Manufacturing method of detachable ceramic alloy composite grinding roller

Abstract

The invention discloses a manufacturing method of a detachable ceramic alloy composite grinding roller. The manufacturing method comprises the following steps: firstly, uniformly mixing ceramic particles and low-melting-point alloy powder by binders so as to obtain a mixture; stuffing the mixture in a mold cavity, and forming the mixture into a biscuit; putting the biscuit together with a mold into a drying cabinet, and drying and sintering the biscuit to obtain a ceramic precast part; and taking out the sintered ceramic precast part, fixing the taken ceramic precast part on the surface of a roller skin liner casting mold cavity, casting abrasion-proof alloying metal liquid to obtain a roller skin liner of which the surface presents metallurgical bond by the ceramic precast part and an abrasion-proof alloy material, and finally fixing the roller skin liner on the surface of a roller core. According to the manufacturing method of the detachable ceramic alloy composite grinding roller disclosed by the invention, the roller skin liner is small in size and light in weight, the casting quality and the heat treatment technology are easy to control, and the qualified rate of finished products is high; the surface of the roller skin liner is composited by the high abrasion-proof ceramic precast part and an abrasion-proof alloy, so that the surface of the roller skin liner has double abrasion-proof properties and the toughness of the metal materials; the end surface of the roller skin liner is fixed by bolts, so that the roller skin liner can be detached on the site, and a new roller skin liner is replaced.

Description

technical field [0001] The invention relates to a manufacturing method of a detachable ceramic alloy composite grinding roller, which is applicable to grinding rollers of various vertical mills in thermal power generation, cement, metallurgy, mining and other industries. Background technique [0002] In industries such as electric power, cement, metallurgy, and mining, a large number of grinding rollers are used in the pulverizing system. As the main wear-resistant part, its quality, especially the wear resistance, directly affects the operation rate of pulverizing, pulverized coal Quality, roll consumption and production costs. Due to any grinding roller material, there is serious wear and tear under the working conditions of pulverization. When serious pits and grooves appear in the wear, the pulverized coal efficiency of the coal mill decreases, and the output of the coal mill is insufficient. [0003] At present, most of the grinding rollers used in thermal power plants...

AI Technical Summary

Problems solved by technology

Due to any grinding roller material, under the working conditions of pulverization, there is relatively serious wear and tear. When serious pits and grooves appear in the wear, the pulverized coal efficiency of the coal mill decreases, and the output of the coal mill is insufficient.

[0003] At present, most of the grinding rollers used in thermal power plants are integrally cast high-chromium cast iron. Repeated welding of wear-resistant alloy layers on them after running wear can improve the service life of the grinding rollers, but the integrally cast high-chromium alloy grinding rollers encounter When the coal quality is poor, it is easy to break during the wear process

In addition, although surfacing welding can improve the service life, it is prone to shedding of the surfacing layer. In addition, the cost of surfacing welding is relatively high, and the service life can be extended by at most one year after surfacing welding once. Frequent maintenance shutdowns of power plants have caused great economic losses. loss

[0004] The composite grinding roller produced by Vega Company in India adopts the secondary casting process. Firstly, the ceramic alloy composite liner is prepared by casting the wear-resistant ceramic grid body with high chromium alloy material, and then the ceramic alloy composite liner is prepared by secondary casting. Composite grinding roller, this process solves the problem of short service life and high price of the overall high-chromium alloy grinding roller, but there are no wear-resistant defects of ball milled cast iron between each liner on the entire roll surface, and once the wear is serious, it will accelerate the ceramic alloy. The liner is worn out. In addition, the entire grinding roller cannot be repaired after it is scrapped, and it will be scrapped directly, which adds a lot of maintenance costs to the power plant.

The ceramic alloy composite grinding roller produced by Belgian Magotteaux Company is made of a ceramic core plate (compounded by ceramic particles) with a high-chromium alloy material, which meets the service life of the coal mill, but after the grinding roller is scrapped, The roller core cannot be repaired by surfacing welding, and the repurchase of the grinding roller increases the expenditure of the power plant

In addition, the technology is mastered abroad, and the after-sales service cycle is long, so it is impossible to solve the quality problems for the power plant in time

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