逆向工程被广泛应用 ,以提高机械工程的开发效率。采用混合有理B啨ｚｉｅｒ曲面拟合曲面的方法 ,计算得到了曲面的等距面和每一点的法曲率 ,并提供了数控加工刀位所必需的曲面数据 ;构造出了导轮的模型 Reverse engineering is widely used to improve the development efficiency of mechanical engineering. Using the method of mixing rational B 啨 zier surface fitting surfaces, the isometric surface and the normal curvature of each point are calculated and the surface data necessary for NC machining are provided. The model of guide wheel is constructed.