3-DIMENSIONAL CUTTING FORCE ANALYSIS BASED ON THE LOWER BOUNDARY OF THE SHEAR ZONE .2. 2-EDGE OBLIQUE CUTTING

The problem of partitioning the overall cutting force between the two active cutting edges in two edge oblique cutting, although of crucial importance in modelling the temperature and wear rates prevailing in f orm cutting, has so far eluded solution. This paper presents two solut ions to the problem: one utilizing the Merchant shear plane (MSP) appr oach and the other utilizing the solution developed in Part 1 for sing le edge oblique cutting based on the lower boundary (LB) of the shear zone. Both approaches avoid the anomalies encountered in previous atte mpts at solving the partitioning problem. This was done through the si multaneous application of the principles of chip equilibrium, force-ve locity collinearity and chip interaction. Arguments are presented to i ndicate that the LB approach is more reliable than that of the MSP app roach. Further, the LB approach is able to predict the power component of the overall cutting force in two edge cutting just as in the case of single edge cutting.