推算了双圆弧拟合非圆曲线的数学模型,计算了在允许误差范围内节点表达式,编写了基于宏程序的双圆弧法拟合双曲线的节点计算程序和双曲线型零件加工程序,解决了在只有圆弧和直线插补的数控机床上加工非圆曲线型零件的问题。 The mathematic model of double circular arc fitting non-circular curve is deduced, the node expression is calculated in the allowable error range, the hyperbolic fitting hyperbolic node calculation program and hyperbolic type part machining program , Which solves the problem of machining non-circular curved parts on CNC machine tools with circular and linear interpolation only.