US3553994A - Method of cold-forging a tubular body - Google Patents

Method of cold-forging a tubular body Download PDF

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Publication number
US3553994A
US3553994A US722089A US3553994DA US3553994A US 3553994 A US3553994 A US 3553994A US 722089 A US722089 A US 722089A US 3553994D A US3553994D A US 3553994DA US 3553994 A US3553994 A US 3553994A
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US
United States
Prior art keywords
billet
punch
forging
mold
diameter
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
US722089A
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English (en)
Inventor
Eskil Monestam
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US3553994A publication Critical patent/US3553994A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B21K21/06—Shaping thick-walled hollow articles, e.g. projectiles
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/20—Making uncoated products by backward extrusion

Definitions

  • a billet of at least twice as great a diameter as its thickness is inserted into a mold having a bottom of Aconical or spherical shape and is pressed downward by a punch having -a body end substantially corresponding in shape to the bottom of the mold and having a smaller diameter than the diameter of the surrounding mold.
  • the top of the billet is provided with a lubricant.
  • On pushing down the punch Ithe center part of the billet is rst bent downwardly after which the material is extruded upwardly into the space between the punch and the mold.
  • the present invention relates to a method of coldforging a tubular body with the help of a punch which is inserted into a mould surrounded by a pressure cylinder With a radial gap corresponding to the desired wall-thickness of the body, wherein the bottom of the mould consists of a die having a central conical and/or spherical depression, and the active end of the punch is insertable into said depression and susstantially shaped with corresponding conical and/or spherical surfaces.
  • the depth which can be achieved is considerably increased if the billet is iirst drawn :to a bowl shape, after which the preshaped billet is extruded to the desired nal shape, which can with advantage be carried out in one and the same operation. No great increase or dissipation of the layer of lubricant occurs during drawing so that this is intact ice to be the case when manufacturing certain grenade shells.
  • a method according to the invention is characterised in that a disc-Shaped billet, the thickness of which is greater than said gap and at the most half the diameter of the billet, is provided with a lubricating layer intended for cold-forging and arranged to rest against the upper part of the die along a a narrow, annular supporting surface, after which the punch is pressed against the upper surface of the billet to initiate a drawing process to shape the billet in conformity with the end of the punch, during which drawing process the contact surface of the punch on the billet has at all times a diameter which is less than half the inner diameter of said supporting surface, the lower side of the billet being formed with convexity and the upper side wit-h substantially corresponding concavity, said supporting surface remaining substantially unaltered, after which the punch continues its downwards movement so that the billet material is extruded in a manner known per se into the space between the mould and the punch.
  • FIGS. 1, 2, 3 and 4 show different stages in a manufacturing process according to the invention.
  • FIG. 1 designates a punch which is mechanically connected to the pressure piston 2 of a press stand and coaxially arranged in relation to a mould 3 which is surrounded by a pressure cylinder 4 which has been put together from several parts.
  • the bottom of the mould consists of a die 5 which has a bowl-shaped depression 6 limited by a conical surface 7 and a spherical surface 8.
  • the active end of the punch 1 is intended to be inserted into the depression 6 and is shaped with a conical surface substantially corresponding to that of the surface 7, and a spherical surface the radius of curvature of which has approximately the same value as that of the surface 8.
  • the die 5 is attached to an expelling punch 9 by means of the screw 10.
  • the lpressure surface is designated 11 and a pressure-distributing plate arranged on this is designated 12.
  • the forging billet 13 comprises a circular disc the diameter of which corresponds to the inner diameter in the upper part of the mould.
  • the thickness is several times greater than the intended wall-thickness of the iinished tubular body but sufficiently small to allow tensile forces to cause a predominant part of the plas-tic deformation taking place when the punch 1 is pressed downwards as shown in FIGS. 1 and 2. This is obtained with certainty when 4the thickness of the billet is at the most equal to half its diameter and, at the same time, the internal diameter of its supporting surface is at least twice as great as the cross-measurement of the contact surface between the billet and the punch.
  • the lubricating layer applied on the upper side of the billet is still intact at the corresponding stages. In FIG. 3 the drawing is almost completed and extrusion has commenced.
  • .14 designates the linished tubular body.
  • Method of cold-forging a cup-like tubular body by backward extrusion comprising the s-teps of inserting a punch into a mold surrounded by a pressure cylinder with a radial gap between the cylindrical outside of the punch and the interior of the mold corresponding to the desired wall-thickness of the body, wherein the lowest part of the mold is closed by a ⁇ tight bottom which comprises a die having a central depression the surface of which is a surface of revolution, and the active end of the punch is insertable into said depression and is substantially shaped with a corresponding surface, providing a disc-shaped billet, the thickness of which is substantially greater than the thickness of the bottom of said cuplike body, greater than said gap and at the most half the diameter of the billet, providing a lubricating layer intended for cold-forging and arranging the billet to rest against the upper part of the die along a narrow, annular supporting surface, pressing the punch against the upper surface of the billet to -initiate a drawing process to shape the billet in conformity

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
US722089A 1967-04-20 1968-04-17 Method of cold-forging a tubular body Expired - Lifetime US3553994A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE05516/67A SE351377B (https=) 1967-04-20 1967-04-20

Publications (1)

Publication Number Publication Date
US3553994A true US3553994A (en) 1971-01-12

Family

ID=20266652

Family Applications (1)

Application Number Title Priority Date Filing Date
US722089A Expired - Lifetime US3553994A (en) 1967-04-20 1968-04-17 Method of cold-forging a tubular body

Country Status (5)

Country Link
US (1) US3553994A (https=)
DE (1) DE1752175A1 (https=)
FR (1) FR1561669A (https=)
GB (1) GB1215074A (https=)
SE (1) SE351377B (https=)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4856824A (en) * 1986-02-27 1989-08-15 Norsk Hydro A.S. Method of manufacture of manifolds and manifold provided by such method
ES2426319R1 (es) * 2012-04-19 2013-12-23 Expal Systems S A Proceso y sistema de conformado de una lamina metalica
CN103551439A (zh) * 2013-11-12 2014-02-05 张有龙 包装容器法兰无污染冷挤压成型方法及冷挤压模具
CN104084446A (zh) * 2014-06-26 2014-10-08 梧州恒声电子科技有限公司 一种具有反挤压和拉伸工序的拉管类产品的生产工艺

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2252836C1 (ru) * 2003-09-22 2005-05-27 Закрытое акционерное общество "Орион Гринёва" Способ изготовления полых изделий
RU2254202C1 (ru) * 2003-12-31 2005-06-20 Государственное образовательное учреждение высшего профессионального образования Нижегородский государственый технический университет (НГТУ) Способ выдавливания полых деталей
RU2356678C1 (ru) * 2007-09-21 2009-05-27 Государственное образовательное учреждение высшего профессионального образования Тульский государственный университет (ТулГУ) Штамп для выдавливания тонкостенных оболочек

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4856824A (en) * 1986-02-27 1989-08-15 Norsk Hydro A.S. Method of manufacture of manifolds and manifold provided by such method
ES2426319R1 (es) * 2012-04-19 2013-12-23 Expal Systems S A Proceso y sistema de conformado de una lamina metalica
US9908164B2 (en) 2012-04-19 2018-03-06 Expal Systems S.A. Sheet metal forming process and system
CN103551439A (zh) * 2013-11-12 2014-02-05 张有龙 包装容器法兰无污染冷挤压成型方法及冷挤压模具
CN104084446A (zh) * 2014-06-26 2014-10-08 梧州恒声电子科技有限公司 一种具有反挤压和拉伸工序的拉管类产品的生产工艺
CN104084446B (zh) * 2014-06-26 2016-03-02 梧州恒声电子科技有限公司 一种具有反挤压和拉伸工序的拉管类产品的生产工艺

Also Published As

Publication number Publication date
SE351377B (https=) 1972-11-27
DE1752175A1 (de) 1971-04-08
FR1561669A (https=) 1969-03-28
GB1215074A (en) 1970-12-09

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