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磨削表面残余应力状态是影响许多机器零件使用性能的重要表面特性之一。但它极难在磨削过程中进行监测和判断。 在平面磨床上进行大量16MoCr5表面硬化钢的磨削试验证明,磨削表面残余应力σ_Ⅱ与单位面积磨削功率P″_c及磨削力比F_n/F_t间存在很好的函数对应关系,在实验数据的基础上应用回归分析的方法建立了用过程特征参量计算表面残余测定仪应力的实验公式。当P″_c:未超过第二临界值P″_(cⅡ)时,用残余应力模型所计算的数值与由X射线应力测定仪测定的数值相符合。而在超过该临界值P″_(cⅡ)的情况下,由于磨削烧伤引起表面产生二次淬硬层其至裂纹,这时计算所得的高的拉应力值不就能在工件表面测得。 综合本研究课题的第一部分及本文的结果表明,单位面积磨削功率P″_c和磨削力比F_n/F可以作为磨削过程监测和预报表层质量的可靠的过程特征参量应用于生产实践。
Grinding the surface residual stress state is one of the important surface characteristics that affect the performance of many machine parts. But it is extremely difficult to monitor and judge during grinding. Grinding tests on a large number of 16MoCr5 case-hardened steels on a surface grinder show that there is a good function correspondence between the residual stress σ_II on the grinding surface and the grinding power P “_c per unit area and the grinding force F_n / F_t, Based on the data, a regression equation was established to calculate the stress of the surface residual analyzer with process parameters. When P ”_c: does not exceed the second critical value P“ _ (cⅡ), the residual stress model is used to calculate And the value measured by the X-ray stress meter is consistent with the case of exceeding the critical value P ”_ (c Ⅱ), the surface of the secondary hardened layer due to grinding burns caused cracks, then calculated The resulting high tensile stress value can not be measured on the surface of the workpiece. The first part of the research and the results of this paper show that the grinding power P "_c per unit area and the grinding force ratio F_n / F can be used as reliable process parameters to monitor and predict the surface quality during the grinding process.