Papers by Author: G. Y. Zhang

Abstract: A FEM-numerical simulation system is developed to simulate the process of rotary draw bending of tube. The emphasis is to discuss some factors such as tube materials, bending moment of fan-shaped die, pushing force of sliding slot and tube relative bending radius which have an effect on tube bending quality. The quality parameters of ovality, thinning ratio and thickening ratio are the same as the measurement values in the practical production. Some improved methods are put forward to according to the simulation results. The experiment shows that the simulation system can forecast accurately the deformation in the process of tube bending, so the production manufacturing cost decreases greatly.

Abstract: The numerical simulation method is used to solve the problems of pipe bending manufacturing such as die with fine cracks, ovality of pipe. The fan-shaped die is welded with steel plate in circle and rib in radial direction by the analysis of structural deformation. The optimal design is provided with ovality of pipe as object variable and sliding slot dimensions as design variables. Compared with experiential shape groove of slot, ovality of optimized slot decreases about 10.5% in average. It greatly reduced the production cost using computer simulation method to replace a lot of experiment improving tube-bending production.