A method for forming a combined sand core

Abstract

The molding method of a combined sand core of the present invention adopts 3D printing to form a complex structure, the outer contour of the manual sand core is formed, and the interior of the casting is taken as a whole inner cavity sand core to carry out inner cavity core splitting; the outer sand core along the outer contour of the casting Split the highest surface and the lowest surface; split the sand core by 3D printing to form a 3D sand core and place a core box frame on the outside; fill the hollow space between the core box frame and the 3D sand core with resin sand, and after hardening pass through the The hoisting structure transfers the lower core for core assembly; the positional relationship between the inner cavity cores is determined by the matching concave-convex positioning structure, and the inner cavity sand cores are connected to the outer sand cores through the square door structure; the pouring system is set; Pouring after solidification. The invention has the characteristics of rapid manufacturing, does not need traditional wooden molds, and has significant significance for rapid product development and cost reduction. The amount of sand used for a single product is greatly reduced, the ability of 3D forming castings is improved, and the casting core assembly process is simplified. Save cost and improve casting quality.

Description

technical field [0001] The invention relates to a forming method of a combined sand core, in particular to a casting method of a 3D printing sand core. Background technique [0002] In traditional sand casting, sand cores are mostly formed by hand or by core shooting, and then the sand cores are assembled to form a casting cavity, and high-temperature liquid iron is poured in, the cavity is filled, cooled and cleaned to obtain the required castings. At present, 3D printing sand cores are developing rapidly as a new casting sand core forming method. 3D printing production casting sand cores are flexible and have obvious advantages in rapid manufacturing, complex sand core production and high-precision castings. At the same time, there is still a lot of room to continue to explore in terms of improving 3D printing efficiency and reducing printing costs. Generally, in order to transport, clean and assemble 3D printing sand cores, it is necessary to ensure that the overall stre...

AI Technical Summary

Problems solved by technology

Generally, in order to transport, clean and assemble 3D printing sand cores, it is necessary to ensure that the overall strength of the sand core is sufficient. By increasing the amount of sand consumed by the sand core and increasing the strength of the molding sand, the above methods will increase cost investment, reduce production efficiency, and improve printing head equipment. burden

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