Manufacturing method of hot forming rim

Abstract

The invention relates to a manufacturing method of a hot forming rim. The manufacturing method comprises following manufacturing steps of A1, rim round pipe forming, wherein a metal plate is used for manufacturing a closed round pipe with the closed circumferential direction; A2, rim workblank forming, wherein the closed round pipe is manufactured into a rim workblank with the diameter smaller than the rim designed diameter; A3, rim workblank pre-expanding, wherein the rim workblank is subject to pre-expanding, and the diameter of the expanded rim reaches 99.5% to 99.9% of the designed diameter; A4, rim workblank heating, wherein the rim workblank is heated to the designed temperature; A5, expansion finishing, wherein through the expansion manner, the diameter of the workblank reaches the designed size; A6, stamping and hardening, wherein the strength of the rim workblank is improved to above 1300MPa. Before heating, pre-expanding is carried out, the expansion amount during hot forming is reduced, the size precision of the rim is improved, and the expanding traces are reduced; the precision of out-of-roundness of the rim is improved; after heating, the manner of expansion finishing and stamping and hardening is adopted, and the forming precision and the forming strength are more effectively improved.

Description

technical field [0001] The invention relates to a method for manufacturing a wheel, in particular to a method for manufacturing a thermoformed rim. Background technique [0002] Both axial ends of the wheel rim are provided with rims, and when the tires are installed, the axial ends of the tires abut against the rims; a valve hole is also provided in the rim for passage of the valves when the tires are installed. For the rim, there are many manufacturing methods, for example, the Chinese patent No. 20081001205361, the authorized publication date is February 7, 2010, and the patent document titled "Aluminum Alloy Plate Wheel and Its Processing Method" discloses the Manufacturing method, but the wheel manufacturing method including the prior art of the above-mentioned patent has the following disadvantages: the molding quality is not high, which is mainly reflected in the low precision after molding, the low stability and easy deformation after molding, etc. Contents of the ...

AI Technical Summary

Problems solved by technology

For the rim, there are many manufacturing methods, for example, the Chinese patent No. 20081001205361, the authorized publication date is February 7, 2010, and the patent document titled "Aluminum Alloy Plate Wheel and Its Processing Method" discloses the manufacturing method, but the wheel manufacturing method including the prior art of the above-mentioned patent has the following disadvantages: the molding quality is not high, which is mainly reflected in the low precision after molding, the low stability and easy deformation after molding, etc.

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