EP0297475A2 - Blechtiefziehvorrichtung - Google Patents

Blechtiefziehvorrichtung Download PDF

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Publication number
EP0297475A2
EP0297475A2 EP88110182A EP88110182A EP0297475A2 EP 0297475 A2 EP0297475 A2 EP 0297475A2 EP 88110182 A EP88110182 A EP 88110182A EP 88110182 A EP88110182 A EP 88110182A EP 0297475 A2 EP0297475 A2 EP 0297475A2
Authority
EP
European Patent Office
Prior art keywords
die
punch
plate
pistons
stroke
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
EP88110182A
Other languages
English (en)
French (fr)
Other versions
EP0297475A3 (en
EP0297475B1 (de
Inventor
Giovanni Ronda
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.)
FIR Srl
Original Assignee
FIR 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 FIR Srl filed Critical FIR Srl
Publication of EP0297475A2 publication Critical patent/EP0297475A2/de
Publication of EP0297475A3 publication Critical patent/EP0297475A3/en
Application granted granted Critical
Publication of EP0297475B1 publication Critical patent/EP0297475B1/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
    • 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
    • B21D24/08—Pneumatically or hydraulically loaded blank holders

Definitions

  • the present invention relates to an apparatus for drawing plate.
  • the field of the present invention is that of presses for drawing plate, which comprise a supporting structure formed by a punch-holder part, which is generally the base of the press, by an opposite part, generally arranged at the top of the press, and by a number of connecting tension elements, generally four, which also have the function of guides for the sliding of the moving parts of the press.
  • the punch generally actuated by a piston, is surrounded by a hollow blank holder body and couples, during actuation, with a die supported by an abutment body, generally called "ram", thus determining the shape of the drawn part.
  • the plate is placed and pressed, for drawing, between the die and the hollow blank holder body. Naturally the operating pressures between the die and the hollow blank holder body must be high.
  • the die must be raisable by an amount at least equal to the depth of the executed drawing.
  • the pistons which press the die against the hollow blank holder body are merely pressers and have no return valves.
  • the lifting of the die for the extraction of the drawn part after drawing occurs by means of a special small-size piston, preset for this purpose alone.
  • the aim of the present invention is to eliminate the above described disadvantages by providing an apparatus which allows to achieve a high load using a normal number of pistons and normal operating pressures.
  • An object of the invention is to allow a constructive simplification by eliminating the long-stroke pistons and the quick-filling valves.
  • a further object of the invention is to reduce dimensions by eliminating the need to provide pits in the floor for the insertion of the machine.
  • Not least object of the invention is to achieve a simplification of maintenance.
  • the apparatus comprises a supporting structure formed by a punch-holder part 10 and by an opposite part 11, connected by at least two, preferably four tension elements 12, 13, 14 and 15.
  • the punch 16 is supported by the punch-holder part 10 and is adapted to engage and disengage the corresponding die 17.
  • the coupling between the punch 16 and the die 17 determines the form of the drawing of the plate, so as to allow the forming of tubs, containers, shaped parts, as required, according to the configuration of the punch 16 and of the corresponding die 17.
  • An abutment body or ram 20 is provided, supporting the die 17, and is slideable along the tension elements 12, 13, 14, and 15, for a stroke x, which has a length at least corresponding to the depth y of the drawing to be obtained on the plate part.
  • the abutment body 20 is formed by a first element 21 which supports the die 17 and by a second element 22.
  • the first element 21 and the second element 22 are mutually coupled by means of a plurality of pistons, for example by means of the four short-stroke pistons 23, 24, 25 and 26 which are supported either by the element 21 or by the element 22.
  • the four pistons 23, 24, 25 and 26 are supported by the second element 22.
  • the second element 22 has circular dead holes which constitute the seats for the accommodation of each of the four pistons 23, 24, 25 and 26.
  • the oil sealing gaskets 27 allow continuous operation at a normal hydraulic pressure of 250 atm.
  • the second element 22 is preferably connected to said opposite part 11, in particular to the top of the press, by means of a piston 28 which has a stroke at least corresponding in length to the depth of the drawing to be obtained on the plate.
  • the second element 22 is lockable in working position by virtue of mechanical locking means.
  • Said mechanical locking means preferably comprise a plurality of spacers 30, which engage the second element 22 and the opposite part 11.
  • the spacers 30 are preferably fixable to the second element 22 and can slide through appropriate openings 31 provided on the opposite part 11.
  • the spacers 30 are fixable to the opposite part 11 and can slide through appropriate openings provided on the second element 22.
  • this second embodiment requires a much greater thickness of the second element 22 with respect to that indicated in the figures and in any case sufficient to accommodate the length of the spacers 30.
  • the spacers 30 are preferably lockable by means of a rotating plate 32 which opens or closes the openings 31 according to its angle of rotation.
  • figure 2 shows the rotating plate 32 in the position in which the openings 31 are open and can accommodate the spacers 30;
  • figure 3 shows the rotating plate 32 in the position in which the openings 31 are closed and the spacers 30 can operate in compression.
  • the spacers 30 are lockable by means of a slideable plate, not illustrated in the figure, which opens or closes the openings 31 according to the sliding positions.
  • the operation is as follows: the plate part to be drawn is inserted between the die 17 and the blank holder 35, then the abutment body 20 is caused to descend, by means of the action of the piston 28, along the tension elements 12, 13, 14 and 15, until the die 17 rests on the plate to be drawn. In this step the pressure between the die 17 and the blank holder 35 is still very small since the piston 28 only has the function of moving the abutment body 20 and is not capable of transmitting compression forces useful for drawing. The action of the piston 28 has, in any case, allowed the exit of the spacers 30 out of the openings 31. Then the rotating plate 32 is caused to rotate until it reaches the position indicated in figure 3 to close the openings 31.
  • the locking means may differ from the spacers 30 and may intervene, for example, directly on the tension elements 12, 13, 14 and 15.
  • the piston 28 may be mounted in reverse manner directly on the second element 22 or may be replaced with equivalent means, such as for example a rack.
  • the pistons 23, 24, 25 and 26 may be accommodated in seats provided on the first element 21 and perform, in an equivalent manner, the spacing between the first element 21 and the second element 22.
  • the tension elements 12, 13, 14 and 15 may be, for example, replaced with only two lateral tension elements (generally termed shoulders) formed e.g. with a square profile and welded directly to the punch-holder part 10 and to the opposite part 11. In this case the sliding of the abutment body 20 occurs on appropriate guides provided on the two lateral tension elements or shoulders.
  • shoulders generally termed shoulders
  • the apparatus according to the invention allows to achieve all the intended aims, in particular it is possible to achieve a load of 1000 tons with an abutment body 20 having a transverse cross section with a surface of only 810,000 sq.mm., which is over two and a half times smaller than the corresponding cross section obtainable with known presses with an equal number of pistons and with the same oil feed pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP88110182A 1987-06-30 1988-06-25 Blechtiefziehvorrichtung Expired EP0297475B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT21112/87A IT1217320B (it) 1987-06-30 1987-06-30 Apparato per la imbutitura della lamiera
IT2111287 1987-06-30

Publications (3)

Publication Number Publication Date
EP0297475A2 true EP0297475A2 (de) 1989-01-04
EP0297475A3 EP0297475A3 (en) 1990-06-27
EP0297475B1 EP0297475B1 (de) 1992-11-25

Family

ID=11176921

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88110182A Expired EP0297475B1 (de) 1987-06-30 1988-06-25 Blechtiefziehvorrichtung

Country Status (4)

Country Link
EP (1) EP0297475B1 (de)
DE (1) DE3876152T2 (de)
ES (1) ES2035888T3 (de)
IT (1) IT1217320B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401534A1 (de) * 1989-05-13 1990-12-12 Maschinenfabrik Müller-Weingarten AG Hydraulische Zieheinrichtung im Pressentisch einer einfach- oder doppeltwirkenden Presse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718663A (en) * 1949-09-30 1955-09-27 Crown Machine & Tool Company Injection molding machine
CH383777A (it) * 1962-02-12 1964-10-31 Triulzi S A S Novate A Dispositivo di chiusura per presse
FR2141615A1 (de) * 1971-06-14 1973-01-26 Morault Gabriel
DE3404307A1 (de) * 1984-02-08 1985-08-14 Adam Opel AG, 6090 Rüsselsheim Ziehvorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718663A (en) * 1949-09-30 1955-09-27 Crown Machine & Tool Company Injection molding machine
CH383777A (it) * 1962-02-12 1964-10-31 Triulzi S A S Novate A Dispositivo di chiusura per presse
FR2141615A1 (de) * 1971-06-14 1973-01-26 Morault Gabriel
DE3404307A1 (de) * 1984-02-08 1985-08-14 Adam Opel AG, 6090 Rüsselsheim Ziehvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401534A1 (de) * 1989-05-13 1990-12-12 Maschinenfabrik Müller-Weingarten AG Hydraulische Zieheinrichtung im Pressentisch einer einfach- oder doppeltwirkenden Presse

Also Published As

Publication number Publication date
EP0297475A3 (en) 1990-06-27
IT8721112A0 (it) 1987-06-30
EP0297475B1 (de) 1992-11-25
DE3876152D1 (de) 1993-01-07
ES2035888T3 (es) 1993-05-01
DE3876152T2 (de) 1993-04-15
IT1217320B (it) 1990-03-22

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