Casting method of aluminum alloy extra-high voltage switch shell for gas insulated substation

Abstract

The invention belongs to a casting process in the machinery manufacturing industry, and particularly relates to a casting method of an aluminum alloy extra-high voltage switch shell for a gas insulated substation. An upper mold annular pouring gate is arranged on an upper mold annular pouring gate independent resin sand module, and an upper mold gap pouring gate is arranged at the outer edge of the upper mold annular pouring gate; mold manufacturing is conducted, an upper mold annular pouring gate combined module is composed of the upper mold annular pouring gate independent resin sand moduleand symmetrical parts of the upper mold annular pouring gate independent resin sand module, a lower mold annular pouring gate combined module is composed of a lower mold annular pouring gate independent resin sand module and symmetrical parts of the lower mold annular pouring gate independent resin sand module, nearly half of molten metal for pouring can be saved, the yield is increased by about 10%, energy consumption is reduced, production efficiency is improved, and sand mold integrity is good. The process is convenient to operate, the quality and the service life of products are guaranteed, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the casting process in the machinery manufacturing industry, and in particular relates to a casting method of an aluminum alloy UHV switch case used in a gas-insulated substation. Background technique [0002] At present, gas-insulated substations are widely used in power systems. In gas-insulated substations, SF6 gas is used as the insulating medium inside the pipeline tree, and the exposed UHV switch housings are used for outdoor work. In order to ensure safe and reliable circuit operation In order to ensure the reliability, the UHV switch housing needs to be subjected to a destructive pressure test, and the mechanical properties, surface quality, internal quality, air tightness, tolerance size, etc. of the exposed UHV switch housing are extremely demanding. The inside of the UHV switch housing is a cavity, and the inner cavity is filled with SF6 gas of corresponding pressure. According to practical applications, there are ma...

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Problems solved by technology

Theoretically, when the liquid solidifies into a solid and shrinks in volume, the casting of the switch housing should be continuously replenished with liquid to achieve sequential solidification. The existing casting method makes the upper and lower parts of the vertical barrel far away from the switch housing, plus The cross-sectional area of ​​the gap runner is small, and the aluminum alloy liquid solidifies before the casting at this position, and the alloy liquid cannot provide supplements for the switch housing, resulting in shrinkage and shrinkage cavities. Casting quality defects often occur, affecting the quality of the high-voltage switch housing and service life, and the casting yield is low, the surface is not smooth

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