A Method Of 3D Solid Modeling And Development Of CAD System For Sanitary Ceramic Products

With the progress of society and standard of living, it is the key of developing sanitary products industry that how to make sanitary products meet modem society at some aspects, such as variety, quality etc. Now. in China, the design of sanitary products depends on the experiences and skills of designer, this will take longer time and can't suit for the need of market. Moreover, there is no such commodity software in other countries. So. it will be of great significance in this profession to change the skilled manual design to CAD system with theory instruction.On the basis of research on the using of modern CAD technology and engineer analysis method at the design of sanitary ceramic products, according to the design character of sanitary ceramic products and the principia of reality-oriented and user-oriented, the design method of sanitary ceramic products are discussed and the whole design structure mode of sanitary ceramic products (SC-CAD) is presented. According to the complicated structure feature of sanitary ceramic products, 3D solid modeling technology based on the feature is introduced into the SC-CAD. The method of dividing sanitary ceramic products into some parts and the parametric modeling of each part in specific sequence is presented. The method of describing the arc with cubic Bezier curves is presented. In the program, the method of adjusting the curve by changing the control points is realized. On the basis of the analysis on the file structures of DXF, WRL and the way to display complicated curves in OpenGL, the arithmetic of reading the datum of triangle surface and the numeration of normalvector are presented. The method is of great value in virtual design and system simulation. Moreover, for fitting the development of modern computer technology, the thought of free design is discussed. The probability and some correlative technology about the SC-CAD structure based on agent are discussed. This structure can make SC-CAD have some capability of cooperated design.On the basis of analysis on some develop tools, using the O-O program design method, taking the VC++ as develop platform and ADSRX as develop tool, I successfully write the codes of some system modules. After the menu file structures of MDT3.0 are analyzed, the way to make and translate the interface of MDT system is presented. The SC-CAD developed by author is suitable for the design of sanitary ceramic products, it includes 3D solid modeling design (interaction modeling, parametric modeling), 3D model rendering. 3Dmodel to 2D drawing, 2D dimension, export drawing files, pipes" analysis and optimum design etc.This project has been expertized by experts of National Building Material Bureau(NBMB). The SC-CAD system is tested by XianYang Ceramics Research and Design Department, and the result is satisfied.