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Hard anodizing method of deep-hole aluminum parts and deep-hole aluminum parts made therefrom

A hard anodizing, deep-hole aluminum technology, applied in anodizing, coating, surface reaction electrolytic coating, etc., can solve the problems of ablation, easy breakdown of the oxide film layer, etc. Stable and controllable effect of processing

Active Publication Date: 2019-07-26
CHINA HANGFA SOUTH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The invention provides a method for hard anodizing of deep-hole aluminum parts and the deep-hole aluminum parts made thereof, in order to solve the technical problem that the oxide film layer is easily broken down and ablation occurs in the process of hard anodization

Method used

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  • Hard anodizing method of deep-hole aluminum parts and deep-hole aluminum parts made therefrom
  • Hard anodizing method of deep-hole aluminum parts and deep-hole aluminum parts made therefrom
  • Hard anodizing method of deep-hole aluminum parts and deep-hole aluminum parts made therefrom

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Embodiment 1

[0048] A preferred embodiment of the present invention provides a method for hard anodizing an aluminum part with a deep hole, which is used for the aluminum part with a first through hole in the part 4 to be hard anodized in the deep hole 1 . This embodiment takes the valve housing as an example, refer to figure 1 , figure 2 As shown, the valve housing is provided with a deep hole 1 of φ6.92, and the part 4 to be hard anodized is located at the bottom of the deep hole 1 of φ6.92, which is the side wall of the fourth step hole 2, and the hard anodized part 4 is located at the bottom of the deep hole 1 of φ6. The anodized part 4 includes a first through hole, that is, a φ3 small oil hole 5 at the bottom of the deep hole 1, and the φ3 small oil hole 5 communicates with the outside of the valve housing. In this embodiment, the hard anodizing method for the side wall of the fourth step hole 2 of the valve housing includes the following steps:

[0049] (a) Insert the clamp 3 mad...

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Abstract

The invention discloses a deep hole aluminum piece hard anodic oxidation method which is used for an aluminum piece of which a part to be subjected to hard anodic oxidation in a deep hole is provided with a first through hole. The deep hole aluminum piece hard anodic oxidation method is characterized in that before the hard anodic oxidation, a part which do not need to be subjected to the hard anodic oxidation in the deep hole is protected by a fixture, the first through hole and the deep hole are plugged by rubber stoppers, and the rest part of the aluminum piece is subjected to waxing protection; and when protective wax is not completely cooled, the rubber stoppers are pulled out to allow the first through hole to communicate with the part to be subjected to the hard anodic oxidation in the deep hole. According to the method, after the first through hole is waxed, the first through hole still communicates with the exterior of the aluminum piece, so that during the hard anodic oxidation, a solution can circulate very well, heat generated can be timely taken away in a reaction process, normal technological parameters of the reaction can be kept all the time, a machining process is stable and controllable, and the problems that a hard anodic oxide film is prone to be punctured and the aluminum piece is ablated in a hard anodic oxidation process due to temperature rise are solved.

Description

technical field [0001] The invention relates to the field of hard anodic oxidation, in particular to a method for hard anodic oxidation of deep-hole aluminum parts. In addition, the present invention also relates to a deep-hole aluminum part produced by the above-mentioned hard anodic oxidation method for the deep-hole aluminum part. Background technique [0002] Hard anodizing of aluminum alloy is a thick-layer aluminum anodizing process. The oxide film produced has high hardness, has tiny pores, can absorb lubricants, and can significantly improve the wear resistance of the base metal. In order to improve the service life of aero-engines, local hard anodic oxidation process is usually used in the wear-resistant parts of aluminum alloy pistons, casings, bearing housings and other parts. [0003] The aluminum alloy hard anodizing process selects a certain concentration of sulfuric acid solution, uses the part as the anode, and the lead rod as the cathode, maintains a consta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/04
CPCC25D11/022C25D11/04
Inventor 任志华曹荣华董杨张晓峰刘志勇张黎明李淑华李晓鑫朱春莉
Owner CHINA HANGFA SOUTH IND CO LTD
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