Molding sand for vacuum sealing and molding metals

Abstract

The invention discloses molding sand for vacuum sealing and molding metals. The molding sand is characterized by comprising the following components in parts by weight: 70 parts of quartz sand, 10 parts of resin sand, 5 parts of silicon carbide, 15 parts of dolomite, 10 parts of amorphous silicon dioxide, 10 parts of modification purple sand, 2 parts of tourmaline particles, 4 parts of sea-foam stone powder, 5 parts of calcined kaolin, 2 parts of red mud, 5 parts of cordierite powder, 5 parts of talcum powder and 4 parts of graphite. A method for preparing the molding sand comprises the following steps: uniformly mixing the components, sieving the components through a 40-50-mesh sieve to obtain a mixture, freezing the mixture for 8-12 hours in a freezing device in the environment with the temperature of -10 DEG C, and taking out the mixture to prepare the molding sand. The molding sand is low in production cost and has a good using effect; the production efficiency and benefits of enterprises are greatly improved; the labor intensity of workers is greatly alleviated.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a molding sand for metal vacuum sealing molding. Background technique [0002] V-method vacuum molding is the third-generation molding method after mechanical molding and chemical molding. The specific process is to prepare a mold with a pumping chamber. There are vent holes on the mold that can be directly connected to the vacuum tube of the pumping chamber. The EVA film is placed under the film dryer and heated to a softened state. Through the air holes on the mold, the vacuum is applied to the softened plastic film to make it closely adhere to the mold. The negative pressure sand box is placed on the mold, and the sand box is covered. The dry sand is filled, and the dry sand obtains the maximum density through the vibrating equipment. The top of the sand mold is covered with a layer of sealing film, and the sand box is evacuated to cause a pressure difference between the insid...

AI Technical Summary

Problems solved by technology

In this way, not only the operating efficiency is low, but the labor intensity of the workers is high, and the quality of the castings is difficult to guarantee.

[0004] The traditional molding sand is relatively single in composition, which cannot meet the needs of V-method vacuum molding