WO2024009837A1

WO2024009837A1 - Plate for sliding nozzle device, and manufacturing method and manufacturing device for manufacturing same

Info

Publication number: WO2024009837A1
Application number: PCT/JP2023/023719
Authority: WO
Inventors: 新一福永; 祐大青山; 裕之桃田
Original assignee: 黒崎播磨株式会社
Priority date: 2022-07-06
Filing date: 2023-06-27
Publication date: 2024-01-11
Also published as: JP7169483B1; TW202406645A; JP2024007902A

Abstract

The present invention provides: a plate for a sliding nozzle device with which it is possible to inhibit fracturing or destruction of a plate body, and apply a greater restraining force on the plate body than in a conventional multiple hoop method; and a manufacturing method and a manufacturing device for manufacturing the same. In this plate for a sliding nozzle device, in which a hoop obtained by winding a strip-shaped thin iron sheet B in a plurality of layers is installed on the outer peripheral side surface of a plate body A1 made of a refractory, the maximum compressive strain of the inner peripheral surface of an inner hole in the plate body A1, obtained by a method for using a strain gauge to measure the strain released when the hoop is cut, is 200-1500 με inclusive. This plate can be obtained using a manufacturing device provided with a tightening mechanism 3 that includes a pressing jig 31 for holding the strip-shaped thin iron sheet B while being displaced along the outer peripheral side surface of the plate body A1, so that the strip-shaped thin iron sheet B follows the outer peripheral side surface of the plate body A1 at the portion at which the strip-shaped thin iron sheet B comes into contact with the outer peripheral side surface of the plate body A1.

Description

Plate for sliding nozzle device, its manufacturing method and manufacturing device

The present invention relates to a plate for a sliding nozzle device used to control the flow of molten steel discharged from a container such as a ladle or tundish used in a casting device, and a method and apparatus for manufacturing the same.
In addition, in the present invention, a plate for a sliding nozzle device refers to a plate-like component as an integrated structure that includes a plate body made of a refractory material, a hoop, etc., and is attached to a sliding nozzle device. .

In the plate for a sliding nozzle device, a band-shaped metal plate is installed on the outer peripheral side of the plate body made of refractory material to suppress cracks during use and prevent collapse during recovery. It is common to restrain the plate body with a band-shaped metal plate.
The band-shaped metal plate installed on the outer peripheral side of the plate body is mainly a relatively thin band-shaped metal plate (hereinafter referred to as ``band-shaped thin iron plate''. Most have a thickness of about 0.4 to 0.6 mm.) The so-called multi-hoop method, in which multiple layers are wound to form a multi-layer structure, and the thickness is thicker than the above-mentioned strip-shaped thin iron plate (mostly about 3 mm or more thick), which is shaped into a loop shape to match the shape of the outer peripheral side of the plate body. ) There is a so-called shrink fitting method (also called a hot band method) in which a metal plate is heated to expand and then fitted into the plate body.

However, with the conventional multiple hoop method, (1) the restraining force on the plate body is weaker than that of the shrink-fitting method (about 1/2), (2) the effect of suppressing cracks/destruction of the plate body is small, and (3) the plate body There were problems such as the hoop coming off and the plate body collapsing when used many times.
As a countermeasure, for example, Patent Document 1 states, ``A groove is provided in a part of the circumferential surface of the plate (same as the plate body), and the bent end portion of the steel strip (same as the strip-shaped thin iron plate) is fitted into this groove. A plate for a sliding nozzle has been proposed in which the remainder of the steel strip is tightly wound and fixed around the circumferential side of the plate.
Patent Document 1 discloses that when a steel strip (strip-shaped thin iron plate) is stretched around a plate body, the hoop loosens due to insufficient fixation of at least the first layer of steel strip (strip-shaped thin iron plate) to the plate body. This is an attempt to eliminate problems such as tightening and poor tightening.
However, even with this proposed method, the restraining force on the plate body was still at a level that could not be said to be sufficient, and the above-mentioned problems of the multiple hoop system still remained. For this reason, most of them have recently shifted to the shrink-fitting method.

By the way, as shown in Patent Document 2 as well as the above-mentioned Patent Document 1, the shape of the outer circumferential side of the plate body is not entirely circular or nearly perfect, but has bent portions, straight lines, or almost straight lines. It has a section or is oval in shape. In such a shape that is not a perfect circle or almost a perfect circle, although the plate body is tightened and restrained by the band-shaped metal plate, the tightening force or restraint force cannot be uniform throughout, and there is has a stronger restraining force than straight lines or gently curved parts. Particularly in a band-shaped metal plate having a thickness of about 3 mm or more used in the shrink-fitting method, its deformability is small, so local stress is generated in the plate body, and the plate body is likely to crack or break.
In addition, in the shrink-fitting method, even if the band-shaped metal plate is looped to match the shape of the outer peripheral side of the plate body, the deformation due to thermal expansion/contraction of the band-shaped metal plate does not follow the shape of the outer peripheral side of the plate body. The restraining force on the main body is not uniform. Especially when the shape of the outer peripheral side of the plate body has a bent part, the degree of adhesion and degree of restraint differs depending on the part near the bent part of the plate body, making it impossible to restrain the entire outer peripheral side of the plate body with a uniform force. In addition, since the behavior of each part of the strip metal plate (specifically, the degree of expansion/contraction) differs in response to temperature changes during shrink fitting and during use during operation, uneven stress may be applied to the inside of the plate body made of refractory material. This tends to cause cracks and destruction in the plate body.
Furthermore, with the shrink-fitting method, it is difficult to make delicate adjustments when manufacturing loop-shaped metal plates that match the outer peripheral side shape of each plate body and installing them on the plate body, resulting in low precision and difficulty in automation. However, there are also problems such as the need for large-scale equipment to achieve automation, which increases the cost of materials, installation work, etc.

Microfilm of Utility Application No. 59-173615 (Utility Application No. 61-87652) Special Publication No. 58-48835

In view of the above, the problem to be solved by the present invention is to provide a sliding nozzle device that can suppress cracks and destruction of the plate body, and can also strengthen the restraining force on the plate body compared to the conventional multiple hoop system. An object of the present invention is to provide a plate for use in the manufacturing process, a method for manufacturing the same, and a manufacturing device for the same.

In order to solve the above problems, the present inventors closely observed the occurrence of cracks and fractures in various plate bodies during actual operations and analyzed the causes thereof. As a result, it was found that in order to suppress cracks and destruction of the plate body in actual operation, it is important to improve the uniformity of the restraining force on the plate body by the band-shaped metal plate installed on the outer peripheral side of the plate body. Ta. Therefore, the present inventors decided to adopt a multi-hoop method instead of a shrink-fitting method as an installation method for the band-shaped metal plate to be installed on the outer peripheral side surface of the plate body.
On the other hand, it has been pointed out that the multi-hoop method has a weaker restraining force on the plate body than the shrink-fitting method, and that the effect of suppressing cracks/destruction of the plate body is small. Therefore, the present inventors also analyzed in detail the relationship between the occurrence of cracks and fractures in various plate bodies in actual operation and the restraining force on the plate bodies. As a result, in order to suppress cracks and destruction of the plate body in actual operation of the multiple hoop system, it is necessary to It has been found that it is sufficient to set it within a specific range that is larger than that of the hoop method. Specifically, in order to keep the maximum compressive strain on the inner peripheral surface of the inner hole of the plate body within a specific range, a holding jig is used to hold the thin iron strip so that it follows the outer peripheral surface of the plate body. The present invention was completed by considering methods and devices that were previously used.

That is, according to one aspect of the present invention, the following plate for a sliding nozzle device is provided.
A plate for a sliding nozzle device, in which a hoop made of a plurality of layers of strip-shaped thin iron plates is installed on the outer peripheral side of a plate body made of a refractory material,
A plate for a sliding nozzle device, wherein the maximum compressive strain of the inner circumferential surface of the inner hole of the plate body is 200 με or more and 1500 με or less, as measured by a method of measuring the strain released when the hoop is cut using a strain gauge.

According to another aspect of the present invention, the following method of manufacturing a plate for a sliding nozzle device is provided.
A method for manufacturing a plate for a sliding nozzle device, in which a hoop made of a plurality of layers of strip-shaped thin iron plates is installed on the outer peripheral side of a plate body made of a refractory material, the method comprising:
a seaming step of seaming the strip-shaped thin iron plate while heating and applying tensile force to the outer peripheral side surface of the plate body;
In the seaming step, the band-shaped thin iron plate is tightened by a holding jig that is displaced along the outer circumferential side of the plate body so that the band-shaped thin iron plate follows the outer circumferential side of the plate body at a portion where the thin iron plate begins to contact the outer circumferential side of the plate body. A method of manufacturing a plate for a sliding nozzle device, including a process of suppressing a thin iron plate.

According to still another aspect of the present invention, the following plate manufacturing apparatus for a sliding nozzle device is provided.
A manufacturing device for a plate for a sliding nozzle device, in which a hoop made of a plurality of layers of strip-shaped thin iron plates is installed on the outer peripheral side of a plate body made of a refractory material,
A seaming mechanism is provided on the outer circumferential side of the plate body for seaming the belt-shaped thin iron plate while heating it and applying a tensile force,
The seaming mechanism moves the strip-shaped thin iron plate while being displaced along the outer circumferential side of the plate body so that the strip-shaped thin iron plate follows the outer circumferential side of the plate body at a portion where the strip-shaped thin iron plate begins to contact the outer circumferential side of the plate body. A manufacturing device for plates for sliding nozzle devices, including a holding jig.

According to the present invention, it is possible to suppress cracks and destruction of the plate body in a plate for a sliding nozzle device. Furthermore, the restraint force on the plate body can be made stronger than in the conventional multiple hoop system.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a configuration example of an apparatus for manufacturing a plate for a sliding nozzle device according to the present invention, with the upper stage being a plan view and the lower stage being a front view. FIG. 2 is a schematic diagram showing a state in which the winding start end of a strip-shaped thin iron plate is fixed to the outer circumferential side of a plate body. The schematic diagram which shows an example of the fixing method of the winding start end part of a strip-shaped thin iron plate. The schematic diagram which shows the other example of the fixing method of the winding start end part of a strip-shaped thin iron plate. FIG. 3 is a schematic diagram showing an example of the shape of a recess provided in a part of the outer peripheral side surface of the plate body. FIG. 3 is a schematic diagram showing a seaming process using a presser jig that holds down the strip-shaped thin iron plate so that the strip-shaped thin iron plate follows the outer circumferential surface of the plate body. The schematic diagram which shows the process of winding the strip-shaped thin iron plate of a 2nd layer. The schematic diagram which shows the example of a structure which integrated the hoop and the fixing member. The figure which shows the shape and dimension of the plate main body used for an Example, a comparative example, and a reference example. The schematic diagram which shows the measuring method of the maximum compressive strain of the inner peripheral surface of the inner hole of a plate main body. 3 is a graph showing the measurement results of the maximum compressive strain of the inner circumferential surface of the inner hole of the plate body in the plates of Examples, Comparative Examples, and Reference Examples. Graph showing the relationship between heating temperature and maximum compressive strain of a strip-shaped thin iron plate. A graph showing the relationship between the tensile force applied to a strip-shaped thin iron plate and the maximum compressive strain.

First, a manufacturing device for a plate for a sliding nozzle device (hereinafter referred to as "plate manufacturing device") according to the present invention will be described. FIG. 1 shows an example of the configuration of a plate manufacturing apparatus, with the upper diagram showing a plan view and the lower diagram showing a front view.

The plate manufacturing apparatus shown in the figure includes a plate holding mechanism 1 that holds a plate main body A1, which is the main body of a plate for a sliding nozzle device (hereinafter simply referred to as "plate"), and a plurality of layers on the outer peripheral side of the plate main body A1. An iron plate holding mechanism 2 that holds the band-shaped thin iron plate B that is wound to form a hoop; and a seaming mechanism that tightens the band-shaped thin iron plate B while heating and applying tensile force to the outer peripheral side of the plate body. 3.

The plate holding mechanism 1 includes a mounting table 11 on which the plate main body A1 is placed, and a motor 12 that rotates this mounting table 11 in a horizontal plane. Specifically, the motor 12 rotates the rotating shaft 111 extending vertically downward from the lower surface of the mounting table 11 around its axis, thereby rotating the mounting table 11 in a horizontal plane. In this embodiment, the rotational speed of the motor 12 can be controlled by an inverter, and the number of rotations thereof can also be controlled.

As shown in the upper part of FIG. 1, fixing jigs 13 are incorporated in the mounting table 11 at multiple locations (10 locations in this embodiment) as fixing means for fixing the plate main body A1 to the mounting table 11. There is. These fixing jigs 13 are built in so that they can move forward and backward relative to the outer peripheral side surface of the plate main body A1, and when fixing the plate main body A1 to the mounting table 11, the tips of these fixing jigs 13 Advance it until it hits the side and clamp it at that position. In addition, in this embodiment, the tips of these fixing jigs 13 are attached to the plate body A1 so that the tips of these fixing jigs 13 do not get in the way when winding the strip-shaped thin iron plate B around the outer peripheral side of the plate body A1. It abuts against the lower end side of the outer circumferential side (for example, at a height of several mm from the lower end surface of the plate main body A1).
Note that the mode of the fixing means for fixing the plate main body A1 to the mounting table 11 is not limited to the fixing jig 13 as in this embodiment, but may be a mode that uses attraction force by a magnet or a vacuum, or a mode that uses the attraction force of a magnet or vacuum, or A fixing jig may be installed in the inner hole A1a of the main body A1 to fix the main body A1.

The iron plate holding mechanism 2 includes a holding stand 21 that holds a strip-shaped thin iron plate B wound into a coil, and a rotary shaft 211 extending vertically downward from the lower surface of this holding stand 21 so as to be rotatable around its axis. A bearing part 22 is included. The coiled strip-shaped thin iron plate B held on the holding stand 21 is dispensed by the holding stand 21 rotating within a horizontal plane. Actually, when the strip-shaped thin iron plate B is wound around the outer circumferential side of the plate main body A1, the holding table 21 is rotated by pulling the strip-shaped thin iron plate B, and the strip-shaped thin iron plate B is accordingly discharged.
In this embodiment, the bearing section 22 includes an air brake 221 as a brake mechanism. This air brake 221 applies a braking force to the rotating shaft 211 according to air pressure. As a result, a braking force acts on the rotation of the holding table 21. In this embodiment, a tensile force is applied to the strip-shaped thin iron plate B by this braking force. The strength of this braking force can be adjusted by adjusting the air pressure of the air brake 221, and thereby the tensile force applied to the strip-shaped thin iron plate B can be changed.
Although not shown, the iron plate holding mechanism 2 can include means for adjusting the vertical position (height) of the strip-shaped thin iron plate B delivered from the holding table 21.

The seaming mechanism 3 includes a presser jig 31. Although the details will be described later, the holding jig 31 holds down the strip-shaped thin iron plate B so that the strip-shaped thin iron plate B follows the outer circumferential surface of the plate main body A1 at the portion where the strip-shaped thin iron plate B starts to contact the outer circumferential surface of the plate main body A1. In this embodiment, the presser jig 31 is attached such that its intermediate portion is rotatable around the pin 311. Further, a base end portion of the presser jig 31 is connected to a cylinder rod 312a of an air cylinder 312. That is, as the cylinder rod 312a of the air cylinder 312 moves back and forth, the presser jig 31 rotates around the pin 311. Thereby, the holding part 31a at the tip of the holding jig 31 can be displaced so as to follow the outer circumferential side surface of the plate main body A1. In addition, in this embodiment, the presser part 31a is comprised by the roller which rolls along the outer peripheral side of plate main body A1.

In this embodiment, the seaming mechanism 3 further includes two

pressing jigs

32A and 32B. Although the details will be described later, the two

pressing jigs

32A and 32B each touch the vicinity of the winding start end of the strip-shaped thin iron plate B to the plate body A1 when winding the strip-shaped thin iron plate B around the outer peripheral side of the plate body A1. Press it against the outer circumferential side to fix it. In addition, the two

pressing jigs

32A and 32B are placed at a fixing position where the vicinity of the winding start end of the strip-shaped thin iron plate B is pressed against the outer peripheral side surface of the plate body A1, and at a fixed position where the vicinity of the winding start end of the strip-shaped thin iron plate B is pressed and fixed. When winding the second layer of strip-shaped thin iron plate, it can be moved to a retracted position that does not interfere with the winding of the second layer of strip-shaped thin iron plate. In this embodiment, the two

pressing jigs

32A and 32B are movable in the horizontal and vertical directions, respectively, and by a combination of horizontal and vertical movements, they can be moved to the above-mentioned fixed position and retracted position. ing.

In this embodiment, the plate manufacturing apparatus includes an induction heating coil 4 as a heating means for heating the strip-shaped thin iron plate B. The induction heating coil 4 heats the strip-shaped thin iron plate B, which moves horizontally from the iron plate holding mechanism 2 toward the plate holding mechanism 1, by induction heating. Further, a radiation thermometer 41 is attached to the induction heating coil 4 as a thermometer for measuring the temperature of the strip-shaped thin iron plate B heated by the induction heating coil 4. In this embodiment, the induction heating coil 4 heats the strip-shaped thin iron plate B so that the temperature measured by the radiation thermometer 41 becomes a preset target temperature. Here, the target temperature can be set and changed, and by changing the setting of the target temperature, the heating temperature of the strip-shaped thin iron plate B can be changed.
Note that the heating method of the heating means for heating the strip-shaped thin iron plate B is not limited to induction heating, and may also be electrical heating or gas burner heating. Further, the thermometer type is not limited to a radiation thermometer, and other non-contact thermometers such as an infrared thermometer may be used.

Next, a method for manufacturing a plate using the plate manufacturing apparatus shown in FIG. 1 will be described.
First, as schematically shown in FIG. 2, the winding start end of the strip-shaped thin iron plate B is fixed to a predetermined location on the outer peripheral side surface of the plate main body A1 fixed to the mounting table 11. In this embodiment, the plate main body A1 has a recess A1b in a part of its outer circumferential side surface, and the winding start end of the strip-shaped thin iron plate B is fixed to the location where the recess A1b is located.

FIG. 3 shows an example of the fixing method. In this example, the winding start end of the strip-shaped thin iron plate B is placed so as to cover the recess A1b (FIG. 3(a)), and then the welding machine 5 is used to open the recess from the outside of the winding start end of the strip-shaped thin iron plate B. Penetration welding is performed toward the inside of A1b (Fig. 3(b) to (c)). As a result, the molten material of the strip-shaped thin iron plate B enters into the recess A1b and solidifies to become a fixing member A1c, and the winding start end of the strip-shaped thin iron plate B is fixed to this fixing member A1c.

FIG. 4 shows another example of a method for fixing the winding start end of the strip-shaped thin iron plate B. In this example, a fixing member A1c made of iron or the like is placed in advance in the recess A1b (FIG. 4(a)). The rest is similar to the example shown in FIG. 3, and the winding start end of the strip-shaped thin iron plate B is placed so as to cover the concave portion A1b (FIG. 4(b)), and then the welding machine 5 is used to weld the strip-shaped thin iron plate B. Penetration welding is performed from the outside of the winding start end into the recess A1b (FIGS. 4(c) to (d)). As a result, the fixing member A1c in the recess A1b and the winding start end of the strip-shaped thin iron plate B are welded, and the winding start end of the strip-shaped thin iron plate B is fixed to the fixing member A1c.

As for the configuration of the plate obtained in both FIGS. 3 and 4, the plate main body A1 has a recess A1b in a part of its outer circumferential side surface, a fixing member A1c in the recess A1b, and a strip-shaped thin iron plate. The winding start end of B is fixed to the fixing member A1c. In this way, by fixing the winding start end of the strip thin iron plate B to the fixing member A1c in the recess A1b, when winding the strip thin iron plate B around the outer peripheral side of the plate body A, the winding of the strip thin iron plate B can be easily fixed. It is possible to prevent the starting end from shifting in position, and it can contribute to strengthening the restraining force on the plate main body A.
Note that the welding machine 5 shown in FIGS. 3 and 4 is not shown in FIG. 1.
Furthermore, the means for fixing the winding start end of the strip-shaped thin iron plate B and the fixing member A1c in the recess A1b is not limited to welding, but may also be mechanical means such as screwing or driving, or adhesive.

Here, the shape of the recess A1b is determined in the tensile direction of the strip-shaped thin iron plate B (in the direction of the arrow in FIG. ) is preferably a shape including an inner wall surface A1b1 forming an acute angle with respect to the inner wall surface A1b1.

Once the winding start end of the strip-shaped thin iron plate B has been fixed to the fixing member A1c in the recess A1b, the two

pressing jigs

32A and 32B are moved to the fixing positions, respectively, as schematically shown in FIG. . As a result, the vicinity of the winding start end of the strip-shaped thin iron plate B is pressed and fixed to the outer peripheral side surface of the plate body at two locations (two

pressing jigs

32A, 32B). In addition, in FIG. 2, the vicinity of the winding start end of the strip-shaped thin iron plate B is fixed at two places, but it may be fixed at at least one place (at least one of the two

pressing jigs

32A and 32B). . In this way, by pressing and fixing the vicinity of the winding start end of the strip-shaped thin iron plate B to the outer circumferential side surface of the plate body A1 at at least one location, it is possible to suppress the positional shift of the winding start end of the strip-shaped thin iron plate B. This can contribute to strengthening the restraining force on the plate body A.

After the fixation of the winding start end and the vicinity of the winding start end of the belt-shaped thin iron plate B is completed, a seaming process is performed in which the belt-shaped thin iron plate B is tightened while heating and applying tensile force to the outer peripheral side of the plate body A1. conduct. Specifically, by rotating the plate body A1 fixed to the mounting table 11 in a horizontal plane by driving the motor 12, the band-shaped thin iron plate B is wound and tightened around the outer peripheral side of the plate body A1. As schematically shown in FIG. 6, this seaming process is performed so that the strip-shaped thin iron plate B follows the outer circumferential surface of the plate main body A1 at the portion where the strip-shaped thin iron plate B starts to contact the outer circumferential surface of the plate main body A1. The step includes a step of holding down the strip-shaped thin iron plate B with a holding jig 31.
In addition, in this seaming step, a predetermined tensile force is applied to the strip-shaped thin iron plate B by the braking force of the air brake 221 mentioned above, and the strip-shaped thin iron plate B is heated to a predetermined temperature by the above-mentioned induction heating coil 4. has been done.
In this way, in the seaming process of the present embodiment, seaming is performed while heating and applying tensile force to the strip-shaped thin iron plate B on the outer circumferential side of the plate body A1. The strip-shaped thin iron plate B is held down by the holding jig 31 so as to follow the outer peripheral side surface of the main body A1. As a result, the restraining force on the plate body A1 can be made stronger than in the conventional multiple hoop system.

Here, the restraining force on the plate body A1 can be adjusted by changing at least one of the heating temperature of the strip-shaped thin iron plate B, the tensile force applied to the strip-shaped thin iron plate B, and the number of layers of the strip-shaped thin iron plate B. can.
Of these, the heating temperature of the strip-shaped thin iron plate B can be changed by changing the setting of the target temperature for heating by the induction heating coil 4, for example, within the range of 200 to 800°C, as described above. can.
Further, as mentioned above, the tensile force applied to the strip-shaped thin iron plate B can be changed by changing the strength of the braking force of the air brake 221, for example, in the range of 30 to 400 kgf (approximately 0.3 to 4 kN). It can be changed within.
Furthermore, the number of layers of the strip-shaped thin iron plate B can be changed by changing the rotation speed of the motor 12, that is, the number of turns of the strip-shaped thin iron plate B, and can be changed, for example, within the range of 2 to 10 layers.

Next, the process of winding the second layer of strip-shaped thin iron plate B will be explained. As explained with reference to FIG. 2, when winding the first layer of strip-shaped thin iron plate B, at least one place near the winding start end of the strip-shaped thin iron plate B (two

pressing jigs

32A, 32B) is wound. At least one side) is fixed before seaming. Thereafter, when winding the second layer of strip thin iron plate B near the winding start end of the first layer of strip thin iron plate B, as schematically shown in FIG. The second layer of strip-shaped thin iron plate B is wound while pressing and fixing the vicinity of the starting end to the outer peripheral side surface of the plate body A1 at at least one location (at least one of the two

pressing jigs

32A, 32B). Specifically, as shown in FIGS. 7(a) to 7(e), when winding the second layer of strip-shaped thin iron plate B near the winding start end of strip-shaped thin iron plate B, two pressing jigs are applied. By sequentially moving the

tools

32A and 32B to the above-mentioned fixed position and retracted position, two layers are formed while pressing and fixing the vicinity of the winding start end of the strip-shaped thin iron plate B to the outer circumferential side of the plate body A1 at at least one place. Wind the strip-shaped thin iron plate B. Note that in FIG. 7, of the two

pressing jigs

32A and 32B, only the pressing jig that has been moved to the fixed position is shown, and the pressing jig that has been moved to the retracted position is not shown. A distinction is made between the pressing jig that has been moved to the retracted position and the pressing jig that has been moved to the retracted position.

In this way, when winding the second layer of strip thin iron plate B near the winding start end of the first layer strip thin iron plate B, the vicinity of the winding start end of the first layer strip thin iron plate B is wound at least once. By winding the second layer strip-shaped thin iron plate B while pressing and fixing it to the outer circumferential side of the plate main body A1 at a location (at least one of the two

pressing jigs

32A, 32B), the first layer strip-shaped thin iron plate When winding the second layer of strip-shaped thin iron plate B near the winding start end of B, it is possible to suppress loosening of the first layer of strip-shaped thin iron plate B, and strengthen the binding force on the plate body A. can contribute to Also, when winding the third layer of the strip thin iron plate B near the winding start end of the second layer strip thin iron plate B, at least one place near the winding start end of the second layer strip thin iron plate B is wound. The third layer of strip-shaped thin iron plate B can be wound while pressing and fixing it against the outer circumferential side of the plate main body A1 using (at least one of the two

pressing jigs

32A and 32B). This prevents loosening of the first and second layer thin iron strips B when winding the third layer thin iron strip B near the winding start end of the second layer thin iron strip B. This can contribute to strengthening the restraining force on the plate main body A.

In this way, it is possible to obtain a plate in which a hoop formed by winding a plurality of layers of strip-shaped thin iron plates is installed on the outer circumferential side of the plate body. According to this plate, the restraining force on the plate body can be made stronger than in the conventional multiple hoop system, as shown in the embodiments described later. More specifically, the maximum compressive strain on the inner peripheral surface of the inner hole of the plate body can be set to 200 με or more and 1500 με or less by measuring the strain released when the hoop is cut using a strain gauge. Cracks and destruction of the plate body can be suppressed. Note that the above-mentioned upper limit value (1500 με) of the maximum compressive strain was set in consideration of the actual results of the conventional hot band method, etc.

Here, as schematically shown in FIG. 8, a hoop A2 formed by winding a plurality of layers of strip-shaped thin iron plates B on the outer circumferential side of a plate body A1 is welded, for example, as explained in FIGS. 3 and 4. By performing penetration welding from the outside of the hoop A2 toward the inside of the recess A1b using the machine 5, a hole A2a reaching from the outermost layer of the hoop A2 to the fixing member A1c is provided, and the hoop A2 and the fixing member A1c are inserted into this hole A2a. It is also possible to have a structure filled with a material (in the example of FIG. 8, a melt of the strip-shaped thin iron plate B) that integrates the two. With such a configuration, loosening of the hoop A2 can be suppressed, and the restraining force on the plate body A can be strengthened.

The most important technical feature of the manufacturing apparatus and manufacturing method described above is that, as shown in FIG. The purpose is to suppress the strip-shaped thin iron plate B by using the following method. That is, in the manufacturing apparatus and manufacturing method of the present invention, the technical features shown in FIGS. 3 to 5, FIG. 7, and FIG. 8 can be omitted.

As an example of the present invention, a plurality of multi-hoop type plates were manufactured using the above-described manufacturing apparatus and manufacturing method. Further, as a comparative example, a plurality of multi-hoop type plates were manufactured using the conventional manufacturing method disclosed in Patent Document 2 mentioned above. Furthermore, a plurality of hot band type plates were also produced as reference examples. FIG. 9 shows the shape and dimensions of the plate main body A1 used in these examples, comparative examples, and reference examples. This plate body A1 was made of a refractory material, and the elastic modulus of the refractory material was within the range of 46 to 53 GPa.
Furthermore, the material of the strip-shaped thin iron plates used in the Examples and Comparative Examples was general structural rolled steel SS400, and the dimensions were 1 mm thick x 30 mm wide. Furthermore, in the multiple hoop method of the examples and comparative examples, the heating temperature of the strip-shaped thin iron plate was 700° C., and the tensile force was 150 kgf. Further, the number of layers of the strip-shaped thin iron plate was 3 to 6 layers in the examples, and 6 to 8 layers in the comparative examples.
On the other hand, the material of the metal plate (HB) used in the reference example of the hot band method was also general structural rolled steel SS400, and the dimensions were 3 to 6 mm thick x 30 mm wide. Further, in the hot band method, the heating temperature of the metal plate (HB) was set at 400 to 600°C.

For each plate produced as an example, a comparative example, and a reference example, the maximum compressive strain of the inner peripheral surface of the inner hole of the plate body, which is correlated with the magnitude of the restraining force on the plate body, was measured. FIG. 10 schematically shows a method for measuring this maximum compressive strain. As shown in the figure, strain gauges C1 to C4 are evenly pasted at four locations on the sliding surface A1d side of the inner circumferential surface of the inner hole A1a of the plate body A1, and then the hoop A2 is cut, and at this time, the released The strain is measured using strain gauges C1 to C4, and the maximum value is taken as the maximum compressive strain. Here, the types of strain gauges C1 to C4 are "foil strain gauges", and their sizes are such that they can be evenly pasted at four locations on the sliding surface A1d side of the inner peripheral surface of the inner hole A1a. do. Specifically, in the present Examples, Comparative Examples, and Reference Examples, gauges having a gauge length of 5 mm and a gauge width of 1.4 mm were used.

FIG. 11 shows the measurement results. In addition, in the same figure, one plot is the measurement result of one plate.
As can be seen from the figure, in the comparative example using the conventional multiple hoop method, the maximum compressive strain was less than 200 με. On the other hand, in all Examples, the maximum compressive strain was 200 με or more and 1500 με or less, and a restraining force equivalent to that of the hot band method as a reference example was obtained.
In addition, in the examples, there was a tendency for the maximum compressive strain to increase as the number of layers of the strip-shaped thin iron plate increased, but in the comparative example, even if the number of layers of the strip-shaped thin iron plate was increased, the maximum compressive strain did not necessarily increase. The reason for this is that in the comparative example, a presser jig was not used during seaming as in the example, so the first and second layers were loosened, and even if layers were stacked on top of them, the binding force was still strong. This is because the maximum compressive strain does not increase as a result.
Further, in the reference example, the variation in maximum compressive strain is larger than in the example. Here, variations in the maximum compressive strain are due to variations in the shape and material (modulus of elasticity) of the plate body, and variations in conditions such as heating temperature when installing the hoop. Since there are variations in the dimensions of the hoop itself, there is a large variation in the maximum compressive strain.
From the above, according to the multiple hoop method of the present invention, the uniformity of the restraint force on the plate body is improved compared to the hot band method, and the restraint force can be made stronger than the conventional multiple hoop method. As a result, it can be said that cracking and destruction of the plate body in a plate for a sliding nozzle device can be suppressed.

Next, an example of adjustment for adjusting the restraining force on the plate body in the multiple hoop system of the present invention will be illustrated.
The shape and dimensions of the plate body A1 used in this adjustment example were the same as in the previous example (see FIG. 9), and the elastic modulus of the refractory was also within the same range of 46 to 53 GPa as in the previous example. On the other hand, the number of layers of the strip-shaped thin iron plate was five. Then, in Adjustment Example 1, the heating temperature of the strip-shaped thin iron plate was changed, and in Adjustment Example 2, the tensile force applied to the strip-shaped thin iron plate was varied, and the maximum compressive strain was measured for each.

12 and 13 show the measurement results of the maximum compressive strain in Adjustment Example 1 and Adjustment Example 2, respectively. From FIGS. 12 and 13, it can be seen that the maximum compressive strain, that is, the restraining force on the plate body, can be adjusted by changing the heating temperature of the thin iron strip and the tensile force applied to the thin iron strip.

A Plate A1 Plate body A1a Inner hole A1b Recess A1b1 Inner wall surface forming an acute angle with respect to the tension direction of the thin steel strip A1c Fixed member A1d Sliding surface A2 Hoop A2a Hole B Thin steel strip C1-4 Strain gauge 1 Plate holding mechanism 11 Mounting table 111 Rotating shaft 12 Motor 13 Fixing jig (fixing means)
2 Steel plate holding mechanism 21 Holding stand 211 Rotating shaft 22 Bearing portion 221 Air brake (brake mechanism)
3 Sealing mechanism 31 Presser jig 31a Presser part (roller)
311 Pin 312 Air cylinder

312a Cylinder rod

32A, 32B Pressing jig 4 Induction heating coil (heating means)
41 Radiation thermometer (thermometer)
5 Welding machine

Claims

A plate for a sliding nozzle device, in which a hoop made of a plurality of layers of strip-shaped thin iron plates is installed on the outer peripheral side of a plate body made of a refractory material,
A plate for a sliding nozzle device, wherein the maximum compressive strain of the inner circumferential surface of the inner hole of the plate body is 200 με or more and 1500 με or less, as measured by a method of measuring the strain released when the hoop is cut using a strain gauge.
The sliding device according to claim 1, wherein the plate main body has a recess in a part of the outer circumferential side, and a fixing member is provided in the recess, and a winding start end of the strip-shaped thin iron plate is fixed to the fixing member. Plate for nozzle device.
The sliding nozzle device according to claim 2, wherein the hoop has a hole extending from the outermost layer of the hoop to the fixing member, and the hole is filled with a material that integrates the hoop and the fixing member. plate for.
A method for manufacturing a plate for a sliding nozzle device, in which a hoop made of a plurality of layers of strip-shaped thin iron plates is installed on the outer peripheral side of a plate body made of a refractory material, the method comprising:
a seaming step of seaming the strip-shaped thin iron plate while heating and applying tensile force to the outer peripheral side surface of the plate body;
In the seaming step, the band-shaped thin iron plate is tightened by a holding jig that is displaced along the outer circumferential side of the plate body so that the band-shaped thin iron plate follows the outer circumferential side of the plate body at a portion where the thin iron plate begins to contact the outer circumferential side of the plate body. A method of manufacturing a plate for a sliding nozzle device, including a process of suppressing a thin iron plate.
The seaming step includes a step of pressing and fixing the vicinity of the winding start end of the strip-shaped thin iron plate to the outer circumferential side surface of the plate body at least at one place, and a step of fixing the belt-shaped thin iron plate near the winding start end. When winding the belt-shaped thin iron plate, the second layer of the belt-shaped thin iron plate is wound while pressing and fixing the vicinity of the winding start end of the belt-shaped thin iron plate to the outer circumferential side of the plate main body at least at one location. A method for manufacturing a plate for a sliding nozzle device according to claim 4, comprising:
In the seaming step, the binding force on the plate body is increased by changing at least one of the heating temperature of the thin iron strip, the tensile force applied to the thin iron strip, and the number of layers of the thin iron strip. The method for manufacturing a plate for a sliding nozzle device according to claim 4 or 5, wherein the plate is adjusted.
A manufacturing device for a plate for a sliding nozzle device, in which a hoop made of a plurality of layers of strip-shaped thin iron plates is installed on the outer peripheral side of a plate body made of a refractory material,
A seaming mechanism is provided on the outer circumferential side of the plate body for seaming the belt-shaped thin iron plate while heating it and applying a tensile force,
The seaming mechanism moves the strip-shaped thin iron plate while being displaced along the outer circumferential side of the plate body so that the strip-shaped thin iron plate follows the outer circumferential side of the plate body at a portion where the strip-shaped thin iron plate begins to contact the outer circumferential side of the plate body. A manufacturing device for plates for sliding nozzle devices, including a holding jig.
The seaming mechanism includes at least two pressing jigs for pressing and fixing the vicinity of the winding start end of the belt-shaped thin iron plate against the outer peripheral side surface of the plate body, and each pressing jig is configured to press and fix the vicinity of the winding start end of the belt-shaped thin iron plate, and each pressing jig is configured to A fixing position in which the vicinity of the winding start end is pressed against the outer peripheral side surface of the plate body, and a fixing position in which the second layer of the thin iron strip is wound on the vicinity of the winding start end of the strip thin iron plate. 8. The apparatus for manufacturing a plate for a sliding nozzle device according to claim 7, which is movable to a retracted position that does not interfere with winding of the strip-shaped thin iron plate.
The sliding nozzle device according to claim 7 or 8, comprising means for changing at least one of the heating temperature of the strip-shaped thin iron plate, the tensile force applied to the strip-shaped thin iron plate, and the number of layers of the strip-shaped thin iron plate. plate manufacturing equipment.