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Ion nitriding process of marine crankshaft

A technology of ion nitriding and crankshaft, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of uneven nitriding temperature, hardness, wear resistance, fatigue resistance, and corrosion resistance. It does not meet the nitriding requirements and other problems, and achieves the effect of consistent nitriding effect, elimination of glow dead angle, and improvement of product qualification rate

Inactive Publication Date: 2015-08-12
GUANGXI WUZHOU YUNLONG PORT & SHIP MACHINERY MFG
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Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides an ion nitriding process for a marine crankshaft, which can solve the problem of hardness, wear resistance and corrosion resistance of the crankshaft after nitriding due to uneven nitriding temperature during the nitriding process. , anti-fatigue, anti-corrosion and other mechanical properties can not meet the nitriding requirements

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  • Ion nitriding process of marine crankshaft

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Embodiment Construction

[0016] Below in conjunction with embodiment the present invention is further described:

[0017] The ion nitriding process of marine crankshaft of the present invention comprises the following steps:

[0018] 1) After the crankshaft workpiece is cleaned, put it into the special tool for ion nitriding of marine crankshafts in the nitriding furnace;

[0019] 2) After the furnace is installed, the temperature of the crankshaft workpiece is slowly raised to 530°C for 6 hours. When the crankshaft workpiece is heated in steps, it is heated with a small current. The heating rate is within 100°C per hour. The ammonia gas is passed into the nitriding furnace. The ammonia gas is After being heated and decomposed in the cracking furnace, it is passed into the nitriding furnace. After nitrogen is finished, slowly cool down to ≤150°C and the crankshaft workpiece is released from the furnace.

[0020] The marine crankshaft ion nitriding special tool adopted in the present invention is ...

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Abstract

The invention discloses an ion nitriding process of a marine crankshaft, relating to the field of metal heat treatment. The ion nitriding process comprises the following steps: (1) arranging a cleaned crankshaft workpiece into a special marine crankshaft ion nitriding tool in a nitriding furnace; and (2) slowly heating the crankshaft workpiece in the furnace to 530 DEG C in a step-by-step manner, keeping the temperature for a period of time, introducing ammonia gas into the nitriding furnace, further heating to 550 DEG C, keeping the temperature for a period of time, cooling to 510 DEG C, keeping the temperature for a period of time, slowly reducing the temperature to be less than or equal to 150 DEG C after finishing the nitriding operation, then discharging the crankshaft workpiece. The ion nitriding process can solve the problems that all mechanical properties of the crankshaft after nitriding such as hardness, wearing resistance, fatigue resistance and corrosion resistance cannot meet the nitriding requirements due to non-uniform nitriding temperature in a nitriding process of the crankshaft.

Description

technical field [0001] The invention relates to a metal heat treatment process, more specifically a nitriding process specially used for ion nitriding of crankshafts. Background technique [0002] With the rapid development of automobiles, construction machinery, agricultural machinery and shipbuilding industries, the annual demand for engines in my country has reached more than 60 million units, ranking first in the world. As the core component of the engine, the crankshaft plays an important role in the process of energy conversion and power output. plays a key role. In terms of marine use, the crankshaft is directly connected to the propeller shaft by the diesel engine to transmit propulsion. After the crankshaft is nitrided, its hardness, wear resistance, fatigue resistance, corrosion resistance and other properties can be greatly improved, so it is one of the important links in the heat treatment of the crankshaft. Ion nitriding, also known as glow nitriding, is carrie...

Claims

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Application Information

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IPC IPC(8): C23C8/38
Inventor 李国文
Owner GUANGXI WUZHOU YUNLONG PORT & SHIP MACHINERY MFG
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