EP0614711A1 - Verfahren und Vorrichtung zum Ziehen von metallischen Rohlingen zur Herstellung sogenannter Tiefziehwerkstücke - Google Patents

Verfahren und Vorrichtung zum Ziehen von metallischen Rohlingen zur Herstellung sogenannter Tiefziehwerkstücke Download PDF

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Publication number
EP0614711A1
EP0614711A1 EP94400481A EP94400481A EP0614711A1 EP 0614711 A1 EP0614711 A1 EP 0614711A1 EP 94400481 A EP94400481 A EP 94400481A EP 94400481 A EP94400481 A EP 94400481A EP 0614711 A1 EP0614711 A1 EP 0614711A1
Authority
EP
European Patent Office
Prior art keywords
blank holder
force
slide
stamping
peripheral
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
EP94400481A
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English (en)
French (fr)
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EP0614711B1 (de
Inventor
Gérard Heurteboust
Jean-François Seconde
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0614711A1 publication Critical patent/EP0614711A1/de
Application granted granted Critical
Publication of EP0614711B1 publication Critical patent/EP0614711B1/de
Anticipated expiration legal-status Critical
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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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04—Blank holders; Mounting means therefor
    • B21D24/06—Mechanically spring-loaded blank holders

Definitions

  • the present invention relates to a method and a device for stamping metal blanks for the production of so-called deep-drawn parts, in particular cans.
  • a matrix is then applied to the metal blank according to a force transmitted vertically by an upper slide and a blank hold-down force is applied simultaneously under the blank holder to the force of the upper slide in order to form the metal blank over a depth called the drawing depth .
  • the invention therefore aims to remedy the aforementioned drawbacks by providing a method and a device for stamping metal blanks, particularly suitable for the production of so-called deep-drawn parts, making it possible to control the stamping operation and simple to enforce.
  • the stamping device comprises the usual constituent elements of a double-acting press and is used for the stamping of metal blanks 1, for example of steel sheets, in order to produce stampings deep and in particular cylindrical cans.
  • This device includes a matrix 2 on which acts a first slide 3 said upper slide of a press and which is intended to apply to the die 2 a drawing force to obtain a stamping.
  • the lower part of the matrix 2 intended to be applied to the metal blank 1 has an imprint 2a of section corresponding to the profile of the finished part to be obtained.
  • the device also comprises, on the one hand, a peripheral blank holder 4 intended to cooperate with the matrix 2 to clamp the peripheral part of the metal blank 1 and, on the other hand, a central punch 5 of profile corresponding to the imprint 2a of matrix 2.
  • the die 2 and the peripheral blank holder 4 are slidably mounted around the punch 5 and this punch 5 is fixed by its lower end in a base 6 of very thick thickness which is itself fixed to the frame, not shown, of the press.
  • the device comprises means 10 for transmitting to the blank holder 4 a retaining force opposite to the drawing force exerted by the first slide 3 on the die 2.
  • These means 10 for transmitting the retaining force to the blank holder are formed by a second slide 11 said lower slide disposed below the base 6 and by several vertical candles 12, for example eight in number, regularly distributed around of the punch 5 and passing through the base 6 in its thickness by cylindrical perforations 13.
  • An end 12a called the bottom of the candles 12 is intended to cooperate with the second slide 11 and an end 12b called the top of the candles 12 is intended to cooperate with the peripheral blank holder 4.
  • the device according to the invention comprises means 15 for transmitting to the blank holder 4 a reduced retaining force between the fifth and half of the retaining force exerted by the lower slide 11 on the peripheral blank holder 4 by means of the candles 12 so as to obtain a first stamping of depth P1 between the fifth and a third of the final depth P of the stamping.
  • These means 15 for transmitting the reduced retaining force to the blank holder are formed by elastic members 16, such as, for example, springs.
  • an elastic member 16 is interposed between the so-called upper end 12b of each candle 12 and the peripheral blank holder 4.
  • Each elastic member 16 is wound on a part of the corresponding candle 12 and is fixed by one of these ends 16a to the peripheral blank holder 4 and by its opposite end 16b to a shoulder 17 formed on said candle 12.
  • a cylindrical housing 18 is arranged under the peripheral blank holder 4 in alignment with each candle 12, in order to receive the upper end 12b of the candle when the elastic member 16 is compressed.
  • the device according to the first embodiment shown in Figs. 1 to 3 works as follows.
  • the metal blank 1 is placed on the peripheral blank holder 4, this metal blank 1 can also rest on the nose of the punch 5.
  • the first slide 3 of the press gradually descends, driving the die 4, which has the effect, at first, of tightening the part peripheral of the metal blank 1, as shown in FIG. 1.
  • the first slide 3 and the die 2 continue to descend, causing the blank holder 4 which slides along the punch 5.
  • the first slide 3 applies to the die 2 a drawing force.
  • the elastic members 16 compress progressively and apply to the blank holder 4 a reduced retaining force opposite to the drawing force applied to the die 2.
  • the punch 5 gradually deforms the central part of the metal blank 1 so as to obtain a first stamped 6 of depth P1 between the fifth and a third of the depth P of the final stamped to be obtained.
  • the die 2 and the blank holder 4 continue to descend to complete the forming of the metal blank 1 to the final depth P of the stamped.
  • the blank holder 4 is in contact with the upper end 12b of the candles 12 while the lower ends 12a act on the second slide 11.
  • the second slide 11 applies to the blank holder 4, by means of the jack stands 12, a retaining force which is greater than the reduced retaining force exerted by the elastic members 16 during the first step , but which is less than the drawing force applied to the die 2.
  • the force exerted on the metal blank 1 is equal to the difference of the forces opposites applied respectively to the matrix 2 and to the peripheral blank holder 4.
  • the candles 12 are integral with the peripheral blank holder 4 and the device comprises a plate 20 interposed between the base 6 and the second slide 11.
  • This plate 20 consists of two elements, respectively 20a and 20b, of substantially equal diameters.
  • the upper element 20a of the plate 20 is secured to the lower ends 12a of the candles 12 and the lower element 20b is secured to the second slide 11.
  • the lower element 20b of this plate 20 comprises, at least one housing 22.
  • the elastic members 16 also constituted by compression springs are interposed between the two elements 20a and 20b forming the plate 20.
  • One end of the elastic members 16 is supported on the underside of the upper member 20a and the other end of the elastic members 16 is supported in the bottom of the corresponding housing 22 of the lower member 20b.
  • the second slide 11 is provided with at least one substantially vertical element 11a forming a stop against the base 6, during the compression of the elastic members 16.
  • This element 11a is for example constituted by a vertical annular wall extending from the peripheral edge of the second slide 11 to the base 6.
  • This annular wall 11a has for example a generally cylindrical shape.
  • the upper element 20a of the plate 20 is in contact with the base 6 and the two elements 20a and 20b are spaced from one another, the annular wall 11a being in abutment against said base 6.
  • the first slide 3 of the press descends progressively, driving the die 4, which has the effect, at first, of clamping the peripheral part of the metal blank 1, as shown in FIG. 4.
  • the first slide 3 and the die 3 continue to descend, driving, on the one hand, the blank holder 4 which slides along the punch 5 and, on the other hand, the upper element 20a of the plate 20 via candles 12.
  • the first slide 3 applies to the die 2 a drawing force.
  • the elastic members 16 gradually compress between the two elements 20a and 20b of the plate 20 and apply to the blank holder 4 a reduced retaining force opposite to the drawing force applied to the die 2.
  • the punch 5 progressively deforms the central part of the metal blank 1 so as to obtain a first stamping of depth P1 between the fifth and a third of the depth P of the final stamping to be obtained.
  • the height of the annular wall 11a is greater than the thickness of the plate 20.
  • the second slide 11 applies to the blank holder, by means of the plate 20 and the candles 12, a retaining force which is greater than the reduced retaining force exerted by the elastic members 16 during the first step, but which is less than the drawing force applied to the die 2.
  • the reduced retaining force applied to the blank holder 4 by the elastic members 16 is between the fifth and half of the retaining force applied by the second slide 11 to said blank holder 4 during the second metal blank forming step 1.
  • the peripheral blank holder 4 consists of two parts 40 and 41 of substantially equal diameter, an upper part 40 in permanent contact by one of its so-called upper faces with the peripheral part of the metal blank 1 and a lower part 41 secured to the upper ends 12b of the candles 12.
  • the lower part 12a of the candles 12 bears on the second slide 11.
  • the two parts 40 and 41 which constitute the peripheral blank holder 4 are interconnected by at least one element 42 serving to limit the spacing maximum between these two parts 40 and 41.
  • the spacer 42 is formed by a vertical pin, one end of which is integral with the upper part 40 of the hold-down 4 and the opposite end of which crosses the lower part 41 of the said hold-down 4 and is provided with a shoulder 42a forming a stop for said lower part 41 of the blank holder 4.
  • the number of pins 42 is for example equal to eight, these pins being regularly distributed between the two parts 40 and 41 of the peripheral blank holder 4.
  • the elastic members 16 are interposed between the two parts 40 and 41 forming said peripheral blank holder 4.
  • Each elastic member 16 constituted for example by a compression spring, is wound around a pin 42 which serves as a guide for said elastic member.
  • each pin 42 makes it possible to retain the upper part 40 of the peripheral blank holder 4 which, under the effect of the force exerted by the elastic members 16, tends to move the metal blank 1 upwards. when the matrix 2 is not yet in contact with said metal blank.
  • the shoulder 42a therefore makes it possible to maintain the elastic members 16 under a determined prestress which obviously depends on the length of the pins 42.
  • the upper part 40 of the peripheral blank holder 4 has, from its edge furthest from the punch 5, a first portion 40a of small height on which the pins 42 are fixed and a second portion 40b of greater height projecting downwards towards the lower part 41 of the peripheral blank holder 4.
  • This portion 40b is arranged at the periphery of punch 5.
  • the first slide 3 of the press descends progressively, driving the die 4, which has the effect, at first, of clamping the peripheral part of the metal blank 1 as shown in FIG. 7.
  • the first slide 3 applies to the die 2 a drawing force.
  • the elastic members 16 are gradually compressed and apply to the upper part 40 of the blank holder 4 a reduced retaining force opposite to the drawing force applied to the die 2.
  • the punch 5 progressively deforms the central part of the metal blank 1 so as to obtain a first stamping of depth P1 between the fifth and a third of the depth P of the final stamping to be obtained.
  • the die 2 continues to descend to complete the forming of the metal blank 1 to the final depth P of the stamped.
  • the second slide 11 applies to the blank holder 4, by means of the jack stands 12, a retaining force which is greater than the reduced retaining force previously exerted by the elastic members 16, but which is less the drawing force applied to the die 2.
  • the reduced retaining force applied to the upper part 40 of the blank holder 4 during the first forming step is between the fifth and half of the retaining force applied to the blank holder 4 by the second slide 11 during the second forming step.
  • the diameters of the metal blank 1 and of the punch 5 are respectively equal to 150 and 82 mm, and the thickness of the metal blank 1 is equal to 0.18 mm.
  • the final depth P of the stamp is for example equal to 45mm.
  • the compression springs 16 used are precompressed to a force of 500 Kg up to approximately 1.5 T, this value being reached when the springs are at the end of compression.
  • one third of the final depth of the stamping must not be exceeded during the first forming step.
  • the retaining force or also called the conventional retaining force is the most suitable for obtaining high drawing latitudes.
  • FIG. 10 illustrates the advantages of the method and the device according to the invention over the state of the art.
  • the abscissa axis represents the ratio ⁇ between the diameter of the metal blank to be formed and the diameter of the punch and the ordinate axis represents the strength of the blank holder in tonnes.
  • a first straight line AB which extends substantially parallel to the abscissa axis and a second straight line BC which extends in the direction of the ordinate axis forming with the straight line AB a angle ⁇ .
  • This diagram also shows in dotted lines, on the one hand, a straight line A ', B' which extends substantially parallel to the axis of the abscissa and which is, over part of its length, coincident with the line AB and, on the other hand, a line B 'C' which extends in the direction of the ordinate axis and which forms with the line A ', B' an angle ⁇ equal to the angle formed by the lines AB and BC.
  • the domain I inscribed inside the contour delimited by the lines AB and BC corresponds to the stamping domain accessible for corresponding values of ⁇ according to the state of the art.
  • ⁇ is equal to 1.83, which is equivalent to a drawing latitude d of the order of 250 Kg.
  • drawing latitude is understood to mean the difference in hold-down pressure allowed between the maximum hold-down force and the minimum hold-down force.
  • the domain II inscribed inside the contour delimited by the lines A'B 'and B'C' corresponds to the stamping domain accessible for corresponding values of ⁇ , with a device according to the present invention.
  • the method according to the present invention advantageously allows the drawing latitude to be increased by up to a value of 3, 25 T.
  • the maximum blank holder force that can be read on the oblique lines BC, B'C 'for a given value of ⁇ , represents the value for which the rupture of the metal blank occurs.
  • the method and the drawing device according to the invention making it possible to increase the suitability of metal blanks for severe stamping operations and more particularly for metal blanks thin.
  • stamping manufacturers can therefore in many cases reduce the initial thickness of the material which they use without this resulting in complex and costly modifications of the production chain.
  • the can thus formed has a more regular thickness than that obtained with conventional stamping methods.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
EP94400481A 1993-03-09 1994-03-07 Verfahren und Vorrichtung zum Ziehen von metallischen Rohlingen zur Herstellung sogenannter Tiefziehwerkstücke Expired - Lifetime EP0614711B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9302712A FR2702401B1 (fr) 1993-03-09 1993-03-09 Procede et dispositif d'emboutissage de flans metalliques pour la realisation de pieces dite a embouti profond.
FR9302712 1993-03-09

Publications (2)

Publication Number Publication Date
EP0614711A1 true EP0614711A1 (de) 1994-09-14
EP0614711B1 EP0614711B1 (de) 1998-06-17

Family

ID=9444796

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94400481A Expired - Lifetime EP0614711B1 (de) 1993-03-09 1994-03-07 Verfahren und Vorrichtung zum Ziehen von metallischen Rohlingen zur Herstellung sogenannter Tiefziehwerkstücke

Country Status (4)

Country Link
EP (1) EP0614711B1 (de)
AT (1) ATE167413T1 (de)
DE (1) DE69411049D1 (de)
FR (1) FR2702401B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150298197A1 (en) * 2012-12-19 2015-10-22 Nippon Steel & Sumitomo Metal Corporation Press-forming tool and method for manufacturing press-formed product
WO2016031297A1 (ja) * 2014-08-26 2016-03-03 本田技研工業株式会社 クッションピン
CN109774108A (zh) * 2019-01-16 2019-05-21 梁格 一种塑料板料压制机
JP2020127964A (ja) * 2019-02-12 2020-08-27 新明工業株式会社 金型装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3133772B1 (fr) * 2022-03-22 2024-02-09 Psa Automobiles Sa ensemble de poussée pour presse d’emboutissage

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0279269A2 (de) * 1987-02-17 1988-08-24 Rasselstein Ag Verfahren zur Herstellung einer Tiefziehdose aus Blech
FR2676667A3 (en) * 1991-05-24 1992-11-27 Sollac Device for the deep-drawing of sheet-metal blanks

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0279269A2 (de) * 1987-02-17 1988-08-24 Rasselstein Ag Verfahren zur Herstellung einer Tiefziehdose aus Blech
FR2676667A3 (en) * 1991-05-24 1992-11-27 Sollac Device for the deep-drawing of sheet-metal blanks

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150298197A1 (en) * 2012-12-19 2015-10-22 Nippon Steel & Sumitomo Metal Corporation Press-forming tool and method for manufacturing press-formed product
US9878362B2 (en) * 2012-12-19 2018-01-30 Nippon Steel & Sumitomo Metal Corporation Press-forming tool and method for manufacturing press-formed product
WO2016031297A1 (ja) * 2014-08-26 2016-03-03 本田技研工業株式会社 クッションピン
CN106457344A (zh) * 2014-08-26 2017-02-22 本田技研工业株式会社 缓冲销
JPWO2016031297A1 (ja) * 2014-08-26 2017-04-27 本田技研工業株式会社 クッションピン
GB2543977A (en) * 2014-08-26 2017-05-03 Honda Motor Co Ltd Cushion Pin
CN106457344B (zh) * 2014-08-26 2018-12-11 本田技研工业株式会社 缓冲销
US10603708B2 (en) 2014-08-26 2020-03-31 Honda Motor Co., Ltd. Cushion pin
GB2543977B (en) * 2014-08-26 2020-06-17 Honda Motor Co Ltd Cushion Pin
CN109774108A (zh) * 2019-01-16 2019-05-21 梁格 一种塑料板料压制机
JP2020127964A (ja) * 2019-02-12 2020-08-27 新明工業株式会社 金型装置

Also Published As

Publication number Publication date
EP0614711B1 (de) 1998-06-17
FR2702401A1 (fr) 1994-09-16
ATE167413T1 (de) 1998-07-15
FR2702401B1 (fr) 1995-06-16
DE69411049D1 (de) 1998-07-23

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