Die of cast aluminum shell for high pressure switch, and method for producing cast aluminum shell

Abstract

The invention provides a die of a cast aluminum shell for a high pressure switch, and a method for producing the cast aluminum shell. The die of the cast aluminum shell for the high pressure switch comprises a metal die and a sand core; and the die is characterized in that: a lead-in port connected with a crucible liquid raising pipe is arranged on a bottom plate; a straight pouring channel at the bottom of the sand core is connected with the lead-in port; an internal pouring channel is arranged on the straight pouring channel; the metal die is wrapped at the external side of the sand core; araiser core is arranged on the top of the metal die; the inner side of the raiser core and the outer side of the upper part of the sand core form a raiser; and an embedding block is longitudinally arranged at the side of the sand core. The method comprises the following steps of: melting aluminum alloy, assembling the die, casting at low pressure, and taking out the casting component. By using the technical scheme of the invention, the method is simple in operation, easy to control, high in product surface quality, high in technique yield, high in air tightness inspecting yield, and low in production cost.

Description

Technical field [0001] The invention relates to a metal mold forming method, in particular to a mold for preparing a cast aluminum shell for a high-voltage switch and a method for preparing the cast aluminum shell. Background technique [0002] The cast aluminum housing of the high-voltage switch is required to be filled with SF6 gas, the annual leakage rate is less than 0.5%, and the strength value of the casting hydraulic rupture test is higher than 3.75MPa. In recent years, resin sand gravity casting has been adopted, and the process yield is only 50%, and the quality indicators such as pinhole degree, roundness and flatness of the castings are all exceeding the standard, local grains are coarse, and the one-time pass rate of air tightness inspection is low; The second is low production efficiency and high production costs. Therefore, the low-pressure casting metal mold process is used to replace sand casting to improve productivity and pass rate. This is the purpose of the ...

AI Technical Summary

Problems solved by technology

In recent years, resin sand mold gravity casting is often used, and the process yield rate is only 50%, and the quality indicators such as pinhole degree, roundness and flatness of castings all exceed the standard, local grains are coarse, and the one-time pass rate of air tightness inspection is low; Secondly, the production efficiency is low and the production cost is high

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