| 摘要 |
<p>A gravity casting mold including a first mold, a second mold and an exhaust runner mold, which are combined with each other and form a turbine housing cavity having a twin scroll part, a first riser, a sprue, a runner, a second riser, an exhaust manifold cavity, third risers and gates. A heating sleeve is provided in the first riser so as to prevent shrinkage of the molten metal in the twin scroll part. The heating sleeve is closed in an upper end, with a gas ejection hole formed through the upper end of the heating sleeve. A sprue cup is provided in the sprue so as to maintain the temperature of the molten metal in the sprue. The gravity casting mold further includes a twin scroll mold, a main gate core, an exhaust runner core, a twin scroll part core and a bypass part core, and a sub-gate core.</p> |
