CAPP中轴类零件工序图自动生成技术研究

工序图是工艺设计结果的图形表达形式,其绘制的自动化程度低,是CAPP技术进步的主要瓶颈之一。针对运用AutoLISP二次开发工具以及数据库技术实现工序图自动绘制过程中,计算机对各个图元的自动识别、编辑和操作的要求,提出了一种轴类零件工序图自动生成的新方法,在参数化绘制预处理零件图的过程中,通过给各个图元重新命名完成了零件几何特征信息的存储,并将零件加工工艺信息代码化,采用逆序修改特征的方法实现了轴类零件工序图生成的自动化。研究结果表明,由计算机生成的一套工序图可以准确地反映出零件在从毛坯到成品的制造过程中,零件的形状和尺寸变化情况以及加工工序中的各个工艺要素,对其他类型零件的工序图自动生成也具有一定的参考价值。

Automatic generation of process drawing for shaft parts in CAPP system

Process drawing is the graphic expression of process design results. The low automation efficiency in process drawing generation is one of the main bottlenecks in computer aided process planning （CAPP） system. Aiming at realizing the automatic identification, editing and operation of each element by computer, by comprehensive utilizing the AutoLISP provided by AutoCAD and the data base technique, a new approach was proposed for producing the process drawing of shaft parts automatically. In the process of parametric drawing part sketch, store the geometry feature information through renaming the graphic elements. By coding the parts processing information, and modifying the characteristics in reverse order, the automatic generation of process drawing for shaft parts was realized. The results indicate that the process drawings generated by computer could accurately reflect the shape and size changes of the parts from blank to product in their manufacturing process. It also has a certain reference value to other kinds of parts.