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Method and apparatus for bending malleable plates

  • US 5,901,601 A
  • Filed: 04/08/1998
  • Issued: 05/11/1999
  • Est. Priority Date: 04/25/1997
  • Status: Expired due to Fees
First Claim
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1. A method of press bending a plate of malleable material in which a punch is inserted into a chamfered recess of a die to thereby bend the plate into a shape conforming to a distal end face and a side face of the punch, the method comprising the steps of:

  • a first bending step comprising bending the plate with a first edge provided at an outer side of the distal end face of the punch and a third edge provided at a border of the chamfered recess and a top surface of the die, said first and third edges serving as lines of contact with the plate; and

    a second bending step comprising bending the plate with a second edge provided at a lower side of the side face of the punch and the recess of the die, said second edge serving as a line of contact with the plate after the plate bent during the first bending step comes into contact with the second edge;

    wherein a portion of the punch between the first and second edges does not contact the plate throughout the steps.

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