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Study on the technology of precision forging spur gear
1987 British University of Birmingham tuncer C proposed floating die forging hollow thought, and summing up the flash forging die manufacture and use of various process points, all kinds of mold is designed. Nagai y the preformed cups as some cylindrical gear cold forging billet measures through drawing, shaping, thin drawing and compression of the four steps for implementation with a larger sink hole of the cylindrical gear cold forging forming. Modarxes and Tarbiat of the University of Birmingham in Iran M.H.Sadeghi and the T.A.Dean of the have been systematically studied. The influence factors of the mold structure, the size of the gears, the prediction of the plastic forming force, the relationship between the friction coefficient, the modulus and the width, the relationship between the release force and friction coefficient, forming force, forming temperature, pressure angle and number of teeth. The Herlan Th. of Germany takes the material as an example of the 20MnCr4's straight bevel gear. The process of warm forging and cold forging is adopted. The process flow is: induction heating (850) - forging, hardening treatment, and hardening. Firstly, the initial bar heating, upsetting, shot peening and heated to 850 DEG C, send to 12.5mn mechanical press forging, after shot peening and surface phosphating, saponification treatment. Finally, in 12.5mn hydraulic machine were cold forging, and gives the cold forging mould diagram.
Shandong University of Qing Ping Zhang et al on two steps forming straight tooth cylindrical gear cold precision forging process and die tooth profile design method were studied respectively by using the modified modulus method and displacement method on the final forging and pre forging die of tooth profile design. Qingdao Technological University of Tian Fuxiang Wang et al on precision forging spur gear heat the deep research and gives a quick shift gear forging forming in mold structure, discusses the problems related to the design, assembly and operation of the die and the die with strong demoulding device, the forgings after hammering moment immediately from the punch, solves the forgings will be the key technical problems of the mould locking. Zhang Zhimin, Zhang Baohong, et al. A new method is proposed, that is, the compound method of radial flow, warm forging and cold extrusion, and the accuracy of the gear can be reached by IT8. This new straight gear forming technology, can make the big modulus, gear tooth gear in the lower deformation force will be able to make the teeth full, its process is: the first form of the first use of the middle temperature forging, and then through the cold forming of high precision gear. Gear manufacturing by upsetting extrusion, in order to avoid gear in plastic forming in the process of defects, and puts forward a new radial forming technology, in the length direction of the mold design of large deflection angle, the deflection angle billet is pushed along the slope of pressure. At the same time, metal radial flow, at the top of the gear teeth at the bottom of the residual metal flow gear gear is packed with shaped. Feng Chongqian based on straight tooth cylindrical gear upsetting squeeze forming process of experimental study, for the straight tooth cylindrical gear precision forging forming process technology proposed a new forming processes, floating die upsetting extrusion forming process, and to Anyang gear factory agricultural vehicle transmission gear as the research object design special upsetting extruding die, and the forming test, study the forming rules. In the process of forming a spur gear, the structure of the gear is analyzed, and the feasibility of the technology is verified by the analysis of the microstructure of the gear formed by Zhao Jun et al. Jiang Ying, et al. Use rolling equipment to carry out the research on the gear, the only need to replace the roller, it can be used in the process, the small modulus of cylindrical spur gear, cylindrical helical gear, the process is simple, the production efficiency is high, the processing quality is good.