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Vacuum gravity casting method of aircraft engine block

An engine cylinder block and gravity casting technology, applied in the field of engine casting, can solve the problems of difficulty in ensuring the mass production of aircraft engine cylinder blocks, rising quality costs, and inability to produce normally, and achieves the benefits of sequential solidification, stable filling, and reduction of pores. or the effect of shrinkage

Inactive Publication Date: 2009-10-21
CHONGQING CONSTR ELECTROMECHANICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Vacuum gravity casting method of aircraft engine block
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  • Vacuum gravity casting method of aircraft engine block

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Embodiment Construction

[0024] figure 1 It is a structural schematic diagram of the equipment used in the vacuum gravity casting method of an aircraft engine block of the present invention; figure 2 yes figure 1 The cross-sectional view of A-A in the. refer to figure 1 with figure 2 A preferred embodiment of the vacuum gravity casting method of a kind of aircraft engine block of the present invention is as follows:

[0025] Before pouring, at the surface of the mesoporous sand core 10 of the mold for gravity casting, the graphite coating is soaked, and after the part of the mold near the air passage is coated with chilling coating, such as magnesium sand powder chilling coating or tellurium powder chilling coating, Also available BN-C815 chilling paint (above-mentioned chilling paint is the chilling paint that is widely used in the existing foundry industry), air channel sand core 4 sticks on the middle hole sand core 10, is placed on the lower die 14 together, the After the left and right hal...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/06
Inventor 唐和雍
Owner CHONGQING CONSTR ELECTROMECHANICAL CO LTD
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