Theory And Experimental Study On Prestressed Belt Grinding Of Titanium Alloy

Because of high strength, good corrosion resistance, high heat resistance, titanium alloy has been widely used in aerospace, shipbuilding, high-speed rail and other fields. With the development of aerospace technology, higher requirements of the key titanium alloy components have been put forward. The high-service, high- strength and high-reliability of titanium alloy parts become the focus of research. Long-term research and practice show that the life and reliability of components and parts surface residual stress has a close relationship. The residual stress on the surface of the conventional machining is basically a tension stress state, which has an adverse effect on the life and reliability of the parts. Therefore, it is of great significance to study the influence of residual stress on the surface residual stress in the process of machining. Abrasive belt grinding is a flexible grinding, and abrasive belt grinding get widely used in aero engine blade, casing processing because that it can obtain better surface quality. Although grinding can be formed on a surface residual compressive stress state, but still exist insufficient in high service.Therefore, in this paper,prestress state of abrasive belt grinding process is put forward in combination with conventional abrasive belt grinding on the characteristics of flexible grinding to control and formation of titanium alloy surface residual should beat stress state, the fatigue life of the better improve the titanium alloy parts. This paper will carry out the following work:Based on the theoretical analysis of the prestressed abrasive belt grinding of titanium alloy finite element simulation model of prestressed abrasive belt grinding of titanium alloy is set up. Through numerical simulation, prestress research, belt line speed, grinding pressure process parameters on the surface residual stress distribution of the influence law of the state.On the basis of the above theoretical research, a set of prestressed loading device is developed, and the experimental scheme is designed according to the CCF response surface test method to provide the basis for the Ti-6Al-4V prestressed grinding experiment.The grinding experiments were carried out in prestressed grinding experiment platform on the existing. Through X-ray diffraction analysis and calculate the residual stress on the surface of size. Analysis prestressed, belt line speed and grinding pressure on surface residual stress distribution of accuracy, validate the simulation model. On the basis of, response surface test method to establish surface residual force prediction model based on, for the future of prestressed abrasive belt grinding of titanium alloy provided experimental guidance.