Method for increasing internal surface wearability of engine cylinder body and cylinder sleeve

An engine block and inner surface technology, applied in engine components, cylinders, mechanical equipment, etc., can solve the problems of shallow hardened layer, limited surface wear resistance, limited wear resistance, etc., to reduce the friction coefficient. Effect

Inactive Publication Date: 2007-04-04
武汉飞能达激光技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing surface strengthening technologies, such as laser quenching, plasma quenching, electroplating hard chrome, chemical plating composite materials and other technologies mentioned above, can greatly improve the hardness of the inner surface of the engine block or cylinder liner material, but A stable lubricating oil film cannot be produced between the friction pairs, so there is a limit to improving the surface wear resistance of the cylinder block or cylinder liner
On the other hand, although a separate laser etching process can create an oil storage structure between friction pairs, and can adjust the depth, width, distribution density, and line shape of etched grooves according to different friction conditions and environments, but This process can only achieve the purpose of increasing hardness in a narrow range of laser etching area, and the hardened layer is very shallow
In this way, the range of improving wear resistance is also limited.

Method used

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  • Method for increasing internal surface wearability of engine cylinder body and cylinder sleeve
  • Method for increasing internal surface wearability of engine cylinder body and cylinder sleeve
  • Method for increasing internal surface wearability of engine cylinder body and cylinder sleeve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The engine cylinder block or cylinder liner is made of gray cast iron. After the conventional casting process and machining (including boring, honing inner hole and other processes), the inner diameter of the cylinder block or cylinder liner is about 100 microns away from the final product size. . Blacken the inner wall of the cylinder block or cylinder liner to improve the laser absorption rate on the surface of the material. Then, using CO 2The laser processing machine performs laser quenching on the inner wall of the cylinder block or cylinder liner. The process parameters of laser quenching are: laser power 1.5kw, spot diameter 4mm, scanning speed 45mm / s, laser quenching adopts cross network distribution. The laser quenching area is: when the cylinder body or cylinder liner moves, it includes the stroke area from the top dead center to the bottom dead center of the piston. After laser quenching, the quenched cylinder liner is honed, so that the inner diameter of ...

Embodiment 2

[0026] The engine block or cylinder liner is made of alloy cast iron. After the conventional casting process and machining steps, the inner diameter of the cylinder block or cylinder liner is about 100 microns away from the final product size. Blacken the inner wall of the cylinder block or cylinder liner to improve the laser absorption rate on the surface of the material. Then, using CO 2 Laser heat treatment equipment performs laser quenching on the inner wall of the cylinder block or cylinder liner. The process parameters of laser quenching are: laser power 1.5kw, spot diameter 4mm, scanning speed 45mm / s, laser quenching method is spiral pattern. The laser quenching area is: when the cylinder body or cylinder liner moves, it includes the stroke area from the top dead center to the bottom dead center of the piston. After laser quenching, the quenched cylinder liner is honed, so that the inner diameter of the honed cylinder block or cylinder liner is 10-20 microns smaller ...

Embodiment 3

[0029] The material, processing method and process of the alloy cast iron are the same as those in Example 2. Laser quenching process parameters and methods are also the same as in Example 2. After laser quenching, the quenched cylinder liner is honed, so that the inner diameter of the honed cylinder block or cylinder liner is 10-20 microns smaller than that of the finished product. Laser etching is then performed. The arc length a of the laser-etched helical intermittent stripes is 20mm, the distance b between adjacent stripes is 10mm, the pitch h of the helix is ​​2mm, and the etching depth is 0.08mm. After laser etching, the inner wall of the cylinder block or cylinder liner is finely ground to the size of the finished cylinder liner or cylinder liner with a honing machine, and then it can be used as a finished machine.

[0030] Bench test use effect: If the wear resistance (or service life) of the alloy cast iron cylinder liner without any treatment is taken as a unit, t...

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Abstract

The invention discloses a method for enhancing the wearability in the cylinder of engine and the inner surface of the cylinder cover. The steps are: 1) carries on consolidating treagment to the surface of cylinder and the inner surface of the cover within section between the two stop points of valve; 2) uses laser etching method to etch tiny slots on the cylinder and the inner surface of the cover regularly; 3) grinds the cylinder and the surface of the cover subtly in order to eliminate the remnants around the slots. In the invention, the cylinder and the surface of the cover has high rigidity and oil storing slots, the friction factor is decreased greatly.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and in particular relates to a method for improving the wear resistance of the inner surfaces of engine cylinder blocks and cylinder sleeves. Background technique [0002] Wear is the main cause of engine block or cylinder liner failure. How to properly treat the inner surface of the cylinder block or cylinder liner to greatly improve its wear resistance is the key factor to improve the life of the engine. At present, there are two main types of surface treatment methods for cylinder liners: ① Improve the hardness and wear resistance of the inner surface of the cylinder liner. The process methods used include hard chrome plating, electroless composite plating, laser surface quenching, plasma surface quenching, etc. The aluminum cylinder block also includes electroplating composite materials and anodic oxidation technology; ②Reduce the friction coefficient between the friction pair of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J10/04B23K26/36C21D1/09B24B33/02B23K26/364
Inventor 曾晓雁宋全胜胡乾午
Owner 武汉飞能达激光技术有限公司
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