Method for preparing overall shell mold by utilizing vaporizing combustion of mold shell roasting pattern

Abstract

The invention provides a method for preparing an overall shell mold by utilizing vaporizing combustion of mold shell roasting pattern. The method comprises the following steps: preparing a plastic mold by adopting an injection molding method, splicing and assembling the plastic mold to form an overall pattern, and coating, sanding, drying and hardening the overall pattern, thus obtaining a solid mold shell; roasting the obtained mold shell, wherein the pattern disappears due to vaporizing combustion, thus obtaining an overall shell mold; and finally, cleaning and pouring the obtained shell mold, thus obtaining the casting. The method is high in applicability, the complexity of the cast alloy types and casting structures is not limited, the processes of investment casting and dewaxing are reduced, the production cycle is shortened, and the production efficiency is improved. In the process of manufacturing the shell mold, a phenolic resin is not used as an adhesive, and the problems of pungent smell and subskin blowholes of castings in the process of casting and pouring the shell mold are solved. The pattern disappears before pouring due to roasting and vaporizing combustion of the mold shell, the defects of evaporative pattern casting steel casting recarburization and iron casting wrinkled skin are overcome, and the casting quality is improved.

Description

technical field

[0001] The invention belongs to the technical field of shell mold casting, and in particular relates to a method for preparing an integral shell mold by gasifying and burning mold shell roasting patterns. Background technique

[0002] Shell mold casting (shell mold casting) is a casting technology invented by the German J. Cronin in 1943. The surface of the casting is smooth and clean, and the size is accurate. It can be processed without machining or only a small amount of processing. It is especially suitable for large production batches and high dimensional accuracy. Castings with high requirements, thin walls and complex shapes. Shell casting uses the tipping bucket method to manufacture the shell, and the upper and lower (or left and right) two shells are clamped with clamps or glued with resin, and the mold can be formed without a sand box, which can significantly reduce the amount of molding sand. The shell is usually made of coated sand with phen...

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