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A composite thermal spray repair method for the surface of a hydraulic support column

A hydraulic support column and surface composite technology, which is applied in the direction of coating, molten spraying, metal material coating technology, etc., can solve the problems of high cost and insufficient corrosion resistance, and achieve the reduction of preparation cost and corrosion resistance and wear resistance. Excellent and efficient effect

Active Publication Date: 2021-04-16
WUHAN RES INST OF MATERIALS PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of wear resistance, insufficient corrosion resistance and high cost in the surface repair method of the hydraulic support column in the prior art. The present invention provides a method for repairing the surface of the hydraulic support column by composite thermal spraying. , arc spraying and supersonic flame spraying and other multi-process combination to prepare composite coating on the surface of the column

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for repairing the surface of a column of a hydraulic support by composite thermal spraying, comprising the following steps:

[0032] Step 1: Check the curvature of the column of the hydraulic support to be repaired, and perform pressure correction on the column that is bent and deformed;

[0033] Step 2: Turning the surface of the hydraulic support column to remove the fatigue layer and electroplating layer on the surface;

[0034] Step 3: roughen the surface of the hydraulic support column by sandblasting;

[0035] Step 4: Prepare the bottom layer by wire flame spraying or arc spraying;

[0036] Step 5: Prepare the surface layer by supersonic flame spraying method;

[0037] Step 6: use organic resin to seal the surface coating of the hydraulic support column after spraying;

[0038] Step 7: Grinding and polishing the hydraulic support column after the hole sealing treatment, the outer surface roughness of the hydraulic support column after polishing is Ra≤0...

Embodiment 2

[0049] A method for repairing the surface of a hydraulic support column with composite thermal spraying, the difference from Example 1 is:

[0050]In step 4, an arc spraying process is used, and the process parameters are: voltage: 20-35V; current: 150-220A; air pressure: 0.5-0.6MPa.

[0051] During the implementation of step 4, arc spraying is more efficient than wire flame spraying, which is conducive to the batch repair of hydraulic support columns.

Embodiment 3

[0053] A method for repairing the surface of a hydraulic support column with composite thermal spraying, the difference from Example 1 is:

[0054] The composition percentage of the wire used in step 4 is: C: ≤0.03; Si≤1.00; Mn≤2.00; S≤0.30; P≤0.045; Cr: 16.00-18.00; Ni: 10.00-14.00; for iron.

[0055] Compared with Example 1, the material composition used in step 4 has lower hardness, but the coating has better corrosion resistance in acidic corrosive media, and is suitable for surface repair of hydraulic support columns in acidic service environments.

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Abstract

The invention discloses a method for repairing the surface of a column of a hydraulic support by composite thermal spraying. Firstly, the bending degree of the column of the hydraulic support to be repaired is inspected and the pressure is corrected; Afterwards, the surface of the hydraulic support column is roughened by sandblasting; then the bottom layer is prepared by wire flame spraying or arc spraying, and the surface layer is prepared by supersonic flame spraying; then, the surface of the hydraulic support column after spraying is coated with organic resin The layer is sealed; finally, the hydraulic support column after the sealing treatment is ground and polished, and the outer surface roughness of the hydraulic support column after polishing is Ra≤0.2μm. The method prepares the coating by compounding multiple thermal spraying processes, and solves the problems of insufficient wear resistance and corrosion resistance of the coating and high processing cost in the existing single-process repair process, and has positive technical and economic significance.

Description

technical field [0001] The invention belongs to the field of surface repair and remanufacturing, and relates to a metal product surface repair technology, in particular to a composite thermal spray repair method for the surface of a hydraulic support column. Background technique [0002] Hydraulic support is an important support equipment in coal mines. It has the advantages of convenient support, fast support and withdrawal, large initial support force, uniform support force and transverse resistance. It can reliably support and control the roof of the working face and isolate the goaf. Areas, improve the efficiency of fully mechanized mining equipment in coal mines, reduce the labor intensity of workers, and maximize the safety of workers' lives. [0003] The working environment of the hydraulic support is humid and there is a large amount of Cl 2 、H 2 S, SO 2 and other corrosive media, as well as the impact of hard objects such as coal gangue. The hydraulic supports c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/02C23C4/129C23C4/131C23C4/18C23C4/08
CPCC23C4/02C23C4/08C23C4/18C23C28/021C23C4/129C23C4/131
Inventor 陈同舟姚洪高名传余斯亮袁振南张岩
Owner WUHAN RES INST OF MATERIALS PROTECTION
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