Finite Element Simulation And Cutting Experiment Of TiAlN / B _{C / CBN Multilayer Coated Blade High Speed ​​Hard Cutting}

In recent decades, coating technology is used more and more wide in the cutting tool. Cutting tool coating, which have excellent performance, will improve cutting tool in intensity, toughness, high-temperature hardness, wear-resisting property, etc. Besides, it can stabilize chemical properties of cutter material, drop frictional coefficient during machining and reduce heat to spread to tool, which can enhance the machinability of cutting tool. High-speed and hard machining is a method which machine high hardness material like quenched steel direct in high processing efficiency. This machining method can replace the ground finish of the past, achieving "cutting replace grind". But this demand cutting tool of excellent performance. Laminated coating blade-TiAlN/B4C/CBN is made with cubic boron nitride in the outer sphere. This blade can exert superiority obviously in machining high hardness material like quenched steel because of excellent high-temperature hardness, high-temperature resistance to oxidation, abrasive resistance and low frictional coefficient, so it is essential to research and analyze particularly in the coating series blade of cubic boron nitride, comprehend and master its machinability which will offer the reference data for the developing of coating tool.In this paper, DEFORM-3D simulation software of finite element is used to simulate laminated coating blade-TiAlN/B4C/CBN machining quenched steel material40CrNiMoA. Simulation process is operated by means of converting cutting speed, feed rate, cutting depth and then observe the influence in cutting force, cutting temperature and equivalent stress which are the three key factors during machining. In this way, we can obtain the machinability and the suited cutting parameter. In the paper, by means of analyzing the variation of maximum temperature between contact surface of tool and chip following with the coating layer thickness, we can optimize coating layer and obtain the best coating layer thickness of TiAlN. Then, by means of cutting experiment, contrasting the result of cutting experiment and simulation, we can checking the feasibility of DEF0RM-3D simulation software using in machining simulation. In the end, contrasting the wear of laminated coating blade TiAlN/B4C/CBN and nano-coating blade TiAlN/Al2O3, we can confirm the superiority of laminated coating blade TiAlN/B4C/CBN in the machining of quenched steel.The research results indicate the machinability of laminated coating blade TiAlN/B4C/CBN is fine. During the machining, the majority of cutting heat is taken away by chip and the wear of the blade is slight relatively, so life span of blade keep long. It is fit well to machine high hardness material like quenched steel. The best thickness of TiAlN coating is3micron.The series of CBN coating blade show perfect performance during machining high hardness material like quenched steel. It may replace completely of grinding high hardness material and it will be the significant research in the future.