Induction quenching machining method of Cr12 roller

Abstract

The invention discloses an induction quenching machining method of a Cr12 roller, and belongs to a roller quenching process. The induction quenching machining method comprises the following steps: (1)putting a roller to be quenched into a resistance furnace and preheating the roller to be quenched to 500 DEG C to 600 DEG C and performing heat insulation for a period of time; (2) enabling the roller to penetrate through a first induction coil at a certain motion speed and a rotation speed, preheating the roller to 780 DEG C to 900 DEG C and performing heat insulation for a period of time; (3)enabling the roller to penetrate through a second induction coil at the certain motion speed and the rotation speed, heating the roller to 960 DEG C and 1080 DEG C and performing heat insulation for aperiod of time; (4) performing air-cooling and pre-cooling on the roller and then performing water-cooling quenching; and (5) putting the roller into an air-circulation tempering furnace and performing tempering at a tempering temperature of 150 DEG C to 500 DEG C. According to the induction quenching machining method disclosed by the invention, uniformity and fineness of metallurgical structuresof the roller can be ensured, the hardness is qualified, and the labor strength is reduced.

Description

technical field [0001] The invention relates to the field of heat treatment technology, in particular to an induction hardening processing method for rolls. Background technique [0002] The roll body of the Cr12 roll of the small four-high rolling mill is required to have high hardness, deep hardened layer and high wear resistance; the roll neck is required to have low hardness and shallow hardened layer. In order to meet the requirements of use, they need to be heated and quenched separately. Cr12 mold steel shafts are mostly quenched in salt bath furnaces, requiring multiple salt furnaces for preheating and quenching. Due to the roll structure, it is too cumbersome for the salt bath furnace to heat the roll body and roll neck separately, the operability is poor, and the quality control is unstable; the heating salt bath furnace takes a long time to start and the efficiency is low. , the operation is labor-intensive, and the salt bath melting fume is generated, which pol...

AI Technical Summary

Problems solved by technology

Due to the roll structure, it is too cumbersome for the salt bath furnace to heat the roll body and the roll neck separately, the operability is poor, and the quality control is not stable; the heating salt bath furnace takes a long time to start and the efficiency is low, and the high temperature salt bath furnace needs to be slag removed many times during the operation process , the operation is labor-intensive, and the salt bath melting fume is generated, which pollutes the environment and affects the health of the operators; the entire operation cycle is long and the energy consumption is high; products of various specifications require multiple sets of tooling and lifting tools, and the consumption of auxiliary tools is large; salt When the bath is started, the electrode is seriously worn out, the breakdown is frequent, the cost is high, and the efficiency is low. It is not suitable for continuous quenching of rolls with multiple batches and specifications.

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