EFGM Research And Application Of Hot Forging Of Bearing Positioning Sleeve

Forging is one of the commonly used methods of metal plastic forming processes,which can effectively optimize the microstructure and improve the mechanical properties of the metal.However,because of the high temperature and large deformation during the forging process,the analysis process is always complex.Especially for the die forging technology,the frequently used method such as testing and trimming models,which too much depends on experience,has its own drawbacks such as lower efficiency and higher defective index.With the continuous development of the mechanical industry,the traditional die forging technology is more difficult to meet the continuous improvement of production and quality requirements.In order to solve this problem,a large number of domestic and foreign experts put forward the idea simulating the forging process,trying to discover and solve the problem that is hard to discover in the trial.The simulation technology of die forging process has been developed in an unprecedented development with the development of computer technology,the rise of software engineering and the development of the nonlinear theory of finite element method.With the development of forging process simulation technology,it's hard to get accurate results in some complex plastic forging cases due to the limits of traditional FEM algorithm and mesh grids.Accordingly,many experts and scholars put forward the mesh-free method which is independent of the grid to simulate and analysis the large deformation of metal.After summarizing the research achievements of domestic and foreign experts,the present paper carried on a deep research on the mesh-free theory,and to solve the problem about partial insufficient filling during the bearing positioning sleeve forging process in a forging plant.In order to find the reasons for its insufficient partial filling problem,to analyze and optimize the wear condition of the molds.To established the theoretical basis how to improve the quality of the product and the forging process.The main research contents are as follows:Firstly,the research status and application of mesh-free method was analyzed in the field of metal plastic forming and its application prospect was presented as well.An actual part was determined as the research object;Secondly,the EFGM was studied in the following two aspects,1)the moving least square approximation,2)the processing method of the displacement boundary condition.The simple calculation and validation of the bending and tensile theory of the cantilever beam was used in order to prove the EFGM in the present research.Further,the basic theory of rigid plastic forming was analyzed,and the basic principle of velocity field and stiffness equation was explained.The algorithm flow was summarized and the 3D rigid plastic EFGM model was established.By the experiment and Simulation of flange forging process,verify the 3D rigid plastic EFGM analysis model.Finally,the reasons for partial filling insufficient was found by the experiment and simulation of the bearing positioning sleeve hot forging process.An improved solution was proposed.Then analyze and optimize the wear of the hot forging process of the die.