JP7332314B2 - Sliding nozzle plate and method of reusing the metal strip of the sliding nozzle plate - Google Patents

Description

The present invention relates to a sliding nozzle plate used in a sliding nozzle device for controlling the flow rate of molten metal discharged from a molten metal container, and a method for reusing the metal band of the sliding nozzle plate.

The sliding nozzle device is a device for controlling the flow rate of molten metal, which has multiple sliding nozzle plates with through holes as the central component. The flow rate of the molten metal is controlled by sliding the independent sliding nozzle plates relative to each other to change the area of the opening formed by overlapping the inner holes of these sliding nozzle plates.

The vicinity of the inner hole of the sliding nozzle plate is exposed to high temperatures above the melting point of the molten metal. Used in harsh conditions. In addition, the sliding nozzle plate is designed so that high pressure is applied between the sliding surfaces of the sliding nozzle plate to prevent leakage of molten metal and entrainment of air from between the sliding surfaces of the sliding nozzle plate. It is also strongly restrained or fixed from the lateral direction (especially the sliding direction) so as not to cause damage or breakage.

In this way, the sliding nozzle plate is applied with pressure in the direction of crimping the sliding nozzle plates between the sliding surfaces (hereinafter also referred to as "vertical direction"), and in addition to the pressure in the direction perpendicular to the vertical direction ) also exerts strong pressure to fix its lateral position.

The main body of the sliding nozzle plate is made of refractory material, and because it is constrained by such a strong force and exposed to severe thermal conditions such as high temperature and rapid cooling, cracks and other fractures etc.) is likely to occur.
In order to prevent such destruction of the sliding nozzle plate, as described in the background art of Patent Document 1, it is common to install a metal band (hoop) on the side outer periphery of the main body made of refractory material. target. In addition, Patent Document 1 discloses a space provided along the entire inner peripheral surface of the hoop and a A slide gate having a filling material that communicates with the space and fills the gap existing between the hoop and the plate body through the space, and an injection hole provided in the hoop for injecting the filling material into the space. Disclosed is a plate for

On the other hand, in Patent Document 2, a fitting projection or fitting recess provided on the back of a plate (same as a sliding nozzle plate) is fitted into a fitting recess or fitting projection provided on a plate housing metal frame. In the concave-convex fitting method, for the purpose of accurately and easily aligning the convex fitting portion and the concave fitting portion, the engaging portion is provided at both ends of the plate in the sliding direction, and the plate A plate fixing structure is disclosed in which a housing metal frame is provided with a receiving portion with which the engaging portion engages. That is, Patent Literature 2 discloses a plate structure in which a back plate and a metal strip are integrated and a method of fixing the plate with this structure to a plate housing metal frame.

Further, Patent Document 3 discloses that a fixed plate (same as a sliding nozzle plate) or a sliding plate having a non-sliding surface (same as a sliding nozzle plate) can be easily removed from or attached to a metal frame, and For the purpose of enabling stable replacement work even when the temperature after casting is high, a notch is formed in the metal case on the back side of the sliding surface of the plate, and the metal frame is provided with a projection that fits into the notch. A structure for fixing the plate to the metal frame in the sliding nozzle device is disclosed, and furthermore, it is shown that the main body made of refractory material is installed in the metal case with mortar.

JP-A-11-221665 WO2012/133181 JP-A-9-122898

As mentioned above, the sliding nozzle plate has a metal band around the side circumference of the main body made of refractory material, or a metal case around the side circumference of the metal band, for the purpose of preventing breakage or improving fixing accuracy. It shall be installed and rigidly fixed to the body made of refractory material.
The sliding nozzle plate is manufactured by a structure and method that firmly fixes the refractory main body to the metal band or metal case. Since they are easily deformed or destroyed, the metal band and metal case must be discarded together with the main body made of refractory material. Disposal of such metal strips and metal cases is one of the factors that increase the cost of the sliding nozzle plate.

The problem to be solved by the present invention is to make it possible to easily attach the main body of the sliding nozzle plate made of refractory material to the metal band or metal case installed on the outer periphery of the side part, and to easily remove it. It is to provide a structure, and furthermore, to provide a method of reusing the metal band and metal case.

The present invention is a sliding nozzle plate and a method for reusing the metal band according to the following 1 to 7 .
1.
A sliding nozzle plate comprising a main body made of a refractory material and a metal band on the outer circumference of the side thereof has a space along the entire circumference between the main body and the metal band, and the main body and the metal band are separated from each other. For sliding nozzle plates that are not joined together,
A sliding nozzle plate, wherein a member (hereinafter simply referred to as a "fixing member") for fixing the main body and the metal band to each other is detachably installed in part or all of the space.
2.
Between said main body and said metal band, or with said metal band of a sliding nozzle plate provided with a metal band on the side outer circumference of a main body made of refractory material and a metal case on the side outer circumference of said metal band A space exists over the entire circumference of either one or both of the metal cases, and either or both of the main body and the metal band or the metal band and the metal case For unbonded sliding nozzle plates,
A member (hereinafter simply referred to as a "fixing member") for fixing one or both of the main body and the metal band or the metal band and the metal case is detachable in part or all of the space. Sliding nozzle plate installed in a state of
3.
3. The sliding nozzle plate according to 1 or 2, wherein the fixing member is made of metal or inorganic material.
4.
After using the sliding nozzle plate according to any one of 1 to 3 above for casting steel, the main body of the sliding nozzle plate (hereinafter referred to as "used main body") is used together with the main body. Removed from the later metal strip (hereinafter referred to as "used metal strip"), and an unused main body formed with an outer shape smaller than the used metal strip in the lateral direction, at least between the used metal strip A method for reusing a metal strip of a sliding nozzle plate, which is attached to the used metal strip via a fixing member for fixing a part thereof and used for casting steel.
5.
After the sliding nozzle plate including the metal case described in 2 or 3 above is used for casting steel, the used metal strip including the used main body is used together with the metal case (hereinafter referred to as "used metal case"). ), and the used metal band including the unused main body is attached to the used metal case via a fixing member that fixes at least a part between it and the used metal case, Method for reusing metal strips of sliding nozzle plates used in steel casting.
6.
The sliding nozzle plate after being used for casting steel has an integral structure in which the metal strip is placed on a forming frame and simultaneously formed together with the forming clay when forming the main body. A method of reusing the metal strip of the sliding nozzle plate described.
7.
The sliding nozzle plate after being used for casting steel is an integral structure in which the metal strip is installed on the body by shrink fitting or by winding and welding after forming the body. , the method for reusing the metal strip of the sliding nozzle plate according to 4 or 5 above.

According to the present invention, the refractory main body of the sliding nozzle plate can be easily attached to and removed from the metal band or metal case provided around the side periphery of the sliding nozzle plate.
Furthermore, the metal band and metal case can be reused simply and easily, and the manufacturing cost of the sliding nozzle plate can be reduced.

FIG. 2 is a cross-sectional image diagram showing a general combination structure of a two-plate type sliding nozzle device provided with two sliding nozzle plates (one fixed plate and one sliding plate). BRIEF DESCRIPTION OF THE DRAWINGS The sliding nozzle plate (fixed plate) which is one Embodiment of this invention is shown, (A) is a cross-sectional image figure, (B) is a plane image figure by the side of a sliding surface. Fig. 10 shows a sliding nozzle plate (fixed plate) according to another embodiment of the present invention, where (A) is a cross-sectional image diagram and (B) is a plane image diagram of the sliding surface side. Fig. 10 shows a sliding nozzle plate (fixed plate) that is still another embodiment of the present invention, where (A) is a cross-sectional image diagram and (B) is a plane image diagram of the sliding surface side.

FIG. 1 shows a cross-sectional image of a general combined structure of a two-plate type sliding nozzle device. A general two-plate type sliding nozzle device has two sliding nozzle plates, one fixed plate 1 and one sliding plate 2, and the sliding plate 2 is laterally ( 1) to control the flow rate of the molten metal by changing the area of the openings formed by overlapping the inner holes 3 of the fixed plate 1 and the sliding plate 2. As shown in FIG.
In the fixing plate 1 and the sliding plate 2, the body portions 4 are made of a refractory material, the surfaces where the body portions 4 are in contact with each other are the sliding surfaces 5, and the surfaces opposite to the sliding surfaces 5 are the back surfaces. is 6. Dowels 7 are provided on the rear surface 6, respectively. The dowels 7 of the fixing plate 1 are provided with lower nozzles (not shown), and the dowels 7 of the sliding plate 2 are provided with upper nozzles (not shown). spliced.

FIG. 2 shows a sliding nozzle plate (fixed plate 1A) that is an embodiment of the present invention.
The fixing plate 1A of the present embodiment includes a metal band 8 on the outer periphery of the side portion of the body portion 4 made of a refractory material. and metal strip 8 are not bonded to each other. A fixing member 10 for fixing the main body 4 and the metal band 8 to each other is detachably installed in the space 9 .

The fixing member 10 for fixing the main body 4 and the metal band 8 to each other in this manner presses the main body 4 and the metal band 8 like a wedge to fix them together. It can be a metal plate such as an iron plate or an inorganic material.
In other words, the ring-shaped metal band 8, which is substantially similar to the planar shape of the main body 4 (that is, the outer shape of the side portion), is manufactured to a predetermined size larger than the outer circumference of the main body 4, and Close it, place the main body 4 inside it, insert a fixing member 10 such as a shim iron plate into the space 9 between the main body 4 and the metal band 8 (space 9), etc., and insert the main body 4 and the metal band 8 are to be fixed so as not to be mutually displaced.

This fixing member 10 does not necessarily need to be installed without gaps in the entire space 9, but in a minimum number and arrangement in a part of the space 9 so that the main body 4 and the metal band 8 are fixed to each other. may be installed.
In order to increase the stress dispersion effect and ensure the fixing function, the specific installation location of the fixing member 10 is determined according to the shape (size), structure, etc. of the main body 4 so that the stress can be easily concentrated. It is preferable to disperse and install, for example, a combination of a plurality of axially symmetrical parts so as to be distributed as uniformly as possible over the whole area, mainly in terms of location.

The degree of fixation between the main body 4 and the metal band 8 by the fixing member 10 is adjusted to some extent depending on the composition and physical properties of the refractory material constituting the main body 4, the shape (size), structure, etc. of the main body 4. In some cases, such as the above Patent Document 1 and Patent Document 3, it is not necessary to irreversibly (that is, to the extent that it is almost destroyed when disassembled) firm fixing.
It should be noted that the fixing structure using the fixing member 10 as in this embodiment is not necessarily significantly inferior in fixing or restraining function to the structures disclosed in Patent Documents 1 and 3 above.

FIG. 3 shows a sliding nozzle plate (fixed plate 1B) that is another embodiment of the present invention.
The fixing plate 1B of the present embodiment has a metal back plate 11 installed on the back surface 6 of the fixing plate 1A shown in FIG. Also in this fixing plate 1B, a fixing member 10 for fixing the body portion 4 and the metal band 8 to each other is installed in the space 9 in a detachable manner.

FIG. 4 shows a sliding nozzle plate (fixed plate 1C) that is still another embodiment of the present invention.
The fixing plate 1C of this embodiment includes a metal band 8 on the outer periphery of the side portion of the main body portion 4 made of refractory material, and a metal case 12 on the outer periphery of the side portion of the metal band 8. 8 does not exist, but a space 9 exists between the metal band 8 and the metal case 12 . That is, in the fixing plate 1C of this embodiment, the main body portion 4 and the metal band 8 are joined to each other, but the metal band 8 and the metal case 12 are not joined to each other. A fixing member 10 for fixing the metal band 8 and the metal case 12 to each other is detachably installed in the space 9 . A metal back plate 11 is provided on the back surface 6 of the fixed plate 1C, and a metal case 12 is joined to the back plate 11 by welding or the like.

In this fixing plate 1C, there is no space between the body portion 4 and the metal band 8, and the body portion 4 and the metal band 8 are joined to each other. A space is also provided between the body part 4 and the metal band 8 so that the structure is such that the body part 4 and the metal band 8 are not joined to each other, and the fixing member 10 is detachably installed in the space between the body part 4 and the metal band 8. can also Alternatively, a space may be provided only between the body portion 4 and the metal band 8, and the fixing member 10 may be detachably installed only in that space.

In the fixing method in which the fixing member 10 is installed in the space between the main body 4 and the metal band 8 or in the space between the metal band 8 and the metal case 12, the fixing process itself is shrink-fitting. It is simple and easy compared to the process by method, winding and welding method.
In addition, removing the main body 4 from the metal band 8 after use, or removing the metal band 8 including the main body 4 from the metal case 12 is simple and easy because no fusing or cutting is required.

Next, a method for reusing the metal band 8 will be described.
First, when the fixing plates 1A and 1B in FIGS. 2 and 3 do not include a metal case, the fixing plates 1A and 1B are used for casting steel, and then the main body 4 (used) of the fixing plates 1A and 1B is used. Used main body part) is removed from the metal band 8 (used metal band) after being used together with this main body part 4, and the unused main body part formed to have a smaller outer shape in the side direction than this used metal band is used It is attached to the used metal strip through a fixing member that fixes at least a part between it and the metal strip, and is used for casting steel.

In addition, when the metal case 12 is included as in the fixing plate 1C of FIG. The used metal band 8 including the unused main body is removed from the used metal case 12 used together with these, and the used metal case 12 is fixed through a fixing member that fixes at least a part between the used metal case 12 12 and used for casting steel.

In this method of reusing the metal strip, for example, the metal plate (fixing member) can be installed while adjusting the thickness of the metal plate such as a shim iron plate as a fixing member, the number of layers, etc. The work of setting the used metal band and the work of setting the used metal band including the unused main body in the used metal case are made easier, and the process can be simplified and labor-saving can be achieved.

In the above-mentioned method of reusing the metal strip, the sliding nozzle plate after being used for steel casting is integrated with the metal strip placed on the forming frame at the time of forming the main body and simultaneously formed together with the forming clay. The structure may be an integral structure in which a metal strip is attached to the body by shrink fitting or by winding and welding after the body is molded.

1 Fixed plate (sliding nozzle plate)
2 Sliding plate (sliding nozzle plate)
3 inner hole 4 main body (made of refractory material)
5 sliding surface 6 rear surface 7 metal band 8 metal band 9 space 10 fixing member 11 rear plate 12 metal case

Claims (7)

A sliding nozzle plate comprising a main body made of a refractory material and a metal band on the outer circumference of the side thereof has a space along the entire circumference between the main body and the metal band, and the main body and the metal band are separated from each other. For sliding nozzle plates that are not joined together,
A sliding nozzle plate, wherein a member (hereinafter simply referred to as a "fixing member") for fixing the main body and the metal band to each other is detachably installed in part or all of the space. Between said main body and said metal band, or with said metal band of a sliding nozzle plate provided with a metal band on the side outer circumference of a main body made of refractory material and a metal case on the side outer circumference of said metal band A space exists over the entire circumference of either one or both of the metal cases, and either or both of the main body and the metal band or the metal band and the metal case For unbonded sliding nozzle plates,
A member (hereinafter simply referred to as a "fixing member") for fixing one or both of the main body and the metal band or the metal band and the metal case is detachable in part or all of the space. Sliding nozzle plate installed in a state of 3. The sliding nozzle plate according to claim 1, wherein said fixing member is made of metal or inorganic material. After using the sliding nozzle plate according to any one of claims 1 to 3 for casting steel, the body portion of the sliding nozzle plate (hereinafter referred to as "used body portion") is removed together with the body portion. Remove from the used metal strip (hereinafter referred to as "used metal strip"), and insert an unused main body formed with a side profile smaller than the used metal strip between the used metal strip and the used metal strip A method of reusing a metal strip of a sliding nozzle plate, which is attached to the used metal strip through a fixing member that fixes at least a part of the sliding nozzle plate and is used for casting steel. After using the sliding nozzle plate including the metal case according to claim 2 or claim 3 for casting steel, the used metal strip including the used main body is used together with the metal case (hereinafter referred to as "used metal case”), and attach the used metal band including the unused main body to the used metal case via a fixing member that fixes at least a part between it and the used metal case. method of reusing metal strips of sliding nozzle plates for steel casting. 4. The sliding nozzle plate after being used for casting steel has an integral structure in which the metal strip is placed on a forming frame and simultaneously formed together with the forming clay when forming the main body. 6. A method for reusing the metal strip of the sliding nozzle plate according to 5 . The sliding nozzle plate after being used for casting steel is an integral structure in which the metal strip is installed on the body by shrink fitting or by winding and welding after forming the body. , The method for reusing the metal strip of the sliding nozzle plate according to claim 4 or 5 .

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