Composite-material abrasive roller of tungsten carbide grain reinforced metal base and its production

Abstract

The invention is concerned with a kind of abrasive roller and production for tungsten carbide grain fortified metal base complex stuff. The abrasive roller is made up of matrix, complex layer and outside steel ring, and the complex layer is sintered with nickel base alloy and found WC grain. The powder of nickel base alloy has 0.7 to 0.8 percent of C, 3.5 to 4.5 percent of Si, 2.8 to 3.6 percent of B, 11 to 14 percent of Cr, and 35 to 40 percent of Fe, the rest is Ni. The granularity to powder of nickel base alloy is 105 to 140 micron, and the granularity of tungsten carbide is 1 to 1.5 mm,30 to 40 percent, 0.5 to 1mm,25 to 35 percent, 0.3 to 0.5mm,25 to 35 percent.This abrasive roller has better rigidity and tenacity than the one for cast iron with high chromium and alloy wire welding. This kind of abrasive roller is fit for middle speed concrete of power and concrete industry.

Description

technical field [0001] The invention relates to a wear-resistant grinding roller of composite material, in particular to a wear-resistant grinding roller of metal matrix composite material reinforced by tungsten carbide particles. The grinding roller is especially suitable for thermal power plants and medium-speed grinding rollers in impact environments. The invention also relates to the preparation method of the wear-resistant grinding roller, and this preparation method can also be used for the preparation of other wear-resistant parts. Background technique [0002] In coal, metallurgy, mining, electric power, building materials, refractory materials, energy and other industries, the pulverizing system uses a large number of grinding rollers, which are the main wear parts. The quality of its operation determines the economic benefits of the enterprise to a certain extent. The present invention is mainly developed for the grinding rollers of medium-speed coal mills in ther...

AI Technical Summary

Problems solved by technology

At present, the material of the grinding roller is mainly high-chromium cast iron. The blank cast by the integral casting process encounters many difficulties in the subsequent machining process. People often reduce the chromium content in order to meet the performance of easy processing, but the chromium content After the reduction, its hardness and wear resistance become worse, so there is a contradiction between the wear resistance and machining performance of the grinding roller

At the same time, the brittleness of high-chromium cast iron determines its poor impact resistance. The higher the chromium content, the better the wear resistance, the greater the brittleness, the lower the chromium content, the worse the wear resistance, and the better the toughness, so the impact resistance appears. Contradictions with wear resistance

Usually, the grinding rollers of the grinding system operate under a certain impact force. In addition, the coal quality used in thermal power plants in my country is quite different, causing the grinding rollers to fail when they do not reach the designed life. Grinding roller, its poor machining performance is not conducive to subsequent processing

Although surfacing welding can improve the service life, the surfacing welding equipment is expensive, and the surfacing welding once will not increase its service life much. At the same time, the frequent replacement of the grinding roller in the power plant needs to be shut down, causing great economic losses.

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