Multi-way valve body inner cavity mud core, manufacturing method of multi-way valve body inner cavity mud core and runner core manufactured by multi-way valve body inner cavity mud core

Abstract

The invention discloses a multi-way valve body inner cavity mud core, a manufacturing method of the multi-way valve body inner cavity mud core and a manufactured runner core, and belongs to the technical field of casting sand core manufacturing. According to the multi-way valve body inner cavity mud core and the manufacturing method thereof, the molding sand is formed by mixing the ceramsite sand and the precoated sand, the mixed sand is manufactured into the mud core body through a hot coating method core shooter, and compared with a ceramsite core manufacturing scheme, the cost is controlled, and meanwhile the strength of the mud core is remarkably improved; meanwhile, the surface of the mud core body is sequentially coated with the anti-adhesion film layer and the high-strength fireproof coating in a brushing mode, the anti-adhesion film layer can rapidly form a film layer on the surface of the mud core and can prevent paint from immersing into the mud core to reduce the strength of the mud core, and the high-strength fireproof coating can improve the strength and fire resistance of the mud core; and the problem of core breakage caused by roasting the mud core by high temperature of molten iron is effectively prevented. Through organic combination of mixed sand and two coatings, the economic cost is lower than that of a ceramsite core manufacturing scheme, and meanwhile the strength and the fire resistance of the mud core are far higher than those of a mud core made of ceramsite.

Description

technical field [0001] The invention relates to a foundry sand core, and more particularly, to a multi-way valve body cavity core, a manufacturing method and a manufactured flow channel core. Background technique [0002] The multi-way valve is mainly used in construction machinery such as excavators, and is one of the core components of construction machinery. The structure of the multi-way valve body is complex, the inner cavity flow channel is tortuous and small, the valve holes and the flow channel holes are criss-crossed, the casting production is difficult, and the inner cavity flow channel is easy to produce seams and is not easy to clean, which has a great impact on the performance of the valve body. influences. [0003] The existing multi-way valve casting production process is to divide the internal flow channel core into multiple small coated cores, and then assemble these small coated cores to form the flow channel core. The core shooting machine is produced by...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a multi-way valve inner cavity core and its manufacturing method and the made flow channel core to solve the high cost of the existing core made of pearl sand and the low strength of the core made of ordinary coated sand , easily deformed and broken core, etc., adopt the technical scheme of the present invention to improve the molding sand and the coating, and through the organic combination of the mixed sand and the two coatings, the strength and fire resistance of the mold core are significantly improved , the economic cost is lower than the core-making scheme of pearl sand. At the same time, the strength and fire resistance of the core are much higher than that of the core made of pearl sand. In the case of reducing the core-making cost, the strength of the runner core is effectively improved, and the The pass rate of the product

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