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.