Method for improving air tightness of investment casting aluminum processing equipment

A tooling gas and precision casting technology, which is applied to the device for coating liquid on the surface, pretreatment surface, coating, etc., can solve the problems of unqualified air tightness, tooling pores, trachoma, etc., and achieve a simple and reliable process method. The effect of improving the qualification rate of tooling and reducing production costs

Active Publication Date: 2011-05-11
XIAN AIRCRAFT IND GROUP
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Problems solved by technology

However, due to the defects in the casting process itself, the manufactured tooling often has defects such as pores and sand holes, which leads to the failure of the air tightness inspection of the aluminum tooling and the tooling cannot be delivered for use.
The repair method of tooling air leakage usually adopts welding method. This method is better for repairing tooling with obvious cracks, pores, sand holes and other defects. Welding and repairing cannot be performed, and the tooling is often scrapped due to unqualified air tightness

Method used

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  • Method for improving air tightness of investment casting aluminum processing equipment
  • Method for improving air tightness of investment casting aluminum processing equipment
  • Method for improving air tightness of investment casting aluminum processing equipment

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Embodiment approach

[0016] See attached picture, figure 1 It is a large-scale precision-cast aluminum tooling for manufacturing composite material parts for aircraft. The tooling was found to have local defects during inspection, which resulted in unqualified air tightness of the tooling and could not be delivered for production. The specific repair implementation plan is as follows:

[0017] 1. Surface cleaning:

[0018] First, remove the casting residue on the back of the air leaking part of the tooling to expose the true color of the metal and roughen it. The rougher the surface, the better; then use a cleaning agent to clean it repeatedly to ensure that it is oil-free and water-free, at least three times. Dry at room temperature for at least four hours or heat to 150°C for one hour.

[0019] 2. Brush penetrating agent

[0020] Penetrate with penetrant. First, heat the precision cast aluminum tooling to 60 ℃ ~ 80 ℃, keep it warm for at least 3 hours, then apply the penetrant on the back of...

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Abstract

The invention relates to a method for improving the air tightness of investment casting aluminum processing equipment used for manufacturing aerospace composite material parts, wherein the surface of the gas-leaked part of the investment casting aluminum processing equipment is coated with an anaerobic penetrating agent containing organic hydrazide and chelating agent, and a layer of polymer patching material taking ceramics and metal as aggregates is applied on the surface of the gas-leaked part of the investment casting aluminum processing equipment, thereby realizing the solidified sealingof solidified type silicone rubber sealing compound. The air tightness of the investment casting aluminum processing equipment can be effectively improved, the production requirement is met, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of aviation manufacturing, in particular to the manufacture and repair of precision-cast aluminum tooling used in aviation composite material parts, in particular to a method for improving the airtightness of precision-cast aluminum tooling. Background technique [0002] Advanced composite materials are playing an increasingly important role in aerospace manufacturing. The amount of composite materials has become one of the important indicators to measure the advanced design of modern aircraft. Because of its high specific strength, high specific stiffness, good corrosion resistance and fatigue resistance, it has been widely used in aviation and aerospace fields. Gradually change from the secondary load-bearing member to the main load-bearing member. For example, the main load-bearing components of aircraft wings, central wing boxes, horizontal tails, vertical tails, and rear pressure frames are widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/38B05D3/00B05D3/12C09D183/04
Inventor 门军新景新荣
Owner XIAN AIRCRAFT IND GROUP
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