B样条曲面法在数控编程中的应用

B spline Curved Serface Used in Numerial Control Programme

根据数控加工中自由曲面的特点，提出利用双参数三次Ｂ样条曲面对其进行数学描述，由此可方便地获得自由曲面上加工的刀具运动轨迹。同时简要讨论了自由曲面加工步长的确定问题。

Based on the features of the free surfaces in numerial control machining,it is possible to use two parameters cubic B spline curved surface to describe them mathematically.Therefore,it is convinient to work out the locus of the cutting tool on the free surface during the process.How to determine the length of machining steps is also discussed.