EP0927584B1 - Dispositif de poinçonnage - Google Patents

Dispositif de poinçonnage Download PDF

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Publication number
EP0927584B1
EP0927584B1 EP19970830563 EP97830563A EP0927584B1 EP 0927584 B1 EP0927584 B1 EP 0927584B1 EP 19970830563 EP19970830563 EP 19970830563 EP 97830563 A EP97830563 A EP 97830563A EP 0927584 B1 EP0927584 B1 EP 0927584B1
Authority
EP
European Patent Office
Prior art keywords
blankholder
disk
punch
cylindrical tubular
tubular body
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
EP19970830563
Other languages
German (de)
English (en)
Other versions
EP0927584A1 (fr
Inventor
Eugenio Perazzolo
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.)
Rainer SRL
Original Assignee
Rainer SRL
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 Rainer SRL filed Critical Rainer SRL
Priority to EP19970830563 priority Critical patent/EP0927584B1/fr
Priority to DE1997602986 priority patent/DE69702986T2/de
Publication of EP0927584A1 publication Critical patent/EP0927584A1/fr
Application granted granted Critical
Publication of EP0927584B1 publication Critical patent/EP0927584B1/fr
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
    • 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
    • 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
    • B21D28/34—Perforating tools; Die holders

Definitions

  • the present invention relates to a punch assembly according to the preamble of claim 1 (see for example DE-C-19505754).
  • Known punch assemblies comprise a cylindrical tubular body or casing extending coaxially with a reference axis and fitted integrally at the bottom end with a blankholder disk which is placed on the work sheet; and a substantially cylindrical toolholder body extending coaxially with the reference axis, and an end portion of which slides axially inside the casing.
  • Known punch assemblies also comprise a punch screwed to the end of the toolholder body inside the casing, so as to engage in sliding manner a through hole in the blankholder disk; and an elastic element located between the top end of the casing which is not provided with the blankholder disk and the end of the toolholder body outside the casing, to keep the punch in a withdrawn position in which the cutting end of the punch engages the through hole in the blankholder disk but does not project outwards of the casing.
  • the end of the toolholder body outside the casing is designed to receive a ram, which, for a given time, exerts such pressure as to overcome the resistance of the elastic element and move the punch from the withdrawn position into a work position in which the cutting end of the punch projects outwards of the casing through the hole in the blankholder disk.
  • a major drawback of punch assemblies of the above type is that repeated grinding eventually results in the cutting end of the punch backing up gradually inside the casing, so that the travel of the ram must be checked periodically by the operator to ensure the cutting end of the punch projects as required from the blankholder disk in the work position.
  • Number 1 in Figure 1 indicates as a whole a punch assembly for use on a known punching machine.
  • Punch assembly 1 comprises a cylindrical tubular body 2 extending coaxially with a longitudinal axis A and fitted at the bottom end with a blankholder disk 3, which is placed on the work sheet; a toolholder body 4 extending coaxially with axis A and having an end portion movable axially inside cylindrical tubular body 2; and a punch 5 housed inside cylindrical tubular body 2 and fitted integrally to the bottom end of toolholder body 4 facing blankholder disk 3.
  • Punch 5 comprises a cutting end 5a, which engages in sliding manner a through hole formed in blankholder disk 3.
  • cylindrical tubular body 2 comprises a liner 6 extending coaxially with axis A along substantially the whole length of cylindrical tubular body 2, and defining, inside cylindrical tubular body 2, a prismatic, substantially octagonal axial cavity 7. More specifically, the section of axial cavity 7 is defined by an octagon having four flat sides alternating with four curved sides in turn defined by respective arcs of the circle in which the octagon is inscribed.
  • toolholder body 4 comprises two elements, in particular a prismatic body and a sleeve, connected to each other to permit adjustment of the total axial length of toolholder body 4.
  • the prismatic body hereinafter marked at 8, has a section complementary to that of axial cavity 7 so as to engage axial cavity 7 in sliding manner, is fitted with punch 5 at one end, and comprises, at the opposite end, a threaded shank 9 projecting outwards of cylindrical tubular body 2.
  • the sleeve extends coaxially with axis A and outwards of cylindrical tubular body 2, is at least partly screwed to threaded shank 9, and comprises a ring nut 11 at one end and a shoulder 12 at the other end. Shoulder 12 is shaped to engage axial cavity 7 in sliding manner, and ring nut 11 is screwed to the end of sleeve 10 opposite the end facing prismatic body 8.
  • Sleeve 10 engages in sliding manner a bush 13 inserted inside a seat formed on the end of cylindrical tubular body 2 opposite the end fitted with blankholder disk 3; bush 13 is locked inside the seat, e.g. by means of a known lock ring 13a, and is so sized as to prevent withdrawal of shoulder 12 from axial cavity 7.
  • Punch assembly 1 also comprises an elastic element 14 (in the example shown, a coil spring) extending coaxially with axis A and outside sleeve 10, so that a first end rests on ring nut 11, and a second end rests on the top end of cylindrical tubular body 2.
  • the second end of elastic element 14 also rests on bush 13 of cylindrical tubular body 2.
  • Elastic element 14 provides for keeping toolholder body 4 in a rest position, wherein shoulder 12 of sleeve 10 contacts bush 13, punch 5 is fully withdrawn inside cylindrical tubular body 2, and cutting end 5a engages the through hole in blankholder disk 3 without projecting outwards.
  • Ring nut 11 is designed to receive a known ram, by which sufficient axial force is exerted on ring nut 11 to compress elastic element 14, move ring nut 11 towards bush 13 and toolholder body 4 towards the work sheet, and so move punch 5 into a work position wherein cutting end 5a engages the through hole in blankholder disk 3 and projects outwards of cylindrical tubular body 2.
  • the distance between prismatic body 8 and blankholder disk 3 may therefore be adjusted by screwing or unscrewing threaded shank 9 inside sleeve 10.
  • Adjusting the position of prismatic body 8 inside axial cavity 7 provides for so adjusting the position of punch 5 that, in the rest position, cutting end 5a is located a given distance D from the end of the through hole in blankholder disk 3. This is particularly useful when, as a result of grinding, the axial length of punch 5 is reduced so that cutting end 5a withdraws inside the through hole in blankholder disk 3.
  • punch 5 comprises a prismatic central portion 15 of a section complementary to that of axial cavity 7; a front portion 16 comprising cutting end 5a; and a substantially T-shaped rear portion 17, which engages a seat 18 formed in prismatic body 8, at the opposite end to threaded shank 9, to enable fast replacement of punch 5. More specifically, seat 18 is so formed as to enable rear portion 17 to be withdrawn from seat 18 by moving punch 5 perpendicularly to axis A with respect to toolholder body 4.
  • the bottom end of cylindrical tubular body 2 comprises a seat 19 for housing blankholder disk 3, and which is substantially U-shaped and extends in a plane perpendicular to axis A to permit lateral insertion of blankholder disk 3.
  • a substantially annular groove 20 is formed inside seat 19, at the extension of axial cavity 7, and is engaged by a lock ring 21 on the peripheral edge of blankholder disk 3.
  • the top end of cylindrical tubular body 2 comprises an annular projection 22 coaxial with axis A, and on which an elastic element (not shown) of the punching machine abuts.
  • punch assembly 1 is the possibility, when fitting punch 5 to toolholder body 4, of adjusting the position of punch 5 inside axial cavity 7, so that cutting end 5a of punch 5 is always the same distance from the end of the through hole in blankholder disk 3. As a result, the travel of the ram need no longer be checked each time cutting end 5a of punch 5 is ground, thus greatly reducing the routine maintenance time of the machine.
  • dividing toolholder body 4 into prismatic body 8 and sleeve 10 makes for a modular structure and for greatly simplifying assembly of punch assembly 1. Being engaged permanently between ring nut 11 of sleeve 10 and bush 13 of cylindrical tubular body 2, elastic element 14, in fact, may be extracted together with sleeve 10, with no need to fully dismantle punch assembly 1, as at present.
  • punch assembly 1 is the particular shape of seat 19, which provides for faster maintenance of punch 5 by permitting fast removal of blankholder disk 3.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)

Claims (8)

  1. Ensemble de poinçonnage (1) comprenant un corps tubulaire cylindrique (2) s'étendant coaxialement à un axe donné (A), un disque serre-flan (3) à une première extrémité du corps tubulaire cylindrique (2), un corps de porte-outil (4) comportant au moins une partie d'extrémité coulissant axialement à l'intérieur dudit corps tubulaire cylindrique (2), un poinçon (5) qui est adapté de façon intégrée à l'extrémité du corps de porte-outil (4) faisant face audit disque de serre-flan (3), et dont une extrémité de coupe (5a) s'engage par coulissement dans un trou traversant formé dans le disque de serre-flan (3), et un élément élastique (14) destiné à maintenir ledit corps de porte-outil (4) dans une position de repos dans laquelle le poinçon (5) est rétracté à l'intérieur du corps tubulaire cylindrique (2),
    dans lequel ledit corps de porte-outil (4) est divisé en un premier (10) et un second (8) éléments reliés l'un à l'autre de façon à permettre l'ajustement de la longueur axiale totale du corps de porte-outil (4), l'élément élastique (14) étant interposé entre le corps tubulaire cylindrique (2) et ledit premier élément (10), et le poinçon (5) étant adapté de façon intégrée sur ledit second élément (8) afin de permettre l'ajustement de la position du poinçon (5) par rapport au disque de serre-flan (3) et de maintenir ainsi l'extrémité de coupe (5a) à une distance donnée (D) par rapport au trou traversant dans le disque de serre-flan (3), en faisant varier la longueur axiale totale du corps de porte-outil (4),
    l'ensemble de poinçonnage étant caractérisé en ce que ledit corps tubulaire cylindrique (2) comprend une chemise (6) s'étendant sur pratiquement toute la longueur axiale du corps tubulaire cylindrique (2) et formée de manière à définir une cavité axiale (7) constituant une section transversale pratiquement polygonale, et en ce qu'un épaulement (12) dudit premier élément (10) est de forme telle qu'il s'engage de façon complémentaire dans ladite cavité axiale (7) d'une manière coulissante.
  2. Ensemble de poinçonnage selon la revendication 1, caractérisé en ce que ladite section polygonale de ladite cavité axiale (7) est une section octogonale définie par quatre parties droites alternant avec quatre arcs.
  3. Ensemble de poinçonnage selon la revendication 1, caractérisé en ce que ledit second élément (8) constitue un corps prismatique (8), qui s'engage de façon complémentaire dans ladite cavité axiale (7) de manière coulissante, est muni dudit poinçon (5) à l'extrémité faisant face au disque de serre-flan (3), et comprend à son tour à l'extrémité opposée, une tige filetée (9) vissée au moins partiellement à l'intérieur dudit premier élément (10).
  4. Ensemble de poinçonnage selon la revendication 3, caractérisé en ce que ledit premier élément (10) constitue un manchon (10), qui s'étend coaxialement audit axe donné (A), dépasse vers l'extérieur dudit corps tubulaire cylindrique (2), comprend à son tour une partie d'extrémité vissée au moins partiellement sur ladite tige filetée (9), et est muni de façon solidaire d'un écrou en anneau (11) sur l'extrémité opposée au corps prismatique (8), ledit élément élastique (14) comprenant une première extrémité reposant sur ledit écrou en anneau (11), et une seconde extrémité reposant sur ledit corps tubulaire cylindrique (2), de façon à maintenir l'écrou en anneau (11) à une distance donnée par rapport audit disque de serre-flan (3), lorsque ledit corps de porte-outil (4) est dans la position de repos.
  5. Ensemble de poinçonnage selon la revendication 4, caractérisé en ce que l'extrémité du manchon (10) opposée au corps prismatique (8) comprend ledit épaulement (12) qui s'engage de manière coulissante dans ladite cavité axiale (7), et ledit corps tubulaire cylindrique (2) comprend, sur l'extrémité opposée au disque de serre-flan (3), une douille (13) engagée de manière coulissante par ledit manchon (10), ladite douille (13) étant formée de façon à empêcher le retrait dudit épaulement (12) de ladite cavité axiale (7), et ledit élément élastique (14) maintenant ledit épaulement (12) contre ladite douille (13) lorsque le corps de porte-outil (4) est dans la position de repos.
  6. Ensemble de poinçonnage selon l'une quelconque des revendications 3, 4 ou 5, caractérisé en ce que ledit poinçon (5) comprend une partie centrale pratiquement prismatique (15) s'engageant dans la cavité axiale (7) d'une manière coulissante, une partie avant (16) comprenant ladite extrémité de coupe (5a), et une partie arrière mise en forme (17) s'engageant dans un premier siège (18) formé sur l'extrémité du corps prismatique (8) faisant face au disque de serre-flan (3).
  7. Ensemble de poinçonnage selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit disque de serre-flan (3) est logé à l'intérieur d'un second siège (19) formé sur l'extrémité du corps tubulaire cylindrique (2), ledit second siège (19) étant pratiquement en forme de U pour permettre l'insertion latérale du disque de serre-flan (3).
  8. Ensemble de poinçonnage selon la revendication 7, caractérisé en ce que le bord périphérique dudit disque de serre-flan (3) comprend une bague de verrouillage (21) destinée à s'engager dans une gorge (20) formée dans ledit second siège (19).
EP19970830563 1997-11-03 1997-11-03 Dispositif de poinçonnage Expired - Lifetime EP0927584B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19970830563 EP0927584B1 (fr) 1997-11-03 1997-11-03 Dispositif de poinçonnage
DE1997602986 DE69702986T2 (de) 1997-11-03 1997-11-03 Stanzwerkzeug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19970830563 EP0927584B1 (fr) 1997-11-03 1997-11-03 Dispositif de poinçonnage

Publications (2)

Publication Number Publication Date
EP0927584A1 EP0927584A1 (fr) 1999-07-07
EP0927584B1 true EP0927584B1 (fr) 2000-08-30

Family

ID=8230836

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970830563 Expired - Lifetime EP0927584B1 (fr) 1997-11-03 1997-11-03 Dispositif de poinçonnage

Country Status (2)

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EP (1) EP0927584B1 (fr)
DE (1) DE69702986T2 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2038690A (en) * 1978-11-20 1980-07-30 Mercer Nairne & Co Ltd Improved punch assembly
US4261237A (en) * 1979-03-16 1981-04-14 Houdaille Industries, Inc. Rigidly supported molded plastics material punch guide and stripper
US4440052A (en) * 1980-09-12 1984-04-03 Unipunch Products, Inc. Punch assembly with unitary stripper spring assembly
US5329835A (en) * 1992-10-07 1994-07-19 Wilson Tool International, Inc. Adjustable length punch set assembly
JP2610768B2 (ja) * 1993-03-31 1997-05-14 株式会社アマダメトレックス パンチング金型
DE19505754C1 (de) * 1995-02-20 1996-05-02 Mate Punch And Die Gmbh Stanzstempeleinheit

Also Published As

Publication number Publication date
EP0927584A1 (fr) 1999-07-07
DE69702986T2 (de) 2001-03-29
DE69702986D1 (de) 2000-10-05

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