Casting sand core paint dipping process

Abstract

The invention discloses a casting sand core paint dipping process. The casting sand core paint dipping process comprises the following steps: a manufactured casting sand core is taken out; floating sand is blown off; an anti-sintering paint layer is coated in the thick and turning places of the casting sand core, is 0.25-0.31 mm thick, is dried by 10-12 h, and is cooled to the room temperature; and the casting sand core with the anti-sintering paint layer on the surface is positioned in casting paint for dipping by a thickness of 0.225-0.25 mm, and is dried. In the casting sand core paint dipping process, the anti-sintering paint layer is coated locally before paint dipping, so that the sand bonding and sintering defects of the casting sand core can be effectively reduced or prevented, the casting surface roughness is reduced, and the casting cleaning cost is reduced, and the surface quality of the casting sand core is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of foundry industry, and in particular relates to a casting sand core dipping coating process. Background technique [0002] In the production of complex castings such as engine block and cylinder head, due to the higher and higher technical specifications of the engine, the higher power and lighter weight, this requires the wall thickness of the cylinder block and cylinder head to be thinner and thinner. The structure is more complicated. This puts forward higher requirements for casting production. The sand core tends to be complex, thinner and smaller, and the pouring temperature is higher, some have reached 1450°C, but at the same time, the requirements for the cleanliness of the inner cavity of the casting are higher, and the residue in the inner cavity is ≤3g. [0003] The formation of sticky sand is divided into two stages. The initial metal liquid penetrates into the pores to produce mechanical sti...

AI Technical Summary

Problems solved by technology

[0005] The invention patent with the publication number CN103521411A discloses a paint brushing method for the sand core of the hydrogenation valve carbon steel casting. Dilute the original slurry paint, the preparation density is 1.61-1.70g / cm 3 Alcohol-based zircon powder paint, the second and third paints on the surface of the sand mold (core), this method is painted three times, the process is complex, the amount of paint used is large, and the cost is high