Negative-pressure casting sealed tank for aluminum impeller

Abstract

The invention discloses a negative-pressure casting sealed tank for an aluminum impeller. The negative-pressure casting sealed tank comprises a shell, wherein an upper cover is arranged at the upper end of the shell; a circular hole is formed in the center of the upper cover; a sealing groove is annularly formed in the bottom surface of the upper cover corresponding to upper end face of the shell; a sealing ring is arranged in the sealing groove; a groove is formed in the bottom in the shell; a piece of active cold iron is arranged in the groove; a gypsum mold shell is arranged on the active cold iron in the shell; the upper part of the gypsum mold shell passes through the circular hole in the center of the upper cover; a sealing ring is arranged between the edge of the circular hole in the center of the upper cover and the gypsum mold shell; a suction opening is formed in the side wall of the shell; a pipe joint for vacuumizing is arranged on the suction opening. The negative-pressure casting sealed tank has the advantages of simple structure, convenience in operation and the like. A double-layer structure consisting of a tank body and the upper cover is adopted, and the upper cover and the tank body are sealed movably, thereby reducing the impact of mold clamping force on a gypsum mold, lowering the cracking proportion of the gypsum mold, adapting to negative-pressure casting of a booster impeller, and reducing crack damages to the gypsum mold during sealing.

Description

technical field [0001] The invention belongs to the field of aluminum alloy impeller casting, and in particular relates to the design and application of a gypsum-type sealing protection tank used for negative pressure casting of a supercharger impeller. Background technique [0002] In domestic supercharger impeller casting, due to the thin blades of the impeller castings, it is not easy to form, and the complete molding of the blades cannot be guaranteed in the conventional gravity casting production, which reduces the yield of castings. In order to reduce the scrap rate of impeller castings, the method of negative pressure casting is adopted to improve the filling ability of aluminum alloy liquid. In view of this, the sealed negative pressure casting tank we designed makes the filling process of aluminum alloy liquid under negative pressure, improves the filling capacity of castings, and plays a role in guaranteeing the forming of thin blades. Contents of the invention ...

AI Technical Summary

Problems solved by technology

[0002] In domestic supercharger impeller casting, due to the thin blades of the impeller castings, it is not easy to form, and the complete molding of the blades cannot be guaranteed in the conventional gravity casting production, which reduces the yield of castings

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