EP0017920A1 - Cutting tool for cutting out a cut of sheet metal - Google Patents

Cutting tool for cutting out a cut of sheet metal Download PDF

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Publication number
EP0017920A1
EP0017920A1 EP80101931A EP80101931A EP0017920A1 EP 0017920 A1 EP0017920 A1 EP 0017920A1 EP 80101931 A EP80101931 A EP 80101931A EP 80101931 A EP80101931 A EP 80101931A EP 0017920 A1 EP0017920 A1 EP 0017920A1
Authority
EP
European Patent Office
Prior art keywords
cutting
sheet metal
sheet
die
cutting die
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
EP80101931A
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German (de)
French (fr)
Other versions
EP0017920B1 (en
Inventor
Jan Czudek
Stefan Gadzinski
Przemyslaw Wasilewski
Ryszard Czarnecki
Andrzej Konior
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.)
Politechnika Lodzka
Original Assignee
Politechnika Lodzka
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 Politechnika Lodzka filed Critical Politechnika Lodzka
Priority to AT80101931T priority Critical patent/ATE3377T1/en
Publication of EP0017920A1 publication Critical patent/EP0017920A1/en
Application granted granted Critical
Publication of EP0017920B1 publication Critical patent/EP0017920B1/en
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

Definitions

  • the invention relates to a cutting tool for cutting a sheet metal blank for the subsequent pressing of a cylindrical workpiece, consisting of a die and a punch.
  • punching tools which consist of a cutting die with a round opening and a cylindrical punch.
  • the sheet is fed to the punching tool in the form of a sheet, a strip or a strip. With this, the blanks are produced in a round shape, while the remaining material is waste.
  • Punching tools are known from Polish Patent Nos. 93 188 and 63 723, with which square blanks can be produced and which comprise a cutting die and a drawing sleeve, the outer profile of which forms the cutting punch and the inner opening of which together with a drawing punch represents the press part.
  • the cylindrical workpieces produced by means of these known punching tools have an inadequate quality, especially in the case of larger diameters, and unacceptable different wall thicknesses, cracks and folds.
  • Punching tools with which round sheet metal blanks and corresponding workpieces are produced, require a large amount of material because there is a relatively large amount of waste.
  • Stamping tools which produce square sheet metal blanks and workpieces from them, require a further operation, which consists in trimming the corners of the blanks, since such corners make the further pressing process more difficult.
  • the diameter of the opening of the cutting die is larger than the width of the sheet metal strip to be cut
  • the cutting die is provided with an insert oriented in the feed direction of the sheet metal strip with a cutting edge, the length of which length corresponds to the secant formed by the longitudinal edge of the sheet metal strip and the opening of the cutting die, the feed stroke of the sheet metal strip corresponds to its width
  • the cylindrical punch has a flattening assigned to the insert of the cutting die.
  • blanks can be produced which have an optimal shape, namely a square with corners cut along an arc line.
  • the blanks produced ensure a process-technically simple and inexpensive pressing process, enable better flow of the material during the pressing, thereby making pressed parts of greater height, uniform wall thickness and good quality, allow the use of a smaller uniform flange pressure and do not require pre-trimming the flange as with square sheet metal blanks.
  • the cutting tool consists of an annular cutting die with an opening whose diameter is greater than the width of the strip 2 to be cut.
  • the die 1 is equipped with an insert 3 consisting of a flat plate, the cutting edge of which is perpendicular to the direction of feed of the strip 2, the opening of the strip Dies limited by 1 secant.
  • the length a of the cutting edge of the insert 3 corresponds to the length of the secant b formed between the longitudinal edge of the strip lying in the cutting tool and the opening of the die 1.
  • the cutting tool has a cylindrical punch 4, the jacket of which on a Side has a flat, which cooperates with the insert 3 of the die 1 when the die 4 is moved into the opening of the die 1.
  • the width of the flattening of the punch 4 corresponds essentially to the length a of the cutting edge of the insert 3 of the die 1.
  • a feed cylinder 5 with a counter cylinder is provided.
  • the feed stroke of the feed cylinder 5 corresponds to the width of the processed strip 2.
  • the material strip 2 is fed to the cutting tool by means of the feed cylinder 5.
  • the blank c shown in FIG. 4 is cut off from the strip 2 in the die 1 by means of the outer profile of the stamp 4.
  • the outer contour of the blank c has a shape approximating a square corresponding to the inner opening of the die 1 with the insert 3.
  • the cutting tool described is used to produce optimally shaped blanks from metal or plastic sheets, which are intended for the subsequent pressing of workpieces on single-acting and / or multi-stage presses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Punching Or Piercing (AREA)

Abstract

1. Cutting tool for cutting out a sheet blank, having a square shape with cut corners for the subsequent pressing of a cylindrical work piece, comprising a cutting die (1) and a plunger (4), characterized in that the width of the sheet strip supplied corresponds to the edge spacing of the sheet blank (c) in that the cutting die (1) is provided on the sheet entry side with a liner (3), the cutting edge of which is aligned perpendicularly to the sheet's direction of motion and the length of which (a) corresponds to the length of the chord (b) formed by the longitudinal edge of the sheet strip (2) and the aperture of the cutting die (1) in the area of the longitudinal edges of the sheet strip (2), and the cylindrically formed plunger (4) has a flat region associated with the liner (3) of the cutting die (1).

Description

Die Erfindung betrifft ein Schnittwerkzeug zum Ausschneiden eines Blechzuschnittes für das nachfolgende Pressen eines zylindrischen Werkstückes, bestehend aus einem Gesenk und einem Stempel.The invention relates to a cutting tool for cutting a sheet metal blank for the subsequent pressing of a cylindrical workpiece, consisting of a die and a punch.

Zum Ausschneiden von Blechzuschnitten, die als Rohling zum anschließenden Pressen eines Werkstückes dienen, werden Stanzwerkzeuge eingesetzt, die aus einem Schneidgesenk mit einer runden öffnung und einem zylindrischen Stempel bestehen. Das Blech wird in Form eines Bogens, eines Bands oder eines Streifens dem Stanzwerkzeug zugeführt. Mit diesem werden die Zuschnitte in runder Form erzeugt, während der verbleibende Werkstoff Abfall ist.For cutting sheet metal blanks, which serve as a blank for the subsequent pressing of a workpiece, punching tools are used which consist of a cutting die with a round opening and a cylindrical punch. The sheet is fed to the punching tool in the form of a sheet, a strip or a strip. With this, the blanks are produced in a round shape, while the remaining material is waste.

Aus den polnischen Patentschriften Nr. 93 188 und 63 723 sind Stanzwerkzeuge bekannt, mit denen quadratische Zuschnitte erzeugt werden können und die ein Schneidgesenk und eine Ziehhülse umfassen, deren Außenprofil den Schneidstempel bildet und deren Innenöffnung zusammen mit einem Ziehstempel den Pressenteil darstellt.Punching tools are known from Polish Patent Nos. 93 188 and 63 723, with which square blanks can be produced and which comprise a cutting die and a drawing sleeve, the outer profile of which forms the cutting punch and the inner opening of which together with a drawing punch represents the press part.

Die mittels dieser bekannten Stanzwerkzeuge hergestellten zylindrischen Werkstücke weisen insbesondere bei größeren Durchmessern eine ungenügende Qualität sowie nicht akzeptable unterschiedliche Wandstärken, Anrisse und Falten auf. Stanzwerkzeuge, mit welchen runde Blechzuschnitte und entsprechende Werkstücke hergestellt werden, erfordern einen großen Werkstoffeinsatz, weil relativ viel Verschnitt anfällt. Stanzwerkzeuge, welche quadratische Blechzuschnitte und Werkstücke aus diesen erzeugen, bedingen einen weiteren Arbeitsgang, der darin besteht, die Ecken der Zuschnitte zu beschneiden, da derartige Ecken den weiteren Preßvorgang erschweren.The cylindrical workpieces produced by means of these known punching tools have an inadequate quality, especially in the case of larger diameters, and unacceptable different wall thicknesses, cracks and folds. Punching tools, with which round sheet metal blanks and corresponding workpieces are produced, require a large amount of material because there is a relatively large amount of waste. Stamping tools, which produce square sheet metal blanks and workpieces from them, require a further operation, which consists in trimming the corners of the blanks, since such corners make the further pressing process more difficult.

Demgegenüber ist es Aufgabe der Erfindung, ein Schnittwerkzeug der vorausgesetzten Art zu schaffen, das einen einfachen Aufbau besitzt und mit dem mit möglichst wenig Verschnitt Zuschnitte mit einer Form erzeugt werden können, die für die weitere Bearbeitungsfolge günstig ist.In contrast, it is an object of the invention to provide a cutting tool of the required type, which has a simple structure and with which cuts can be produced with as little waste as possible with a shape which is favorable for the further processing sequence.

Diese Aufgabe wird bei einem Schnittwerkzeug der vorausgesetzten Art dadurch gelöst, daß der Durchmesser der öffnung des Schneidgesenks'größer ist als die Breite des zu beschneidenden Blechstreifens, das Schneidgesenk mit einer in Zuführrichtung des Blechstreifens ausgerichteten Einlage mit einer Schnittkante versehen ist, deren Länge der Länge der durch die Längskante des Blechstreifens und der öffnung des Schneidgesenks gebildeten Sekante entspricht, der Zuführhub des Blechstreifens dessen Breite entspricht, und der zylindrische Stempel eine der Einlage des Schneidgesenks zugeordnete Abflachung aufweist.This object is achieved in a cutting tool of the type described above in that the diameter of the opening of the cutting die is larger than the width of the sheet metal strip to be cut, and the cutting die is provided with an insert oriented in the feed direction of the sheet metal strip with a cutting edge, the length of which length corresponds to the secant formed by the longitudinal edge of the sheet metal strip and the opening of the cutting die, the feed stroke of the sheet metal strip corresponds to its width, and the cylindrical punch has a flattening assigned to the insert of the cutting die.

Mit dem erfindungsgemäßen Schnittwerkzeug können Zuschnitte hergestellt werden, die eine optimale Form aufweisen, nämlich einem Quadrat mit längs einer Bogenlinie abgeschnittenen Ecken entsprechen. Die erzeugten Zuschnitte gewährleisten einen verfahrenstechnisch einfachen und günstigen Preßvorgang, ermöglichen ein besseres Fließen des Werkstoffes beim Pressen, wodurch Preßteile mit größerer Höhe, gleichmäßiger Wanddicke und guter Qualität erzeugt werden, erlauben die Anwendung eines kleineren einheitlichen Flanschdrucks und erfordern nicht ein Vorbeschneiden des Flansches wie bei quadratischen Blechzuschnitten.With the cutting tool according to the invention, blanks can be produced which have an optimal shape, namely a square with corners cut along an arc line. The blanks produced ensure a process-technically simple and inexpensive pressing process, enable better flow of the material during the pressing, thereby making pressed parts of greater height, uniform wall thickness and good quality, allow the use of a smaller uniform flange pressure and do not require pre-trimming the flange as with square sheet metal blanks.

Die Erfindung wird nachstehend anhand eines Ausführrungsbeispiels näher erläutert. In der zugehörigen Zeichnung zeigt

  • Fig. 1 einen Achsschnitt des Schnittwerkzeugs,
  • Fig. 2 den Schnitt II-II durch das Schnittwerkzeug gemäß Fig. 1,
  • Fig. 3 den Schnitt I-I durch das Schnittwerkzeug nach Fig. 1, und
  • Fig. 4 die Draufsicht auf einen Blechzuschnitt.
The invention is explained in more detail below using an exemplary embodiment. In the accompanying drawing shows
  • 1 is an axial section of the cutting tool,
  • 2 shows the section II-II through the cutting tool according to FIG. 1,
  • Fig. 3 shows the section II through the cutting tool of FIG. 1, and
  • Fig. 4 is a plan view of a sheet metal blank.

Das Schnittwerkzeug besteht aus einem ringförmigen Schneidgesenk mit einer öffnung, deren Durchmesser größer ist als die Breite des zu beschneidenden Streifens 2. Das Gesenk 1 ist mit einer aus einer flachen Platte bestehenden Einlage 3 ausgestattet, deren zur Zuführrichtung des Streifens 2 senkrechte Schnittkante die öffnung des Gesenks 1 sekantenartig begrenzt. Die Länge a der Schnittkante der Einlage 3 entspricht der Länge der zwischen der Längskante des im Schnittwerkzeug liegenden Streifens und der öffnung des Gesenks 1 gebildeten Sekante b.The cutting tool consists of an annular cutting die with an opening whose diameter is greater than the width of the strip 2 to be cut. The die 1 is equipped with an insert 3 consisting of a flat plate, the cutting edge of which is perpendicular to the direction of feed of the strip 2, the opening of the strip Dies limited by 1 secant. The length a of the cutting edge of the insert 3 corresponds to the length of the secant b formed between the longitudinal edge of the strip lying in the cutting tool and the opening of the die 1.

Darüber hinaus weist das Schnittwerkzeug einen zylindrischen Stempel 4 auf, dessen Mantel auf einer Seite eine Abflachung besitzt, die beim Einfahren des Stempels 4 in die öffnung des Gesenks 1 mit der Einlage 3 des Gesenks 1 zusammenwirkt. Die Breite der Abflachung des Stempels 4 entspricht im wesentlichen der Länge a der Schnittkante der Einlage 3 des Gesenks 1.In addition, the cutting tool has a cylindrical punch 4, the jacket of which on a Side has a flat, which cooperates with the insert 3 of the die 1 when the die 4 is moved into the opening of the die 1. The width of the flattening of the punch 4 corresponds essentially to the length a of the cutting edge of the insert 3 of the die 1.

Schließlich ist ein Zuführzylinder 5 mit einem Gegenzylinder vorgesehen. Der Förderhub des Zuführzylinders 5 entspricht der Breite des verarbeiteten Streifens 2.Finally, a feed cylinder 5 with a counter cylinder is provided. The feed stroke of the feed cylinder 5 corresponds to the width of the processed strip 2.

Der Werkstoff-Streifen 2 wird mittels des Zuführzylinders 5 dem Schnittwerkzeug zugeführt. Mittels des Außenprofils des Stempels 4 wird in dem Gesenk 1 von dem Streifen 2 der in Fig. 4 dargestellte Zuschnitt c abgeschnitten. Die Außenkontur des Zuschnittes c weist eine der Innenöffnung des Gesenks 1 mit der Einlage 3 entsprechende einem Quadrat angenäherte Form auf.The material strip 2 is fed to the cutting tool by means of the feed cylinder 5. The blank c shown in FIG. 4 is cut off from the strip 2 in the die 1 by means of the outer profile of the stamp 4. The outer contour of the blank c has a shape approximating a square corresponding to the inner opening of the die 1 with the insert 3.

Das geschilderte Schnittwerkzeug findet Verwendung zur Erzeugung von optimal geformten Zuschnitten aus Metall- oder Kunststoffblechen, welche zum nachfolgenden Pressen von Werkstücken auf einfach wirkenden und/oder mehrstufigen Pressen bestimmt sind.The cutting tool described is used to produce optimally shaped blanks from metal or plastic sheets, which are intended for the subsequent pressing of workpieces on single-acting and / or multi-stage presses.

Claims (1)

Schnittwerkzeug zum Ausschneiden eines Blechzuschnittes für das nachfolgende Pressen eines zylindrischen Werkstückes, bestehend aus einem Gesenk und einem Stempel, dadurch gekennzeichnet, daß der Durchmesser der öffnung des Schneidgesenks (1) größer ist als die Breite des zu beschneidenden Blechstreifens (2), das Schneidgesenk (1) mit einer in Zuführrichtung des Blechstreifens (2) ausgerichteten Einlage (3) mit einer Schnittkante versehen ist, deren Länge der Länge der durch die Längskante des Blechstreifens und der Öffnung des Schneidgesenks (1) gebildeten Sekante entspricht, der Zuführhub des Blechstreifens (2) dessen Breite entspricht, und der zylindrische Stempel (4) eine der Einlage (3) des Schneidgesenks (1) zugeordnete Abflachung aufweist.Cutting tool for cutting out a sheet metal blank for the subsequent pressing of a cylindrical workpiece, consisting of a die and a punch, characterized in that the diameter of the opening of the cutting die (1) is larger than the width of the sheet metal strip (2) to be cut, the cutting die ( 1) is provided with an insert (3) aligned in the feed direction of the sheet metal strip (2), the length of which corresponds to the length of the secant formed by the longitudinal edge of the sheet metal strip and the opening of the cutting die (1), the feed stroke of the sheet metal strip (2 ) whose width corresponds, and the cylindrical punch (4) has a flattening assigned to the insert (3) of the cutting die (1).
EP80101931A 1979-04-13 1980-04-10 Cutting tool for cutting out a cut of sheet metal Expired EP0017920B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80101931T ATE3377T1 (en) 1979-04-13 1980-04-10 CUTTING TOOL FOR CUTTING A SHEET METAL BLANK.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL1979214925A PL122194B1 (en) 1979-04-13 1979-04-13 Blanking die
PL214925 1979-04-13

Publications (2)

Publication Number Publication Date
EP0017920A1 true EP0017920A1 (en) 1980-10-29
EP0017920B1 EP0017920B1 (en) 1983-05-18

Family

ID=19995738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101931A Expired EP0017920B1 (en) 1979-04-13 1980-04-10 Cutting tool for cutting out a cut of sheet metal

Country Status (6)

Country Link
EP (1) EP0017920B1 (en)
AT (1) ATE3377T1 (en)
CS (1) CS222173B2 (en)
DD (1) DD150014A5 (en)
DE (1) DE3063261D1 (en)
PL (1) PL122194B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2523641C2 (en) * 2012-08-01 2014-07-20 Открытое акционерное общество "АВТОВАЗ" Low-waste two-row cutting of blanks from strip (versions)
RU2529263C2 (en) * 2012-12-10 2014-09-27 Общество с ограниченной ответственностью "Научно-производственное объединение "Компания "Сивик" Device to straighten wheel rim seats (versions)
RU2529130C2 (en) * 2012-12-04 2014-09-27 Открытое акционерное общество "АВТОВАЗ" Method of low-waste single-row blanking from tape, wide reel or strip
CN109789471A (en) * 2016-09-26 2019-05-21 通快机床两合公司 For cutting and/or forming the tool and lathe and method of the workpiece of plate

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1800531A (en) * 1929-02-13 1931-04-14 American Can Co Method of producing one-piece drawn containers
DE2209927A1 (en) * 1971-03-19 1972-10-05 Lachaussee M Process for the production of metal bodies from moldings
DE2753800A1 (en) * 1976-12-02 1978-06-08 Politechnika Lodzka Slip=on rotary elements stamping on multi-stage press - uses rectangular plate stamping with subsequent removal of corners

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL93188B1 (en) * 1975-06-02 1977-05-30

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1800531A (en) * 1929-02-13 1931-04-14 American Can Co Method of producing one-piece drawn containers
DE2209927A1 (en) * 1971-03-19 1972-10-05 Lachaussee M Process for the production of metal bodies from moldings
DE2753800A1 (en) * 1976-12-02 1978-06-08 Politechnika Lodzka Slip=on rotary elements stamping on multi-stage press - uses rectangular plate stamping with subsequent removal of corners

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2523641C2 (en) * 2012-08-01 2014-07-20 Открытое акционерное общество "АВТОВАЗ" Low-waste two-row cutting of blanks from strip (versions)
RU2529130C2 (en) * 2012-12-04 2014-09-27 Открытое акционерное общество "АВТОВАЗ" Method of low-waste single-row blanking from tape, wide reel or strip
RU2529263C2 (en) * 2012-12-10 2014-09-27 Общество с ограниченной ответственностью "Научно-производственное объединение "Компания "Сивик" Device to straighten wheel rim seats (versions)
CN109789471A (en) * 2016-09-26 2019-05-21 通快机床两合公司 For cutting and/or forming the tool and lathe and method of the workpiece of plate

Also Published As

Publication number Publication date
DD150014A5 (en) 1981-08-12
EP0017920B1 (en) 1983-05-18
PL214925A2 (en) 1980-03-10
PL122194B1 (en) 1982-06-30
DE3063261D1 (en) 1983-07-07
CS222173B2 (en) 1983-05-27
ATE3377T1 (en) 1983-06-15

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