface of the raw tube 511a in either the forward direction or the reverse direction. .
  • the diameter adjusting die 515 performs a process of smoothly adjusting the diameter of a tube surface caused by pressing of the rolling ball 526 in the groove processing portion 514 when the inner grooved tube 511 passes therethrough.
  • the drawing unit 516 combines the drawing drum 531 for winding the processed of the inner surface grooved tube 511 (winding drum), a motor M 1 for driving the drawing drum 531, inner grooved by the rotation of the motor M 1
  • the drawing tube 511 is wound around the drawing drum 531 while being pulled.
  • the machining-related data detection unit 517 is provided in the groove machining unit 514 and includes a groove machining load measurement load cell 541 for measuring the machining load in the groove machining unit 514 and a movable table 543.
  • the movable table 543 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 542, and a pressing jig 527 for the groove processing portion 514 is installed at the upper part.
  • the groove processing load measuring load cell 541 is installed on the fixing jig 542a so as to be able to measure the processing load F in the tube axis direction X applied to the groove processing portion 514 via the movable table 543.
  • the control unit 518 receives a load detection signal S in obtained by converting the load F detected from the grooving load measurement load cell 541 into an electrical signal, and determines that a disconnection has occurred according to a control program to be described later. It outputs a stop signal S out to stop driving of the motor M 1 of the drawing portion 516 and.
  • control unit 518 includes an arithmetic unit (CPU) for executing signal analysis processing and arithmetic processing, a hard disk for storing necessary control programs, and the load detection signal S in for temporary storage.
  • CPU arithmetic unit
  • hard disk for storing necessary control programs
  • the load detection signal S in for temporary storage.
  • input means such as a keyboard for inputting control parameters
  • display means such as a monitor.
  • the inner grooved tube 511 can be manufactured by the manufacturing method described below using the manufacturing apparatus 510A described above.
  • a floating plug 523 and a grooved plug 524 rotatably connected to the floating plug 523 via a plug rod 525 are inserted into the raw tube 511a.
  • the processing head 528 is rotated while the raw tube 511 a is pulled out through the reduced diameter die 522 and the processing head 528.
  • a metal tube having good thermal conductivity such as copper, an alloy thereof, aluminum, or an alloy thereof can be used for the base tube 511a.
  • the raw tube 511a is reduced in diameter by the reduced diameter die 522 and the floating plug 523 along with the drawing.
  • a plurality of rolling balls 526 that revolve around the raw tube 511a as the machining head 528 rotates at the position of the grooved plug 524 presses the raw tube 511a.
  • the peripheral surface is pressed against the surface of the grooved plug 524, and the groove 550 on the peripheral surface of the grooved plug 524 is transferred to the inner surface of the raw tube 511a.
  • control unit 518 has a processing load F as processing related data detected by the groove processing load measurement load cell 541 when a disconnection occurs in the manufacturing process of the inner grooved tube 511 described above. Based on the above, it is determined that a disconnection has occurred, and control is performed to stop machining.
  • control unit 518 determines that a disconnection has occurred when the load detected by the load cell 541 for measuring a grooving load decreases to 20% or less during normal steady machining, and the motor M 1 of the drawing unit 516 A control program for stopping driving is executed.
  • the manufacturing apparatus 510A can provide the following operational effects.
  • the manufacturing apparatus 510A is configured to be able to determine that a disconnection has occurred based on the processing load F detected by the groove processing load measurement load cell 541 provided in the groove processing section 514, and upstream of the diameter adjusting die 515, In particular, even when a disconnection occurs at the groove processing portion 514 or upstream thereof, it can be quickly and reliably determined that the disconnection has occurred.
  • the rolling ball 526 directly presses the grooved plug 524 without passing through the raw tube 511a, and the grooved plug 524 Can be prevented from being damaged.
  • the manufacturing apparatus 510A performs control to determine that the tube is broken when the processing load F detected by the load cell 541 for measuring the grooving load during processing decreases to 20% or less of the processing load during normal steady processing. For this reason, it can be determined that the tube is broken when the load drops to the mechanical loss level.
  • the machining-related data detection unit 517 installs the groove machining unit 514 on the movable table 543, and loads the load in the tube axis direction X applied to the groove machining unit 514 via the movable table 543 to measure the groove machining load. Therefore, the load in the tube axis direction X applied to the groove machining portion 514 can be accurately measured.
  • tube in other embodiment is demonstrated.
  • the same reference numerals are given to the same configurations as the inner grooved tube manufacturing device 510A in the above-described embodiment 4A. The description is omitted.
  • the inner surface grooved pipe manufacturing apparatus 510 ⁇ / b> B is configured to reduce the diameter reducing portion 513, the groove processing portion 514, and the diameter adjusting die 515 along the tube axis direction X from the upstream side to the downstream side.
  • the drawing unit 516 is configured, and a processing related data detection unit 545 and a control unit 546 are provided.
  • the machining-related data detection unit 545 includes a reduced-diameter machining load measurement load cell 545 that is provided in the reduced-diameter machining unit 513 and measures a machining load F in the reduced-diameter machining unit 513.
  • the diameter reduction load measuring load cell 545 is attached to the diameter reduction die 522 and can detect the load in the tube axis direction X applied to the diameter reduction die 522.
  • the inner surface grooved tube manufacturing apparatus 510B according to Embodiment 4B does not include the groove processing load measurement load cell 541 and the movable base 543 in the groove processing portion 514.
  • the control unit 546 is input to load F detected from diameter reduction load measuring load cell 545 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 516 determines to have occurred.
  • control unit 546 determines that the tube is disconnected when the processing load F detected by the load cell 545 for measuring a reduced diameter processing load is reduced to 20% or less during normal steady processing, and determines the motor M 1 of the drawing unit 516.
  • a control program for stopping driving is executed.
  • the manufacturing apparatus 510B can provide the following operational effects.
  • the manufacturing apparatus 510 ⁇ / b> B is configured to determine that a disconnection has occurred based on the processing load F measured by the load cell 545 for measuring a diameter reduction load provided in the diameter reduction processing portion 513, and is upstream of the diameter adjusting die 515. Even when a disconnection occurs on the side, it can be quickly and reliably determined that the disconnection has occurred.
  • the load applied to the reduced diameter processing portion 513 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.
  • the inner surface grooved pipe manufacturing apparatus 510 ⁇ / b> C according to Embodiment 4C has a diameter reduction processing part 513 and an intermediate drawing part 551 (intermediate drawing part) along the pipe axis direction X from the upstream side to the downstream side.
  • a groove processing unit 514, a diameter adjusting die 515, and a drawing unit 516, and a processing related data detection unit 552 and a control unit 553 are provided.
  • FIG. 15 is an explanatory diagram of an inner grooved tube manufacturing apparatus 510C according to Embodiment 4C.
  • the intermediate drawing portion 551 assists the drawing by the drawing portion 516 by drawing the raw tube 511a in the tube axis direction X between the reduced diameter portion 513 and the groove processing portion 514. That is, the grooving by the grooving portion 514 becomes resistance when the raw tube 511a is drawn, and the drawing (drawing) load at the time of grooving increases, but the intermediate drawing portion 551 applies to the raw tube 511a.
  • the drawing load can be dispersed in the tube axis direction X, and as a result, the load applied to the groove processing portion 514 can be reduced.
  • the intermediate drawing portion 551 includes a pair of belts 554 arranged on the upper and lower sides or the left and right sides with respect to the raw tube 511a.
  • Each belt 554 is stretched by the pulley 5555 in a loop (endless) is configured to be rotated by the motor M 2.
  • the belt 554 has a plurality of pads 556 connected to the outer peripheral surface along the length direction.
  • the pad 556 is formed with a pad groove in which the cut surface with respect to the connecting direction of the plurality of pads 556 has an arcuate shape at the contact portion with the outer surface of the base tube 511a after the diameter reduction by the diameter reducing portion 513. is doing.
  • the intermediate drawing unit 551 presses the pad 556 to the base pipe 511a surface by driving of the motor M 3, or are retractably configuration.
  • a wiper 557 is provided on the upstream side of the intermediate drawing portion 551 to remove an oil film and foreign matter adhering to the outer surface of the raw pipe 511a, and an intermediate diameter adjusting die 558 is provided on the downstream side.
  • the wiper 557 is provided to remove an oil film and foreign matter adhering to the outer surface of the raw tube 511a, and has a through hole having a diameter slightly smaller than the outer diameter of the raw tube 511a in order to pass through the raw tube 511a.
  • a rubber cylindrical body formed in the central portion.
  • the intermediate diameter adjusting die 558 is provided to return the cross-sectional shape of the flat tube 511a flattened by the intermediate drawing portion 551 to a shape close to a perfect circle, and the diameter of the reduced diameter die 522 is changed according to the shape of the raw tube 511a. It is configured with the same or smaller die diameter.
  • the control unit 553, by controlling the driving of the motor M 3 of the intermediate drawing unit 551 can control the pressing force against the base pipe 511a by the pad 556 of the intermediate drawing section 551. By pressing the pad 556 against the base tube 511a with an appropriate pressing force, the slip between the pad 556 and the base tube 511a is reduced, and the fluctuation of the load F is reduced.
  • the processing related data detection unit 552 is an ammeter 552 that detects a current value (electrical 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 551. It is composed.
  • the manufacturing apparatus 510C does not include the groove processing load measurement load cell 541 and the movable base 543 in the groove processing portion 514, and does not include the load cell 545 for diameter reduction processing load measurement in the diameter reduction processing portion 513. .
  • control unit 553 includes a calculation unit that differentiates the current value detected by the ammeter 552, and includes a storage unit that stores the differential value as load-related data. Further, the control unit 553, when the differential value varies significantly beyond 5 ⁇ variations of steady state processing, determines that the cross tube, the motor M 1 of the drawing unit 516, the motor M 3 of the intermediate drawing section 551 A control program for outputting a drawing stop command is provided.
  • the internally grooved tube 511 can be manufactured using the manufacturing apparatus 510C described above.
  • the control unit 553 when the raw tube 511a is broken, it is determined that the disconnection has occurred based on the differential value obtained by differentiating the current value detected by the ammeter 552, and the processing is stopped. Specifically, according to the manufacturing method of the inner surface grooved tube 511, the amount of change in the differential value obtained by differentiating the current value detected by the ammeter 552 is measured, and when the fluctuation exceeds 5 ⁇ , it is determined that the tube is broken, and the drawing unit motor M 1 516, to stop the device, such as a motor M 2 of the intermediate drawing section 551.
  • the manufacturing apparatus 510 ⁇ / b> C can provide the following operational effects.
  • the manufacturing apparatus 510 ⁇ / b> C can reliably detect a broken tube generated upstream of the diameter adjusting die 515 before the grooved plug 524 is damaged.
  • the manufacturing apparatus 510C can determine that a disconnection has occurred based on a differential value obtained by differentiating a current value that is a command value of the motor load (driving force) of the intermediate drawing unit 551, the intermediate drawing unit 551 Even under a situation in which the load fluctuation is large due to the drawing assistance of the portion 551, it is possible to quickly and reliably detect the disconnection that has occurred on the upstream side of the intermediate drawing portion 551 or the intermediate drawing portion 551.
  • the load cell and torque gauge 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 an ammeter 552.
  • 510 C of inner surface grooved pipe manufacturing apparatuses of Embodiment 4C are not restricted to the structure which detects a disconnection based only on the said process related data detection part 552 (ammeter 552) with which the intermediate
  • the manufacturing apparatus 510C includes a groove processing load measurement load cell 541 in the groove processing unit 514 and / or a diameter reducing processing load measurement load cell 545 in the diameter reduction processing unit 513. It does not exclude the configuration for detecting the occurrence of disconnection at each location.
  • Example 16 Subsequently, when the tube 511a (inner surface grooved tube 511) is disconnected during the processing of the inner surface grooved tube 511 using the manufacturing apparatus of the present invention, the grooved plug 524, 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.
  • the manufacturing apparatuses 510A, 510B, and 510C of Embodiments 4A to 4C are used as the manufacturing apparatus of the present invention, and the related art is used as a comparative example of the manufacturing apparatuses 510A, 510B, and 510C of Embodiments 4A to 4C. This was performed using the manufacturing apparatus according to the above.
  • the processing load detection units 517, 545, and 552 are provided as appropriate, and the processing load detection units 517, 545, and 552 detect processing load related data.
  • Table 11 and FIG. 16 summarize the presence / absence of installation of the intermediate drawing unit 551, the type of the processing load detection units 517, 545, and 552, and the installation location of the intermediate drawing unit 551 for the manufacturing apparatuses 510A, 510B, and 510C of Embodiments 4A to 4C. As shown in FIG.
  • Table 11 is a table
  • FIG. 16 is a schematic diagram of a manufacturing apparatus in which the processing load detection unit is installed in each of the manufacturing apparatuses of Embodiments 4A and 4B and the comparative example, and the intermediate drawing unit is not installed.
  • FIG. 17 is a schematic diagram of a manufacturing apparatus in which an intermediate drawing unit is installed, showing the installation location of the processing load detection unit installed in the manufacturing apparatus of Embodiment 4C.
  • production location was made into nine places of the disconnection location a to i as shown in FIG. 16, FIG.
  • the disconnection points a to d are as shown in FIG. 16. Specifically, the disconnection point a is between the diameter adjusting die 515 and the drawing part 516, and the disconnection point b is within the diameter adjusting die 515.
  • the disconnection part c is in the groove processing part 514 or between the diameter reduction processing part 513 and the groove processing part 514, and the disconnection part d is , Between the payoff table 562 for supplying the raw pipe 511a from the inside of the reduced diameter processing portion 513 or from the upstream side of the reduced diameter processing portion 513 and the reduced diameter processing portion 513.
  • the disconnection points e to i are as shown in FIG. 17. Specifically, the disconnection point e is between the diameter adjusting die 515 and the drawing part 516, and the disconnection point f is within the diameter adjusting die 515. Or it is between the groove processing part 514 and the diameter adjusting die 515, the disconnection part g is in the groove processing part 514 or between the intermediate drawing part 551 and the groove processing part 514, and the disconnection part h is Between the reduced diameter processing portion 513 and the intermediate drawing portion 551, the disconnection point i is in the reduced diameter processing portion 513 or between the payoff table 562 and the reduced diameter processing portion 513.
  • 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, and 1 are respectively performed when the disconnection occurs at each of the disconnection locations a, b, c, and d using the manufacturing apparatus 510A of Embodiment 4A. -C, 1-d.
  • the disconnection detection experiments 2-a, 2-b, and 2 are performed when the disconnection occurs at each of the disconnection points a, b, c, and d using the manufacturing apparatus 510B of Embodiment 4B. -C, 2-d.
  • the disconnection detection experiment 3-e, 3-f is performed when the disconnection occurs at each of the disconnection locations e, f, g, h, i using the manufacturing apparatus 510C of Embodiment 4C. , 3-g, 3-h, 3-i.
  • FIGS. FIG. 18 to FIG. 29 are graphs showing the relationship between the machining load and time detected by the machining load detection unit appropriately provided in each machining unit in each disconnection detection experiment. It is assumed that a disconnection has occurred when the second has elapsed.
  • 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 531 described above.
  • FIGS. 18 to 21 show the 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 the disconnection from being erroneously detected.
  • the drawing load of the drawing drum 531 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 hundreds of minutes between the beginning and end of the lot, the load of the drawing drum 531 is further increased due to the difference in the annealing state before and after the copper pipe, uneven thickness, wear of the grooved plug 524, etc. There will be fluctuations.
  • the difference between the lots of copper pipes, the difference in the solids of the grooved plug 524, and the difference due to seasonal variation are larger.
  • the drawing load of the drawing drum 531 is about It fluctuates in the range of 1500N to 3000N.
  • disconnection detection line is raised 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. 18, until the cross tube occurs, drawing load drawing drum 531, although 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, it is possible to prevent the grooved plug 524 from being damaged by the rolled ball 526 by determining that the disconnection has occurred simultaneously with the occurrence of the disconnection and stopping the apparatus.
  • the result of the disconnection detection experiment 0-b is as shown in FIG.
  • the drawing load of the drawing drum 531 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. 19), and the fracture portion is At the same time as passing through the diameter adjusting die 515, the drawing load of the drawing drum 531 falls to a mechanical loss level lower than the broken tube detection line, so the control unit determines that the tube is broken and stops the apparatus.
  • 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.
  • 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. 19), the disconnection occurs before the fractured portion passes through the diameter adjusting die 515.
  • 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.
  • the drawing load of the drawing drum 531 drops at the same time as the disconnection occurs, but drops step by step every time the fractured portion passes through the groove processing portion 514 and the diameter adjusting die 515, and the fractured portion Until the diameter passes through the sizing die 515, the drawing load does not drop to a mechanical loss level lower than that of the disconnection detection line, and the controller determines that the disconnection has occurred until it finally passes through the sizing die 515. I can't.
  • the disconnection occurs at the disconnection location c that is upstream of the groove processing portion 514, but it is determined that the disconnection has occurred after the disconnection has occurred, and there is a delay in the time required to stop the apparatus. Therefore, during this time, the fractured portion passes through the grooved portion 514 having the grooved plug 524, and the rolling ball 526 directly contacts the grooved plug 524, so that the grooved plug 524 may be damaged.
  • points a and b in the waveform of the drawing load in FIG. 20 indicate that the fracture portion is passing through the groove processing portion 514 and the diameter-controlling die 515, respectively.
  • the result of the disconnection detection experiment 0-d is as shown in FIG.
  • the drawing load of the drawing drum 531 drops at the same time as the occurrence of the broken tube, as in the broken tube detection experiment 0-c, but the fractured portion is the reduced diameter processed portion 513, the groove processed portion 514, Each time it passes through the diameter die 515, it is lowered step by step, and the drawing load does not drop to a mechanical loss level lower than that of the disconnection detection line until it passes through the diameter adjustment die 515. It is not possible to determine that a disconnection has occurred until it passes.
  • the disconnection detection line is set to be 20% of the measurement load (processing load F) at the time of steady machining measured by the grooving load measuring unit 517 as a threshold for detecting the disconnection, When the measured load falls below the broken tube detection line, it is determined that the tube is broken, 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. 22, since the measurement load of the groove processing load measuring unit 517 falls to zero, the measurement load is lower than the disconnection detection line simultaneously with the occurrence of the disconnection, it is determined that the disconnection has occurred immediately. Yes, the device can be stopped without damaging the fluted plug 524.
  • the measured load drops to zero after the disconnection when the disconnection occurs on the downstream side of the groove processing portion 514.
  • the drawing of the raw pipe 511a by the drawing drum 531 occurs simultaneously with the generation of the disconnection. This is because it does not work completely up to 514.
  • the disconnection detection experiment 1-b can detect the disconnection immediately because the measurement load drops to zero as soon as the disconnection occurs. The device can be shut down without damaging 524. Note that the measurement load of the grooving load measurement unit 517 in the disconnection detection experiment 1-b has substantially the same waveform as that in FIG. 22, and thus a graph showing the relationship between the machining 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. 23, the measurement load of the grooving load measurement unit 517 does not drop simultaneously with the occurrence of the broken tube. This is because, when a disconnection occurs at the disconnection point c that is upstream of the groove processing portion 514, even if the disconnection occurs until the fractured portion passes the groove processing portion 514, the raw pipe by the drawing drum 531 This is because the drawing of 511a acts up to the groove processing portion 514.
  • the control portion descends to zero, which is lower than the cut-off detection line. Determine and stop the device.
  • the apparatus in the case of the disconnection location c, the apparatus cannot be stopped simultaneously with the occurrence of the disconnection, but the disconnection has occurred at the same time as the fracture portion passes the groove processing portion 514. Since the determination and the apparatus can be stopped immediately, it is possible to prevent the grooved plug 524 from being damaged.
  • the fracture portion passes through the groove processing portion 514, and further the diameter adjusting die. It cannot be determined that the disconnection has occurred until it passes through 515 (see FIG. 20). That is, the rolling ball 526 comes into contact with the grooved plug 524 for a few seconds while the fracture portion passes between the groove processing portion 514 and the diameter adjusting die 515 and passes through the diameter adjusting die 515, and the groove The plug 524 will be damaged.
  • the fracture portion is between the groove processing part 514 and the diameter adjusting die 515 and the diameter adjusting die compared to the manufacturing apparatus of the comparative example. Since the apparatus can be stopped quickly only while passing through 515, it is possible to prevent the grooved plug 524 from coming into contact with the rolled ball 526 and being damaged.
  • the manufacturing apparatus 510A of Embodiment 4A cannot determine that the disconnection has occurred simultaneously with the occurrence of the disconnection, but the fracture portion is reduced in diameter.
  • the measurement load of the groove processing load measurement portion 517 drops to zero (see point a in the load waveform in FIG. 24), so the passage through the groove processing portion 514
  • the measurement load of the reduced diameter processing load measuring unit drops to zero at the same time that the measured load falls to zero, which is lower than the broken line detection line, and the occurrence of broken pipe immediately.
  • the determination can be made, and the apparatus can be stopped without damaging the grooved plug 524.
  • the measurement load of the groove processing load measuring unit 517 in the disconnection detection experiments 2-b and 2-c has substantially the same waveform as that in FIG. 25, and therefore the graph showing the relationship between the processing load and the elapsed time is omitted. To do.
  • 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 513.
  • the controller descends to zero, and the control unit determines that a disconnection has occurred and stops the apparatus.
  • the apparatus cannot be stopped simultaneously with the occurrence of the disconnection, but it is determined that the disconnection has occurred at the same time as the fractured portion passes through the reduced diameter processing portion 513, and the fractured portion is Since the apparatus can be stopped before passing through the grooved portion 514, it is possible to prevent the grooved plug 524 from being damaged.
  • the drawing load in the intermediate drawing unit 551 is actually due to various factors such as the state of the raw pipe 511a (copper pipe) before the machining, the state of the apparatus, and the machining environment even during the steady machining. The amount of change increases.
  • the disconnection can be accurately determined by detecting the occurrence of the disconnection using the differential value of the drawing load as in the manufacturing apparatus 510C of the embodiment 4C.
  • FIG. 27 is a graph showing the drawing load and the amount of load change (differential value) in the intermediate drawing unit 551 before and after the occurrence of the broken tube, and the drawing load is plotted on the left side in FIG. The amount of change in the load is indicated on the right side in FIG.
  • the disconnection detection experiments 3-f and 3-g have a change amount (differential value) of the drawing load of the intermediate drawing portion 551 exceeding 5 ⁇ 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 524.
  • the measurement load of the intermediate drawing portion 551 in the disconnection detection experiments 3-f and 3-g has substantially the same waveform as that in FIG. 27, and thus the graph showing the relationship between the machining load and the elapsed time is omitted.
  • a disconnection occurs in the intermediate drawing portion 551 or at a disconnection location h upstream of the intermediate drawing portion 551.
  • the amount of change (differential value) in the drawing load of the drawing unit 551 changes until it exceeds 5 ⁇ , and it can be immediately determined that disconnection has occurred, and the apparatus can be stopped without damaging the grooved plug 524.
  • the load of the intermediate drawing portion 551 and the change amount (differential value) of the intermediate drawing portion 551 do not drop as soon as the broken tube is generated. Since the disconnection occurs at the disconnection location i upstream of the diameter reducing portion 513, the drawing load of the intermediate drawing portion 551 is not affected until the fracture portion passes the diameter reducing portion 513. Because.
  • the amount of change (differential value) in the load of the intermediate drawing portion 551 changes in the same manner as the disconnection detection experiment 3-h until the occurrence of disconnection occurs. The determination can be made, and the apparatus can be stopped without damaging the grooved plug 524.
  • the grooved plug 524 was directly pressed against the rolled ball 526 and was damaged depending on the location where the disconnection occurred.
  • each of the manufacturing apparatuses of Embodiments 4A to 4C determines that a tube break has occurred during processing before the grooved plug 524 is damaged by the rolled ball 526, and stops processing. I was able to.
  • the grooved plug 524 can be prevented from being damaged by the inner grooved tube manufacturing apparatus and method of the present invention.
  • the diameter-reduction processing portion 513 of this embodiment corresponds to the diameter-reducing means of the present invention.
  • the groove processing portion 514 corresponds to the groove processing means
  • the drawing unit 516 corresponds to drawing means
  • the intermediate drawing unit 551 corresponds to the intermediate drawing means
  • the measurement load measured by the machining-related data detection units 517 and 545 or the current measured by the ammeter 552 corresponds to the machining-related data
  • Processing-related data detection units 517, 545, 552 correspond to processing-related data detection means
  • Control units 518, 546, and 553 including a calculation unit and a storage unit correspond to the disconnection determination unit
  • the groove processing load measuring load cell 541 corresponds to the groove processing load measuring means
  • the diameter reducing load measuring load cell 545 corresponds to the diameter reducing load measuring means
  • the differential value of the drawing load of the intermediate drawing unit 551 corresponds to the load related data
  • the calculation unit of the ammeter 552 and the control unit 553 corresponds

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Metal Extraction Processes (AREA)

Abstract

L’invention concerne un tuyau qui comporte une surface intérieure rainurée, qui présente d’excellentes propriétés de conduction thermique, peut être fabriqué sous une forme compacte et légère, et permet de préserver les ressources. L’invention concerne également un procédé et un appareil de fabrication de ce tuyau à surface intérieure rainurée, qui permettent de fabriquer ce dernier de manière efficace et stable. L’appareil qui est utilisé pour fabriquer le tuyau à surface intérieure rainurée est muni : d’un moyen de réduction du diamètre destiné à étirer un tuyau de base afin d’en réduire le diamètre, et d’un moyen de formation de rainures destiné à former un grand nombre de rainures sur la surface intérieure du tuyau de base. Si, par exemple, l’angle de torsion d’une rainure par rapport à l’axe central du tuyau est β (°) et l’angle au sommet d’une ailette qui est formée entre des rainures adjacentes est α (°), alors β est compris entre 30 et 60 et α est compris entre 5 et 20. Si le diamètre extérieur est D (mm), la profondeur des rainures est H (mm) et l’aire de la section dans la direction axiale du tuyau est Ac (mm2), alors D est inférieur ou égal à 6, H est supérieur ou égal à 0,07 et Ac < 0,8 × D.
PCT/JP2009/006674 2008-12-08 2009-12-07 Tuyau comportant une surface intérieure rainurée, appareil de fabrication et procédé de fabrication de celui-ci WO2010067576A1 (fr)

Priority Applications (2)

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CN200980150021.9A CN102245323B (zh) 2008-12-08 2009-12-07 内表面带槽管、其制造装置及其制造方法
KR1020117014300A KR101278827B1 (ko) 2008-12-08 2009-12-07 내면 홈 형성 관, 그 제조 장치 및 그 제조 방법

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JP2008312016A JP5227771B2 (ja) 2008-12-08 2008-12-08 内面溝付管及びその製造方法
JP2008-312016 2008-12-08
JP2009032645A JP5128515B2 (ja) 2009-02-16 2009-02-16 内面溝付管の製造装置及び製造方法
JP2009-032645 2009-02-16
JP2009-125936 2009-05-26
JP2009125936A JP5275904B2 (ja) 2009-05-26 2009-05-26 内面溝付管の製造装置及び製造方法
JP2009273044A JP5356195B2 (ja) 2009-12-01 2009-12-01 内面溝付管の製造装置およびその製造方法
JP2009-273044 2009-12-01

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CN104097038A (zh) * 2013-04-03 2014-10-15 昭和电工株式会社 热管式热交换装置的制造方法
JP6169538B2 (ja) * 2014-07-18 2017-07-26 三菱アルミニウム株式会社 内面螺旋溝付管の製造方法および製造装置
KR102358954B1 (ko) * 2020-05-26 2022-02-08 부곡스텐레스(주) 로드셀을 활용한 인발기 자동 제어 시스템
CN112044800A (zh) * 2020-08-25 2020-12-08 宁波思密德机电科技有限公司 一种全自动轴承检测径向间隙的机械

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JP2008036640A (ja) * 2006-08-01 2008-02-21 Furukawa Electric Co Ltd:The 内面溝付管の製造装置及び製造方法
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US10167140B2 (en) 2016-03-08 2019-01-01 Muhr Und Bender Kg Device and method for transporting elongated metal material

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CN102245323A (zh) 2011-11-16
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MY167025A (en) 2018-07-31
KR20110089189A (ko) 2011-08-04

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