Application of CAD to Maximising DIE Life Based on the Estimation of Working Stresses
This paper deals with the effect of the geometry of the die-shrink ring interface on the stress concentration occuring in the bore of a cold forging die. The aim is to minimize the stress concentration at the fillet radius in the bore and achieve an improvement in die life. The work is mainly analytical, using elastic stress analysis and finite element methods to determine the data base. Using the data base, the penalty function method (SUMT method) is applied to obtain the configuration of the die-shrink ring interface. A suitable fitting pressure distribution is achieved by using slightly different taper angles on the die and shrink ring. The working stress distribution along the die surface is complex and optimisation should be very advantageous.
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