Forming method of combined sand core

Abstract

The invention provides a forming method of a combined sand core. The forming method comprises the following steps of forming a complex structure by 3D printing, forming an outer contour by using a manual sand core, and splitting an inner cavity core of an inner part of a casting as an integral inner cavity sand core; splitting the highest surface and the lowest surface of an outer sand core alongthe outer contour of the casting; splitting the sand core by 3D printing to form a 3D sand core and placing a core box frame on the outer side; burying resin sand in hollow parts of the core box frameand the 3D sand core, and transferring a lower core to assemble the core through a hoisting and conveying structure arranged on the outer contour after hardening; determining a position relationshipbetween the inner cavity cores through a matched concave-convex positioning structure, wherein the inner cavity sand cores are connected to the outer sand cover through a square door structure; arranging a pouring system; and after mold assembling, carrying out pouring after being fastened by a clamping mechanism. The forming method has the characteristic of fast manufacturing. The forming methodis of significant meaning in developing a product quickly and lowering the cost without a conventional wooden die, the sand use amount of a single product is reduced greatly, the ability of a 3D formed casting is improved, the core splitting and assembling process of the casting is simplified, the cost is saved, and the casting quality is improved.

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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