Lost foam casting paint

Abstract

The invention discloses a lost foam casting paint. The paint comprises the following components in parts by weight: 20-30 parts of zircon powder, 15-20 parts of kaolin, 10-15 parts of alundum powder, 2-3 parts of polyvinyl acetate emulsion, 1-2 parts of aluminum sulfate, 0.5-1 part of attapulgite, 0.2-0.3 part of disodium hydrogen phosphate, 5-7 parts of sodium bentonite, 0.4-0.6 part of sodium benzoate, 0.3-0.5 part of ferric oxide, 0.05-0.1 part of n-octanol, 0.6-1.2 parts of carboxymethyl cellulose, 0.05-0.08 part of ethyl acetate, 0.04-0.06 part of nonylphenol polyoxyethylene ether and 15-25 parts of water, wherein the particle sizes of zircon powder and kaolin are both 180-320 meshes and the particle size of alundum powder is 250-350 meshes.

Description

technical field [0001] The invention relates to the field of casting, in particular to the technical field of lost foam casting. Background technique [0002] Lost foam casting is to combine the plastic foam model with the same size and shape as the casting and the riser system made of the same material to form a model cluster, brush the lost foam paint and dry it, and bury it in the dry sand of the special sand box Vibrating and compacting the molding, using vacuum equipment to connect a special sand box to evacuate, pouring high-temperature metal liquid under the condition of maintaining a certain negative pressure in the mold to melt and gasify the mold, and the decomposition products escape through the coating / mould interface, and the liquid state A casting method in which metal occupies the position of the model, solidifies and cools to form a casting. Lost foam casting has outstanding advantages such as high dimensional accuracy of castings, less pollution, and low co...

AI Technical Summary

Problems solved by technology

[0005] Although the lost foam casting process has developed rapidly since its inception, the coating technology has been plagued by the fact that it is difficult to greatly improve the casting yield. The main reason is that the quality of the coating cannot meet the requirements of the lost foam casting process.

One is that the strength at room temperature does not meet the requirements, and the shape is deformed and the coating is damaged during molding, so that the casting is scrapped; the other is that the high-temperature strength is low, and the casting cavity collapses, damages, and paint peeling occurs during pouring, so that the casting is scrapped; the third is that the coating is not suitable. High temperature air permeability, too high air permeability will cause the cavity to collapse, and too low air permeability will cause casting defects such as pores, wrinkled skin, and slag inclusions