High-speed steel combined roller and manufacturing method thereof

Abstract

The invention discloses a high-speed steel combined roller and a manufacturing method thereof. The high-speed steel combined roller is composed of a high-speed steel roller body and roller sleeves installed at the two ends of the high-speed steel roller body. A center hole and an annular groove are formed in the roller sleeve, and a wear-resistant layer is arranged in the annular groove in a laser cladding manner; the manufacturing method comprises the steps of manufacturing the high-speed steel roller body, manufacturing the roller sleeve and installing. The roller sleeve manufacturing comprises the steps of roller sleeve blank manufacturing, center hole machining, thermal refining, annular groove machining, overall preheating and wear-resistant layer laser cladding. The roller sleeve of the high-speed steel combined roller adopts 42CrMo steel as a base body, and the wear-resistant layer is cladded on the end face of the base body, so that on one hand, the roller sleeve can still have very high hardness at the temperature of 650 DEG C or above, the sensitivity of forming hot cracks on the end face of the roller sleeve is greatly reduced, and the problem of cracking of a central hole in the end face of a roller neck of a high-speed steel roller can be solved; and on the other hand, the wear resistance of the end face of the roller sleeve is greatly improved, fatigue cracks are effectively delayed, and the service life of the roller sleeve is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of high-speed steel rolls, and in particular relates to a high-speed steel composite roll and a manufacturing method thereof. Background technique [0002] With the development of the automobile industry, the demand for high-strength steel and ultra-high-strength steel plates is becoming more and more extensive. Compared with ordinary carbon steel, high-strength steel has many types and high content of alloying elements, and there are many accidents such as broken strips in the rolling process, which puts forward higher requirements for the hardness, wear resistance and accident resistance of the roll. Conventional MC3, Rolls made of MC5 and other materials cannot adapt to the rolling conditions of high-strength steel and ultra-high-strength steel. [0003] Due to the high-speed steel roll contains a large amount of alloy elements such as W, Cr, Mo, V, etc., it has good hardenability, and it still has a mat...

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Problems solved by technology

[0006] The shortcomings of this document are: (1) The roll sleeve is made of low-carbon steel, whose wear resistance is lower than that of the high-speed steel roll body. In this way, the end surface of the roll neck and the thrust bearing are prone to fatigue cracks after long-term wear, which leads to the premature failure of the roll sleeve. fail

(2) According to the positional relationship between the end face of the roll neck and the thrust bearing, the area of ​​φ60mm in the center of the end face of the roll neck is theoretically a non-contact area. Abnormal contact occurs, resulting in abnormal wear in the φ60mm area of ​​the center of the roll neck end face, and even accidents such as roll body cracking caused by this

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