Hard anodizing method of top surface of piston

A hard anodizing, piston top technology, applied in the direction of anodizing, pistons, cylindrical pistons, etc., can solve the problems of reduced density, larger micropores, and more heat, reducing adverse effects and reducing oxidation voltage. , the effect of good electrical conductivity

Inactive Publication Date: 2011-01-12
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This shows that whether it is chemical dissolution or electric field dissolution, it is related to the heat content or temperature of the oxide film. If the heat content is high, the high temperature will cause a large amount of dissolution of the oxide film, making it difficult to obtain a thick film, and the micropores in it will become larger and arranged. Disorder, reduced density
Since the thermal conductivity of the oxide film is much smaller than that of the aluminum substrate, none of the existing hard oxidation methods for aluminum pistons can effectively remove the anodic oxidation reaction heat to achieve a thicker and denser oxide film

Method used

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Examples

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Effect test

Embodiment 1

[0012] Example 1: Ф105mm ZL109 engine piston top surface hard anodic oxidation method:

[0013] (1) Use hard anodic oxidation surface treatment power supply equipment, put the piston 3 into the composite cooling oxidation device to perform hard anodic oxidation surface treatment on the top surface of the piston, the composite cooling oxidation device is composed of oxidation working tank 1 and cooling tank 7.

[0014] (2) The oxidation working tank in the composite cooling and oxidation device is equipped with cathode plates 2 and cables 6 connected to hard anodizing surface treatment power supply equipment, and rubber sealing rings 4 are installed in the holes at the bottom of the tank, arranged in a matrix, sealed The ring 4 clamps the piston 1 and acts as a seal to separate the oxidized part and the non-oxidized part of the piston; the cooling tank 7 is equipped with a piston elastic support anode conductive device, including a conductive top plate 8, a spring 9, a cable 10,...

Embodiment 2

[0016] Example 2: Ф90mm ZL 108 engine piston top surface hard anodic oxidation method:

[0017] (1) Use hard anodic oxidation surface treatment power supply equipment, put the piston 3 into the composite cooling oxidation device to perform hard anodic oxidation surface treatment on the top surface of the piston, the composite cooling oxidation device is composed of oxidation working tank 1 and cooling tank 7.

[0018] (2) The oxidation working tank in the composite cooling and oxidation device is equipped with cathode plates 2 and cables 6 connected to hard anodizing surface treatment power supply equipment, and rubber sealing rings 4 are installed in the holes at the bottom of the tank, arranged in a matrix, sealed The ring 4 clamps the piston 1 and acts as a seal to separate the oxidized part and the non-oxidized part of the piston; the cooling tank 7 is equipped with a piston elastic support anode conductive device, including a conductive top plate 8, a spring 9, a cable 10,...

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Abstract

The invention provides a hard anodizing method of the top surface of a piston, which comprises the steps of generating a dense oxidation film on the top surface of the piston by adopting a hard anodizing surface processing technology; carrying out the surface processing on the top surface of the piston by utilizing a hard anodizing surface processing power supply device and a composite cooling oxidation device in the course of hard anodic oxidation processing to ensure that heat flow generated in the course of generating the oxidation film on the top of the piston is transmitted to an aluminum piston matrix part without the need of oxidation; and exchanging the heat with circulating cooling liquid. The invention is beneficial to the generation of the oxidation film; the thickness of the processed oxidation film on the top surface of the piston can reach 120 to 150 micrometers, and the hardness can reach 450 to 560HV; and the method has the advantages of dense film tissue, high production efficiency, less electrolyte amount, low energy consumption, stable and reliable performance and almost no waste.

Description

technical field [0001] The hard anodic oxidation method of the piston top surface of the present invention relates to the hard anodic oxidation process and device of the engine piston top surface, and also relates to places where other aluminum alloy parts require local hard anodic oxidation. Background technique [0002] When the engine is working, the piston is subjected to strong geothermal load, and cracks often appear on the top surface of the piston, resulting in premature failure. The preparation of a dense aluminum oxide film on the top surface of the piston can effectively improve the life of the piston and increase the combustion efficiency of the gas. Compared with the micro-arc oxidation method, the hard anodic oxidation treatment is used to prepare the aluminum oxide film, which has low energy consumption and high process efficiency. Simple and low cost. However, the aluminum oxide film prepared by the current hard anodic oxidation treatment method is relativel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04F16J1/00
Inventor 魏晓伟魏稔峻顾琳邓丽虹
Owner XIHUA UNIV
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