Hot roller supersonic spraying surface repair pretreatment method

A technology of supersonic spraying and surface repair, applied in coating, fusion spraying, metal material coating technology and other directions, can solve the problems of insufficient bonding strength and wear resistance of the sprayed layer surface, bruising, unqualified products, etc. To achieve the effect of enhanced bonding strength, uniform hardness and extended service life

Active Publication Date: 2018-11-20
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

Method used

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  • Hot roller supersonic spraying surface repair pretreatment method
  • Hot roller supersonic spraying surface repair pretreatment method
  • Hot roller supersonic spraying surface repair pretreatment method

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0031] Example 1

[0032] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, the supersonic spray surface repair pretreatment method of the hot roll of the present invention, the specific steps are: 1) Undercut treatment: when there is a fatigue layer on the surface and severely strained groove marks on the surface, turning treatment can be carried out if the strength permits , Provide a space for thermal spraying; 2) Surface cleaning: remove oil stains, rust, paint, etc. on the surface of the workpiece to make the surface of the workpiece clean. The oil stain can be removed with a solvent cleaner. If the oil stain has penetrated into the matrix material, it can be heated with flame For removal, the rust layer can be removed by acid leaching, mechanical polishing or sandblasting; 3) the surface is open-plate shape; 4) the surface is roughened, and the surface roughening specifically includes the following steps:

[0033] (1) One-time sandblasting to make an approximate v...

Example Embodiment

[0042] Example 2

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

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

Example Embodiment

[0045] Example 3

[0046] The sample plate is made of soft materials, its shape is made according to related methods, and the sample plate 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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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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