Method for preparing roll ring for rolling mill and roll ring prepared by the method

Abstract

The invention relates to the field of preparation of rolling mill equipment, in particular to a preparation method of a roll collar for a rolling mill and aims to improve the rolling quality and the rolling efficiency of a wire and rod rolling mill and reduce rolling costs. The preparation method comprises steps as follows: a roll collar base body and a roll collar sleeve are prepared, the roll collar base body is arranged between the inner side wall and the outer side wall of an annular cylinder of the roll collar sleeve, a powder accommodating channel is located above an accommodating cavity in the roll collar sleeve, compaction operation is performed after the alloy powder is injected, and a top cover is mounted at the top of the powder accommodating channel; the roll collar sleeve with the roll collar base body and the alloy powder inside is put into a degassing furnace to be vaccumized and subjected to degassing thermal insulation and then is put into a hot isostatic pressure furnace for hot isostatic pressure treatment; the roll collar is obtained after the roll collar sleeve is removed, and the roll collar is sequentially subjected to annealing treatment, quenching treatment and tempering treatment. The roll collar prepared with the method has better wear resistance and long service life, and the thickness of a work layer is uniform.

Description

technical field [0001] The invention relates to the field of preparation of rolling mill equipment, in particular to a method for preparing roll rings for rolling mills. Background technique [0002] Roller rings are key components in wire and bar mills for rolling wire and bars. In the rolling process, the surface of the roller ring needs to withstand high temperature and high pressure. Therefore, in order to reduce the consumption of the roller ring in production, not only the roller ring must have good fracture resistance, but the surface of the roller ring must also have Good red hardness, wear resistance and high hardness. With the increase of rolling speed, the working environment of the roll ring is more severe, and the performance requirements for the roll ring are also correspondingly increased, that is, the roll ring is required to have higher wear resistance, hardness, toughness and strength in a high temperature environment. It can be seen that the performance ...

AI Technical Summary

Problems solved by technology

Among them, the cemented carbide roll ring prepared by the powder metallurgy method has the characteristics of high hardness and good wear resistance, but the preparation cost of this kind of roll ring is high and the brittleness is high. During use, it will peel off and affect the rolling effect. Manufacturing quality

The high-speed steel roller ring prepared by centrifugal casting method has a simple preparation process and less equipment investment, so the preparation cost is low, but due to the large difference in the density of alloy elements and corresponding carbides, serious segregation will occur during centrifugal casting , leading to the lower wear resistance of the prepared high-speed steel roll ring, which consumes a lot during use, which affects rolling efficiency and rolling cost

It can be seen that the existing roll rings either have high manufacturing cost and high brittleness, which affects the rolling quality; or have low wear resistance, which affects the rolling efficiency and rolling cost.

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