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Surface repair pretreatment method of hot roll supersonic spraying

A technology of supersonic spraying and surface repair, which is applied in the direction of coating, molten spraying, and metal material coating technology, and can solve problems such as unqualified products, roughening, and insufficient bonding strength and wear resistance of the sprayed coating surface. Achieve uniform hardness, prolong service life and enhance bonding strength

Active Publication Date: 2020-02-18
ANHUI HENGYI HARD FACE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Surface repair pretreatment method of hot roll supersonic spraying
  • Surface repair pretreatment method of hot roll supersonic spraying
  • Surface repair pretreatment method of hot roll supersonic spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, the hot roll supersonic spraying surface repair pretreatment method of the present invention, the specific steps are: 1) concave cutting treatment: when there are groove marks of fatigue layer and local severe strain on the surface, turning treatment can be carried out under the premise that the strength allows , to provide space for thermal spraying; 2) Surface cleaning: remove oil, rust, paint, etc. on the surface of the workpiece to make the surface of the workpiece clean. The oily paint can be removed with a solvent cleaner. If the oil has penetrated into the base material, it can be heated with a flame To remove, the rust layer can be removed by acid leaching, mechanical grinding or sand blasting; 3) the surface is opened; 4) surface roughening, wherein the surface roughening specifically includes the following steps:

[0033] (1) A sandblasting to make a similar vertical stripe pattern

[0034] Inst...

Embodiment 2

[0043] In step (1), the preferred speed is: the roll rotates at a speed of 25-30r.p.m, and the sandblasting gun walks from one end of the surface to be sprayed to the other end left and right along the axial direction at a speed of 100mm.p.m.

[0044] The speed in step (1) can be adjusted to obtain an approximate vertical stripe pattern.

Embodiment 3

[0046] The sample is made of soft material, its shape is made according to relevant methods, and the sample is fixed on the surface of the roll.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129C23C4/02
CPCC23C4/02C23C4/129
Inventor 张陈陈克英王传进
Owner ANHUI HENGYI HARD FACE ENG CO LTD
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