Core making method for barrel casting

Abstract

The invention relates to the technical field of castings, in particular to a core making method for a barrel casting. The core making method comprises a core box, an accompanying chiller on the innerwall of the barrel casting and a hollow core bone with a hole, wherein an integrated from of the accompanying chiller and a gas outlet is formed in the core box; and height of the accompanying chillerform is greater than the thickness of the accompanying chiller. Core making steps comprise core box assembly, sand filling, core taking and chiller assembly. A cavity needed for returning a sand coreis formed by the form, so that operations are convenient, environmentally friendly and energy-saving; and moreover, the cavity mutually communicates the hollow core bone, so that gas in the mould cavity and the sand core can be timely discharged, and therefore, quality of the casting is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a core-making method for cylindrical castings. Background technique [0002] In sand casting production, due to the uneven wall thickness of the casting, it is usually necessary to use chilled iron to chill the thick-walled part to ensure the overall quality of the casting. In some cylindrical castings, due to their special structure, it is often necessary to Chill iron is installed, and the inner cavity of cylindrical castings is generally formed by sand cores. If the sand core has insufficient yield, when chill iron is used on the inner wall, the chill iron will hinder the shrinkage of the molten metal and cause cracks in the casting. Deterioration of casting quality. In order to solve this problem, the prior art usually puts core-making materials with good collapsibility on the back of the cold iron, such as sawdust, coal powder, etc., and also buries foam boards ...

AI Technical Summary

Problems solved by technology

Although these methods are widely used, they have the following defects: (1) sawdust, coal powder or foam boards are all disposable and cannot be recycled; If the gas produced by volatile and combustible substances such as moisture and organic matter originally contained in the sand core cannot be discharged in time, it will seriously hinder the filling of the molten metal and easily cause defects such as insufficient pouring and cold shut; (3) sawing When wood powder or foam board is burned, it will produce a large odor, which will deteriorate the production environment

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