Forging process for improving metallographic tissue of gear piece billet

Abstract

The invention discloses a forging process for improving the metallographic tissue of a gear piece billet; the process comprises the following steps that the billet is selected and a riser which is 30 percent of a total raw material is cut off; the billet is heated; then the billet is put into a forge press to be forged; during a whole forging process, according to the crystal segregation characteristics of each billet, force is applied in a direction vertical to the crystallization direction of the billet when the billet is hammered; limit broadening forging is carried out during the forging process, deformation is carried out within a limited extent in a direction during the forging, and the ratio of the residual thickness after pressing to the width after pressing of the limit broadening forging is 0.4; in the last time of heating during the forging, the final finish forging temperature is controlled on the premise of ensuring enough rest forging ratio; diffusion treatment for hydrogen and annealing are carried out on a forged and formed work piece; preparing heat treatment high-temperature positive tempering is carried out no the work piece which is subjected to diffusion treatment for hydrogen and annealing treatment after cooling; and the tempered work piece is detected. The metallographic tissue of the gear billet which is prepared through the forging process is more ideal.

Description

technical field [0001] The invention relates to a metal forging process, which belongs to the technical field of forging, in particular to a forging process for improving the metallographic structure of a billet of a gear piece. Background technique [0002] Different types of steel will be selected according to the strength of use, the location of use, and the importance of the gear, but the main difference lies in the content of alloying elements. In general, because the gear steel is in a long-term working environment, the performance requirements of many aspects are very high, which requires the forged gear blank to have good performance, and it is suitable for nondestructive testing The requirements for gear parts are also very high. Compared with ordinary parts, the mechanical properties of gear parts are many times higher. These problems have not been paid attention to, or have been paid attention to but there is no good way to solve them. Therefore, how to solve th...

AI Technical Summary

Problems solved by technology

In general, because the gear steel is in a long-term working environment, the performance requirements of many aspects are very high, which requires the forged gear blank to have good performance, and it is suitable for nondestructive testing The requirements for gear parts are also very high. Compared with ordinary parts, the mechanical properties of gear parts are many times higher. These problems have not been paid attention to, or have been paid attention to but there is no good way to solve them

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