A method and device for near-liquidus differential pressure casting of large complex magnesium alloy components

Abstract

The invention provides a large-scale complex magnesium alloy component near liquidus pressure difference casting method, belonging to the field of magnesium alloy casting, based on the principle of controlled diffusion solidification, by mixing two kinds of alloy mother liquids with different components and different temperatures to obtain a near liquid phase Magnesium alloy casting liquid with linear temperature and high fluidity, based on the anti-gravity casting method, uses pressure to drive magnesium alloy casting liquid to fill the sand mold from bottom to top, and cools and solidifies at a pressure higher than the environment to complete the casting. The present invention also provides a casting device applied to the above casting method, including a first lower tank and a second lower tank for holding two kinds of mother liquors, a middle tank for mixing mother liquors, an upper tank for filling mold tank, a deflector is provided between the lower tank and the middle tank, the lower tank and the middle tank are connected through a riser pipe, and the middle tank and the upper tank are connected through a riser pipe. The invention can effectively reduce the casting temperature of the magnesium alloy, and avoid burning caused by high temperature during resin sand mold differential pressure casting.

Description

technical field [0001] The invention belongs to the field of casting, and in particular relates to a casting method and a casting device of a large complex magnesium alloy component near liquidus differential pressure for aerospace. Background technique [0002] Generally, large and complex magnesium alloy high-end components used in aerospace, such as magnesium alloy cabins, casings, etc., require high precision in shape and size, so resin sand molds are used for anti-gravity casting. However, traditional casting requires a higher temperature to ensure the high fluidity of the molten metal. The binder of the resin sand mold is prone to thermal decomposition under the high-temperature baking of the molten metal, and releases oxidative gas to react with the molten magnesium alloy, resulting in magnesium alloy The molten alloy burns or even explodes during the solidification process, which not only makes the entire furnace of molten metal scrapped, but also threatens the safet...

AI Technical Summary

Problems solved by technology

However, traditional casting requires a higher temperature to ensure the high fluidity of the molten metal. The binder of the resin sand mold is prone to thermal decomposition under the high-temperature baking of the molten metal, and releases oxidative gas to react with the molten magnesium alloy, resulting in magnesium alloy The molten alloy burns or even explodes during the solidification process, which not only makes the entire furnace of molten metal scrapped, but also threatens the safety of workers

Images