38results about How to "Avoid flow marks" patented technology

The invention provides a casting coating for a coated sand mold and a preparing method of the casting coating. The casting coating comprises main components including, by mass percent, 49%-51% of zircon powder, 2%-3% of sodium bentonite, 1%-2% of polyvinyl alcohol, 5%-10% of silica sol, 0.2%-0.35% of sodium carboxymethyl cellulose (CMC), 0.2%-0.35% of a penetrating agent JFC, 0.3%-0.4% of an anti-foaming agent and the balance water. The prepared casting coating for the coated sand mold is high in drying speed and smooth in coasting, sand cannot be stuck to the casting obtained after coated sand casting, the coating is resistant to molten steel scouring, the surface finish degree is high, and the quality is good.

The invention relates to a structure capable of preventing a sizing material in a pouring gate from being broken in a mold. The structure is differently characterized by comprising a front mold and a rear mold, wherein a sizing material feeding channel is formed in the rear mold; the rear mold comprises a rear mold core, a straight ejector block and a straight ejector rod; a cavity forming part used for forming the peripheral surface of a cavity part is arranged at the upper end of the rear mold; a sizing material feeding channel forming part used for forming the peripheral surface of a sizing material feeding channel part is formed in one side of the straight ejector block; the sizing material feeding channel forming part is matched with the rear mold core to form a sizing material feeding channel; the sizing material feeding channel forming part comprises a first section extended downward from the upper end of the straight ejector block and a second section connected with the first section and transversely extended to the lower part of the cavity forming part; pouring gate forming parts connected with the cavity forming part are formed in the second section of the sizing material feeding channel; a connection channel forming part used for connecting the cavity forming part with the first section of the sizing material feeding channel is also formed in the upper end of the straight ejector block; material preventing bulges are formed near the connection channel forming part on the cavity forming part. The structure is capable of taking the product and the sizing material in the pouring gate together.

The invention relates to an automatic cast molding sand surface spraying system. The automatic cast molding sand surface spraying system comprises a bottom plate, a rolling device, a compaction deviceand a coating device. A hole is formed in the middle portion of the front end of the bottom plate. The rolling device is arranged on the upper end face of the middle portion of the bottom plate. Thecompaction device is arranged on the inner side face of the lower end of the rolling device. The coating device is arranged on the inner side face of the upper end of the rolling device. The automaticcast molding sand surface spraying system can solve the problems that according to an existing spraying machine, flow marks and stacking of coatings cannot be prevented, a sprayer cannot rotate or incline, the coatings cannot comprehensively cover the surface of a sand mould, the spraying angle cannot be adjusted at will, and secondary compaction cannot be conducted on the surface of molding sand; and the function of automatic spraying of the casting coatings to the surface of the molding sand can be achieved.