EP0102429A1 - Verbundwerkzeug - Google Patents

Verbundwerkzeug Download PDF

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Publication number
EP0102429A1
EP0102429A1 EP82304671A EP82304671A EP0102429A1 EP 0102429 A1 EP0102429 A1 EP 0102429A1 EP 82304671 A EP82304671 A EP 82304671A EP 82304671 A EP82304671 A EP 82304671A EP 0102429 A1 EP0102429 A1 EP 0102429A1
Authority
EP
European Patent Office
Prior art keywords
die
punch
holder
holes
plate
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.)
Granted
Application number
EP82304671A
Other languages
English (en)
French (fr)
Other versions
EP0102429B1 (de
Inventor
Satoshi Iwata
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.)
IWATA TETSUTARO
Original Assignee
IWATA TETSUTARO
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 IWATA TETSUTARO filed Critical IWATA TETSUTARO
Priority to EP19820304671 priority Critical patent/EP0102429B1/de
Priority to DE8282304671T priority patent/DE3274957D1/de
Publication of EP0102429A1 publication Critical patent/EP0102429A1/de
Application granted granted Critical
Publication of EP0102429B1 publication Critical patent/EP0102429B1/de
Expired 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/14—Dies

Definitions

  • This invention relates to dies for shearing in stamping, and more particularly, to compound die assemblies for performing blanking and piercing at a same press stroke.
  • the compound die assembly is used for making large-sized parts, weight and size of the die are necessarily increased and therefore, cost is also increased. Furthermore, the die assembly is suffered from difficulty and danger in installation on a press. In particular, it is accompanied with danger to fix a punch unit to the press ram, and there is required skill in die-height adjustment.
  • a die holder of the compound die assembly is provided with slug clearance holes in order to remove punched slugs, and the compound die assembly is mounted on the press so that the slug clearance holes are disposed over openings of a bolster and a bed of the press.
  • punched slugs corresponding to holes at peripheral portion of the blank do not drop into the bolster opening so that the slugs cannot be removed.
  • parallel blocks beneath the die holder to form a space between the die holder and the press bolster in which punched slugs are accumulated.
  • the central portion of the die holder is maintained unsupported.
  • a compound die assembly is one which comprises a punch unit including a punch holder, at least one punch element, a blanking die element, and a knockout plate; a die unit including a die holder, a blanking punch element corresponding to the blanking die element and having a die hole corresponding to the at least one punch element, and a stripper plate; and guide posts for maintaining operative vertical alignment of the punch unit and the die unit; wherein the top end portion of each guide post is fixed to the punch holder with the lower end portion thereof extending through each hole formed in the die holder, the blanking die and punch elements are respectively outer and inner pieces formed from a single plate by wire-cut electro-discharge machining (W.C.E.D.M.) and are directly fixed to the punch and die holders respectively, the knockout plate and the stripper plate are respectively inner and outer pieces' formed from a single plate by W.C.E.D.M.
  • W.C.E.D.M. wire-cut electro-discharge machining
  • the assembly further comprises a mount to be removably mounted on the press bolster and having a flat top surface on which the die unit and punch unit are supported and a set of holes for receiving the lower ends of the guide posts, a plurality of load-supporting elements fixed near edges of slug clearance holes of the bottom surface of the die holder to form a slug-accumulating space between the die holder and the mount which communicates with the space surrounding the die holder, and clamping means for fixing the die holder onto the mount.
  • Another aspect of this invention is that springs are contained in respective holes of the mount to thereby urge the guide posts upwardly together with the punch unit.
  • the assembly shown includes a punch unit 1, a die unit 2, and a set of guide posts 3 for maintaining operative alignment of the punch unit and the die unit.
  • Punch unit 1 is provided with a punch holder 11 which is formed with shank 12 for fixing the punch unit to a press ram (not shown).
  • a backing plate 13 is secured onto the bottom surface of punch holder 11 by bolt means, and a punch plate 14 is also secured onto the bottom surface of backing plate 13 by bolt means.
  • a piercing punch 15 is secured to punch plate 14 by being inserted into a hole of punch plate 14.
  • Punch 15 is prevented from dropping down from punch plate 14 by engagement of its top collor with a shoulder of the hole of punch plate 14, and is also prevented from moving upwardly by engagement of its top surface with backing plate 13.
  • a blanking die element 16 is supported to the bottom surface of punch plate 14 by bolt means with a spacer ring 17 therebetween.
  • a knockout plate 18 is slidably fitted into the die hole of blanking die element 16, and punch 15 extends through knockout plate 18.
  • One or more elastic members 19 of, for example, polyurethane rubber are disposed between knockout plate 18 and punch plate 14 to urge knockout plate 18 downwardly. Knockout plate 18 is also prevented from dropping down by engagement of its top outer flange with the upper edge of the die hole of blanking die element 16.
  • Die unit 2 is provided with a die holder 21 to be mounted on a press bolster (not shown), on which a die plate 22 is fixed.
  • a blanking punch element 23 corresponding to blanking die element 16 and having a die hole 23a corresponding to punch 15 is fixed to die plate 22.
  • a stripper plate 24 is slidably fitted onto blanking punch element 23 and is elastically supported on die plate 22 through one or more elastic members 25 of, for example, polyurethane rubber.
  • Die holder 21 is provided with a slug clearance hole 21a corresponding to die hole 23a of blanking punch element 23.
  • Guide posts 3 are fixed to die holder 21 and stand vertically thereon.
  • Punch holder 11 is provided with guide bushings 4 for receiving top end portions of guide posts 3, and operative vertical alignment of punch unit 1 and die unit 2 is maintained by fitting guide posts 3 into guide bushings 4.
  • the compound die assembly is mounted on a press by fixing punch unit 1 to a press ram through shank 12 and by clamping die holder 21 onto a press bolster by clamping means.
  • a blank is obtained which has an.outer shape corresponding to the outer shape of blanking punch element 23 and a hole pierced by punch element 15.
  • the blank obtained by use of the compound die assembly of Fig. 1 is shown in Fig. 2.
  • 5 is the blank and 6 is a hole formed in the blank.
  • the use of compound die assembly enables to perform blanking and piercing at one time by one press stroke, and therefore, enables to produce a lot of blanks having a hole without dimensional distribution. Accordingly, the compound die assembly is employed for production of small-sized precision parts.
  • the compound die assembly is unsuitable for production of large sized parts, in particular, such as ones having one or more slits, complicated openings and/or crowded holes as shown at a, b, and c in Fig. 3.
  • This invention attempts to provide a compound die assembly which is suitable for production of large-sized parts having many holes, complicated holes and/or slits.
  • the blank 7 has a square hole 7a and two small circular holes 7b and 7c.
  • the embodiment shown is similar to the known compound die assembly in that it has a punch unit 10, die unit 20 and guide posts 30, but is quite different from the latter in construction of those units and in that the former is provided with a mount 40 and a plurality of load-supporting elements 50.
  • Punch unit 10 includes a punch holder 101 and a blanking die element 103 which is directly fixed onto the bottom surface of punch holder 101 by bolt means 102.
  • Blanking die element 103 has a die hole corresponding to the outer shape of the desired blank.
  • Punch elements 104-106 are disposed in the die hole of blanking die element 103.
  • punch 104 is for forming square hole 7a of the blank of Fig. 4, and will be referred to as an inner blanking punch element.
  • Punches 105 and 106 are for piercing holes 7b and 7c of the blank in Fig. 4.
  • Inner blanking punch element 104 is fixed to punch holder 101 by bolt means 107 and pins 108.
  • a knockout plate 109 which has an outer shape corresponding to the die hole of blanking die element 103 and holes corresponding to punches 104-105, is fitted in the die hole of blanking die element 103, and is supported to punch holder 101 by hanger bolts 110.
  • One or more elastic members 111 of, for example, polyurethane rubber are disposed between knockout plate 109 and punch holder 101 so that knockout plate 109 can elastically sink in the die hole of blanking die element 103.
  • Elastic members 111 are formed in a ring and are fixed to punch holder by hanger bolts 110 and/or screws.
  • Die unit is provided with a die holder 201 and a die element 203 which is directly fixed onto die holder 201 by bolt means 202.
  • Die element 203 has an outer shape corresponding to the die hole of blanking die element 103 and serves as a blanking punch element.
  • Die element 203 is also provided with die holes 203a and 203b corresponding to punches 104-106.
  • a stripper plate 204 having a hole corresponding to the die hole of blanking die element 103 is fitted onto die element 203, and is supported to die holder 201 by a hanger bolts 205.
  • Elastic members 206 of, for example, polyurethane rubber are disposed between stripper plate 204 and die holder 201 so that stripper plate 204 can elastically sink from the top surface of die element 203.
  • Die holder 201 is formed with slug clearance holes 201a and 201b corresponding to die holes 203a and 203b.
  • Guide posts 30 are fixed to punch holder 101 at their top end portions and extend downwardly through blanking die element 103. The lower end portions of guide posts 30 project downwardly from die holder 201 after extending through stripper plate 204 and die holder 201.
  • Mount 40 for supporting punch unit 10 and die unit 20 is provided with a set of holes 401 for receiving the lower end portions of guide posts 30 in the flat surface.
  • Coil springs 402 are contained within the holes 401. Therefore, upon being inserted into holes 401, the lower end portions of guide posts 30 are pushed up by springs 402, so that punch unit 10 is elastically supported in a condition raised from die unit 20.
  • Die unit 20 is fixed onto mount 40 by fittings 402 and bolt means 403.
  • a plurality of load-supporting elements 50 are fixed near the opening edges of slug clearance holes 201a and 201b on the bottom surface of die holder 201. Therefore, a space is formed between the bottom surface of die holder 201 and mount 40. The space communicates with the surrounding space of the die holder and serves as accumulation of slugs.
  • load-supporting elements 50 are disposed at not peripheral edge portion but near the slug clearance holes, bending of die element 203 and die holder 201 is advantageously prevented even if holes to be pierced are slits, complicated, and/or crowded. Therefore, according to the arrangement of the compound die assembly, large-sized precision parts can be produced, and thickness of die holder 201 and die element 203 can be thin relatively.
  • blanking die and punch elements 103 and 203 are made from a sheet of plate by W.C.E.D.M.
  • W.C.E.D.M. it is known in the art to produce a die or a punch by the W.C.E.D.M., or by moving a wire 70 along an outer contour of a.desired blank with establishment of electric spark between a work plate 60 and wire of, such as, phosphor bronze 70.
  • wire 70 is inclined to form a tapered section, the separated inner and outer pieces 601 and 602 can be used as a punch and a die, respectively, so that a set of punch and die can be produced by one cutting operation.
  • the wire-inclination angle 6 must be selected in consideration of the thickness of the work plate 60 so as to make a suitable clearance L between tips of the punch 601 and die 602.
  • Die 103 and punch 203 in the embodiment of Figs. 5-10 are made by the process. According to the process, fittings of resultant punch and die is accurate in comparison with ones separately manufactured, and the working time is reduced.
  • one or more piercing die holes are also able to be formed in the resultant blanking punch element (601 in Fig. 11) by a similar W.C.E.D.M. process, and the separated pieces can be also used as punch elements.
  • inner blanking punch element 104 is made by the process, but the other punch elements 105 and 106 are formed separately.
  • Knockout plate 109 and stripper plate 204 in the embodiment of Figs. 5-8 are also made by the similar W.C.E.D.M. process but with wire 70 being not inclined.
  • mount 40 is disposed on a press bolster and is firmly fixed thereto by any suitable clamping means. Then, die unit 20 is fixed onto mount 40 by fittings and bolt means 403 and 404 after inserting coil springs 402 in holes 401 of mount 40. Thereafter, punch unit 10 is installed by inserting guide posts 30 into holes 401 of mount 40 through guide-receiving holes of stripper plate 204 and die holder 201. Thus, installation of the compound die assembly onto the press is completed. In the condition, when a work plate is put on die unit 20 and the press is operated, press ram moves downwardly to push down punch unit 10 against coil spring 402. Thus, a blank as shown in Fig. 4 is punched out.
  • punch unit 10 is raised by coil springs 402 to form a space between punch unit 10 and die unit 20 in which the work plate is disposed, so that punch unit 10 is not required to be fixed to the press ram. Therefore, installation of the die assembly onto the press is quite simple and ready, and no die-height adjustment is also required.
  • Punch elements 105 and 106 are prevented from upwardly slipping out of punch holder 101 by engagement of their top surfaces with the bottom surface of the press ram. However, if there are openings and/or depressions in the press ram surface, a flat plate may be disposed on the top surface of punch holder 101. Punch unit 10 may be fixed to the press ram if it is desired, and coil springs 402 are not necessary in that case.
  • mount 40 may be provided with a plurality of guide-post-receiving holes 401 per one guide post, so that mount 40 can be used for different punch and die units without replacement. In that case, coil springs"402 are required to be displaced in new guide-post-receiving holes.
  • mount 40 may be formed by three blocks 40a, 40b and 40c as shown in Fig. 9, with guide-post-receiving holes formed in two blocks 40a and 40b on the opposite sides, with the central block 40c being replaceable by different ones. In that arrangement, the mount can be used for supporting various punch and die units.
  • 405 represents screw holes for receiving bolts 404 for fixing die unit 20.
  • the blanking die element, punch elements, die or blanking punch element, knockout plate and stripper plate are made of alloy tool steel.
  • each load-supporting element not only a disk but also blocks of the other various shapes such as cube, rectangle or others may be used.
  • the load-supporting element is also made of alloy tool steel.
EP19820304671 1982-09-06 1982-09-06 Verbundwerkzeug Expired EP0102429B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19820304671 EP0102429B1 (de) 1982-09-06 1982-09-06 Verbundwerkzeug
DE8282304671T DE3274957D1 (de) 1982-09-06 1982-09-06 Compound die assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19820304671 EP0102429B1 (de) 1982-09-06 1982-09-06 Verbundwerkzeug

Publications (2)

Publication Number Publication Date
EP0102429A1 true EP0102429A1 (de) 1984-03-14
EP0102429B1 EP0102429B1 (de) 1987-01-07

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ID=8189767

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820304671 Expired EP0102429B1 (de) 1982-09-06 1982-09-06 Verbundwerkzeug

Country Status (2)

Country Link
EP (1) EP0102429B1 (de)
DE (1) DE3274957D1 (de)

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CN102259134A (zh) * 2011-06-29 2011-11-30 无锡市中捷减震器有限公司 具有多种功能的一次成型模具
CN102886425A (zh) * 2012-09-17 2013-01-23 芜湖市续元工贸有限公司 钣金件冲孔模
CN102941279A (zh) * 2012-10-30 2013-02-27 芜湖可挺汽车底盘件有限公司 落料冲孔模具
CN103170907A (zh) * 2013-02-25 2013-06-26 大连国盛模具制造有限公司 一种便调式抛光模具
CN103191973A (zh) * 2013-03-26 2013-07-10 王丽琴 一种冲压模具
CN103447387A (zh) * 2013-08-16 2013-12-18 芜湖世达模具有限公司 一种落料冲孔模
CN103506496A (zh) * 2013-10-14 2014-01-15 湖北三众车桥有限责任公司 后桥壳三角板冲压模
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CN103691802A (zh) * 2013-11-20 2014-04-02 无锡曙光模具有限公司 汽车发动机排气系统出气锥管外壳的切断模具
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DE2357519A1 (de) * 1973-05-29 1974-12-12 Andrew Eng Co Elektroerosionsvorrichtung mit drahtelektrode
CH564386A5 (en) * 1973-03-08 1975-07-31 Styner & Bienz Ag Press tool stripper plate and ejection pad - is made from polyurethane foam to reduce overall tool height and setting up time
DE2505667A1 (de) * 1975-02-11 1976-08-19 Pkm Planungsgesellschaft Fuer Werkzeug zum stanzen und/oder praegen

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US1543010A (en) * 1925-06-23 X x x x x p punch
US3125917A (en) * 1964-03-24 Punch and die assembly having spaced tool positioning plates
CH325224A (fr) * 1952-12-03 1957-10-31 Patrignani Leonida Installation permettant d'assurer un cycle complet de travail sur des machines industrielles, notamment des presses, marteaux-pilons, moutons, machines à estamper
DE2144085A1 (de) * 1971-09-02 1973-03-08 Siemens Ag Verfahren zur herstellung von teilen fuer schnittwerkzeuge, wie matrizen, stempel oder auch andere formkoerper mit hintersetzten flaechen, aus einem vorzugsweise planparallele flaechen aufweisenden werkstueck durch elektrothermisches drahterodieren sowie drahterodiermaschine zur durchfuehrung des verfahrens
CH564386A5 (en) * 1973-03-08 1975-07-31 Styner & Bienz Ag Press tool stripper plate and ejection pad - is made from polyurethane foam to reduce overall tool height and setting up time
DE2357519A1 (de) * 1973-05-29 1974-12-12 Andrew Eng Co Elektroerosionsvorrichtung mit drahtelektrode
DE2505667A1 (de) * 1975-02-11 1976-08-19 Pkm Planungsgesellschaft Fuer Werkzeug zum stanzen und/oder praegen

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* Cited by examiner, † Cited by third party
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CN102259134B (zh) * 2011-06-29 2012-12-19 无锡市中捷减震器有限公司 具有多种功能的一次成型模具
CN102259134A (zh) * 2011-06-29 2011-11-30 无锡市中捷减震器有限公司 具有多种功能的一次成型模具
CN102886425A (zh) * 2012-09-17 2013-01-23 芜湖市续元工贸有限公司 钣金件冲孔模
CN102941279A (zh) * 2012-10-30 2013-02-27 芜湖可挺汽车底盘件有限公司 落料冲孔模具
CN103170907A (zh) * 2013-02-25 2013-06-26 大连国盛模具制造有限公司 一种便调式抛光模具
CN103191973A (zh) * 2013-03-26 2013-07-10 王丽琴 一种冲压模具
CN103447387A (zh) * 2013-08-16 2013-12-18 芜湖世达模具有限公司 一种落料冲孔模
CN103506496A (zh) * 2013-10-14 2014-01-15 湖北三众车桥有限责任公司 后桥壳三角板冲压模
CN103691802A (zh) * 2013-11-20 2014-04-02 无锡曙光模具有限公司 汽车发动机排气系统出气锥管外壳的切断模具
CN103639265A (zh) * 2013-11-26 2014-03-19 梧州恒声电子科技有限公司 一种导磁片落料模具的下模结构
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