Titanium continuous casting device

Patent metadata

Field	Value
Publication number	US-9682421-B2
Application number	US-201314648794-A
Country	US
Kind code	B2
Filing date	Dec 17, 2013
Priority date	Dec 28, 2012
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Provided is a device for titanium continuous casting ( 1 ) capable, even when continuously casting large diameter titanium ingots or titanium alloy ingots, of suppressing component segregation thereof. The device for titanium continuous casting ( 1 ) comprises: a mold ( 3 ) having an upper section having a circular upper opening ( 3 a ) for pouring in molten metal ( 6 ), and a bottom section having a lower opening for continuously drawing ingots ( 11 ); and a plurality of plasma torches ( 4, 5 ) to heat the molten metal in the mold ( 3 ) from the upper opening ( 3 a ) side. The plurality of plasma torches ( 4, 5 ) are disposed so that the amount of heat input to the molten metal ( 6 ) present in the outer circumference enclosing the center of the upper opening ( 3 a ) is greater than the amount of heat input to the molten metal ( 6 ) present in the center of the upper opening ( 3 a ).

First claim

The invention claimed is:

1. A titanium continuous casting device comprising
a mold which comprises an upper section comprising a circular upper opening for pouring in a molten metal of titanium or a titanium alloy, and a bottom section comprising a lower opening for continuously withdrawing an ingot of the titanium or the titanium alloy;
a first and a second plasma arc irradiation units each being disposed so as to be faced to the upper opening of said mold and to irradiate the upper opening of said mold with a plasma arc; and
a driving device which rotates at least said second plasma arc irradiation unit around a center of the upper opening of said mold,
wherein said first plasma arc irradiation unit is disposed nearer to the center of said upper opening than said second plasma arc irradiation unit is disposed, wherein said first plasma arc irradiation unit is disposed in a position deviated from the center of the upper opening of said mold when the titanium continuous casting device is viewed from the side of the upper opening of said mold, and said driving device rotates said first and said second plasma arc irradiation units around the center of the upper opening of said mold.

2. The titanium continuous casting device according to claim 1 , wherein
said first and said second plasma arc irradiation units are disposed in positions on a same straight line passing the center of the upper opening of said mold when the titanium continuous casting device is viewed from the side of the upper opening of said mold, oppositely to each other sandwiching said center, and
said driving device rotates the first and the second plasma arc irradiation units in a same direction.

3. The titanium continuous casting device according to claim 1 , wherein a plasma arc output of said second plasma arc irradiation unit is larger than a plasma arc output of said first plasma arc irradiation unit.

4. The titanium continuous casting device according to claim 3 , wherein said first and said second plasma arc irradiation units are a first and a second plasma torches respectively, and a plasma arc output of said second plasma torch is larger than a plasma arc output of said first plasma torch.

5. The titanium continuous casting device according to claim 3 , wherein said first plasma arc irradiation unit comprises at least one plasma torch, and said second plasma arc irradiation unit comprises plural plasma torches of a larger number than the number of the plasma torch of said first plasma arc irradiation unit.

6. A titanium continuous casting device comprising
a mold which comprises an upper section comprising a circular upper opening for pouring in a molten metal of titanium or a titanium alloy, and a bottom section having a lower opening for continuously withdrawing an ingot of the titanium or the titanium alloy;
plural plasma torches which heat the molten metal in said mold from the side of the upper opening of said mold by using a plasma arc, wherein said plural plasma torches are disposed such that a quantity of heat input to the molten metal present in an outer circumferential portion surrounding a central portion of said upper opening becomes large compared to a quantity of heat input to the molten metal present in the central portion of said upper opening, wherein a first plasma torch is disposed nearer to the center of said upper opening than a second plasma torch is disposed, and in a position deviated from a center of the upper opening of said mold when the titanium continuous casting device is viewed from the side of the upper opening of said mold, and a driving device rotates said first and said second plasma torches around the center of the upper opening of said mold.

7. The titanium continuous casting device according to claim 6 , wherein the central portion of the upper opening is a portion of a region within radius r/3 from the center of said upper opening, and the outer circumferential portion of said upper opening is a portion of a region of radius r/3 to r from the center of said upper opening, when r represents a radius of said upper opening.

8. The titanium continuous casting device according to claim 6 , wherein said plural plasma torches comprise plural rotation torches which are disposed in positions different from one another in a radial direction of said upper opening, rotatably around the center of said upper opening.

9. The titanium continuous casting device according to claim 6 , wherein said plural plasma torches comprise a first plasma torch disposed above the central portion of said upper opening and a second plasma torch disposed above the outer circumferential portion of said upper opening, and an output of said second plasma torch is larger than an output of said first plasma torch.

Assignees

• Kobe Steel Ltd
• Kobe Steel Ltd

Inventors

• Kanahashi Hidetaka
• Oyama Hideto
• Nakaoka Takehiro
• KUROSAWA Eisuke
• Tsutsumi Kazuyuki

Classifications

• B22D11/11

  Treating the molten metal · CPC title

• B22D21/005

  with high melting point, e.g. Be 1280 degrees C, Ti 1725 degrees C · CPC title

• B22D11/10

  Supplying or treating molten metal (B22D41/00 takes precedence) · CPC title

• B22D7/005

  from non-ferrous metals · CPC title

• B22D11/001 Primary

  of specific alloys · CPC title