METHOD FOR PREDICTING UPSET SHAPE OF CIRCULAR FORGING

摘要

<P>PROBLEM TO BE SOLVED: To shorten a trial time and reduce defectives in upsetting circular forgings. Ž<P>SOLUTION: A method for predicting an upset shape of a circular forging has a first step of computing a predetermined number of relationships between a diameter and height in upset forging by a finite element method about each of a plurality of models of circular material, a second step of computing a predetermined number of relationships between a diameter expansion rate and an upsetting rate of corresponding preforms from the diameter-height relationships, a third step of performing polynomial approximation using the predetermined number of diameter expansion rates and upsetting rates to compute a prediction formula about each of the plurality of models of circular material, and a fourth step of selecting the most reliable approximation formula from the plurality of prediction formulae. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž