EP0769337B1 - A method of closing an end of a metal pipe - Google Patents

A method of closing an end of a metal pipe Download PDF

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Publication number
EP0769337B1
EP0769337B1 EP96116206A EP96116206A EP0769337B1 EP 0769337 B1 EP0769337 B1 EP 0769337B1 EP 96116206 A EP96116206 A EP 96116206A EP 96116206 A EP96116206 A EP 96116206A EP 0769337 B1 EP0769337 B1 EP 0769337B1
Authority
EP
European Patent Office
Prior art keywords
pipe
axis
support
projects
closed
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP96116206A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0769337A1 (en
Inventor
Dante Iarossi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Thermal Systems SpA
Original Assignee
Denso Thermal Systems SpA
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
Application filed by Denso Thermal Systems SpA filed Critical Denso Thermal Systems SpA
Publication of EP0769337A1 publication Critical patent/EP0769337A1/en
Application granted granted Critical
Publication of EP0769337B1 publication Critical patent/EP0769337B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0243—Header boxes having a circular cross-section
    • 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
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/04—Reducing; Closing
    • B21D41/045—Closing
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
    • F28D2021/0084—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2220/00—Closure means, e.g. end caps on header boxes or plugs on conduits

Definitions

  • the present invention relates to a method of closing an end of a metal pipe in a fluid-tight manner of the kind defined in the preamble of Claim 1.
  • the method according to the invention is used, in particular, in the field of the production of heat exchangers for vehicles and, more precisely, for the manufacture of a condenser distributor which is generally made from an extruded or drawn pipe of which one or both ends have to be closed in a fluid-tight manner, possibly after the insertion partitions for distributing the flow.
  • a condenser distributor which is generally made from an extruded or drawn pipe of which one or both ends have to be closed in a fluid-tight manner, possibly after the insertion partitions for distributing the flow.
  • the present invention is not limited to this specific field and may be used wherever it is necessary to form a fluid-tight closure at an end of a metal pipe.
  • a method of the afore-mentioned kind for closing an end of a metal pipe is disclosed in US-A-5 085 131, with reference to figures 8-11 thereof.
  • the forming tool used to close a pipe end is a stationary arbor, which has a contact surface having an almost stepped profile, i.e. a contact surface having a radius of curvature which is by far smaller than the axial length of the portion of the pipe which protrudes from the pipe tightening support.
  • the object of the invention is to provide an improved method for the closure of pipe ends without the application of heat thereto.
  • a metal pipe indicated 10
  • the tools required to close the end 12 comprise a tubular support 14 in which the pipe 10 is positioned.
  • the support 14 is constituted, for example, by a resilient bush for insertion in a chuck 16 rotatable about an axis 18 coinciding with the longitudinal axis of the pipe 10.
  • the support 14 has the main purpose of preventing damage to the external surface of the pipe 10 when it is gripped by the chuck 16.
  • the support 14 has a flat surface 20 from which a portion A of the pipe 10 projects.
  • the dimension A must be determined with care. In fact, if the dimension A is too small in comparison with the diameter D of the pipe 10 it is not possible to close the end whereas, if the dimension A is too large, excessive back-flow and deformation of the material are produced.
  • A K + b D, in which :
  • the rate of rotation of the pipe 10 about its axis during the operation to close the end 12 may vary from 600 to 1000 revolutions/minute.
  • a normal value of the rate of rotation of the chuck 16 which achieves good results is about 800 revolutions/minute.
  • the tools for closing the end of the pipe 10 also comprise a wheel 22 fixed idly to a tool-holder 24.
  • the wheel 22 can rotate freely about an axis 26 parallel or substantially parallel to the axis 18 of the pipe 10.
  • the tool-holder 24 can move along a straight line perpendicular to the axis 18 of the pipe 10 and indicated by the arrow 28 in Figure 1.
  • the wheel 22 has a flat surface 30 which is substantially aligned with the flat surface 20 of the support 14.
  • the distance between the surfaces 30 and 20 in a direction parallel to the axis 18 must be close to zero.
  • the surface of the wheel 22 which is intended to contact the wall of the pipe 10 has a curvature 32 having a radius R which is equal to or greater than the dimension A by which the end to be closed projects.
  • the idle wheel 22 represents the most appropriate tool for implementing the method according to the invention. However, a method could also be implemented with tools of different kinds not comprised in the invention. For example, a non-rotatable metal body having a profile similar to that of the cross-section of the wheel 22 could be used instead of the wheel 22.
  • the idle wheel 22 has the advantage of reducing the contact friction and the heat which are generated during the deformation step of the pipe 10 and achieves a better result from the aesthetic point of view.
  • the method according to the invention is implemented simply by the rotation of the pipe 10 and the movement of the tool-holder 24 towards the axis of 18 of the pipe 10 in the direction of the arrow 28.
  • the forward movement of the tool-holder 24 is stopped when the junction between the arcuate surface 32 and the flat surface 30 is a little beyond the axis 18.
  • Figure 2 shows the configuration of the tools and of the pipe 10 upon completion of the forward stroke of the tool-holder 24.
  • the projecting portion of the pipe 10 has been completely flattened and turned over inwardly.
  • the upsetting of the material and the heat of friction generated during the process bring about plastic deformation of the material which completely seals the end.
  • the wheel 22 applies to the wall of the pipe 10 an inward deformation force the point of application of which varies continuously both circumferentially, as a result of the rotation of the pipe 10, and radially, as a result of the advance of the tool-holder 24.
  • the effect of the inward deformation is to reduce the width of the hole progressively until it is completely closed.
  • the closure produced requires no re-welding operations since it seals itself as a result of the heat of friction produced.
  • the closure is particularly resistant to high working pressures.
  • the method of the invention can easily be automated and, in comparison with a conventional welding method, is very easy to implement and has a minimal cost.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Forging (AREA)
  • Heat Treatment Of Articles (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Pipe Accessories (AREA)
EP96116206A 1995-10-18 1996-10-10 A method of closing an end of a metal pipe Expired - Lifetime EP0769337B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO950841 1995-10-18
IT95TO000841A IT1280983B1 (it) 1995-10-18 1995-10-18 Procedimento per chiudere un'estremita' di un tubo metallico.

Publications (2)

Publication Number Publication Date
EP0769337A1 EP0769337A1 (en) 1997-04-23
EP0769337B1 true EP0769337B1 (en) 2002-04-17

Family

ID=11413896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96116206A Expired - Lifetime EP0769337B1 (en) 1995-10-18 1996-10-10 A method of closing an end of a metal pipe

Country Status (5)

Country Link
EP (1) EP0769337B1 (oth)
JP (1) JP3819085B2 (oth)
DE (1) DE69620703T2 (oth)
ES (1) ES2171587T3 (oth)
IT (1) IT1280983B1 (oth)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002267390A (ja) * 2001-03-09 2002-09-18 Sanden Corp 熱交換器
ITMI20031239A1 (it) 2003-06-19 2004-12-20 S P I C E Group S R L Metodo ed apparecchiatura per chiudere ermeticamente un tubo conducente gas o liquidi
FR2859654B1 (fr) * 2003-09-11 2006-12-08 Ems Societe Procede d'obturation de l'extremite d'un tube metallique sans chauffage prealable et moyens destines a le mettre en oeuvre
ES2304269B1 (es) 2005-08-03 2009-07-17 Alberto Bellomo Distribuidor de gas para una cocina, con un cierre del tubo.
CN102489617A (zh) * 2011-12-02 2012-06-13 王平安 金属管封口工艺
CN103480874B (zh) * 2013-09-29 2015-10-28 浙江施克汽车配件有限公司 铝罐封口刀具
CN103624175B (zh) * 2013-11-28 2016-08-24 北京佛罗伦萨散热器有限公司 散热器支管封头机
FR3034825B1 (fr) * 2015-04-10 2017-03-31 Clufix Insert taraude
CN106975705A (zh) * 2017-05-22 2017-07-25 礼泉鑫灞厨具有限公司 一种自动收口机
CN108544189B (zh) * 2018-04-16 2020-10-02 中国兵器工业第五九研究所 一种小尺寸中空薄壁壳体件的塑性成形方法
CN115608864A (zh) * 2021-07-16 2023-01-17 三花控股集团有限公司 管件加工部件及管件加工设备
CN115608865A (zh) * 2021-07-16 2023-01-17 三花控股集团有限公司 管件加工方法、管件加工部件及管件
CN116251880A (zh) * 2021-12-02 2023-06-13 三花控股集团有限公司 管件加工部件及管件加工设备
CN117620608A (zh) * 2023-12-05 2024-03-01 江苏欧朗汽车科技股份有限公司 一种新型不锈钢管成型封口设计及封口工艺
CN119734092A (zh) * 2025-03-05 2025-04-01 广州市万伟金属制品有限公司 紫铜管自动换位连续缩管装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2408596A (en) * 1944-03-13 1946-10-01 Nat Tube Co Method of forming cylinder ends
US3264729A (en) * 1962-06-18 1966-08-09 Gas Appliance Supply Corp Method for closing the ends of pipes
DE3321363A1 (de) * 1983-06-14 1984-12-20 Th. Kieserling & Albrecht Gmbh & Co, 5650 Solingen Drueckverfahren und schwenkform-drueckmaschine zur durchfuehrung des verfahrens
US5085131A (en) * 1990-10-02 1992-02-04 Prime Tube, Inc. Hydraulic cylinder for automotive steering systems and the like

Also Published As

Publication number Publication date
IT1280983B1 (it) 1998-02-11
DE69620703D1 (de) 2002-05-23
ITTO950841A0 (oth) 1995-10-18
ES2171587T3 (es) 2002-09-16
DE69620703T2 (de) 2002-10-17
ITTO950841A1 (it) 1997-04-18
JPH09196278A (ja) 1997-07-29
JP3819085B2 (ja) 2006-09-06
EP0769337A1 (en) 1997-04-23

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