Development And Cutting Performance Of Bionic Structure Ceramic Cutting Tools

High hardness, high melting point, good thermal stability and wear resistance performances are the advantages of ceramic cutting tools, but the disadvantage of ceramic cutting tool mainly in its brittleness, which greatly limits the use scope of ceramic cutting tools. In order to improve the brittleness of ceramic cutting tools, in this topic, the bionic idea is introduced into the structure design of ceramic cutting tool, and successfully development the bionic structure ceramic cutting tools, and use of the finite element software analyses the residual stress and thermal stress, and studies the mechanical properties, microstructure structure and cutting performance.Establishing the bionic structure ceramic cutting tools material residual stress models and interlayer-temperature and thermal stress analysis models, and analyses the residual stress distribution and interlayer-temperature and thermal stress variation in the cutting process of the bionic structure ceramic cutting tools material. Study on the influence of the residual stress distribution and the change of interlayer-temperature and thermal stress of bionic structure ceramic cutting tools material in different layer thickness ratio and different layer number. The results show that in the sintering process of bionic structure ceramic cutting tools materials form the residual compressive stress in surface layer when cutting tools material layer thickness ratio and layer number are increased, its value is increasing. With the increasing of layer thickness ratio and layer number of bionic structure ceramic cutting tools, between the first layer and second layer of tool nose, the value of interlayer temperature and thermal stress is gradually increased, but between the last layer and subbase layer of tool nose, the value of interlayer temperature and the maximum tension stress is gradually reduce. And according to the analysis results of the residual stress distribution and the change of interlayer-temperature and thermal stress, the structure of bionic structure ceramic cutting tools is designed in layer number is three layers and layer thickness ratio is 2.By hot pressing sintering process to development samples of three layers structure of bionic structure ceramic cutting tools, and test its physical and mechanical properties, analyze its microstructure. The analysis results show that the bionic structure ceramic cutting tools are higher values of fracture toughness and hardness than cutting tools which made by monomer surface material of bionic structure ceramic cutting tools.Continuous cutting harden T10A material and harden 45# steel to compare with the cutting performance of bionic structure ceramic cutting tools and monomer surface materials ceramic cutting tools SG4, and analyzes the wear morphology and mechanism of bionic structure ceramic cutting tools. At the same time, using Deform-2D simulates the cutting hardened 45# steel process to analyze the cutting performance of bionic structure ceramic cutting tools.The results show that as surface residual stress exists, the cutting performance of the bionic structure ceramic cutting tools is better than that monomer surface material ceramic cutting tools, and the wear morphology of the bionic structure ceramic cutting tools is mainly adhesive wear in high speed cutting; In the result of simulation, the bionic structure ceramic cutting tool shows superior thermal stress relief performance.