Molybdenum phenolic resin precoated sand material for instrument casting

Abstract

A molybdenum phenolic resin precoated sand material for instrument casting comprises, by weight, 1-2 parts of molybdenum phenolic resin, 0.02-0.06 part of a coupling agent, 0.2-0.5 part of urotropin, 0.2-0.5 part of a curing agent, 0.5-1 part of alkali-free glass fiber, 0.2-0.5 part of microcrystalline wax, 1-2 parts of montmorillonoid, 1-3 parts of manganese ore slag, 5-10 parts of emery, 5-10 parts of soldering iron ore sand and 85-95 parts of dead burnt magnesite sand. Compared with conventional precoated sand, the molybdenum phenolic resin precoated sand material for instrument casting, has the performance of reducing the gas generation speed and restraining nitrogen generation besides the performance of the conventional precoated sand, nitrogen holes of castings can be effectively reduced, and accordingly the yield of a casting instrument is increased. The universality of the precoated sand from iron castings to steel castings is improved, the production rate of the castings is increased, the cost of modeling materials of a casting enterprise is saved, and good high-temperature resisting casting performance is achieved.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a molybdenum phenolic resin coated sand material with high temperature resistance for instrument casting. Background technique [0002] Coated sand is molding sand or core sand whose surface is covered with a layer of solid resin film before molding. There are two coating processes for the preparation of coated sand: 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 grains, and the ethanol volatilizes to obtain Coated sand; the thermal method is to preheat the sand to a certain temperature, add resin to melt it, 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 . Coated sand for foundry is mainly used for steel castings and iron castings. [0003] With t...

AI Technical Summary

Problems solved by technology

The coated sand used for instrument casting has high requirements on the performance of coated sand. When the existing coated sand is used for instrument casting, it is difficult to meet the requirements of actual casting performance.