A quasi-differential temperature heat treatment method for large-size rolls

Abstract

The invention relates to a quasi-differential isothermal heat treatment method of a large-size rolling roller and belongs to the technical field of heat treatment. The treatment method comprises the steps that a suitable chamber type electric resistance furnace is selected according to the size and the requirement of the rolling roller needing to be treated; after ceramic fiber is utilized for protecting the roller neck of the rolling roller, the rolling roller is fixed to a supporting pad workpiece in the chamber type electric resistance furnace; firstly, heating is carried out according to the first preset temperature rising rate until the first stage temperature is reached, and heat is preserved for first preset time at the first stage temperature; then heating is carried out accordingto the second preset temperature rising rate, after the quenching temperature is reached, the heat is preserved for second preset time, and then the rolling roller is discharged from a furnace; and after the rolling roller is discharged from the furnace, mist spraying cooling is carried out to the second stage temperature within 10 min, after spraying quenching is finished, blowing cooling is carried out with the first preset wind pressure, and after temperature return is finished and the temperature does not exceed the third stage temperature, the rolling roller can be loaded into the furnaceand tempered. According to the method, after quasi-differential isothermal heat treatment is carried out on the large-size rolling roller, while quenching of the surface of the roller body is completed at a certain thickness, the roller neck and the core portion still have a certain toughness treatment effect.

Description

technical field [0001] The invention relates to a quasi-differential temperature heat treatment method for large-size rolls, and belongs to the technical field of heat treatment. Background technique [0002] The roll relies on the neck to transmit the torque to drive the roll body to rotate, so as to roll the workpiece. It is required that the roll neck and the core of the roll body have a certain toughness, and the outer layer of the roll body is a working layer with a certain thickness and a certain strength. The traditional overall heat treatment can no longer meet the design requirements, and the differential temperature heat treatment should be born. However, the size of the inner chamber of the conventional differential temperature heat treatment furnace is limited, and the heat treatment of large-size rolls cannot be realized. The box-type resistance furnace has low requirements on the workpiece size, but how to ensure the effect of differential temperature heat tre...

AI Technical Summary

Problems solved by technology

Traditional overall heat treatment can no longer meet the design requirements, differential temperature heat treatment should be born

However, the size of the inner chamber of the conventional differential temperature heat treatment furnace is limited, and it is impossible to realize the heat treatment of large-size rolls.

The box-type resistance furnace has low requirements on the size of the workpiece, but how to ensure the effect of differential temperature heat treatment is a major technical bottleneck

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