JPH11138241A - Method for setting iron shell of continuous casting nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniforming the joint thickness and to enable the automation of operation without brining about the breakage of the nozzle body by fitting an iron shell interposing an interval holding means at the outer periphery of the nozzle vertically stood and pouring and solidifying castable refractory and/or mortar from the upper end part after closing the lower end part in a gap between the nozzle and the iron shell with a sealing means. SOLUTION: In the case of the nozzle for slide gate, after standing the nozzle body 5 into the recessed part 1a of a lower mold 1 so that the iron shell set part becomes downward, hot-melting material 3 is filled up into an iron shell laying step part 1b. The interval holding means of the iron shell 5 is desirable to be plural leaf-springs or the other elastic bodies fitted on the inner surface. After pouring the castable refractory 7 into the constant gap between the iron shell 5 and the nozzle body 2 through a funnel type pouring jig 6, immediately the pouring jig 6 and the lower mold 1 are removed, and the nozzle body 2, etc., are shifted and dried to a necessary position to solidify the castable refractory 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting an iron skin of a continuous casting nozzle such as a lower nozzle for a slide gate, a long nozzle, and a dipping nozzle.

[0002]

2. Description of the Related Art Normally, a continuous casting nozzle has a steel shell attached to a fitting portion of a nozzle body with a holder for reinforcement. Conventionally, as a method for setting a steel shell of a continuous casting nozzle, as shown in FIGS. 16 and 17, which exemplify a long nozzle or a submerged nozzle, a high viscosity is provided on the outer periphery of a steel shell mounting portion in a vertically erected nozzle body 31. After the mortar 32 is applied, an iron shell 33 is fitted around the outer periphery of the mortar 32 to remove the protruding mortar 32, and then dried to solidify the mortar 32. When the steel cannot be fitted from one end of the nozzle body due to the dimensions, as shown in FIGS. 18 and 19, a high-viscosity mortar is provided on the outer periphery of the steel-shell mounting portion of the vertically standing nozzle body 34. 35
After coating, the iron sheath 36 composed of the segment 36a divided in advance is joined together by sandwiching the nozzle body 34 from the outer periphery of the mortar 35 and joined by welding, the extruded mortar 35 is removed, and then dried. Thus, the mortar 35 is solidified. Further, as shown in FIGS. 20 to 24 exemplifying the lower nozzle for the slide gate, the lower die 3 for positioning the nozzle body 37 and the steel 38 in the longitudinal direction.
9, the nozzle body 37 is erected vertically, and an iron shell 38 is concentrically fitted around the nozzle body 37 and placed.
A funnel-shaped casting jig 40 is attached to the upper end of the steel 38, and a flowable castable refractory (self-flow castable) 41 is poured into a gap between the nozzle body 37 and the steel 38, and the castable is left naturally. After the refractory 41 has solidified, the casting jig 40 and the lower mold 39 are removed.

[0003]

However, when using a high-viscosity mortar in the conventional method of setting the iron shell of a continuous casting nozzle, the viscosity control of the mortar not only during preparation but also after application is troublesome, and centering is not achieved. It is difficult, and there is a portion where the joint thickness is partially different, so that the nozzle body may be cracked at the time of use, which may cause breakage trouble. In particular, for the iron skin consisting of two segments, after setting the segments by pressing the mortar, and then joining the divided parts by welding, it is attached in a state where tensile stress is applied to the iron skin, so when using it Distortion occurs in the steel skin, and the effect on the nozzle body becomes large. On the other hand, when using a castable refractory having fluidity, when the castable refractory is poured, the steel shell is easily moved and it is difficult to center, and a portion having a different joint thickness occurs partially, so a mortar having a high viscosity is used. As in the case, the nozzle body may be cracked at the time of use, which may cause a breakage trouble. In addition, the castable refractory that has flowed into the gap between the steel shell and the nozzle body sometimes flows between the lower mold and the nozzle body (see FIG. 23).
This causes the lower mold to become dirty. Further, the lower mold cannot be removed and the nozzle body cannot be moved until the castable refractory solidifies, which makes it difficult to promote automation. Accordingly, an object of the present invention is to provide a method for setting a skin of a continuous casting nozzle that can achieve a uniform joint thickness and that does not cause breakage of the nozzle body. Another purpose is
Another object of the present invention is to provide a method of setting a steel shell of a continuous casting nozzle that can be automated in addition to the above objects.

[0004]

According to a first aspect of the present invention, there is provided a method for setting a steel shell of a continuous casting nozzle, wherein the steel shell is maintained at an interval around a required portion of a vertically erected nozzle body. It is characterized in that the castable refractory and / or mortar is poured into the gap between the steel shell and the nozzle body from the upper end of the gap and solidified. It is preferable that the spacing means is a plurality of springs or other elastic bodies attached to the inner surface of the steel shell. The spacing means may be a plurality of paper pieces or tape pieces attached to the inner surface of the steel shell. The spacing means may be a plurality of protrusions formed by projecting a steel shell inward. Further, the interval maintaining means may be a plurality of cut and bent pieces obtained by cutting and bending (cutting and raising) the steel skin inward. on the other hand,
In a second method of setting a steel shell of a continuous casting nozzle, in the first method, prior to the casting of the castable refractory and / or mortar, a lower end of a gap between the steel shell and the nozzle body is closed by a sealing means. It is characterized by doing. Preferably, the sealing means is a hot melt material. The sealing means may be a rubber packing. The sealing means may be a quick-drying mortar. The sealing means may be a water-absorbing polymer. Further, the sealing means may be a ridge formed by beading the lower end of the steel shell inward along the circumferential direction.

The gap between the steel shell and the nozzle body is made constant by fitting the steel shell to the outer periphery of the nozzle body with the spacing means interposed therebetween. The positioning of the steel shell in the longitudinal direction with respect to the nozzle main body and the closing of the lower end of the gap between the steel shell and the nozzle main body are performed by a lower mold as in the related art. By using an elastic body for the interval maintaining means, it is possible to temporarily fix the iron skin to the nozzle body. Further, when the interval maintaining means is cut and bent, it is necessary to apply taping to the outer periphery of the steel shell in order to prevent leakage of castable refractories and the like. on the other hand,
By closing the lower end of the gap between the steel shell and the nozzle body by the sealing means, leakage of the castable refractory or the like from between the nozzle body and the lower mold is prevented, and the nozzle body or the like is removed from the lower mold. Molding becomes possible immediately after casting of castable refractories. By using a hot melt material for the sealing means, the lower end between the steel shell and the nozzle body can be closed in a short time (about 30 seconds). Further, by using a hot melt material or a quick-drying mortar as the sealing means, the steel shell and the nozzle body are fixed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1, 2, 3 and 4
Is the first method of setting the iron shell of the continuous casting nozzle according to the present invention.
It is a longitudinal cross-sectional view which shows each process of the form of Example. This method is for a lower nozzle for a slide gate. First, as shown in FIG. 1, a nozzle body 2 is placed in a nozzle body accommodating recess 1a of a lower die 1 so that an iron skin set portion thereof faces downward. After standing, the hot-melt material 3 serving as a sealing means is filled into the steel placing step 1b formed on the peripheral edge of the nozzle body accommodating recess 1a in the lower die 1. Next, FIG.
As shown in FIG. 1, an iron shell 5 having a plurality of leaf springs 4 serving as spacing means on its inner surface is fitted on the outer periphery of the nozzle body 2 and the lower end thereof is set on an iron skin mounting step 1b of the lower mold 1. Abut. As shown in FIG. 5, FIG. 6, and FIG. 7, the iron skin 5 is provided with four leaf springs 4 which are bent substantially in the shape of a letter on the upper and lower inner surfaces in the circumferential direction, and has an open end. 4a is located rearward in the fitting direction of the steel shell 5 (from above to below in FIG. 2), and the fixed end 4b is attached in two upper and lower stages by spot welding. In addition, the fitting of the iron shell 5 is performed before the hot melt material 3 is solidified. The leaf spring 4 is
The present invention is not limited to the case of mounting in two upper and lower stages, but may be of one stage, and is not limited to four, and may be three or more equally arranged in the circumferential direction. The fitting of the iron skin 5 causes the open ends 4 of the leaf springs 4 to be closed.
a is pressed against the outer peripheral surface of the nozzle body 2 by the reaction force, and the iron shell 5 is temporarily fixed, and the iron shell 5 is automatically centered, so that the gap between the iron shell 5 and the nozzle body 2 is constant. Becomes
The lower end of the gap between the iron shell 5 and the nozzle body 2 is closed by the hot melt material 3, and both are fixed by the hot melt material 3.

Next, as shown in FIG. 3, a funnel-shaped casting jig 6 is attached to the upper end of the steel shell 5, and a flowable castable refractory 7 is placed in a gap between the steel shell 5 and the nozzle body 2. After the casting, as shown in FIG. 4, the casting jig 6 and the lower mold 1 are immediately removed, and the nozzle body 2 and the like are moved to a required place and dried to solidify the castable refractory 7. When the castable refractory 7 is poured, the lower end of the gap between the steel shell 5 and the nozzle body 2 is closed by the hot melt material 3, so that the castable refractory 7 is cast.
Does not leak between the nozzle body 2 and the lower mold 1, and the casting jig 6 and the lower mold 1 can be removed immediately after the pouring is completed. Therefore, according to the method of the first embodiment, the gap between the iron shell 5 and the nozzle main body 2 is constant, so that the joint thickness can be made uniform, and the nozzle main body 2 may be broken. I will not do it.
Further, since the castable refractory 7 is prevented from leaking between the nozzle body 2 and the lower mold 1, the lower mold 1 is not soiled, and the nozzle body 2 and the like are removed from the lower mold 1 and moved. It becomes possible immediately after the casting of the castable refractories is completed, and automation can be performed.

Here, a steel bar having a leaf spring having a reaction force of 5 to 50 kg / piece is used, and the chemical components are SiO ₂ (α-quartz silica sand) 70.5 wt% and Al ₂ O ₃ 24.3 wt%. ,
5.2% by weight of CaO, added moisture: 15 to 17% by weight (external ratio), characteristics after drying at 110 ° C: dimensional change rate -0.15
%, A specific gravity of 2.23, and a compressive strength of 62 MPa, the self-casting of the lower nozzle for the slide gate was carried out using a self-flow castable, and the time required for each step before shifting to the drying step was obtained. Is as shown in Table 1 together with that of the conventional method, and it can be seen that it can be dramatically reduced.

[0009]

[Table 1]

FIG. 8, FIG. 9, FIG. 10 and FIG. 11 are side views showing the steps of a second embodiment of the method for setting the iron shell of the continuous casting nozzle according to the present invention. This method is for a long nozzle or a submerged nozzle. First, as shown in FIG. 8, the nozzle body 8 is erected so that the iron skin set portion thereof is located upward, and then the nozzle body 8 absorbs water. In the case of a material which is easy to be coated, a waterproof agent 9 is coated on the outer periphery of the steel set portion. Next, as shown in FIG. 9, similarly to the iron shell 5 used in the method of the first embodiment, an iron shell 11 having a plurality of leaf springs 10 which are spacing means is attached to the inner surface of the nozzle body 8. And the lower end of the gap between the steel shell 11 and the nozzle body 8 is filled with a hot melt material 12 as sealing means. By fitting of the above-mentioned iron skin 11,
Similarly to the method of the first embodiment, the iron shell 11 is temporarily fixed to the nozzle main body 8 and the centering thereof is automatically performed, so that the gap between the iron shell 11 and the nozzle main body 8 becomes constant. .
In addition, the filling of the hot melt material 12 closes the lower end of the gap between the steel shell 11 and the nozzle body 8, and the two are fixed. For this reason, a lower mold for positioning the iron shell 11 with respect to the nozzle body 8 is not required. Next, as shown in FIG. 10, a double funnel-shaped casting jig 13 is attached to the upper end of the steel shell 11, and a flowable castable refractory 14 is poured into a gap between the steel shell 11 and the nozzle body 8. Thereafter, as shown in FIG. 11, the casting jig 13 is removed, and the nozzle body 8 and the like are moved to a required place and dried to solidify the castable refractory 14. The castable refractory 14
At the time of pouring, as in the method of the first embodiment,
The iron shell 11 and the lower end of the nozzle body 8 are made of a hot melt material 12.
As a result, the castable refractory 14 does not leak downward. Therefore, the second
According to the method of the second embodiment, similarly to the method of the first embodiment, the gap between the steel shell 11 and the nozzle body 8 is constant, so that the joint thickness can be made uniform. , Iron skin 1
Even in the case where 1 is divided into two, no distortion is caused at the time of joining the segments, and the breakage of the nozzle body 8 is not caused. In addition, since there is no leakage below the castable refractory 14 and the movement of the nozzle body 8 and the like can be performed immediately after the casting of the castable refractory 14, automation can be performed.

In the method of each of the above-described embodiments, the case where the spacing means is the leaf springs 4 and 10 attached to the inner surfaces of the iron shells 5 and 11 has been described. However, the present invention is not limited to this. Instead, an elastic body such as a coil spring, a disc spring, or a synthetic rubber attached to the inner surfaces of the steel shells 5 and 11 may be used as the spacing means, or as shown in FIG. 12, FIG. 13 and FIG. A piece of paper or tape 16 attached to the inner surface, a protruding portion 17a formed by projecting a required portion of the steel shell 17 inward, and a cut and bent piece 1 formed by cutting and bending (cut-and-raising) a required portion of the steel shell 18 inward.
8a may be used as the spacing means. The sealing means is not limited to the hot melt materials 3 and 12, but may be rubber packing, quick-drying mortar, water-absorbing polymer, or adhesive tape. Alternatively, as shown in FIG. The protrusion 19a formed by beading the lower end portion of the lower end portion inward along the circumferential direction may be used as the sealing means. In FIG. 14, reference numeral 20 denotes a leaf spring serving as a spacing means. Further, the sealing means may not be provided when the flowability of the castable refractory is low. In this case, a lower mold for closing the lower end of the gap between the steel shell and the nozzle body and positioning the steel shell in the longitudinal direction is required.
Furthermore, what is poured into the gap between the iron shell and the nozzle body is not limited to the castable refractory, but may be a fluid mortar or a combination (laminated) of the mortar and the castable refractory.

[0012]

As described above, according to the first method of setting the iron shell of the continuous casting nozzle of the present invention, the gap between the iron shell and the nozzle body is constant, so that the joint thickness is made uniform. Therefore, no breakage of the nozzle body is caused. Further, according to the second method of setting the iron shell of the continuous casting nozzle, in addition to the function and effect of the first method, leakage of the castable refractory and / or the mortar from the lower end of the gap is prevented. Can be performed immediately after the casting of the castable refractory or the like is completed, and automation can be performed.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing a first step of a first embodiment of a method for setting an iron skin of a continuous casting nozzle (lower nozzle for a slide gate) according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a second step of the first embodiment of the method for setting the iron shell of the continuous casting nozzle according to the present invention.

FIG. 3 is a vertical sectional view showing a third step of the first embodiment of the method for setting the iron shell of the continuous casting nozzle according to the present invention.

FIG. 4 is a vertical cross-sectional view (finished product view) showing a fourth step of the first embodiment of the method for setting the iron skin of the continuous casting nozzle according to the present invention.

FIG. 5 is a longitudinal sectional view of a steel shell used in a first embodiment of a method for setting a steel shell of a continuous casting nozzle according to the present invention.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;

FIG. 7 is a perspective view of a leaf spring attached to the iron skin of FIG. 5;

FIG. 8 is a side view showing a first step of a second embodiment of the method of setting the iron shell of the continuous casting nozzle according to the present invention.

FIG. 9 is a partial cross-sectional side view showing a second step of the second embodiment of the method for setting the steel shell of the continuous casting nozzle according to the present invention.

FIG. 10 is a partial cross-sectional side view showing a third step of the second embodiment of the method for setting the iron skin of the continuous casting nozzle according to the present invention.

FIG. 11 is a side view, partly in section, showing a fourth step of the second embodiment of the method for setting the iron shell of the continuous casting nozzle according to the present invention.

FIG. 12 is a half cross-sectional side view in which a steel strip spacing means used in the method for setting the steel shell of the continuous casting nozzle according to the present invention is a piece of paper or a piece of tape.

FIG. 13 is a half cross-sectional side view in which the interval between the iron shells used in the method of setting the iron shell of the continuous casting nozzle according to the present invention is a projection.

FIG. 14 is a half cross-sectional side view in which the interval maintaining means of the iron shell used in the method of setting the iron shell of the continuous casting nozzle according to the present invention is a cut and bent piece.

FIG. 15 is a half sectional side view of an iron shell provided with a sealing means used in the method of setting the iron shell of the continuous casting nozzle according to the present invention.

FIG. 16 is a side view showing a first step of the conventional method.

FIG. 17 is a partial cross-sectional side view showing a second step of the conventional method.

FIG. 18 is a side view showing a first step of another conventional method.

FIG. 19 is a side view showing a second step of another conventional method.

FIG. 20 is a longitudinal sectional view showing a first step of still another conventional method.

FIG. 21 is a longitudinal sectional view showing a second step of still another conventional method.

FIG. 22 is a longitudinal sectional view showing a third step of still another conventional method.

FIG. 23 is a longitudinal sectional view showing a fourth step of still another conventional method.

FIG. 24 is a longitudinal sectional view showing a fifth step of still another conventional method.

[Explanation of symbols]

 2 Nozzle body 3 Hot melt material (sealing means) 4 Leaf spring (space maintaining means) 5 Iron shell 7 Castable refractory 8 Nozzle body 10 Leaf spring (space maintaining means) 11 Iron shell 12 Hot melt material (sealing means) 14 Castable Refractory 15 Iron shell 16 Paper or tape piece (interval holding means) 17 Iron shell 17a Projection (interval holding means) 18 Iron shell 18a Cut and bent piece (interval holding means) 19 Iron shell 19a Ridge (sealing means) 20 Leaf spring (space maintaining means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Chitoshi Oya 1st Minamito, Ogakie-cho, Kariya-shi, Aichi Pref. Toshiba Ceramix Co., Ltd. Ceramics Corporation Kariya Works

Claims (11)

[Claims] 1. A steel shell is fitted around an outer periphery of a required portion of a vertically erected nozzle body with a spacing means interposed therebetween, and a castable refractory and / or mortar is inserted into a gap between the steel shell and the nozzle body. A method for setting a steel shell of a continuous casting nozzle, wherein the steel is poured from an upper end of a gap and solidified. 2. The method according to claim 1, wherein said spacing means comprises a plurality of springs or other elastic bodies attached to the inner surface of the steel shell. 3. The method according to claim 1, wherein said spacing means is a plurality of paper pieces or tape pieces attached to the inner surface of the steel shell. 4. The method according to claim 1, wherein the spacing means comprises a plurality of protrusions formed by projecting an inwardly extending steel shell. 5. The method according to claim 1, wherein said spacing means comprises a plurality of cut and bent pieces formed by cutting and bending inward the steel. 6. The method according to claim 1, wherein the lower end of the gap between the steel shell and the nozzle body is closed by a sealing means prior to the casting of the castable refractory and / or mortar. 6. The method for setting a steel shell of a continuous casting nozzle according to 4 or 5. 7. The method according to claim 6, wherein the sealing means is a hot melt material. 8. The method according to claim 6, wherein the sealing means is a rubber packing. 9. The method according to claim 6, wherein said sealing means is a quick-drying mortar. 10. The method according to claim 6, wherein the sealing means is a water-absorbing polymer. 11. The steel shell set of the continuous casting nozzle according to claim 6, wherein said sealing means is a ridge portion formed by inwardly forming a lower end portion of the steel shell along a circumferential direction. Method.