Surface repair pretreatment method of hot roll supersonic spraying

Abstract

The invention discloses a hot roller supersonic spraying surface repair pretreatment method. The hot roller supersonic spraying surface repair pretreatment method comprises specific procedures of 1) concave cutting treatment, 2) surface cleaning, 3) surface plate shape formation and 4) surface roughening, wherein the surface roughening specifically comprises the following steps: (1) similar vertical strip patterns are formed through primary sand blasting; and the roughness is controlled within Ra 2.5-3.2; (2) a roller is stopped rotating; two sample plates are fixed on the surface of the roller after primary sand blasting; a sand blasting gun blasts sand in a spiral gap between the two sample plates; and the roughness is controlled within Ra 5.5-6.5; (3) the two sample plates are overturned and fix on the surface of the roller after secondary sand blasting; the sand blasting gun blasts sand in the spiral gap between the two sample plates; and the roughness is controlled within Ra 5.5-6.5; and (4) the hot roller is preheated. The method can obtain a supersonic spraying layer with high bonding strength and higher wear resistance, prolongs the service life of the roller, and reduces the production cost.

Description

technical field [0001] The invention belongs to the technical field of material surface strengthening, in particular to a supersonic spraying surface repair pretreatment method for hot rolls. Background technique [0002] The roll of hot-rolled plate is an important part of the rolling mill and plays a key role in the quality of the rolled piece. During the daily use of the roll, the roll surface and the rolling piece are in contact and rubbed for a long time, and the roll surface is prone to wear and tear, which needs to be repaired. Before the roll is sprayed, it needs to be pretreated on the surface. The specific process is: 1) Concave cutting treatment: when there is a fatigue layer on the surface and a groove mark with local severe strain, turning treatment can be carried out under the premise that the strength allows. Spraying provides space for accommodation; 2) Surface cleaning: remove oil, rust, paint, etc. on the surface of the workpiece to make the surface of the...

AI Technical Summary

Problems solved by technology

In this way, the repaired hot roll can go online again, but because the surface bonding strength and wear resistance of the sprayed coating are not sufficient, it can only work for 15-18 hours after going online again, and the roll surface will be rough again, causing The product is unqualified and must be offline for repair

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