Carving Cad / Cam Technology Research And Implementation

With the development of engraving technology, it's hard to sculpt a complex three-dimensional object using the conventional CAD/CAM system. And how to find a fast, accurate and convenient solution to sculpt engraving parts has been a bottleneck to the development of engraving technology. Based on the further study of image engraving technology and its correlated theory, this dissertation puts forward a new designing idea and arithmetic, and ultimately makes it realized in the software design.Feature-based technology is the bridge of designing and manufacturing which has been legalized as an effective method in integration of CAD/CAM system. This dissertation analyzes the characteristic of engraving parts' machining process, and classifies the engraving CAD/CAM system by feature. It also proposes an approach to analyze and describe the feature by making use of object-oriented method. It realizes the exchange from designing feature to manufacturing feature, and the information integration of CAD/CAM system, and effectively condenses the circulation of products design and manufacture.Image vectorization is the basis of engrave-programming technology based on grey image, and the basis of later CAD/CAM data processing. On the further study of image vectorization principle, an auto-adapting adjust approach based on direction module is proposed to track image edges, which optimized paths searched. And a method of node optimization according to beeline is also put forward to decrease large amounts of short straight lines and ensure sameness of image profile to object prototype. It improves the precision of engraving and suffices the request of engrave machining.Based on image we study the tool path generation technology and problem of tool path planning. We put forward an algorithm for self-discrimination of island relation and an automatic intersected method of the region machining unit, which can judge the relationship among any plane obturate contour line effectively and swiftly. We also study the tool path generation technology of two-dimensional machining, basso-relievo machining, three-dimensional lifting-pen machining. Meanwhile, we put forward an optimize approach of tool path, which improve the efficiency of engraving.The data exchange technology is studied and the data exchange interface is provided in our own engraving system. Aiming at the shortage of complex engraving picture, slender flower-veins, the long machining code, and out of EMS memory of numerical control system, we develop a series of DNC subsystem which realizes the on-line transmission machining of engraving parts.Based on the studies above, we develop a series of engraving CAD/CAM integrated system(HD-Engrave), which gives a solution to integration of engrave CAD/CAM system.