Method of predicting damage of dies
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United States of America Patent
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Issued Date -
Nov 30, 2006
app pub date -
May 25, 2006
filing date -
May 25, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Disclosed is a method of predicting damage of dies for plastic processing of metals, typically, forging dies, to contribute to die design including choice of material, hardness and configuration of the die. The method is characterized in that the plastic flow criteria value 'Dc' defined by the formula below is calculated: Dc=.sigma..sub.eq/(YS.times.S.sub.Rtotal), wherein .sigma..sub.eq is Von Misese's equivalent stress, YS is dynamic compressive yield stress, and S.sub.Rtotal is softening rate, and that the damage of die is predicted with the condition that, if the value of Dc reaches 1.0, the plastic deformation or the plastic flow begins to occur
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