METHOD OF DETERMINATION OF COMPONENTS OF CUTTING FORCE AT NC LATHE Russian patent published in 1998 - IPC

FIELD: machining; operation of NC lathe in manual (adjustment) and automated modes. SUBSTANCE: components of cutting force are determined for calculation of clamping forces ((P_z)) of parts and permissible sagging ((P_y)) of parts in finish and semi-finish turning. For determination of cutting force components, short-duration test pass by cutting tool is performed to measure thermo emf. Thermo emf thus found is used for determination of correction for physical- mechanical properties of contacting pair and geometry of tool. Cutting force components P_z, P_y and P_x are determined on basis of found thermo emf and working parameters of cutting process (t, S, V) by the following formulae: P_z= (A_z+K_zE)t¹S^0,75V^-0,15, kgf; P_y= (A_y+K_yE)t^0,9S^0,6V^-0,3, kgf and P_x= (A_x+K_xE)t¹S^0,5V^-0,4, kgf. Method enhances accuracy of determination of cutting force components by automated (programmed) way due to taking into account variations of physico-mechanical properties of steels to be machined, their hardened state in the course of cutting and thermophysical properties of cemented-carbide tools both in Grades of solid alloy and inside Grade composition. EFFECT: enhanced accuracy of determination of cutting force components. 15 tbl