Functional end face chromium plating method for piston ring and special jig

A special fixture and piston ring technology, applied in piston rings, household appliances, applications, etc., can solve the problems of affecting the piston ring processing yield, poor thickness uniformity of the chromium layer, poor bonding strength of the chromium layer, etc., and achieves less difficulty in processing control. , The thickness of the chromium layer is stable and the uniformity of the chromium layer is good.

Active Publication Date: 2009-01-14
NANJING FAYN PISTON RING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the original decorative chrome plating scheme is used, although prolonging the chrome plating time will increase the thickness of the chrome layer, it will result in poor uniformity of the chrome layer thickness (the thickness difference of the chrome layer can reach more than 0.02mm), severe burrs on the inner side of the piston ring, and poor bonding strength of the chrome layer And other problems have seriously affected the processing yield of this type of piston ring

Method used

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  • Functional end face chromium plating method for piston ring and special jig

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: The described piston ring functional end face chrome plating method comprises the following steps:

[0026] 1. Pre-degreasing: Use commercially available XH-35D degreasing agent (Shanghai Xianghe Phosphating Co., Ltd.) 20g / l to clean the piston ring to remove oil and surface impurities.

[0027] 2. Clamping: Put the pre-degreased piston ring to be plated into the chrome-plated fixture, and install the cathodic protection gasket.

[0028] 3. Electrolytic degreasing: immerse the plating fixture in the electrolyte, and each liter of electrolyte contains the following components and weight:

[0029] Na 2 CO 3 : 40g, Na 3 PO 4 : 30g, XH-35D degreaser: 20g.

[0030] Electrolysis conditions are: cathode current density Dk = 2A / dm 2 , Temperature: 70°C, Time: 3min.

[0031] 4. Water washing: use running water to rinse the electrolyzed chrome-plated fixture.

[0032] 5. Preheat in the tank for 10 seconds.

[0033] 6. Anti-engraving: current density D A =5...

Embodiment 2

[0041] 1. Pre-degreasing: Use commercially available XH-35D degreasing agent (Shanghai Xianghe Phosphating Co., Ltd.) 30g / l to clean the piston ring to remove oil and surface impurities.

[0042] 2. Clamping: Put the pre-degreased piston ring to be plated into the chrome-plated fixture, and install the cathodic protection gasket.

[0043] 3. Electrolytic degreasing: immerse the plating fixture in the electrolyte, and each liter of electrolyte contains the following substances.

[0044] Na 2 CO 3 : 80g, Na 3 PO 4 : 60g, XH-35D degreaser: 30g.

[0045] Electrolysis conditions are: cathode current density Dk = 20A / dm 2 Temperature: 80°C Time: 5min.

[0046] 4. Water washing: use running water to rinse the electrolyzed chrome-plated tooling.

[0047] 5. Preheat the tank for 30 seconds.

[0048] 6. Anti-engraving: current density D A =10A / dm 2 , temperature 62°C, time 40s.

[0049] 7. Chromium plating: current density Dk=40A / dm 2 , temperature 62°C, time 40min.

[0050...

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Abstract

The invention provides a piston ring function end chrome plating method. The piston ring function end chrome plating method comprises the procedures of oil elimination, clamp loading, electrolysis degreasing, water washing, tank entering and preheating, reverse engraving, chrome plating, tank discharging and rinsing, and clap unloading. The invention also provides a special clamping tool used for the chrome plating method, the clamping tool comprises a conduction rod, a lifting stem, a central conducting round block and piston ring installing rings, wherein one end of the conducting rod is connected with the central conducting round block, the other ends are connected with the piston ring installing rings, and one end of the lifting stem is also connected with the central conducting round block. The piston ring function end chrome plating method of the invention has the advantages: firstly, the loading and unloading of the piston and the chrome plating clamping tool are convenient and rapid, and the production efficiency is high; secondly, the technology flow is simple and practical, and the processing control difficulty is small; thirdly, the uniformity of the chrome layer of the same ring is good, and the thickness of the chrome plating layer is guaranteed to be between 0.02 to 0.025 mm; simultaneously the thickness of the chrome layer of the whole batch is stable, and the uniformity of the chrome layer of the whole end surface of the same ring can be guaranteed to be less than and equal to 0.005 mm.

Description

technical field [0001] The invention relates to a chrome-plating method for a piston ring and a special fixture thereof, in particular to a chrome-plating method and a special fixture for a functional end face of a piston ring. Background technique [0002] In the manufacturing process of piston rings, the end faces of piston rings are generally only phosphating, and a small amount of rings are also chrome-plated for decorative effects, but the thickness of the chrome-plated layer is only 1-5 μm, which can only play a decorative and anti-rust function. With the development of internal combustion engines towards high load and high power, higher requirements are put forward for the impact resistance and wear resistance of the end faces of piston rings. Therefore, the designers of internal combustion engines propose to perform functional chrome plating on the end faces of piston rings. The so-called functional chrome plating is Refers to the hard chromium coating with a thickne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D7/08C25D17/06C25D3/04F16J9/00
Inventor 张仪王蓬胜倪鲁堂
Owner NANJING FAYN PISTON RING
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