KR20110072492A - Segment for continuous casting - Google Patents

Abstract

PURPOSE: A segment for a continuous casting machine is provided to press at least part of a tie rod which connects an upper frame and a lower frame such that the tie rod is bent by a drawing force of a slab to thereby smoothly offset the drawing force. CONSTITUTION: A segment for a continuous casting machine includes an upper frame(110), a lower frame(130), a tie rod(150) and a cylinder(180). The upper frame and the lower frame respectively include a plurality of rollers. The tie rod is extended in the longitudinal direction to connect the upper frame and the lower frame. The cylinder is combined with the tie rod to generate pressure.

Description

Segment for continuous casting

The present invention relates to a segment for a continuous casting machine. In particular, the present invention relates to a segment for a continuous casting machine that can easily tilt the segment during continuous casting.

In general, a continuous casting process continuously injects molten steel into a mold of a predetermined shape, and continuously casts the reacted slabs into the lower side of the mold by slab, bloom, and billet. It is a process for manufacturing semi-finished products of various shapes such as billets.

Referring to FIG. 1, a schematic configuration of a general continuous casting machine (hereinafter, referred to as a 'ring cycle') in which the playing process is performed, and a segment provided in the playing machine will be described.

A general player is a ladle 10 containing molten steel refined in a steelmaking process, and a tundish 20 temporarily receiving the molten steel through an injection nozzle connected to the ladle 10 and temporarily storing the molten steel. ) And a mold (30) for receiving the molten steel temporarily stored in the tundish (20) and initially solidifying the mold into a predetermined shape and a series of moldings while cooling the non-solidified cast (1). The cooling line 40 includes a plurality of segments 50 arranged in series to perform a work. Here, the segment 50 is arranged so that the plurality of rollers 52 and 54 are opposed to each other, and the upper frame 51 and the lower frame 53 and the upper frame 51 and the lower frame 53 spaced apart from each other. A plurality of tie rods (not shown) for connecting up and down, and the pressing force to the slab 1 by adjusting the separation distance between the upper frame 51 and the lower frame 53 by replacing the tie rods with pistons (hereinafter, ' Pressure cylinder ").

The cast steel 1 that has passed through the mold 30 is pressed by a plurality of rollers 52 and 54 while being passed through the spaced space between the upper frame 51 and the lower frame 53 to be formed in a constant formation. At this time, the tie rod supporting the upper frame 51 and the lower frame 53 up and down receives a pulling force of a predetermined size along the casting direction (x direction) of the cast piece 1.

However, in the related art, since the tie rod is formed as a rod having a constant horizontal cross-section, bending is not performed even though it is subjected to a pulling force. Therefore, the pulling force applied to the tie rod is not solved through deformation of the tie rod, but is directly transmitted to the hydraulic cylinder 55 connected to the tie rod, thereby causing a problem in that the hydraulic cylinder 55 is broken. That is, the tie rod causes friction on the inner wall of the hydraulic cylinder 55 due to the pulling force applied from the cast steel 1, which causes the hydraulic cylinder 55 to be damaged and oil leaks. The problem of shortening the service life has been caused.

In addition, the separation distance between the upper frame 51 and the lower frame 53 cannot be precisely controlled due to breakage of the hydraulic cylinder 55, so that the slab 1 cannot be precisely pressed down. Therefore, there is a problem that the quality of the cast 1 is lowered, thereby lowering the productivity of the playing process.

The present invention provides a segment for a continuous casting machine that can prevent the breakage during continuous casting to accurately control the cast slab.

The present invention provides a segment for a continuous caster that can prevent the breakage caused by the pulling force applied to the cast by deforming the shape of the tie rod to facilitate the tilting of the segment during continuous casting.

The present invention provides a segment for a continuous caster to prevent the tie rods from twisting during continuous casting.

According to an embodiment of the present invention, a continuous casting machine segment includes an upper frame and a lower frame, each of which includes a plurality of rollers, a tie rod extending in a longitudinal direction to connect the upper frame and the lower frame, and the tie rod. And a cylinder coupled to generate pressure, wherein at least a portion of the tie rod comprises a segment for a continuous casting machine formed of a tilting deformation portion having a thickness of the horizontal cross section facing the casting direction less than the thickness of the horizontal cross section of the other portion.

In addition, as a modification of the present invention, the tie rod is formed above or below the tilting deformation portion, and a torsion preventing deformation portion having a thickness of a horizontal cross section facing the casting direction is thicker than a thickness of the horizontal cross section of the other portion.

Segment for continuous casting according to another embodiment of the present invention is the upper frame and the lower frame, each of which is provided with a plurality of rollers, extending in the longitudinal direction connecting the upper frame and the lower frame, at least a portion of the horizontal cross-section is cast A tie rod formed of a tilting deformation portion thinner in a direction than a width in a direction crossing the casting direction, and a cylinder coupled to the tie rod to generate pressure.

In addition, as a further modification of the present invention, the tie rod has an upper or lower side of the tilting deformation portion, and a torsion preventing deformation portion having a thickness greater than the width of the horizontal cross section facing the direction in which the thickness of the horizontal cross section facing the casting direction crosses the casting direction. Further formed.

In the continuous casting machine segment according to the embodiments of the present invention, the tie rods connecting the upper frame and the lower frame up and down may be at least partially flattened so as to be bent finely by the pulling force of the cast steel, thereby smoothly canceling the pulling force. .

Therefore, it is possible to prevent damage or breakage of the hydraulic cylinder applying pressure to the segment, thereby reducing the management cost and management time required for the maintenance and repair of the segment for the continuous casting machine. That is, the work efficiency of the playing process can be improved.

In addition, the bending of the tie rod during the continuous casting, and by preventing the twist of the tie rod to prevent the breakage of the segment, through which the cast can be precisely controlled to reduce the slab quality can be improved. In addition, it is possible to improve the productivity of the casting process by reducing the defective rate of the cast.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention in more detail. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only the embodiments make the disclosure of the present invention complete, and the scope of the invention to those skilled in the art. It is provided for complete information. Like reference numerals in the drawings refer to like elements.

Figure 2 is a cross-sectional view schematically showing the internal configuration of the segment for a continuous casting machine according to an embodiment of the present invention, Figure 3 is a perspective view showing the tie rod shown in Figure 2, Figure 4 is a variant of the present invention FIG. 5 is a cross-sectional view schematically illustrating an internal configuration of a segment for a continuous casting machine, FIG. 5 is a perspective view illustrating a tie rod shown in FIG. 4, and FIG. 6 is a segment for a continuous casting machine according to embodiments of the present invention. 7 and 8 are state diagrams and result diagrams for simulating tilting of segments by applying tie rods according to the present invention.

2 to 8, a segment for a continuous casting machine 100 (see FIG. 2) according to an embodiment of the present invention includes an upper frame 110 having a plurality of rollers 120 and 140, respectively. ) And a lower frame 130, a tie rod 150 extending in the longitudinal direction (y direction) to connect the upper frame 110 and the lower frame 130, and the tie rod 150. A cylinder 180 coupled to generate a pressure F, wherein at least a portion P ₃ (see FIG. 3) of the tie rod 150 is a horizontal cross section A facing the casting direction (x direction). ₃ ) the thickness t ₃ is formed of the tilting deformation portion 152 thinner than the thicknesses t ₁ and t ₂ of the horizontal sections A ₁ and A ₂ of the other portions P ₁ and P ₂ .

In addition, in another embodiment of the present invention, the definition of the tie rod 150 may be changed to form a segment for a continuous casting machine. That is, in the segment according to another embodiment, the tie rod extends in the longitudinal direction (y direction) to connect the upper frame 110 and the lower frame 130, and at least a portion (P ₃ ) is the casting direction (x direction) the thickness (t ₃₎ of the heading horizontal section (a ₃₎ is formed as a thin tilting deformation than the width (w ₃₎ of the horizontal cross-section (a ₃₎ towards the direction (z-direction) crossing the casting direction.

In one embodiment of the present invention, the tilting deformation portion 152 formed on a portion of the tie rod 150 is compared with other portions within the same tie rod 150, but in another embodiment of the present invention, other portions of the tie rod are Irrespective of this, the thickness t ₃ and the width w ₃ of the tilting deformation unit 152 itself are compared with each other to determine the size or shape of the horizontal cross section A ₃ .

In the continuous casting machine segment 100 according to the embodiments of the present invention (including one embodiment and another embodiment) as described above, the slab 1 is a space formed between the upper frame 110 and the lower frame 130. After passing through the (S), the cylinder 180 changes the separation distance L between the upper frame 110 and the lower frame 130 connected to the tie rod 150, the upper surface and the lower surface of the cast (1) To the pressure (F). At this time, the cast piece 1 is in contact with the plurality of rollers (120, 140), and applies a pull force in the casting direction (x direction) to the segment 100. In the embodiments of the present invention, in order to prevent the breakage of the segment 100 due to the pulling force applied from the cast steel 1, the tilting deformation portion having the cross-sectional shape deformed so that the cross section moment of inertia (I) becomes small ( 152 was formed in the tie rod 150. That is, during continuous casting of the cast 1, the tie rod 150 is finely bent (bending) along the casting direction (x direction), thereby easily tilting the upper frame 110.

The upper frame 110 and the lower frame 130 are arranged so that a plurality of rollers 120 and 140 respectively face up and down. To this end, a plurality of roller support frames 122 and 142 are provided on the lower surface of the upper frame 110 and the upper surface of the lower frame 130 to fix and support the plurality of rollers 120 and 140. In addition, in the space S between the upper frame 110 and the lower frame 130, the tie rod 150 is inserted inward to protect the tie rod 150 from the outside, while the upper frame 110 and When the separation distance L between the lower frames 130 changes, the protective cases 160 and 170 overlapping each other are provided.

Meanwhile, a plurality of through holes 112 and 132 through which both ends P ₁ and P ₂ of the tie rod 150 are formed in the upper frame 110 and the lower frame 130, respectively.

Position fixing ring for fixing the tie rod 150 to the lower frame 130 in the lower portion (P ₂ ) of the tie rod 150 exposed downward through the through hole 132 formed in the lower frame 130 ( 134) is combined. In addition, the cylinder 180 is coupled to a position where the through hole 112 is formed on the upper side of the upper frame 110, and the upper end P ₁ of the tie rod 150 passes through the through hole 112 and passes through the cylinder 180. Is connected to. At this time, the piston rod 182 is coupled to the tie rod 150 located inside the cylinder 180, and the tie rod 150 is used as a piston of the cylinder 180. Here, the internal space S ₂ of the cylinder 180 is divided into a plurality of spaces by the piston ring 182, and the tie rod 150 in the cylinder 180 by changing the strength of the hydraulic pressure flowing into the divided space. ) Is driven up and down. Accordingly, the distance L between the plurality of rollers 120 and 140 in contact with the upper and lower surfaces of the cast steel 1 may be adjusted by driving control of the cylinder 180, and applied to the cast steel 1. The losing pressure F can be controlled accurately. In the embodiment of the present invention, although the cylinder of the hydraulic type is used as the cylinder 180, it is a matter of course that various cylinders such as a pneumatic method or a power drive method can be applied.

In one embodiment of the present invention, the tie rod 150 has both ends P ₁ and P ₂ in a cylindrical shape, and the horizontal cross sections A ₁ and A _{2 of} both ends P ₁ and P ₂ have a circular shape. That is, in the horizontal sections A ₁ and A ₂ , the thicknesses t ₁ and t ₂ in the casting direction (x direction) and the widths w ₁ and w _{2 in} the direction crossing the casting direction (z direction) are Have the same size. Although not shown, cross sections of both ends P ₁ and P ₂ of the tie rod 150 may be formed in a square shape, and the thicknesses t ₁ and t ₂ and the widths w ₁ and w ₂ may be the same. It is formed in size.

On the other hand, the tilting deformation portion 152 formed on at least a portion of the tie rod 150 has a small cross-sectional moment of inertia (I) so that the tie rod 150 is easily bent by a force applied to the segment 100. do. That is, the thickness t ₃ of the horizontal cross section A ₃ facing the casting direction (x direction) has a flat shape thinner than the width w ₃ facing the direction (z direction) intersecting with the casting direction. Here, in order to maintain the stiffness of the tie rod 150 supporting the upper frame 110 at the upper side of the lower frame 130, the area of the horizontal cross section A ₃ of the tilting deformation portion 152 is adjusted. The tie rod 150 is formed to have the same area as the horizontal cross sections A ₁ and A _{3 of} both ends P ₁ and P ₂ . When the tie rod 150 is made of a material which is not easily deformed or damaged even during continuous casting, the area of the horizontal cross section A ₃ of the tilting deformation unit 152 and the horizontal cross sections A of the both ends P ₁ and P ₂ . ₁ , A ₂ ) can be formed differently.

Further, the tilting transformation section 152 as shown in FIG. 3 the shape of the horizontal cross-section (A _3), oval (FIG. 3 (a) reference), the modified elliptical (Fig. 3 a side edge forms a straight line in parallel (b ) Or a quadrangle (see FIG. 3 (c)).

In the embodiment of the present invention, the tilting deformation portion 152 is formed at the center of the tie rod 150. Of course, the tilting deformation portion 152 may be formed to be adjacent to the upper end portion P ₁ or the lower end portion P ₂ in order to adjust the tilting degree of the upper frame 110.

The tilting deformation portion 152 formed along the extending length direction (y direction) of the tie rod 150 has a length L ₁ formed according to the size of the segment 100, the thickness of the cast steel 1, the material, and the like. Different. That is, in order to more easily tilt the segment 100, the length L ₁ of the tilting deformation part 152 may be increased.

As such, by forming the tilting deformation part 152 having a flat cross-sectional shape in the tie rod 150 supporting the upper frame 110 and the lower frame 130 up and down, the cross-sectional moment of inertia I is reduced. Through this, bending of the tie rod 150 may be easily implemented. The cross-sectional moment of inertia (I) depends on the flatness of the tilting deformation portion 152, that is, the shape, area, and the like of the horizontal cross-section A ₃ of the tilting deformation portion 152, and the value of the cross-section inertia moment I increases. As the bending of the tie rod 150 becomes difficult, the bending of the tie rod 150 becomes easier as the value of the cross-sectional moment of inertia I increases.

Looking at the cross-sectional moment of inertia I related to the horizontal section A ₃ of the tilting deformation unit 152 with reference to the following equations.

Typically, the cross-sectional moment of inertia (I) for the shape of the circular cross section of radius R can be obtained as shown in Equation 1 below.

…… [식 1]

… … [Formula 1]

In addition, when both edges are flatly deformed in the shape of a circular cross section having a radius R, the cross section inertia moment I _x can be obtained as shown in Equation 2 below.

…… [식 2]

… … [Formula 2]

Here, α (radian) is an angle between a parallel line passing through the center of the circular cross section and a straight line passing through the vertex of the flatly deformed portion through the center of the circular cross section, where α is small, that is, a circular cross section. When both sides of the surface are deformed more flatly, the cross-sectional moment of inertia (I _x ) becomes smaller. Therefore, bending may occur more easily as the cross-sectional shape becomes flat in the direction of the force.

On the other hand, Table 1 below shows the relationship between the cross-sectional shape of the tie rod 150, the cross-sectional area (A) of the tilting deformation portion 152, the cross-sectional moment of inertia (I) and bending moment (M). The table summarizes briefly.

TABLE 1

Referring to the above [Table 1], it can be seen that as the cross-sectional shape of the tie rod 150 becomes flat, the size of the cross-sectional moment of inertia (I) gradually decreases.

In addition, the cross-sectional area A 'of the flat shape of the second row (width (w ₃ ): 1.25d, thickness (t ₃ ): 0.625d) is the cross-sectional area A of the circular shape (diameter: d) of the first row. Despite the almost same size as, the moment of inertia of the cross section (I ′) can be seen to be reduced by almost half. That is, it can be seen that the cross-sectional inertia moment I is more affected by the cross-sectional shape than the cross-sectional area A.

On the other hand, the cross-sectional moment of inertia (I) and bending moment (M), as shown in [Table 1], the relationship as shown in [Equation 3] below.

…… [식 3]

… … [Equation 3]

Here, E is the elastic modulus of the tie rod 150, I is the cross-sectional moment of inertia, θ is the tilting angle, L _t is the length of the tie rod 150 (see Fig. 6). Looking at [Equation 3], the proportional relationship between the moment of inertia (I) and the bending moment (M) is established. Therefore, when the tilting deformation portion 152 is formed in the tie rod 150 as in the embodiment of the present invention, the cross-sectional moment of inertia I of the forming portion is reduced, and a small force is required to bend the tie rod 150. The tie rod 150 can be easily bent. That is, the segment 100 can be easily tilted in the casting direction (x direction) of the cast piece 1.

이고, 타이로드(150)의 탄성 계수(E)는 200,000 N/㎟이다.)Looking at the state and results of the simulation of the tilting of the segment 100 with reference to FIGS. 7 and 8, it can be seen that the beam theory according to [Equation 3] and the simulation results of ANSYS, which is a general structural analysis S / W, are almost identical. have. (The length L _t of the tilting deformation portion 152 formed in the tie rod 150 in FIG. 7 (a) is 936 mm, and the thickness t ₃ of the horizontal cross section A ₃ is 50 mm and the width w. ₃ ) is 100 mm, and the distance N between the adjacent tie rods 150 in the segment 100 of FIG. 7B is 600 mm, and the length L _f of the lower frame 130 is 1,200 mm. , The cross section moment of inertia (I) of the tie rod 150 is 959,664

And the elastic modulus E of the tie rod 150 is 200,000 N / mm 2.)

That is, when the segment 100 is tilted at a tilting angle θ of 0.0125 radian, the bending moment M is calculated as 5,126,410 Nmm by the beam theory, and the simulation analysis result by ANSYS is 5,152,600 Nmm. Is calculated. The error between them is 0.5%.

Therefore, by adjusting the thickness t ₃ , the width w ₃ , the length L _t , and the like of the tilting deformation unit 152 through the above experimental results, the degree of tilting of the segment 100 can be accurately controlled. Able to know.

Hereinafter, the segment 100 'for a continuous casting machine according to a modification of the present invention will be described. Here, the contents common to those described in the segment 100 for a continuous casting machine according to an embodiment of the present invention will be omitted.

As shown in FIG. 5, the tie rod 150 ′ provided in the segment 100 ′ (see FIG. 4) for the continuous casting machine according to one embodiment of the present invention has a torsion preventing deformation portion 154 in addition to the tilting deformation portion 152. ) Is further formed. The torsion preventing deformation part 154 is a phenomenon in which the tie rod 150 is twisted or twisted due to deformation of the segment 100 ′ or a roll gap difference between the rollers 120 and 140 due to the plurality of cylinders 180 ( to prevent twisting).

To this end, the anti-twist deformation portion 154 is formed in a flat horizontal cross-section (A ₄ ) thicker than the width (w ₄ ) of the thickness t ₄ toward the casting direction (x direction) toward the direction intersecting the casting direction. . That is, the tie rod 150 ′ is prevented from being twisted by being at right angles to the flat horizontal cross section A ₃ of the tilting deformation portion 152.

The twist prevention deformation part 154 may be formed on the upper side or the lower side of the tilting deformation part 152. In this embodiment, the torsion preventing deformation portion 154 is formed on the lower side of the tilting deformation portion 152 (see FIG. 5). In addition, the tilting deformation portion 152 and the torsion preventing deformation portion 154 may be successively formed along the extending length direction (y direction) of the tie rod 150 ′, and may be formed to be spaced up and down. For example, the tilting deformation portion 152 may be formed adjacent to the upper end portion P ₁ , and the torsion preventing deformation portion 154 may be installed adjacent to the lower end portion P ₂ .

On the other hand, in the embodiment according to the modification of the present invention, when both the tilting deformation portion 152 and the torsion preventing deformation portion 154 is formed on the tie rod 150 ', the forming length (L) of the tilting deformation portion 152 ₁ ) was made to be twice or more than the formation length (L ₂ ) of the torsion-resistant deformation portion 154. The formation lengths L ₁ and L _{2 of the} tilting deformation portion 152 and the anti-twist deformation portion 154 may include the size of the segment 100 ', the tilting degree, the thickness of the slab 1, the material, the pressure F, and the like. Therefore, it may vary.

The flat shape of the horizontal cross section A ₄ of the torsion preventing deformation part 154 may be formed in any one of an elliptical shape and a deformed oval shape or a quadrangular shape in which both edges form parallel straight lines, similar to the tilting deformation part 152. have. In addition, the area of the horizontal cross section A ₄ of the torsion preventing deformation portion 154 is equal to the area of the horizontal cross sections A ₁ and A ₂ of the upper end portion P ₁ or the lower end portion P ₂ of the tie rod 150 ′. It may be formed in the same size, and may be formed in the same size as the area of the horizontal cross-section (A ₃ ) of the tilting deformation portion 152.

As described above, in the continuous casting machine segment according to the embodiments of the present invention, the tie rod for connecting the upper frame and the lower frame up and down is deformed at least a portion so that the bending finely by the pull force of the cast steel to increase the pulling force It can be offset smoothly.

Therefore, it is possible to prevent damage or breakage of the hydraulic cylinder applying pressure to the segment, thereby reducing the management cost and management time required for the maintenance and repair of the segment for the continuous casting machine. That is, the work efficiency of the playing process can be improved.

In addition, the bending of the tie rod during the continuous casting, and by preventing the twist of the tie rod to prevent the breakage of the segment, through which the cast can be precisely controlled to reduce the slab quality can be improved. In addition, it is possible to improve the productivity of the casting process by reducing the defective rate of the cast.

As mentioned above, although this invention was demonstrated with reference to the above-mentioned embodiment and an accompanying drawing, this invention is not limited to this, It is limited by the following claims. Therefore, it will be apparent to those skilled in the art that the present invention may be variously modified and modified without departing from the technical spirit of the following claims.

1 is a view schematically showing the configuration of a typical continuous casting machine.

Figure 2 is a schematic cross-sectional view showing the internal configuration of the segment for a continuous casting machine according to an embodiment of the present invention.

3 is a perspective view of the tie rod shown in FIG.

Figure 4 is a schematic cross-sectional view showing the internal configuration of the segment for a continuous casting machine according to a variant of the present invention.

5 is a perspective view of the tie rod shown in FIG.

Figure 6 is a schematic view showing a state in which the segment for continuous casting machine tilted during continuous casting according to an embodiment of the present invention.

7 and 8 are a state diagram and a result diagram simulating tilting of a segment by applying a tie rod according to the present invention.

Description of the Related Art [0002]

100, 100 ': segment 110: upper frame

130: lower frame 120, 140: roller

110: upper frame 150, 150 ': tie rod

152: tilting deformation portion 154: torsional deformation portion

180: cylinder

Claims (9)

Segment for continuous casting machine, An upper frame and a lower frame each having a plurality of rollers; A tie rod extending in a longitudinal direction to connect the upper frame and the lower frame; A cylinder coupled to the tie rod to generate pressure; Including, At least a portion of the tie rod is formed of a tilting deformation portion having a thickness of a horizontal cross section facing the casting direction less than a thickness of the horizontal cross section of the other portion. The method according to claim 1, The tie rod, Segment for continuous casting machine is formed to the upper or lower side of the tilting deformation portion, the torsion-resistant deformation portion is thicker than the thickness of the horizontal cross-section of the other portion of the horizontal cross section facing the casting direction. The method according to claim 2, The tie rod, Segment for continuous casting machine is formed in the length of the tilting deformation portion extending in the longitudinal direction is formed more than twice the size of the formation length of the torsion-resistant deformation portion. The method according to claim 2, The shape of the horizontal cross section of the tilting deformation portion or the torsion preventing deformation portion is an oval, segment for continuous casting machine is formed in any one of the shape of a modified oval or square consisting of a straight line parallel to both edges. The method according to claim 2 to 4, And an area of the horizontal cross section of the tilting deformation portion and the torsion preventing deformation portion is formed to have the same size as that of the horizontal cross section of the other portion of the tie rod. Segment for continuous casting machine, An upper frame and a lower frame each having a plurality of rollers; A tie rod extending in a longitudinal direction to connect the upper frame and the lower frame, and at least a portion of which is formed of a tilting deformation portion having a thickness of a horizontal cross section facing the casting direction smaller than a width of the horizontal cross section facing the casting direction; ; A cylinder coupled to the tie rod to generate pressure; Segment for continuous casting machine comprising a. The method according to claim 6, The tie rod, Segment for continuous casting machine is formed to the upper side or the lower side of the tilting deformation portion, the torsion-resistant deformation portion is thicker than the width of the horizontal cross-section in the direction of the direction crossing the casting direction, the thickness of the horizontal cross section facing the casting direction. The method of claim 7, The tie rod, Segment for continuous casting machine is formed in the length of the tilting deformation portion extending in the longitudinal direction is formed more than twice the size of the formation length of the torsion-resistant deformation portion. The method of claim 7, The shape of the horizontal cross section of the tilting deformation portion or the torsion preventing deformation portion is an oval, segment for continuous casting machine is formed in any one of the shape of a modified oval or square consisting of a straight line parallel to both edges.

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