Bionic Design Of Coating Tool’s Joint Surface

With the development of science and technology, a variety of difficult materials continue to emerge and applied to the practical production and daily life, so the problems of tool’s wear and service life requires us to find new solutions. Bonding strength between coating tool’s film and substrate is of important significance for tool life, and this problem has perplexed some specialists for last many years. After hundreds of millions years of evolution, animal teeth and laws have formed excellent biological properties, and it provides the biological basis of the cutting tool’s bionic research.The research object of this paper is the joint surface of coating tools, and the research purpose is to improve the bonding strength between coating tool’s film and substrate, and the method is to design some new joint surface shapes based on bionics and study the joint surface stress distribution through the numerical simulation method. The paper takes healthy tooth as research object, and carries on the data fitting to the enamel-dentinal joint surface based on the least squares method and optimizes it. According to the result of the data fitting, the paper designs a series of joint surface shapes and gives out mathematical models of the bionic design surfaces. The paper uses ABAQUS software to simulate and analyze the bonding strength between film and substrate of different joint surfaces based on the substrate stretching test method, and obtains the best shape parameters under a certain film thickness. At last, the paper uses ABAQUS software to simulate the interface residual stress distribution of bionic model, and analyzes the bionic surfaces’influence on residual stress.The results show that the new bionic designed joint surface based on the enamel-dentinal joint surface of tooth can improve film stress distribution and film thermal residual stress distribution.