GB2059558A - Avoiding blocking of metal pouring vessels - Google Patents
Avoiding blocking of metal pouring vessels Download PDFInfo
- Publication number
- GB2059558A GB2059558A GB7933612A GB7933612A GB2059558A GB 2059558 A GB2059558 A GB 2059558A GB 7933612 A GB7933612 A GB 7933612A GB 7933612 A GB7933612 A GB 7933612A GB 2059558 A GB2059558 A GB 2059558A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gas
- outlet
- refractory
- yielding
- molten metal
- 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.)
- Granted
Links
- 239000002184 metal Substances 0.000 title claims abstract description 32
- 230000000903 blocking effect Effects 0.000 title claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 17
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000005587 bubbling Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 19
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
This invention relates to a new method for avoiding blocking of the outlet 5 of a metal pouring vessel 1 when such outlet is temporarily closed by means of a refractory gate 6, by providing said refractory gate on at least a part 9 of its closing surface with a material 8 yielding a substantial gas release when coming into contact with, or close to the hot molten metal in the outlet of the pouring vessel. <IMAGE>
Description
SPECIFICATION
Method for avoiding blocking of temporarily closed metal pouring vessels, and equipment suitable therefor
This invention relates to a new method for avoiding blocking of the outlet of a metal pouring vessel when such outlet is temporarily closed by means of a refractory gate, as well as to suitable equipment for such method.
More in particular the invention concerns an improved method in which the liquid metal staying in the outlet of the vessel, when such outlet is closed by the relatively much colder refractory plate, is kept in motion, so as to avoid the formation of a crust of solidified metal due to cooling of the molten metal.
There is presently known such a method for keeping the molten metal in constant motion in which an inert gas is blown into the molten metal staying in the vessel outlet, through a porous insert in the refractory gate. Such technique has however considerable drawbacks in that it requires the provision of gas conducts through and connections of gas conducts to said gate.
Handling of such equipment has shown very cumbersome and has therefore not proven quite satisfactcry.
In accordance with this invention, there has now been developed a new method for avoiding blocking ofthe outlet of a metal pouring vessel, which method avoids the drawbacks of the known systems.
According to this new method, blocking of the outlet of the pouring vessel, when temporarily closed by means of a refractory gate, is avoided by providing said refractory gate, on at least a part of its closing surface with a material yielding a substantial gas release when coming into contact with, or close to the hot molten metal in the outlet of the pouring vessel.
In a preferred embodimsnt of the invention, said gas yielding material may, in particular be provided in the form of an insert part fitting in a corresponding cavity in the refractory gate.
According to a further feature of the invention such gas yielding material may suitably be made up of or comprise a component which decomposes thermically with formation of at least one gas.
According to a still further feature such thermically decomposing component may very appropriately decompose through an exothermic reaction.
In such case, the solidification of the molten metal staying in the closed outlet will not only be achieved keeping said molten metal in motion, but the heath released by said exothermic reaction will also contrlbute to avoid formation of a crust of solidified metal.
In an other or further embodiment of the invention the gas yielding material may also be impregnated with a gas or with a gas yielding component.
According to a very appropriate embodiment of the invention, the gas yielding material may in
particular consist of a material traded under the
name "PTFE". (polytetrafluoroethylene).
It is clear of course that the gases released bv
the gas releasing material, should in accordance
with the invention, most conveniently be
substantially inert with respect to the molten
metal, in order to avoid introducing undesirable
impurities in the (molten) metal.
The invention on the other hand, also provides for suitable equipment for avoiding the blocking of
closed outlet of a metal pouring vessel.
In accordance with the invention, there is thus
provided a new type of refractory plate for a gate device on a metal pouring vessel, able to create
gas bubbling in the molten metal at the outlet of said vessel. When it is used for temporarily closing said outlet, which refractory plate has at least a part of its closing surface made up of a material yielding a substantial gas release when coming into contact with or close to hot molten metal.
In a preferred embodiment of such refractory plate according to the invention, it comprises an insert plug of gas yielding material, which is provided in a corresponding cavity in its closing surface.
According to a preferred feature of the invention, such insert plug may suitably be made of a material with a component which decomposes thermically with formation of at least one gas.
According to an other or further feature of the invention, said insert plug may in particular consist of the material called "PTFE".
The invention will further be explained hereafter through the description of a specific embodiment of the invention, given by way of puriVy illustrative example. In this description referencelis made to the attached drawing, which represents: - a section view of the outlet of a metal pour vessel, provided with a closing gate in accordance with the invention.
The figure shows the outlet part of a metal pouring vessel, generally designated by the reference numeral 1, with its refractory outlet parts 2, its shell 3 and its refractory outlet plate 4 (so called upper plate), having a pouring aperture 5.
The figure further shows a slide gate in accordance with the invention, consisting of a refractory plate 6 (so called lower plate), which is movably provided in front of the outlet so as to allow pouring of molten metal, by bringing an aperture 7 of the plate 6, in front of the aperture 5 of the upper plate 4.
When closing the outlet by bringing the plate 6 in the position represented in the figure, an insert plug 8, consisting of "PTFE" material, provided in a corresponding cavity 9 of the refractory material of said plate 6, comes in contact with the hot molten metal.
As a consequence, the "PTFE" material will start releasing gas, which will bubble up in the molten metal staying in the outlet, thus keeping said metal in motion to avoid blocking of the outlet.
The gas release should of course continue as long as the closure of the outlet is required. The total gas yielding capacity of the insert plug must therefore be foreseen at least sufficient to last the longest probably closing time of the outlet, in normal use.
The insert plug may in such case be so provided that it is easily replaceable, being intended to be used once only.
It should be emphasized that the invention is by no means limited to the above description of specific embodiments thereof and that numerous developments of said invention will be apparent to the skilled art worker, withbut leaving the general outline of the following claims.
Claims (11)
1. Method for avoiding blocking of the outlet of a metal pouring vessel, when temporarily closing such outlet by means of a refractory gate, characterized in that the refractory gate is provided on at least a part of its closing surface with a material yielding a substantial gas release when coming into contact with, or close to the hot molten metal in the outlet of the pouring vessel.
2. Method according to claim 1, characterized in that said gas yielding material is provided in the form of an insert part fitting in a corresponding cavity in the refractory gate.
3. Method according to claims 1 or 2, characterized in that said material comprises a component which decomposes thermically with formation of at least one gas.
4. Method according to claim 3, characterized in that said thermically decomposing component, decomposes in an exothermic reaction.
5. Method according to claims 1 or 2, characterized in that said material is impregnated with a gas or with a gas yielding component.
6. Method according to claims 1 or 2, characterized in that said material consists of so called "P.T.F.E.".
7. Method according to any one of claims 1 to 5, characterized in that said gas is substantially inert with respect to the molten metal.
8. Refractory plate for a gate device on a metal pouring vessel, able to create gas bubbling in the molten metal at the outlet of said vessel, when it is used for temporarily closing said outlet, characterized in that at least a part of its closing surface consists of a material yielding a substantial gas release when coming into contact with or close to hot molten metal.
9. Refractory plate according to claim 8, characterized in that it comprises an insert plug of such gas yielding material, provided in a corresponding cavity in its closing surface.
10. Refractory plate according to claim 9, characterized in that said insert plug is made of a material with a component which decomposes thermically with formation of at least one gas.
11. Refractory plate according to claim 9, characterized in that said insert plug is made of so-called "P.T.F.E."
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7933612A GB2059558B (en) | 1979-09-27 | 1979-09-27 | Avoiding blocking of metal pouring vessels |
| DE19803033055 DE3033055A1 (en) | 1979-09-27 | 1980-09-03 | METHOD FOR PREVENTING THE PLUG OUT OF A METAL CASTING VESSEL |
| BE0/202004A BE885109A (en) | 1979-09-27 | 1980-09-05 | METHOD AND DEVICE FOR AVOIDING THE BLOCKING OF THE OUTPUT PORT OF A MOLTEN METAL CASING ENCLOSURE |
| FR8019361A FR2466295A1 (en) | 1979-09-27 | 1980-09-08 | METHOD AND DEVICE FOR PREVENTING BLOCKING OF THE OUTPUT PORT OF A MELT METAL CASTING CHAMBER |
| JP13509380A JPS5656773A (en) | 1979-09-27 | 1980-09-26 | Method and device for preventing blocking by temporary closing of outlet of metal casting vessel |
| IT68489/80A IT1129180B (en) | 1979-09-27 | 1980-09-26 | PROCEDURE TO AVOID OBTURATION OF METAL CASTING CONTAINERS DURING THEIR TEMPORARY CLOSURE AND EQUIPMENT FOR ITS IMPLEMENTATION |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7933612A GB2059558B (en) | 1979-09-27 | 1979-09-27 | Avoiding blocking of metal pouring vessels |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2059558A true GB2059558A (en) | 1981-04-23 |
| GB2059558B GB2059558B (en) | 1983-02-16 |
Family
ID=10508122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7933612A Expired GB2059558B (en) | 1979-09-27 | 1979-09-27 | Avoiding blocking of metal pouring vessels |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5656773A (en) |
| BE (1) | BE885109A (en) |
| DE (1) | DE3033055A1 (en) |
| FR (1) | FR2466295A1 (en) |
| GB (1) | GB2059558B (en) |
| IT (1) | IT1129180B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5926980A (en) * | 1982-08-03 | 1984-02-13 | 黒崎窯業株式会社 | Sliding nozzle filler |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3684267A (en) * | 1970-01-12 | 1972-08-15 | United States Steel Corp | Apparatus for introducing gas to hot metal in a bottom-pour vessel |
| JPS5083235A (en) * | 1973-10-12 | 1975-07-05 |
-
1979
- 1979-09-27 GB GB7933612A patent/GB2059558B/en not_active Expired
-
1980
- 1980-09-03 DE DE19803033055 patent/DE3033055A1/en not_active Withdrawn
- 1980-09-05 BE BE0/202004A patent/BE885109A/en unknown
- 1980-09-08 FR FR8019361A patent/FR2466295A1/en not_active Withdrawn
- 1980-09-26 JP JP13509380A patent/JPS5656773A/en active Pending
- 1980-09-26 IT IT68489/80A patent/IT1129180B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT1129180B (en) | 1986-06-04 |
| DE3033055A1 (en) | 1981-04-16 |
| BE885109A (en) | 1981-03-05 |
| GB2059558B (en) | 1983-02-16 |
| JPS5656773A (en) | 1981-05-18 |
| FR2466295A1 (en) | 1981-04-10 |
| IT8068489A0 (en) | 1980-09-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |