Method for machining shell liner of shell in semi-autogenous mill

Abstract

The invention discloses a method for machining a shell liner of a shell in a semi-autogenous mill. A lifting strip is arranged in the center of the shell liner, the upper portion of the lifting strip is arranged to be a right angle, the lower portion of the lifting strip is arranged to be an obtuse angle, reinforcing ribs and lifting holes are symmetrically and evenly distributed in the two sides of the lifting strip, the shell liner is made of ultrahigh manganese steel alloy, according to the formula, the alloy comprises, by weight, 1.0-1.4% of carbon, 17-19% of manganese, less than 0.05% of phosphorus, 0.3-1.0% of silicon, less than 0.05% of sulphur, less than 0.2% of aluminum, less than 0.5% of vanadium, 1.5-2.5% of chrome, less than or equal to 1.5% of nickel, less than or equal to 0.5-1% of copper, 0.3-1.0% of molybdenum, a micro amount of bohemium, and the balance iron. According to the method, the material formula is changed, the structure of the shell liner is designed, the thermal treatment process is optimized, the whole intensity and hardness of the shell liner are improved, and the mechanical performance of the equipment is met. The labor intensity is reduced, the service life of the equipment is prolonged by at least more than six months, and the economic benefits are improved.

Description

technical field [0001] The invention relates to a semi-autogenous mill, in particular to a processing method for a cylinder liner in a semi-autogenous mill. Background technique [0002] The semi-autogenous mill is the main crushing and grinding equipment in the production of thermal power, mining, chemical industry, metallurgy and other industries at home and abroad, and the cylinder liner and grinding ball are the main working parts in the normal operation of the semi-autogenous mill. Its working principle: The ore rotates with the cylinder, the position is raised rapidly, and it quickly changes from the state of compression to the state of tension. When the gravity of the ore overcomes the centrifugal force, the ore will fall away from the cylinder, but the falling paths of ores of various particle sizes are different. Due to the strong gravity, the upper body first slides down when the upper body reaches a lower height, and at the same time produces impact and grindin...

AI Technical Summary

Problems solved by technology

[0004] 1. Chromium-molybdenum alloy is generally used for domestic semi-autogenous mill cylinder liners, which cannot meet the time requirements of the site, and the service life is about 3 months

[0005] 2. The lifting strip in the middle of the cylinder liner is weak and the strength is not enough, which will easily cause the cylinder liner to fail

Due to the long-term harsh working conditions of cylinder liners and grinding balls, the amount of maintenance and replacement is quite large, which not only wastes manpower, material resources, and financial resources, but also directly affects production efficiency and civilized production of modern enterprises.

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