Clustered investment-casting shells for casting thin-walled golf club-heads of titanium alloy

A method for casting titanium-alloy club-heads for golf clubs, the method comprising:

• preparing an investment-casting shell comprising at least one cluster of at least ten casting molds for casting respective club-heads, each casting mold having a head-volume greater than 400 cm3, at least one wall having a thickness of less than 0.8 mm, at least one respective gate, and at least one runner connecting together the at least one respective gate of each mold, wherein the at least one respective gate and at least one runner have an interface gating ratio ranging from 0.7 to 1.3;
• at a preset force, introducing molten titanium alloy into the investment-casting shell and into the at least one cluster;
• flowing the molten titanium alloy in the at least one runner through the at least one respective gate and into the individual casting molds to fill the casting molds with titanium alloy and thus cast the respective club-heads;
• and
• producing a cast-product yield of greater than 80% at a material usage of less than 600 g, including process losses per casting mold.

A method for casting titanium-alloy club-heads for golf clubs, the method comprising:

• preparing an investment-casting shell comprising a cluster of at least four casting molds for respective club-heads, each casting mold having a head-volume greater than 400 cm3 and defining a least one club-head wall of thickness less than 0.8 mm each casting mold defines at least one respective main gate through which molten titanium alloy is introduced into the casting mold, wherein the investment-casting shell is prepared such that the at least one main gate and at least one runner have an interface gating ratio ranging from 0.7 to 1.3;
• preheating the investment-casting shell to a temperature of at least 500° C.;
• at a preset force, introducing molten titanium alloy into the investment-casting shell;
• flowing the molten titanium alloy into the individual casting molds to fill the casting molds with titanium alloy and thus cast the respective club-heads;
• rotating the investment-casting shell at a rotational speed of at least 300 rotations per minute to produce a cast-product yield of greater than 80% at a material usage of less than 500 g, including process losses per casting mold.