High-pressure molding facing sand and preparation method thereof

Abstract

High-pressure molding facing sand is prepared from the following raw materials in parts by weight: 30-40 parts of fly ash, 8-10 parts of polymeric hydroxy aluminum column bentonite, 7-9 parts of aluminum nitride, 16-18 parts of an ultra-fine silicon powder, 4-5 parts of fluorapatite, 70-90 parts of quartz sand, 5-6 parts of alpha-starch, 130-160 parts of clay, a proper amount of water, and 20-30 parts of an auxiliary agent. With adopting the clay for sintering granulation, the molding sand has good air permeability and good dispersion, and can be recycled; through addition of aluminum nitride and the ultra-fine silicon powder, the heat resistance of clay particles is increased; through the use of quartz sand particles, the fluidity and the air permeability of the molding sand are increased, and bonding of the clay particles is prevented; and the molding sand is applicable to the high-pressure molding facing sand, the surface of a casting piece does not easily produce pores, and heat dissipation is fast.

Description

technical field [0001] The invention relates to the field of casting, in particular to a high-pressure molding surface sand and a preparation method thereof. Background technique [0002] Traditional clay molding sand has many advantages, but it has the disadvantages of being difficult to recycle, poor air permeability, poor fluidity, poor dispersibility, poor collapsibility, poor heat dissipation, and serious environmental pollution. [0003] At present, there is a problem that the particle size of the molding sand is difficult to control. If the particle size of the molding sand is too large, although the air permeability is good, the surface of the casting is rough and the finish is not good; Stomata are produced. [0004] For high-pressure molding surface sand, it needs to have good air permeability, and it is difficult to control the yield of castings with general molding sand [0005] Therefore, the above shortcomings of molding sand need to be overcome. Contents o...

AI Technical Summary

Problems solved by technology

[0002] Traditional clay molding sand has many advantages, but there are disadvantages such as not easy to recycle, poor air permeability, poor fluidity, poor dispersibility, poor collapsibility, poor heat dissipation, and serious environmental pollution.

[0003] At present, there is a problem that the particle size of the molding sand is difficult to control. If the particle size of the molding sand is too large, although the air permeability is good, the surface of the casting is rough and the finish is not good; porosity

[0004] For high-pressure molding surface sand, it needs to have good air permeability, and it is difficult to control the yield of castings with general molding sand