Arrangement for low-pressure casting of refractory metals

Patent metadata

Field	Value
Publication number	US-11826820-B2
Application number	US-202017621501-A
Country	US
Kind code	B2
Filing date	Jun 23, 2020
Priority date	Jun 27, 2019
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

The present invention relates to an arrangement for low-pressure casting of refractory metals, with a furnace chamber with one or a plurality of gas supply openings ( 6 ) and gas outlet openings ( 7 ), and a riser pipe ( 8 ) through a cover ( 5 ) of the furnace chamber, a melting container ( 3, 12 ) for the refractory metals arranged in the furnace chamber, and a heating device for heating the refractory metals in the melting container ( 3, 12 ). In the proposed arrangement, the melting container ( 3, 12 ) is formed as an exchangeable insert for a receiving mould ( 2 ) supporting the melting container ( 3, 12 ), which is arranged in the furnace chamber, wherein a thermally insulating layer ( 4, 17 ) is formed between the receiving mould ( 2 ) and the melting container ( 3, 12 ), or is integrated into the melting container ( 3, 12 ). With the proposed arrangement, a quick and easy exchange of the melting container for different alloys can also be carried out in the low-pressure casting of refractory metals.

First claim

The invention claimed is:

1. Arrangement for a low-pressure casting of refractory metals, which has
a furnace chamber with one or a plurality of gas supply ( 6 ) and gas outlet ( 7 ) openings, and a riser pipe ( 8 ) through a cover ( 5 ) of the furnace chamber, onto which a casting mould ( 9 ) can be positioned,
a melting container ( 3 , 12 ) for the refractory metals, arranged in the furnace chamber, and
a heating device for heating the refractory metals in the melting container ( 3 , 12 ), wherein
the melting container ( 3 , 12 ) is designed as an exchangeable insert for a receiving mould ( 2 ), which supports the melting container ( 3 , 12 ) and is arranged in the furnace chamber, and a thermally insulating layer ( 4 , 17 ) is formed between the receiving mould ( 2 ) and the melting container ( 3 , 12 ), or is integrated into the melting container ( 3 , 12 );
wherein the melting container ( 3 , 12 ) is formed from an inner casing ( 3 ) of a ceramic or another heat-resistant material, an outer casing ( 12 ) of a ceramic or another heat-resistant material, and an intermediate fill ( 4 ) of a heat-resistant material as said thermally insulating layer ( 4 , 17 )
wherein a receiving opening of the receiving mould ( 2 ), and the melting container ( 3 , 12 ), have a conical shape; and
wherein the outer casing ( 12 ) is formed by a plurality of conical rings ( 15 ) on a base plate ( 16 ).

2. Arrangement according to claim 1 ,
characterised in that,
the receiving mould ( 2 ) is supported by a steel structure ( 1 ).

3. Arrangement according to claim 1 ,
characterised in that,
the furnace chamber is formed by a steel structure ( 1 ), and the receiving mould ( 2 ) is designed as cladding of the furnace chamber.

4. Arrangement according to claim 1 ,
characterised in that,
the receiving mould ( 2 ) is formed from a ceramic or another heat-resistant material, in which one or a plurality of induction coils ( 11 ) of the heating device are embedded.

5. Arrangement according to claim 1 , characterised in that,
the melting container ( 3 , 12 ) and the receiving mould ( 2 ) are formed such that the melting container ( 3 . 12 ) is removable downwards from the receiving mould ( 2 ), and a mechanism ( 14 ) is arranged on a base plate ( 13 ) of the furnace chamber, said mechanism can press the melting container ( 3 , 12 ) into the receiving mould ( 2 ) from below.

6. Arrangement according to claim 5 ,
characterised in that,
the base plate ( 13 ) of the furnace chamber is designed to be removable or detachable.

Assignees

• Fraunhofer Ges Forschung

Inventors

• Wohltmann Carsten
• Otto-Radtke Arne
• Haesche Marco
• Woestmann Franz-Josef
• Heuser Michael
• Eilers Jan

Classifications

• B22D18/04 Primary

  Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould · CPC title

• B22D21/022

  Casting heavy metals, with exceedingly high melting points, i.e. more than 1600 degrees C, e.g. W 3380 degrees C, Ta 3000 degrees C, Mo 2620 degrees C, Zr 1860 degrees C, Cr 1765 degrees C, V 1715 degrees C · CPC title

• F27B14/063

  Skull melting type · CPC title

• F27D11/06

  Induction heating, i.e. in which the material being heated, or its container or elements embodied therein, form the secondary of a transformer · CPC title

• F27B2014/0843

  Lining or casing · CPC title