The Study Of Intigration Methods Between CAD/CAM And CMM System

Modern Factory Automation - - Filexible Automation pushes the development of inspection technology to the direction of high efficiency and intellgence. As a kind of modern inspection instrument, the coordinate measuring machine (CMM) has the potent of adapting Modern Factory Automation. One of the important things is to improve it' s efficiency and common adaptable. In traditional CMM inspection programs are also programed manually. All these result in it' s low efficiency. Now Computer Aided Design System- -CAD are developing quickly. Their functions are becoming stronger and stronger , and the users can use themmore and more conveniently. CAD/CAM technology is used wide in manufacturing .These provide the condition and possibility for integrating CAD with CMM. According to the requirement of modern industry and the characteristic of CMM, with the help of CAD/CAM, we proposed a new view - - CAD/CMM. In CAD/CMM system, the data integration between CAD and CMM is one of the important problems. After analylising different kinds of CAD software and their functions of integration, taking into account the existing CMM measuring format ,the author decided to use the AutoCAD as the design tool, which is used very wide in China, and to adopt IGES as the medium for data communication between AutoCAD and CMM. This is a new attempt in C inspection technology.The main research work of the thesis is aimed at the data communication between AutoCAD and CMM. In the thesis .reading the IGES file-3-and all the geometry entities and annotation entities are extracted; On the base of geometry entities extracted, Geometry entities are classified based to their three views. A new data structure is proposed to describle 3D form features ;Inspection items of the workpiece are recognized ; The CMM-based inspection planning system is built; On the other hand, as a part of CIMS, CMM need exchanging data with the software of CAD/CAM, so IGES export interface is developed based on IGES standard. In order to show the whole information of the surface, the 3-dimensional free-form surface is drawing using the OpenGL...