A kind of preparation technology of shaft forging for vertical forging

Abstract

The invention discloses a preparing technology for vertically forging a shaft forge piece and belongs to the technical field of forging. According to the preparing technology for vertically forging the shaft forge piece, compared with flat forging in the prior art, the gravity of a forging hammer can also be included in stress through a vertical forging mode, the stress is more concentrated, the forging efficiency can be effectively improved, more target shaft forge pieces can be forged in the same time, and the mechanical performance of the target shaft forge pieces can also be greatly improved; meanwhile, by forming a die cavity larger than a target shaft, a crack eliminating layer is formed on a formed preliminary forming piece, so that cracks generated in forging can be effectively transferred in a concentrated mode to be shown on the crack eliminating layer, the number and size of surface cracks of the target shaft forging pieces in a later stage are effectively reduced, and the quality of the target shaft forging pieces is further improved; and furthermore, under the action of duplicate imprinting grooves, the situations that the mark eliminating layer is excessively or insufficiently polished can be effectively reduced, and thus the finished quality of the target shaft forge pieces can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of forging, and more specifically, relates to a preparation process of a vertically forged shaft forging. Background technique [0002] Forging is a processing method that uses forging machinery to apply pressure to metal blanks to cause plastic deformation to obtain forgings with certain mechanical properties, certain shapes and sizes. It is one of the two major components of forging (forging and stamping). Forging can eliminate defects such as as-cast porosity produced in the metal smelting process and optimize the microstructure. At the same time, due to the preservation of complete metal flow lines, the mechanical properties of forgings are generally better than castings of the same material. For important parts with high loads and severe working conditions in related machinery, forgings are mostly used, except for plates, profiles or weldments that can be rolled with simpler shapes. [0003] According ...

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Problems solved by technology

[0008] Generally, smaller shaft forgings are manufactured by die forging, but in the later stage of forging, especially for shaft forgings with different diameters, there will be turning points at the corners of two different diameters, and the turning point is in line with the inner wall of the mold. At the contact point, due to the air and the smoothness of the inner wall of the mold cavity, it is easy to generate small cracks, which will cause the cracks to gradually increase after being subjected to a bias force when the target shaft forgings formed in the later stage are used. Breakage is very easy to occur at the turning point, which affects the service life of the finished forging

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