METHOD OF DETERMINATION OF LENGTH OF CHIP CONTACT WITH CUTTING TOOL FRONT SURFACE Russian patent published in 1998 - IPC

FIELD: machining of metals. SUBSTANCE: method consists in action of impact load on metal specimen and determination of identical radius r on metal specimen, cutting of it at speed V and measurements of chip thickness Q, determination of length C₁ of its plastic contact with cutting tool front surface, determination of chip contact overall length C_c, comparison of C_c with experimentally obtained value of chip contact overall length C_e. Besides, the value of allowable error of one parameter, characterizing the specimen condition, is determined, with due account of which chip contact overall length C_c is determined and this parameter is corrected before determination of chip contact overall length C_c for different cutting parameters. Prior to action of impact load, metal specimen is subjected to action of tensile load, and stress σ in specimen, modulus of elasticity E and deformation delay time T in specimen are determined from relation T=σ/E•ε ,, where ε - deformation rate. This time is selected as a correctable parameter. Length C₁ of chip plastic contact with cutting tool front surface is determined from relations involving the above parameters, as well as γ - front top rake angle of non-cutting tool. EFFECT: facilitated procedure. 1 tbl