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Steel cylinder jacket surface treatment process

A surface treatment and cylinder liner technology, applied in the field of steel cylinder liner surface treatment technology, can solve the problems of environmental pollution, complex nitriding process, high cost, etc., and achieve the effect of improving wear resistance, high toughness, and good matching

Inactive Publication Date: 2008-03-05
莱阳市永立精工汽车配件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to replace alloy cast iron cylinder liners with steel cylinder liners has become a research direction in the field of cylinder liner production, and there is no report on the nitriding treatment process for steel cylinder liners
At the same time, chromium plating is more complicated than the nitriding process, the cost is higher, and it can cause environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A surface treatment process for a steel cylinder liner, using a gas nitrocarburizing process to treat the surface of the cylinder liner, comprising the following steps:

[0025] 1. Put the semi-finished steel cylinder liner into the nitriding furnace and raise the temperature to 500-550°C in 2-3 hours;

[0026] 2. Keep warm for 18-22 hours;

[0027] 3. Cool down to 300°C and leave the furnace. Fill the furnace with ammonia gas during heating, heat preservation and cooling. The ammonia gas is used for nitriding, and the filling of ammonia gas is continuous charging; the thickness and hardness of the nitrided layer are adjusted by nitrogen Control the temperature and time of nitriding, the exhaust gas after nitriding is discharged into water, and absorbed by water to form ammonia water;

[0028] 4. Natural cooling.

Embodiment 2

[0030] A steel cylinder liner surface treatment process, the surface layer of the cylinder liner is treated by a carbonitriding process, comprising the following steps:

[0031] 1. Put the semi-finished steel cylinder liner into the nitriding furnace and raise the temperature to 500-550°C in 2-3 hours;

[0032] 2. Keep warm for 18-22 hours;

[0033] 3. Cool down to 300°C and leave the furnace. While heating up, keeping warm and cooling down, continuously fill the furnace with ammonia gas, and add ethanol dropwise at the same time to realize the carbonitriding process on the surface of the cylinder liner;

[0034] Ethanol is used for carburizing to shorten nitriding time and improve nitriding efficiency. Add ethanol dropwise to form a white and bright transition layer and improve corrosion resistance. Add ethanol dropwise at a rate of 20-30 drops / minute;

[0035] 4. Natural cooling.

[0036] The surface treatment process of a steel cylinder liner in the above embodiment has t...

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Abstract

The present invention is surface treatment process for cylinder jacket of steel, and belongs to the field of diesel engine accessory making technology. The surface treatment process for cylinder jacket of steel features the soft gas nitridizing process or carbonitriding process. The present invention has reasonable design, and is smart, simple and feasible. The present invention can form one nitride layer with thickness of 0.1-0.4 mm, hardness up to HV600-700, and capacity of raising the mechanical performance and wear resistance of the cylinder jacket, increasing its service life and raising the piston ring matching performance.

Description

1. Technical field [0001] The invention relates to a surface treatment process for a steel cylinder liner, which belongs to the technical field of diesel engine parts manufacturing. 2. Background technology [0002] Traditional diesel engine cylinder liners use centrifugal casting alloy cast iron or cold-drawn seamless steel pipe as the rough material for cylinder liner manufacturing. The process is complex, the material utilization rate is low, and the manufacturing cost is high. The alloy cast iron material is brittle and easy to break, and its wear resistance is low. , reducing the service life of the cylinder liner. [0003] In recent years, in order to improve the wear resistance and the comprehensive mechanical properties of the cast iron cylinder liner designed and developed in recent years, rare metals such as Cu, Ni, and Mo have been added to the material composition, and a series of complicated heat treatment processes have been adopted, although to a certain exten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26C23C8/32
Inventor 王安江贾进太冯本海尉世政高庆志邢梅弟王磊高爱军徐清
Owner 莱阳市永立精工汽车配件有限公司
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