Method for flowingly corroding complicated slender copper tube cores made of aluminum alloy castings

Abstract

The invention discloses a method for flowingly corroding complicated slender copper tube cores made of aluminum alloy castings. Slots are formed on embedded copper tube cores in the prior art, and the copper tube cores are corroded by a method for soaking the copper tube cores in corrosive liquid and has shortcomings that the corrosion efficiency is low; the copper tube cores cannot be thoroughly corroded, and the quality of castings which are processed in follow-up procedures such as thermal treatment for the castings is affected; and matrixes of the aluminum alloy castings are corroded. In order to overcome the shortcomings, the method is used for dynamically corroding the complicated slender copper tube cores made of the aluminum alloy castings by means of enabling corrosive liquid to flow. The method has the advantages that the corrosive liquid flows in copper tubes by the aid of corrosion-resistant magnetic valves, and the corrosion efficiency is improved; the flow rate of the corrosive liquid can be adjusted, so that the corrosion speed is controlled; the multiple copper tubes or a plurality of castings can be corroded simultaneously by the aid of a multi-tube joint; the requirement on corroding parts with different apertures can be met by means of replacing different sleeves; and the corrosive liquid is basically prevented from being in contact with matrixes of the castings, and accordingly the matrixes are protected against being corroded.

Description

technical field [0001] The invention relates to a method for flowing and corroding complex and elongated copper tube cores of aluminum alloy castings. Background technique [0002] In an aero engine, there are many shell parts. This type of parts requires relatively complex elongated holes (oil holes) to be made inside, with a diameter of Φ3-6mm generally, to transport high-pressure (some need to withstand high pressure up to 120 atmospheres) oil, fuel, lubricants and the like liquid substance. Therefore, the parts are required to have sufficient strength and compactness. [0003] The internal oil holes of aluminum alloy castings are generally directly formed by sand cores, but if the oil holes are particularly slender and complex, it is very difficult to form them with sand cores. First of all, it is difficult to make the slender and complex oil path sand core, and it is easy to break when setting the core; secondly, the slender and complex oil hole sand core is difficul...

AI Technical Summary

Problems solved by technology

[0004] (1) Corrosion of copper pipe takes too long and the efficiency is low;

[0005] (2) Copper pipes (especially slender blind holes) are not corroded cleanly, which affects the casting quality of subsequent casting processes (such as heat treatment, anodizing, etc.);

[0006] (3) A certain amount of corrosion is produced on the aluminum alloy casting matrix immersed in the corrosive solution, which affects the performance of the alloy

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