KR101411372B1 - Segment for continuous casting apparatus - Google Patents

Abstract

A continuous casting machine segment capable of improving the internal quality of a casting conveyed according to a continuous casting process is disclosed.
An embodiment of the segment for a continuous casting machine according to the present invention is a segment for a continuous casting machine including an upper frame and a lower frame spaced apart from each other in a vertical direction with a feed path interposed therebetween and disposed on a face opposing between the upper frame and the lower frame Integrally formed with the integral rollers, wherein the integrated rollers are arranged on opposite sides of the integrated rollers in contact with the conveying rollers, And a backup roller that contacts and supports the recording medium.

Description

[0001] SEGMENT FOR CONTINUOUS CASTING APPARATUS [0002]

The present invention relates to a segment for a continuous casting machine, and more particularly to a segment for a continuous casting machine capable of improving the internal quality of a casting conveyed in accordance with a continuous casting process.

The continuous casting process continuously injects molten steel into a mold and draws a semi-solidified casting continuously to the lower side of the mold to produce a slab, a slab, a billet, And the like are manufactured.

In particular, the apparatus (or equipment) in which the continuous casting process is performed is referred to as a continuous casting machine, and a schematic configuration of the continuous casting machine can be confirmed from FIG.

A general continuous casting machine 1 includes a ladle 10 for receiving refined molten steel in a steelmaking process and a tundish 20 connected to the ladle for receiving molten steel through an injection nozzle and temporarily storing the molten steel. A mold 30 for introducing molten steel from the tundish to solidify in a predetermined shape and a plurality of segments for performing a molding operation while progressively cooling the cast steel S not solidified at the bottom of the casting mold 40).

In particular, referring to FIG. 2, the internal structure of the segment 40 for a continuous casting machine can be confirmed. As shown in FIG. 2, the entire frame 41 is divided into upper and lower parts, which are referred to as an upper frame 42 and a lower frame 44 .

A tie rod 50 is provided to connect the upper frame 42 and the lower frame 44. A hydraulic cylinder 60 is provided concentrically with the upper frame 42 in the vertical direction, do. The hydraulic cylinder 60 is driven to expand and contract in the vertical direction by controlling the hydraulic pressure of the working fluid introduced from the outside, thereby providing a descent force to the slab S.

According to the action of the segment 40, the slab S is formed into various shapes through a continuous casting process.

On the other hand, a plurality of rollers 43 and 45 are provided side by side along the feeding direction of the cast steel at opposed portions between the upper frame 42 and the lower frame 44. The billet is contacted by the plurality of rollers 43 and 45 as it passes through the segment 40 to prevent bulging deformation due to the iron static pressure.

The plurality of rollers 43 and 45 are composed of an upper roller 43 disposed on the side of the upper frame 42 and a lower roller 45 disposed on the side of the lower frame 44 to be rotatable. However, the overall length of the upper roller 43 and the lower roller 45 is provided to correspond to the width of the cast steel, but is not an integral structure, and the entire length is divided into a plurality of sections. The divided rollers 43a and 45a are provided with bearing members 43b and 45b on the connecting portion.

However, in the case where the roller structure that contacts and rotates on the cast steel is connected by a plurality of division rollers 43a and 45a and a plurality of bearing members 43b and 45b as described above, the state in which the bearing members 43b and 45b are located And the internal quality deteriorates at the contact portion of the convenience.

Considering this point, it is possible to effectively prevent the occurrence of the bulging due to the static pressure on the cast steel passing through the inside of the segment, and to avoid the direct contact friction between the bearing members 43b and 45b and the cast steel, There is a need for a method for improving the quality of the formed cast steel.

The present invention provides a segment for a continuous casting machine which can improve the quality of the cast steel by suppressing the induction of the bulge passing through the inside of the segment during the continuous casting process.

The present invention also provides a continuous casting machine for a continuous casting machine, which can improve the structure of a roller structure mounted inside a segment in order to suppress the induction of bulging of the casting and prevent the internal quality of the casting from being lowered by contact friction with the bearing member, Lt; / RTI >

According to an embodiment of the present invention, there is provided a continuous casting segment including an upper frame and a lower frame spaced apart from each other in the vertical direction by a feeding path between the upper and lower frames, A single-piece roller in contact with the bottom surface of the casting being conveyed and rotating, and the entire length section is integrally formed; And a back-up roller disposed on the opposite side of the integral roller in contact with the casting being conveyed, the back-up roller contacting and supporting the integral roller while pivotally rotating with the integral roller.

Wherein the integrated roller includes an upper integral roller which is rotated at a lower surface of the upper frame and a lower integral roller which is arranged to face the integral roller and pivotal on the upper surface of the lower frame, An upper backup roller which is in contact with and supported by the lower backup rollers, and a lower backup roller which is in contact with and supports the lower integral rollers.

The integrated roller includes a one-piece roller member having a length corresponding to the width of the casting and having the same length as the entire length of the roller member, and a pair of roller members for restricting both end positions of the integral roller member, So as to be able to rotate the bearing member.

At this time, the integral roller member may be disposed in contact with the casting piece being conveyed, or may be disposed at a position at a predetermined distance from the casting piece being conveyed and in contact with the casting piece when the casting piece is deformed.

In addition, the backup roller supports the integral roller in a section where bulging deformation due to an iron static pressure is largely generated during the entire length section of the integral roller, and the backup roller has a shorter length than the integral roller Shaped roller member symmetrically and dividedly disposed with respect to the center of the length of the integral roller, and a divided bearing member for restraining both ends of the divided roller member.

According to one embodiment of the segment for a continuous casting machine of the present invention, the internal quality of the cast steel formed by the continuous casting process can be improved.

Particularly, a single-piece roller having a length corresponding to the width of the cast steel can be disposed on the lower side of the cast steel passing through the segment, thereby preventing the bulging of the cast steel in the width direction.

In addition, it is possible to complement the structural rigidity of the one-piece roller by contacting and supporting the backup roller on a section in which bending deformation due to bulging of the casting is likely to occur with respect to the entire length of the integral roller.

Thus, by completely eliminating the use of the bearing member, which had previously been interposed between the dividing rollers when the dividing roller was used, it is possible to prevent internal quality defects of the casting due to contact between the bearing member and the cast during the continuous casting process .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an overall schematic view of a general continuous casting machine and a perspective view schematically showing segments for a continuous casting machine. Fig.
Fig. 2 is a side cross-sectional structural view schematically showing the internal structure of a segment for a general continuous casting machine; Fig.
3 is a perspective view schematically showing the configuration of a segment for a continuous casting machine in an embodiment of the present invention.
4 is an enlarged view of a roller configuration provided in a segment for a continuous casting machine according to an embodiment of the present invention;
5 is a view for explaining an action of preventing bulge induction by a roller structure provided in a segment for a continuous casting machine according to an embodiment of the present invention.
6 is an enlarged view of still another embodiment of a roller configuration provided in a segment for a continuous casting machine according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view illustrating a positional relationship between an integrated casting contact roller and a separable backup roller in a roller structure provided in a segment for a continuous casting machine according to an embodiment of the present invention; FIG.
FIG. 8 is a photograph of an electron microscope analyzer showing internal defects of a billet to be improved by a segment for a continuous casting machine according to embodiments of the present invention. FIG.

Hereinafter, a preferred embodiment of a segment for a continuous casting machine according to the present invention will be described in detail with reference to the accompanying drawings.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor shall appropriately define the concept of the term in order to describe its invention in the best way It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications may be present.

3 is a perspective view schematically showing the configuration of a segment for a continuous casting machine in an embodiment of the present invention.

Referring to FIG. 3, the continuous casting machine segment 100 is formed as a pair of frames which are vertically spaced apart from each other with a feed path therebetween. Here, the frame connected to the upper portion is referred to as an upper frame 110 for convenience of explanation, and the frame connected to the lower portion is referred to as a lower frame 150 for convenience of explanation.

Particularly, integral rollers 120 and 160 are provided on the opposing surfaces between the upper frame 110 and the lower frame 150. [ And at least one backup roller 130 (not shown) for supporting each integral roller in contact with each of the integral rollers, that is, between each of the integral rollers and the upper frame 110 and the lower frame 150, , 170 are provided.

First, an overall configuration of the segment 100 for a continuous casting machine will be briefly described, and then an integral roller and a backup roller, which are characteristic configurations of the segment 100 for a continuous casting machine according to the embodiment of the present invention, will be described in detail.

A continuous casting machine is a device (or facility) for performing a continuous casting process, which is a well-known technique, in which molten steel is continuously injected into a mold in accordance with a continuous casting process, and a semi-solidified casting is continuously drawn to the lower side of the mold . As a result, the slab is formed into semi-finished products of various shapes such as slab, slab, billet and the like.

In the steelmaking process, the refined molten steel is stored in a ladle, and through the injection nozzle, the molten steel is temporarily stored in a tundish. Thereafter, the molten steel introduced into the mold solidifies in a certain shape. In the lower part of the mold, a device for performing a molding operation while cooling a non-solidified cast steel is a segment.

The continuous casting segment 100 has an overall frame shape including a pair of upper and lower frames, that is, an upper frame 110 and a lower frame 150, as shown in FIG.

A predetermined spacing space is provided between the upper frame 110 and the lower frame 150. The spacing corresponds to the feeding path of the main feeder (that is, the feeding direction of the main feeder in FIG. 3).

Between the upper frame 110 and the lower frame 150, there is arranged a roller configuration including an integral roller and a backup roller, which prevents bulging of the casting due to the static pressure.

On the other hand, the upper frame 110 and the lower frame 150 are vertically connected by a tie rod 180. A hydraulic cylinder 190 is provided through the upper frame 110 concentrically with the tie rods 180.

The hydraulic cylinder 190 adjusts the distance between the upper frame 110 and the lower frame 150 through the hydraulic control using the working fluid introduced from the outside, To the load.

The continuous casting machine segment 100 may further include a plurality of girders 102 as a structure for reinforcing the structural rigidity through the entire frame.

The continuous casting segment 100 according to the embodiment of the present invention includes a plurality of integral rollers 120 and 160 and a plurality of backup rollers 130 and 130 on the surface where the upper frame 110 and the lower frame 120 face each other. 170).

The integral rollers 120 and 160 are disposed on the opposing surfaces between the upper frame 110 and the lower frame 150 and rotate in direct contact with the lower surface of the casting during conveyance.

Particularly, the integral rollers 120 and 160 are formed integrally with the entire length section. The term " integrally formed " means that the entire length is divided into a plurality of sections and then divided and then connected using a separate bearing member, but a single It means that it is made of body.

The backup rollers 130 and 170 are configured such that a load is applied to the integral rollers 120 and 160 when a bulging phenomenon occurs on the opposite side of the integrated rollers 120 and 160 in contact with the conveyed slab, Is placed on the opposite side to which it is applied.

Accordingly, the backup rollers 130 and 170 support the integral rollers 120 and 160 while interlocking with the integral rollers 120 and 160 in contact with each other. In other words, since the integral rollers 120 and 160 do not have a bearing member for supporting each section except for both ends, bending (or bending) deformation may occur up or down in a specific section. Thereby preventing the integral rollers 120 and 160 from being deformed.

Referring to FIG. 3, the integrated rollers 120 and 160 and the backup rollers 130 and 170 are denoted by different reference numerals depending on the positions of the upper frame and the lower frame. In other words, a plurality of integrated rollers disposed on the upper frame 110 side is referred to as an upper integrated rollers 120, and a lower integrated rollers 170 disposed on the lower frame 150 side is referred to as a lower integrated rollers 170. Similarly, supporting the upper integral roller 120 at the upper frame 110 side of the plurality of backup rollers is referred to as an upper backup roller 130, and supporting the lower integral roller 160 at the lower frame 150 side And is referred to as a lower backup roller 170. The upper integral roller 120 and the lower integral roller 160 may have the same structure. The upper backup roller 130 and the lower backup roller 130 may have the same structure, The roller 170 may also have the same configuration.

4 is an enlarged view of a roller structure provided in a segment for a continuous casting machine according to an embodiment of the present invention.

4, integrated rollers 120 and 160 and upper and lower backup rollers 130 and 130, which support the integral rollers, are disposed on upper and lower sides, respectively, with a slab S being conveyed in a predetermined direction , 170 are disclosed.

The integral rollers 120 and 160 are composed of the integral roller members 121 and 161 and the integral bearing members 123 and 163. Here, the integral roller members 121 and 161 have a length corresponding to the width size of the slab S and have the same diameter with respect to the entire length section.

Integrated bearing members 123 and 163 are provided at both ends of the one-piece roller members 121 and 161, respectively.

The integral bearing members 123 and 163 are disposed at both ends of the integral roller members 121 and 161 so as to be away from the width of the cast steel S so as to avoid interference with the cast steel S being conveyed.

The backup rollers 130 and 170 are disposed on the opposite sides of the integral roller members 121 and 161 in contact with the slab S, respectively.

The backup rollers 130 and 170 structurally reinforce the bending of the integral roller members 121 and 161 under a relatively large load in a certain section when they are abutted and supported so as to prevent bulging of the casting. For reference, FIG. 5 is referred to.

FIG. 5 is an operation diagram for explaining the action of preventing the bulge induction by the roller portion provided in the segment for the continuous casting machine according to the embodiment of the present invention.

As shown in FIG. 5, the cast S to be conveyed into the segment according to the continuous casting machine may have an uncooled region S 'except for both ends of the width and a part of the width outside the center. Particularly in this S 'region, the fluid has a state and behavior similar to that of the fluid, and the problem of bulging due to iron static pressure may occur.

More specifically, bulging of the cast steel can occur in the non-solidified region S 'inside the cast slab shown in Fig. In this S 'region, the thickness of the cast steel may be deformed, and the initial thickness W1 may expand to W2 as W2. This is called bulging. Therefore, the integral rollers 120 and 160 are brought into contact with the upper and lower portions of the slab S to prevent the bulge S from being generated.

As described above, although the integral rollers 120 and 160 may be slightly different from each other, they are not subjected to a uniform load in any section with respect to the entire longitudinal direction. This is because larger deformation may occur where there is an un-solidified region inside the cast. Therefore, it is preferable that the backup roller is disposed so as to firmly support the one-piece roller in a section where a larger load is generated on the integral roller in consideration of different load differences in each section.

Referring again to FIG. 4, a predetermined gap t (for example, about 1 mm) is formed between the upper and lower integral roller members 121 and 161 and the cast steel S, respectively.

In particular, such an interval can be determined in consideration of the degree of deformation of the cast steel. That is, when bulging occurs in the cast steel due to the iron static pressure, as described above, considering the expansion of the thickness of the cast steel in a specific region (i.e., DELTA W = W2-W1) . As another embodiment, the present invention is also included in the scope of the present invention in the case where the cast steel is initially placed in contact with the integrated rollers 121 and 161 in the course of conveyance (that is, when t = 0). That is, the interval may be appropriately varied depending on the process conditions and the user's intention.

The backup rollers 130 and 170, that is, the backup rollers 130a, 130b, 170a, and 170b are provided symmetrically with respect to the lengths of the integral roller members 121 and 161. However, the position and the number of the backup rollers may be slightly different for each embodiment. For example, referring to FIG. 6, the integral roller members 121 and 161 are divided into three sections to form three backup rollers, that is, the upper backup rollers 130a, 130b and 130c and the lower backup rollers 170: 170a, 170b and 170c Can be seen symmetrically with respect to each other.

In this way, the backup roller may be slightly different in the number and position so as to appropriately reinforce the structure of the integral roller in consideration of the bulging deformation of the cast steel.

The backup rollers 130 and 170 are provided with split roller members 131a, 131b, 171a, and 171b and split bearing members 133a, 133b, 173a, and 173b that restrict the positions of both ends of the split roller member, 173b. Here, the split type bearing members are shown as being arranged in pairs at both ends of the split roller member, but they may be connected in a larger number.

FIG. 7 is a cross-sectional view illustrating a positional relationship between an integral casting contact roller and a separable backup roller among rollers provided in a segment for a continuous casting machine according to an embodiment of the present invention.

Referring to FIG. 7, there is shown a state of a cast slab S being conveyed in a segment for a continuous casting machine, in which the integrated rollers are disposed below the cast slab S, and the structure in which the backup rollers are arranged in contact therewith can be confirmed .

7A, the structure corresponds to a structure in which the center c1 of the integral roller and the center c2 of the backup roller coincide with each other on the same vertical line. In this case, the vertical downward force (i.e., F1) acts from the center c1 of the integral roller due to the load applied from the casting, and the backup roller exhibits the same vertical upward reaction force (i.e., R) Lt; / RTI > That is, the reaction force (i.e., R) acting on the backup roller is preferably designed to be larger than F1.

7 (b), the center c1 of the integral roller and the center c2 of the backup roller are disposed apart from each other. In particular, the back-up roller is disposed obliquely . In this case, the load applied from the casting, together with the vertical downward force (F1) acting from the center (c1) of the integral roller, together with the lateral force (F2) acting in the X- Can occur simultaneously. Therefore, at the center of the backup roller, a reaction force (i.e., R ') is generated in an inclined direction toward the center of the integral roller, and this tilting reaction force (i.e., R') is proportional to the magnitude and direction of the resultant force of F1 and F2 It is desirable to design it larger than this.

Figure 8 is a photograph of an electron microscope analyzer showing internal defects in a slab to be improved by a segment for a continuous casting machine according to embodiments of the present invention.

Referring to FIG. 8, in a case where a plurality of roller structures are directly formed on the cast steel in accordance with the prior art, and the bearing members are interposed between the divided rollers, It is an internal quality electron microscope analyzer (EPMA) photograph.

Particularly, when the dotted line area in FIG. 8, that is, the S 'area is examined, it can be seen that inclusions and pores are included in the inside of the cast steel and the internal quality of the cast steel is deteriorated.

Such a problem of internal quality deterioration of the cast steel is caused by friction of the main cast steel in direct contact with the bearing member. According to the embodiments of the present invention, since the roller structure that is in direct contact friction with the cast steel is limited to the integral roller, It is possible to prevent the internal degradation from occurring.

As described above, according to the embodiment of the segment for a continuous casting machine of the present invention, the internal quality of the cast steel formed by the continuous casting process can be improved.

Particularly, a single-piece roller having a length corresponding to the width of the cast steel can be disposed on the lower side of the cast steel passing through the segment, thereby preventing the bulging of the cast steel in the width direction. In addition, it is possible to complement the structural rigidity of the one-piece roller by contacting and supporting the backup roller on a section in which bending deformation due to bulging of the casting is likely to occur with respect to the entire length of the integral roller.

Thus, by completely eliminating the use of the bearing member, which had previously been interposed between the dividing rollers when the dividing roller was used, it is possible to prevent internal quality defects of the casting due to contact between the bearing member and the cast during the continuous casting process .

The preferred embodiments of the segment for a continuous casting machine according to the present invention have been described above.

It is to be understood that one embodiment of the invention described above is to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description. It is intended that all changes and modifications that come within the meaning and range of equivalency of the claims are intended to be embraced therein.

S: Casting
100: A segment for a continuous casting machine according to an embodiment of the present invention
101: full frame
110: upper frame
120: upper integrated roller
121: upper integral roller member 123: upper integral type bearing member
130 (130a, 130b, 130c): Upper backup roller
131a, 131b: upper split roller member 133a, 133b: upper split roller bearing member 133a,
150: Lower frame
160: Lower integrated rollers
161: Lower unit type roller member 163: Lower unitary bearing member
170 (170a, 170b, 170c): Lower backup roller
171a and 171b: lower split roller members 173a and 173b: lower split type bearing member
180: Tie rod
190: Hydraulic cylinder

Claims (5)

A continuous casting machine segment comprising an upper frame and a lower frame spaced apart in the vertical direction with a casting path therebetween,
An integral roller disposed on an opposing face between the upper frame and the lower frame and rotated in contact with a lower surface of the casting during conveyance, the entire length of which is integrally formed; And
And a back-up roller disposed on the opposite side of the integral roller in contact with the casting being conveyed, the backup roller being rotatable in association with the integral roller,
The backup roller
Wherein the integral roller supports the integral roller in a section where a bulging deformation due to an iron static pressure is largely generated during the entire length of the integral roller,
Shaped roller member having a length shorter than that of the integral roller and symmetrically divided and disposed with respect to the center of the length of the integral roller,
And a split type bearing member for restricting both end positions of the split roller member,
The backup roller
Wherein the inclined roller is disposed obliquely downwardly from the integral roller toward the strip feed direction,
Wherein a reaction force (R ') generated from the center of the backup roller toward the center of the integral roller is formed so as to be greater than a resultant force of a force in the vertical direction and a force in the horizontal direction acting on the integral roller Continuous casting segment.
The method according to claim 1,
Wherein the integrated roller includes an upper integral roller which rotates at a lower surface of the upper frame and a lower integral roller which is disposed to face the integral roller and pivots at an upper surface of the lower frame,
Wherein the backup roller includes an upper backup roller interlocked with and supporting the upper integral roller and a lower backup roller interlocked with and supporting the lower integral roller.
The method according to claim 1 or 2,
In the integrated roller,
A one-piece roller member having a length corresponding to the width of the casting sheet and having the same length as the entire length section,
Wherein the integral bearing member restrains both end positions of the integral roller member and is disposed so as not to interfere with the feed path of the casting.
The method of claim 3,
The integral roller member
A continuous casting machine segment disposed in contact with the casting being conveyed or placed at a position at a distance from the casting being conveyed so as to be contactable at the time of deformation of the casting.
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