Molding technology for large hollow grinding ball

Abstract

The invention discloses a molding technology for a large hollow grinding ball and belongs to the field of metal wear-resistant materials. The technology comprises the steps as follows: a foamed plastic mold of the grinding ball is placed into a sand box; vibrating sand addition is performed on a vibrating unit; and the vibrating sand addition process is as follows: Stage 1: the vibrating frequency is adjusted, the sand box is vibrated at the low frequency, and dry quartz sand with the small granularity is added to the sand box while vibration is performed; Stage 2: the vibrating frequency is adjusted, the sand box is vibrated at the medium frequency, and dry quartz sand with the medium granularity is added to the sand box while vibration is performed; Stage 3: the vibrating frequency is adjusted, the sand box is vibrated at the high frequency, and dry quartz sand with the large granularity is added to the sand box while vibration is performed. The technology has the remarkable control effect on the surface defect of the grinding ball.

Description

technical field [0001] The invention relates to the field of metal wear-resistant materials, and more particularly, to a molding process of a large-scale hollow grinding ball. Background technique [0002] The main grinding principle of the medium-speed mill is that the grinding balls roll between the upper and lower grinding rings to pulverize the minerals entering the grinding channel. The grinding balls and grinding rings are the main wearing parts, and are usually placed 5 to 10 grinding balls, with the enlargement of the equipment, the size of the grinding balls is also larger, the outer diameter is from Φ750mm to Φ1150mm, in order to reduce the weight of such large grinding balls, hollow balls are made, the wall thickness is from 135mm to 150mm, the weight is from 135mm to 150mm. From 1.2 tons to 3.6 tons, and set 5 process holes, the diameter of which is Φ90mm to Φ100mm; since the hollow grinding ball bears a large impact load during the operation, CrNiMo cast steel i...

AI Technical Summary

Problems solved by technology

[0004] However, the technical problem in the above-mentioned application is that the large-scale hollow grinding ball manufactured by the above-mentioned preparation method is prone to product defects such as cracks and slag holes on the surface during the casting process due to the large size of the hollow grinding ball, and the size is relatively smaller. The larger the hollow grinding ball, the more obvious the product defects such as cracks and slag holes appear on the surface

[0005] Therefore, how to overcome product defects such as cracks and slag holes that are prone to appear on the surface of the existing large-scale hollow grinding balls during the casting process is a technical problem that needs to be solved urgently in the prior art

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