Valve body combined casting process for sluice valve with flange casting bolt hole

Abstract

The invention discloses a valve body combined casting process for a sluice valve with flange casting with bolt hole. The process comprises steps of: first preparing a mold of an upper shell core outside the valve body, a mold of a lower shell outside the valve body, a flange core mold, an inner shell core mold, a casting cylinder mold and a mold of an upper core mould outside the valve body; respectively arranging the above molds on a hot box core shooter, injecting precoated sand and insulating the molds at 190-230 DEG C for 60-120 s, curing the casting sand, taking out, and respectively preparing into an upper shell core outside the valve body, a lower shell core outside the valve body, a flange core, an inner shell core and a casting cylinder; and finally conducting corresponding combination, casting and post treatment on the above cores to form a valve body product. The valve body produced by the above process has advantages of tightly matched and fixed components, good surface smoothness, high shape size precision, and no back-end production processing procedure; meanwhile, in the production process, procedure preparation is conducted by using cores of different shapes, so as to facilitate collaboration production by many people, improve production efficiency and save production cost. Therefore, the invention creates a novel pattern for casting process.

Description

technical field [0001] The invention relates to a casting process for a valve body, in particular to a combined casting process for a valve body of a directly cast bolt hole gate valve with a flange. Background technique [0002] At present, the general casting process of gate valve body has at least one pair of structural molds forming the outer shape of the valve body and one pair of core box molds forming the inner cavity of the valve body. Inner cavity, there are no bolt holes on the finished flange of the valve body casting made in this way, these bolt holes need to be drilled, which not only affects the production capacity, but also the accuracy of the bolt holes cannot be guaranteed; A pair of core box molds to form the inner cavity of the valve, a pair of sand core molds to form the flange bolt hole convex column structure, the shape mold forms the outer contour of the valve body, the core box forms the inner hole of the valve body, and the sand core with the flange ...

AI Technical Summary

Problems solved by technology

[0002] At present, the general casting process of gate valve body has at least one pair of structural molds forming the outer shape of the valve body and one pair of core box molds forming the inner cavity of the valve body. Inner cavity, there are no bolt holes on the finished flange of the valve body casting made in this way, these bolt holes need to be drilled, which not only affects the production capacity, but also the accuracy of the bolt holes cannot be guaranteed; A pair of core box molds to form the inner cavity of the valve, a pair of sand core molds to form the flange bolt hole convex column structure, the shape mold forms the outer contour of the valve body, the core box forms the inner hole of the valve body, and the sand core with the flange convex column structure On the sand core of the valve body, it is combined with the external contour of the valve body to form a valve body structure cavity. The valve body casting produced by this process, although the flange bolt holes are formed at one time, reduces subsequent machining and improves Bolt hole manufacturing precision, but because the sand mold of the valve body structure is very easy to be punched under the action of molten iron, and because the sand core of the flange convex column structure is set on the sand core of the valve body, it is difficult to accurately position when the mold is assembled, so it is difficult to form mass production benefits

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