A Study on the Thermal Crack Resistivity of the Cutting Tool (2nd Report)

Parameters Deciding Macroscopic Thermal Crack Resistivity

Abstract

Parameters which can evaluate the macroscopic thermal crack resistivity of cutting tool materials, have been studied in this report. The resistivity parameters and thermal stresses inside the tool are derived from the equation which was derived in the previous report and gives the transient cutting temperatures in interrupt cutting. High speed interrupt cutting tests of plain carbon steel using cutting tools with different properties were conducted and the numbers of interrupt cutting until thermal crack generation were examined. The experimentally obtained numbers are proportional to their own resistivity parameters.