CN1544183A - Precoated sand and fence-mending sand composite core making method - Google Patents

Abstract

The invention solves a technical problem of making high-quality cast by low cost. Its main technical project: when producing a sand core of a shape a, first use multiple sand to produce a sand core of a shape b, then place the sand core of a shape b in a hot-core box of a shape an and shoot the coated sand, to make a sand core of a shape a, thus no matter how complex a sand core is, we can make a combined sand core where its outer surface is a high-strength thin coated sand layer and its sand core is made of multiple sand, and the cast made by this sand core combines the advantages of the coated sand and multiple sand. Its use: it is used to make various casts.

Description

The precoated sand and the sand complex modeling core method of reestablishing diplomatic relations

The technical field of the invention: Modeling Material

Background technology: precoated sand has following pluses and minuses when doing core or moulding: advantage: (1) cast(ing) surface is bright and clean, the casting dimension accuracy height, and allowance is little; (2) pourable thin foundry goods, this is because the resin on precoated sand surface is exothermic reaction when cast, and molten metal is had insulation effect, helps metal flow; (3) can realize mechanization, automated production, the production efficiency height.Shortcoming is: (1) precoated sand cost is higher; (2) work under hard conditions,, when moulding core and cast, can produce toxic gas, as contaminated environment such as formaldehyde, phenol, ammonia owing to contain phenolic resins and methenamine etc. in the precoated sand.

The sand of reestablishing diplomatic relations has following advantage: (1) deformability and collapsibility are more excellent, are suitable for the not foundry goods of easy to clean of non-ferrous alloy casting and some especially; (2) nontoxic, do not have smell, nuisanceless; (3) price is more cheap; (4) raising rate is slower, and gas-forming property is lower.Shortcoming: the fineness of core cavity is not as making with precoated sand.

Summary of the invention: the technical problem of required solution: produce high-quality foundry goods with cheap cost.

The main technical schemes that solves this technical problem: as shown in Figure 1, when we are shaped as the core of a in production, produce the core of b shape with the sand of reestablishing diplomatic relations earlier, then this core is placed in the hot box that is shaped as a and penetrates sand with precoated sand, produce compound core, like this no matter how complicated core is, we can produce the precoated sand that outer surface is one deck high strength thin layer, and the interior compound core for the sand of reestablishing diplomatic relations of core, combine precoated sand and the advantage that sand had of reestablishing diplomatic relations with the produced foundry goods of this core, and overcome or reduced their shortcoming.

Claims (1)

1, existing by technical characterictic: as to carry out coremaking or moulding with the precoated sand or the sand of reestablishing diplomatic relations respectively.

Its technical characterictic of the invention is: adopt compound way, produce the core smaller with the sand of reestablishing diplomatic relations earlier than actual required size, then the core of reestablishing diplomatic relations is placed in the hot box of actual size and injects precoated sand, just obtaining outer surface is the skim precoated sand, and the inside is the compound core of sand of reestablishing diplomatic relations.

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