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Plasma nitriding method for cylinder sleeve

A plasma nitriding and cylinder liner technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of large nitriding deformation and high nitriding temperature, and achieve small deformation and low nitriding temperature , the effect of less ammonia

Inactive Publication Date: 2013-04-17
严方
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AI Technical Summary

Problems solved by technology

However, due to the high nitriding temperature and large nitriding deformation of the traditional gas nitriding treatment, it is necessary to reserve a margin to eliminate the deformation of the product through honing machine processing, so that the nitriding layer is also partially removed.

Method used

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Experimental program
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Embodiment Construction

[0006] The technical solution adopted by the present invention to solve the technical problem is: the equipment adopts a plasma desalination furnace. After the cylinder liner that meets the size requirements has passed the inspection, the cylinder liner that has been cleaned with cleaning agent or gasoline is dried and put into the furnace. Vacuumize the furnace, then feed ammonia gas, raise the temperature to 400°C at a temperature not higher than 50°C per hour, keep it for 1 hour, then slowly raise the temperature to 480°C, keep it for 5 hours, and then heat it up at a temperature not higher than 50°C per hour Cool down to 150°C and leave the oven. The color of the cylinder liner after such nitriding treatment is silver gray, because the plasma nitriding temperature is lower than the gas nitriding temperature, the deformation of the product is very small, and it can meet the requirements of use without subsequent processing, and the surface quality is good. At the same time...

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Abstract

The invention relates to a plasma nitriding method for a cylinder sleeve. The method comprises the following steps of: by adopting a plasma nitriding furnace, after being inspected, drying the cylinder sleeve cleaned by using a cleaning agent or gasoline, and charging into the furnace; and vacuumizing in the furnace, charging ammonia, heating to 400 DEG C at the speed which is not rapider than 50 DEG C / h, preserving heat for 1h, slowly heating up to 480 DEG C, preserving heat for 5hours, cooling to 150 DEG C at the speed which is not rapider than 50 DEG C / h, and discharging out of the furnace. The color of the nitrided cylinder sleeve is silver gray, and the plasma nitriding temperature is lower than the gas nitriding temperature, so that a product is very less in deformation, the use requirement can be met without the follow-up machining, and the product is good in surface quality.

Description

Technical field [0001] The invention relates to a plasma nitriding process, in particular to a plasma nitriding process for a cast iron cylinder liner. Background technique [0002] The cylinder liner is the core part of the engine and is also a vulnerable part. The failure mode of the cylinder liner is mostly the early wear of the cylinder liner caused by the non-wear resistance of the inner hole. In order to improve the wear resistance of the inner hole, the gas nitriding process is often used to carry out the overall nitriding treatment on the cylinder liner. However, due to the high nitriding temperature and large nitriding deformation of the traditional gas nitriding treatment, it is necessary to reserve a margin to eliminate the deformation of the product through honing machine processing, so that the nitrided layer is also partially removed. Contents of the invention [0003] In order to improve the wear resistance of cylinder liner products and reduce the deformat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/36
Inventor 严方张加中
Owner 严方
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