Evaluation of critical interfacial friction in cross wedge rolling

For the purpose of characterizing excess initial slip, the critical value o f interfacial friction in the cross wedge rolling (CWR) process is investig ated After describing CWR and its failure mechanisms, an analytical method is presented for determining the critical friction condition in a cross wed ge rolling process. Using specialized pin-on-disk experiments, a technique is then introduced for determining the actual friction coefficient in a CWR operation. By comparing the critical and experimental friction coefficient values, a procedure for predicting the likelihood of excess interfacial sl ip failure in cross wedge rolling is established The validity of such a pro cedure is subsequently ascertained for a specific set of operating conditio ns using the finite element method and CWR prototype experiments.