Parametric Design And Flow Field Analysis Of Pipe Die For Extrusion

Because many pipes made of traditional materials are placed by plastic pipes which can be functionally designed and used in many ways. Applications of plastic pipes in many new fields are constantly increased. Therefore, it is a significative project to do some theoretical research to the pipe dies for extrusion.During traditional design of pipe dies for extrusion, experiential method was often used, so that the great instability and unknowability in products and the big waste of manpower and material resources were usually resulted. The mandrel pipe dies for extrusion have the most extensive use. Although the specification of pipe dies is different, their typical flow channels are basically similar. Some research has been done in this article to find a new design method for this kind of die. A finite element analytical software (ANSYS) was used to analyze the flow field under different parameters. And the rule that different die parameters affected on the extrusion products was found. In this article, the parametrical mathematic model, physical model and finite model that adapted for the main performance indexes of pipe extrusion were developed. With the data of familiar extrusion plastics, the flow fields and the flow process in the flow channel were calculated and simulated. Accoding to the gained velocity and pressure fabric, fluids' flow mechanism in the flow channel was researched, and the effects of changes of many parameters such as geometical, material and processing parameters on the flow field's pressure and velocity fabric in the flow channel of pipe die for extrusion were analyzed and discussed.This research supplied a new way for the design of pipe die for extrusion. To realize the parametrical design of pipe die for extrusion, a parametrical design language with friendly graphic user interface (Visual C++) was combined with the APDL language (Ansys Parametric Design Language) provided by ANSYS software, and then the flow fields was analyzed. Finally feasible geometical sizes would be gained. This design method could save unnecessary costs and shorten the periods of design and manufacture.