Molding sand for high-density models and preparation method of molding sand

Abstract

The invention discloses molding sand for high-density models and a preparation method of the molding sand. The molding sand is prepared from raw materials in parts by weight as follows: 27-39 parts of cement slurry, 64-76 parts of yellow loam, 22-34 parts of xonotlite, 15-25 parts of epistilbite, 41-53 parts of quartz sand, 16-24 parts of olivine, 8-16 parts of activated sludge dry powder, 5-10 parts of coke powder, 10-15 parts of yellow phosphorus ore, 14-22 parts of colloidal graphite powder, 5-10 parts of molybdenum disilicide, 7-11 parts of calcium lignosulphonate, 8-12 parts of polyethylene glycol and 450-550 parts of a modifier. The molding sand has the relatively high wet compressing strength and thermal tensile strength and further had the excellent gas permeability, liquidity and thermal resistance, the preparation technology of the molding sand is simple, the manufacturing cost is low, and the molding sand is suitable for large-scale popularization and application to the high-density models.

Description

technical field [0001] The invention relates to high-density molding sand and a preparation method thereof, belonging to the technical field of molding sand. Background technique [0002] Sand casting is the most common casting method, and molding sand is the most important molding material in the current molding process. Molding sand is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Castings produced with sand molds account for more than 80% of the total casting production. The quality of molding sand directly affects the appearance quality of castings and casting defects such as sand holes, pores, and sand inclusions. With the continuous development of casting technology, the requirements for the performance of molding sand are getting higher and higher. At present, there is a shortcoming of poor comprehensive performance for high-density molding in the market, which seriously ...

AI Technical Summary

Problems solved by technology

With the continuous development of casting technology, the performance requirements of molding sand are getting higher and higher. At present, there are shortcomings of poor comprehensive performance in the market for high-density molding, which seriously affects the surface quality of castings.