Surface sand for precise casting and preparation thereof

Abstract

The invention discloses surface sand for precise casting and a preparation process thereof. The surface sand is prepared by mixing low-cost quartz sand serving as a base material and one or more water-soluble alkaline compounds serving as additives and drying the mixture and is used for substituting expensive zircon sand and producing various engineering parts or shoe making moulds and the like by precise casting so as to completely achieve the quality effect of the zircon sand and greatly reduce production cost.

Description

technical field [0001] The invention relates to casting technology and technology, in particular to surface sand for precision casting and its preparation method. Background technique [0002] In the precision casting process, the production of the shell is very important. It is necessary to make multiple layers of refractory sand, the innermost layer of which is the surface sand, which not only affects the high temperature thermochemical stability of the shell, but more importantly, it will directly affect the casting. surface quality. At present, the surface sand used in precision casting is mainly composed of zirconium silicate (or zircon sand, zircon sand). Due to the good thermal shock stability of zircon sand, whether it is used for precision casting of carbon steel or stainless steel, the surface quality of the castings is better, so it has always dominated the precision casting surface refractory material (ie surface sand). However, due to its small reserves in th...

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Problems solved by technology

However, due to its small reserves in the earth's crust, it is expensive, and people have been looking for its substitutes or alternative methods to reduce casting production costs