Special sand box for high-efficiency V method casting

Abstract

The invention provides a special sand box for high-efficiency V method casting, which comprises a sand box inner wall and a sand box outer wall, wherein a negative pressure chamber is formed between two layers of sand box walls; an exhaust hole and a filter screen which is arranged at the exhaust hole for filtering sand are arranged on the sand box inner wall; a cross beam is arranged at the upper part of the inside of the sand box; and meshes are arranged on the cross beam and can be used for exhausting air. According to the special sand box disclosed by the invention, the cross beam is arranged in the sand box and is used for exhausting the sand box; the problem that negative pressure is not uniform when the sand box is used at present is solved; and in addition, the special sand box has the advantages of simple structure and convenience in manufacture and use.

Description

technical field [0001] The invention relates to casting equipment, in particular to a special sand box for V-method casting. Background technique [0002] V-method casting is a green and environmentally friendly casting method. It is developing rapidly in China and its technology is becoming more and more mature. V method casting is the abbreviation of vacuum sealing molding or negative pressure molding casting process. Its principle is to use plastic film to cover the molding and seal the sand box, rely on the vacuum pump to draw out the air in the mold, and rely on the pressure difference between the inside and outside to make the sand particles compact and form the desired shape. A method of modeling a cavity. The advantage of using the V-method casting is that no binder is used for the molding sand, the shakeout is simple, the sand used for molding is reduced to a minimum, and most of the sand particles can be reused to save costs. [0003] At present, the V method is ...

AI Technical Summary

Problems solved by technology

[0003] At present, the V method is used to cast the castings and the sand box is used. Generally, air is pumped around the sand box, resulting in uneven negative pressure inside the sand box. The closer to the inner wall of the sand box, the greater the negative pressure, resulting in uneven overall density of the casting and affecting the quality of the casting.

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