US20070144722A1 - Tube production method, heat-exchange tube produced by the method and heat exchanger using the heat-exchange tube - Google Patents

Tube production method, heat-exchange tube produced by the method and heat exchanger using the heat-exchange tube Download PDF

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Publication number
US20070144722A1
US20070144722A1 US10/583,087 US58308704A US2007144722A1 US 20070144722 A1 US20070144722 A1 US 20070144722A1 US 58308704 A US58308704 A US 58308704A US 2007144722 A1 US2007144722 A1 US 2007144722A1
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US
United States
Prior art keywords
tube
slit
producing
body portion
heat
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Abandoned
Application number
US10/583,087
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English (en)
Inventor
Yoshifumi Matsuzaki
Soichi Kato
Jun Akaike
Hiromichi Ito
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Valeo Thermal Systems Japan Corp
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Valeo Thermal Systems Japan Corp
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Assigned to VALEO THERMAL SYSTEMS JAPAN CORPORATIONS reassignment VALEO THERMAL SYSTEMS JAPAN CORPORATIONS ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AKAIKE, JUN, MATSUZAKI, YOSHIFUMI, ITO, HIROMICHI, KATO, SOICHI
Publication of US20070144722A1 publication Critical patent/US20070144722A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D21/00—Machines or devices for shearing or cutting tubes
    • 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
    • B21C37/151—Making tubes with multiple passages
    • 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
    • B21C37/156—Making tubes with wall irregularities
    • B21C37/157—Perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0012—Brazing heat exchangers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/002—Precutting and tensioning or breaking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0391—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits a single plate being bent to form one or more conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
    • F28F3/044—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being pontual, e.g. dimples
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/14—Heat exchangers

Definitions

  • the present invention relates to a method of producing a tube comprising a tube body portion constituting an outer hull of flow passages, and flow passage dividers for dividing the flow passages, a heat-exchange tube produced by this method, and a heat exchanger using the heat-exchange tube.
  • heat-exchange tube a flat type which has a tube body portion constituting an outer hull of flow passages, and flow passage dividers for dividing the flow passages.
  • Known producing methods thereof include a method that forms by extruding a tube body portion and flow passage dividers into one body, and a method that forms by rolling a strip material while disposing flow passage dividers within the tube body portion and then brazing the tube contact portions of the flow passage dividers to the inner surface of the tube body portion.
  • a composition of tube material is limited in view of the extrusion property of the material, but in a case where the heat-exchange tube is formed by rolling, the flexibility of selecting the composition increases, and a material having a high strength and high corrosion resistance can be obtained.
  • the roll forming of a thin material can provide a more precise and complex shape in comparison with the extrusion forming, and it is advantageous in making the heat-exchange tube precise and small.
  • a material which has a sacrifice material previously clad on the surface which becomes an outside surface of the tube body portion can be used to further improve the corrosion resistance of the heat-exchange tube. Therefore, the heat-exchange tube can also be made thin.
  • the heat-exchange tube is formed by roll forming, as the flow passage divider, beads are provided by forming the material of the tube body portion, or corrugated inner fins formed of a material different from that of the tube body portion are disposed. And, the tops of the beads or those of the inner fins are brazed to the inner surface of the tube body portion.
  • Such a heat-exchange tube is cut to a prescribed length in its production process.
  • a method of cutting the tube is also disclosed in the following Patent Documents 1 through 13.
  • Patent Documents related to the present invention are as follows.
  • Patent Document 1 Japanese Patent No. 2608802
  • Patent Document 2 Japanese Patent Laid-Open Publication No. Hei 2-198798
  • Patent Document 3 Japanese Patent Laid-Open Publication No. Hei 2-262911
  • Patent Document 4 Japanese Patent Laid-Open Publication No. Hei 3-124337
  • Patent Document 5 Japanese Patent Laid-Open Publication No. Hei 6-63814
  • Patent Document 6 Japanese Patent Laid-Open Publication No. Hei 7-256509
  • Patent Document 7 Japanese Patent Laid-Open Publication No. Hei 9-70711
  • Patent Document 8 Japanese Patent Laid-Open Publication No. Hei 10-138035
  • Patent Document 9 Japanese Patent Laid-Open Publication No. Hei 11-320245
  • Patent Document 10 Japanese Patent Laid-Open Publication No. 2000-210812
  • Patent Document 11 Japanese Patent Laid-Open Publication No. 2002-233913
  • Patent Document 12 Japanese Patent Laid-Open Publication No. 2002-46015
  • Patent Document 13 Japanese Patent Laid-Open Publication No. 2003-11018
  • the present invention has been made in view of the above circumstances and has an object to obtain a better tube by rationalizing the cutting of a roll formed tube having flow passage divider.
  • the present invention also provides a heat exchanger having the good tubes.
  • the invention recited in claim 1 of the application is a method of producing a tube which has a tube body portion constituting an outer hull of flow passages and flow passage dividers for dividing the flow passages, comprising a roll forming process to form the tube, a cutting process to cut the tube to a predetermined length after the roll forming process, and a brazing process to braze the tube contact portions of the flow passage dividers to the inner surface of the tube body portion after the cutting process, wherein the cutting process forms a slit in the tube so as to concentrate a stress on the slit, thereby the tube cutting starts from the slit as a starting point; and the slit is formed in only the tube body portion between the tube body portion and the flow passage dividers.
  • the invention recited in claim 2 of the application is a method of producing a tube which has a tube body portion constituting an outer hull of flow passages, and flow passage dividers for dividing the flow passages, comprising a roll forming process to form the tube, a cutting process to cut the tube to a predetermined length after the roll forming process, and a brazing process to braze the tube contact portions of the flow passage dividers to the inner surface of the tube body portion after the cutting process, wherein the cutting process forms a slit in the tube so as to concentrate a stress on the slit, thereby the tube starts from the slit as a starting point; and the slit is formed ranging from the tube body portion to the tube contact portions of the flow passage divides.
  • the invention recited in claim 3 of the application is the method of producing a tube according to claim 1 or 2 , wherein the slit is formed by moving a cutter blade in parallel to the surface of the tube.
  • the invention recited in claim 4 of the application is the method of producing a tube according to claim 1 or 2 , wherein the slit is formed by moving a disk cutter in parallel to the surface of the tube.
  • the invention recited in claim 5 of the application is the method of producing a tube according to any of claims 1 through 4 , wherein the tube is pulled in the longitudinal direction to concentrate a stress on the slit.
  • the invention recited in claim 6 is the method of producing a tube according to claim 5 , wherein the roll forming process and the cutting process are performed while conveying a workpiece continuously, and the tube is pulled in a longitudinal direction with feed rollers disposed on the downstream side of a position, where the slit formation is performed, in a conveying direction and a conveying velocity provided by the feed rollers set to be faster than a conveying velocity in the roll forming process.
  • the invention recited in claim 7 of the application is the method of producing a tube according to claim 5 , wherein the roll forming process and the cutting process are performed while conveying a workpiece continuously, and the tube is pulled in a longitudinal direction by holding the upstream and downstream sides of a portion, where the slit is formed, in a conveying direction by means of a pair of clamps, and expanding a space between the pair of clamps relatively.
  • the invention recited in claim 8 of the application is the method of producing a tube according to any of claims 1 through 4 , wherein a stress is concentrated on the slit by applying a load to the tube in a direction different from its longitudinal direction.
  • the invention recited in claim 9 of the application is the method of producing a tube according to claim 8 , wherein feed rollers are disposed offset with respect to the longitudinal direction of the tube; and the tube passes through the feed rollers after the slit is formed, thereby a load is applied in a direction different from the longitudinal direction of the tube.
  • the invention recited in claim 10 of the application is the method of producing a tube according to claim 8 , wherein the tube is oscillated, thereby a load is applied in a direction different from the longitudinal direction of the tube.
  • the invention recited in claim 11 of the application is the method of producing a tube according to any of claims 1 through 10 , wherein the tube is a flat type and has a thickness of 0.8 to 1.7 mm.
  • the invention recited in claim 12 of the application is the method of producing a tube according any of claims 1 through 11 , wherein a material of the tube body portion has a thickness of 0.15 to 0.25 mm.
  • the invention recited in claim 13 of the application is the method of producing a tube according to any of claims 1 through 12 , wherein the flow passage dividers are beads formed by forming a material of the tube body portion, and the tops of the beads are brazed to the inner surface of the tube body portion.
  • the invention recited in claim 14 of the application is the method of producing a tube according to any of claims 1 through 12 , wherein the flow passage dividers are provided by inner fins which are formed of a member different from that of the tube body portion.
  • the invention recited in claim 15 of the application is the method of producing a tube according to claim 14 , wherein the inner fins are corrugate type, and the tops of the inner fins are brazed to the inner surface of the tube body portion.
  • the invention recited in claim 16 of the application is the method of producing a tube according to claim 15 , wherein the inner fin has a width of 0.3 to 1.4 mm in an amplitude direction.
  • the invention recited in claim 17 of the application is the method of producing a tube according to claim 15 or 16 , wherein a material of the inner fins has a thickness of 0.05 to 0.10 mm.
  • the invention recited in claim 18 of the application is the method of producing a tube according to any of claims 15 through 17 , wherein the tops of the inner fin have a pitch of 0.6 to 2.0 mm.
  • the invention recited in claim 19 of the application is a heat-exchange tube, which is produced by the production method according to any of claims 1 through 18 .
  • the invention recited in claim 20 of the application is a heat exchanger comprising the heat-exchange tubes as recited in claim 19 .
  • FIG. 1 is an explanatory diagram showing the front of a heat exchanger according to an embodiment of the invention (First embodiment).
  • FIG. 2 is an explanatory diagram showing a longitudinal section of a heat-exchange tube according to the embodiment of the invention (First embodiment).
  • FIG. 3 is an explanatory diagram showing a roll forming process and cutting process according to the embodiment of the invention (First embodiment).
  • FIG. 4 is an explanatory diagram showing a brazing process according to the embodiment of the invention (First embodiment).
  • FIG. 5 is an explanatory diagram showing a slit forming method according to the embodiment of the invention (First embodiment).
  • FIG. 6 is an explanatory diagram showing a slit forming method according to the embodiment of the invention (First embodiment).
  • FIG. 7 is an explanatory diagram showing a slit forming method according to the embodiment of the invention (First embodiment).
  • FIG. 8 is an explanatory diagram showing a slit forming method according to the embodiment of the invention (First embodiment).
  • FIG. 9 is an explanatory diagram showing a longitudinal section of a heat-exchange tube according to an embodiment of the invention (Second embodiment).
  • FIG. 10 is an explanatory diagram showing a slit forming method according to the embodiment of the invention (Second embodiment).
  • FIG. 11 is an explanatory diagram showing a slit forming method according to the embodiment of the invention (Second embodiment).
  • FIG. 12 is an explanatory diagram showing a slit forming method according to the embodiment of the invention (Second embodiment).
  • FIG. 13 is an explanatory diagram showing a slit forming method according to the embodiment of the invention (Second embodiment).
  • FIG. 14 is an explanatory diagram showing a longitudinal section of a heat-exchange tube according to the embodiment of the invention (Second embodiment).
  • FIG. 15 is an explanatory diagram showing a cutting process according to an embodiment of the invention (Third embodiment).
  • FIG. 16 is an explanatory diagram showing a cutting process according to an embodiment of the invention (Fourth embodiment).
  • FIG. 17 is an explanatory diagram showing a cutting process according to an embodiment of the invention (Fifth embodiment).
  • a heat exchanger 10 shown in FIG. 1 is a radiator of a refrigeration cycle for air-conditioning of a car interior mounted on an automobile.
  • the heat exchanger 10 has a core 30 which is formed by alternately stacking heat exchange tubes 100 and radiation fins 20 and a pair of tanks 40 which are connected to communicate with either ends in the longitudinal directions of the individual heat exchange tubes 100 .
  • a reinforcing member 50 is disposed on the top and bottom ends of the core 30 , and the both ends of the reinforcing members 50 in the longitudinal direction are supported by the tanks 40 .
  • an inlet 41 and an outlet 42 for a medium are disposed at required portions of the tanks 40 , and the medium flows in through the inlet 41 flows through the heat exchange tubes 100 while performing heat exchange with heat conducted to the core 30 and flows out through the outlet 42 .
  • the heat exchange tubes 100 , the fins 20 , the tanks 40 , the inlet 41 , the outlet 42 and the side plates 50 which are component members of the heat exchanger 10 are made of aluminum or aluminum alloy members and assembled into one body. And, the assembly is brazed as one body in a furnace. To perform the brazing in the furnace, a brazing material and flux are disposed at the required portions of the individual members.
  • the heat exchange tube 100 of this embodiment shown in FIG. 2 is a flat type having a tube body portion 200 which constitute the outer hull of flow passages 101 and flow passage dividers 210 for dividing the flow passages 101 .
  • the heat exchange tube 100 has thickness t tube of 0.8 to 1.7 mm and width W tube of 8 to 25 mm.
  • the tube body portion 200 is formed by rolling an aluminum or aluminum alloy strip material, and the material of the tube body portion 200 has thickness t 1 of 0.15 to 0.25 mm. Both ends of the material in its width direction are mutually engaged and brazed at an end 102 of the heat exchange tube 100 in its width direction such that they are not separated.
  • Other end 103 of the heat exchange tube 100 in its breadth direction is formed by bending approximately the center of the material.
  • the flow passage dividers 210 shown in FIG. 2 are beads 210 formed of the material of the tube body portion 200 .
  • Tops 211 of the beads 210 which are tube contact portions of the flow passage dividers, are brazed to the inner surface of the tube body portion 200 .
  • a brazing material required for brazing of the heat exchange tubes 100 is previously clad to the inner surface of the material of the tube body portion 200 . Otherwise, it may be structured so that the brazing material, which is melted from other members constituting the heat exchanger 10 , is drawn into required portions by capillary action.
  • an Al-Zn alloy layer may be disposed as the sacrifice layer to improve the corrosion resistance of the heat exchange tube 100 .
  • this production method includes a roll forming process (process 1 ) for forming the heat exchange tube 100 , a cutting process (process 2 ) for cutting the tube 100 to a predetermined length after the roll forming process, and a brazing process (process 3 ) for brazing the tops 211 of the beads 210 , which are tube contact portions of the flow passage dividers 210 , to the inner surface of the tube body portion 200 after the cutting process, and particularly the roll forming process and the cutting process are performed by continuously conveying a workpiece.
  • the roll forming process (process 1 ) is performed by supplying a material 1 of the strip shaped tube body portion 200 from first feed rollers 2 to a roll forming machine 3 .
  • the roll forming machine 3 has a plurality of forming rollers 3 a disposed continuously.
  • the material 1 is plastically deformed gradually while being passed through the individual forming rollers 3 a and formed into the heat exchange tube 100 having a predetermined shape.
  • a slit is formed in a required portion of the heat exchange tube 100 (more specifically, is an intermediate forming member of the heat exchange tube 100 ) formed by the roll forming process by a cutter device 4 , and a stress is concentrated on the slit to cut the heat exchange tube 100 from the slit as a starting point.
  • the cutter device 4 is a flying type that moves a cutter in compliance with a conveying speed of the heat exchange tube 100 . The cutter device 4 and the slit will be described later in detail.
  • This embodiment is structured to concentrate a stress on the slit by pulling the heat exchange tube 100 in the longitudinal direction. Specifically, it is structured to pull the heat exchange tube 100 in the longitudinal direction by disposing second feed rollers 5 in a later stage of the cutter device, namely at a downstream side in the conveying direction than the portion where the slit is formed, and setting a conveying velocity v 2 of the second feed rollers 5 to be faster than a conveying velocity v 1 in the roll forming process.
  • the heat exchange tubes 100 and other members constituting the heat exchanger 10 are assembled by using a jig, and an assembly 10 a is placed on a conveyer 6 and conveyed into a furnace 7 .
  • the assembly 10 a is heated in the furnace 7 to braze the required portions to provide the heat exchanger 10 . Namely, the tops 211 of the beads and both ends of the material in the width direction are brazed.
  • the cutter device 4 of this embodiment is provided with a pair of cutters 4 a which are opposed to each other as shown in FIG. 5 or FIG. 6 to form slits by moving the blades of the individual cutters 4 a in parallel to both surfaces of the heat exchange tube 100 in a flattened direction. It is structured to fix the heat exchange tube 100 with a cramp when the slits are formed.
  • the cutter device 4 shown in FIG. 5 has the pair of cutters 4 a moved in the same direction
  • the cutter device 4 shown in FIG. 6 has the pair of cutters 4 a moved in the opposed directions.
  • the direction of moving the cutters 4 a is determined appropriately considering a balance and the like of a load applied to the heat exchange tube 100 .
  • the cutter device 4 may be provided with a pair of mutually opposed disk cutters 4 b as shown in FIG. 7 or FIG. 8 to make a slit in both surfaces of the heat exchange tube 100 in a flattened direction by moving the individual disk cutters 4 b in parallel to each other.
  • the cutter device 4 shown in FIG. 7 moves the pair of disk cutters 4 b in the same direction
  • the cutter device 4 shown in FIG. 8 moves the pair of disk cutters 4 b in mutually opposed directions.
  • the direction of moving the disk cutters 4 b is determined appropriately considering a balance or the like of a load applied to the heat exchange tube 100 .
  • the slits are formed in only the tube body portion 200 between the tube body portion 200 and the beads 210 or formed ranging from the tube body portion 200 to the tops 211 of the beads 210 .
  • a relationship between a slit depth d kerf and thickness t 1 of the material of the tube body portion 200 is: (1 ⁇ 2) ⁇ t 1 ⁇ d kerf ⁇ 2 ⁇ t 1 , more preferably (3 ⁇ 4) ⁇ t 1 ⁇ d kerf ⁇ ( 3/2) ⁇ t 1 , and most preferably d kerf ⁇ t 1 .
  • the heat exchange tube 100 of this embodiment was designed pursuing a better performance on the basis of the existing production technology.
  • This heat exchange tube 100 is formed to be very precise and thin, and when it is cut, it is quite important to prevent the occurrence of burrs on the cut surface and the deformation of the tube body portion 200 and the beads 210 in order to secure the performance of the heat exchange tube 100 .
  • the present inventors have devised a structure in that a slit to start cutting is formed in only the tube body portion 200 between the tube body portion 200 and the beads 210 considering the considerable deformation or the like of the beads 210 when the heat exchange tube 100 is cut before the tops 211 of the beads 210 are brazed, or a slit to start cutting is formed from the tube body portion 200 to the tops 211 of the beads 210 , and has confirmed by experiments that the above structure is very effective.
  • the above equations generally show a relationship between good d kerf and t 1 obtained by the experiments. It is determined whether or not the slit is formed to reach the tops 211 of the beads 210 , depending on a case considering a shape of the beads 210 and a stress or the like at the time of forming the slit. In other words, it should be noted that when the slit is formed to reach the tops 211 of the beads 210 , a force required for cutting decreases considerably, but a possibility of forming burrs and causing deformation of the beads increases.
  • the heat exchange tube 100 shown in FIG. 9 has inner fins 300 formed of a member different from that of the tube body portion 200 as flow passage dividers.
  • Other basic structure is same as in the previous described embodiment.
  • the inner fins 300 of this embodiment are a corrugated type and which are formed by roll forming an aluminum or aluminum alloy strip material.
  • the inner fin 300 has width t fin of 0.3 to 1.4 mm in an amplitude direction, the material of the inner fin has a thickness t 2 of 0.05 to 0.10 mm, and the tops of the inner fins have pitch P of 0.6 to 2.0 mm.
  • the inner fins 300 are inserted into the material of the tube body portion 200 in an appropriate stage of the roll forming process (process 1 ) and disposed within the tube body portion 200 .
  • One end 102 of the heat exchange tube 100 in its width direction is engaged so that separation does not occur after the inner fin 300 is inserted.
  • tops 301 of the inner fins 300 and ends 302 in a width direction are brazed to the inner surface of the tube body portion 200 .
  • a brazing material used for brazing the tops 301 of the inner fins 300 and the ends 302 in the width direction to the inner surface of the tube body portion 200 is clad to the material of the inner fins 300 .
  • a cutting process (process 2 ), the same cutter device 4 as that used in the first embodiment is used to form a slit as shown in FIG. 10 through FIG. 13 .
  • a relationship between slit depth d kerf , thickness t 1 of the material of the tube body portion 200 and thickness t 2 of the material of the inner fin 300 is: (1 ⁇ 2) ⁇ t 1 ⁇ d kerf ⁇ t 1 +t 2 , more preferably (3 ⁇ 4) ⁇ t 1 ⁇ d kerf ⁇ t 1 +(1 ⁇ 2) ⁇ t 2 , and most preferably d kerf ⁇ t 1 .
  • the heat exchange tube 100 of this embodiment was also designed pursuing a better performance on the basis of the existing production technology. Considering the facts that the inner fins 300 within the tube body portion 200 are deformed and displaced conspicuously in a case where the heat exchange tube 100 is cut before the tops 301 and the ends 302 in the width direction of the inner fins 300 are brazed, the inventors of the present invention has devised a structure in that a slit which becomes a starting point for cutting is formed in only the tube body portion 200 between the tube body portion 200 and the inner fins 300 or a slit, which becomes a starting point for cutting, is formed to range from the tube body portion 200 to the tops 301 of the inner fins 300 , and confirmed by experiments that the above structure is very effective.
  • the above equations generally show a relationship between good d kerf and t 1 obtained by the experiments. It is judged whether or not the slit is formed to reach the tops 301 of the inner fins 300 depending on a case considering a shape of the inner fins 300 and a stress or the like at the time of forming the slit. In other words, it should be noted that the forming the slit to reach the tops 301 of the inner fins 300 considerably decreases a force required for cutting but increases a possibility of formation of burrs, deformation and displacement.
  • the inner fins 300 are particularly thin and brittle in comparison with the tube body portion 200 , so that the fins can be separated together with the tube body portion 200 without forming a slit.
  • the inner fins 300 have a skin material formed of A4343 (Japanese Industrial Standard: JIS) clad as a brazing material clad to a core material formed of A3003 (JIS).
  • the strength of the core material can be improved by adding Cu to A3003.
  • a ratio of the skin material is desirably 5 to 10% of the whole.
  • the inner fins 300 are desirably cured by cold working. This inner fins 300 have a tensile strength of 120 to 200 N/mm 2 .
  • the slit depth d kerf is desirably a level such that a slight mark remains on the tops 301 of the inner fins 300 .
  • cutting of the roll formed tube having the flow passage dividers can be rationalized securely, and a better heat-exchange tube can be obtained.
  • inner fins 400 different from the corrugated type can also be used as the flow passage dividers.
  • the inner fins 400 have tube contact portions 401 , which are provided in a predetermined shape, and brazed to the inner surface of the tube body portion 200 .
  • the heat exchange tube 100 shown in FIG. 14 is also cut by forming a slit in only the tube body portion 200 between the tube body portion 200 and the inner fins 400 or by forming a slit ranging from the tube body portion 200 to the brazed tube contact portions 401 of the inner fins 400 and further a stress is concentrated on the slit, thereby to out the tube from the slit as a starting point.
  • a third embodiment of the invention will be described with reference to FIG. 15 .
  • a cutting process (process 2 ) of this embodiment it is structured such that the heat exchange tube 100 is pulled in a longitudinal direction by holding upstream and downstream sides of a slit formed portion in a conveying direction by a pair of clamps 4 c , 4 d and a space between the pair of clamps 4 c , 4 d is widened relatively.
  • the cutter device 4 of this embodiment has the pair of clamps 4 c , 4 d which are moved together with the cutters 4 a or the disk cutters 4 b in association with a conveying velocity of the heat exchange tube 100 , and the slit is formed in a state where the heat exchange tube 100 fixed by the individual clamps 4 c , 4 d.
  • the heat exchange tube 100 is pulled in the longitudinal direction with the space between the pair of clamps 4 c , 4 d increased with the heat exchange tube 100 being held by them.
  • a conveying velocity v 4 of the heat exchange tube 100 by the clamp 4 d on the downstream side in the conveying direction becomes faster than a conveying velocity v 3 of the heat exchange tube 100 by the clamp 4 c on the upstream side in the conveying direction.
  • the other basic structure is same as in the previously described embodiment.
  • a fourth embodiment of the invention will be described with reference to FIG. 16 .
  • a cutting process (process 2 ) of this embodiment is structured so that a stress is concentrated on a slit by applying a load in a direction different from a longitudinal direction of the heat exchange tube 100 in which the slit is formed by the cutter device 4 .
  • second feed rollers 5 a , 5 b , 5 c which are disposed offset to the longitudinal direction of the heat exchange tube 100 , and the heat exchange tube 100 passes through the predetermined second feed rollers 5 a , 5 b after the slit is formed by the cutter device 4 , and a load is applied in a direction different from the longitudinal direction of the heat exchange tube 100 .
  • the heat exchange tube 100 is separated while or after being passed through the prescribed second feed rollers 5 a , 5 b .
  • the other basic structure is same as in the previously described embodiment.
  • a cutting process (process 2 ) of this embodiment is structured so that a stress is concentrated on a slit by applying a load in a direction different from a longitudinal direction of the heat exchange tube 100 in which the slit is formed by the cutter device 4 .
  • the heat exchange tube 100 is oscillated so that a load is applied in a direction different from the longitudinal direction of the heat-exchange tube.
  • An oscillating device 8 for oscillating the heat exchange tube 100 is disposed in a subsequent stage of the cutter device 4 and the second feed rollers 5 , and the oscillating device 8 is structured to move the heat exchange tube 100 horizontally or vertically on the downstream side in the conveying direction while supporting the upstream side in the conveying direction of the portion, in which the slit is formed, by support means 8 a .
  • the other basic structure is same as in the previously described embodiment.
  • the heat-exchange tube can also be structured to be applied with a load by oscillating thereof.
  • the production method of a tube according to the invention can be used suitably as a method of producing the heat-exchange tube.
  • the heat-exchange tube is used to constitute a heat exchanger of a radiator and an evaporator of a refrigeration cycle, a radiator and a heater core of an automobile, and the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US10/583,087 2003-12-19 2004-12-15 Tube production method, heat-exchange tube produced by the method and heat exchanger using the heat-exchange tube Abandoned US20070144722A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2003-422257 2003-12-19
JP2003422257A JP2005177921A (ja) 2003-12-19 2003-12-19 チューブの製造方法、熱交換チューブ、及び熱交換器
PCT/JP2004/019161 WO2005058539A1 (ja) 2003-12-19 2004-12-15 チューブの製造方法、この方法により製造された熱交換チューブ及びこの熱交換チューブを用いた熱交換器

Publications (1)

Publication Number Publication Date
US20070144722A1 true US20070144722A1 (en) 2007-06-28

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US10/583,087 Abandoned US20070144722A1 (en) 2003-12-19 2004-12-15 Tube production method, heat-exchange tube produced by the method and heat exchanger using the heat-exchange tube

Country Status (4)

Country Link
US (1) US20070144722A1 (ja)
EP (1) EP1702710A4 (ja)
JP (1) JP2005177921A (ja)
WO (1) WO2005058539A1 (ja)

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US20090056927A1 (en) * 2006-01-19 2009-03-05 Werner Zobel Flat tube, flat tube heat exchanger, and method of manufacturing same
US20090120617A1 (en) * 2007-10-31 2009-05-14 Denoual Christophe Tube For Heat Exchanger
US20100024508A1 (en) * 2007-02-01 2010-02-04 Frank Opferkuch Tubes and method and apparatus for producing tubes
US20150107813A1 (en) * 2012-04-04 2015-04-23 Denso Corporation Tube and heat exchanger provided with tube
US20150360333A1 (en) * 2010-05-20 2015-12-17 Mahle International Gmbh Method of fabricating a tube for an evaporator
JP2016168653A (ja) * 2015-03-13 2016-09-23 株式会社 英田エンジニアリング チューブ切断装置
CN108954985A (zh) * 2018-08-06 2018-12-07 江苏秋实汽车空调有限公司 一种汽车空调冷凝器无芯集流管的生产工艺

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US8434227B2 (en) 2006-01-19 2013-05-07 Modine Manufacturing Company Method of forming heat exchanger tubes
DE102010023384B4 (de) * 2010-06-10 2014-08-28 Modine Manufacturing Co. Herstellungsverfahren, insbesondere für Rohre und Abreißvorrichtung
CN105525980A (zh) * 2014-09-30 2016-04-27 泰安鼎鑫冷却器有限公司 一种耐腐蚀高强度散热管
EP3108980A1 (en) * 2015-06-09 2016-12-28 Mahle International GmbH Method of fabricating a tube for an evaporator and device for fabricating a tube for an evaporator
EP3399267A1 (en) * 2017-05-02 2018-11-07 Valeo Systemes Thermiques A flat tube for a heat exchanger and a heat exchanger
CN111094886B (zh) * 2017-05-02 2022-10-18 法雷奥热系统公司 用于热交换器的扁平管和热交换器
JP7454733B2 (ja) 2022-07-19 2024-03-22 ダイキン工業株式会社 熱交換器

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US20090056927A1 (en) * 2006-01-19 2009-03-05 Werner Zobel Flat tube, flat tube heat exchanger, and method of manufacturing same
US20100243225A1 (en) * 2006-01-19 2010-09-30 Werner Zobel Flat tube, flat tube heat exchanger, and method of manufacturing same
US8726508B2 (en) 2006-01-19 2014-05-20 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US20100024508A1 (en) * 2007-02-01 2010-02-04 Frank Opferkuch Tubes and method and apparatus for producing tubes
US8561451B2 (en) 2007-02-01 2013-10-22 Modine Manufacturing Company Tubes and method and apparatus for producing tubes
US20090120617A1 (en) * 2007-10-31 2009-05-14 Denoual Christophe Tube For Heat Exchanger
US20150360333A1 (en) * 2010-05-20 2015-12-17 Mahle International Gmbh Method of fabricating a tube for an evaporator
US20150107813A1 (en) * 2012-04-04 2015-04-23 Denso Corporation Tube and heat exchanger provided with tube
US9726439B2 (en) * 2012-04-04 2017-08-08 Denso Corporation Tube and heat exchanger provided with tube
JP2016168653A (ja) * 2015-03-13 2016-09-23 株式会社 英田エンジニアリング チューブ切断装置
CN108954985A (zh) * 2018-08-06 2018-12-07 江苏秋实汽车空调有限公司 一种汽车空调冷凝器无芯集流管的生产工艺

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EP1702710A4 (en) 2008-03-19
EP1702710A1 (en) 2006-09-20
WO2005058539A1 (ja) 2005-06-30
JP2005177921A (ja) 2005-07-07

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