JP5260240B2 - Cooling roll scouring device for twin roll continuous casting equipment - Google Patents

Abstract

A device for cleaning a chilled roll of a twin roll caster having a pair of counter- rotated chilled rolls (1) is disclosed. The device comprises a brush roll (9) having a roll barrel member adapted to be positioned parallel with the chilled roll. The roll barrel member comprises a plurality of brushes (7) connected to the roll barrel member for contacting an outer periphery of the chilled roll, with the brushes being spaced apart along the length of the roll barrel member. The device also comprises a rotary drive means (10) for rotating the brush roll such that when the brushes contact the outer periphery of the chilled roll the brushes move in the same or a direction opposite to a direction of movement of the outer periphery of the chilled roll. The device also comprises a pushing means (11) for urging the brush roll against the chilled roll.

Description

  The present invention relates to a cooling roll polishing apparatus for a twin roll type continuous casting apparatus.

  In general, as a method for producing strips directly from the molten metal, a twin-roll type is used in which the molten metal is supplied between a pair of cooling rolls arranged at a required interval in the horizontal direction and the solidified metal is fed as a strip-shaped thin plate. Although continuous casting equipment is used, with the accumulation of operation time, oxides containing manganese (Mn), silicon (Si), etc. adhere to the outer peripheral surface of the cooling roll, and these oxide adhesion layers When the thickness increases, heat transfer from the molten metal to the cooling roll is hindered, and the growth of the solidified shell on the outer peripheral surface of the cooling roll is suppressed.

  Therefore, a cylindrical brush roll that is in contact with the cooling roll over the entire length in the axial direction of the outer circumferential surface is arranged, and the brush roll is rotated in the same direction as the cooling roll to perform the cleaning of the outer circumferential face of the cooling roll. Then, the oxide adhesion layer is removed.

  In the conventional case, the brush roll is configured such that a bristle body (stainless steel fine wire, etc.) folded in half so as to embrace a bar is sandwiched inside a channel-shaped brush holding member that extends straight. It is manufactured by forming a brush holding member in which a piece is flocked over the entire length, winding the brush holding member tightly in the axial direction of the cylindrical roll body member, and fixing it by welding or the like. Produced dense flocking type brush rolls have been mainly used.

  The cooling roll is provided with a crown according to the desired steel plate thickness profile, and the axial shape of the outer peripheral surface of the cooling roll is complicated due to thermal stress when it is subjected to a thermal load and becomes high temperature during casting. However, the densely flocked type brush roll has high rigidity because the hair is planted at high density, and the elastic deformation of each hair is not utilized, and the followability to the outer peripheral surface of the cooling roll is high. In some cases, it was poor and sufficient polishing performance could not be exhibited.

  As a result, it becomes difficult to evenly sharpen the outer peripheral surface of the cooling roll having a complicated profile, leaving an uneven thickness of the oxide layer on the outer peripheral surface of the cooling roll, and removing a large amount of heat from the molten metal. On the outer peripheral surface of the cooling roll that performs the role of performing solidification, the heat removal from the molten metal becomes non-uniform, causing thickness unevenness of the solidified and manufactured steel sheet, and reducing the yield.

  Therefore, as described above, instead of winding the brush holding member tightly in the axial direction of the cylindrical roll body member and fixing it by welding or the like, the brush holding member is formed in a gentle spiral shape with respect to the roll body member. It is possible to make use of the elastic deformation of each hair body by winding and fixing by welding or the like, to improve the followability to the outer peripheral surface of the cooling roll, and to exhibit sufficient scouring performance. Has been proposed by.

In addition, it is not a brush roll for cleaning the outer peripheral surface of the cooling roll of the twin roll type continuous casting apparatus, but shows a general technical level of a brush roll having a spiral brush piece for cleaning the components of the printing press. For example, there is Patent Document 1.
Japanese Patent Laid-Open No. 4-232059

  However, the invention disclosed in Patent Document 1 is used to “loosen” dust or the like adhering to a blanket cylinder of a printing press, whereas in the cooling roll polishing apparatus of a twin roll type continuous casting apparatus, The oxide deposited on the outer peripheral surface of the cooling roll needs to be “scraped off”.

  Further, paragraph [0029] of Patent Document 1 describes that “the spiral brush 24 is driven by a blanket cylinder 28”, and as shown in FIG. Since the rotating portion follows the blanket cylinder 28 so that the moving direction of the outer peripheral surface of the blanket cylinder 28 is the same as the moving direction of the outer peripheral surface of the blanket cylinder 28 at the contact portion with respect to the outer peripheral surface of the blanket cylinder 28, No drive means is provided.

  Furthermore, the “means for changing the rotation speed of the brush means” described in paragraph [0029] of Patent Document 1 means the flicker blade 82 shown in FIG. 7 of Patent Document 1, and the flicker blade. By bringing 82 into contact with the brush 24, the brush speed is reduced.

  That is, although an example using a spiral brush is certainly disclosed in Patent Document 1, there is no description about the effect of adopting the spiral brush, and thus a blanket cylinder of a printing press The invention disclosed in Patent Document 1 used for “relaxing” dust adhering to the surface of a twin roll type continuous casting apparatus that needs to “scrap off” the oxide deposited on the outer peripheral surface of the cooling roll. The current situation is that it is difficult to simply use it as a cooling roll sharpening device.

  In view of such a situation, the present invention can surely scrape the oxide deposited on the outer peripheral surface over the entire effective width of the cooling roll, and uniformize the heat removal from the molten metal on the outer peripheral surface of the cooling roll. An object of the present invention is to provide a cooling roll scouring device for a twin roll type continuous casting apparatus that can improve the yield by eliminating thickness unevenness of a steel sheet that is solidified and manufactured from a molten metal.

The present invention relates to a cooling roll sharpening device for a twin roll type continuous casting apparatus in which a molten metal is supplied between a pair of cooling rolls arranged at a required interval in the horizontal direction and solidified metal is fed as a strip-shaped thin plate. ,
A rotatable roll body member disposed in parallel with the cooling roll having a crown provided on an outer peripheral surface; and a brush piece planted on the roll body member so as to contact the outer peripheral surface of the cooling roll; By forming the space on the roll body member as a space that is not implanted in the vicinity of the brush piece in the circumferential direction , each brush piece can be sufficiently elastically deformed to adapt to the outer peripheral surface of the cooling roll, and the cooling roll is uniform. A brush roll having a non-flocked portion , which enables smooth polishing ;
Rotation drive means for rotating the brush roll so that its moving direction is opposite to the moving direction of the outer peripheral surface of the cooling roll at the contact portion of the brush piece with the outer peripheral surface of the cooling roll;
And a pressing means for urging the brush roll in a direction in which the brush roll is pressed against the cooling roll.

  According to the above means, the following operation can be obtained.

  The brush roll is cooled by the pressing means while the brush roll is rotationally driven by the rotation driving means so that the moving direction of the brush piece contacts the outer peripheral surface of the cooling roll is opposite to the moving direction of the outer peripheral surface of the cooling roll. When pressed against the roll, the axial shape of the outer peripheral surface of the cooling roll, which is crowned according to the desired steel plate thickness profile, is complicated by thermal stress in the state of being subjected to a thermal load and becoming hot during casting. Even if it has a unique shape, the brush roll has a non-planted portion as a non-planted space in the vicinity of the circumferential direction of the brush piece in the roll body member. Unlike rolls, the elastic deformation of the individual hairs forming the brush pieces is fully utilized, and the followability to the outer peripheral surface of the cooling roll is improved. The outer peripheral surface of the chill roll exhibiting a smooth profile can be evenly polished, and the thickness of the oxide layer does not remain uneven on the outer peripheral surface of the chill roll. In the outer peripheral surface of the cooling roll carrying the heat, the heat removal from the molten metal becomes uniform, and the thickness unevenness of the steel sheet to be solidified and manufactured is less likely to be produced, and the yield can be improved.

  In the cooling roll polishing apparatus of the twin roll type continuous casting apparatus, it is preferable to form the non-flocked portion by arranging the brush pieces of the brush roll in a spiral shape.

  According to the cooling roll scouring device of the twin roll type continuous casting apparatus of the present invention, it is possible to reliably scrape the oxide deposited on the outer peripheral surface over the entire effective width of the cooling roll, and the outer peripheral surface of the cooling roll. The heat removal from the molten metal can be made uniform, and it is possible to achieve an excellent effect of improving the yield by eliminating the thickness unevenness of the steel sheet that is solidified and manufactured from the molten metal.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 and FIG. 2 are examples of embodiments for carrying out the present invention, and a pair of cooling rolls 1 disposed at a required interval in the horizontal direction, and a pair of side weirs 2 attached to the cooling roll 1. , A molten metal supply nozzle 3 disposed so as to be positioned right above the roll gap G, and a cooling roll abrading device 4 for removing oxide adhering to the outer peripheral surface of the cooling roll 1.

  The cooling roll 1 is configured such that cooling water circulates therein and the roll gap G can be adjusted in accordance with the thickness of the steel strip S to be produced.

  The rotation direction and speed of the cooling roll 1 are set so that the outer peripheral surface of each cooling roll 1 moves from the upper side toward the roll gap G at a constant speed.

  When molten metal is poured from a ladle (not shown) to the molten metal supply nozzle 3 and the molten metal is supplied to the space surrounded by the cooling roll 1 and the side weir 2, a molten metal reservoir 5 is formed, and the cooling roll 1 is moved by the circulation of the cooling water. When rotating while removing heat, the molten metal is solidified on the outer peripheral surface of the cooling roll 1, the solidified shell formed on the outer peripheral surface of each cooling roll 1 is bonded, and the steel strip S is sent out below the roll gap G. At this time, the steel strips S are pressed against shaft boxes (not shown) pivotally supporting the neck portions of the respective cooling rolls 1 so as to be close to each other so that the thickness of the steel strip S becomes a target value. Power is to be given.

  Then, the cooling roll abrading device 4 implants a brush piece 7 on a rotatable roll body member 6 arranged in parallel with the cooling roll 1 so as to contact the outer peripheral surface of the cooling roll 1. In addition, a brush roll 9 in which a non-flocked portion 8 (see FIG. 2) is formed as a non-flocked space at a position near the circumferential direction of the brush piece 7 in the roll body member 6, and the outer periphery of the cooling roll 1 A rotation driving means 10 such as a motor for rotating the brush roll 9 so that the moving direction of the brush piece 7 in contact with the surface is opposite to the moving direction of the outer peripheral surface of the cooling roll 1; It has the structure provided with the press means 11 urged | biased in the direction pressed against the cooling roll 1.

  In the case of this illustrated example, as shown in FIG. 2, the non-flocked portion 8 is formed by arranging a plurality of strips of the brush pieces 7 of the brush roll 9 in a spiral shape.

  The brush pieces 7 of the brush roll 9 may be arranged in a spiral manner, or may be arranged in a plurality of rows extending linearly obliquely with respect to the axis of the roll body member 6. Is possible.

  Further, as shown in FIG. 1, the pressing means 11 includes a shaft box 12 that rotatably supports the brush roll 9, and a swingable arrangement around a pin 13 that extends parallel to the axis of the brush roll 9. In addition, a fluid pressure cylinder 14 is provided that can bias the brush roll 9 against the cooling roll 1 by swinging the axle box 12 around the pin 13 toward the cooling roll 1 side. It has a configuration.

  Next, the operation of the illustrated example will be described.

  While rotating the brush roll 9 by the rotation driving means 10 so that the moving direction of the brush piece 7 is in contact with the outer peripheral surface of the cooling roll 1 is opposite to the moving direction of the outer peripheral surface of the cooling roll 1, the brush roll 9 When 9 is pressed against the cooling roll 1 by the pressing means 11, the axial shape of the outer peripheral surface of the cooling roll 1 to which the crown is applied in accordance with the desired steel plate thickness profile is subjected to a heat load during casting and is heated to a high temperature. Even if it has a complicated shape due to thermal stress in the state, the non-flocked portion 8 is formed on the brush roll 9 as a non-flocked space in the vicinity of the circumferential direction of the brush piece 7 in the roll barrel member 6. Therefore, unlike the densely flocked type brush roll 9 having high rigidity, the elastic deformation of each hair forming the brush piece 7 is sufficiently utilized, and the cooling low Therefore, the outer peripheral surface of the cooling roll 1 having a complicated profile can be uniformly polished, and the oxide layer has uneven thickness on the outer peripheral surface of the cooling roll 1. In addition, the heat removal from the molten metal is uniform on the outer peripheral surface of the cooling roll 1 that is responsible for solidification by removing a large amount of heat from the molten metal, and the thickness unevenness of the solidified and manufactured steel sheet is less likely to occur. Thus, the yield can be improved.

Here, FIG. 3 shows a brush roll 9 (with a spiral angle of 30 ° with respect to the axis and 16 streaks) and a conventional flocking type brush roll 9 ′ according to an example of an embodiment of the present invention. ,
Brush roll outer diameter: φ250 [mm]
Roll body member outer diameter: φ160 [mm]
Brush roll effective width: 500 [mm]
Brush body material: Polypropylene Brush body diameter: φ0.5 [mm]
Press load: 150 to 300 [N]
Rotation speed: 1500 [rpm]
Pressing time: 4-5 [sec]
FIG. 2 is a schematic diagram showing a test apparatus for measuring a pressure distribution when the pressure receiving plate 15 is placed in an inclined arrangement (tan θ = 1/500) under the condition: Is attached with a pressure-sensitive film 16 (width 300 [mm], height 40 [mm]) capable of measuring pressure distribution.

  Using the test apparatus shown in FIG. 3, the image analysis of the pressure-sensitive film 16 colored by applying pressure by the brush rolls 9, 9 ′ was performed, and the test results converted into pressure data are as shown in the diagram of FIG. Became.

  That is, as is apparent from the diagram shown in FIG. 4, the pressure level of the spiral brush roll 9 of the present invention is higher than that of the densely-implanted brush roll 9 '. Since the number of hairs that can contact the pressure receiving surface of the pressure receiving plate 15 at the same time instantly decreases with the spirally wound brush roll 9 of the present invention compared to the densely implanted hair type brush roll 9 ', considering the flocked state, Even if the pressing load is the same, the load acting on each of the hairs at a certain moment is higher in the spiral brush roll 9 of the present invention than in the dense flock type brush roll 9 '. It is thought that this is because it becomes larger and appears as an increase in pressure in the macro. Further, although the influence of the inclined contact appears clearly in the densely flocked type brush roll 9 ′, it is clear from the diagram of FIG. 4 that the influence is hardly seen in the spiral brush roll 9 of the present invention. The surface of the cooling roll 1 in an actual twin-roll type continuous casting apparatus is expected to have a complex curved shape due to the superposition of the initial crown and thermal deformation. It can be said that the brush roll 9 is expected to have good polishing performance against such a change in the surface profile of the cooling roll 1.

On the other hand, FIG. 5 shows a brush roll 9 in an example of an embodiment of the present invention and a conventional densely-flocked type brush roll 9, respectively, as described above.
Brush roll outer diameter: φ250 [mm]
Roll body member outer diameter: φ160 [mm]
Brush roll effective width: 500 [mm]
Brush body material: Polypropylene Brush body diameter: φ0.5 [mm]
Press load: 150 to 300 [N]
Rotation speed: 1500 [rpm]
Pressing time: 4-5 [sec]
Resin so that a linear recess 17 (width 3 or 5 [mm], depth 0.2 [mm]) is formed on the surface in a direction perpendicular to the axis of the brush rolls 9 and 9 ′. FIG. 2 is a schematic diagram showing a test apparatus for measuring a pressure distribution when a pressure is applied to a pressure receiving plate 15 to which a film 18 (thickness 0.2 [mm]) is attached; Is attached with a pressure sensitive film 16 (width 300 [mm], height 40 [mm]) capable of measuring pressure distribution so as to cover the resin film 18.

  As is apparent from the diagram shown in FIG. 6, the pressure level of the spiral brush roll 9 of the present invention is higher than that of the dense flocking type brush roll 9 '. Similarly, the number of hairs that can simultaneously contact the pressure-receiving surface of the pressure-receiving plate 15 at a certain moment is smaller in the spiral brush roll 9 of the present invention than in the densely-flocked type brush roll 9 'considering the flocked state. Therefore, even if it is the same pressing load, the load acting on each hair body at a certain moment is a spiral brush roll of the present invention as compared with the densely-planted brush roll 9 '. It is thought that 9 is larger and appears in the macro as an increase in pressure.

  Then, when the pressure fluctuation coefficient (= standard deviation / average pressure × 100 [%]), which is an index of pressure variation, is obtained based on the test result, the pressure receiving plate 15 that is inclined (tan θ = 1/500) is obtained. When the brush rolls 9 and 9 'are brought into contact with each other (see FIG. 3), and the surface is formed with a linear depression 17 (width 3 or 5 [mm], depth in a direction perpendicular to the axis of the brush rolls 9 and 9'. When the brush rolls 9 and 9 'are brought into contact with the pressure receiving plate 15 on which the resin film 18 (thickness 0.2 [mm]) is attached so that 0.2 [mm] is formed (see FIG. 5). In any of the above, as shown in FIG. 7, the pressure fluctuation coefficient of the spiral brush roll 9 of the present invention is smaller than that of the dense flocking type brush roll 9 ′, and the spatial fluctuation of pressure is small. I understand that.

  Thus, by using the cooling roll abrading device 4 as shown in FIG. 1 and FIG. 2, it is possible to reliably scrape the oxide deposited on the outer peripheral surface over the entire effective width of the cooling roll 1. The heat removal from the molten metal on the outer peripheral surface of 1 can be made uniform, and the unevenness of the thickness of the steel sheet solidified and manufactured from the molten metal can be eliminated to improve the yield.

  It should be noted that the cooling roll polishing apparatus of the twin roll type continuous casting apparatus of the present invention is not limited to the above illustrated example, and various modifications can be made without departing from the scope of the present invention. It is.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole schematic block diagram which shows an example of the form which implements this invention. It is a perspective view which shows the brush roll in an example of embodiment which implements this invention. A test for measuring the pressure distribution when the brush roll according to an embodiment of the present invention and a conventional densely-flocked type brush roll are brought into contact with a pressure receiving plate arranged in an inclined manner under required conditions. It is the schematic which shows an apparatus. It is a diagram which shows the test result by the test apparatus shown in FIG. In the pressure receiving plate which stuck the resin film so that a linear hollow may be formed in the surface under the required conditions, respectively, the brush roll in an example of carrying out the present invention and the conventional densely flocked type brush roll It is the schematic which shows the test apparatus for measuring the pressure distribution at the time of making it contact. It is a diagram which shows the test result by the test apparatus shown in FIG. 6 is a bar graph showing a comparison result of pressure fluctuation coefficients obtained based on a test result obtained by the test apparatus shown in FIG. 3 and a comparison result of pressure fluctuation coefficients based on a test result of the test apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling roll 4 Cooling roll abrading device 6 Roll body member 7 Brush piece 8 Non-flocking part 9 Brush roll 10 Rotation drive means 11 Pressing means 12 Shaft box 13 Pin 14 Fluid pressure cylinder G Roll gap S Steel strip

Claims (2)

In the cooling roll scouring device of a twin roll type continuous casting apparatus that supplies molten metal between a pair of cooling rolls arranged at a required interval in the horizontal direction and sends the solidified metal as a strip-shaped thin plate,
A rotatable roll body member disposed in parallel with the cooling roll having a crown provided on an outer peripheral surface; and a brush piece planted on the roll body member so as to contact the outer peripheral surface of the cooling roll; By forming the space on the roll body member as a space that is not implanted in the vicinity of the brush piece in the circumferential direction , each brush piece can be sufficiently elastically deformed to adapt to the outer peripheral surface of the cooling roll, and the cooling roll is uniform. A brush roll having a non-flocked portion , which enables smooth polishing ;
Rotation drive means for rotating the brush roll so that its moving direction is opposite to the moving direction of the outer peripheral surface of the cooling roll at the contact portion of the brush piece with the outer peripheral surface of the cooling roll;
And a pressing means for biasing the brush roll in a direction in which the brush roll is pressed against the cooling roll.   The cooling roll scouring device for a twin-roll continuous casting apparatus according to claim 1, wherein the non-planted portion is formed by arranging brush pieces of the brush roll in a spiral shape.

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