An eccentric shaft and its forming process

Abstract

The invention discloses a forming process of an eccentric shaft. The forming process comprises the steps that (1) according to the size of a forming blank of the eccentric shaft, an eccentric mould isprocessed, and the eccentric mould is internally provided with a large outer diameter end mold cavity and a small end mold cavity of the eccentric shaft of which the central axes are staggered; (2) acylindrical steel billet is forged; (3) the cylindrical steel billet is put into the eccentric mould and partially upset to the large outer diameter end; (4) the large outer diameter end is rounded after demoulding, and then an entrance die is upset in place. The forming process of the eccentric shaft has the advantages that the cylindrical steel billet forged simply, quickly and conveniently istaken as an object, partial upsetting is carried out on the eccentric mould to achieve one-time rapid forging and pressing forming of the large outer diameter end of the eccentric shaft and the smallend of the eccentric shaft, the entrance die is formed once in place, not only is the whole process simple, convenient and rapid, but also the working allowance can be greatly reduced, and the mechanical property of the eccentric shaft can also be ensured.

Description

technical field [0001] The invention belongs to the technical field of pin shafts, and in particular relates to an eccentric shaft and its forming process. Background technique [0002] Usually, the central axis of each diameter of the shaft is not on the same straight line, which is called the eccentric shaft. The eccentric shaft is generally fixed on the rotating shaft of the motor through the eccentric hole. When the motor is started, it performs a cam motion, which is widely used in automobiles, engines, pumps, etc. For the forged eccentric shaft blank, it is easy to have insufficient eccentric size of the forging, resulting in that the rough machining of the product cannot meet the requirements of the drawing, or the length of the small eccentric step of the forging product is too short, and the small step cannot be forged during forging; especially if figure 1 The eccentric shaft 1 shown has only a small eccentric step on one side, which is more difficult to forge dir...

AI Technical Summary

Problems solved by technology

[0006] Therefore, in view of the technical problems of large machining allowance, high overall cost and mechanical properties, especially the tangential mechanical properties of the large outer diameter end, in the forging of the eccentric shaft in the prior art, the purpose of the present invention is to provide a The eccentric shaft forming process can effectively reduce the machining allowance and cost, and at the same time can effectively improve the tangential mechanical properties of the large outer diameter end

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