This invention relates to a
casting method for complex valve body castings, comprising the following steps: an analysis step, in which the gating
system is designed according to the valve body structure, and the
heat distribution and heat dissipation during the
casting process are analyzed to determine the heat dissipation
location data and heat dissipation rate data; a chilling step, in which
chills are fabricated based on the heat dissipation
location data and heat dissipation rate data; a sand core preparation step, in which sand cores are fabricated based on the heat dissipation
location data and heat dissipation rate data; a box-closing
casting step, in which the sand core is placed in the sand box, the
chills are inserted into the sand box, and then the box is closed, with the casting volume gradually increasing during the casting process; the casting temperature is 1610-1630℃;
inert gas is introduced at the beginning of the casting process; the amount of
inert gas is gradually reduced; and a box-opening and cleaning step, in which the sand box is slowly cooled to 300℃ before opening; after opening the box, the sand is cleaned and the gating
system is cleaned. This method solves the problem in existing solutions where uneven valve body wall thickness leads to uneven heat dissipation, resulting in casting defects within the valve body.