为了更好地选择非圆曲线轮廓加工的最佳逼近方法,以椭圆曲线轮廓的加工为例,建立了圆弧逼近、直线逼近和近似加工误差的数学模型,探讨了如何选取圆弧逼近法中逼近圆弧的半径。运用QBASIC编程计算出了相同条件下不同逼近方法的逼近误差,并加工出了实际零件。结果表明,圆弧逼近法是非圆曲线轮廓加工的一种高精度的方法。 In order to better select the best approximation method of non-circular curve contour machining, taking the processing of elliptic curve contour as an example, the mathematical models of arc approximation, linear approximation and approximate machining error are established, and how to select the arc approximation method Approach the radius of the arc. Using QBASIC programming to calculate the approximation error of different approximation methods under the same conditions, and processed the actual parts. The results show that arc approximation method is a high precision method for non-circular curve contouring.