Research Status And Numerical Simulation Of Precision Forging Process For Spiral Bevel Gear

The load-carrying capacity and smooth transmission performance of spiral bevel gear are much better than that of straight bevel gear, it can meet the requirements of high-speed heavy transmission very well. Its significant performance also prompts researchers to study its design and processing technology in depth. With the maturity of precision forging technology for straight-tooth bevel gear and its wide promotion and application in the world, people pay more and more attention to the precision molding of spiral bevel gear. The traditional gear processing method damages the metal fiber flow line organization, reduces the bending and fatigue strength of the root of gear tooth, and tooth surface abrasion etc. It also results in low productivity, low material utilization, and high production costs as well. Therefore, precision forging replacing the existing milling process is one of the most important means to achieve precision shaping of spiral bevel gear.This paper studies the forging process of driven spiral bevel gear, and makes numerical simulation analysis of its precision forging process. Firstly, an isothermal compression test for gear steel 20CrMnTi is taken, the thermal compression deformation law is analyzed, the impact of deformation rate, deformation temperature on its compression flow stress and organization is discussed and the deformation resistance model is established. Then, the modeling of die structure and forging of driven spiral bevel gear is taken place by the use of three-dimensional software UG, three-dimensional rigid-plastic finite element simulation of precision forging process is carried out by the use of simulation software DEFORM, and the forming process of driven spiral bevel gear, the law of tooth deformation, stress distribution, strain distribution, the force and energy parameters are analyzed. At the same time, the situation of tooth filling is analyzed on the condition of influencing factors such as different friction coefficient, different forming temperatures, different forging sizes and so on. This paper also carries out physical simulation experiments for driven precision forging of spiral bevel gear, analyzes the law of tooth filling metal flow and verifies the feasibility of the precision forging of spiral bevel driven gear and the correctness of numerical simulation. Finally, according to the results of numerical simulation and physical experiments the precision forging parameters of driven spiral bevel gear are optimized and put into practice, the correctness of the optimization results is also tested.