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Piston ring and surface spongy tin plating technique thereof

A technology of piston rings and loose holes, which is applied to piston rings, engine components, mechanical equipment, etc., can solve the problems of slow heat conduction and uneven oil distribution, and achieve the effect of improving service life, uniform oil distribution and improving oil adhesion.

Inactive Publication Date: 2010-09-22
XIANGFAN XINLI HENGXING PISTON RINGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improving the performance of the piston ring is the key to the working performance of the engine. Plating hard chrome on the working surface of the piston ring can improve the surface hardness and wear resistance, but the piston ring has the disadvantages of slow heat conduction in the cylinder liner and uneven oil distribution. It is an urgent technical problem to be solved
[0003] At present, the surface treatment of internal combustion engine piston rings at home and abroad will not be treated by other surface treatment methods after hard chrome plating. Hard chrome plating of piston rings can improve their surface hardness and wear resistance, but the situation is not ideal. The outer surface of the piston ring has loose holes. After chrome plating and then tin plating, the tin layer can greatly reduce the friction coefficient between the piston ring and the cylinder liner, and improve the service life of the friction pair

Method used

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  • Piston ring and surface spongy tin plating technique thereof
  • Piston ring and surface spongy tin plating technique thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Take a number of piston rings and wrap the piston rings with round tiles, press them tightly with the mandrel to ensure that the two end faces of the piston rings are tightly fitted, seal and polish the outer circular surface with sealing glue to ensure good surface roughness , before entering the electroplating tank, use a sandblasting machine for sandblasting. Then wash in clean water at 60°C. Finally put it into the chrome plating bath of the following formula for chrome plating:

[0081] Chromium anhydride CrO 3 : 200g / L; sulfuric acid H 2 SO 4 : 2.2g / L; trivalent chromium (Cr 3+ ): 3.0g / L; acid ratio (CrO 3 / SO 4 2- ): 100 / 1.2; current density: 40A / dm 2 ; Bath temperature: 58 ° C; Plating time: 2.4h.

[0082] Take out the piston ring from the chrome-plating bath, wash it in water at 60°C, put it into equipment: dehydrogenate in an oven at 200°C, and the dehydrogenation time is 3 hours. Then return the piston ring to the machine shop for radial thickness a...

Embodiment 2

[0095] Take a number of piston rings and wrap the piston rings with round tiles, press them tightly with the mandrel to ensure that the two end faces of the piston rings are tightly fitted, seal and polish the outer circular surface with sealing glue to ensure good surface roughness , before entering the electroplating tank, use a sandblasting machine for sandblasting. Then wash in clean water at 65°C. After drying, put it into the chrome plating bath of the following formula for chrome plating:

[0096] Chromium anhydride CrO 3 : 210g / L; sulfuric acid H 2 SO 4 : 2.2g / L; trivalent chromium (Cr 3+ ): 3.2g / L; acid ratio (CrO 3 / SO 4 2- ): 100 / 1.2; current density: 42A / dm 2 ; Bath temperature: 58 ° C; Plating time: 2.4h.

[0097] Take out the piston ring from the chrome plating bath, wash it in water at 65°C, and put it into equipment: dehydrogenation in an oven at 200°C for 3.2 hours. Then return the piston ring to the machine shop for radial thickness and barrel surfa...

Embodiment 3

[0110] Take a number of piston rings and wrap the piston rings with round tiles, press them tightly with the mandrel to ensure that the two end faces of the piston rings are tightly fitted, seal and polish the outer circular surface with sealing glue to ensure good surface roughness , before entering the electroplating tank, use a sandblasting machine for sandblasting. Then wash in clean water at 65°C. After drying, put it into the chrome plating bath of the following formula for chrome plating:

[0111] Chromium anhydride CrO 3 : 210g / L; sulfuric acid H 2 SO 4 : 2.4g / L; trivalent chromium (Cr 3+ ): 3.4g / L; acid ratio (CrO 3 / SO 4 2- ): 100 / 1.2; current density: 45A / dm 2 ; Bath temperature: 60°C; Plating time: 2.6h.

[0112]Take out the piston ring from the chrome plating bath, wash it in water at 70°C, and put it into the equipment: remove hydrogen in an oven at 200°C, and the hydrogen removal time is 3.4h. Then return the piston ring to the machining workshop for r...

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Abstract

The invention relates to a piston ring and a surface spongy tin plating technique thereof. The technical scheme thereof is as follows: the surface of a piston ring body is provided with a chromium plating layer, the outer surface of the chromium plating layer is provided with a spongy reticulate pattern, and the outer surface of the spongy reticulate pattern is provided with a tin plating layer. The invention comprises the following procedures: preplating, etching, chromium plating, washing, removal of hydrogen, hole loosing, washing and drying and tin plating treatment. The invention utilizes a reticulate pattern groove on the surface of the piston ring to store lubricating oil, thus greatly reducing the friction coefficient between the piston ring and a cylinder sleeve, improving oil absorbing property, and prolonging the service life of the piston ring and the cylinder sleeve; and compared with the prior art, the invention prolongs the service life of the piston ring and the cylinder sleeve by more than three thousand hours, improves the power of an internal combustion engine by more than 30 percent, saves oil by 25 percent, is capable of reducing the exhaust amount of gas / smoke of the internal combustion engine, reduces the environment requirements of atmosphere pollution, solves the mechanical wear of the piston ring during running-in period and obtains more perfect use performances.

Description

technical field [0001] The invention relates to a piston ring of an internal combustion engine. The invention also relates to the process of tinning the loose holes on two different metal surfaces of the piston ring surface Background technique [0002] The piston ring is one of the key parts of the internal combustion engine. The quality of the piston ring's working characteristics directly affects the performance of the engine. Its main functions are sealing, heat conduction, evenly distributing lubricating oil and supporting the piston. The piston ring reciprocates with the piston in the cylinder. It is one of the parts with the worst working conditions in the engine and has the shortest service life. They are characterized by high operating temperatures and high-speed sliding under high mechanical loads, subject to intense wear. Improving the performance of the piston ring is the key to the working performance of the engine. Plating hard chrome on the working surface o...

Claims

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Application Information

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IPC IPC(8): F16J9/00C25D5/12C25D3/30C25D3/06C25F3/02
Inventor 王志伦叶德明李垂辉纪冬青
Owner XIANGFAN XINLI HENGXING PISTON RINGS
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