Precoated sand mold for casting

Abstract

The invention belongs to the technical field of precoated sand molds and particularly relates to a precoated sand mold for casting. The mold comprises a movable mold and a fixed mold, a first mold cavity and a positioning groove are formed in the lower end face of the movable mold, and air outlet holes are symmetrically formed in the movable mold and communicate with the first mold cavity; a positioning groove is formed in the outer side of a cavity opening of the first mold cavity, positioning holes is formed in the positioning groove, and a fixed mold is arranged below the movable mold; a feeding channel is formed in the middle of a bottom end face of the fixed mold, the feeding channel communicates with a second mold cavity, and an upper end face of the fixed mold is provided with the second mold cavity and a strip-shaped block used for positioning. The accurate positioning and mold assembly between the movable mold and the fixed mold are achieved through the cooperation between positioning rods and the positioning holes, and anti-sticking silicone oil in tanhe oil storage cavity flows into the second mold cavity through the cooperation between the positioning rods and the oil storage cavity.

Description

technical field [0001] The invention belongs to the technical field of coated sand molds, in particular to a coated sand mold for casting. Background technique [0002] Coated sand, the surface of the sand particles is covered with a layer of solid resin film before molding or core sand. There are two coating processes: cold method and hot method: the cold method dissolves the resin with ethanol, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand, and the ethanol volatilizes to obtain coated sand; Preheat the sand to a certain temperature, add resin to melt, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtain coated sand. For steel castings and iron castings. [0003] When using molds to produce steel castings and iron castings, in the process of casting products, the upper mold and the lower mold are generally used to close the mold to comp...

AI Technical Summary

Problems solved by technology

[0003] When using molds to produce steel castings and iron castings, in the process of casting products, the upper mold and the lower mold are generally used to close the mold to complete the shaping of the product. During the use of the existing molds, the upper mold and the lower mold Displacement deviation is easy to occur during the mold clamping process, resulting in product deformation or even damage, failing to meet the use requirements, and high product scrap rate

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