Sodium silicate molding sand and sand casting method based on sand removal through water jet

Abstract

The invention relates to sodium silicate molding sand and a sand casting method based on sand removal through a water jet. The casting method comprises steps of molding sand preparation, molding, core making, mold assembling and pouring. The sodium silicate molding sand used during molding sand preparation is prepared from raw material components in parts by weight as follows: 92-96 parts of quartz sand, 3-6 parts of sodium silicate and 1-2 parts of a molding sand breakdown agent. The molding sand breakdown agent is prepared from raw materials as follows: bentonite, graphite, starch and dextrin. After the pouring step is completed, water is jetted to the molding sand for quick cooling when the temperature of poured melt is reduced to be in the range of 650 DEG C-700 DEG C. The sodium silicate molding sand has the good collapsibility, the purposes of grain refinement and directional exhaust can be achieved through water jetting and quick cooling, and the performance of a casting is improved; loose sand after collapsing can be recycled, the cost is low, and the sand is pollution-free, clean and environment-friendly.

Description

technical field [0001] The invention relates to a sand casting method, in particular to a sand casting method based on water jet sand cleaning and water glass molding sand used, and belongs to the technical field of molding sand casting and molding sand improvement. Background technique [0002] Sodium silicate molding sand has the characteristics of high strength, low cost, easy operation, non-toxic and environmental protection, and has been widely valued by foundry workers in recent years. With the further development of the glass sand casting process, although many modifiers, disintegrating agents, and exhaust agents have been put into production and application one after another, the disintegration and exhaust properties have been improved accordingly, but the strength of the molding sand will decrease, and the sand sticking of the castings will occur. , Inconvenient sand cleaning and difficulty in reusing old sand lead to unstable quality of casting products. [0003] ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to overcome the above-mentioned shortcomings and provide a water glass molding sand and a sand casting method based on water jet sand cleaning, which can solve the problems of poor sand collapsibility, poor exhaust, difficult recovery, and void defects in the casting.