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Surface treatment method of coal mine machinery parts

A technology for coal mining machinery and surface treatment, applied in metal material coating process, coating, solid diffusion coating, etc. Effect

Inactive Publication Date: 2011-11-30
CHANGZHI TONGCHENG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the harsh environment and high reliability requirements of coal mine machinery, equipment parts are required to be wear-resistant and corrosion-resistant. Currently, chrome plating or nickel plating, bluing treatment and other methods are mainly used, but the above methods have low surface hardness and corrosion resistance. Poor, high cost and other disadvantages
The common salt bath composite treatment technology in China is mainly for the treatment of the surface of smaller workpieces, such as the surface treatment of machining tools. Due to the salt bath formula, if the nitriding temperature is too low, a sufficiently deep infiltrated layer cannot be formed; and If the nitriding temperature is too high, the loose layer on the surface will be severe. If the temperature exceeds the tempering temperature, the hardness of the matrix will be reduced. At the same time, the cyanide in the traditional nitrided salt is highly toxic and has great harm to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Preheat Coal Mine Gear Parts

[0033] Put the coal mine gear parts into an externally heated crucible electric furnace, and keep the temperature in the crucible at 510°C for 25 minutes.

[0034] Step 2: Nitriding treatment of coal mine gear parts

[0035] Put 50 parts of urea, 20 parts of potassium carbonate, 10 parts of sodium carbonate, 10 parts of potassium chloride, and 10 parts of potassium hydroxide into an externally heated crucible electric furnace, adjust the temperature of the electric furnace to 570°C, and melt it. Take the coal mine gear parts out of the externally heated crucible electric furnace, put them into the externally heated crucible electric furnace filled with liquid nitride salt, immerse in the molten nitride salt liquid, keep the temperature in the crucible at 570°C, and immerse Time 2.5 hours.

[0036] Step 3: Oxidize coal mine gear parts

[0037] Put 20 parts of sodium nitrite, 15 parts of sodium nitrate, 15 parts of potassium nitra...

Embodiment 2

[0042] Step 1: Preheat the coal mine hydraulic props and cylinder liners

[0043] Put the coal mine hydraulic prop and cylinder liner into the externally heated crucible electric furnace, and keep the temperature in the crucible at 510°C for 25 minutes.

[0044] Step 2: Nitriding treatment of coal mine hydraulic props and cylinder liners

[0045] Put 50 parts of urea, 20 parts of potassium carbonate, 10 parts of sodium carbonate, 10 parts of potassium chloride, and 10 parts of potassium hydroxide into an externally heated crucible electric furnace, adjust the temperature of the electric furnace to 570°C, and melt it. Take the coal mine hydraulic prop and cylinder liner out of the externally heated crucible electric furnace, put them into the externally heated crucible electric furnace filled with liquid nitride salt, immerse in the molten nitride salt liquid, and keep the temperature in the crucible at 570 ℃, immersion time 2.5 hours.

[0046] Step 3: Oxidize coal mine hydra...

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PUM

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Abstract

The method for surface treatment of coal mine machinery parts belongs to metal surface treatment technology, and in particular relates to a method for surface treatment of coal mine machinery parts; the technical problem to be solved is to provide a method that can improve hardness, corrosion resistance, low cost, and is environmentally friendly The most harmful method for surface treatment of large coal mine machinery parts; the technical scheme adopted is: the workpiece to be processed is preheated in the first step, nitrided in the second step, oxidized in the third step, and cooled in the fourth step to obtain Salt bath treatment workpiece; the surface corrosion resistance of the workpiece treated by the present invention is more than 5 times higher than that of chrome plating and nickel plating, more than 10 times higher than that of galvanizing, more than 20 times higher than that of bluing treatment, and the surface hardness is above 50HRC, which is much higher than Chrome plating, nickel plating, and bluing treatment have surface hardness. At the same time, the surface treatment method has low cost and is environmentally friendly, and can be widely used in the surface treatment of large-volume coal mine machinery parts.

Description

technical field [0001] The invention relates to a surface treatment method for coal mine machinery parts, which belongs to metal surface treatment technology, and in particular to a surface treatment method for coal mine machinery parts. Background technique [0002] Due to the harsh environment and high reliability requirements of coal mine machinery, equipment parts are required to be wear-resistant and corrosion-resistant. Currently, chrome plating or nickel plating, bluing treatment and other methods are mainly used, but the above methods have low surface hardness and corrosion resistance. Poor, high cost and other shortcomings. The common salt bath composite treatment technology in China is mainly for the treatment of the surface of smaller workpieces, such as the surface treatment of machining tools. Due to the salt bath formula, if the nitriding temperature is too low, a sufficiently deep infiltrated layer cannot be formed; and If the nitriding temperature is too hig...

Claims

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Application Information

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IPC IPC(8): C23C8/58
Inventor 王玉松王玉顺胡杰先
Owner CHANGZHI TONGCHENG MACHINERY