EP0739667B1 - Method of casting metal and apparatus therefor - Google Patents
Method of casting metal and apparatus therefor Download PDFInfo
- Publication number
- EP0739667B1 EP0739667B1 EP96302915A EP96302915A EP0739667B1 EP 0739667 B1 EP0739667 B1 EP 0739667B1 EP 96302915 A EP96302915 A EP 96302915A EP 96302915 A EP96302915 A EP 96302915A EP 0739667 B1 EP0739667 B1 EP 0739667B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mould
- mould chamber
- chamber
- molten metal
- melting furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
Description
- lowering said outer cover to close said outer mould chamber and to bring said outer mould chamber into close contact with said levitation melting furnace;
- lowering said inner cover to close said inner mould chamber;
- lowering said inner mould chamber toward said levitation melting furnace to immerse the end of said suction pipe into the molten metal;
- blowing an inert gas at an increased pressure into the space above the levitation melting furnace to cause molten metal to rise up through the suction pipe and to be cast into the mould;
- withdrawing the suction pipe from the molten metal by raising said inner mould chamber; and
- raising said outer mould chamber from said levitation melting furnace.
Claims (10)
- A method of casting a molten metal comprising the steps of:levitation-melting a metal in an inert atmosphere in a levitation melting furnace (1) under atmospheric pressure, thereby forming molten metal (5);providing a mould chamber positioned above the furnace, and a gas-permeable mould (2) housed within said mould chamber, said mould chamber further including a suction pipe (3) for delivering molten metal to said mould;reducing the pressure in said mould chamber (41,42) and a space (A) above the levitation melting furnace (1) to below atmospheric pressure;lowering said mould chamber (41) and said gas permeable mould toward said levitation melting furnace (1) to immerse an end of said suction pipe (3) into the molten metal (5), the other end of the suction pipe being in communication with the mould (2);raising said mould chamber (4) to withdraw the suction pipe (3) from the molten metal (5); andreturning the pressure in the space (A) above the levitation melting furnace (1) and in the mould chamber (41,42) to atmospheric pressure;lowering said outer cover (421) to close said outer mould chamber (42) and to bring said outer mould chamber into close contact with said levitation melting furnace (1) ;lowering said inner cover (411) to close said inner mould chamber (41);lowering said inner mould chamber (41) toward said levitation melting furace (1) to immerse the end of said suction pipe (3) into the molten metal (5);blowing an inert gas at an increased pressure into the space (A) above the levitation melting furnace (1) to cause molten metal to rise up through the suction pipe and to be cast into the mould (2);withdrawing the suction pipe (3) from the molten metal (5) by raising said inner mould chamber (4); andraising said outer mould chamber (42) from said levitation melting furnace (1).
- A method as claimed in claim 1, wherein the pressure in the double-structure mould chamber (41,42) and the space (A) above the levitation melting furnace (1) is reduced to below 26.7 kPa (200 torr).
- A method as claimed in claim 2, wherein the pressure is reduced to below 1.33 kPa (100 torr).
- A method as claimed in any of claims 1, 2 or 3, wherein the molten metal (5) is cast into the mould (2) under a pressure increase of between 6.67-66.7 kPa (50 to 500 torr).
- Apparatus for casting a molten metal comprising a levitation melting furnace (1), a mould chamber (41,42) arranged above the levitation melting furnace and a gas-permeable mould (2) housed within said mould chamber, said mould chamber further including a suction pipe (3) for delivering molten metal to the mould having one end in communication with the mould and the other end arranged to be lowered into the levitation melting furnace, characterised in that said mould chamber comprises a double-structure mould comprising an outer mould chamber (42) having an outer cover (421) to close the outer mould chamber, an inner mould chamber (41) having an inner cover (411) to close the inner mould chamber, said inner mould chamber (41) housing said mould (2) and including said suction pipe (3) for delivering molten metal to said mould (2), and in that an atmosphere control mechanism (12, 120) is provided to blow an inert gas into a space (A) above the levitation melting furnace (1) to cause molten metal to rise up through the suction pipe.
- Apparatus as claimed in claim 5, wherein a sliding mechanism is provided to lower the inner and outer mould chambers of the double-structured mould chamber (41,42) toward the levitation melting furnace (1).
- Apparatus as claimed in claim 6, wherein the sliding mechanism is resiliently biased to urge the mould chamber (41,42) away from the levitation melting furnace (1).
- Apparatus as claimed in any of claims 5, 6 or 7, wherein the inner and outer mould chambers are slidably coupled together.
- Apparatus as claimed in any of claims 5 to 8, wherein a mould keeper (412) is provided to retain the mould (2) in position.
- Apparatus as claimed in any of claims 5 to 9, wherein the atmosphere control mechanism (12,120) comprises a pump, an exhaust port (120) and an inlet (12).
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10147695 | 1995-04-25 | ||
JP10147695 | 1995-04-25 | ||
JP101476/95 | 1995-04-25 | ||
JP7153008A JP2830777B2 (en) | 1995-04-25 | 1995-06-20 | Metal casting method and apparatus |
JP15300895 | 1995-06-20 | ||
JP153008/95 | 1995-06-20 | ||
US08/637,416 US5722481A (en) | 1995-06-20 | 1996-04-25 | Method for casting metal and apparatus therefor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0739667A1 EP0739667A1 (en) | 1996-10-30 |
EP0739667B1 true EP0739667B1 (en) | 2001-11-07 |
Family
ID=27309472
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96302915A Expired - Lifetime EP0739667B1 (en) | 1995-04-25 | 1996-04-25 | Method of casting metal and apparatus therefor |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0739667B1 (en) |
JP (1) | JP2830777B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112935223A (en) * | 2019-12-11 | 2021-06-11 | 科华控股股份有限公司 | Structure for preventing sealing failure by modifying vacuum suction casting profiling cylinder outside suction casting chamber |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3544757A (en) * | 1967-05-15 | 1970-12-01 | Material Transformation Associ | Method of melting a levitated mass |
JPS5954458A (en) * | 1982-09-20 | 1984-03-29 | Hitachi Ltd | Method and device for casting by bottom running of molten metal |
US4738713A (en) * | 1986-12-04 | 1988-04-19 | The Duriron Company, Inc. | Method for induction melting reactive metals and alloys |
JPH02284756A (en) * | 1989-03-17 | 1990-11-22 | Pcast Equip Corp | Casting device and its method |
JP2541341B2 (en) * | 1990-05-15 | 1996-10-09 | 大同特殊鋼株式会社 | Precision casting method and precision casting apparatus for Ti and Ti alloy |
JP2576685B2 (en) * | 1990-11-19 | 1997-01-29 | 大同特殊鋼株式会社 | Precision casting equipment |
JPH05131265A (en) * | 1991-11-08 | 1993-05-28 | Daido Steel Co Ltd | Pipe joint and production thereof |
-
1995
- 1995-06-20 JP JP7153008A patent/JP2830777B2/en not_active Expired - Fee Related
-
1996
- 1996-04-25 EP EP96302915A patent/EP0739667B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP2830777B2 (en) | 1998-12-02 |
JPH0910917A (en) | 1997-01-14 |
EP0739667A1 (en) | 1996-10-30 |
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