个零件的轮廓往往是多种多样的,有直线,有圆弧,也有可能是任意曲线,样条线等. 数控机床的刀具往往是不能以曲线的实际轮廓去走刀的,而是近似地以若干条很小的直线去走刀,走刀的方向一般是x和y方向-The outline of the outline of a part is often DuoZhong diverse, a straight line, arc, also may be any curve, spline line etc. Of the numerical control machine tool is often can t to the actual contour curve to walk the sword, but approximate to several small straight line to go, go in the direction of the knife knife is usually the x and y directions