To study the effect of the wheel-arc error on large-scale rectangular axisymmetric aspheric machining, the grating parallel grinding method is adopted and the mathematical model of wheel-arc error separation is built. The factors that affect the surface accuracy are analyzed and it is found that the wheel-arc error is the most sensitive in the factors. According to the grinding and measurement method, the wheel-arc error is separated. Using the new wheel-arc radius modified by separated wheel-arc error and the new compensation data subtracted from wheel-arc error, the separating error compensation grinding is carried out and proves effective. The experimental results show that the aspheric surface error decreases by 14% and 35% after separating error compensation grinding in rough and fine grinding conditions. The error model can separate the wheel-arc error effectively and the accuracy of the aspheric surface is improved.%研究了砂轮圆弧半径误差对大口径矩形轴对称非球面加工的影响.采用直线光栅式平行磨削的加工方式,建立了砂轮圆弧半径的误差分离的数学模型,分析影响面形精度的因素,根据加工及测量方式将砂轮圆弧半径误差分离出来,利用分离的砂轮圆弧半径误差更新砂轮圆弧半径,同时采用分离后的误差数据进行补偿加工.实验结果表明:对比不分离的补偿加工结果,粗磨和精磨条件下的分离误差补偿加工后的面形误差分别减小了14％和35％,该误差模型能够有效地分离出砂轮圆弧半径误差,分离误差效果明显,提高了加工的精度.
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