Alcohol group mold wash used for low-pressure casting of aluminum alloy sand mold and coating process thereof

Abstract

The invention relates to alcohol group mold wash used for the low-pressure casting of an aluminum alloy sand mold and a coating process thereof. The wash comprises the aggregates of talcum powder and titanium pigment, the adhesives of argil and water glass and a solvent of industrial alcohol and is formed by manual or mechanical stirring and mixing. The granularities of the talcum powder, the titanium pigment and the argil select different grain size grades. In the coating procedure of the mold wash of the sand mold, a mode combining rendering and spraying is adopted. After the preparation ofa cast of the sand mold is finished, the wash with coarse particles is firstly rendered at the surface of the cast, a coating is polished after solidification, then the wash with fine particles is sprayed, and the mold is combined and cast after baking. The invention has the advantages of low production cost, simple process, high quality of the surface of the cast and easy popularization.

Description

technical field [0001] The invention relates to a mold coating for aluminum alloy sand mold low-pressure casting and its coating process, which belongs to the technical field of metal materials or metallurgy. Background technique [0002] Coating on the surface of the mold is an important process in the production process of aluminum alloy sand mold low-pressure casting. The main functions of the mold coating are as follows: reduce the surface roughness of the casting; prevent and reduce the sand sticking of the casting; improve the surface strength of the mold and prevent and reduce sand inclusions and sand hole defects in castings; control the cooling speed of castings; improve the efficiency of sand shakeout and cleaning of castings, significantly reduce the workload of casting cleaning, and improve the working conditions of sand cleaning workers. The quality of the mold coating directly affects whether the casting is sand-sticking, sand inclusions, surface finish, dimens...

AI Technical Summary

Problems solved by technology

For melting and casting of aluminum and magnesium alloys with low melting point, other powders with lower melting point and lower cost can be used as the main aggregate, which can greatly reduce the cost of coating while meeting the requirements of alloy melting and casting. Currently, there are few such products in the market

[0004] In addition, there are three conventional paint coating methods: brushing, spraying and dipping: brushing has small requirements on the particle size of the paint, but the coating is very uneven, and it is easy to form flow marks at the same time, which affects the surface quality of castings; while spraying and Dip coating requires a higher particle size of the coating, otherwise it is difficult to achieve spraying and dipping, so the cost of conventional coatings that can be sprayed or dipped is relatively high