Determination on Internal Pressure Loading Path of Hydroforming with Axial-circumferential Feeding for Heavy Truck Axle Housings
The deformation processes of hydroforming with axial-circumferential feeding were complex,and it was difficult to determine a reasonable loading path.The tube was prone to instability wrinkling and cracking in forming.Based on the deformation analysis,the variation laws of internal pressure for the deformation at typical positions in two stages of the hydroforming with axial-circum-ferential feeding were revealed,the loading path of linear pressurization—constant pressure—linear depressurization were determined,the calculation formula of internal pressure in each stage was de-rived,and the relationship between the plane height of upper control die and the maximum diameter expansion was given.For an axle housing of 10 t heavy truck,the finite element simulation of hydro-forming axial-circumferential feeding and the engineering tests were carried out,and the correctness of loading path was verified.The influences of the depressurization coefficient in the linear depressur-ization section of the loading path and the height coefficient of the upper control die on the forming quality of the tubes was revealed,and the reasonable ranges of both coefficient were determined.The risk of instability wrinkling and cracking is eliminated.
heavy truck axle housinghydroformingloading pathaxial-circumferential feedingpreformed tube with D-shaped cross-section
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