传统的直线段逼近复杂曲线的零件加工方法存在零件表面有刀痕、用户的数控程序过长等不足,为此提出了一种用圆弧逼近复杂曲线的加工方法.阐述了它的数据处理原理及关键步骤的程序处理,并以椭圆曲线加工为例,验证了本方法的可行性和优点. The traditional method of machining complex curves with straight-line segments has some defects such as cutting marks on the part surface and too long user’s NC program, so a machining method of approximating a complex curve by using arc is proposed. The principle of data processing And the key steps of the program processing, and elliptic curve processing as an example, verify the feasibility and advantages of the method.