A special coated sand for high-alloy castings

Abstract

The invention discloses a special coated sand for castings made of high alloy material, which comprises raw sand, lubricant, binder, curing agent and coupling agent, and the binder accounts for 1.7-1.9% of the total mass of the raw sand %; the curing agent is 9-11% of the quality of the binder; the lubricant is 6-8% of the quality of the binder; the coupling agent is 1% of the quality of the binder -2%; the original sand includes recycled sand, pearl sand and magnetite sand; the recycled sand accounts for 50-65% of the total mass of the original sand; the pearl sand accounts for 25-35% of the total mass of the original sand %; the magnetite sand accounts for 10-15% of the total mass of the raw sand, and has various high-quality characteristics such as high temperature resistance, high strength, low expansion, low gas generation, and easy collapse, which can ensure the smooth process of high alloy castings to improve production efficiency.

Description

technical field [0001] The invention belongs to the technical field of coated sand production, in particular to a special coated sand for high-alloy castings. Background technique [0002] Coated sand is often used in steel castings and iron castings. The surface of the sand grains is covered with a layer of solid resin film molding sand or core sand before molding. There are two coating processes: cold method and hot method: the resin is dissolved in ethanol in the cold method , and add urotropine during the sand mixing process, so that the two are coated on the surface of the sand grains, and the ethanol volatilizes to obtain coated sand; the thermal method preheats the sand to a certain temperature, adds resin to make it melt, and stirs to make the resin coated Cover the surface of sand grains, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtain coated sand. [0003] At present, domestic coated sand factories are able to produce coated sand wi...

AI Technical Summary

Problems solved by technology

[0005] However, the coated sand produced for various casting defects has higher and higher requirements according to the casting material, and more and more new casting material standards have been developed. A series of high-alloy casting materials are becoming more and more common, while the original Some special coated sands produced solely for various casting defects are increasingly unable to meet the requirements of high-alloy castings

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