摂動逆解法による鍛造加工における摩擦係数の推定

抄録

An estimation method based on the idea of perturbation and inverse solution of the rigid viscoplastic FEM is developed to evaluate the friction at the die-workpiece interface. Numerical simulations of the ring compression test illustrate the ability of the method to determine the varying friction coefficients. Possible estimation deviation in the presence of measurement errors is discussed. The analysis was applied to the measured internal diameter-reduction in height data, and the results revealed some transient features of friction during the process which could hardly have been indicated by the usual calibration curves. This approach was also useful for the problems with the interfaces of different friction conditions.