A method for manufacturing a low-density steel wooden golf head solves the difficulty in reducing the thickness of a conventional wooden golf head. The method includes placing a shell mold having a crucible portion and a cavity portion in communication with the crucible portion on a rotary table, placing a metal ingot into the crucible portion, followed by melting the metal ingot in molten metal in a vacuum environment, rotating the rotary table to cause the molten metal to flow into the cavity portion under a centrifugal force, gradually slowing down the rotary table after the molten metal cools and solidifies, destroying the shell mold to obtain a casting including a cast product portion, and separating the cast product portion from the casting to obtain a casting product of a wooden golf head having a density of 6.5-7.6 g/cm.sup.3 and a minimum thickness of 0.4-0.6 mm.

A method of assembling a centrifugal casting apparatus includes positioning a wedge on a rotatable axis and positioning at least two molds into sealing engagement with the wedge. Each of the at least two molds includes a front face and defines at least two cavities extending from the front face into the mold. A sprue chamber is defined and is structured to receive molten material, and at least a portion of the sprue chamber is defined by at least a portion of the front faces of the at least two molds.

A method includes placing a shell mold with a crucible portion and a casting portion in communication with the crucible portion on a rotary table, with the heterogeneous material including an embedded portion inlaying in the casting portion of the shell mold and a non-embedded portion locating in a cavity of the casting portion, placing a metal ingot into the crucible portion, followed by melting the metal ingot into molten metal in a vacuum environment, rotating the rotary table, causing the molten metal to flow into the cavity, destroying the shell mold after the molten metal solidifies to obtain a casting including a cast product portion separated from the casting to obtain a cast product of a golf club head, and removing the embedded portion of the heterogeneous material protruding from an outer periphery of the cast product of the golf club head.

A centrifugal casting apparatus includes a mold holder placed on a freely rotatable rotary table, and a mold put into and held by the mold holder. The mold holder includes a mold holder body made of a metal material and having a bottomed cylindrical shape, heat insulation members provided on an inner peripheral surface and a bottom surface of the mold holder body, and mold positioning members each made of a ceramic and provided to protrude from the heat insulation member on the bottom surface of the mold holder body. The mold includes a mold body having a cavity into which a molten metal is to be poured, and a mold base provided to the mold body and having mold positioning member insertion holes engageable with the mold positioning members.

A centrifugal casting apparatus includes a mold holder placed on a freely rotatable rotary table, and a mold put into and held by the mold holder. The mold holder includes a mold holder body made of a metal material and having a bottomed cylindrical shape, heat insulation members provided on an inner peripheral surface and a bottom surface of the mold holder body, and mold positioning members each made of a ceramic and provided to protrude from the heat insulation member on the bottom surface of the mold holder body. The mold includes a mold body having a cavity into which a molten metal is to be poured, and a mold base provided to the mold body and having mold positioning member insertion holes engageable with the mold positioning members.

The present disclosure relates to an apparatus to cast tubes of sluggish material and a process thereof. The apparatus comprises at least one cylindrical casting mold, heating means, at least one set of rollers, a driving member, at least one tank, a spray nozzle, at least one tundish, a reinforced snout, cooling means and a drive control unit. The mold is configured to receive the molten sluggish material therein. The rollers are configured to abut an operative outer surface of the casting mold. The driving member is configured to spin the casting mold in an operative configuration of the apparatus to cast the tube of a predetermined inner diameter (ID), outer diameter (OD) and a predetermined length. Since, the addition of fluidity enhancer increases the fluidity of the molten sluggish material inside the mold, advantageously the smaller diameter of the tubes are easily produced by this process.

Disclosed herein is a casting cluster for casting a body of a golf club head made of titanium or a titanium alloy. The casting cluster comprises a receptor and a plurality of runners coupled to the receptor and configured to receive molten metal from the receptor. The casting cluster also includes at least twenty-eight main gates. At least two of the main gates are coupled to each of the runners and each main gate is configured to receive molten metal from a corresponding one of the plurality of runners. The casting cluster further comprises at least twenty-eight molds. Each mold of the at least twenty-eight molds is configured to receive molten metal from a corresponding one of the main gates and to cast a body of a golf club head that has a volume of at least 100 cm.sup.3.

A cooling device (21) includes radiation thermometers (51 to 55), a plurality of nozzle parts, a plurality of electromagnetic valves (V.sub.1 to V.sub.5), and a control device (60). The radiation thermometers detect pre-cooling temperatures that are temperatures at a plurality of places on the mold before cooling water is sprayed from the plurality of nozzle parts to the mold. The control device individually sets a cooling time to each of the plurality of places on the mold based on a deviation between the pre-cooling temperature at the place on the mold and a target temperature and controls the electromagnetic valves based on the cooling times individually set to the plurality of respective places on the mold.

A cooling device (21) includes radiation thermometers (51 to 55), a plurality of nozzle parts, a plurality of electromagnetic valves (V.sub.1 to V.sub.5), and a control device (60). The radiation thermometers detect pre-cooling temperatures that are temperatures at a plurality of places on the mold before cooling water is sprayed from the plurality of nozzle parts to the mold. The control device individually sets a cooling time to each of the plurality of places on the mold based on a deviation between the pre-cooling temperature at the place on the mold and a target temperature and controls the electromagnetic valves based on the cooling times individually set to the plurality of respective places on the mold.

A casting system (10) includes a plurality of mold tables (41 and 42), molten metal pouring trucks (21 and 22), and a molten metal supply furnace (30). The mold tables are each provided with centrifugal casting molds (81 to 84 and 91 to 94). Each molten metal pouring truck can move to the position of each mold table and pour molten metal into the molds installed on the mold table. The molten metal supply furnace supplies molten metal to the molten metal pouring trucks.