单晶刚玉砂轮磨削AerMet100钢磨削温度场

Temperature field of grinding Aer Met100 with single alundum wheel

为研究单晶刚玉（SA）砂轮磨削Aer Met100超高强度钢表面完整性形成机理需要,采用试验和数值分析方法,从宏观和微观两方面对磨削温度场展开研究.试验建立Aer Met100钢的本构模型,为数值分析提供基础;实施磨削力和温度测量试验,根据结果确定作用于工件表面的磨削热载荷;分别建立数值分析模型,对磨削热作用形成的磨削区温度场及磨粒切削作用形成的磨削点温度场进行分析计算;分析宏观磨削区温度场和微观磨削点温度场的特征及工艺参数的影响.结果表明,磨削温度处于190～500℃,与磨削工艺参数正相关,磨削点温度场最高温度位置位于工件与磨粒接触区边缘前端,温度可达到约820℃,磨削点温度场的影响深度约为5～10μm.

For researching the surface integrity formation of Aer Met100 ultrahigh strength steel during grinding with single alundum wheel,the grinding temperature field was studied from the macro- and micro-viewpoint by means of experiments and numerical simulation. First,the constitutive model of Aer Met100 was established by tests,and then an experiment for measuring grinding force and temperature was carried out. Based on the results,the grinding thermal load acting on grinding surface was determined. Finally,two kinds of FEA numerical simulation were finished. One was to simulate the macro temperature distribution in grinding zone,and another was to simulate the micro temperature field near the contact zone between grain and workpiece.Results show that the maximum temperature in macro grinding temperature field ranges from 190 ℃ to 500 ℃,and that in micro temperature field can be up to 820 ℃. The influence depth of micro grinding temperature field is 5 μm to 10 μm.