EP0181269B1 - Presswerkzeug mit unter der Presse abnehmbaren Werkteilen - Google Patents

Presswerkzeug mit unter der Presse abnehmbaren Werkteilen Download PDF

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Publication number
EP0181269B1
EP0181269B1 EP85402145A EP85402145A EP0181269B1 EP 0181269 B1 EP0181269 B1 EP 0181269B1 EP 85402145 A EP85402145 A EP 85402145A EP 85402145 A EP85402145 A EP 85402145A EP 0181269 B1 EP0181269 B1 EP 0181269B1
Authority
EP
European Patent Office
Prior art keywords
tool
blank holder
punch
stroke
punches
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
Application number
EP85402145A
Other languages
English (en)
French (fr)
Other versions
EP0181269A1 (de
Inventor
Dorice Vrignaud
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.)
Esswein SA
Original Assignee
Esswein SA
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 Esswein SA filed Critical Esswein SA
Publication of EP0181269A1 publication Critical patent/EP0181269A1/de
Application granted granted Critical
Publication of EP0181269B1 publication Critical patent/EP0181269B1/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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • 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
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
    • 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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/003—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass in punching machines or punching tools
    • B21D45/006—Stripping-off devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096—Means to move product out of contact with tool
    • Y10T83/2135—Moving stripper timed with tool stroke
    • Y10T83/2137—And alternatively movable to or from operating position
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096—Means to move product out of contact with tool
    • Y10T83/2135—Moving stripper timed with tool stroke
    • Y10T83/215—Carried by moving tool element or its support
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/566—Interrelated tool actuating means and means to actuate work immobilizer
    • Y10T83/5669—Work clamp
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/748—With work immobilizer
    • Y10T83/7487—Means to clamp work
    • Y10T83/7493—Combined with, peculiarly related to, other element
    • Y10T83/75—With or to tool guide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • Y10T83/9473—For rectilinearly reciprocating tool

Definitions

  • the present invention relates to a press tool with removable working parts in press, intended in particular for work carried out on sheets.
  • tools are usually used which are mounted on presses for punching, stamping, bending, etc. operations.
  • These tools generally include each, working parts such as punches and dies which are subject to more or less rapid wear, holding parts such as punch holders, die holders, fixing soles which are mounted respectively on the slide and the press table, and a blank holder usually intended both to securely hold a sheet subjected to shaping and to guide in their sliding these punches.
  • the press tools are usually designed so that at rest or at the end of their withdrawal or release stroke, the ends of their punches are still partially engaged in the guide holes trained in their blank holder.
  • the standardized elements mainly comprise, on the one hand, matched or identical plates provided with standardized holes and intended to constitute a blank holder and soles for holding the punches and dies, and on the other hand, punches and dies having in their parts, in assembly with these plates, dimensions adjusted to those of the corresponding standardized holes of these latter plates.
  • the clamp-flsn intended to hold in place a sheet of material subjected to an operation in the tool and to guide the punches in their sliding, is itself guided by guide columns of which a shoulder cooperates with a sleeve system sliding and with stop screw, in order to limit the travel of these blank holders so as to maintain these punches under a permanent guide of this blank holder.
  • these sanders both during their rest and during their work, never completely disengage from this hold-down. Thus, to change or replace them, you must disassemble and remove the entire tool from the press on which this tool is mounted.
  • the object of the present invention is to avoid these drawbacks, which makes it possible to produce an economic press tool with working parts, in particular punches, which can be dismantled in a press, intended to be mounted on a press for carrying out sheet forming operations such as punching, stamping, bending, cutting, etc.
  • a press tool having working parts in the form of one or more dies and one or more punches, and a blank holder guiding this or these punches in their displacement and now in place against this or these dies, in its working stroke, a sheet subjected to shaping, is characterized in that it is provided, between the die (s) and the punch (s), a blank holder which performs at least one normal stroke of work and two withdrawal strokes of your choice, namely a normal withdrawal stroke and an intervention withdrawal stroke, in a normal withdrawal stroke, the blank holder partially retaining this or these punches, and in the withdrawal stroke d 'intervention, the blank holder completely disengaging from this or these punches.
  • a press tool is usually called a press tool which operates only once, on a sheet blank to give it a more or less complex shape. Operations such as cutting, folding, stamping, etc. generally cannot all be done with a single tool but they are done on a range of recovery tools.
  • Called tracking tool in general a tool comprising several aligned work stations, one arranged after the other on which a strip of sheet metal or metal is scrolled in a determined pitch to achieve on this strip of sheet metal by each work station a pre-established operation such as punching, stamping, bending, cutting ... and obtain at the exit of the last station a finished part detached from this strip of sheet metal and having a more or less complex shape.
  • the press tool 1 comprises at least firstly a die 5 held by a die holder 8 and a lower fixing base 11 which is mounted on the table 3 of the press 2, secondly a punch 12 held in a punch holder hoop 15 and an upper fixing sole 18 which is mounted on the slide 4 of the press 2, the table 3 and the slide 4 of which are shown diagrammatically in broken lines.
  • the press tool 1 comprises at least firstly a die 5 held by a die holder 8 and a lower fixing base 11 which is mounted on the table 3 of the press 2, secondly a punch 12 held in a punch holder hoop 15 and an upper fixing sole 18 which is mounted on the slide 4 of the press 2, and thirdly a blank holder 19 disposed between this die 5 and this punch and intended both to hold in place a sheet metal strip 20 against this die 5 and to guide this punch in their movement 12.
  • the die 5 and the die holder 8 fixed on their common sole 11 are removable and removable with respect to the latter. The same applies to the punch 12 and the punch holder 15 relative to the upper fixing flange 18.
  • FIG. 1 a The end of the normal working stroke of the slider 4 of the press 2 which coincides with the end of the normal working stroke of the tool 1 is shown in FIG. 1 a while the end of the normal withdrawal stroke of the slider 4 of the press 2 which coincides with the end of the normal withdrawal stroke of the tool 1 is illustrated in FIG. 1 b.
  • the press tool 1 is provided between the punch 12 and the die 5 with a blank holder 19 which performs at least one normal working stroke and two retraction strokes of your choice, namely a normal stroke withdrawal and an intervention withdrawal run.
  • the blank holder 19 guides the punch 12 in their movement and maintains, at the end of this stroke, the sheet metal strip 20 firmly in place against the matrix 5.
  • the blank holder 19 is released from the die 5 but the punch 12 still remains partially engaged in the corresponding guide hole 21 in this blank holder 19.
  • the blank holder 19, the punch 12 and its punch holder 15 and the upper fixing sole 18 carried by the slide 4 of the press 2, are guided respectively in their movement during their working and withdrawal strokes, opposite -screw of the die 5 and its die holder 8 and the bottom flange 11 fixed to the table 3 of the press 2, by four columns 22 (Figure 3), one of which is shown in partial section in Figure 2.
  • the guide columns 22 are, in the example illustrated, ball columns of a known type.
  • the blank holder 19 for carrying out its normal working stroke and its two withdrawal strokes of choice is mechanically connected to the upper fixing base 18 which supports the punch 12 and its punch holder 15 by sliding connection devices 23 which each include two stops of choice, one marking the end of its normal withdrawal stroke where the punch 12 is still partially engaged in the blank holder 19, and the other representing the end of its intervention withdrawal stroke where the punch 12 is completely outside of this blank holder 19.
  • These sliding connection devices 23 which are four in number in the example illustrated (FIG. 3) comprise (FIGS. 1 a, 1 b, 1 c, 2, 4) each a sheath 25 fixed to the blank holder 19, a retaining screw with stop head 24 fixed to the upper sole 18 of the tool, through this sheath 25 and a movable or retractable fork 26 engaging on this screw 24 between the head thereof and the bottom of the sheath 25.
  • the sheath 25 and the movable fork 26 serve respectively as an intervention withdrawal end-of-travel stop and as a normal withdrawal end-of-travel stop.
  • the sleeve or stop 25 is constituted by a part provided with a longitudinal section having the shape of an inverted elongated U with a drilled bottom for the sliding of the retaining screw with stop head 24, with side wall provided with a passage opening 31 for the fork 26, and with a free end provided with a retaining shoulder. These shoulders can be provided with holes for fixing screws 27.
  • the sheath or stop 25 has a length greater than the thickness of the blank holder 19 so that when this sheath 25 is fixed by screws 27 to this blank holder 19 through a corresponding hole 28 formed in the latter, the bottom of this stop 25 projects from the face of the blank holder opposite to the fixing face, of a length equal to the thickness of the fork or retractable stop 26 increased by the thickness of the bottom of this sheath or stop 25.
  • the fork or retractable stop 26 is constituted by a piece with two branches extended by a handle 29 which can be provided laterally with two wings 30 not shown. These wings 30 give the fork or stop e 26 good stability in its movement during its retraction or its establishment.
  • the four forks or stops 26 are fixed to the same control device 32 which communicates to them a simultaneous movement in their movement during their positioning or their retraction.
  • This control device 32 comprises a front rod 33 and two sliding lateral tie rods 34, 35 to which the forks or stops are fixed 26.
  • the frontal rod 33 is provided with handles 36 and the two tie rods 34, 35 are mounted sliding along the edges sides of the blank holder 19 according to a known technique.
  • the forks or stops 26 are simultaneously inserted in the corresponding sleeves or stops 25 between the bottoms thereof and the heads d 'stop of the sliding retaining screw 24, and in this case the blank holder 19 has a normal working stroke and a normal withdrawal stroke.
  • the punch 12, the die 5, the blank holder 19 and the sheet metal strip 20 assume respectively the positions represented in FIGS. 1 a, 1 b and 2 and at the end of a normal withdrawal stroke of the tool 1, in the sliding connection devices 23, the heads of the retaining screws 24 are stopped by the forks or stops 26, and in the tool 1 the punch, die and clamp blank respectively have positions partially illustrated in Figure 1 b.
  • the forks or stops 26 are simultaneously retracted, that is to say withdrawn outside the sleeves or stops 25, to using the control device 32, and in this case the blank holder 19 has a normal working stroke similar to that of normal operation of the tool 1 and an intervention withdrawal stroke illustrated in FIG. 1 c where the heads of the retaining screws 24 are stopped respectively by the bottoms of the sleeves or stops 25, and not by the forks or stops 26 which are already retracted or withdrawn.
  • the blank holder 19 moves away from the upper fixing flange 18 which carries the punch or punches, by a distance (FIG.
  • the punch (s) 12 can thus be easily disassembled or removed at the same time as the die (s) 5 without requiring disassembly of the tool 1 outside the press to effect their change, replacement or maintenance.
  • the tool 1 produced according to the invention thus makes it possible to avoid a waste of time and an additional cost of labor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Press Drives And Press Lines (AREA)
  • Punching Or Piercing (AREA)

Claims (7)

1. Presswerkzeug mit aktiven Teilen in Form von einer bzw. mehreren Matrizen (5) und einem bzw. mehreren Stempeln (12) und mit einem Blech-Niederhalter (19), der diesen bzw. diese Stempel in ihrer Verschiebung führt und gegen diese Matrize bzw. diese Matrizen ein Blech-(20) in seinem Arbeitshub in Stellung hält, das einer Formgebung unterzogen wird, dadurch gekennzeichnet, dass es zwischen der Matrize bzw. den Matritzen (5) und dem Stempel bzw. den Stempeln (12) mit einem Blech-Niederhalter (19) versehen ist, der wenigstens einen normalen Arbeitshub und wahlweise zwei Rückhübe ausführt, nämlich einen normalen Rückhub und einen Eingriffs-Rückhub, wobei der Blech-Niederhalter (19) in dem normalen Rückhub den bzw. die Stempel (12) teilweise zurückhält und wobei in dem Eingriffs-Rückhub der Blech-Niederhalter (19) sich ganz von diesem Stempel bzw. diesen Stempeln trennt.
2. Werkzeug nach Anspruch 1, mit einer oberen Platte (18), die an einem Pressenstössel (4) einer Presse (2) befestigt ist und den bzw. die Stempel (12) sowie die Stempelhalter trägt, und mit einer unteren Platte (11), die an einem Tisch (3) dieser Presse befestigt ist und die Matrize bzw. die Matrizen (5) sowie die Matrizenhalter trägt, dadurch gekennzeichnet, dass der Blech-Niederhalter (19), um seinen normalen Arbeitshub und seine zwei Wahl-Rückhübe auszuführen, mit der oberen Platte (18) des Werkzeugs über gleitende Verbindungseinrichtungen (23) mechanisch verbunden ist, wovon jede wahlweise zwei Anschläge (25, 26) umfasst, wobei der eine das Ende seines normalen Rückhubes markiert, wo der bzw. die Stempel (12) in dem Blech-Niederhalter (19) teilweise gehalten bleiben, und der andere das Ende seines Eingriffs-Rückhubes darstellt, wo der bzw. die Stempel (12) sich gänzlich ausserhalb dieses Blech-Niederhalters (19) befinden.
3. Werkzeug nach Anspruch 2, dadurch gekennzeichnet, dass jede der gleitenden Verbindungseinrichtungen (23) eine Halteschraube (24) mit Haltekopf umfasst, die an der oberen Platte (18) des Werkzeugs befestigt ist, und wahlweise einen ersten Anschlag (25) in Form einer Hülse, die auf dieser Schraube (24) gleitend gelagert und an dem Blech-Niederhalter (19) befestigt ist, um als Anschlag für das Eingriffs-Rückhubende zu dienen, sowie wahlweise einen zweiten Anschlag (26) in Form einer Gabel aufweist, der je nachdem, ob er in dieser Hülse zwischen dem einziehbaren Kopf dieser Halteschraube (24) und dem Boden dieser Hülse (25) gehalten ist oder von dieser Hülse (25) gelöst ist, entweder einen normalen Rückhub dieses Blech-Niederhalters (19) oder einen Eingriffs-Rückhub dieses Blech-Niederhalters (19) bestimmt.
4. Werkzeug nach Anspruch 3, dadurch gekennzeichnet, dass in den gleitenden Verbindungseinrichtungen (23) die Hülse (25) aus einem Teil besteht, das einen Längsschnitt in Form eines gestreckten, umgekehrten U aufweist, wovon die Seitenwand mit einer Durchgangsöffnung (31) für die Gabel (26) versehen ist und mit einem freien Ende, das mit einer Halteschulter versehen ist.
5. Werzeug nach einem der Ansprüche 3 und 4, dadurch gekennzeichnet, dass in gleitenden Verbindungseinrichtungen (23) die Gabel (26) aus einem Teil mit zwei Armen besteht, das durch einen Griff (29) verlängert ist, welcher aus der Hülse (25) herausragt.
6. Werkzeug nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass in den gleitenden Verbindungseinrichtungen (23) die Gabeln (26) an einer selben Steuervorrichtung (32) befestigt sind, die bei deren Instellungbringen oder Einziehen eine gleichzeitige Bewegung bei ihrer Verlagerung überträgt.
7. Werkzeug nach Anspruch 6, dadurch gekennzeichnet, dass die Vorrichtung zur Steuerung der Gabel (26) der gleitenden Verbindungseinrichtungen (23) eine stirnseitige Schiene (33) gleitende Seitenbolzen (34, 35), an welche diese Gabeln (26) befestigt sind, umfasst.
EP85402145A 1984-11-09 1985-11-06 Presswerkzeug mit unter der Presse abnehmbaren Werkteilen Expired EP0181269B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8417112 1984-11-09
FR8417112A FR2572963B1 (fr) 1984-11-09 1984-11-09 Outil de presse a parties travaillantes demontables sous presse

Publications (2)

Publication Number Publication Date
EP0181269A1 EP0181269A1 (de) 1986-05-14
EP0181269B1 true EP0181269B1 (de) 1988-12-28

Family

ID=9309437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85402145A Expired EP0181269B1 (de) 1984-11-09 1985-11-06 Presswerkzeug mit unter der Presse abnehmbaren Werkteilen

Country Status (8)

Country Link
US (1) US4656902A (de)
EP (1) EP0181269B1 (de)
JP (1) JPH0613160B2 (de)
AU (1) AU584686B2 (de)
CA (1) CA1264420A (de)
DE (1) DE3566960D1 (de)
ES (1) ES8700986A1 (de)
FR (1) FR2572963B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104399819A (zh) * 2014-11-28 2015-03-11 吴中区光福华宇钣金厂 一种新型钣金冲压模具

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU6361599A (en) * 1999-03-09 2000-09-28 Dynacraft Industries Sdn. Bdh. Precision stamping tool
CN101879790B (zh) * 2010-06-30 2013-01-02 张云亮 冲压模具压卸料装置及用于冲压模具压卸料装置的顶杆
CN102228942B (zh) * 2011-04-27 2013-04-17 浙江大学 带自动脱模机构的半固态金属微触变成形装置
CN103071730A (zh) * 2013-01-30 2013-05-01 华一精密机械(昆山)有限公司 冲压成型标准件连续冲压模具
CN103611821A (zh) * 2013-12-10 2014-03-05 安徽江淮汽车股份有限公司 一种单人单机冲压生产模具结构
CN104148469B (zh) * 2014-06-30 2018-11-30 万盛兴精密技术（惠州）有限公司 一种快速成型模具制作装置及其制作方法
CN105478589A (zh) * 2015-11-30 2016-04-13 吴中区光福良盛机械厂 一种金属连接角级进模具的公模
CN107971406B (zh) * 2017-12-14 2024-02-06 安徽永舟文具有限公司 高精密保密型笔夹模具
IT201900019421A1 (it) * 2019-10-21 2021-04-21 Salvagnini Italia Spa Apparato di punzonatura
US11511331B2 (en) * 2019-12-18 2022-11-29 Express Products, Inc. Die stacker

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US3125917A (en) * 1964-03-24 Punch and die assembly having spaced tool positioning plates
US3140630A (en) * 1960-10-31 1964-07-14 Lewis H Wolf Stripper spring unit for presses
US3673902A (en) * 1970-02-09 1972-07-04 Walter Strobel Die set; fixture and method of making dies
US4103574A (en) * 1974-08-01 1978-08-01 Greer H William Tool assembly, method of manufacture and components thereof
FR2413207A1 (fr) * 1977-12-29 1979-07-27 Cornercroft Eng Ltd Dispositif de presse comprenant un ensemble elastique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104399819A (zh) * 2014-11-28 2015-03-11 吴中区光福华宇钣金厂 一种新型钣金冲压模具

Also Published As

Publication number Publication date
JPS61115700A (ja) 1986-06-03
AU5499886A (en) 1987-09-24
US4656902A (en) 1987-04-14
FR2572963B1 (fr) 1986-12-12
ES8700986A1 (es) 1986-11-16
JPH0613160B2 (ja) 1994-02-23
CA1264420A (fr) 1990-01-16
AU584686B2 (en) 1989-06-01
DE3566960D1 (en) 1989-02-02
EP0181269A1 (de) 1986-05-14
FR2572963A1 (fr) 1986-05-16
ES548702A0 (es) 1986-11-16

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