Vacuum gravity casting method of aircraft engine block

Abstract

The invention relates to a vacuum gravity casting method of an aircraft engine block. The method comprises the following steps: graphite paint is dipped on the surface of a mesoporous sand core of a die used for gravity casting, chilling coating is coated at the part of the die used for gravity casting close to an air passage, a sealing cabin provided with the die is vacuumized before casting through a snake-shaped casting opening, and the mesoporous sand core and the sealing cabin are filled with compressed air after casting. Due to the adoption of the closed vacuum casting, the casting is performed through the snake-shaped casting opening, and as the graphite paint and the chilling coating are adopted, the compressed air is blown in the mesopore to carry the heat away, the shrinkage cavities in the casting part are greatly reduced, the qualification rate of the finished products of the casting part is improved to about 90 percent from 20 percent and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to the field of engine casting, in particular to a vacuum gravity casting method for an aircraft engine cylinder. Background technique [0002] An aluminum alloy cylinder block of an aircraft engine. The basic size of the casting is 160mm×140mm×145mm, and the weight of the casting is 1.64Kg. Relatively long and thin, the appearance of the blade is prone to cold trap and insufficient watering. There is a middle hole with a diameter of 60mm inside, which is the space for the piston to move. This product is made into a casting first, and the casting is machined to form a product. The inner diameter of the blank hole is 56mm, and the middle part of the hole is connected with an airway. The inner diameter of the hole in the casting is 56mm, which is 60mm after grinding. After the surface of the aluminum alloy cylinder casting of the aircraft engine manufactured by the existing gravity casting technology is machined, the surface ofte...

AI Technical Summary

Problems solved by technology

After the surface of the aluminum alloy cylinder casting of the aircraft engine manufactured by the existing gravity casting technology is machined, the surface often exposes pores or shrinkage cavities, especially the aluminum alloy of the aircraft engine that has pores or shrinkage cavities near the airway. Alloy cylinder castings are irreparable waste and cannot be used

In this way, the qualification rate of the aluminum alloy cylinder block castings of the aircraft engine is only 20%, the quality cost rises sharply, and the normal production is basically impossible, so it is difficult to ensure the mass production of the aircraft engine cylinder body.

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