Quenching method for large shaft forgings with 3% Ni content

Abstract

The invention relates to a quenching method for large shaft forgings with 3% Ni content, which comprises the following steps: introducing quenching liquid into the bottom of a vertical spray quenching device to form a quenching liquid pool, the liquid level of the quenching liquid pool being located at a first process height; the shaft forgings are hung in the vertical spray quenching device, shaft bodies of the shaft forgings face downwards, and the lower end faces of the shaft bodies are higher than the first process height; quenching liquid is sprayed to the side wall of the shaft forge piece through a spray head of the vertical spray quenching device, the quenching liquid flows downwards to the quenching liquid pool after reaching the shaft forge piece, the liquid level of the quenching liquid pool gradually rises to the lower end face of a shaft body of the shaft forge piece, and the lower end face of the shaft body is quenched. Spray quenching and immersion quenching are combined, that is, the lower end face of a shaft body is immersed in quenching liquid while the side wall of the shaft forging is subjected to spray quenching, the lower end face of the shaft body can be effectively quenched, synchronous quenching of the outer circle side wall and the lower end face of the shaft forging is achieved, the quenching liquid can make effective and comprehensive contact with the lower end face of the shaft body, and the service life of the shaft forging is prolonged. And the quenching effect is better.

Description

technical field [0001] The invention relates to the technical field of quenching, in particular to a method for quenching large-scale shaft forgings with 3% Ni content. Background technique [0002] Forgings such as large rotors require chilling and cryogenic quenching to obtain high strength and plasticity, superior toughness, and low brittle transition temperature. Conventional quenching methods include immersion quenching and spray quenching. Immersion quenching refers to immersing parts in quenching liquid, and spray quenching refers to spraying quenching liquid to parts through nozzles. Generally speaking, the lower the temperature of the quenching liquid, the greater the cooling intensity, which will improve the quenching effect and performance to a certain extent. When the size of the workpiece is large, if immersion quenching is used, the temperature of the quenching liquid around the workpiece will rise rapidly, and the quenching effect will decrease. After the que...

AI Technical Summary

Problems solved by technology

This technology is only suitable for quenching small parts, not for large shaft forgings with 3% Ni content. Even if only the lower end of large shaft parts is put into the quenching liquid, a steam film will be formed on the surface of the lower end, and the steam film cannot be removed. affect the quenching effect

Images