Soichi Ibaraki, Kyoto University

This paper introduces an algorithm to generate a new offset tool path, which is able to regulate cutting engagement with workpiece at a desired value. The inherent idea of the proposed algorithm is to modify the previous tool path trajectory to regulate the pre-cut surface trajectory for the finishing path such that the finishing path is subject to the desired engagement angle. The expectation is that by regulating the cutting engagement angle along the tool path trajectory, the cutting force can be controlled at any desirable value, which will potentially reduce variation of tool deflection, thus improving geometric accuracy of machined workpiece. In this study, an application of the proposed algorithm for tool path modification is demonstrated to a case with the feedrate optimization scheme. Cutting experiments on the core workpiece of hardened steel material are carried out to verify the significance of the proposed approach.

Key Words: Contour milling, cutting engagement angle, tool path modification, cutting force, geometric accuracy