Method for producing overturning plate valve cover by resin sand

Abstract

The invention provides a method for producing an overturning plate valve cover by resin sand, aiming at effectively reducing the cementite tissue in a casting piece, and improving the yield. The method comprises the following steps of: firstly manufacturing a mould and a sand box, wherein the mould is of an integrated structure, and the sand box is wholly cast by nodular iron; evenly mixing raw sand and curing agent, and adding furan resin in proportion, and evenly mixing; filling the resin sand into the sand box till the sand box is filled and struck off, and putting on a plain jolter to be mechanically rammed; preparing coating material, and coating the coating material on the surface of formed resin sand, wherein the coating method adopts a pouring and coating method; after the coating material is dried, baking the surface of the resin sand coated with the coating material by a blast burner; hoisting the sand box to a pouring platform for mould assembling; adding raw materials into an intermediate frequency furnace to be smelted according to the normal nodular iron proportion, and balling according to a normal method; transporting the balled molten iron to the pouring platform, pouring under the temperature condition of 1450 DEG C, releasing a box clamp after pouring for 1 hour, and keeping the temperature for 2 hours; falling the sand after cooling to be less than 200 DEG C; and cleaning the casting piece.

Description

technical field [0001] The invention relates to a method for producing a flap valve cover by using resin sand. Background technique [0002] The flap valve cover is the flue outlet part of the coke oven smoke exhaust and dust removal equipment. The existing flap valve cover is generally made of ductile iron castings made of QT500-7, and the thickness of the casting is 8mm. In the actual production process, the casting is Large plane and thin wall parts are not only difficult to cast, but also have a large proportion of casting defects such as cold shut and warping deformation during casting. There is cementite structure in the casting, which affects the quality of the casting. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a method for producing a flap valve cover by using resin sand that can effectively reduce the cementite structure in the casting and improve the yield...

AI Technical Summary

Problems solved by technology

[0002]The flap valve cover is the flue outlet part of the coke oven smoke exhaust and dust removal equipment. The existing flap valve cover is generally made of ductile iron castings made of QT500-7. The wall thickness of the casting is 8 mm. In the actual production process, because the casting is a large plane and thin wall, it is not only difficult to cast, but also casting defects such as cold shut and warping deformation account for a large proportion during casting, and there is carburization in the casting. Body structure, affecting the quality of castings