Abstract: A manufacturing method for a cast bar and tube made of a magnesium alloy, includes steps of preparing a manufacturing device; depressurizing a vacuum chamber through a depressurization device; heating a vicinity of an opening of a hollow tube; inserting the opening of the hollow tube into a molten metal; switching a valve member to be open; introducing the molten metal into a cylindrical part, and filling the cylindrical part with the molten metal; cooling the hollow tube; and continuously vibrating the hollow tube until completing solidification of the molten metal in the cylindrical part.

Abstract: A manufacturing method for a cast bar and tube made of a magnesium alloy, includes steps of preparing a manufacturing device; depressurizing a vacuum chamber through a depressurization device; heating a vicinity of an opening of a hollow tube; inserting the opening of the hollow tube into a molten metal; switching a valve member to be open; introducing the molten metal into a cylindrical part, and filling the cylindrical part with the molten metal; cooling the hollow tube; and continuously vibrating the hollow tube until completing solidification of the molten metal in the cylindrical part.

Abstract: A manufacturing device for a cast bar and tube includes a molten metal furnace for holding a dissolved casting material, a hollow tube having a penetrating part of molten metal for penetrating molten metal, a depressurization device for reducing the pressure, a connection member for connecting the hollow tube to the depressurization device, and an open/close type valve member installed on the connection member. The penetrating part of molten metal is depressurized by switching the valve member to the closed state to reduce the pressure in the side of the depressurization device from the valve member using the depressurization device and inserting an opening of the hollow tube into the molten metal furnace as well as by switching the valve member to the open state.