Stress of ZrN-Coated Cutting Tools under High Temperature Friction

Abstract

Objective of this research is to analyze the stress of coated cutting tools under high temperature friction, and figure out the laws in the stress change under different loads and rotate speeds. This paper constructed a finite element model and used it to analyze the frictional wear between the test block (ZrN-coated series hard alloy cutting tools) and the high-speed steel friction ring. In the experiment, with the effect of high temperature taken into consideration, the friction process was dynamically simulated under different loads and rotate speeds, the laws of the distribution of stress during this process under the mentioned conditions were attained, and the results of multiple sets of experiments showed that, the maximum equivalent stress and shear stress of uncoated hard alloy cutting tools were significantly higher than those of coated cutting tools. The maximum principal stress appeared in the center part of the contact area of the friction pair, and the maximum shear stress appeared in left-of-center part of the contact area of the friction pair, its size increased with the rise of load, while the rotate speed had little impact on it. The stress analysis of ZrN-coated cutting tools can provide useful theoretical reference for the fabrication of ZrN-coated cutting tools.