Method for automobile gearbox input shaft forging and blank rough machining forming

Abstract

The invention discloses a method for automobile gearbox input shaft forging and blank rough machining forming, and belongs to the field of metal mechanical part manufacturing. The method for automobile gearbox input shaft forging and blank rough machining forming comprises the following steps: 1, a blank is subjected to blank heating treatment and then is subjected to pre-forging and blank makingto form a pre-forged blank; 2, final forging forming is carried out on the pre-forged blank to form a forge piece blank; 3, after edge cutting treatment is performed on the forge piece blank, isothermal normalizing and shot blasting are carried out on the forge piece blank; and 4, numerical control machining is carried out on the forged piece blank for shot blasting to form an input shaft. According to the method for automobile gearbox input shaft forging and blank rough machining forming, vertical forging is adopted, and compared with a horizontal forging and wedge rolling technology, a blindhole can be forged, the material utilization rate is improved, a composite hole is conveniently machined in the later stage, and the drilling time of rough machining is saved.

Description

technical field [0001] The invention relates to the field of manufacturing metal mechanical parts, in particular to a method for forging an input shaft of an automobile gearbox and rough machining the blank. Background technique [0002] The input shaft of the automobile gearbox is a stepped shaft with a large deviation in the radial dimension of the large and small ends, and the large end has a composite hole. The input shaft blank is generally processed by forging forming process, so the rationality of the forging processing method has an important impact on the quality and production efficiency of the input shaft parts. [0003] Most of the existing input shafts adopt the forging method of direct forming by horizontal forging method or cross wedge rolling process. When the input shaft is directly formed by horizontal forging method, the forging is carried out from the middle of the forging. The above process scheme will produce flash, And the composite hole cannot be for...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing input shafts adopt the forging method of direct forming by horizontal forging method or cross wedge rolling process. When the input shaft is directly formed by horizontal forging method, the forging is carried out from the middle of the forging. The above process scheme will produce flash, And the composite hole cannot be forged, and the material utilization rate is low. At the same time, under the same cross-section, the grain size and hardness of the material at the parting surface and the non-parting surface have deviations, which may easily cause the follow-up spline at the input end to run out of tolerance. The problem

When the input shaft adopts the forging method of direct forming by cross wedge rolling process, the blank is rolled into stepped shafts of various shapes under the action of the wedge shape. Although no flash will be generated, the composite hole cannot be forged. The utilization rate is not high, and the tissue fibers of the input shaft are poor, and the core of the input shaft will have serious defects such as looseness or hollowness.

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