Sand for precision casting and preparation process of sand for precision casting

Abstract

The invention discloses sand for precision casting. The sand for precision casting is prepared from, by weight, 40-50 parts of quartz stone, 38-45 parts of mullite, 15-18 parts of corundum, 6-10 parts of manganese dioxide, 9-14 parts of magnesium oxide, 5-12 parts of aluminum oxide, 6-9 parts of silicon carbide, 10-16 parts of zirconite, 10-15 parts of grog refractory, 5-8 parts of a binding agent and 9-12 parts of a dispersing agent. Compared with the prior art, a preparation method has advantages that the method is simple, convenient and reasonable in process; the prepared sand for precision casting is high in thermal conductivity and refractoriness; by grinding of raw materials into fine particles, casting quality can be improved beneficially, air permeability is improved, the defect of blow holes is reduced, and yield is increased; in addition, the sand for precision casting is high in collapsibility after casting, so that demoulding is facilitated.

Description

technical field [0001] The invention relates to the technical field of casting sand, in particular to a precision casting sand and a preparation process thereof. Background technique [0002] In the casting process, the metropolis first selects suitable mold materials (generally casting sand accounts for more than 70%) for casting and then casting. Therefore, the selection of casting sand is also very important for casting, especially for precision casting. General casting requires casting sand to have high strength, good heat resistance, less fine powder, and good acid resistance. Precision casting also requires casting sand to be easy to form, high in strength after forming, low in water content, low in forming surface roughness, and non-stick during casting. Sand, good collapsibility after casting. Spherical sand has low surface roughness, good collapsibility but low forming strength, while acute-angled sand has high forming strength, high roughness and poor collapsibili...

AI Technical Summary

Problems solved by technology

Spherical sand has low surface roughness and good collapsibility but low forming strength, while acute-angled sand has high forming strength, high roughness and poor collapsibility. How to obtain foundry sand with excellent performance in all aspects is a difficult point