中文摘要：

为了在三维CAPP系统中实现铣削类零件由初始毛坯向最终零件的动态演变,提出了一种面向铣削类零件的三维工序模型构建方法。首先,研究了曲线和偏置曲线的表达、直线段和弧线段的偏置及交点的计算规则;接着,以给定的余量值和刀具半径作为偏移量,对制造特征的外环曲线进行偏置以计算获得偏置曲线;然后,通过拉伸偏置曲线并与前驱工序模型进行布尔运算,完成三维工序模型的生成。最后,通过实验验证了该方法的有效性和可行性。

英文摘要：

A novel construction method of three-dimensional process model based on the curve offset is proposed,which tackles the problem of converting a blank to a product part in a three-dimensional CAPP system. Firstly,the expression of the curve and offset curve,the offset rules of line and arc and the intersection rules are presented. Secondly,under a given the allowance and tool radius,the offset curve is obtained by offsetting the outer loop of machining features.Finally,the 3D process model is generated by extruding the offset curve and executing the Boolean operation on the precursor process model. The experimental results demonstrate the effectiveness of the proposed method.