Gas pressure controlled casting mold

Patent metadata

Field	Value
Publication number	US-9561539-B2
Application number	US-200813000086-A
Country	US
Kind code	B2
Filing date	Jun 30, 2008
Priority date	Jun 30, 2008
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A gas pressure controlled casting mold is disclosed having a hot-top introducing a molten metal of aluminum or aluminum alloy, and a mold body which passes the molten metal of aluminum or aluminum alloy introduced from the hot-top through a molten metal passage portion for cooling and solidification and semi-continuously or continuously casting a billet of aluminum or aluminum alloy. A wall surface of the molten metal passage portion of the mold body is provided with a plurality of lubricating oil blow-out holes for blowing out a lubricating oil. A lubricating oil supply passage is communicatively connected to each lubricating oil blow-out hole and is independently formed at least in a range of a heat affected portion in the mold body. This allows the mold body to be reliably cooled regardless of the difference in the temperature and casting speed conditions and thus can achieve favorable continuous casting.

First claim

The invention claimed is:

1. A gas pressure controlled casting mold, comprising:
a hot-top introducing a molten metal of aluminum or aluminum alloy;
a mold body having an outer circumferential surface and defining a molten metal passage portion having an inner wall surface, wherein the mold body passes the molten metal of aluminum or aluminum alloy introduced from the hot-top through the molten metal passage portion to cool and solidify and semi-continuously or continuously cast a billet of aluminum or aluminum alloy;
a gas passage hole for passing a gas located on the inner wall surface of the molten metal passage portion of the mold body;
a gas supply inlet for supplying the gas located on the outer circumferential surface;
a gas passage having a substantially uniform cross section extending in a horizontal direction relative to a vertical axis of the mold body and communicatively connected from the gas supply inlet to the gas passage hole;
a meniscus portion space formed among an upper end of the mold body, the hot-top, and a molten metal meniscus portion; and
a trap mechanism configured to trap a lubricating oil in the meniscus portion space flowing back into the gas passage from the gas passage hole, when a gas pressure in the meniscus portion space is increased,
wherein the gas passage is coaxially aligned with both the gas supply inlet and the gas passage hole.

2. A gas pressure controlled casting mold, comprising
a hot-top introducing a molten metal of aluminum or aluminum alloy;
a mold body having an outer circumferential surface and defining molten metal passage portion having an inner wall surface, wherein the mold body passes the molten metal of aluminum or aluminum alloy introduced from the hot-top through the molten metal passage portion to cool and solidify and semi-continuously or continuously cast a billet of aluminum or aluminum alloy;
a plurality of lubricating oil blow-out holes for blowing out a lubricating oil arranged circumferentially at equal intervals on the inner wall surface of the molten metal passage portion;
a plurality of gas passage holes for passing a gas arranged circumferentially at equal intervals on the inner circumferential surface of the molten metal passage portion;
a plurality of lubricating oil supply passages extending from the outer circumferential surface and passing through the mold body, each lubricating oil supply passage connecting to one of the plurality of lubricating oil blow-out holes, respectively;
a plurality of gas passages extending from the outer circumferential surface and passing through the mold body, each gas passage connecting to one of the plurality of gas passage holes;
a meniscus portion space formed among an upper end of the mold body, the hot-top, and a molten metal meniscus portion;
a trap mechanism configured to trap the lubricating oil together in the meniscus portion space flowing back into the gas passage from the gas passage hole, when a gas pressure in the meniscus portion space is increased; and
a ring-shaped cover plate arranged on a top surface of the mold body to be concentric to the molten metal passage portion, the ring-shaped cover plate covering the plurality of lubricating oil supply passages and the plurality of gas passages,
wherein each of the plurality of lubricating oil supply passages is not connected to any other lubricating oil supply passage by an annular groove, but is connected independently to the one of the plurality of lubricating oil blow-out holes,
wherein each of the plurality of gas passages is not connected to any other gas passage by an annular groove, but is connected independently to the one of the plurality of gas passage holes,
wherein each of the plurality of lubricating oil blow-out holes is spaced apart from each of the plurality of gas passage holes,
wherein each of the plurality of lubricating oil blow-out holes is provided horizontally on a same level with each of the plurality of gas passage holes relative to a vertical axis of the mold body, and
wherein the plurality of lubricating oil supply passages and the plurality of gas passages extend horizontally on a same plane relative to the vertical axis of the mold body, such that the lubricating oil and the gas are independently supplied to the molten metal in different directions from each other.

3. A gas pressure controlled casting mold comprising:
a hot-top introducing a molten metal of aluminum or aluminum alloy;
a mold body having an outer circumferential surface and defining a molten metal passage portion having an inner wall surface, wherein the mold body passes the molten metal of aluminum or aluminum alloy introduced from the hot-top through the molten metal passage portion to cool and solidify and semi-continuously or continuously cast a billet of aluminum or aluminum alloy;
a ring plate provided substantially concentric to the molten metal passage portion on an upper surface of the mold body to be detachable from the mold body;
a plurality of lubricating oil blow-out holes, arranged on an inner circumferential surface side on a lower surface of the ring plate, for blowing out a lubricating oil arranged circumferentially at equal intervals in the ring plate;
a plurality of gas passage holes, arranged on the inner circumferential surface side on the lower surface of the ring plate, for passing a gas arranged circumferentially at equal intervals in the ring plate;
a plurality of lubricating oil supply passages extending from an outer circumferential surface and passing through the mold body, each lubricating oil supply passage connecting to one of the plurality of lubricating oil blow-out holes in the ring plate;
a plurality of gas passages extending from the outer circumferential surface and passing through the mold body, each gas passage connecting to one of the plurality of gas passage holes in the ring plate;
a meniscus portion space formed among an upper end of the mold body, the hot-top, and a molten metal meniscus portion; and
a trap mechanism configured to trap the lubricating oil in the meniscus portion space flowing back into the gas passage from the gas passage hole, when a gas pressure in the meniscus portion space is increased,
wherein each of the plurality of lubricating oil supply passages is not connected to any other lubricating oil supply passage by an annular groove, but connected independently to each of the plurality of lubricating oil blow-out holes,
wherein each of the plurality of gas passages is not connected to any other gas passage by an annular groove, but is connected independently to the one of the plurality of gas passage holes, and
wherein each of the plurality of lubricating oil blow-out holes is spaced apart from each of the plurality of gas passage holes, and is provided horizontally on a same level with each of the plurality of gas passage holes relative to a vertical axis of the mold body, such that the lubricating oil and the gas are independently supplied to the molten metal introduced through the molten metal passage portion in different directions from each other.

4. The gas pressure controlled casting mold according to claim 3 , wherein any one or both of the mold body and the ring plate is formed of copper or copper alloy.

5. The gas pressure controlled casting mold according to claim 2 , further comprising:
a refrigerant passage formed in the mold body; and
a blow-out hole or a blow-out slit formed at a lower end of the molten metal passage portion for blowing out a refrigerant flowing through the refrigerant passage toward a solidified shell of aluminum or aluminum alloy continuously formed by the molten metal passage portion of the mold body; wherein
the blow-out hole or the blow-out slit for the refrigerant and the refrigerant passage in the mold body are connecte

Assignees

• Sugita Kaoru
• Fujita Takeshi
• Sagisaka Eikichi
• Nippon Light Metal Co

Inventors

• Sugita Kaoru
• Fujita Takeshi
• Sagisaka Eikichi

Classifications

• B22D11/07

  Lubricating the moulds · CPC title

• B22D11/049

  for direct chill casting, e.g. electromagnetic casting · CPC title

• B22D11/0401 Primary

  Moulds provided with a feed head · CPC title