Study On The CAPP Key Techniques Based On The Fuzzy Mathematics And UG/open For Shaft Parts

CAPP is the technology that uses computer to collect the manufacture informationfor generating the process technilogical planning of parts. It connects product designwith manufacture and has widely been used in the process of automatic production.Shaft parts are commonly used in modern mechanical products. The traditionalmanufacturing method of shaft parts is performed by concrete design and thenmanufacture. This leads to the long production cycle and low efficiency, thus, the oldmethod can hardly meet the need of product processing. Therefore, it is significant tostudy and find a generalized method for design and manufacture of shafts withhigher efficiency. In the line of manufacturing features, the paper profoundlydiscusses three key techniques in the design of processing planning: the subdivision,parametric design, and processing method selection, of the shafts. The study coversthe presence and development analysis of CAPP, definition and application ofmanufacturing features, advance and application of fuzzy mathematics, subdivisionwith the cluster analysis, parametric design based on the UG/open secondarydevelopment and the processing methods with fuzzy automata of the manufacturingfeatures. The main and core contents are as follows:1. Study on the subdivision method of shaft parts by use of the cluster analysis.Through identifying the information of parts’ manufacturing features and using thecluster analysis in the fuzzy mathematics with examples, and based on the machinetool, cutting tool number, and technical requirements in the real production, thesubdivision is done rapidly for similar shafts with a vaiety of thresholds.2. Study on the parametric modeling and system building by using UG/Opensecondary development platform. It is done with integration of the basicmanufacturing features into one shaft—virtual shaft, building of a3D shaft model asthe object of study. Using the tools of UG/open secondary development interfacesand Visual C++6.0programming, establish the system of parametric design for theshaft parts with rapid modeling and system building. 3. Study on the fuzzy automated determination of processing method based on themanufacturing features of the shafts. Through the analysis of the intension of themanufacturing features and selection of the characteristics index of themanufacturing features processing method, build the membership function ofprocessing method with manufacturing features. Based on the lattice degrees ofnearness and nearest principle, establish the processing method standard library forthe manufacturing features. And then taking the manufacture technical requirmentsas the restraints, obtain the optimal technolocical process. Finally，with VC++andthe object-oriented idea, achieve the fuzzy automation determination andoptimazation for the processing method of the shaft components.Experiment and simulation results show that the subdivision and the clusteranalysis are of accuracy and reliability for the similar shaft parts. The parametricmodoling of virtual shaft parts, based on UG/open secondary development, isinheritability and expandable; and the fuzzy comprehensive automatically identifysystem, has also been workable.