Research On Correlative Technology Of PP-R Pipes Injection Mold Design

This paper analyzes the manufacturing problem of widely used PP-R pipes with thick walls. Employing mould CAD/CAM/CAE technology, the method of the design of injection mold of PP-R pipes based on Pro/E is presented, and an application programme under Pro/E used for the design of injection mold of PP-R pipes is developed.This paper first introduces the characterization of injection mold and its important status in the modern industry, present situation and trend of CAD/CAM technology of injection mold. It illuminates that the specialization of the design and manufacturing of mold and second development of CAD softwares are importent to improve mold quality and manufacturing efficiency, to reduce cost and to shorten mold manufacturing periods.This paper gives method of the design of injection mold of PP-R pipes based on Pro/E, and makes an application programme development under Pro/E used for the design of injection mold of three-way pipes on the basis of knowledge with the application development interface Pro/TOOLKIT to solve the problem of the PP-R pipes with serious seams. By using the software the designers can query the knowledge in storage when they are designing PP-R injection mold, and the time required for querying in design is reduced. As to the PP-R pipes with thick walls in which serious seams are found because the pouring system is not properly designed, the software can help the designer decide whether the sizes of the flow path and pour meatus of the injection mold need to be calculated. If they're needed, as long as the corresponding parameters are input, it will calculate the sizes of the flow path and pour meatus of the injection mold designed for the thick-wall PP-R pipe. Thus we can reduce the repair rate and greatly improve the mold design level, and the quality of PP-R pipe.By using the method of the design of injection mold of PP-R pipes based on Pro/E, an injection mold of DN30 three-way PP-R pipers is tested. The process of the the design of injection mold of PP-R pipes with the method is introduced, and it is proved that the method is feasible.