A Cold Extrusion Overflow Forming Process for Oil Pump Cover Plate

Abstract

The invention discloses a cold extrusion overflow forming process of an oil pump cover plate. The process comprises the following steps: 1) the unloading, the annealing, the shot blasting and the surface lubricating treatment are performed on a blank in sequence; and 2) the blank is put in a mold for one-step formation of cold extrusion and overflow to produce an oil pump cover plate forging with a spiral oil groove in one surface, a deep groove on the other surface and a flange at the peripheral edge. The adopted mold comprises an upper mold, a lower mold and an ejecting rod, wherein the upper mold comprises a punch; an overflow groove is peripherally formed in the outer wall of the end part of the punch; the lower mold comprises an outer ring, an inner ring, an outer mold core and an inner mold core in interference fit in sequence; the inner mold core comprises an inner mold core base, and multiple inserts inserted in the inner mold core base; the ejecting rod is in interference fit with the inner mold core base, and is used for ejecting the formed oil pump cover plate forging; and after the upper mold and the lower mold are closed, a molding cavity matched with the oil pump cover plate is formed. The split mold is adopted to realize one-step cold extrusion formation; and meanwhile, the overflow formation is matched to greatly prolong the service life of the mold.

Description

technical field [0001] The invention relates to the technical field of cold forging precision forming, relates to a cold extrusion process, in particular to a cold extrusion overflow forming process of an oil pump cover plate. Background technique [0002] The oil pump cover is a common engine accessory, which mainly provides sufficient fuel for the engine to work, and has high requirements for hardness and strength. Since the shape and inner cavity of the oil pump cover plate are different shapes, the forming process is more complicated. The life of the traditional monolithic die is extremely unstable, so it can only be made multiple times (that is, multiple times after pre-forging and distribution of materials). Although the early failure of the die is delayed, expensive intermediate processing costs are generated, such as : Intermediate softening and lubricating treatment after multiple moldings. In addition, the complex process leads to a long production cycle, more pr...

AI Technical Summary

Problems solved by technology

Since the shape and inner cavity of the oil pump cover are both different shapes, the forming process is more complicated

The life of the traditional monolithic die is extremely unstable, so it can only be made multiple times (that is, multiple times after pre-forging and distribution of materials). Although the early failure of the die is delayed, expensive intermediate processing costs are generated, such as : Intermediate softening treatment and lubrication treatment after multiple molding

In addition, the complex process leads to a long production cycle, more process monitoring, takes up a lot of manpower and material resources, and makes management very inconvenient

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