A heating process method for changing the back-up roll soft belt

Abstract

The invention discloses a heating process method for changing a soft belt of a supporting roll, and belongs to the technical field of heat treatment. According to a heating device structure of a differential temperature furnace of the heating process method, four rows of a plurality of tangential burners are arranged in a furnace shell, and a fiber sleeve is arranged between the supporting roll and the furnace shell. The heating process method comprises the steps that step 1, the differential temperature furnace is filled with the supporting roll, and a sheathed thermocouple temperature monitoring part is installed at the position, 80mm from the two ends of a supporting roll body to the end face of the roll body, of the supporting roll body; step 2, the end face of the fiber sleeve extendsmore than 50mm into the inner surface of the side end wall of the furnace shell, and the number of flames is determined according to the length of the surface of the roll body of a workpiece to be loaded into the furnace; step 3, adjustment is carried out for the first time, the small fire in the middle part remains unchanged, and the wind pressure of the small fire on both sides gradually increases from 1.0-1.5 mbar, the air pressure gradually increases from 1.5-2.0 mbar, the delta value is 1.1, and the big fire is not changed; step 4, the second adjustment is based on the first adjustment,the small fire to large fire state of the burners on the edge part is improved, the original air-fuel ratio is changed, and the delta value gradually increases from 1.0-1.2; and step 5, rotating is carried out for 15 seconds every 10 minutes, and rotating is carried out continuously for 30 minutes before discharging, spraying and quenching to ensure uniform heating of the periphery of the edge part.

Description

technical field [0001] The invention relates to a heating process method for changing the soft belt of a backup roll, which belongs to the technical field of heat treatment. Background technique [0002] After the back-up roll is tempered at differential temperature, the hardness difference between the middle part of the roll body and the side parts on both sides is relatively large, and the hardness of the two side parts is relatively low, resulting in soft bands. If the production control is not good, the range of soft belts on both sides is too large, which will result in unqualified products. Due to the different process methods, compared with advanced manufacturers of similar products abroad (such as JCFC in Japan), the level of control technology for soft belts of domestic back-up rolls is quite different. The proportion of unqualified products due to excessive soft belts in the back-up roll heat treatment is more than 80%, which has become a difficult problem in the ...

AI Technical Summary

Problems solved by technology

If the production control is not good, the range of soft belts on both sides is too large, which will cause unqualified products

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