Si3 N4基复合陶瓷刀具切削温度场及热应力的有限元分析∗

摘要

Finite element method was used for the temperature field and thermal stress of Si3 N4 composite ceramic tool. Three-dimensional finite element model for the calculation of steady temperature and thermal stress of Si3 N4 composite ceramic tool was established. Results showed that with increasing the cutting speed, the von-Mises stresses, maximum shear stress and maximum principal stress in common ceramic tool were much bigger than Si3 N4 composite ceramic tool in high cutting speed conditions. This phenomenon showed that Si3 N4 composite ceramic tool was more durable and more suitable for high-speed cutting.%应用有限元法对Si3 N4基复合陶瓷刀具温度场和热应力进行了分析计算。通过建立Si3 N4基复合陶瓷刀具三维温度场和热应力的有限元模型，确定边界条件，分析求解得到Si3 N4复合陶瓷刀具的温度场和热应力。结果表明：普通单质陶瓷刀具随着切削速度的提高，其由切削温度引起的最大热Mises应力、最大热切应力以及最大热拉应力的增长幅度大于Si3 N4基复合陶瓷刀具。说明Si3 N4基复合陶瓷刀具由热应力引起的破坏比单质陶瓷刀具小，寿命长，更适合于高速切削。