Experimental study on semi-precision forging of double gears Xu Shuqin, Chi Chengzhong (School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China). The two-color plastic mud was simulated on a 1000kN material strength testing machine, and the 20CrH steel was tested on a 10000kN friction press. The test results show that the semi-finishing process of the double gear is feasible, the mold design is reasonable, and the mold filling is good.
Fund Project: Research funding project for returned overseas students in Shanxi Province For a long time, gear teeth have been machined and formed, which wastes raw materials and requires a lot of machining time. In order to solve this problem, experts and scholars in the plastic forming industry have carried out a large number of studies on the selection of friction presses for more than 20 years, which can meet the requirements of machining allowance for subsequent machining. f responsibility editor Lu Xuemei) a series / w Lu Xuemei <. The model geometry used in the net simulation test is identical to the prototype. The simulation test was carried out on a 1000 kN material testing machine with a blank of Y 163 mm. According to the test record curve: stress; is the similarity constant of force; is the length similarity coefficient, taken here = 1. The deformation force can be given by the following formula: the values ​​of the corresponding parameters are brought into the above formula to obtain empirical formula estimation and simulation test. The predicted form load relative error is as high as 30%, which is mainly due to the fact that all parameters are taken at a safe value when using the empirical formula.
5 Production test Double gear production test process: band saw cutting, medium frequency induction heating, pre-forging, final forging.
Blanking specification: Y85mmX163mm pre-forging: 6300kN friction press, pre-heating of forging die, water-based graphite lubrication 000kN friction press, pre-heating of forging die, water-based graphite lubrication.
See the real photo of the precision forging. After testing, the forgings are well filled. 6 Conclusion The semi-precision forgings have reasonable tooth profile design, simple contour, convenient calculation and easy processing. The pre-forging die design of double gears is reasonable, which ensures the final forming of forgings; the lower end teeth of semi-finishing forgings The rough insertion volume is only 1/3 of the original forgings, which solves the "bottleneck" problem on the production line. The double-finishing semi-finishing process reduces the quality of the blank from 9.3kg to 8.1kg, which has good economic benefits.
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