PVC Sewer Pipe Production Line
Plastics extrusion is a high-volume manufacturing process in which raw plastic is melted and formed into a continuous profile. With the development of economy, more and more plastics are used in people's daily life. Consequently, a large quantity of plastic extruder, plastic extrusion line, plastic extrusion machine are used to process PP, LLDPE, LDPE, HDPE, PVC, ABS, etc. in pipe extrusion, profile extrusion, filament extrusion, film extrusion, sheet extrusion and pelletizing.
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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.