US 10,441,998 B2 · Casting method and casting device

Abstract

Molten metal M is raised to the vicinity of a gate 11 of a cavity 9C by increasing the pressure in a holding furnace 5 with gas, and thereafter the cavity 9C is filled with the molten metal M by decreasing the pressure in the cavity 9C by suction and further increasing the pressure in the holding furnace 5. Thereafter, the decompression of the cavity 9C is stopped after a preset filling time, and the compression of the holding furnace 5 is stopped when solidification of the molten metal M is completed. In this way, the suction is minimized, and it becomes possible to employ a simple decompression part 14. A reduction in equipment cost and production cost is thereby achieved, and a reduction in casting cycle time is also achieved.

Claims9

Dependent claims

A casting method for molding a product based on low-pressure casting by using a casting device in which a mold with a cavity is disposed over a holding furnace storing molten metal, comprising the steps of:

raising the molten metal to a vicinity of a gate of the cavity by increasing a pressure in the holding furnace and thereafter filling the cavity with the molten metal by decreasing a pressure in the cavity by suction and simultaneously further increasing pressure applied to the holding furnace to increase the pressure in the holding furnace;
stopping decompression of the cavity after a preset filling time;
and
stopping compression of the holding furnace when solidification of the molten metal is completed, and
wherein in the step of filling the cavity with the molten metal by decreasing the pressure in the cavity by suction and simultaneously further increasing pressure applied to the holding furnace, the pressure of the holding furnace increases more rapidly than during the step of raising the molten metal to the vicinity of the gate of the cavity by increasing the pressure in the holding furnace.

2 more elements

raising the molten metal to a vicinity of a gate of the cavity by increasing a pressure in the holding furnace and thereafter filling the cavity with the molten metal by decreasing a pressure in the cavity by suction and simultaneously further increasing pressure applied to the holding furnace to increase the pressure in the holding furnace;
stopping decompression of the cavity after a preset filling time;
and
stopping compression of the holding furnace when solidification of the molten metal is completed,
wherein a first rate at which the pressure in the holding furnace increases during the step of raising the molten metal to the vicinity of the gate of the cavity is slower than a second rate at which the pressure in the holding furnace increases during the step of filling the cavity with the molten metal by decreasing the pressure in the cavity by suction and simultaneously further increasing pressure applied to the holding furnace.

2 more elements

Dependencies are inferred from the claim text.

Casting method and casting device

Life of this patent

Casting method and casting device

Life of this patent

Abstract

Claims9