Full-mold casting method of resin sand without vent hole

Abstract

The invention discloses a full-mold casting method of resin sand without a vent hole. The full-mold casting method comprises the steps of manufacturing a pattern and a casting system, molding, smelting casting, forming and cleaning, wherein working allowance is preset on the upper surface of the manufactured pattern in the steps of manufacturing the pattern and the casting system, and no vent hole is formed in the molding step; the casting system comprises a plurality of sprues provided with pouring cups at the top ends and arranged vertically, the volume of the pouring cup is more than that of the sprue, the bottom of the sprue is communicated with a cross gate parallel to the length direction of the pattern, the lower end surface of the cross gate is leveled with the bottom surface of the pattern or is slightly higher than the bottom surface of the pattern, the length of the cross gate is 95% of the length of the pattern, and a plurality of ingates communicated with the pattern are arranged on the cross gate at intervals; and molten metal is poured by the plurality of pouring cups simultaneously during casting. According to the full-mold casting method, no vent hole is formed, pattern burning cannot happen during casting, no harmful gas is generated and the environment protection effect is achieved.

Description

technical field [0001] The invention relates to a casting process method, in particular to a full mold casting method. Background technique [0002] Full mold casting uses polystyrene foamed plastics instead of ordinary molds, and uses furan resin self-setting sand for molding. After the mold is made, it does not take out the mold and directly pours molten metal. Under the action of molten metal, the mold burns and gasifies. Disappears, the molten metal replaces the space occupied by the original pattern, and after cooling and solidification, a casting method with the same shape as the pattern is obtained. [0003] The production process of solid mold casting is generally as follows: 1) Making the pattern and pouring system: polystyrene foam plastic is used to make the pattern and pouring system. The pattern is the same as the casting entity and has a certain machining allowance. The pouring system is designed according to the pattern; 2) Modeling: match and combine the pat...

AI Technical Summary

Problems solved by technology

However, due to the fact that the gas generated by the gasification of the pattern will cause serious environmental pollution during pouring of the full mold casting

With the continuous improvement of environmental protection requirements, it is necessary to invest a lot of money to ensure that production meets environmental protection requirements, which increases production costs and limits the further development of enterprises

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