Research On CAD System Of The Co-Extrusion Pipe Extrusion Die

Co-extrusion is a developing technique in the contemporary era. It is widely used in the field of plastic composite profiles processing. With the continuous extension of plastic pipe application field, co-extrusion technique plays a more and more important role in composite pipe and it also foresees huge potential and extensive perspective. How to get reasonable design of extrusion die for co-extrusion has become an increasingly imminent and needs to be resolved.With the rapid development of science and technology, Computer aided design has been becoming an advanced technology for mould designing in plastics industry. Widely used in designing field, CAD technology has made designing process develop towards the direction of high-automation, high-intelligence and high-integration. So great changes has made in the method of mould conventional plastic design and manufacturing, in other words, using CAD technology can decrease the cost of product and improve the efficiency of enterprise. Accordingly, it has become a trend that Chinese enterprises to apply Computer aided technology to mould designing.In this paper, according to the intimate understanding of the co-extrusion die design and the analysis of polymer melts co-extrusion flow, adopting secondly development technology of three-dimensional CAD soft, a parametric CAD system of the extrusion die for co-extrusion plastic pipe was built up. The system was developed by Visual Basic language on the base of the environment of Solid Edge, and includes data inputting modular, model establishing modular, assembly modular, project draft modular, check modular and standard part modular. In the system, parametric design method is adopted. In other word, changing a value of parameter, system will change automatically all dimensions related this parameter and follow constraint terms.The system has good functions of design calculation, model establishing, part...