WO2008013507A1 - Matrice d'emboutissage segmentée à collier de liaison - Google Patents

Matrice d'emboutissage segmentée à collier de liaison Download PDF

Info

Publication number
WO2008013507A1
WO2008013507A1 PCT/SG2007/000219 SG2007000219W WO2008013507A1 WO 2008013507 A1 WO2008013507 A1 WO 2008013507A1 SG 2007000219 W SG2007000219 W SG 2007000219W WO 2008013507 A1 WO2008013507 A1 WO 2008013507A1
Authority
WO
WIPO (PCT)
Prior art keywords
collar
die assembly
die
assembly according
drawing member
Prior art date
Application number
PCT/SG2007/000219
Other languages
English (en)
Inventor
Nai Teck Lui
Original Assignee
Beyonics International Limited
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 Beyonics International Limited filed Critical Beyonics International Limited
Publication of WO2008013507A1 publication Critical patent/WO2008013507A1/fr

Links

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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/04—Stamping using rigid devices or tools for dimpling
    • 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/02—Die-cushions
    • 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
    • B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies

Definitions

  • the present invention relates to sheet metal drawing dies.
  • this invention relates to drawing die assemblies with each die being formed in segments in a binding collar to avoid die cracking.
  • Deep drawing of a sheet metal to form a hollow article of manufacture involves drawing the sheet metal into a drawing member (or female die) with a punch (or male die) with an aid of a press. Often, deep drawing is carried out in progressive steps through a series of progressive dies.
  • the clearance between the drawing member and punch is determined and fixed when each set of progressive die is designed.
  • the thickness tolerance of the sheet metal must, then, be controlled. If the thickness of the sheet metal is too thin, wrinkling may result; if the thickness of the sheet metal is too thick, the sheet metal may tear or the progressive die may crack before more serious problems occur to the press.
  • the deep drawn article may not satisfy the dimensional requirements specified for its function; if the thickness tolerance is marginally thicker than specified, the deep drawn article may satisfy the dimensional requirements but it may exhibit drawing streaks/scratches due to excessive drawing stresses; a deep drawn article thus manufactured may be rejected on the basis of the surface finish instead of the dimensional requirements.
  • the life of the die is invariably shortened.
  • the problems associated with deep drawing are exacerbated when the article of manufacture has a polygonal cross-section. For example, FIG. 1 shows a prior art drawing die 10 for forming a hexagonal hollow article.
  • the present invention provides a drawing die assembly.
  • the drawing die assembly comprises a drawing member having two or more segments; and a collar operable to bind the two or more segments together with a pre-tension force; wherein the pre-tension force allows the two or more die segments to expand when a drawing force exceeds the pre-tension force.
  • the pre-tension force is generated by shrink fitting the collar onto the drawing member by thermal expansion and contraction.
  • the pre-tension force is generated by narrowing a gap between cut ends of the collar.
  • the drawing member has a polygonal drawing edge and the two or more segments are segmented at two or more corners of the polygon. In another embodiment, the drawing member has a circular drawing edge.
  • the collar is polygonal. In another embodiment, the collar is substantially circular. Preferably, the collar is more elastic than the drawing member, and it may be hardened and tempered.
  • the present invention provides a method of forming a drawing die assembly with reduced frequency of die cracking.
  • the method comprises forming a drawing member in two or more segment; and binding the two or more segments of the drawing member in a collar with a pre-tension force.
  • FIG. 1 shows a prior art drawing die for drawing a hexagonal hollow article
  • FIG.2A illustrates a plan view of a die assembly in accordance with an embodiment of the present invention
  • FIG. 2B shows a sectional view B-B of the die assembly
  • FIG. 3 A shows a plan view of a die insert forming part of a drawing member shown in FIG. 2A
  • FIG. 3B shows a sectional view C-C of the die insert shown in FIG. 3A.
  • FIG. 4A shows a plan view of a collar shown in FIG. 2A; and FIG. 2B shows a sectional view D-D of the collar shown in FIG. 4A.
  • FIG. 5 illustrates another embodiment of the die assembly according to a second embodiment of the present invention
  • FIG. 6 illustrates another embodiment of the present invention according to a third embodiment of the present invention
  • FIG. 7 illustrates yet another embodiment of the present invention according to a fourth embodiment of the present invention
  • FIG. 2A shows a plan view of a die assembly 100 according to a first embodiment of the present invention.
  • FIG. 2B shows a section view B-B of the die assembly 100 mounted in a die holder 106 in addition to a punch 108.
  • the die assembly 100 is for deep drawing of a sheet metal 110 to form a hollow article 120 having a hexagonal shape.
  • the die assembly 100 is made up a drawing member 130 and a collar 140.
  • the drawing member 130 formed in the shape of a regular hexagonal ring 132, is made up of six inserts 134.
  • Each insert 134 forms a segment of the hexagonal ring 132 by a radial cut through each corner of the hexagon.
  • Each outside corner of the hexagonal ring 132 has a radius Rl.
  • FIG. 3B shows a cross section C-C of the insert 134.
  • a drawing radius R2 is formed on a drawing edge on an upper surface 136 of the drawing member 130.
  • FIG. 3 A the drawing member 130, formed in the shape of a regular hexagonal ring 132, is made up of six inserts 134.
  • Each insert 134 forms a segment of the hexagonal ring 132 by a radial cut through each corner of the hexagon.
  • Each outside corner of the hexagonal ring 132 has a radius Rl.
  • FIG. 3B shows a cross section C-C of the insert 134.
  • a drawing radius R2 is formed on a drawing edge on an upper
  • each insert 134 has an elongate projection 139 of rectangular cross-section substantially extending along a straight portion of an outer surface 138 of the hexagonal ring 132.
  • the projection 139 is continuous with a lower surface of the hexagonal ring 132.
  • each insert 134 has a thickness T.
  • Each insert 134 is formed from iron carbide, for example, with a tradename CD 337 supplied by Fine Carbide.
  • the surfaces of each insert 134 are profile ground to a roughness of about 5 micron so that six inserts 134 are placed together to form the hexagonal ring 132. After forming the hexagonal ring 132, the six inserts 134 are integrally ground in a gang. In addition, radius R2 is polished to a roughness of about 2 micron.
  • FIG. 4A shows a plan view of the collar 140
  • FIG. 4B shows a cross- section E-E of the collar 140
  • the collar 140 is in the form of a hexagonal ring 141.
  • the collar has an upper surface 142 and a lower surface 144.
  • a recess 148 which is contiguous with the lower surface 144.
  • On the upper surface 142 are formed partially circular steps 149 at four locations on the upper surface 142.
  • Each partially circular step 149 has a depth D.
  • the collar 140 is made of a softer and more elastic material than the drawing member 130.
  • collar 140 is made of tool steel, such as SW 42 supplied by Assab Steel, and is hardened and tempered to a Rockwell harness of Rc 50.
  • the dimensional tolerance of the inside surface 146 of the hexagonal ring 141 is controlled such that the hexagonal surface 146 and the drawing member's hexagonal surface 138 formed by the six inserts 134 are shrink fit.
  • the collar 140 is heated on a hot plate, for example, to a temperature of about 100 degree C so that the distance of a hexagonal surface 146 with an opposite hexagonal surface is expanded by about 100 micron. While the collar 140 is still hot, the top surface 142 of the collar is placed on a flat datum and six inserts 134 are inserted into the collar 140 with the projection 139 in the recess 148.
  • the hexagonal surface 146 contracts on the drawing member's hexagonal surface 138 to create a shrink fit between the inserts 134 and the collar 140.
  • This shrink fitting of the inserts 134 in the collar 140 creates a collar pre-tension force F to bind the inserts 134 snugly in the die assembly 100.
  • the die assembly 100 is slide fit into a die holder 106.
  • the die assembly 100 and the die holder 106 are secured together with screws 104 and associated die buttons 102 so that a head of each die button 102 engages a partially circular step 149 on the collar 140.
  • the die assembly 100 is, in turn, located on a platen of a press.
  • the punch 108 draws the sheet metal 110 into the hollow centre of the die assembly 100 and drawing member 130.
  • the sheet metal 110 is made to plastically flow over the drawing edge R2 of the drawing member 130.
  • the collar pre-tension force F provides the reaction force at the drawing edge R2 to form the article 120 into its shape with the required dimensional tolerances.
  • the projection 139 on each insert 134 of the drawing member 130 engages the recess 148 on the collar 140 to prevent the drawing member 130 from being drawn out with the article 120 and punch 108.
  • the sheet metal 110 is typically supplied in the form of coils.
  • the coiled sheet metal 110 has portions that are inherently inconsistent in its thickness tolerance.
  • the drawing edge R2 experience a drawing force larger than its designed force.
  • the collar pre-tension force F accommodates the higher drawing force by elastic expansion of the collar 140. This is only possible with the drawing member 130 formed by discrete inserts 134. If the drawing member 130 were formed from a solid piece, the corners of the hexagonal drawing surface would experience tremendous amount of stress; with repeated use, the stress concentrations result in the drawing member failing by fatigue.
  • the collar 140 is allowed to expand elastically during each deep drawing operation yet providing sufficient reaction force at the drawing edge R2 to form the article 120.
  • An advantage of the present invention is to extend the life to the die assembly 100.
  • Another advantage of the present invention is that the inserts 134 can be individually replaced. This leads to lower costs in replacing the inserts 134, instead of replacing the entire drawing member 130.
  • FIG. 5 shows another die assembly 200 according to a second embodiment of the present invention.
  • the die assembly 200 has a collar 240 with a circular outline.
  • the die assembly 200 has a drawing member 230 formed with three inserts 234. Each insert 234 takes the outline and dimensions of two adjacent inserts 134 described in the previous embodiment.
  • two parallel flat surfaces (as shown by the dotted line in FIG. 5) may be provided, for example, for orientation of the drawn article 120 with respect to the feeding direction of the sheet metal 110.
  • FIG. 6 shows another die assembly 300 according to a third embodiment of the present invention.
  • the die assembly has a collar 340 with a circular outline but the collar 340 is formed with two substantially semicircular segments 342a, 342b.
  • the ends of the two semicircular collar segments 342a, 342b before assembly are spaced apart by a radial gap S.
  • each end of the semicircular segment 342a is counter-bored to accommodate a screw 350, while a corresponding end of the collar segment 342b is threaded.
  • the screw 350 tightens each of the two ends of the substantially semicircular segments 342a, 342b together to create a collar pre-tension force F against inserts 334 forming a drawing member 330.
  • the collar 340 is made up of radial gap S and one screw 350.
  • the collar 340 is made up of three or more segments.
  • FIG. 7 shows yet another die assembly 400 according to a fourth embodiment of the present invention.
  • a collar 440 is formed in two substantially semicircular segments 440a, 440b just like that in the third embodiment but with an addition peripheral groove 444.
  • Inside the peripheral groove 444 is a screw and band assembly 448.
  • the screw and band assembly 448 has a screw 450 for opening and closing the semicircular segments 440a, 440b.
  • the collar 440 is made up of a single collar but with a cut end such that there is a gap between the cut ends of the collar.
  • the collar 440 is made up of a single collar with a cut end and additional one or more partially radial cuts, either on the inside or outside circumference.
  • the partially radial cuts are to increase the elasticity of the collar.
  • the partial cuts are non-radial.
  • the radial cuts are through the collar ring such that the collar is made up of three or more segments.
  • the present invention is not limited to deep drawing of a hexagon-shaped article.
  • the principle of the invention can be applied to forming a drawing die into segments and binding the segmented die components with an elastic collar, even for die drawing of a round or circular article.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Basic Packing Technique (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

La présente invention concerne un ensemble matrice d'emboutissage de tôle (100). L'ensemble matrice (100) comprend un élément d'emboutissage (130) présentant au moins deux segments de matrice (134) et un collier (140) permettant de lier les deux segments de matrice à l'aide d'une force de prétension F. Au cours d'une opération d'emboutissage, la force de prétension F constitue la force de réaction permettant de déformer plastiquement une tôle (110) au niveau d'une arête d'emboutissage R2 sur l'élément d'emboutissage (130). Dans le même temps, la force de prétension permet aux segments de matrice (134) de se dilater lorsqu'une force d'emboutissage dépasse la force de prétension, réduisant ainsi la fréquence de fissuration de la matrice.
PCT/SG2007/000219 2006-07-28 2007-07-24 Matrice d'emboutissage segmentée à collier de liaison WO2008013507A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG200605103-1A SG139589A1 (en) 2006-07-28 2006-07-28 A segmented drawing die with a binding collar
SG200605103-1 2006-07-28

Publications (1)

Publication Number Publication Date
WO2008013507A1 true WO2008013507A1 (fr) 2008-01-31

Family

ID=38981743

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG2007/000219 WO2008013507A1 (fr) 2006-07-28 2007-07-24 Matrice d'emboutissage segmentée à collier de liaison

Country Status (5)

Country Link
CN (1) CN101500724A (fr)
MY (1) MY142671A (fr)
SG (1) SG139589A1 (fr)
TW (1) TW200821060A (fr)
WO (1) WO2008013507A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106694706A (zh) * 2015-08-04 2017-05-24 亿森（上海）模具有限公司 一种深窄类制件的模具及其成型方法
CN106734633A (zh) * 2017-03-07 2017-05-31 石嘴山市金辉科贸有限公司 一种汽车零部件防开裂拉伸模

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2501613A1 (de) * 1975-01-16 1976-07-22 Michael W Freeman Segmentmatrizen
SU533431A1 (ru) * 1975-09-15 1976-10-30 Предприятие П/Я А-7354 Штамп
EP1234622A2 (fr) * 2001-02-21 2002-08-28 Bayerische Motoren Werke Aktiengesellschaft Procédé et dispositif de fabrication d'une ouverture à empreinte creuse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2501613A1 (de) * 1975-01-16 1976-07-22 Michael W Freeman Segmentmatrizen
SU533431A1 (ru) * 1975-09-15 1976-10-30 Предприятие П/Я А-7354 Штамп
EP1234622A2 (fr) * 2001-02-21 2002-08-28 Bayerische Motoren Werke Aktiengesellschaft Procédé et dispositif de fabrication d'une ouverture à empreinte creuse

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 197631, Derwent World Patents Index; AN 1976-G8194X *
DATABASE WPI Week 199724, Derwent World Patents Index; Class P52, AN 1977-E9830Y *
DATABASE WPI Week 200309, Derwent World Patents Index; Class P52, AN 2003-095042 *
DATABASE WPI Week 200355, Derwent World Patents Index; Class P51, AN 2003-586468 *

Also Published As

Publication number Publication date
SG139589A1 (en) 2008-02-29
MY142671A (en) 2010-12-15
CN101500724A (zh) 2009-08-05
TW200821060A (en) 2008-05-16

Similar Documents

Publication Publication Date Title
US20220226879A1 (en) Method and a Device for the Manufacturing of Washers for Locking and Washer for Locking
JP5236491B2 (ja) ナット、ナットの製作方法、およびこれに対応する工具
JP4949782B2 (ja) 精密打ち抜き型
KR101247667B1 (ko) 중공체 요소를 생산하기 위한 방법, 중공체 요소, 조립체 피스, 및 상기 방법을 수행하기 위한 연속식 복합 툴
JP4949783B2 (ja) 精密打ち抜き型
JP4473112B2 (ja) 切削工具とその部品及び切削工具の製造方法
EP2769792B1 (fr) Fraise de type à tête interchangeable, et support pour celle-ci
WO2005102559A2 (fr) Outil a lobes multiples en metal fritte et son procede de fabrication
CN104981306B (zh) 一种模架
WO2008013507A1 (fr) Matrice d'emboutissage segmentée à collier de liaison
EP3363571A1 (fr) Matériau pour bord de coupe rotatif et son procédé de production
JPH0523755A (ja) 金属板の打抜き加工方法および金型
KR101776615B1 (ko) 프레스 소성 가공을 이용한 베벨형 스냅링 제조 방법, 이 제조 방법에 사용되는 프레스 금형 및 이를 통해 제조된 베벨형 스냅링
JPH0581337B2 (fr)
CN108273919B (zh) 一种汽标螺丝模具的冲压模具及其加工方法
US6145418A (en) Laminated hand tool assembly
JP4940255B2 (ja) ヘリカル内歯ギヤの加工方法及び金型
US7766575B2 (en) Internally splined part
KR100455081B1 (ko) 자동차 오토트랜스미션용 솔레노이드밸브의 하우징 성형방법
JP2000094198A (ja) 冷間鍛造用金型
US6986301B2 (en) Punch for a ductile material joining tool
JPH07124634A (ja) 押出加工用ダイス
US20070113612A1 (en) Manufacturing method for a press work product
CN114008335B (zh) 垫圈紧固结构
CN100554711C (zh) 一种二类轴承实体组合保持架支柱的加工方法

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200780028056.6

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07794233

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: RU

122 Ep: pct application non-entry in european phase

Ref document number: 07794233

Country of ref document: EP

Kind code of ref document: A1