Research On Processing Method Of Rapid Prototyping

The Rapid Prototyping(RP) technology in which fabricates parts with accumulative method, is an important breakthrough in manufacturing technology field. It can automatically, directly, rapidly and accurately change the design thought of CAD prototypes into real prototypes or parts which have certain function, and that achieve rapid estimation, modification and functional test of parts design. Thereby, the technology can effectively shorten the period of research and development of products. But the precision of parts which manufacted by the RP machines is low, and because the volume of the RP machines is limited, many parts can't be finished directly. Based comprehensive analysis to factors of influence precision and for the aim of inclining error of principle—steps effect, studied part decomposing system. The system can increase precision and efficiency.The Rapid prototyping technology actuality in our country and abroad is analyzed first. This thesis made use of the methods of theory analysis and experiment, studied the influence of laser sintering parameters to machining precision, and the rule of the influence of sintering part precision was got through the analysis and study of experiment data and discussion of the formation reason of several disfigurements in sintering part. The measure and method of minimize the sintering disfigurement was presented, which could be a guidance to the application of laser sintering prototyping technology.The influence of layer thickness and part coordinate to precision and efficiency is great. After studying the influence, the relation between the part coordinate and slice thickness and surface roughness and manufacture efficiency is presented through experiments, which provide theoretical basis and experimental dependencies to choosing layer thickness and part coordinate.Studies the shortness of rapid prototyping system currently, proposes an algorithm of decomposing large and complex parts into smaller and simpler components which can be fabricated once. Because of considering the critical surface accuracy when decomposing, this algorithm can optimize the build time, the support volume and the surface accuracy. Developed part decomposing system on the UG environment through the GRIP programming language.It used easy human-computer interaction dialog box. Experiments prove that the enhancement of efficiency and precision of crucial surfaces is remarkable.