Composite heat treatment method for corrugator roll

Abstract

The invention relates to a composite heat treatment device and a composite heat treatment method for a corrugator roll. The heat treatment method comprises a step of carbonitriding, a step of stress removal at a low temperature and a step of tooth surface supersonic frequency quenching. In the heat treatment method, the corrugator roll is subjected to carbonitriding at first, then undergoes stress removal at a low temperature and finally undergoes tooth surface supersonic frequency quenching. According to the invention, a deep hardened layer and a gentle hardness gradient are obtained; fatigue strength, especially rolling contact fatigue strength, of a workpiece can be improved, which is of practical significance to the corrugator roll which mainly bears rolling fatigue motion.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to a compound heat treatment device and method for corrugated rolls which combine several heat treatment methods. Background technique [0002] During the use of the corrugating roll, when the corrugated base paper is rolled and formed between the corrugated rolls, the base paper slides over the tooth tops of the corrugated teeth, there is relative movement, and the tooth tops are worn. There are three wear factors. One is that the minerals contained in the base paper rub against the top of the tooth along with the base paper; the other is the "acupuncture" effect of the hard particles mixed and embedded in the base paper, such as fine sand and dust, on the surface of the corrugated roller teeth. ; The third is that when the car is running empty or the paper is broken, the tooth surfaces of the two corrugating rollers are in direct contact, resulting in a metal-to...

AI Technical Summary

Problems solved by technology

[0003] The traditional single heat treatment process has the following problems: ①The hardened layer is thin and brittle, which is easy to cause friction and extrusion of the relative displacement of the top of the corrugated board during the high-speed ironing and bending forming process of the corrugated cardboard production line, making the top of the corrugated teeth Severe wear, gradually changing from a circular arc to a flat head, or pits and depressions on the corrugated surface, resulting in a short service life of the corrugated roller and poor economic benefits; ②The hardness gradient is steep and cannot withstand large contact stress and impact.

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