AN UPPER-BOUND CUTTING MODEL FOR OBLIQUE CUTTING TOOLS WITH A NOSE RADIUS

The geometry of practical cutting tools is complex, and usually involv es both non straight cutting edges and obliquity. It is of great pract ical importance to be able to predict cutting forces and chip flow dir ections for such tools. The authors demonstrate the use of a simplifie d geometry together with an upper bound model to predict the direction of chip flow. The model proposed includes a requirement for approxima te force equilibrium as a method of estimating rake face contact area. A comparison of the results with those from earlier models and with e xperimental data is provided. Finally a proof of the Stabler chip flow hypothesis is given: it is shown that the hypothesis is only valid fo r the case of zero rake face friction. Copyright (C) 1996 Published by Elsevier Science Ltd