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Thermal processing technology of gears for hoisting machinery

A technology for hoisting machinery and gears, applied in metal material coating process, coating, solid diffusion coating, etc., can solve problems such as surface corrosion, increase construction cost, reduce construction safety, etc., and achieve the effect of long service life

Inactive Publication Date: 2014-03-19
常熟市东风齿轮厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The gears used in hoisting machinery are all made of metal. During use, there will be surface corrosion and rust. Fatigue cracks and small pits will be formed on the surface of the gears, resulting in uneven tooth surfaces, causing vibration and noise. Even cause loss of transmission ability
At the same time, wear will occur during use. Continuous wear will cause scratches on the top and root of the tooth, making noise during the transmission process, shortening the service life of the hoisting machinery, increasing construction costs, and reducing construction safety.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A heat treatment process for a gear used in hoisting machinery, comprising the following steps:

[0015] 1) Oxygen Nitriding: The purified ammonia gas is heated to 610°C to precipitate nitrogen ions through a spiral pipe, and oxygen is introduced into the mixer, the temperature is kept at 410°C, and the air pressure is kept at 0.6Pa. The oxygen and nitrogen ions are rotated The flow pipe forms a vortex and slowly fills the surroundings of the gear to be processed. After 12 hours, stop the introduction of oxygen and cool down. When the temperature drops to 310°C, stop the introduction of ammonia gas, and continue to cool down until the gear is cooled;

[0016] 2) Carbonitriding: The purified ammonia gas is heated to 610°C to precipitate nitrogen ions through a spiral pipe, and the carburizing agent is passed into the mixer to make the carburizing depth meet the requirements, the temperature is kept at 510°C, and the air pressure is kept at 0.4 Pa, hydrocarbon and nitroge...

Embodiment 2

[0021] A heat treatment process for a gear used in hoisting machinery, comprising the following steps:

[0022] 1) Oxygen Nitriding: The purified ammonia gas is heated to 600°C to precipitate nitrogen ions through a spiral pipeline, and oxygen is introduced into the mixer, the temperature is kept at 400°C, and the air pressure is kept at 0.5Pa. Oxygen and nitrogen ions are rotated The flow pipe forms a vortex and slowly fills the surroundings of the gear to be processed. After 10 hours, stop the introduction of oxygen and cool down. When the temperature drops to 300°C, stop the introduction of ammonia gas, and continue to cool down until the gear is cooled;

[0023] 2) Carbonitriding: The purified ammonia gas is heated to 600°C to precipitate nitrogen ions through a spiral pipe, and the carburizing agent is passed into the mixer to make the carburizing depth meet the requirements. The temperature is kept at 500°C, and the air pressure is kept at 0.3 Pa, hydrocarbons and nitrog...

Embodiment 3

[0028] A heat treatment process for a gear used in hoisting machinery, comprising the following steps:

[0029] 1) Oxygen Nitriding: The purified ammonia is heated to 608°C to precipitate nitrogen ions through a spiral pipeline, and oxygen is introduced into the mixer, the temperature is kept at 404°C, and the air pressure is kept at 0.55Pa. The oxygen and nitrogen ions are rotated The flow pipe forms a vortex and slowly fills the gear to be processed. After 11 hours, the oxygen supply is stopped and the temperature is lowered. When the temperature drops to 307°C, the ammonia gas is stopped and the temperature is continued until the gear is cooled;

[0030] 2) Carbonitriding: Heating the purified ammonia gas to 603°C to precipitate nitrogen ions through a spiral pipe, and feeding a carburizing agent into the mixer to make the carburizing depth meet the requirements, keeping the temperature at 504°C and the air pressure at 0.34 Pa, hydrocarbons and nitrogen ions pass through th...

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PUM

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Abstract

A disclosed thermal processing technology of gears for hoisting machinery comprises the following steps: 1) oxynitriding; 2) carbonitriding; 3) boronising; 4) austenite nitriding; and 5) isothermal quenching. By employing the provided thermal processing technology of the gears for hoisting machinery, the gears are resistant to wear, resistant to corrosion and long in service life.

Description

technical field [0001] The invention relates to a heat treatment process for gears used in hoisting machinery. Background technique [0002] The gears used in hoisting machinery are all made of metal. During use, there will be surface corrosion and rust. Fatigue cracks and small pits will be formed on the surface of the gears, resulting in uneven tooth surfaces, causing vibration and noise. Even cause loss of transmission ability. At the same time, wear will occur during use, and the continuous wear will cause scratches on the top and root of the tooth, making noise during the transmission process, shortening the service life of the hoisting machinery, increasing construction costs, and reducing construction safety. Contents of the invention [0003] The object of the present invention is to provide a heat treatment process for gears used in hoisting machinery, so that the gears are wear-resistant, corrosion-resistant and have a long service life. [0004] In order to ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/00C23C8/34C23C8/42C23C8/80C21D1/20
Inventor 万小华
Owner 常熟市东风齿轮厂