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Theoretical study on precision forging of spur gear

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Theoretical study on precision forging of spur gear
Latest company news about Theoretical study on precision forging of spur gear

Chitkara N R et al. from college of Science and Technology, University of Manchester, United Kingdom, carried out numerical simulation analysis on the plastic forming of spur gear, and analyzed the deformation law of upsetting spur gear by using energy method and upper bound method. Dohamann F et al. used numerical approximation method and principal stress method to analyze metal flow and die stress in cold precision forging gear, and gave the normal stress distribution diagram along the profile of tooth surface. Korean scholars J.H.Song and Y.T. IM developed an auxiliary system of cold forward extrusion for spur gear, which can be used for gear forming according to the parameters of feeding gear. Kondo K and Ohga K proposed the gear split pressure forging method. Choi J C developed the split forging method and proposed the precision forging process of spur gear with inward split forming, and carried out two-dimensional finite element simulation analysis. Jongung Choi and Hae-Yong Cho et al. proposed a new dynamic tolerability velocity field of spur gear forging and studied its forming process in depth by upper bound method. The conclusion that the forming force is mainly related to the number of gear teeth was obtained. Yang D Y used rigid and viscoplastic finite element method to simulate the precision forging of spur gear. In 1992, KnoerrM used DEFORM to simulate the three-station hot forging process of circular gear billet, predicted the possible folding defects in the forming process, and improved the forming parameters according to the simulation results, and obtained the parts without defects. Th.Herlan of Germany uses finite element analysis method and ANSYS software to optimize the geometry of gear, so as to reduce the forging pressure and mold stress. The die force diagram analyzed by FEM is given and the gear shape is optimized. Finally, the fatigue test of precision forged gear is carried out and compared with the gear produced by traditional process.

 

Kou Shuqing et al. from Jilin University used finite element simulation theory and 3d forming simulation software to conduct a comprehensive study on gear cold precision forging technology, and applied elastic-plastic large deformation finite element numerical simulation analysis to spur gear cold precision forging process for the first time. Xia Shisheng et al. from Shandong University proposed a new process for forming spur gear from hollow blank: pre-forging split zone and split final forging. The numerical simulation was carried out by using 3D finite element numerical simulation software DeFORM-3D, and the forging load stroke curve and the stress, strain and velocity distribution of the whole forming process were obtained. Cheng Jun, Lin Zhiping et al used epoxy resin model to simulate 3d photoelastic test of precision forging concave die of spur gear. By processing the photoelastic image, the stress distribution of inner wall of precision forging concave die of spur gear was obtained. Zhang Zhimin et al. used three-dimensional large deformation elastic-plastic finite element method to simulate the forming process of two steps: closed upsetting extrusion and warm extrusion, radial diversion and constrained shunt, and obtained the stress distribution diagram and load-stroke curve of the new process. Numerical analysis results show that compared with closed forming, constrained shunt forming can obviously reduce the forming force, facilitate metal flow, ensure good tooth filling, improve the force conditions of die and improve the quality of forming parts. Update lee and others with the optimized die structure of the warm extrusion forming of spur gears is simulated, the results show that the people to die Angle is 180 °, extrusion tube diameter is equal to the spur gear addendum circle diameter, and chamfering at dedendum circle for the characteristics of the concave die form of tooth forming effect is good, this kind of concave die form to solve the problem of tooth shape corner filling dissatisfaction, It is very suitable for extrusion precision forming of spur gear.

Pub Time : 2021-11-04 10:35:30 >> News list
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