Improved roller double-frequently quenching process

Abstract

The invention discloses an improved roller double frequency quenching technique. A roller which is vertically hung on a quench machining tool sequentially passes through an upper sensor and a lower sensor from top to bottom; then, a sprinkler positioned under the sensor is used for quenching and cooling the roller; the heating-up temperature (TA) of the upper sensor is slightly higher than the heating-up temperature (TC) of the lower sensor, so that the temperature distribution tend to be reasonable, and the distance between the upper sensor and the lower sensor can be enlarged, thus being beneficial to full austenization and deep level heat permeating.

Description

technical field [0001] The invention relates to an improved double-frequency quenching process for rolls. Background technique [0002] The cold rolling roll is the main part of the cold rolling mill. Due to its harsh working conditions, high requirements are placed on its various properties such as the hardness of the roll surface, the uniformity of hardness and the depth of the hardened layer. Cold rolls are usually made of high-carbon chromium (Cr) series alloy tool steel, and meet the necessary performance requirements through strict smelting, forging and heat treatment processes. Quenching of the roll body is the most critical process. [0003] At present, the advanced cold roll quenching method is the dual-frequency induction heating quenching method. This quenching method solves the problems of large energy consumption, low roll surface hardness, and poor hardness uniformity caused by the roll salt bath and the overall heating and quenching method in the furnace. , ...

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Problems solved by technology

[0007] 2. The distance between the upper and lower sensors is relatively close, which is not conducive to deep heat penetration

[0008] Since the heating temperature of the upper inductor in the prior art is lower than that of the lower inductor, in order to prevent the temperature drop between the two inductors from being too much, the distance between the upper and lower inductors is relatively close (generally about 60mm), which is not conducive to fully optimizing the temperature of the sensor. Tempering and deep diathermy

[0009] 3. Improper coordination between quenching process and cold treatment affects the quenching hardness

[0010] The quenching process and cold treatment in the prior art are improperly coordinated, which affects the quenching hardness, and the highest hardness is generally ≤98HSD

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