Rotary-mold gravity casting process

A rotary-mold gravity casting process comprising the steps of:

• preparing a casting mold having a cavity therewithin, a runner connected to the cavity, and a hopper for pouring a molten metal fixed to the mold and provided with an upper inlet and a lower outlet, said lower outlet of the hopper being connected to the runner;
• pouring the molten metal into said hopper through said upper inlet while holding said hopper and said casting mold in a holding state wherein said molten metal poured into the hopper fills said runner and prevents communication of said cavity with a space beyond the level of metal in said hopper;
• and
• then turning said casting mold and the hopper from said holding state to pour the molten metal from the hopper into the cavity in the casting mold through the runner using a difference in height developed by the turning of said casting mold and said hopper between a molten metal level in the hopper and a molten metal level in the casting mold, while maintaining the runner filled with the molten metal.