Roll surface material of high-pressure roller mill for crushing ore and preparation method of roll surface

Abstract

The invention belongs to the field of mining machinery and in particular relates to a roll surface material of a high-pressure roller mill for crushing ore and a preparation method of the roll surface. The roll surface material comprises the following chemical components in percentage by weight: 1.0%-3.0% of C, 2.0%-10.0% of V, 2.0%-10.0% of Mo, 2.0%-7.0% of Cr, 0.3%-6.0% of Nb, 0.1%-3.0% of Ti, 0.7%-1.0% of Si, 0.5%-1.0% of Mn, 0.1%-0.7% of Ni, 0-0.02% of P, 0-0.01% of S and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: firstly smelting molten steel, and molding a high-alloy steel roll surface by centrifugal casting in one step; cooling a casting to room temperature; then carrying out a heating treatment process on the casting; adjusting the rigidity of the roll surface to about 50 HRC; processing blind holes in the roll surface in the manner of staggered distribution; carrying out heat treatment under protection atmosphere; then embedding sintered carboloy studs into the blind holes to obtain a highly wear-resistant composite roll surface. The roll surface material of the high-pressure roller mill is uniform in texture, and a final roll surface has stable strength and wear resistance and longer service life.

Description

technical field [0001] The invention belongs to the field of mining machinery, and in particular relates to a high-pressure roller mill roll surface material and a roll surface preparation method for crushing ore. Background technique [0002] In mining machinery, due to the high-pressure roller mill has the advantages of high single machine output, long roller surface life, high operating rate, good reliability and low unit energy consumption, it soon received attention from the field of mining machinery and gradually became the main tool for crushing ore. means. However, in the application process of high-pressure roller mills, there are still many problems to be solved due to the harsh actual working conditions. Among them, the high-pressure roller is the key part of the high-pressure roller mill. The roller surface bears huge normal extrusion force and large tangential friction force during work, which easily leads to serious wear of the roller surface, and the quality ...

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Problems solved by technology

This composite roll surface material mostly uses high chromium cast iron or bainite ductile iron as the matrix, but the problem encountered is that the material's compressive strength and wear resistance are insufficient, which has a great impact on the quality of the roll surface of the high pressure roller mill. influences

The use of high-alloy steel as the material of the roll surface has sufficient compressive strength and wear resistance, but it is easy to cause uneven composition and easy accumulation of carbides when pouring large castings, resulting in poor strength, hardness and wear resistance of the final roll surface. Uniform; In addition, when the high-alloy steel roll surface is inlaid with studs, the hardness of the roll surface is too high. Blind hole processing is difficult and time-consuming, which seriously affects production efficiency

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