HOVF WC-10Co4Cr涂层磨削瞬态温度场及应力场数值模拟  

Numerical Simulation of Transient Temperature Field and Stress Field in Grinding of HVOF WC-10Co4Cr Coating

作　　者：易军 金滩 邓朝晖 周炜 Yi Jun;Jin Tan;Deng Zhaohui;Zhou Wei(Intelligent Manufacturing Institute, Hunan University of Science and Technology, Hu′nan Xiangtan 411201, China;Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material, Hu′nan Xiangtan 411201, China;National Engineering Research Centre for High Efficiency Grinding, Changsha 410082, China)

机构地区：[1]湖南科技大学智能制造研究院,湖南湘潭411201 [2]难加工材料高效精密加工湖南省重点试验室,湖南湘潭411201 [3]国家高效磨削工程技术研究中心,长沙410082

出　　处：《机械科学与技术》2020年第3期438-445,共8页Mechanical Science and Technology for Aerospace Engineering

基　　金：湖南省教育厅科学研究项目(18C0305)资助。

摘　　要：从经典热传导方程和热弹塑性力学出发,建立了磨削过程中移动热源作用超音速火焰喷涂WC-10Co4Cr涂层材料的二维传热模型和热应力模型;在考虑材料热物理参数随温度变化的基础上,利用有限元分析软件ANSYS来研究双层材料在磨削热-结构耦合作用下的瞬时温度场和应力场。数值研究结果表明,由于WC-10Co4Cr涂层热传导系数和比热容比300M钢基体大,所以温升主要停留在涂层内;磨削温度沿工件深度方向非连续分布,涂层基体结合面的温度梯度最大;由于涂层、基体材料热膨胀系数差异较大,在结合面处产生极大的热应力;磨削温度、涂层-基体结合面热应力随涂层厚度的降低而增大。开展了磨削温度测量实验,测量了不同涂层厚度时工件表面的磨削温度,对数值仿真结果进行了验证。Based on the classical heat conduction equation and thermoplastic mechanics,the two-dimensional heat transfer model and thermal stress model for the grinding process of High Velocity Oxygen Fuel(HVOF)WC-10Co4Cr coating under the action of moving heat source were established.On considering the temperature dependent material properties,the transient temperature field and thermal stress field were simulated via finite element method.As the thermal conductivity and specific heat capacity of WC-10Co4Cr are larger than 300 M,the temperature rise mainly stays in the coating.The grinding temperature is discontinuous along the depth direction of the workpiece,and the temperature gradient of the coating/substrate junction surface is the largest.Due to the large difference in thermal expansion coefficient between the coating and the substrate,the great thermal stress is generated at the bonding surface.The grinding temperature and thermal stress of the coating/substrate junction surface increase with the decreasing of coating thickness.The grinding temperature experiments were carried out,the surface grinding temperature with different coating thicknesses was measured and the simulation results were compared with those experimental.A good agreement was found between the FEM results and the experimental.

关 键 词：磨削 超音速火焰喷涂涂层 有限元方法 磨削温度场 磨削应力场 

分 类 号：TH162[机械工程—机械制造及自动化]