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A method for repairing the surface of a piston rod

A repair method and surface repair technology, applied in the direction of metal material coating process, fusion spraying, coating, etc., can solve the problems of very large difference in composition of electroplating layers, low bonding strength, large chemical potential difference, etc. Anti-vulcanization performance, improving appearance quality, and the effect of dense organization

Active Publication Date: 2017-01-25
SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the physical combination between the electroplating coating and the piston rod base material, the bonding strength is not high, and there will be an obvious interface between the electroplating layer and the substrate. The composition of the substrate and the electroplating layer on both sides of the interface is very different, and the chemical potential difference It is also very large. During the long-term sliding friction between the piston rod and the guide sleeve, and when defects appear due to wear and scratches on the piston rod by hard particles, the matrix is ​​exposed. Under the electrochemical action, the corrosion process will follow the potential The position with the largest difference is the rapid expansion of the interface, resulting in a large area of ​​coating loss. Therefore, for the damage and deformation of the piston rod, the traditional brush plating repair and remanufacturing method has a serious problem of coating loss, which limits this to a certain extent. The use of repair and remanufacturing technology, there is no repair and remanufacturing method that can well solve the deformation and surface damage of the piston rod in the mine hydraulic support cylinder in the prior art

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  • A method for repairing the surface of a piston rod
  • A method for repairing the surface of a piston rod

Examples

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Effect test

Embodiment 1

[0051] First, use the method of the present invention to repair the worn surface of the piston rod of the 6.3-meter hydraulic support push cylinder, wherein the material of the piston rod is 42CrMo medium carbon quenched and tempered steel, and the chemical composition is: carbon 0.42%, silicon 0.30%, manganese 0.65% , chromium 1.13%, molybdenum 0.15% ~ 0.25%, nickel ≤ 0.30%, copper ≤ 0.30%, phosphorus ≤ 0.035%, sulfur ≤ 0.035%, iron balance, heat treatment hardness HBS193 ~ 215, rod diameter Ø150mm, length 1100mm, outer Round hard chrome plating 0.05mm, surface roughness Ra0.15μm. The surface of the piston rod is severely worn and strained, the maximum wear depth is about 1.8mm, the coating almost falls off, the surface is rusted, and it is almost scrapped. The price of reordering is not only high but also the cycle is long, which delays production. As a preferred embodiment, adopt the method of the present invention to repair and remanufacture the piston rod damage, the step...

Embodiment 2

[0062] Modified and remanufactured the piston rod of the 4-meter hydraulic support cylinder, the piston rod material is 27SiMn medium carbon quenched and tempered steel, chemical composition: carbon 0.27%, silicon 1.20%, manganese 1.35%, chromium ≤ 0.30%, molybdenum ≤ 0.15%, nickel ≤ 0.30%, copper ≤ 0.30%, phosphorus ≤ 0.035%, sulfur ≤ 0.035%, iron balance, heat treatment hardness HBS175 ~ 203, rod diameter Ø80mm, length 800mm, hard chrome plating on the outer circle 0.05mm, rough surface Degree Ra0.15μm. The surface of the piston rod is worn and strained, the maximum wear depth is about 0.9mm, and the coating part falls off and needs to be repaired. As a preferred embodiment, the method of the present invention is used to repair and remanufacture the damage of the piston rod. The steps are as follows:

[0063] (1) Preparation of spraying powder raw materials, powdered metal raw materials are configured according to the following weight ratio: carbon 0.8%, chromium 19%, boron ...

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Abstract

The invention provides a surface repair method of a piston rod, combining hypersonic flame powder spraying with high-frequency induction remelting. According to the method, an innovatively researched spray powder with good corrosion resistance and abrasive resistance is adopted as a hypersonic flame powder spraying alloy material; the spray powder with abrasive resistance and corrosion resistance is evenly sprayed on the working surface of the piston rod by a hypersonic flame powder spraying technique; a coating is subjected to secondary remelting through a high-frequency induction technique, so as to form a uniform diffusing micro-metallurgy integrated cladding layer with fine texture. The piston rod repaired by the method disclosed by the invention has relatively strong corrosion resistance and abrasive resistance, abrasion between the piston rod and the inner surface of a guide sleeve is reduced, the poor working conditions of acid and alkali corrosion and the like can be well adapted, the service life of the piston rod and an overall cylinder is prolonged, meanwhile, the problem that the coating falls off during the periods of brush plating repair and re-fabrication is completely eradicated, and the surface repair method has a wide marketing prospect.

Description

technical field [0001] The invention belongs to the technical field of equipment repair and remanufacturing, and specifically relates to a supersonic flame powder spraying and high-frequency induction remelting surface repair method for a piston rod, especially a supersonic flame powder spraying and high-frequency induction remelting surface repair method for a piston rod in a hydraulic support cylinder. Frequency Induction Remelting Surface Restoration Method. Background technique [0002] Repair and remanufacturing technology is a surface treatment technology that has developed rapidly in recent years. It is widely used in the repair of surface damage of various types of equipment, especially in coal mining where the investment in disposable equipment is large and the cost of equipment replacement and maintenance is relatively expensive. . Hydraulic support is a mechanized support equipment for mining face developed on the basis of friction props and single hydraulic pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/129
Inventor 王春昌张亚飞刘鹏洲杜超飞刘鸣
Owner SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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