A method for producing nozzles from shell coatings

Abstract

The invention discloses a method for producing a nozzle through an empty shell coating. The method comprises the following steps that a die is manufactured, and drying is conducted after combining; small holes are machined in the die; the empty shell coating is brushed and sprayed on the surface, the small holes are filled with the empty shell coating, and drying is conducted again; a specially-made sand box is arranged on a three-dimensional jolt ramming table; dry sand is loaded, and jolt ramming and slicking are conducted; the dried die is placed on bottom sand, sand filling is conducted, and a box opening is slicked after automatic jolt ramming; the sand box opening is covered with a plastic film, a pouring cup is placed, and a negative pressure system is connected; after ramming, molten steel pouring is conducted, the die disappears, and molten metal replaces the position of the die; and after a casting is condensed, vacuum is released, box overturning is conducted, and the casting is taken out and is the formed nozzle. According to the method for producing the nozzle through the empty shell coating, the through holes are machined in the foam plastic gasification die of the nozzle, one hole is formed commonly within 0.2 m<2>, two faces of a plate of the foam plastic gasification die of the nozzle support each other, the strength of the two faces of the plate is improved, and therefore pouring can be conducted, the holes are subjected to full weld after the finished product is obtained, and the mechanical performance and strength are not affected.

Description

technical field [0001] The invention relates to a method for producing nozzles from shell paint. Background technique [0002] Lost foam casting products are generally considered to be less dense than sand casting or precision casting. When producing large nozzles, lost foam casting is used for various reasons. Currently, foam molding is used to add a pouring system, and the shell paint ( Good strength and toughness), after drying and igniting the foam, the shell paint is left, and then poured in a negative pressure box (small pieces can not use negative pressure), the resulting density is the same as sand casting, but when the flat plate area is larger (no Reinforcing ribs, etc.), although the strength of the shell coating is strong, it is limited after all and is easy to break. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and solve the existing technical defects. The present inve...

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Problems solved by technology

[0002] Lost foam casting products are generally considered to be less dense than sand casting or precision casting. When producing large nozzles, lost foam casting is used for various reasons. Currently, foam molding is used to add a pouring system, and the shell paint ( Good strength and toughness), after drying and igniting the foam, the shell paint is left, and then poured in a negative pressure box (small pieces can not use negative pressure), the resulting density is the same as sand casting, but when the flat plate area is larger (no Ribs, etc.), although the strength of the shell coating is strong, it is limited after all, and it is easy to break

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