EP0325947A2 - Progressive method and die for punched parts - Google Patents

Progressive method and die for punched parts Download PDF

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Publication number
EP0325947A2
EP0325947A2 EP89100405A EP89100405A EP0325947A2 EP 0325947 A2 EP0325947 A2 EP 0325947A2 EP 89100405 A EP89100405 A EP 89100405A EP 89100405 A EP89100405 A EP 89100405A EP 0325947 A2 EP0325947 A2 EP 0325947A2
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EP
European Patent Office
Prior art keywords
punched
die
stamped
embossing
punch
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
EP89100405A
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German (de)
French (fr)
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EP0325947A3 (en
EP0325947B1 (en
Inventor
Reinhard Tusch
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E Winkemann & Co KG GmbH
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E Winkemann & Co KG GmbH
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Publication of EP0325947A2 publication Critical patent/EP0325947A2/en
Publication of EP0325947A3 publication Critical patent/EP0325947A3/en
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Publication of EP0325947B1 publication Critical patent/EP0325947B1/en
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    • 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
    • B21D53/00—Making other particular articles
    • B21D53/16—Making other particular articles rings, e.g. barrel hoops
    • 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
    • B21D37/08—Dies with different parts for several steps in a process

Definitions

  • the invention relates to a follow-up process for the production of stamped parts in several steps, such as shaping steps, catching step and punch cutout, the punched part being cut out by a punch in accordance with the outer contour of the punched part in cooperation with a die.
  • the punch cut-out always creates a punch feed, see DIN 6930, Figure 1.
  • the size of this punch feed depends on the material, the material thickness, the strength of the material and other parameters.
  • the punch feed cannot be avoided because it is caused by production.
  • the punch feed reduces the shape accuracy of the stamped parts.
  • the function of the stamped parts in the installed state is not guaranteed as a result of this stamping.
  • an additional machining operation e.g. B. grinding, necessary.
  • a layer of material is removed in the thickness of the punch feed.
  • the initial thickness of the sheet metal strip must be made larger by this grinding. This means high material consumption and also high labor costs for the additional grinding process.
  • the object of the invention is to provide a follow-up method which delivers stamped parts with an almost disappearing punch feed.
  • an embossing in the depth of a fraction of the punched strip thickness with an outer contour is somewhat larger than the outer contour of the stamped part in an embossing step preceding the stamped cutout and that the punch feed created during the embossing step is made to flow in the punch cutout, so that a cutting surface with straight profile lines is obtained.
  • the invention differs from the prior art in that in an additional stamping step with an oversize, a punched feed is intentionally generated. However, this punch feed is deformed in the punch cutout, so that a punched part with straight cutting lines is obtained which is free of punch feed. There is no post-processing.
  • the additional embossing step fits easily into the subsequent processing, without the need for an additional step.
  • the method of the invention is applicable to annular, disc-shaped or profiled stamped parts.
  • a particularly good cut surface in the punching cut is obtained in that the depth of the embossing is 10 to 50% of the thickness of the punched strip.
  • the quality of the cut surface can be further improved in that the depth of the embossing is 20 to 30% of the punched strip thickness.
  • the invention further proposes a follow-up tool for stamped parts with several stations, such as forming stations, catching station and cutting station, which comprises a stamping die corresponding to the outer contour of the stamped part and a corresponding die.
  • stations such as forming stations, catching station and cutting station
  • stamping die corresponding to the outer contour of the stamped part and a corresponding die.
  • embossing station is provided in front of the cutting station, the embossing stamp and embossing die of which has an outer contour slightly larger than the outer contour of the stamped part and that the depth of impression of the embossing stamp makes up a fraction of the stamped strip thickness.
  • This follow-on tool allows the production of stamped parts without punching.
  • An existing follow-up tool can easily be converted according to the teaching of the invention.
  • the transverse dimensions of the stamping die are up to 10% larger than the transverse dimensions of the stamped part.
  • a follow-up tool for producing annular disks from a punched strip 3 is shown.
  • the punching strip 3 runs between the lower tool 1 and the upper tool 2.
  • the 1st station is a punching station with a punch 4 and a die 5 for forming a hole 9.
  • a catch pin 6 can be seen, which is used to align the punched strip 3 in register.
  • an embossing stamp 7 can be seen which forms an internal countersink 8 of the hole 9.
  • a fourth station with an embossing stamp 10 and an embossing die 21 shows the essence of the invention.
  • the outer diameter of the stamp 10 is up to 10%, in particular up to 5% larger than the outer diameter of the finished stamped part 22.
  • the stamp 10 produces an embossed impression according to FIGS. 1 and 2 in the depth of a fraction of the stamped strip thickness.
  • the embossing impression is 10 to 50%, in particular 20 to 30% of the punched strip thickness.
  • 2 clearly shows the embossing step 11 on the side of the embossing stamp and the punch feed 12 on the opposite side of the punched strip 3.
  • the dashed lines 23 indicate the nominal diameter of the finished stamped part.
  • the opposite inner countersink 16 of the hole 9 is formed by means of a lower die 13, a holder 14 and a core 15.
  • the last station there is also a catch pin 19 and also a punch 17 which cooperates with a die 18.
  • the outer diameter of the punch 17 corresponds to the finished diameter of the stamped part 22. It can be seen that the outer edge and the outer edge of the embossing stage 11 remain.
  • the punch feed 12 on the opposite side is made to flow when cut out and deformed into a cylindrical cutting surface with smooth and straight cutting lines, as can be clearly seen from FIG. 3.
  • the stamped part 22 is ejected in the direction of the arrow.
  • FIG. 3 The outer surface of the finished stamped part according to FIG. 3 is exactly one cylinder surface. A punch feed does not occur to any appreciable extent on.
  • FIG. 4 shows a stamped part 22 which is produced by a conventional follow-up method. One recognizes the clear punch feed 20, which in many cases requires a post-treatment to make the punch part fully usable.
  • annular disc The production of an annular disc is shown above.
  • the invention can also be used in the production of solid panes and molded parts of any profiling. In the subsequent process, of course, other usual intermediate steps for deformation can be carried out. A follow-up tool can still be retrofitted so that the method according to the invention can be carried out.

Abstract

A progressive method for the production of punched parts in a plurality of steps, such as shaping steps, catching step and punching out. In punching out, the punched part is cut out by a punch in conjunction with a die in accordance with the outline of the punched part. The technical problem is to provide a progressive method which supplies stamped parts with virtually negligible drawing in. In a stamping step before punching out, an impression is made to a depth which is a fraction of the thickness of the strip to be punched, with an outline somewhat larger than the outline of the punched part, and the drawn-in portion formed during the stamping step is caused to flow in the punching out step, with the result that a sheared edge with straight outlines is obtained. A progressive tool comprises a stamping punch with larger cross-sectional dimensions than the punched part. <IMAGE>

Description

Die Erfindung betrifft ein Folgeverfahren zur Herstellung von Stanzteilen in mehreren Schritten, wie Formschritten, Fangschritt und Stanzausschnitt, wobei beim Stanzausschnitt das Stanzteil von einem Stanzstempel entsprechend der Außenkontur des Stanzteils in Zusammen­wirken mit einer Matrize ausgeschnitten wird.The invention relates to a follow-up process for the production of stamped parts in several steps, such as shaping steps, catching step and punch cutout, the punched part being cut out by a punch in accordance with the outer contour of the punched part in cooperation with a die.

Beim Stanzausschnitt entsteht immer ein Stanzeinzug, vergleiche DIN 6930, Bild 1. Dieser Stanzeinzug ist in seiner Größe vom Werk­stoff, von der Werkstoffdicke, von der Festigkeit des Werkstoffs und von anderen Parametern abhängig. Der Stanzeinzug läßt sich nicht ver­meiden, da er fertigungsbedingt entsteht.The punch cut-out always creates a punch feed, see DIN 6930, Figure 1. The size of this punch feed depends on the material, the material thickness, the strength of the material and other parameters. The punch feed cannot be avoided because it is caused by production.

Der Stanzeinzug mindert jedoch die Formgenauigkeit der Stanztei­le. In vielen Fällen ist infolge dieses Stanzeinzugs die Funktion der Stanzteile im Einbauzustand nicht gewährleistet. Infolgedessen ist ein zusätzlicher spanabhebender Arbeitsgang, z. B. ein Schleifen, not­endig. Dabei wird eine Werkstoffschicht in der Dicke des Stanzeinzugs abgetragen. Infolgedessen muß die Ausgangsdicke des Blechstreifens um diesen Abschliff größer bemessen werden. Dieses bedeutet einen hohen Werkstoffverbrauch und außerdem hohe Arbeitskosten für den zusätzli­chen Schleifvorgang.The punch feed, however, reduces the shape accuracy of the stamped parts. In many cases, the function of the stamped parts in the installed state is not guaranteed as a result of this stamping. As a result, an additional machining operation, e.g. B. grinding, necessary. A layer of material is removed in the thickness of the punch feed. As a result, the initial thickness of the sheet metal strip must be made larger by this grinding. This means high material consumption and also high labor costs for the additional grinding process.

Aufgabe der Erfindung ist die Bereitstellung eines Folgeverfah­rens, das Stanzteile mit nahezu verschwindendem Stanzeinzug liefert.The object of the invention is to provide a follow-up method which delivers stamped parts with an almost disappearing punch feed.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß in einem dem Stanzausschnitt vorgeschalteten Prägeschritt eine Einprä­gung in der Tiefe eines Bruchteils der Stanzstreifendicke mit einer Außenkontur etwas größer als die Außenkontur des Stanzteils erfolgt und daß der beim Prägeschritt entstehende Stanzeinzug im Stanzaus­schnitt zum Fließen gebracht wird, so daß man eine Schnittfläche mit geraden Profillinien erhält.This object is achieved according to the invention in that an embossing in the depth of a fraction of the punched strip thickness with an outer contour is somewhat larger than the outer contour of the stamped part in an embossing step preceding the stamped cutout and that the punch feed created during the embossing step is made to flow in the punch cutout, so that a cutting surface with straight profile lines is obtained.

Die Erfindung unterscheidet sich insofern vom Stand der Technik, als in einem zusätzlichen Prägeschritt mit Übermaß ein Stanzeinzug ab­sichtlich erzeugt wird. Dieser Stanzeinzug wird jedoch im Stanzaus­schnitt verformt, so daß man ein Stanzteil mit geradlinig verlaufen­den Schneidlinien erhält, das frei von Stanzeinzug ist. Eine Nachbe­arbeitung entfällt. Der zusätzliche Prägeschritt fügt sich sich zwang­los in die Folgebearbeitung ein, ohne daß hierfür ein zusätzlicher Ar­beitsgang notwendig wäre. Das Verfahren der Erfindung ist bei ringför­migen, scheibenförmigen oder profilierten Stanzteilen anwendbar.The invention differs from the prior art in that in an additional stamping step with an oversize, a punched feed is intentionally generated. However, this punch feed is deformed in the punch cutout, so that a punched part with straight cutting lines is obtained which is free of punch feed. There is no post-processing. The additional embossing step fits easily into the subsequent processing, without the need for an additional step. The method of the invention is applicable to annular, disc-shaped or profiled stamped parts.

Eine besonders gute Schnittfläche beim Stanzausschnitt erhält man dadurch, daß die Tiefe der Einprägung 10 bis 50 % der Stanzstrei­fendicke beträgt.A particularly good cut surface in the punching cut is obtained in that the depth of the embossing is 10 to 50% of the thickness of the punched strip.

Die Güte der Schnittfläche läßt sich dadurch weiter verbessern, daß die Tiefe der Einprägung 20 bis 30 % der Stanzstreifendicke beträgt.The quality of the cut surface can be further improved in that the depth of the embossing is 20 to 30% of the punched strip thickness.

Die Erfindung schlägt weiter ein Folgewerkzeug für Stanzteile mit mehreren Stationen wie Formstationen, Fangstation und Ausschnitt­station, die einen Stanzstempel entsprechend der Außenkontur des Stanzteils und eine entsprechende Matrize umfaßt. Dieses ist dadurch gekennzeichnet, daß vor der Ausschnittstation eine Prägestation vorge­sehen ist, deren Prägestempel und Prägematrize eine Außenkontur etwas größer als die Außenkontur des Stanzteils aufweist und daß die Ein­drucktiefe des Prägestempels einen Bruchteil der Stanzstreifendicke ausmacht.The invention further proposes a follow-up tool for stamped parts with several stations, such as forming stations, catching station and cutting station, which comprises a stamping die corresponding to the outer contour of the stamped part and a corresponding die. This is characterized in that an embossing station is provided in front of the cutting station, the embossing stamp and embossing die of which has an outer contour slightly larger than the outer contour of the stamped part and that the depth of impression of the embossing stamp makes up a fraction of the stamped strip thickness.

Dieses Folgewerkzeug erlaubt die Herstellung von Stanzteilen ohne Stanzeinzug. Ein bereits vorhandenes Folgewerkzeug läßt sich ohne weiteres nach der Lehre der Erfindung umrüsten.This follow-on tool allows the production of stamped parts without punching. An existing follow-up tool can easily be converted according to the teaching of the invention.

Zur Unterdrückung des Stanzeinzugs erweist es sich als besonders günstig, daß die Querabmessungen des Prägestempels bis zu 10 % größer als die Querabmessungen des Stanzteils sind.To suppress the punching-in, it proves to be particularly favorable that the transverse dimensions of the stamping die are up to 10% larger than the transverse dimensions of the stamped part.

Bevorzugte Werte erhält man dadurch, daß die Querabmessungen des Prägestempels bis zu 5 % größer als die Querabmessungen des Stanz­teils sind.Preferred values are obtained in that the transverse dimensions of the stamp are up to 5% larger than the transverse dimensions of the stamped part.

Das Folgeverfahren nach der Erfindung wird in der anliegenden Zeichnung erläutert, in der darstellen:

  • Fig. 1 einen Längsschnitt durch ein Folgewerkzeug,
  • Fig. 2 einen Schnitt durch den Stanzstreifen,
  • Fig. 3 ein ausgeschnittenes Stanzteil im Schnitt,
  • Fig. 4 zum Vergleich ein herkömmlichers Stanzteil und
  • Fig. 5 eine Draufsicht zu Fig. 2.
The following method according to the invention is explained in the accompanying drawing, in which:
  • 1 shows a longitudinal section through a follow-up tool,
  • 2 shows a section through the punched strip,
  • 3 is a cut stamped part in section,
  • Fig. 4 for comparison a conventional stamped part and
  • 5 is a top view of FIG. 2.

In den Zeichnungen ist ein Folgewerkzeug zur Herstellung ringför­miger Scheiben aus einem Stanzstreifen 3 dargestellt. Man erkennt ein Unterwerkzeug 1 mit Matrizen und ein Oberwerkzeug 2 mit verschiedenen Formstempeln und Stanzstempeln. Zwischen dem Unterwerkzeug 1 und dem Oberwerkzeug 2 läuft der Stanzstreifen 3 durch.In the drawings, a follow-up tool for producing annular disks from a punched strip 3 is shown. One recognizes a lower tool 1 with dies and an upper tool 2 with different shaped stamps and punching stamps. The punching strip 3 runs between the lower tool 1 and the upper tool 2.

Die 1. Station ist eine Lochstation mit einem Lochstempel 4 und einer Lochmatrize 5 zur Formung eines Loches 9. In der 2. Station erkennt man einen Fangstift 6, der zum registergerechten Ausrichten des Stanzstreifens 3 dient. In einer 3. Station erkennt man einen Prägestempel 7, der eine Innenansenkung 8 des Loches 9 formt.The 1st station is a punching station with a punch 4 and a die 5 for forming a hole 9. In the 2nd station, a catch pin 6 can be seen, which is used to align the punched strip 3 in register. In a third station, an embossing stamp 7 can be seen which forms an internal countersink 8 of the hole 9.

Eine 4. Station mit einem Prägestempel 10 und einer Prägematrize 21 zeigt den Kern der Erfindung. Der Außendurchmesser des Prägestem­pels 10 ist bis zu 10 %, insbesondere bis zu 5 % größer als der Außen­durchmesser des fertigen Stanzteils 22. Der Prägestempel 10 erzeugt nach den Fig. 1 und 2 einen Prägeeindruck in der Tiefe eines Bruch­teils der Stanzstreifendicke. Der Prägeeindruck beträgt 10 bis 50 %, insbesondere 20 bis 30 % der Stanzstreifendicke. Man erkennt in Fig. 2 deutlich die Prägestufe 11 auf der Seite des Prägestempels und den Stanzeinzug 12 auf der gegenüberliegenden Seite des Stanzstreifens 3. Die gestrichelten Linien 23 geben den Solldurchmesser des fertigen Stanzteils an. In einer weiteren Formstation wird mittels eines Unter­gesenks 13, eines Halters 14 und eines Kerns 15 die gegenüberliegende Innenansenkung 16 des Lochs 9 geformt.A fourth station with an embossing stamp 10 and an embossing die 21 shows the essence of the invention. The outer diameter of the stamp 10 is up to 10%, in particular up to 5% larger than the outer diameter of the finished stamped part 22. The stamp 10 produces an embossed impression according to FIGS. 1 and 2 in the depth of a fraction of the stamped strip thickness. The embossing impression is 10 to 50%, in particular 20 to 30% of the punched strip thickness. 2 clearly shows the embossing step 11 on the side of the embossing stamp and the punch feed 12 on the opposite side of the punched strip 3. The dashed lines 23 indicate the nominal diameter of the finished stamped part. In a further molding station, the opposite inner countersink 16 of the hole 9 is formed by means of a lower die 13, a holder 14 and a core 15.

In der letzten Station befinden sich ebenfalls ein Fangstift 19 und ferner ein Stanzstempel 17, der mit einer Matrize 18 zusammen­wirkt. Der Außendurchmesser des Stanzstempels 17 stimmt mit dem Fer­tigdurchmesser des Stanzteils 22 überein. Man erkennt, daß die Außen­kante und der Außenrand der Prägestufe 11 stehen bleiben. Der Stanz­einzug 12 an der gegenüberliegenden Seite wird beim Ausschnitt zum Fließen gebracht und in eine zylindrische Schnittfläche mit glatten und geraden Schnittlinien verformt, wie man aus Fig. 3 deutlich er­kennt. Im Zuge des Stanzschritts wird das Stanzteil 22 in Pfeilrich­tung ausgeworfen.In the last station there is also a catch pin 19 and also a punch 17 which cooperates with a die 18. The outer diameter of the punch 17 corresponds to the finished diameter of the stamped part 22. It can be seen that the outer edge and the outer edge of the embossing stage 11 remain. The punch feed 12 on the opposite side is made to flow when cut out and deformed into a cylindrical cutting surface with smooth and straight cutting lines, as can be clearly seen from FIG. 3. In the course of the stamping step, the stamped part 22 is ejected in the direction of the arrow.

Die Außenfläche des fertigen Stanzteils nach Fig. 3 ist genau eine Zylinderfläche. Ein Stanzeinzug tritt nicht in merklichem Umfang auf. Im Vergleich dazu zeigt Fig. 4 ein Stanzteil 22, das nach einem herkömmlichen Folgeverfahren hergestellt ist. Man erkennt den deut­lichen Stanzeinzug 20, der in vielen Fällen eine spanabhebende Nachbe­handlung erforderlich macht, um das Stanzteil voll gebrauchsfähig zu machen.The outer surface of the finished stamped part according to FIG. 3 is exactly one cylinder surface. A punch feed does not occur to any appreciable extent on. In comparison, FIG. 4 shows a stamped part 22 which is produced by a conventional follow-up method. One recognizes the clear punch feed 20, which in many cases requires a post-treatment to make the punch part fully usable.

Im Vorigen ist die Herstellung einer Ringscheibe dargestellt. Die Erfindung ist auch bei der Herstellung von Vollscheiben und Form­teilen beliebiger Profilierung anwendbar. Im Folgeverfahren können selbstverständlich weitere übliche Zwischenschritte zur Verformung durchgeführt werden. Noch nachträglich läßt sich ein Folgewerkzeug so umbauen, daß das Verfahren nach der Erfindung durchgeführt werden kann.The production of an annular disc is shown above. The invention can also be used in the production of solid panes and molded parts of any profiling. In the subsequent process, of course, other usual intermediate steps for deformation can be carried out. A follow-up tool can still be retrofitted so that the method according to the invention can be carried out.

Claims (6)

1. Folgeverfahren zur Herstellung von Stanzteilen in mehreren Schritten, wie Formschritten, Fangschritt und Stanzausschnitt, wobei beim Stanzausschnitt das Stanzteil von einem Stanzstempel entspre­chend der Außenkontur des Stanzteils in Zusammenwirken mit einer Ma­trize ausgeschnitten wird, dadurch gekennzeichnet, daß in einem dem Stanzausschnitt vorgeschalteten Prägeschritt eine Einprägung in der Tiefe eines Bruchteils der Stanzstreifendicke mit einer Außenkontur etwas größer als die Außenkontur des Stanzteils erfolgt und daß der beim Prägeschritt entstehende Stanzeinzug im Stanzausschnitt zum Flie­ßen gebracht wird, so daß man eine Schnittfläche mit geraden Profilli­nien erhält.1. Follow-up process for the production of stamped parts in several steps, such as shaping steps, catching step and punch cut-out, the punched part being cut out from a punch in accordance with the outer contour of the punched part in cooperation with a die, characterized in that an embossing step preceding the punched cut-out is performed in the stamped cut-out Embossing in the depth of a fraction of the punched strip thickness with an outer contour slightly larger than the outer contour of the stamped part and that the punching infeed resulting from the embossing step is caused to flow in the punched cut-out, so that a cut surface with straight profile lines is obtained. 2. Folgeverfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Tiefe der Einprägung 10 bis 50 % der Stanzstreifendicke beträgt.2. Follow-up method according to claim 1, characterized in that the depth of the embossing is 10 to 50% of the punched strip thickness. 3. Folgeverfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Tiefe der Einprägung 20 bis 30 der Stanzstreifendicke beträgt.3. Follow-up method according to claim 2, characterized in that the depth of the impression is 20 to 30 of the punched strip thickness. 4. Folgewerkzeug für Stanzteile mit mehreren Stationen wie Form­stationen, Fangstation und Ausschnittstation, die einen Stanzstempel entsprechend der Außenkontur des Stanzteils und eine entsprechende Ma­trize umfaßt, dadurch gekennzeichnet, daß vor der Ausschnittstation eine Prägestation vorgesehen ist, deren Prägestempel (10) und Prägema­trize (21) eine Außenkontur etwas größer als die Außenkontur des Stanzteils (22) aufweist und daß die Eindrucktiefe des Prägestempels (10) einen Bruchteil der Stanzstreifendicke ausmacht.4. Follow-up tool for stamped parts with several stations such as forming stations, catching station and cutting station, which comprises a stamping die corresponding to the outer contour of the stamped part and a corresponding die, characterized in that an embossing station is provided in front of the cutting station, the stamping die (10) and embossing die (21 ) has an outer contour slightly larger than the outer contour of the stamped part (22) and that the impression depth of the embossing stamp (10) makes up a fraction of the stamped strip thickness. 5. Folgewerkzeug nach Anspruch 4, dadurch gekennzeichnet, daß die Querabmessungen des Prägestempels (10) bis zu 10 % größer als die Querabmessungen des Stanzteils (22) sind.5. Follower according to claim 4, characterized in that the transverse dimensions of the die (10) are up to 10% larger than the transverse dimensions of the stamped part (22). 6. Folgewerkzeug nach Anspruch 5, dadurch gekennzeichnet, daß die Querabmessungen des Prägestempels (10) bis zu 5 % größer als die Querabmessungen des Stanzteils (22) sind.6. Follow-up tool according to claim 5, characterized in that the transverse dimensions of the die (10) are up to 5% larger than the transverse dimensions of the stamped part (22).
EP19890100405 1988-01-27 1989-01-11 Progressive method and die for punched parts Expired - Lifetime EP0325947B1 (en)

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DE3802247 1988-01-27
DE19883802247 DE3802247C1 (en) 1988-01-27 1988-01-27

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EP0325947A3 EP0325947A3 (en) 1990-09-05
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DE102012103167A1 (en) 2012-04-12 2013-10-17 BINDER-tecsys Kontakte GmbH Method for punching, particularly for metallic workpieces, involves making prenotch of workpiece along projected shearing edge, where pre-notched workpiece is sheared by cutting element of cutting device along prenotch
WO2015185852A1 (en) 2014-06-02 2015-12-10 Centre Technique Des Industries Mecaniques Method and facility for progressively transforming a strip of metal material
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CH711646A1 (en) * 2015-10-14 2017-04-28 Hatebur Umformmaschinen Ag Method and device for producing an annular shaped part.
CN112207202B (en) * 2020-10-20 2022-08-19 东风汽车零部件(集团)有限公司通用铸锻分公司 Upsetting-extruding forming method for conical check ring

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US4477537A (en) * 1982-09-23 1984-10-16 Blase Tool And Manufacturing Co., Inc. Method for producing burr-free blanks and the blanks produced thereby
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AT502173B1 (en) * 2004-03-12 2007-02-15 Gassner Ges M B H & Co Kg Process to perforate sheet metal panel by initial presentation of cutter to one side followed by action of press in reverse direction
US7308814B2 (en) 2005-10-13 2007-12-18 Gassner Ges.M.B.H. & Co Kg Method for perforating a sheet
DE102012103167A1 (en) 2012-04-12 2013-10-17 BINDER-tecsys Kontakte GmbH Method for punching, particularly for metallic workpieces, involves making prenotch of workpiece along projected shearing edge, where pre-notched workpiece is sheared by cutting element of cutting device along prenotch
DE102012103167B4 (en) 2012-04-12 2018-08-02 BINDER tecsys GmbH Method and device for reducing a puncture
WO2015185852A1 (en) 2014-06-02 2015-12-10 Centre Technique Des Industries Mecaniques Method and facility for progressively transforming a strip of metal material
DE102016107300A1 (en) * 2016-04-20 2017-10-26 Elringklinger Ag Method for producing an intermediate plate mountable between housing parts of a control for pressure-medium-operated consumers and such an intermediate plate
FR3084602A1 (en) * 2018-07-31 2020-02-07 Precitechnique Dauphine TOOLS OF A PRESSING MACHINE AND A METHOD OF STAMPING IMPLEMENTING SUCH TOOLS

Also Published As

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DE3802247C1 (en) 1989-05-18
ES2032056T3 (en) 1993-01-01
EP0325947A3 (en) 1990-09-05
EP0325947B1 (en) 1992-05-20

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