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Title:Hydroforming process on three-dimensional axis side-beam of rear subframe
Authors: Wang Na 
Unit: Shanghai Baosteel High-tech Auto Parts Co. Ltd. 
KeyWords: three-dimensional axis side-beam hydroforming rear subframe surface quality roughness 
ClassificationCode:TG394
year,vol(issue):pagenumber:2021,46(4):121-126
Abstract:

The whole process of tube bending, pre-forming and hydroforming of three-dimensional axis side-beam for rear subframe was analyzed by the nonlinear finite element analysis software AutoForm. Then, according to the geometric characteristics of part with asymmetric and unequal sections, the process parameters and loading path of part were determined, and the surface roughness defects of part during the pre-forming process were analyzed. At the same time, for the side-beam tube blanks with the wall thicknesses of 4.0 and 4.5 mm respectively, the consistency of hydroforming part profile was studied by the same tooling and die and different hydroforming process parameters. The results show that the maximum profile difference of side-beam part with the wall thicknesses of 4.0 and 4.5 mm under the internal pressures of 170 and 200 MPa respectively is ±0.3 mm, and the profile consistency is good. After the surface treatment test of nitriding and PVD on the pre-formed inserts, the surface hardness of inserts reaches more than 3000 HV, the friction coefficient reduces. The problem of rough appearance of part is solved effectively, and the surface quality of side-beam part is improved. Finally, the feasibility of using hydroforming technology to manufacture the three-dimensional axis side-beam is verified by experiments.

Funds:
AuthorIntro:
王娜(1979-),女,博士,工程师 E-mail:wangna@baosteel.com
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