Digital Design and Manufacture of Spatial Cams

In order to design and manufacture spatial cams rapidly and precisely,a CAD/CAM system is introduced for the design of 3D modeling and automatic programming in NC machining. Based on Pro/ENGINEER software used widely in CAD/CAM systems,according to the curve equation of spatial cam follower’s motion specification,the follower displacement curve is drawn quickly and accurately,then the 3D modeling of spatial cam is created using Pro/Feature module in accordance with this curve,afterwards,the quality of contour surface of spatial cam is inspected by the use of surface analysis,the result of which is fed back to the modeling design of spatial cam; after analyzing the machined theory of spatial cam,the NC machining code for it is programmed automatically according to this theory and the modeling completed in the Pro/Manufacture module. To design and manufacture spatial cams by this process can be modified circularly on the basis of the surface checking information in terms of feedback data,so the contour surfaces created have high precision,excellent kinematic characteristics and dynamic characteristics.

利用CAD/CAM系统设计与加工空间凸轮

为获得优良的运动特性和动力特性,空间凸轮设计较之一般产品设计,其轮廓曲面要求较高精度。因此,本文着重论述了如何利用CAD/CAM系统设计空间凸轮,以及在完成空间凸轮的建模后,如何利用CAD/CAM系统中的曲面分析功能分析空间凸轮3D模型,并介绍了基于CAD/CAM系统利用3D模型进行数控加工编程的方法。空间凸轮CAD和数控加工的关键问题是如何将从动件的运动规律转换为凸轮轮廓。本文以常见的圆柱凸轮为例,利用Pro/E软件实现了圆柱凸轮的3D设计与数控加工。