基于低频交变磁场的陶瓷管内表面磁力研磨加工

Magnetic Abrasive Finishing of Ceramic Tube Inner Surface Based on Low Frequency Alternating Magnetic Field

为解决陶瓷管内表面质量问题,提高磨料利用率,寻求低频交变磁场下磁力研磨加工的最佳工艺参数,利用Maxwell软件对加工区域进行磁场仿真,采用Box-Behnken进行响应面试验设计并优化工艺参数,用ANOVA验证表面粗糙度预测模型的合理性。结果表明:低频交变磁场加工区域中磁场强度可达650.04 k A/m,磁感应强度可达0.82 T,表面粗糙度预测模型调整后的拟合优度R_(adj)^(2)为91.65%,经过响应面优化后得到的最佳工艺参数为工件转速977.78 r/min,铁磁粒子粒径210.61μm,金刚石粒子粒径3.35μm,电流频率3.01 Hz,使用调整后的工艺参数加工氧化铝陶瓷管件内表面120 min后,表面粗糙度Ra由2.25μm降至0.34μm,使用低频交变磁场进行磁力研磨可以有效提高陶瓷管内表面质量。

In order to solve the problem of inner surface quality of ceramic tube,improve the utilization rate of abrasive,and seek the best process parameters of magnetic abrasive finishing under low frequency alternating magnetic field,Maxwell software was used to simulate the magnetic field in the processing area.Box Behnken was used to design the response surface test and optimize the process parameters.The rationality of the surface roughness prediction model was verified by ANOVA.The results show that the magnetic field intensity can reach 650.04 kA/m and the magnetic induction intensity can reach 0.82 T in the low frequency alternating magnetic field processing area.The fitting goodness of surface roughness prediction model adjusted R_(adj)^(2) 91.65%.The optimum process parameters after response surface optimization are as follows:workpiece speed 977.78 r/min,ferromagnetic particle size 210.61μm,diamond particle size 3.35μm,current frequency 3.01 Hz.The surface roughness of the inner surface of alumina ceramic pipe is decreased from Ra 2.25μm to Ra 0.34μm after 120 min processing with the adjusted process parameters.The inner surface quality of ceramic tube can be effectively improved by using low frequency alternating magnetic field for magnetic abrasive finishing.