Vertical Casting Apparatus and Vertical Casting Method

Abstract

The present invention is to provide a vertical casting apparatus capable of easily manufacturing castings without causing shrinkage cavities and entrainment of gas, by filling a molten metal into a mold cavity at a high speed and by effectively pressurizing the molten metal in the closed cavity, which has high work efficiency, ease of maintenance, and a low cost of equipment, and a vertical casting method using the vertical casting apparatus. The vertical casting apparatus is provided with an apparatus body comprising a fixed mold 1 on the lower side and a movable mold 2 on the upper side, a closing means 13 for closing a molten metal in-flow gate 10 formed in the fixed mold 1, and a pressurizing means 20 for pressurizing the molten metal in the closed mold cavity, and a casting means for supplying and filling the molten metal into the mold cavity from the underside. The casting means has a gas-pressurized molten metal pouring ladle 6 attachable to and detachable from the apparatus body.

Description

TECHNICAL FIELD [0001] The present invention relates to a vertical casting apparatus capable of manufacturing castings such as aluminum alloys, in which a molten metal is filled into a mold cavity from underside, and, more particularly, to a vertical casting apparatus in which a molten metal is supplied and filled into a mold cavity from the underside by using a gas-pressurized molten metal pouring ladle, and a vertical casting method using the vertical casting apparatus. BACKGROUND ART [0002] In the case where castings such as light alloy products, especially parts requiring strength, are manufactured, a vertical casting apparatus are used to prevent entrainment of gas at the time when molten metal is poured. [0003] In such a vertical casting apparatus, as a means for supplying molten metal into a mold cavity from a molten metal holding furnace while preventing the mixing of oxides and the entrainment of gas, use of a low-pressure gas is already known (see Japanese Laid-Open Patent...

AI Technical Summary

Benefits of technology

[0011] Further, the present invention relates to (10) a vertical casting method using the vertical casting apparatus according to any one of (1) to (9), comprising the steps of casting a molten metal into the mold cavity from the gas-pressurized molten metal pouring ladle through the casting stoke; and closing the molten metal in-flow gate formed in the fixed mold by the closing means after the molten metal has been filled into the cavity; and subsequently pressurizing the molten metal in the mold cavity by a pressurizing means; (11) the vertical casting method according to (10), comprising the steps of releasing immediately the gas pressure in the gas-pressurized molten metal pouring ladle to the atmosphere, and detaching the gas-pres

Problems solved by technology

However, although the low-pressure gas is effective in supplying molten metal quantitatively into a mold, only the use of low-pressure gas is not sufficient to avoid shrinkage cavities occurring at the time of solidification of molten metal and defective thin-wall products because the casting speed is slow and the pressure is low.

Also, in a conventional apparatus, a large amount of molten metal was accommodated in a molten metal holding furnace fixed to an apparatus body, which increased the size of apparatus.

Further, it is not ea

Images