EP0009028A1 - Improvements in or relating to casting metal ingots - Google Patents
Improvements in or relating to casting metal ingotsInfo
- Publication number
- EP0009028A1 EP0009028A1 EP79900170A EP79900170A EP0009028A1 EP 0009028 A1 EP0009028 A1 EP 0009028A1 EP 79900170 A EP79900170 A EP 79900170A EP 79900170 A EP79900170 A EP 79900170A EP 0009028 A1 EP0009028 A1 EP 0009028A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hot
- wall
- mold
- ingot mold
- ingot
- 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.)
- Withdrawn
Links
- 239000002184 metal Substances 0.000 title claims abstract description 35
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 35
- 238000005266 casting Methods 0.000 title claims abstract description 12
- 230000004888 barrier function Effects 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000002657 fibrous material Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 230000004927 fusion Effects 0.000 claims description 2
- 238000005058 metal casting Methods 0.000 claims description 2
- 239000012768 molten material Substances 0.000 claims description 2
- 229910010293 ceramic material Inorganic materials 0.000 claims 2
- 239000000835 fiber Substances 0.000 claims 1
- 230000002401 inhibitory effect Effects 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- KKEBXNMGHUCPEZ-UHFFFAOYSA-N 4-phenyl-1-(2-sulfanylethyl)imidazolidin-2-one Chemical compound N1C(=O)N(CCS)CC1C1=CC=CC=C1 KKEBXNMGHUCPEZ-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
- B22D7/10—Hot tops therefor
- B22D7/102—Hot tops therefor from refractorial material only
Definitions
- the present invention concerns casting metals in an ingot mold with the use of a so-called hot-top positioned on th.e mold to reduce pipe-formation in the solidified ingot.
- the present invention consists in a method of casting metal ingots comprising teeming the molten metal in an ingot mold with a hot-top, the hot-top having a metal inner wall which is thin co pared to the thickness of the mold wall and which is surrounded by a heat insulating barrier, the resulting thermal expansion of the hot-top forming a gap between the inner wall of the hot-top and the shell of solidified metal on the ingot without external manipulation.
- the invention in a second aspect consists in a hot-top for use with an ingot mold in the casting of metal ingots, the hot-top comprising a hollow body having a base adapted to be positioned at the upper end of an ingot mold and comprising an inner wall of heat conductive metal surrounded by a heat insulating barrier.
- the invention consists in the combination of a hot-top as set forth inbefore with an ingot mold, where- in the thickness of the inner wall of the hot-top is chosen in relation to the capacity of the ingot mold in such a manner as to prevent melting or fusion of the inner wall during casting molten material in the mold, and wherein the inner wall is thin compared to the thickness of the mold wall.
- the invention consists in an ingot mold comprising a hot-top, the hot-top having an inner wall which is thin compared to-the thickness of the mold wall and is made of heat conductive material having a higher melting point than the material of the mold wall, said inner wall being surrounded by a heat insulating barrier and being positioned inside the upper part of the ingot mold, the said heat insulating barrier being formed between said inner wall and the wall of the said upper part of the ingot mold.
- Figure 1 is a cross section through an ingot mold and an associated hot-top according to a first embodiment of the invention
- figure 2 is a cross section through an ingot mold with a hot-top according to another embodiment of the invention
- figure 3 is a cross section through an ingot mold with incor- porated hot-top according to still another embodiment of the invention.
- Figure 1 shows an ingot mold 1, a hot-top 2 and a cover plate 3 and is divided into two by a line A so that two stages of the casting process can be shown.
- the left hand side of the figure shows the mold just after molten metal 4 has been poured into the mold.
- the molten metal will normally be steel or iron, though non-ferrous metals may also be cast in a similar manner.
- the hot-top 2 has a metal inner wall 5 having a thickness which is small compared to that of the mold walls.
- the inner wall 5 is surrounded by a heat barrier 6 made from a (heat resistant) ceramic fiber material. It is essential that the thickness of the inner wall 5 be chosen in relation to the capacity of the mold 1 such that the wall will not melt or become fused with the poured molten metal.
- the inner wall 5 should have a melting point which is not more than 300 C below the casting temperature of the molten metal.
- the inner wall 5 may be 10 to 30 mm thick.
- a suitable metal is cast iron but of course the material of the inner v / all will depend on the metal being cast. As shown in figure 1 the hot-top tapers from its base to its open top which is closed by the top cover 3. This taper is not, however, essential.
- An additional heat barrier 9 is provided around the lower edge of the inner wall 5 to prevent heat transfer between the inner wall and the ingot mold. This additional heat barrier may not always be needed.
- the hot-top is surrounded by a metal head case 10 provided with lifting lugs by means of which the hot-top and head case can be mounted on or removed from the ingot mold.
- the metal may be poured either uphill or downhill.
- the cover plate 3 which may be as described in U.K. patent specification No. 1,496,348, is placed on the hot-top after pouring.
- FIG. 1 shows the molten metal immediately after teeming. Shortly after the poured metal contacts the inner wall 5 a thin outer layer or shell of solidified metal is formed on the poured metal due to heat being conducted away from the molten metal by the mold 1 and the inner wall 5 of the hot-top.
- the metal is then allöwed to cool until it is solid. This is the situation shown in the right hand side of figure 1.
- the hot-top 2 and the cover 3 re ain in position throughout the en- tire cooling process.
- the gap 7, together with the insulation provided by the heat barrier 6, ensure that the upper portion of the ingot does not cool too rapidly with respect to the re-mainder of the ingot. Furthermore, there is no need to intro- cute exothermic material into the gap 7 during cooling of the cast metal because of the thermal insulation provided by the gap 7 and heat barrier 6.
- the hot-top described is reusable and also avoids the necessity of Special Provision being made to move the hot-top mechanically during the casting Operation.
- the hot-top may be advantageous to position means for causing extra thermal expansion of the hot-top when it is heated during teeming.
- the sections of the hot-top may be separated by Strips of a material having a high degree of thermal expansion such as copper, or a bimetallic substance.
- the inner surface of the hot-top may be coated with a heat reflective or a parting agent.
- Figure 2 shows a hot-top positioned inside the upper part of an ingot mold 21.
- An inner wall part 51 rests on a shoulder
- the mold wall and is surrounded by a heat insulating barrier 61 corresponding to heat barrier 6 described above.
- the outer wall of the hot-top is constituted by the wall of the ingot mold itself, which leads to a simplified structure of the co-combination.
- a heat barrier " 91 can be inserted between the lower edge of wall 41 and the shoulder of the ingot mold.
- the wall part 51 of the hot-top is made of a material such as steel hav ⁇ ing a higher melting point than the material of the input mold itself which is generally cast-iron.
- Figure 3 shows an embodiment si ilar to that of figure 2 where ⁇ in an inner wall part 52 has a base part 53 which is incorporating in the wall of the ingot mold 22.
- the inner wall of the hot-top is maintained at its lower edge in a given position with respect to the ingot mold, but its upper edge can expand to achieve the desired effect.
- a heat barrier 62 is again inserted between the ingot mold wall and the inner wall part 52.
- the embodiment of figure 3 provides an ingot mold in which the hot-top wall is incorporated at the time of making the ingot mold itself and does therefore not require an additional manufacturing step.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4957/78A GB1595737A (en) | 1978-02-07 | 1978-02-07 | Casting metal ingots |
| GB495778 | 1978-02-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0009028A1 true EP0009028A1 (en) | 1980-03-19 |
Family
ID=9787080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP79900170A Withdrawn EP0009028A1 (en) | 1978-02-07 | 1979-08-28 | Improvements in or relating to casting metal ingots |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0009028A1 (enrdf_load_stackoverflow) |
| JP (1) | JPS55500084A (enrdf_load_stackoverflow) |
| BR (1) | BR7906448A (enrdf_load_stackoverflow) |
| DE (1) | DE2934887T1 (enrdf_load_stackoverflow) |
| FR (1) | FR2448951A1 (enrdf_load_stackoverflow) |
| GB (1) | GB1595737A (enrdf_load_stackoverflow) |
| SE (1) | SE431833B (enrdf_load_stackoverflow) |
| WO (1) | WO1979000596A1 (enrdf_load_stackoverflow) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU6488980A (en) * | 1979-11-13 | 1981-06-03 | International Ferrox Company Establishment | Ingot mould comprising a hot-top positioned inside the upper part of the mould and process for manufacturing said mould |
| US4721278A (en) * | 1986-10-14 | 1988-01-26 | Re-Top Usa, Inc. | Lightweight reusable hot top |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1696986A (en) * | 1926-01-19 | 1929-01-01 | Max R Trembour | Hot top for molds |
| US1738600A (en) * | 1928-10-31 | 1929-12-10 | James Thomas | Hot top |
| DE587235C (de) * | 1932-03-31 | 1933-11-01 | Eugen Schwarz | Verfahren zur Beheizung des verlorenen Kopfes oder der Steiger von Bloecken und Formstuecken |
| FR739258A (fr) * | 1932-06-29 | 1933-01-09 | Coquille de coulée pour métaux | |
| JPS50108B1 (enrdf_load_stackoverflow) * | 1969-03-28 | 1975-01-06 | ||
| FR2071442A5 (en) * | 1969-12-30 | 1971-09-17 | Daussan Henri | Ingot casting mould partly exothermically - heated |
-
1978
- 1978-02-07 GB GB4957/78A patent/GB1595737A/en not_active Expired
-
1979
- 1979-01-25 JP JP50037179A patent/JPS55500084A/ja active Pending
- 1979-01-25 BR BR7906448A patent/BR7906448A/pt unknown
- 1979-01-25 DE DE792934887T patent/DE2934887T1/de active Granted
- 1979-01-25 WO PCT/EP1979/000003 patent/WO1979000596A1/de unknown
- 1979-08-28 EP EP79900170A patent/EP0009028A1/en not_active Withdrawn
- 1979-10-05 SE SE7908283A patent/SE431833B/sv not_active IP Right Cessation
-
1980
- 1980-04-24 FR FR8009293A patent/FR2448951A1/fr active Granted
Non-Patent Citations (1)
| Title |
|---|
| See references of WO7900596A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2448951A1 (fr) | 1980-09-12 |
| GB1595737A (en) | 1981-08-19 |
| JPS55500084A (enrdf_load_stackoverflow) | 1980-02-14 |
| SE431833B (sv) | 1984-03-05 |
| DE2934887C2 (enrdf_load_stackoverflow) | 1988-07-14 |
| DE2934887T1 (de) | 1981-01-15 |
| FR2448951B1 (enrdf_load_stackoverflow) | 1983-10-28 |
| SE7908283L (sv) | 1979-10-05 |
| BR7906448A (pt) | 1979-12-11 |
| WO1979000596A1 (fr) | 1979-08-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): FR |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 110E | Request filed for conversion into a national patent application [according to art. 135 epc] | ||
| 18D | Application deemed to be withdrawn |