The invention relates to a
casting method for a thermal
powder ultra-supercritical valve cover. The method is characterized by arranging the positions of the
casting head and pouring water ports reasonably, so that shrinkage area at the center of a
casting head is guaranteed to diverge from a circular truncated cone, and partial of the circular truncated cone is exposed to be used as a
cutting datum; arranging
two layer pouring water ports at the positions of a cylinder and a
flange respectively, so that pouring rate at the
flange is increased; employing a single-tank-double-hole pouring, with a pouring temperature of 1575-1585 DEG C; adopting a covering agent for heat-preservation after the casting head is poured full; and by using a hot-knockout process and loading the poured casting head on a furnace for full annealing heat treatment. Compared with a conventional method, the method provided by the invention has the beneficial effects that 1) the casting head employs eccentric arrangement, so that shrinkage defects at the position of the circular truncated cone on the
flange is solved; 2) inclusion defects caused by splash generated by too fast bottom casting speed can be prevented by arranging the
two layer pouring water ports; 3) crack defects are solved thoroughly, repair
welding amount is decreased, and production cost is reduced; and 4)
stock removal of the casting head is reduced, labor intensity and
pollution of the
cutting to environment is reduced,
utilization rate of the furnace is increased, and the quality of a casting member is improved.