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

Definitions

• the invention relates to a deep-drawing tool according to the preamble of claim 1.
• the state of the art is a deep-drawing tool, which essentially consists of a stamp, a hold-down device and a deep-drawing mold.
• the hold-down device can be moved separately from the punch and is intended to sit on the sheet to be deep-drawn and hold this sheet down, while at the same time the punch moves downward and pulls the sheet into the deep-drawing mold with deformation.
• the hold-down devices consist of a metal tool which is pressurized with its own press, so that this sheet is held in place with relatively high pressure.
• the invention is therefore based on the object of producing a deep-drawing tool mentioned at the outset more cheaply.
• the invention is characterized by the technical teaching of claim 1.
• An essential feature of the invention is that the hold-down device is also incorporated in the stamp of the deep-drawing tool and is not loaded by a separate stamp.
• the hold-down device is not designed as a ring, but rather that the hold-down device consists of individual punches arranged uniformly distributed around the circumference, which punches are designed as elastomers.
• a spring stamp which is preferably formed from an elastomeric material which has a high resilience.
• a resilient attachment of the hold-down device is possible. This has the essential advantage that there is no need for a punch drive for the hold-down device itself, because according to the invention the hold-down device is arranged in the punch itself. It has now been found that certain materials are ideally suited for the hold-down devices to generate a corresponding holding force on the sheet to be held, this material being so deformable that the sheet is held in the required deformation path while the sheet is held in place (with high hold-down pressure) the mold can retract.
• a polyurethane foam is preferably used as the material for the elastic body, which has a high resilience of e.g. 50%.
• a plastic material is preferably used as the material for the brake shoes, which is adjustable with different holding properties according to the requirements.
• So z. B. used as a plastic material is a polyethylene, a polyurethane or the like. Each depending on the material used, there is a certain coefficient of friction in contact with the sheet to be held.
• the hold-down devices are also provided with the brake shoes which modify the brake shoes on the deep-drawn part.
• each hold-down device (which is designed as a stamp) has one
• the brake shoe is designed as a circumferential ring on which the hold-down devices, which are distributed around the circumference, sit piece by piece. It can
• the hold-down force can also be changed by changing the type of material and the dimensions and the hold-down device. It is important here that the brake shoe can deform slightly elastically in order to be able to adapt to the peripheral edge of the deep-drawn part.
• thermoforming machines can be built because there is no need for a separate drive for the hold-down device.
• FIG. 1 shows a schematically drawn section through a low drawing tool in a first embodiment
• FIG. 2 schematically the top view of the stamp
• FIG. 3 schematically an embodiment with an annular brake shoe
• FIG. 4 a view according to FIG. 1 through a deep-drawing tool in a second embodiment
• Figure 5 the deep-drawing tool according to Figure 4 in the closed state.
• Stamp 3 exists, which carries a staple tool 4.
• the stamping tool engages in a shaped hole 2
• a deep-drawn part 10 to be deep-drawn by the stamping tool 4.
• hold-down devices 5 are placed on the deep-drawn part 10 at the edge area around the shaped hole 2,
• each hold-down is designed approximately as a stamp, which stamp can be round, angular, oval or profiled in another way and preferably consists of an elastomer body 6.
• the hold-down devices are preferably elongated and approximately cylindrical. This elastomer body should have a relatively high resilience to ensure that when the plunger 3 is retracted in the direction of the arrow 12 downward
• a brake shoe 8 is formed on the underside of the respective elastomer body 6, which is either glued on as an independent plastic part or mechanically connected to the elastomer body.
• the brake shoe is integrally connected to the elastomer body and was produced with different hardness in the same foaming process. It is therefore important that a separately driven hold-down device is not used at all
• the elastomer bodies can, because the elastomer bodies are arranged in pieces distributed over the circumference. Moreover, there is no need for a distribution lying on an annular surface, but the elastomer bodies can be arranged in their recesses 7 on the underside of the stamp 3 in any order. Likewise, the recesses 7 can be made at different heights or with different depths at the same height by assigned hold-down devices in order to influence the hold-down force at one point in comparison to another point.
• circumferential groove 13 is formed, in which groove the aforementioned recesses 7 for receiving the hold-down 5 are formed.
• FIG. 3 shows that the brake shoe can not only be molded piece by piece on the underside of the elastomer body, but that the brake shoe as
• Brake shoe ring 9 can be formed, on which the hold-down devices 5 are placed piece by piece.
• This brake shoe ring is preferably formed from an elastomeric plastic material which adapts to the peripheral edge in the area of the die 11.
• FIGS. 4, 5 an irregular distribution of the hold-down devices 5 in the punch 3 is also possible.
• the figures show that the hold-down devices 5 according to the invention do not necessarily have to be attached at the same height. Of course, it is not necessary to attach the hold-down devices to a circle, but any geometric shape can be chosen.
• the hold-down devices are
• intermediate piece 14 which, like the brake shoe 8, can be produced in one piece with the hold-down material or produced by it and then fastened in a suitable manner.
• This intermediate piece can be used, for example, to set special suspension and damping characteristics of the hold-down device 5.
• the die 2 is provided with a counter-holder 15 at the opposite point.
• This additional stamp 16 is stored in the stamp 3
• the present invention thus provides an inexpensive to manufacture and flexibly employable deep-drawing tool

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
• Passenger Equipment (AREA)
• Food-Manufacturing Devices (AREA)
• Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Manipulator (AREA)
• Shaping Metal By Deep-Drawing, Or The Like (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7753296

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (15)

Family Cites Families (14)

• 1995
  • 1995-02-07 DE DE19503874A patent/DE19503874A1/de not_active Withdrawn
• 1996
  • 1996-02-06 WO PCT/EP1996/000485 patent/WO1996024449A1/fr not_active Ceased
  • 1996-02-06 DE DE59606093T patent/DE59606093D1/de not_active Expired - Lifetime
  • 1996-02-06 JP JP8523973A patent/JPH11508490A/ja active Pending
  • 1996-02-06 AT AT96901787T patent/ATE197258T1/de not_active IP Right Cessation
  • 1996-02-06 US US08/875,841 patent/US6354131B1/en not_active Expired - Fee Related
  • 1996-02-06 EP EP96901787A patent/EP0808224B1/fr not_active Expired - Lifetime
  • 1996-02-06 AU AU46225/96A patent/AU4622596A/en not_active Abandoned

Non-Patent Citations (1)

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