镍基单晶高温合金微尺度磨削温度仿真

Micro-grinding Temperature Simulation for Nickel-Based Single Crystal Superalloy

针对镍基单晶高温合金具有较强各向异性以及镍基单晶高温合金微尺度磨削温度场研究较少的情况,建立了基于Hill模型的三维磨削温度仿真模型,并采用任意拉格朗日-欧拉法(ALE),实现单晶材料微磨削过程有限元温度仿真,分析微磨削过程中的温度场分布及其变化情况,研究了不同磨削深度、磨削速度以及不同晶面{(100),(110)和(111)}对微磨削温度的影响规律.结果显示:微磨削高温区发生在磨粒前表面与工件接触的半椭圆形区域,即第Ⅱ温度区;磨削区域温度随着磨削深度增加而增加,随着主轴转速增加而增加;在镍基单晶高温合金不同晶面内微磨削时,(111)晶面温度最高,(110)晶面次之,(100)面微磨削温度最小.

According to the condition that rare studies are working on micro-grinding temperature field for the nickel-based single crystal superalloy which has strong anisotropy, three dimensional simulation model based on the Hill model was established by ALE method for temperature simulation in micro-grinding process for nickel-based single crystal superalloy. The distribution and variation of temperature fields in the micro-grinding process were discussed, and the influences of grinding depth,grain velocity and different crystal face {(100),(110) and(111) }on the micro-grinding temperature were analyzed. The simulation results showed that the high temperature zone happens in the semi ellipse region between the front surface of abrasive and the workpiece. The grinding temperature increases with the grinding depth and grinding speed. During the micro-grinding of single crystal materials,the temperature of(111) crystal plane is the highest,and the(110) is the second,and the(100) is the least.