High Temperature Plastic Deformation Mechanism And Numberical Simulation On Titanium Rotary Piercing

Titanium is an important strategic resource. And advanced titanium industry is an important indicator of overall national strength. So developing the titanium industry in consolidating national defense and national economy is of great strategic significance.Various forms of titanium products have been widely used in various fields of high technology and occupies a pivotal position in the national life. Titanium alloy seamless tube is one of titanium industrial products. Billet preparation is the first step of the production of seamless pipes, which is the most important process. Cross-rolling piercing is an effective method for the preparation of titanium wool tube, due to its high production efficiency and low consumption of the metal mold. However, in titanium alloy rotary piercing process, the processing technology of titanium alloy is very harsh due to its high deformation resistance and strong work hardening.In this paper, the TC4 titanium alloy tube billet material of one titanium alloy seamless steel pipe factory is the research object, isothermal compression experiment of this alloy is operated on the Gleeble-3800 thermal simulation experiment machine.Different deformation conditions have been played on the TC4 titanium alloy to study and analyze its high temperature deformation behavior and the influence of the flow stress.The new type of the TC4 titanium alloy’s high temperature creep stress model was built according to the measured data.Then, the research, based on the process problems of the TC4 titanium alloy tube billet skew rolling punch, with a simulation platform of the finite element simulation software DEFORM-3D, using the methods of single factor rotation, analyzed three important process parameters(speed, billet temperature and head forward amount) to find their impact on the tube temperature, force and energy parameters and capillary influence of dimensional accuracy of TC4 titanium alloy rotary piercing process. The analysis results of this paper provide an important theoretical and practical value to optimize the production process and to improve the quality of products.