文章提出了一种基于微机的用于实现数控加工碰撞检测的新方法。该方法的基本思路是：建立机床最大加工范围的分层空间索引模型；在各层内，将刀具截面收缩为刀轴上一点，同时相应放大碰撞检测另一方的截面，使两物体之间的三维碰撞问题转化成判断二维平面内一点与一封闭轮廓曲线相对位置的问题。文中举例说明了该方法在ＮＣ验证系统中的应用。 This paper presents a new method based on microcomputer for NC machining collision detection. The basic idea of ​​this method is: to establish a stratified spatial index model of the maximum machining range of the machine tool; in each layer, the tool cross section is shrunk to a point on the arbor, and correspondingly, the cross section of the collision detection enlarged, The problem of three-dimensional collision is transformed into the problem of determining the relative position between a point in a two-dimensional plane and a closed contour curve. The paper illustrates the application of this method in NC verification system.