Preparation method of large abrasion-proof hollow grinding ball

Abstract

The invention discloses a preparation method of a large abrasion-proof hollow grinding ball, and belongs to the technical field of metal abrasion-proof materials. The preparation method comprises the following steps: step 1, preparing a casting shape, wherein an air extraction support mechanism is prearranged in the core part of a foam plastic die sample, and comprises a support part and an extraction branch tube; step 2, performing a smelting process, wherein pouring molten steel comprises the following components in percentage by mass: 0.3-0.5% of C, 0.5-1.5% of Si, 0.5-2% of Mn, 1.0-3.0% of Cr, 1.0-3.0% of Ni, 0.5-2% of Mo, 0.24-0.32% of B, 0.28-0.35% of V, 0.08-0.13% of Ti, 0.8-1.2% of rare earth, less than or equal to 0.02% of P, less than or equal to 0.02% of S, the balance being Fe and inevitable impurities, and C% is equal to 1.2*B%+(0.06 to 0.13); step 3, performing a pouring process; and step 4, performing heat treatment. Through the preparation method of the large abrasion-proof hollow grinding ball, the problems of poor tenacity of the hollow grinding ball, the offset of a conventional sand type casting sand core and uneven ball wall can be solved.

Description

technical field [0001] The invention belongs to the technical field of metal wear-resistant materials, and more specifically relates to a preparation method of a large-scale wear-resistant hollow grinding ball. Background technique [0002] The EM medium-speed mill is a medium-speed ball mill produced by the British B&W company. It was introduced into my country from abroad in the early 1960s. At the end of the 1990s, my country developed a domestically produced EM-type medium-speed mill on the basis of introduction. Now it has become a national standard. Main grinding equipment for power and mining industries. The main grinding principle is that the balls roll between the upper and lower rings to crush the minerals that enter the grinding path, so the balls and rings are the main wearing parts. According to the size of the equipment, 5 to 10 grinding balls are usually placed. my country developed its own EM type medium-speed grinding balls on the basis of introducing grindi...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems in the prior art that the comprehensive performance index of hardness and toughness of the large hollow grinding ball is relatively poor, and the large deviation of the wall thickness of the large hollow grinding ball cannot be well controlled, and provides a large wear-resistant hollow grinding ball. The preparation method of the grinding ball adopts the technical scheme of the present invention, which can improve the toughness of the large hollow grinding ball and ensure its performance, and the deviation of the wall thickness of the large hollow grinding ball can be successfully controlled within ±3%.

Images