Vehicle bridge shell semi-housing mold method and special forming mold

Abstract

The invention discloses a half-housing molding method for automobile axle housing and a special-purpose forming die thereof. The method relates to the cold-roll forming of a selected steel plate in the forming die. The forming die comprises an upper die holder, a male die assembly, a female die assembly, a female die cavity plate and a lower die holder, wherein the female die assembly comprises two end female dies and an intermediate female die, the two end female dies are fixedly connected with the lower die holder and the intermediate female die can move up and down, the lower end of the intermediate female die is provided with an ejector rod. A half-housing blank is pre-treated by selection, lofting and layout and then directly subjected to press-forming in the special-purpose forming die. The method simplifies the half-housing manufacturing process of automobile axle housing, reduces manufacturing cost, shortens manufacturing period, increases production efficiency, reduces the investment for half-housing forming die, and improves the strength and bearing capacity of the automobile axle housing. The inventive method is suitable for half-housing molding of various automobile axle housings.

Description

1. Technical field [0001] The invention relates to a method for forming a semi-shell of an automobile axle housing, in particular a processing method for cold-bending a steel plate on a forming die, and also relates to a special forming die used in the method. 2. Background technology [0002] At present, there are three main methods of manufacturing automobile axle housings: one is the casting method, the other is the steel pipe bulging processing method, and the third is the processing method of heating the steel plate and then stamping and welding the axle housing twice. . Among them, the cast automobile axle housing structure was adopted earlier. This processing method is more polluting to the environment, and the weight of the axle housing is heavy, the process requirements are high, and there are casting defects (such as sand holes, slag inclusions, pores, etc.), and the wear resistance is poor. It is very easy to break; the steel pipe bulging processing method has hi...

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Problems solved by technology

[0003] 1. After the blank (thick steel plate) is heated above the critical temperature, the plasticity is greatly improved (facilitating the forming of parts), but the material strength is greatly reduced, thereby reducing the bearing capacity and service life of the automobile axle housing

[0004] 2. It takes about 5 minutes for each half-shell blank to be heated by intermediate frequency, which increases the production cost of parts

[0005] 3. After the blank is annealed at high temperature, the oxide skin is thicker and more, and the mold must be cleaned in time after each stamping to prevent the mold from being stuck or damaged, and the production efficiency is affected

[0006] 4. Due to the hot press forming, the temperature of the blank entering the mold is high, and the robot must be used to feed the material, thereby increasing the investment

[0007] 5. Due to the phenomenon of thermal expansion and contraction, the parts are wrapped on the punch after forming, and it is difficult to unload

[0008] 6. Due to the influence of the structure of the half-shell forming mold, two formings are required, and the investment in labor and molds is relatively increased

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