Moulding sand for casting noumenal cast product

Abstract

The invention discloses moulding sand for casting a noumenal cast product. The moulding sand comprises the following components in part by weight: 92 to 95 parts of return sand, 2 to 5 parts of fresh sand, 1.5 to 3.5 parts of pot clay, 0.5 to 1.5 parts of coal dust and the balance of water. The return sand is a recycled resin sand and the urethane resin content of the resin sand is 20 to 40 percent. The pot clay comprises the following components in part by weight: 70 to 80 parts of kaolin, 5 to 10 parts of quartz powder and 10 to 20 parts of clay. The compactibility of the moulding sand is 38 to 45 percent; the green compressive strength is 0.125 to 0.14 MPa; the air permeability is more than or equal to 100; and the mass percentage of the water is 3.8 to 4.3 percent. The moulding sand has the advantages of relatively strong liquidity, relatively good air permeability, relatively strong bonding degree and relatively high conservation property.

Description

technical field [0001] The invention relates to a molding sand, in particular to a molding sand used for casting body-like castings, and is particularly suitable for high-strength, good-permeability molds used for casting body-like castings. Background technique [0002] Molding sand is a material used for molding in sand casting. Molding sand is generally mixed with molding materials such as foundry sand, sand binder and auxiliary materials in a certain proportion. Natural silica sand containing clay can also be used. The role of molding sand in the casting process is very important. The casting waste caused by the poor quality of molding sand accounts for more than 30% of the total casting waste. The usual requirements for molding sand are: good fluidity, certain plasticity, good air permeability and sand production. [0003] The Chinese patent publication number is CN101574725A, and the invention patent published on November 11, 2009 discloses a molding sand for casting ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems of weak fluidity, poor air permeability and weak adhesion existing in the prior art, and provide a kind of adhesive with strong fluidity, good air permeability and strong adhesion. Molding sand for casting body type castings