提出了一种用隐藏曲线消除算法来确定５轴ＮＣ加工无干涉可加工性区域的方法．该方法基于高斯映射理论，将５轴铣削的可加工性区域变换成３轴铣削的可加工性区域，也就是，首先应用ＭＳ映射对加工曲面Ｓ（ｕ，ｖ）和约束表面Ｋ（ｓ，ｔ）进行数值计算，然后在正交子空间中采用隐藏曲线消除算法，将加工曲面的隐藏区域裁剪掉，则剩余部分能用平底刀在没有被约束表面干涉的情况下进行５轴ＮＣ加工． A method to eliminate the interfering machinability area of ​​5-axis NC machining using hidden curve elimination algorithm is proposed. This method transforms the 5-axis milling workability region into the 3-axis milling workability region based on the Gaussian mapping theory. That is, firstly, MS mapping is applied to the machining surface S (u, v) and the constraint surface K t), then the hidden curve elimination algorithm is used in the orthogonal subspace to cut out the hidden area of ​​the machined surface. Then, the remaining part can be machined by 5-axis NC with a flatbed knife without any interference of the constrained surface.