Method for producing flap valve cover by adopting resin sand

Abstract

The invention discloses a method for producing a flap valve cover by using resin sand. Firstly, a mold and a sand box are made. The mold has an integrated structure, and the sand box is integrally cast with nodular iron; the original sand and the curing agent are evenly mixed, and furan is added in proportion Mix the resin evenly; fill the sand box with resin sand until the sand box is full and scrape it flat, then place it on the vibration table and shake it mechanically; prepare the coating, and apply the coating on the surface of the formed resin sand. Coating method: After the coating is dry, bake the surface of the coated resin sand with a blowtorch; hoist the sand box to the pouring table and then close the box; add the raw materials to the intermediate frequency furnace for melting according to the conventional nodular iron ratio. The spheroidization is carried out according to the conventional method; the molten iron after spheroidization is transported to the pouring table for pouring, and the box clamp is released after pouring for heat preservation; the temperature is lowered to below 200 degrees and then the sand is shaken; the casting is cleaned.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular 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] In order to overcome the above-mentioned technical problems in the prior art, the object of the present invention is to provide a method for producing a flap valve cover using resin sand, which can eff...

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