CA1195473A - Lengthened discharge nozzle for tundishes - Google Patents
Lengthened discharge nozzle for tundishesInfo
- Publication number
- CA1195473A CA1195473A CA000416640A CA416640A CA1195473A CA 1195473 A CA1195473 A CA 1195473A CA 000416640 A CA000416640 A CA 000416640A CA 416640 A CA416640 A CA 416640A CA 1195473 A CA1195473 A CA 1195473A
- Authority
- CA
- Canada
- Prior art keywords
- piece
- intermediate container
- pouring nozzle
- container
- pouring
- 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
Links
Landscapes
- Continuous Casting (AREA)
Abstract
ABSTRACT
A pouring nozzle for an intermediate container of a strand casting device has a body part of a refractory material arranged in an opening of a bottom of the intermediate container, an elongated piece of refractory material associated with the body part and extending in the interior of the intermediate container, and a breakage point provided between the body part and the elongated piece at a height of the bottom of the intermediate container.
A pouring nozzle for an intermediate container of a strand casting device has a body part of a refractory material arranged in an opening of a bottom of the intermediate container, an elongated piece of refractory material associated with the body part and extending in the interior of the intermediate container, and a breakage point provided between the body part and the elongated piece at a height of the bottom of the intermediate container.
Description
~5~'~3 BACKGROUND OF THE INVENTION
The present invention relates to a pouring nozzle for a strand casting devic0 and to an in~ermediate container provided therewithO
Strand casting device are known in the art in which an intermediate container or a distribu~or has a pouring opening provided with a pouring sleeve of reEractory material.
In the known intermediate containers, which sometimes are controlled by a slider, in the event of the open slider there are always casting di~ficulties, inasmuch as during the beginning of casting the melt flowing from the ladle into the intermediate container has a tendency to freeze and block ~he same because o the initial high temperature losses and impurities located in the intermediate container from the heating period, These casting problems cannot be eliminated even in the event that the pouring sleeve extend somewhat over the bottom of the intermediate container or the outlet, for example during open castingt is closed by a lead pl~lg ~
SUMMARY OF THE INVENTION
I provide a pouring nozzle and an intermediate container therewith, which avoid the disadvantages oE the prior art.
More particularly, I provide a pouring nozzle and an intermediate container therewith which guarantee a disturbance-free casting in a casting device.
, ~
. ~ ,.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a pouring nozzle or an intermediate container, in which a pouring nozzle has a body part of refractory material and an elongated piece also of refractory material associated with the body part, and means forming a breakage point between the body part and the elongated piece is provlded at a height of a bottom of the intermediate container.
When the pouring device and the intermediate container are designed in accordance with one aspect oE the present inven~ion/
after reaching the desired bath level the body part is separated from the elongated piece and thereby the opening in the bottom of the intermediate container i5 released, so that the melt because of only small heat losses can be discharged unobjectionably and continuously, free from slag portions or other impurities. The separated elongated piece floats on the melt and cannot obstruct -the free running of the melt or affect its chemical composition.
In accordance with another advantageous feature of my pouring device, the body part and the elongated piece may be formed as a one-piece member provided with the breakage point. The thus elongated pouring nozzle can be broken by an iron rod or a coilecl hoard pipe of a sufficient length through a plug cover hole or through an opening in a latera] wall of the intermediate container by a slide pipe.
The breakage point in this one-piece member can be formed as a ring-shaped groove which reduces the thickness of a ~all of this one-piece member.
q~
In accordance with a Eurther advantageous feature of my pouring device the body part of the pouring nozzle and the elongated piece are formed as two members, and the breakage point is formed as a refractory binding medium between these two members.
The refractory binding the medium is selected so that its heat strength lies in the region o~ the liquefying temperature of a melt -to be cast. Upon reachiny the predetermined temperature, the elongated piece releases automatically from the body part of the pouring nozzle and rises in the melt.
The novel features which are considered characteristic for the invention are set forth in particular in the appended claims.
The invention itself~ however, both as to its construction and its method of operation, together with additional objects and advantages thereoE, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawing.
BRIEF DESCRIPTION OE THE DRAWING
Fig. 1 is a view showing a part of a strand testing device with an intermediate container and a pouring nozzle in accordance with the present invention;
Fig. 2 is a view showing a pouring nozzle of Fig. 1 on an enlarged scale; and Fig. 3 is a view substantially corresponding to the view of Fig. 2, but showing a further embodiment of the pouring nozzle in accordance with the present invention.
~
S~73 DESCRIPTION OF THE PREFERRED EMBODIMENTS
Fig. 1 shows a portion of a continuous casting device of conventional construction. A liquid raw steel 10 flows from a casting ladle 11 to an intermediate container or distributor 12.
From the intermediate container 12, the raw steel flows to a copper mold (ingot mold). More particularly, the raw steel Elows from the intermediate container 12 to the mold 16 ~hrough an outlet opening 13 which is closable by an elongated pouring sleeve 14, and through an opened slider or gate 15 formed, for example, as a three-plate regulating gate.
The copper mold 16 is arranged exactly vertically and opened at both its sides. During casting it is closed only at its opposite side. The melt cools in the mold 16 exactly for so long that is can form a bearing outer shell. The partially rigidified strand is removed from the form vertically, horizontally or in a curved path, in dependence upon the design of the casting device.
The elongated outlet sleeve 14 and also the distributor 12 are composed advantageously of strong alumina-containing refractory material. The pouring sleeve 14 is composed of a lower part 17 and an upper part or upper sleeve piece 18, as can be seen from Fig. 2.
They are advantageously Eormed of one piece with one another. The pouring sleeve 14, at the point of transition between the parts 17 and 18, is formed with a breaking point in form of a groove-shaped breakage ring 19. The length of the lower portion 17 of the pouring sleeve 14 substantially corresponds to the known pouring sleeves whose one end in mounted condition extends advantageously by substantially 20-30 mm outwardly above the bottom of the ;, ., intermediate container. The entire length of the pouring sleeve 14 which is lengthened in such a manner is adjusted advantageously in correspondence with the desired bath level height. In practice the length o~ the upper sleeve piece 18 is considered sufficient to be equal to appro~lmately 200 mm.
Fig. 3 shows a Çurther embodiment of lengthened pouring sleeve which is identified here with reference numeral 20. In contrast -to the above described one-piece sleeve 14, the pouring sleeve 20 is Eormed of two partsO A lower part 21 and an upper part or an upper sleeve piece 22 are connected with one another in butt relationship with the aid of a refractory binding medium 23. This binding medium 23 forms a breakage point between both part and has a heat stren~th lying in the region of the liquefaction temperature o~
the melt to be cast. As a result of this, the breakage point is dissolved only when the desired bath level height is reached in the intermediate container. A high heat strength of the introduced binding medium guarantees a longer dwell time of the melt prior to casting in the intermediate container, so -that undesirable metal impurities can bubble up in the slag ~one.
As material for the binding medium, hot glue or other suitable carbon-containing burning-out materials can be usecl, which upon attaining a predetermined temperature automatically release the upper sleeve piece 22. An equally good action can also be attained with the aid of materials which because of their thermal properties expand under Eire (burning-out) and thrust the upper sleeve piece~
~5~
The above mentioned invention is described exclusively in connection with a slider-controlled continuous casting device.
~owever, it is to be understood that its Eeatures can be applied without structural changes, and without affecting the operation, a]so to devices which operate in open condition.
The present invention can also be used in so-called multiple-strand devices in which double or triple ingot molds are assembled in one mold block. In such devices it is possible, without danger of casting disturbances) to oscillate the molds assembled in the respective liftiny tables prior to the start of casting together with one another and also to remove the strands from the respective block together, inasmuch as the molds in the inventive device are supplied approximately with synchronization in a matter of seconds with the same quantities of metal.
The inventive features can also be used in a device of joint hybrid cast system without diEficulties. Strand casting devices of conventional types can also use the inventive eatures regardless of the number of their strands or strand shapes within the frame of open or slider-regulated casting metho-~s It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of constructions differing from the types described above.
.~
While the invention has been illustrated and described as embodied in a pouring nozzle ~Eor a strand casting device, it is not intended to be limited to the details shown, since various modifications and struc~ural changes may be made without departing in any way from the spirit of the present invention.
Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that from the standpoint of prior art, fa:irly constitute essential characteristics of the generic or specific aspects of this invention.
The present invention relates to a pouring nozzle for a strand casting devic0 and to an in~ermediate container provided therewithO
Strand casting device are known in the art in which an intermediate container or a distribu~or has a pouring opening provided with a pouring sleeve of reEractory material.
In the known intermediate containers, which sometimes are controlled by a slider, in the event of the open slider there are always casting di~ficulties, inasmuch as during the beginning of casting the melt flowing from the ladle into the intermediate container has a tendency to freeze and block ~he same because o the initial high temperature losses and impurities located in the intermediate container from the heating period, These casting problems cannot be eliminated even in the event that the pouring sleeve extend somewhat over the bottom of the intermediate container or the outlet, for example during open castingt is closed by a lead pl~lg ~
SUMMARY OF THE INVENTION
I provide a pouring nozzle and an intermediate container therewith, which avoid the disadvantages oE the prior art.
More particularly, I provide a pouring nozzle and an intermediate container therewith which guarantee a disturbance-free casting in a casting device.
, ~
. ~ ,.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a pouring nozzle or an intermediate container, in which a pouring nozzle has a body part of refractory material and an elongated piece also of refractory material associated with the body part, and means forming a breakage point between the body part and the elongated piece is provlded at a height of a bottom of the intermediate container.
When the pouring device and the intermediate container are designed in accordance with one aspect oE the present inven~ion/
after reaching the desired bath level the body part is separated from the elongated piece and thereby the opening in the bottom of the intermediate container i5 released, so that the melt because of only small heat losses can be discharged unobjectionably and continuously, free from slag portions or other impurities. The separated elongated piece floats on the melt and cannot obstruct -the free running of the melt or affect its chemical composition.
In accordance with another advantageous feature of my pouring device, the body part and the elongated piece may be formed as a one-piece member provided with the breakage point. The thus elongated pouring nozzle can be broken by an iron rod or a coilecl hoard pipe of a sufficient length through a plug cover hole or through an opening in a latera] wall of the intermediate container by a slide pipe.
The breakage point in this one-piece member can be formed as a ring-shaped groove which reduces the thickness of a ~all of this one-piece member.
q~
In accordance with a Eurther advantageous feature of my pouring device the body part of the pouring nozzle and the elongated piece are formed as two members, and the breakage point is formed as a refractory binding medium between these two members.
The refractory binding the medium is selected so that its heat strength lies in the region o~ the liquefying temperature of a melt -to be cast. Upon reachiny the predetermined temperature, the elongated piece releases automatically from the body part of the pouring nozzle and rises in the melt.
The novel features which are considered characteristic for the invention are set forth in particular in the appended claims.
The invention itself~ however, both as to its construction and its method of operation, together with additional objects and advantages thereoE, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawing.
BRIEF DESCRIPTION OE THE DRAWING
Fig. 1 is a view showing a part of a strand testing device with an intermediate container and a pouring nozzle in accordance with the present invention;
Fig. 2 is a view showing a pouring nozzle of Fig. 1 on an enlarged scale; and Fig. 3 is a view substantially corresponding to the view of Fig. 2, but showing a further embodiment of the pouring nozzle in accordance with the present invention.
~
S~73 DESCRIPTION OF THE PREFERRED EMBODIMENTS
Fig. 1 shows a portion of a continuous casting device of conventional construction. A liquid raw steel 10 flows from a casting ladle 11 to an intermediate container or distributor 12.
From the intermediate container 12, the raw steel flows to a copper mold (ingot mold). More particularly, the raw steel Elows from the intermediate container 12 to the mold 16 ~hrough an outlet opening 13 which is closable by an elongated pouring sleeve 14, and through an opened slider or gate 15 formed, for example, as a three-plate regulating gate.
The copper mold 16 is arranged exactly vertically and opened at both its sides. During casting it is closed only at its opposite side. The melt cools in the mold 16 exactly for so long that is can form a bearing outer shell. The partially rigidified strand is removed from the form vertically, horizontally or in a curved path, in dependence upon the design of the casting device.
The elongated outlet sleeve 14 and also the distributor 12 are composed advantageously of strong alumina-containing refractory material. The pouring sleeve 14 is composed of a lower part 17 and an upper part or upper sleeve piece 18, as can be seen from Fig. 2.
They are advantageously Eormed of one piece with one another. The pouring sleeve 14, at the point of transition between the parts 17 and 18, is formed with a breaking point in form of a groove-shaped breakage ring 19. The length of the lower portion 17 of the pouring sleeve 14 substantially corresponds to the known pouring sleeves whose one end in mounted condition extends advantageously by substantially 20-30 mm outwardly above the bottom of the ;, ., intermediate container. The entire length of the pouring sleeve 14 which is lengthened in such a manner is adjusted advantageously in correspondence with the desired bath level height. In practice the length o~ the upper sleeve piece 18 is considered sufficient to be equal to appro~lmately 200 mm.
Fig. 3 shows a Çurther embodiment of lengthened pouring sleeve which is identified here with reference numeral 20. In contrast -to the above described one-piece sleeve 14, the pouring sleeve 20 is Eormed of two partsO A lower part 21 and an upper part or an upper sleeve piece 22 are connected with one another in butt relationship with the aid of a refractory binding medium 23. This binding medium 23 forms a breakage point between both part and has a heat stren~th lying in the region of the liquefaction temperature o~
the melt to be cast. As a result of this, the breakage point is dissolved only when the desired bath level height is reached in the intermediate container. A high heat strength of the introduced binding medium guarantees a longer dwell time of the melt prior to casting in the intermediate container, so -that undesirable metal impurities can bubble up in the slag ~one.
As material for the binding medium, hot glue or other suitable carbon-containing burning-out materials can be usecl, which upon attaining a predetermined temperature automatically release the upper sleeve piece 22. An equally good action can also be attained with the aid of materials which because of their thermal properties expand under Eire (burning-out) and thrust the upper sleeve piece~
~5~
The above mentioned invention is described exclusively in connection with a slider-controlled continuous casting device.
~owever, it is to be understood that its Eeatures can be applied without structural changes, and without affecting the operation, a]so to devices which operate in open condition.
The present invention can also be used in so-called multiple-strand devices in which double or triple ingot molds are assembled in one mold block. In such devices it is possible, without danger of casting disturbances) to oscillate the molds assembled in the respective liftiny tables prior to the start of casting together with one another and also to remove the strands from the respective block together, inasmuch as the molds in the inventive device are supplied approximately with synchronization in a matter of seconds with the same quantities of metal.
The inventive features can also be used in a device of joint hybrid cast system without diEficulties. Strand casting devices of conventional types can also use the inventive eatures regardless of the number of their strands or strand shapes within the frame of open or slider-regulated casting metho-~s It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of constructions differing from the types described above.
.~
While the invention has been illustrated and described as embodied in a pouring nozzle ~Eor a strand casting device, it is not intended to be limited to the details shown, since various modifications and struc~ural changes may be made without departing in any way from the spirit of the present invention.
Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that from the standpoint of prior art, fa:irly constitute essential characteristics of the generic or specific aspects of this invention.
Claims (6)
1. An intermediate container of a strand casting device comprising;
a container part having a bottom with an opening, a pouring nozzle of a refractory material, arranged at said opening of said bottom of said container part, an elongating piece of a refractory material, associated with said pouring nozzle and extending into the interior of said container part; and means forming a breakage point between said pouring nozzle and said elongating piece at a height of said bottom of said container part, said nozzle, said piece and said means together forming an uninterrupted integral element.
a container part having a bottom with an opening, a pouring nozzle of a refractory material, arranged at said opening of said bottom of said container part, an elongating piece of a refractory material, associated with said pouring nozzle and extending into the interior of said container part; and means forming a breakage point between said pouring nozzle and said elongating piece at a height of said bottom of said container part, said nozzle, said piece and said means together forming an uninterrupted integral element.
2. An intermediate container as defined in claim 1, wherein said pouring nozzle and said elongated piece are formed as a one-piece member having a wall.
3. An intermediate container as defined in claim 2, wherein said wall of said one-piece member has a predetermined thickness, said breakage point forming means including a groove which reduces the thickness of said wall of said one-piece member.
4. An intermediate container as defined in claim 3, wherein said groove in said all of said one-piece member is ring-shaped.
5. An intermediate container as defined in claim 1, wherein said pouring nozzle and said elongating piece are formed as separate members, said breakage piece forming means including a refractory binding medium integrally connecting said separate members with one another.
6. An intermediate container as defined in claim 5, wherein said binding medium has a thermal strength lying in the region of a liquefying temperature of a melt to be cast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000416640A CA1195473A (en) | 1982-11-30 | 1982-11-30 | Lengthened discharge nozzle for tundishes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000416640A CA1195473A (en) | 1982-11-30 | 1982-11-30 | Lengthened discharge nozzle for tundishes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1195473A true CA1195473A (en) | 1985-10-22 |
Family
ID=4124045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000416640A Expired CA1195473A (en) | 1982-11-30 | 1982-11-30 | Lengthened discharge nozzle for tundishes |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1195473A (en) |
-
1982
- 1982-11-30 CA CA000416640A patent/CA1195473A/en not_active Expired
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