Production process of ultrathin-wall and leakage-free aviation aluminium alloy castings

Abstract

The invention relates to a production process of ultrathin-wall and leakage-free aviation aluminium alloy castings. The production process is characterized by comprising the following steps of: manufacturing a pressure-casting mould, machining a double circular ingate, a pressure-casting inlet and a distribution pouring gate on a right mould of the pressure-casting mould; machining a T-shaped exhaust groove on a left mould of the pressure-casting mould, pouring, lightly pressing, strongly pressing and demoulding; and finally carrying out infiltration process treatment. The special pressure-casting mould of the ultrathin-wall and leakage-free aviation aluminium alloy castings adopts a double circular feeding structure and a T-shaped exhaust groove structure, wherein the double circular feeding structure ensures that aluminium liquid fast enters a cavity in the pressure casting process and the thin wall of a part is partially filled; and the T-shaped exhaust groove structure ensures the exhaust of the cavity during the fast filling of the aluminium liquid and prevents the castings from carrying gas. The infiltration process of the invention improves the air impermeability of the product and enables the part to have an inflaming retarding function in addition, and the infiltration is finished through carrying out the work procedures of cleaning with hot water, drying, infiltrating and baking on the castings.

Description

technical field [0001] The invention relates to the field of die-casting, in particular to a production process of an ultra-thin-wall non-leakage aerospace aluminum alloy casting used for processing an oxygen regulating valve casting of an oxygen mask. Background technique [0002] Aviation aluminum alloy die-casting parts have high dimensional accuracy, small machining allowance, and thin walls. Not only that, due to the particularity of use under aviation conditions, pressure leakage is not allowed, the structure of the parts is required to be dense, casting defects are not allowed, and the acceptance is extremely harsh. [0003] A typical product is the key component of the oxygen mask in the aviation lifesaving system—the oxygen regulating valve casting of the oxygen mask. The casting belongs to precision die-casting aluminum alloy, the total weight is only 55g, and the structure is complex, and the minimum non-processing wall thickness is 0.5mm , In addition, it must b...

AI Technical Summary

Problems solved by technology

[0002] Aviation aluminum alloy die-casting parts have high dimensional accuracy, small machining allowance, and thin walls. Not only that, due to the particularity of use under aviation conditions, pressure leakage is not allowed, the structure of the parts is required to be dense, casting defects are not allowed, and the acceptance is extremely high. harsh

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