EP0188086A2 - Fabrication d'éléments tubulaires - Google Patents

Fabrication d'éléments tubulaires Download PDF

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Publication number
EP0188086A2
EP0188086A2 EP85308921A EP85308921A EP0188086A2 EP 0188086 A2 EP0188086 A2 EP 0188086A2 EP 85308921 A EP85308921 A EP 85308921A EP 85308921 A EP85308921 A EP 85308921A EP 0188086 A2 EP0188086 A2 EP 0188086A2
Authority
EP
European Patent Office
Prior art keywords
mandrel
die
push
pointing
tube
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.)
Withdrawn
Application number
EP85308921A
Other languages
German (de)
English (en)
Other versions
EP0188086A3 (fr
Inventor
Alfred James Thompson
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.)
Stevens and Bullivant Ltd
Original Assignee
Stevens and Bullivant Ltd
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 Stevens and Bullivant Ltd filed Critical Stevens and Bullivant Ltd
Publication of EP0188086A2 publication Critical patent/EP0188086A2/fr
Publication of EP0188086A3 publication Critical patent/EP0188086A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C5/00—Pointing; Push-pointing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C5/00—Pointing; Push-pointing
    • B21C5/003—Pointing; Push-pointing of hollow material, e.g. tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/12—Shaping end portions of hollow articles

Definitions

  • This invention relates to the manufacture of tubular components by an axial swageing or reduction/extrusion process involving forcing an extrusion die over an end portion of a tube, or "push-pointing" as such process is usually called.
  • the die has a conical entry portion of larger diameter than the untreated tube and a smallest diameter portion corresponding to the required diameter of the finished tube.
  • the tube needs to be clamped, or alternatively, particularly where a component requires both ends to be similarly formed, both ends can be treated at the same time thus reducing or even obviating the need for clamping of the tube.
  • the object of the present invention is to provide an improved method and apparatus for carrying such operations where the reduced diameter portion has a finite length (as distinct from the situation where it is merely a frusto-conical or like shaping at each end).
  • the invention offers particular advantages where the tube has a welded seam, as distinct from a seamless drawn tube, although the invention is also applicable (with less advantage) in the seamless tube situation.
  • a method of making a stepped diameter tubular component comprises firstly introducing a headed mandrel into the interior of the untreated tube, secondly push-pointing the end of the tube to form a portion of reduced diameter, and then withdrawing the mandrel through the reduced diameter portion to size the interior.
  • both the interior and the exterior of the stepped portion can be drawn to finished size, and any, for example, weld bead on the inside of the reduced diameter portion can be cleaned off and removed.
  • the push-pointing die has a parallel portion of finite length, and the sizing of the internal diameter of the component is effected whilst the mandrel is within that portion. It is conventional to provide a push-pointing die with a wide angle mouth of frusto-conical formation having a large end which is of greater diameter than the untreated component so as to receive that end and guide it into the working portion of the tapered throat so afforded; followed by a relatively short axial length which is of uniform diameter, and then a relatively narrow angle frusto - conical portion behind that, so as to reduce frictional drag on the reduced diameter portion if a substantial length of the same - greater than the length of the uniform diameter portion of the die - is formed.
  • the parallel portion is either to be made of greater length than usual, or alternative equivalent means may be used as explained below.
  • the alternative means comprise arrangements for axially displacing the push-pointing die and the mandrel substantially synchronously whilst the mandrel head is located within the uniform diameter portion of the die.
  • a component has both ends formed successively or simultaneously by like means.
  • the apparatus comprises a clamp 10 to hold a tube 12 in position for treatment. If one end only of the tube is to be treated a fixed abutment may lie at the other end of the tube and the clamp is only a steady.
  • the illustrations assume that both ends of a tube are to be treated, although not necessarily simultaneously, as hereinafter discussed.
  • the apparatus shown is adapted for treatment at both ends by the provision of duplicated sets of displacement rams 14 and dies 16.
  • each die comprises a major frusto-conical portion 18 with its larger end adjacent to the tube, a parallel portion 20 opening from the small end of the portion 18, and a tapered portion 22 which increases in diameter from the parallel portion to the opposite end of the die.
  • the die is mounted on a ram 24 of hydraulic cylinder 26.
  • the die structure further includes mandrel 28 which may be somewhat barrel-shaped as shown preferably but not essentially having a uniform diameter portion of finite length generally mid-way along its axial length, the uniform diameter being the maximum diameter of the mandrel.
  • the mandrel is mounted on a second ram 30 powered by a hydraulic cylinder 32.
  • Ram 30 extends through ram 24.
  • the two rams 24, 28 can be coupled by a lock 34.
  • Appropriate hydraulic fluid flow control valves are provided to enable the rams to be displaced in either direction.
  • ram 30 is first extended to the maximum travel so as to locate mandrel 28 in the tube 12 and beyond the zone to be treated.
  • Ram 24 is then, or simultaneously, extended so as to force the die onto the tube and push-point the end of the tube into a frusto-conical shape 40 as shown in Figure 3.
  • Ram 24 continues to extend to displace the whole die structure along the tube so as to produce a reduced diameter tube portion 44 ( Figure 4) and effectively move the frusto-conical portion 40 along the tube length.
  • This extension of ram 24 to the desired extent may accompany or follow the extension of ram 30:
  • Figures 3 and 4 show the ram 30 movement as being completed before ram 24 movement is completed.
  • the push-pointing rams 24 are displaced towards one another alternately: this reduces the maximum power required.
  • the power requirement for the . sizing operation is usually less, dependent to some extent upon the nature of the tube and the permissible tolerances so that usually both sets of locked rams can be withdrawn together to size both ends simultaneously: but again alternate operation is possible if required.
  • the drawings illustrate a die with a parallel portion substantially equal in length to the uniform diameter portion mandrel to suit the simultaneous withdrawal technique described.
  • one or other of the mandrel or die may have a uniform portion of infinite length. That is to say the mandrel may be wholly barrel-shaped or the two tapered portions in the die may meet without a parallel diameter portion.
  • the parallel diameter portion may be longer than illustrated in which event it may be possible for there to be relative movement between die and mandrel during the external/internal sizing operation.
  • the simultaneous movement of the two over the tube is preferred to obtain maximum quality of finished tube sized both internally ana externally.
  • the dies and rams are arranged on a table 50 with ram cylinders 52 (for the ram 30) and 54 (for the ram 24) mounted on brackets 56 running on slideways to facilitate adjustment to set up for particular dimensions.
  • the workpiece mount or clamp 20 is here shown as comprising a pair of aligned hydraulic cylinders 58 having their axes transverse to those of the push-pointed dies and sizing mandrel. Cylinders 58 are likewise mounted on slideways to enable adjustment to suit the workpiece.
  • the machine structure includes a hydraulic reservoir 60, a pump and motor set 62, and the associated fluid control valves 64.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Forging (AREA)
EP85308921A 1985-01-12 1985-12-09 Fabrication d'éléments tubulaires Withdrawn EP0188086A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8500785 1985-01-12
GB858500785A GB8500785D0 (en) 1985-01-12 1985-01-12 Tubular

Publications (2)

Publication Number Publication Date
EP0188086A2 true EP0188086A2 (fr) 1986-07-23
EP0188086A3 EP0188086A3 (fr) 1987-04-08

Family

ID=10572761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85308921A Withdrawn EP0188086A3 (fr) 1985-01-12 1985-12-09 Fabrication d'éléments tubulaires

Country Status (3)

Country Link
EP (1) EP0188086A3 (fr)
GB (1) GB8500785D0 (fr)
IN (1) IN165807B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994022634A1 (fr) * 1993-04-06 1994-10-13 Alberto Navarra Pruna Procede de fabrication d'un element tubulaire d'expulsion pour moules
WO2004026502A1 (fr) * 2002-09-19 2004-04-01 Blissfield Manufacturing Company Procede de formage d'extremite d'un tube possedant des caracteristiques interieures de surface
WO2008028059A1 (fr) * 2006-08-30 2008-03-06 Alcoa Inc. Procédés et systèmes pour réduire les contraintes résiduelles de tension dans une tubulure compressée et produits de tubulure métallique fabriqués ainsi
ITMI20092155A1 (it) * 2009-12-04 2011-06-05 Giuseppe Cignani Processo per la produzione di un estrattore a cannocchiale ed estrattore ottenuto con detto processo
CN102500711A (zh) * 2011-10-13 2012-06-20 四川宁江山川机械有限责任公司 减震器贮油缸收口工艺及设备
CN105500012A (zh) * 2016-01-28 2016-04-20 宁波锦伟紧固件集团有限公司 一种攻丝缩管加工装置
EP2161083A3 (fr) * 2008-09-09 2017-03-22 Tae-Seung Yoo Procédé de fabrication de conteneur pour absorber le choc de fluides ou un choc mécanique
DE102016124995A1 (de) 2016-12-20 2018-06-21 Benteler Steel/Tube Gmbh Verfahren und Vorrichtung zur Herstellung einer Rohrkomponente für einen Gasgenerator und Gasgenerator-Rohrkomponente
CN114413531A (zh) * 2022-01-11 2022-04-29 河南新科隆电器有限公司 一种冰箱/冷柜用新型储液罐及其加工方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2473916A1 (fr) * 1980-01-22 1981-07-24 Tubes Cie Indle Cale Procede de faconnage a froid d'un arbre tubulaire dont les extremites ont un diametre interieur calibre inferieur a celui de sa partie centrale
DE3004132C2 (de) * 1980-02-01 1985-06-20 Mannesmann AG, 4000 Düsseldorf Verfahren zum Herstellen von einteiligen Kraftfahrzeughohlachsen
FR2534159B1 (fr) * 1982-10-08 1986-05-16 Piercy Jean Procede de fabrication de pieces cylindriques, notamment de pieces creuses, et machine pour sa mise en oeuvre

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5546647A (en) * 1993-04-06 1996-08-20 Pruna; Alberto N. Method of making an ejector tube for molds
ES2093545A1 (es) * 1993-04-06 1996-12-16 Pruna Alberto Navarra Procedimiento de fabricacion de un tubular de expulsion para moldes.
WO1994022634A1 (fr) * 1993-04-06 1994-10-13 Alberto Navarra Pruna Procede de fabrication d'un element tubulaire d'expulsion pour moules
WO2004026502A1 (fr) * 2002-09-19 2004-04-01 Blissfield Manufacturing Company Procede de formage d'extremite d'un tube possedant des caracteristiques interieures de surface
US7062948B2 (en) 2002-09-19 2006-06-20 Blissfield Manufacturing Company Process of end-forming a tube having internal surface features
WO2008028059A1 (fr) * 2006-08-30 2008-03-06 Alcoa Inc. Procédés et systèmes pour réduire les contraintes résiduelles de tension dans une tubulure compressée et produits de tubulure métallique fabriqués ainsi
US7895875B2 (en) 2006-08-30 2011-03-01 Alcoa Inc. Methods and systems for reducing tensile residual stresses in compressed tubing and metal tubing products produced from same
EP2161083A3 (fr) * 2008-09-09 2017-03-22 Tae-Seung Yoo Procédé de fabrication de conteneur pour absorber le choc de fluides ou un choc mécanique
ITMI20092155A1 (it) * 2009-12-04 2011-06-05 Giuseppe Cignani Processo per la produzione di un estrattore a cannocchiale ed estrattore ottenuto con detto processo
CN102500711A (zh) * 2011-10-13 2012-06-20 四川宁江山川机械有限责任公司 减震器贮油缸收口工艺及设备
CN105500012A (zh) * 2016-01-28 2016-04-20 宁波锦伟紧固件集团有限公司 一种攻丝缩管加工装置
DE102016124995A1 (de) 2016-12-20 2018-06-21 Benteler Steel/Tube Gmbh Verfahren und Vorrichtung zur Herstellung einer Rohrkomponente für einen Gasgenerator und Gasgenerator-Rohrkomponente
DE102016124995B4 (de) 2016-12-20 2021-07-29 Benteler Steel/Tube Gmbh Verfahren und Vorrichtung zur Herstellung einer Rohrkomponente für einen Gasgenerator und Gasgenerator-Rohrkomponente
US11235372B2 (en) 2016-12-20 2022-02-01 Benteler Steel/Tube Gmbh Method and apparatus for the production of a tubular structure for a gas generator, and gas generator tubular structure
CN114413531A (zh) * 2022-01-11 2022-04-29 河南新科隆电器有限公司 一种冰箱/冷柜用新型储液罐及其加工方法
CN114413531B (zh) * 2022-01-11 2024-03-01 河南新科隆电器有限公司 一种冰箱/冷柜用新型储液罐及其加工方法

Also Published As

Publication number Publication date
GB8500785D0 (en) 1985-02-13
EP0188086A3 (fr) 1987-04-08
IN165807B (fr) 1990-01-13

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Inventor name: THOMPSON, ALFRED JAMES