Thick and large aluminum alloy frame body type casting and casting method thereof

Abstract

The invention relates to the technical field of aluminum alloy casting, in particular to a thick and large aluminum alloy frame body type casting and a casting method thereof. The method comprises the following steps that S1, a casting sand mold is manufactured, and shot blasting cleaning and drying are conducted on a chilling block, wherein sprues are formed in the two sides of the sand mold; S2, the dried chilling block is placed in the sand mold, a sand mold mold is obtained, and drawing is conducted after the sand mold mold is dried and hardened, wherein the thickness of the lower molded surface of the chilling block is greater than that of the upper molded surface of the chilling block ; S3, the sand mold is subjected to box closing pouring, and a casting crude product is obtained; S4, the casting crude product is subjected to heat preservation for 14 h at the temperature of 543+ / -2 DEG C, water quenching is conducted at the room temperature, the temperature is kept at 155+ / -2 DEG C for 5.5 hours, aging treatment is carried out, and cooling is conducted in the air till the room temperature is reached so as to obtain the product. According to the casting method, the ductility of a thick and large part can be greatly improved by modifying a mold of the thick and large part and combining with an optimized heat treatment process, so that the overall performance of the thick and large part completely meets the aviation industrial standard, and the qualification rate of products is greatly improved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy casting, in particular to a thick aluminum alloy frame casting and a casting method thereof. Background technique [0002] Cast aluminum alloy has the advantages of high strength, low density, low hot cracking tendency, good weldability, corrosion resistance and low production cost, making it an irreplaceable important material in the fields of aviation, aerospace, navigation, automobile and other industries. The frame casting made of ZL114A alloy is an important part used in aerospace, but due to the complex structure and uneven wall thickness of the casting, the mechanical properties of some parts are low. Among them, the part connected with other workpieces is in the shape of a plate with a thickness of about 51mm. Because the grain structure of this part is coarser than other parts, the mechanical properties are low, especially the elongation is particularly low, and it is difficult to ...

AI Technical Summary

Problems solved by technology

[0004] 1) The cooling rate of the entire thick and large part is not enough, resulting in coarse grains, and the mechanical properties are difficult to meet the requirements of the navigation mark

[0005] 2) The alloy liquid finally solidifies at the suspension ring located at the water inlet, and there are hot spots, the mechanical properties are the worst, and there are potential safety hazards

[0006] 3) The quality of castings is unstable, sometimes the ultrasonic flaw detection is unqualified, and there are often air hole defects on the upper bottom surface

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