根据磨床各平台相对运动关系,建立工件坐标系作为参考坐标系,将砂轮磨削运动分解到工件母线的切向、法向和旋转方向上,即分别代表机床下台、中台的平移和上台的旋转,推导出了工件磨削加工过程的一般模型,并进行了模拟计算.分析了模型加工误差,以加工曲线相对理论曲线的法向误差表征局部误差,以法向误差的峰峰值表征曲线轮廓度.实例的计算结果表明:机床模拟磨削加工的工件轮廓度为3.3 μm,实现了特殊工件的精密加工.%Based on the relative motion of each platform of the grinder, the workpiece coordinate system was set as a reference, the movement of the grinding wheel was split into three directions of tangential, normal and rotation, which represented separately the parallel move of middle and lower tables, and the rotation of upper table. The common motion model of grinder was built and simulated. The machining error of model was analyzed, and the normal deviation between machining curve and theoretical curve was used to characterize the part accuracy, the peak to peak value of normal deviation was used to characterize the curve profile. The simulation experiments of a workpiece were conducted with the curve profile of 3. 3 μm. So precision machining of special workpieces is realized.
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