Expanding and pressing forming method of middle bridge bag belt upper and lower platform type automobile axle housing

Abstract

The application provides an expansion forming method for an upper and lower platform type automobile axle housing with a middle axle cover, and comprises the following steps: S1: a seamless steel pipe is reduced in diameter at both ends and then is formed into a preformed pipe blank through a middle hydraulic expansion, so that a preformed pipe blank with an upper and lower concave inner column is formed, wherein the upper and lower parts of the preformed pipe blank correspond to the upper and lower platform positions of the middle axle cover; S2: the preformed pipe blank is reversely pressed in an alternating feeding and clamping mode to form an axle housing product with an additional front cover, wherein the reverse pressing process is controlled according to a multi-segment linear curve; and S3: the additional front cover is cut off, and other features are manufactured on the remaining axle housing product to obtain an axle housing product. The application realizes that the size of the small round corner on the additional front cover side of the upper and lower platform section of the middle axle cover is appropriate, the outer end vent hole and the area near the oil drain plug hole are well attached to the mold, and the problem of large size difference between the round corners on the rear cover side and the additional front cover side of the axle housing is solved.

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