A process for casting aluminum alloy parts is disclosed. The process includes the steps as follows: raising a liquid aluminum alloy; filling a mold; increasing pressure; solidifying formed by at least two stages of different pressure settings; and relieving pressure.

An apparatus for countergravity casting a metallic material, has: a crucible for holding melted metallic material; a casting chamber for containing a mold; a fill tube capable of extending into the crucible to communicate melted metallic material to the casting chamber; and a gas source coupled to a headspace of the melting vessel to allow the gas source to pressurize the headspace to establish a pressure differential to force the melted metallic material upwardly through the fill tube into the mold. Extraneous sulfur is prevented from entering the molten metal from the surrounding environment.

An apparatus for countergravity casting a metallic material, has: a crucible for holding melted metallic material; a casting chamber for containing a mold; a fill tube capable of extending into the crucible to communicate melted metallic material to the casting chamber; and a gas source coupled to a headspace of the melting vessel to allow the gas source to pressurize the headspace to establish a pressure differential to force the melted metallic material upwardly through the fill tube into the mold. Extraneous sulfur is prevented from entering the molten metal from the surrounding environment.

According to a casting method, a molten metal is sustained at a sustain position between a casting and the next casting, and the molten metal flow is divided from one pouring gate (44) to a plurality of sprue runners (46 and 47) in the casting. The sprue runners (46 and 47) are branched by a V-shaped portion (45) in a V-shape, and the sustain position of the molten metal is set above (any one of P1, P2 and P4) the V-shaped portion (45). The V-shaped portion (45) is filled with the molten metal while a repeated casting is carried out.

The present invention relates to an arrangement for low-pressure casting of refractory metals, with a furnace chamber with one or a plurality of gas supply openings (6) and gas outlet openings (7), and a riser pipe (8) through a cover (5) of the furnace chamber, a melting container (3, 12) for the refractory metals arranged in the furnace chamber, and a heating device for heating the refractory metals in the melting container (3, 12). In the proposed arrangement, the melting container (3, 12) is formed as an exchangeable insert for a receiving mould (2) supporting the melting container (3, 12), which is arranged in the furnace chamber, wherein a thermally insulating layer (4, 17) is formed between the receiving mould (2) and the melting container (3, 12), or is integrated into the melting container (3, 12). With the proposed arrangement, a quick and easy exchange of the melting container for different alloys can also be carried out in the low-pressure casting of refractory metals.

The present invention relates to an arrangement for low-pressure casting of refractory metals, with a furnace chamber with one or a plurality of gas supply openings (6) and gas outlet openings (7), and a riser pipe (8) through a cover (5) of the furnace chamber, a melting container (3, 12) for the refractory metals arranged in the furnace chamber, and a heating device for heating the refractory metals in the melting container (3, 12). In the proposed arrangement, the melting container (3, 12) is formed as an exchangeable insert for a receiving mould (2) supporting the melting container (3, 12), which is arranged in the furnace chamber, wherein a thermally insulating layer (4, 17) is formed between the receiving mould (2) and the melting container (3, 12), or is integrated into the melting container (3, 12). With the proposed arrangement, a quick and easy exchange of the melting container for different alloys can also be carried out in the low-pressure casting of refractory metals.

The invention relates to a press for a casting machine and a casting machine with such a press. The press has a baseplate, an upper frame and a movable clamping platen, with two front columns and two rear columns arranged at the corner zones of the plates and at the corner zones of the upper frame. These columns extend through suitable through openings in the movable clamping platen and are fixed to the baseplate at the stationary upper frame. The press is characterized in that the front columns have a greater distance from one another than the rear columns. Because of this, essentially wider or longer permanent molds or those with side-protruding slides, up to a width corresponding to the increased distance apart of the front columns, may be inserted into the area between the baseplates and the movable clamping platen, and removed again. This means that better use can be made of the pressure and pressing capacity of the press, while the press is similarly or comparably simple, stable and compact in design and as advantageous for production and maintenance as conventional presses with columns arranged in a rectangle.

The invention relates to a press for a casting machine and a casting machine with such a press. The press has a baseplate, an upper frame and a movable clamping platen, with two front columns and two rear columns arranged at the corner zones of the plates and at the corner zones of the upper frame. These columns extend through suitable through openings in the movable clamping platen and are fixed to the baseplate at the stationary upper frame. The press is characterized in that the front columns have a greater distance from one another than the rear columns. Because of this, essentially wider or longer permanent molds or those with side-protruding slides, up to a width corresponding to the increased distance apart of the front columns, may be inserted into the area between the baseplates and the movable clamping platen, and removed again. This means that better use can be made of the pressure and pressing capacity of the press, while the press is similarly or comparably simple, stable and compact in design and as advantageous for production and maintenance as conventional presses with columns arranged in a rectangle.

An apparatus for countergravity casting a metallic has: a crucible for holding melted metallic material; a casting chamber for containing a mold; a fill tube capable of extending into the crucible to communicate melted metallic material to the casting chamber; and a gas source coupled to a headspace of the melting vessel to allow the gas source to pressurize said headspace to establish a pressure differential to force the melted metallic material upwardly through said fill tube into the mold. Added sulfur-gettering particles subsequently filtered or sulfur-gettering material removes sulfur from the melted metallic material.

An apparatus for countergravity casting a metallic has: a crucible for holding melted metallic material; a casting chamber for containing a mold; a fill tube capable of extending into the crucible to communicate melted metallic material to the casting chamber; and a gas source coupled to a headspace of the melting vessel to allow the gas source to pressurize said headspace to establish a pressure differential to force the melted metallic material upwardly through said fill tube into the mold. Added sulfur-gettering particles subsequently filtered or sulfur-gettering material removes sulfur from the melted metallic material.