Method for preventing sand cut of furan resin sand and blacking scab

Abstract

A manufacturing technology for preventing sand cut of furan resin sand and blacking scab comprises the following steps: a, sand molding: 40-70-mesh natural silica sand is adopted, the addition of resin is 0.8 percent of the mass of silica sand, the addition of a curing agent is 0.32 percent of the mass of silica sand, and sand is manufactured into a 40*40 mm cylindrical test cube; b, demolding and drying: when the strength of a sand mold reaches 0.5 Mpa to be capable of supporting demolding of the sand mold, direct demolding is performed, after demolding, the drying temperature is adjusted to be 105 DEG C, drying is performed for 20 min, and the temperature is increased to dry moisture so as to accelerate hardening; c, brushing and drying of a coating; brushing and drying of the water-based coating are carried out in the way of drying for 10 min at 350 DEG C; d, sand mold hardening: hardening of the sand mold is accelerated, and drying of the sand mold is performed for 20 min at 105 DEG C; e, strength test; and f, casting verification. The method has the beneficial effects that the casting rejection rate is lowered and the later-period casting processing cost is reduced.

Description

technical field [0001] The invention belongs to the field of casting, and relates to a method for avoiding furan resin sand washing and paint peeling. Background technique [0002] At present, furan resin is mostly used as binder in the production of steel and iron castings at home and abroad. In order to ensure the surface of the casting is smooth and prevent mechanical sand sticking, water-based paint is usually applied to the surface of the sand mold. The production process is uniform and directly painted after the sand mold is released. Water-based paint, after the paint is painted, place the sand mold at a temperature below 180°C to dry the paint. According to the introduction on the first page of Vol. 15, No. 3, Journal of Dalian Railway Institute, although the overall strength of the sand mold in this production process can meet the standard requirements, the water-based coating will reduce the surface strength of the sand mold, resulting in sand washing and paint pee...

AI Technical Summary

Problems solved by technology

According to the introduction on the first page of Vol. 15, No. 3, Journal of Dalian Railway Institute, although the overall strength of the sand mold in this production process can meet the standard requirements, the water-based coating will reduce the surface strength of the sand mold, resulting in sand washing and paint peeling during pouring. and other defects, sand washing and coating peeling often lead to the scrapping of the entire casting. The present invention has developed a new production process, which can effectively solve the problems of sand washing and coating peeling when furan resin sand is combined with water-based coatings for casting production. defects, thereby reducing casting rejection rate and processing cost, and this new production process has no similar process or technology found in the patent library

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