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Apparatus for forging of crankshafts in presses

  • US 4,646,551 A
  • Filed: 12/04/1984
  • Issued: 03/03/1987
  • Est. Priority Date: 12/13/1983
  • Status: Expired due to Fees
First Claim
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1. In an apparatus for forging a crankshaft from a bar, the combination comprising:

  • a base;

    a head mounted for reciprocal movement toward the base in a working stroke;

    one movable upper die holder mounted on said head for sliding in a direction transverse to the head movement;

    one movable lower die holder;

    connectors articulately linking the lower die holder to the base, each connector having an upper end pivotally linked to the lower die holder and a lower end pivotally linked to the base;

    drive means for coupling the upper and lower die holder so as to provide their simultaneous, synchronous movement;

    an immovable lower die holder rigidly connected to the base;

    an upper die holder which is immovable during the working stroke;

    clamping means for connecting said upper immovable die holder to the immovable lower die holder;

    two sets of die inserts each set having portions carried by respective upper and lower movable and immovable die holders, said die inserts being adapted to grip the bar on both sides of the site of a crank web to be forged; and

    additional die inserts mounted between and to the immovable lower and upper die holders, said additional die inserts being fixedly spaced from said die inserts of said immovable lower and upper die holders so as to set the adjacent crankwebs at pre-selected twist angles upon clamping of said immovable lower and upper die holders.

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