WO2014178369A1 - 連続鋳造設備 - Google Patents
連続鋳造設備 Download PDFInfo
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- WO2014178369A1 WO2014178369A1 PCT/JP2014/061845 JP2014061845W WO2014178369A1 WO 2014178369 A1 WO2014178369 A1 WO 2014178369A1 JP 2014061845 W JP2014061845 W JP 2014061845W WO 2014178369 A1 WO2014178369 A1 WO 2014178369A1
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- WIPO (PCT)
- Prior art keywords
- slab
- roll
- cast slab
- recess
- diameter portion
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1282—Vertical casting and curving the cast stock to the horizontal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/22—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for rolling metal immediately subsequent to continuous casting, i.e. in-line rolling of steel
Definitions
- the present invention relates to a continuous casting facility comprising a slab squeezing device that squeezes a slab and a slab squeezing device that is disposed on the rear stage side of the slab squeezing device and sandwiches and squeezes the slab. is there.
- This application claims priority based on Japanese Patent Application No. 2013-096809 for which it applied to Japan on May 2, 2013, and uses the content here.
- the molten steel injected into the mold is cooled by the cooling means, so that the solidified shell grows and the slab is pulled out from below the mold.
- the slab pulled out from the mold is not completely solidified when it comes out of the mold, and has an unsolidified portion inside.
- template Due to this bulging deformation, internal defects such as center segregation and porosity may occur in the central portion in the width direction of the slab where the unsolidified portion exists.
- Patent Documents 1 and 2 In order to suppress internal defects such as center segregation and porosity due to the above-mentioned bulging deformation, as described in Patent Documents 1 and 2, for example, a slab reduction device that presses a long side surface of a slab drawn from a mold is used. Proposed continuous casting equipment has been proposed.
- the slab reduction roll that comes into contact with the slab is a divided roll that is divided in the axial direction, and between the divided rolls that are adjacent in the axial direction.
- the bearing portion is arranged.
- Patent Documents 3, 4, and 5 propose a method and an apparatus for rolling down a slab using a slab rolling roll having a large-diameter portion protruding radially outward at the axial center portion. .
- a slab drawing device having a slab drawing roll for holding and squeezing a slab on the rear side of the slab squeezing device that presses the long side surface of the slab. Be placed.
- Patent Documents 3, 4, and 5 when a part of the long side surface of the slab is squeezed using the slab pressing roll having the above-described large diameter portion, Is formed with a recess corresponding to the large diameter portion.
- the slab drawing roll and the region where the recess is formed do not come into contact with each other, and the contact area between the slab drawing roll and the slab becomes small. For this reason, there is a problem that the slab drawing roll is unevenly worn and the life of the roll is shortened. Further, the drawing force of the slab is insufficient, and there is a possibility that the casting cannot be stably performed.
- the slab drawing roll is a divided roll obtained by dividing the slab drawing roll in the axial direction. Even in this case, since the slab is sandwiched only by the split rolls corresponding to the regions other than the recesses, there is a possibility that a part of the split rolls is worn. Further, since all loads are applied to the bearing portion of the split roll that holds the slab, this bearing portion may be damaged early.
- the present invention has been made in view of the above-described situation, and even a cast slab in which a concave portion is formed on a long side surface by being squeezed by a slab squeezing device is securely sandwiched and pulled out. It is an object of the present invention to provide a continuous casting facility that includes a slab drawing device that can perform casting, can extend the roll life of the slab drawing roll, and can stably perform casting.
- a continuous casting facility includes a slab squeezing device that squeezes a slab, and a slab that is disposed on a rear side of the slab squeezing device and sandwiches and pulls out the slab.
- a continuous casting facility comprising a drawing device,
- the slab reduction device has a pair of slab reduction rolls that sandwich and press the slab, and at least one of the slab reduction rolls that are paired with the slab interposed therebetween is at an axially central portion.
- the slab that has been squeezed by the slab squeezing device has a recess corresponding to the large diameter portion
- the slab drawing device has a pair of slab drawing rolls that sandwich the slab, and at least one slab drawing roll of the pair of slab drawing rolls is in contact with and supported by the recess.
- the axial length L 2 of the recess support portion, relative to the axial length L 1 of the larger diameter portion forming the recess, is in the range of 0.5 ⁇ L 1 ⁇ L 2 ⁇ L 1 ing.
- the slab drawing device has a pair of slab drawing rolls that sandwich the slab, and at least one slab drawing roll of the pair of slab drawing rolls is a casting slab.
- a recess support portion for supporting in contact with the recess formed on the long side surfaces of the support, and is driven by a drive mechanism, the large-diameter axial length L 2 of the recess support portion, which forms the recess the axial direction length L 1 of the parts, because it is in the range of 0.5 ⁇ L 1 ⁇ L 2 ⁇ L 1, even cast piece having a recess formed, the concave portion and the cast strip withdrawing A sufficient contact area with the roll can be secured.
- the slab drawing roll is usually provided with an elevating device such as a hydraulic cylinder, and can be set at a position where the recess support portion contacts the recess of the slab.
- the slab rolling roll has a small diameter portion extending at both ends of the large diameter portion in the slab width direction, and the slab drawing roll is supported by the concave portion.
- the difference H between the radius of the large-diameter portion and the radius of the small-diameter portion of the slab pressing roll, and the slab drawing roll It is preferable that the relationship between the difference H ′ between the radius of the concave portion support portion and the radius of the small diameter portion is H ⁇ H ′.
- the radius of the concave portion support portion and the radius of the small diameter portion of the slab drawing roll If the difference H ′ satisfies H ⁇ H ′, the concave portion supporting portion and the concave portion are surely brought into contact with each other, and the slab can be securely held and pulled out by the slab pulling roll.
- the slab drawing roll may be a divided roll divided in the axial direction, and the plurality of divided rolls may be provided with the recessed portion support portion.
- the slab drawing roll is a split roll divided in the axial direction, the load applied to one split roll can be reduced, and the slab drawing apparatus can be downsized. . Further, the load can be received by the plurality of bearing portions, and the life of the bearing portions can be extended.
- a slab drawing device that can securely pinch and pull out even a slab in which a concave portion is formed on the long side surface by being squeezed by a slab squeezing device. It is possible to provide a continuous casting facility capable of stably performing casting by extending the roll life of the slab drawing roll as compared with the prior art.
- a continuous casting facility 10 shown in FIG. 1 presses the slab 1 in the thickness direction, and a slab support roll group 20 including a water-cooled mold 11 and a plurality of slab support rolls 21 positioned below the water-cooled mold 11.
- a slab squeezing device 30 and a slab drawing device 50 for holding the slab 1 and drawing it in the drawing direction Z are provided.
- a vertical band 14 that pulls the slab 1 drawn out from the water-cooled mold 11 downward, a curved band 15 that curves the slab 1, and a curved slab. 1 is a vertical bending type continuous casting machine having a straightening band 16 for bending back 1 and a horizontal band 17 for conveying the cast piece 1 in the horizontal direction.
- the water-cooled mold 11 has a cylindrical shape having a rectangular hole, and the slab 1 having a cross section matching the shape of the rectangular hole is pulled out.
- the long side length of the rectangular hole (corresponding to the width of the cast piece 1) is 900 to 2300 mm
- the short side length of the rectangular hole (corresponding to the thickness of the cast piece 1) is 150 to 400 mm.
- the water-cooled mold 11 is provided with a primary cooling means (not shown) for cooling the molten steel in the rectangular hole.
- the slab support roll group 20 is located in the pinch roll part 24 located in the vertical band 14, the bending roll part 25 located in the curved band 15, the straightening roll part 26 located in the straightening band 16, and the horizontal band 17.
- the slab support roll 21 constituting the slab support roll group 20 extends in the width direction of the slab 1 and is configured to support the long side surface of the slab 1.
- cooling water is jetted toward the long side surface of the slab 1 as a secondary cooling means.
- a spray nozzle (not shown) is provided.
- the slab reduction device 30 is for squeezing the slab 1 drawn out from the water-cooled mold 11 in the thickness direction.
- the slab 1 has a central solid phase ratio of 0.2 or more. It is arranged in the horizontal belt 17 so as to reduce the pressure.
- the slab reduction device 30 may be disposed in any of the above-described vertical band 14, curved band 15, and correction band 16.
- the slab reduction device 30 is disposed on the slab reduction roll 31 that contacts the long side surface of the slab 1 and one long side surface side (upper side in FIG. 2) of the slab 1.
- the first frame 38 and the second frame 39 disposed on the other long side surface side (the lower side in FIG. 2) of the slab 1 are provided.
- a first slab pressure roll 31 a that contacts one long side surface of the slab 1 is pivotally supported on the first frame 38 via a bearing portion 34, and the second frame 39 includes a slab 1 of the slab 1.
- a second slab reduction roll 31b that is in contact with the other long side surface is pivotally supported via a bearing portion.
- the first slab pressing roll 31a supported by the first frame 38 and supported by the first frame 38 so as to be rotatable is supported by the first frame 38.
- the second slab reduction roll 31b pivotally supported by the second frame 39 has the same diameter in the axial direction.
- the first slab pressure roll 31a presses the central region in the width direction of the slab 1 where the large diameter portion 32 is located, and the width direction end region of the slab 1 where the small diameter portion 33 is located. It is set as the structure which does not press.
- the slab 1 pressed by the slab reducing device 30 having such a configuration has a concave portion 5 corresponding to the large diameter portion 32 on one long side surface.
- the slab width direction length W 1 of the recess 5 is configured to have a relationship of W 1 > (W 0 ⁇ W 1 ) with respect to the width direction length W 0 of the slab 1. Yes. That is, the slab width direction length W 1 of the recess 5 is longer than the slab width direction length (W 0 -W 1 ) of the region where the recess is not formed.
- the slab drawing apparatus 50 As shown in FIG. 1, the slab drawing device 50 is disposed on the rear stage side of the slab reducing device 30. As described above, the slab drawing device 30 has the concave portion 5 on one long side surface. The formed slab 1 is sandwiched and pulled out. As shown in FIG. 3, the slab drawing apparatus 50 includes a pair of slab drawing rolls 51 (a first slab drawing roll 51 a and a second slab drawing roll 51 b) that sandwich the slab 1. One slab drawing roll 51 a is configured to contact one long side surface of the slab 1, and the second slab drawing roll 15 b is configured to contact the other long side surface of the slab 1. The first slab drawing roll 51 a and the second slab drawing roll 51 b are each supported by a bearing 54.
- the first slab drawing roll 51a has a recess support 52 that protrudes radially outward and supports the recess 5 formed in the slab 1, and both ends of the recess support 52. And a small-diameter portion 53 positioned at each of the positions. Then, the axial length L 2 of the recess supporting portion 52, with respect to the axial length L 1 of the larger diameter portion 32 of the first slab pressure roll 31a, 0.5 ⁇ L 1 ⁇ L 2 ⁇ L It is comprised so that it may become in the range of 1 .
- the contact length W 2 between the concave portion supporting portion 52 and the concave portion 5 is (W 0 -W 1) with respect to the width direction length W 0 of the slab 1 and the slab width direction length W 1 of the concave portion 5. ) ⁇ W 2 ⁇ W 1 .
- the second slab drawing roll 51b in contact with the other long side surface of the slab 1 has the same diameter in the axial direction.
- the first slab drawing roll 51a having the recess support portion 52 is connected to a drive mechanism 62 such as a motor via a drive transmission mechanism 61 such as a universal joint. It is driven by the drive mechanism 62. That is, the first slab drawing roll 51 a is given a rotational driving force in the drawing direction by the operation of the drive mechanism 62.
- the second slab drawing roll 51b may also be driven in the drawing direction by a drive mechanism.
- a slab pressing device 30 and a slab drawing device 50 are disposed on the horizontal band 17.
- the difference H (see FIG. 2) between the radius of the large diameter portion 32 and the radius of the small diameter portion 33 of the first slab rolling roll 31a and the concave portion support portion of the first slab drawing roll 51a.
- the relationship between the difference H ′ (see FIG. 3) between the radius of 52 and the radius of the small-diameter portion 53 is H ⁇ H ′.
- the slab 1 drawn out from the water-cooled mold 11 is squeezed by the slab squeezing device 30 according to the present embodiment, for example, in a region where the central solid phase ratio is 0.2 or more.
- the slab 1 squeezed by the slab squeezing device 30 is sandwiched by the slab drawing device 50 and drawn in the drawing direction Z. Thereby, the slab 1 is manufactured continuously.
- the slab drawing device 50 includes a pair of slab drawing rolls 51 (a first slab drawing roll 51a and a first slab drawing roll 51a and a first slab drawing roll 51).
- the first slab drawing roll 51a is provided with a recess support portion 52 that contacts and supports the recess 5 formed on the long side surface of the slab 1.
- the axial length L 2 of the recess supporting portion 52 with respect to the axial length L 1 of the larger diameter portion 32 forming the recess 5, and in the range of 0.5 ⁇ L 1 ⁇ L 2 ⁇ L 1 Therefore, the contact area of the 1st slab drawing roll 51a and the recessed part 5 is securable. Thereby, the partial wear of the slab drawing roll 51 can be suppressed, and the lifetime of the slab drawing roll 51 can be extended. Moreover, casting can be carried out stably without the pulling force of the slab 1 being insufficient.
- the difference H between the radius of the large diameter portion 32 and the radius of the small diameter portion 33 of the first slab pressing roll 31a, and the radius and small diameter of the recess support portion 52 of the first slab drawing roll 51a Since the relationship with the difference H ′ with respect to the radius of the portion 53 is H ⁇ H ′, the concave portion 5 formed by the large diameter portion 32 and the concave portion support portion 52 can be reliably brought into contact with each other. The slab 1 can be securely held by the roll 51.
- the contact length W 2 between the recessed portion support portion 52 and the recessed portion 5 is the width direction length W 0 of the slab 1 and the slab width direction length of the recessed portion 5 formed by the large diameter portion 32. Since it is configured so that (W 0 -W 1 ) ⁇ W 2 ⁇ W 1 with respect to the length W 1, a sufficient contact area between the slab 1 and the slab drawing roll 51 is ensured. It becomes possible to do.
- the first slab reduction roll 31a of the slab reduction device 30 has a large-diameter portion 32 projecting radially outward at an axial center portion thereof, and a small-diameter portion extending at both ends of the large-diameter portion 32.
- the slab pressure roll 31 presses the central region in the width direction of the slab 1 where the large-diameter portion 32 is located, and the end region in the width direction of the slab 1 where the small-diameter portion 33 is located. Since it is set as the structure which does not press, it becomes possible to roll down only the width direction center area
- the central solid fraction can be defined as the solid fraction of the molten portion in the center of the slab thickness direction and in the slab width direction.
- the central solid fraction can be obtained by heat transfer / solidification calculation.
- an enthalpy method or an equivalent specific heat method is widely known, and any method may be used.
- the following equation is widely known, and this equation may be used.
- Central solid fraction (liquidus temperature-melt temperature) / (liquidus temperature-solidus temperature)
- the melting part temperature means the temperature of the melting part in the center part in the slab thickness direction and in the slab width direction, and can be obtained by heat transfer / solidification calculation.
- the liquidus temperature refer to, for example, “Akane and Steel, Nippon Steel Association, Vol.
- the temperature can be calculated with reference to, for example, “Hirai, Kanamaru, Mori; Gakken 19 Committee, Fifth Solidification Phenomenon Council Material, Solidification 46 (December 1968)”.
- the continuous casting installation which is embodiment of this invention was demonstrated, this invention is not limited to this, In the range which does not deviate from the technical idea of the invention, it can change suitably.
- the vertical bending type continuous casting machine has been described as an example as shown in FIG. 1, but the present invention is not limited to this, and a curved continuous casting machine, a vertical continuous casting machine, etc. You may apply to the continuous casting equipment of another system.
- the vertical continuous casting machine since it is necessary to securely hold and hold the slab by the slab drawing device, it is particularly effective to apply the present invention.
- the slab drawing roll 151 of the slab drawing apparatus 150 as a division
- the single drawing roll 151a and the second slab drawing roll 151b may each have a split roll configuration. In this case, it is preferable to provide the recessed part support part 152 which contacts the recessed part 5 of the slab 1 in several division
- the contact length W 2 (the sum of W 21 , W 22 , and W 23 in FIG. 4) between the concave portion supporting portion 152 and the concave portion 5 of each split roll is (W 0 ⁇ W 1 ) ⁇ (W 21 + W 22 + W 23 ) ⁇ W 1 is preferable.
- the first slab drawing roll 151a having the recess support portion 152 is connected to a drive mechanism 62 such as a motor through a drive transmission mechanism 61 such as a universal joint. And is driven by the drive mechanism 62. That is, the first slab drawing roll 151 a is given a rotational driving force in the drawing direction by the operation of the drive mechanism 62.
- the second slab drawing roll 51b may also be driven in the drawing direction by a drive mechanism.
- the load applied to one split roll can be reduced.
- the size of the single drawing device 150 can be reduced.
- a load can be received by the plurality of bearing portions 154, and the life of the bearing portion 154 can be extended.
- the first slab reduction roll has been described as having a large diameter portion.
- the present invention is not limited to this, and the first slab reduction roll and the second slab are provided. You may provide a large diameter part in both of a reduction roll. In this case, it is preferable that the slab drawing device is provided with a recess support portion on both the first slab drawing roll and the second slab drawing roll.
- the axial length L 1 of the larger diameter portion of the slab rolling device was 1900 mm.
- the width direction length of slab was 2200 mm, and the slab width direction length of the recessed part formed in the slab by the slab reduction apparatus was also 1900 mm.
- the slab drawing roll was set to a position where the recess support portion was in contact with the slab recess by an elevating device.
- the slab drawing roll of the slab drawing device has a constant diameter in the axial direction and does not contact the recess.
- a slab drawing roll of the slab drawing device is provided with a recess support portion, and the axial length L 2 of this recess support portion is 1805 mm (ie 0.95 ⁇ L 1 ). did.
- a recess support portion was provided on the slab drawing roll of the slab extraction device, and the axial length L 2 of the recess support portion was 1330 mm (ie, 0.70 ⁇ L 1 ).
- the invention sample 3 the concave support portions provided on the cast strip withdrawing roll cast strip withdrawing apparatus, the axial length L 2 of the recess support part 950 mm (i.e., 0.50 ⁇ L 1) was.
- the time for the slab drawing roll of the slab drawing device to be reduced to a predetermined diameter that requires replacement due to wear was evaluated.
- the evaluation results are shown in Table 1.
- Table 1 the results of relative evaluation with the time in the comparative example as 1, are shown.
- Inventive Example 1 has a life that is about 6 times longer than that of the Comparative Example.
- the example 2 of the present invention was about 4.5 times longer in life than the comparative example.
- Example 3 of the present invention was about three times as long as the comparative example. From the above, according to the example of the present invention, it was confirmed that the wear of the slab drawing roll was suppressed and casting could be carried out stably.
- the axial length L 2 of the recessed portion support portion said forming the recess with respect to the axial length L 1 of the larger diameter portion, if 0.5 times or more, sufficient cast It was found that the wear of the single drawing roll was suppressed. Further, if analogy from the results of these, the axial length L 2 of the recessed portion support portion, to the axial length L 1 of the large diameter portion to form a recess, even 0.4 times for example, cast It is considered that the wear of the single drawing roll is suppressed.
- the axial length L 2 of the recessed portion support portion to the axial length L 1 of the larger diameter portion forming the recess, it is preferable to secure more than 0.5 times. Further, 0.70 ⁇ L 1 is more preferable, and 0.80 ⁇ L 1 is even more preferable.
Abstract
Description
本願は、2013年5月2日に日本国に出願された特願2013-096809号に基づき、優先権を主張し、その内容をここに援用する。
そこで、例えば特許文献3、4、5には、軸方向中央部に径方向外方へ突出した大径部を有する鋳片圧下ロールを用いて鋳片を圧下する方法、装置が提案されている。
ここで、特許文献3、4、5に示すように、上述の大径部を有する鋳片圧下ロールを用いて鋳片の長辺面の一部を圧下した場合、鋳片の長辺面には前記大径部に対応した凹部が形成される。凹部が形成された鋳片を鋳片引抜装置において挟持した場合、鋳片引抜ロールと凹部が形成された領域とが接触しなくなり、鋳片引抜ロールと鋳片との接触面積が小さくなる。このため、鋳片引抜ロールが偏摩耗し、ロール寿命が短くなるといった問題があった。また、鋳片の引抜力が不足してしまい、鋳造を安定して実施できなくなるおそれがあった。
前記鋳片圧下装置は、前記鋳片を挟持して押圧する一対の鋳片圧下ロールを有し、前記鋳片を挟んで対になる前記鋳片圧下ロールの少なくとも一方は、軸方向中央部に径方向外方へ突出し、前記鋳片の幅方向中央部を押圧する大径部を備えており、
前記鋳片圧下装置によって圧下された前記鋳片は、前記大径部に対応する凹部が形成されており、
前記鋳片引抜装置は、前記鋳片を挟持する一対の鋳片引抜ロールを有し、当該一対の鋳片引抜ロールのうち少なくとも一方の鋳片引抜ロールは、前記凹部と接触して支持する凹部支持部を備えており、かつ駆動機構によって駆動され、
前記凹部支持部の軸方向長さL2が、前記凹部を形成する前記大径部の軸方向長さL1に対して、0.5×L1≦L2<L1の範囲内とされている。
なお、鋳片引抜ロールは、通常、油圧シリンダ等の昇降装置を備えており、凹部支持部が鋳片の凹部に接触する位置に設定することができる。
この場合、凹部の深さは鋳片圧下ロールの大径部の半径と小径部の半径の差分Hより大きくなることはないので、鋳片引抜ロールの前記凹部支持部の半径と小径部の半径の差分H´が、H≦H´を満たせば、凹部支持部と凹部とが確実に接触することになり、鋳片引抜ロールによって鋳片を確実に挟持して引き抜くことができる。
また、この水冷鋳型11には、矩形孔内の溶鋼を冷却するための1次冷却手段(図示なし)が備えられている。
ここで、鋳片支持ロール群20を構成する鋳片支持ロール21は、鋳片1の幅方向に延在しており、鋳片1の長辺面を支持する構成とされている。
また、鋳片1の引抜方向Zに間隔を開けて配列された複数の鋳片支持ロール21の間には、2次冷却手段として、鋳片1の長辺面に向けて冷却水を噴出するスプレーノズル(図示なし)が配設されている。
第1フレーム38には、鋳片1の一方の長辺面に接触する第1鋳片圧下ロール31aが軸受部34を介して軸支されており、第2フレーム39には、鋳片1の他方の長辺面に接触する第2鋳片圧下ロール31bが軸受部34を介して軸支されている。
一方、第2フレーム39に軸支された第2鋳片圧下ロール31bは、軸方向で同一の径となっている。
このような構成の鋳片圧下装置30によって押圧された鋳片1は、図3に示すように、一方の長辺面に大径部32に対応する凹部5が形成されている。ここで、凹部5の鋳片幅方向長さW1は、鋳片1の幅方向長さW0に対して、W1>(W0-W1)との関係となるように構成されている。すなわち、凹部5の鋳片幅方向長さW1が、凹部が形成されていない領域の鋳片幅方向長さ(W0-W1)よりも長くされている。
鋳片引抜装置50は、図3に示すように、鋳片1を挟持する一対の鋳片引抜ロール51(第1鋳片引抜ロール51a及び第2鋳片引抜ロール51b)を備えており、第1鋳片引抜ロール51aが鋳片1の一方の長辺面に接触し、第2鋳片引抜ロール15bが鋳片1の他方の長辺面に接触するように構成されている。これら第1鋳片引抜ロール51a及び第2鋳片引抜ロール51bは、それぞれ軸受部54によって軸支されている。
そして、この凹部支持部52の軸方向長さL2が、第1鋳片圧下ロール31aの大径部32の軸方向長さL1に対して、0.5×L1≦L2<L1の範囲内となるように構成されている。また、凹部支持部52と凹部5との接触長さW2が、鋳片1の幅方向長さW0、凹部5の鋳片幅方向長さW1に対して、(W0-W1)<W2<W1の範囲内となるように構成されている。
一方、鋳片1の他方の長辺面に接触する第2鋳片引抜ロール51bは、軸方向で同一の径となっている。
また、本実施形態においては、第1鋳片圧下ロール31aの大径部32の半径と小径部33の半径との差分H(図2参照)と、第1鋳片引抜ロール51aの凹部支持部52の半径と小径部53の半径との差分H´(図3参照)との関係が、H≦H´とされている。
この鋳片1は、図1に示すように、ピンチロール部24によって下方に向けて引き抜かれるとともにベンディングロール部25によって湾曲させられる。そして、矯正ロール部26によって曲げ戻され、水平ロール部27によって水平方向に搬送されることになる。
そして、鋳片1が水平方向に引き出される水平帯17の後段側において、鋳片1が完全に凝固することになる。
そして、鋳片圧下装置30によって圧下された鋳片1は、鋳片引抜装置50によって挟持されて引抜方向Zに向けて引き抜かれる。これにより、鋳片1が連続的に製造される。
ちなみに、鋳片1の中心固相率が0.2以上では、中心偏析やポロシティの問題が発生することを実験的に知見しており、固相率が0.2以上の領域で圧下することにより、本発明の効果が顕著となることから、鋳片1の中心固相率が0.2以上の領域で圧下することが好ましい。一方、鋳片1の中心固相率の上限は、中心偏析やポロシティの問題が発生する領域であることから、1.0である。
また、中心固相率は、伝熱・凝固計算によって求めることができ、伝熱・凝固計算としては、エンタルピー法や等価比熱法などが広く知られており、いずれの方法を用いてもよい。また、簡易的には、下記の式が広く知られており、この式を用いてもよい。
中心固相率=(液相線温度-溶融部温度)/(液相線温度-固相線温度)
ここで、溶融部温度とは、鋳片厚み方向の中心部で、かつ、鋳片幅方向の溶融部分の温度を意味しており、伝熱・凝固計算によって求めることができる。また、液相線温度は、例えば、「鐵と鋼、日本鐡鋼協會々誌、Vol.55、No.3(19690227)S85、社団法人日本鉄鋼協会」を参照して、また、固相線温度は、例えば、「平居、金丸、森;学振19委、第5回凝固現象協議会資料、凝固46(1968年12月)」を参照して、それぞれ算出することができる。
例えば、本実施形態では、図1に示すように垂直曲げ型連続鋳造機を例に挙げて説明したが、これに限定されることはなく、湾曲型連続鋳造機や垂直型連続鋳造機等の他の方式の連続鋳造設備に適用してもよい。ここで、垂直型連続鋳造機においては、鋳片引抜装置によって鋳片を確実に挟持して保持する必要があるため、本発明を適用することが特に効果的である。
この場合、複数の分割ロールに、鋳片1の凹部5と接触する凹部支持部152を設けることが好ましい。そして、各分割ロールの凹部支持部152の軸方向長さL2(図4においては、L21、L22、L23の合計)が、0.5×L1<(L21+L22+L23)<L1の範囲内とされていればよい。また、各分割ロールの凹部支持部152と凹部5との接触長さW2(図4においては、W21、W22、W23の合計)が、(W0-W1)<(W21+W22+W23)<W1の範囲内とされていることが好ましい。
実施形態において説明した鋳片圧下装置を備えた連続鋳造設備において、鋳片引抜装置の鋳片引抜ロールの形状を変更して鋳造を実施し、鋳片引抜ロールの摩耗量について評価した。
また、鋳片引抜ロールは昇降装置により、凹部支持部が鋳片凹部に接触する位置に設定した。さらに、鋳片圧下ロールの大径部の半径と小径部の半径との差分Hと、鋳片引抜ロールの凹部支持部の半径と小径部の半径との差分H´とは、H=H´のものを用いた。
比較例では、鋳片引抜装置の鋳片引抜ロールを、軸方向に径が一定であり、凹部と接触しない構成のものとした。
これに対し、本発明例1では、鋳片引抜装置の鋳片引抜ロールに凹部支持部を設け、この凹部支持部の軸方向長さL2を1805mm(すなわち、0.95×L1)とした。
一方、本発明例2では、鋳片引抜装置の鋳片引抜ロールに凹部支持部を設け、この凹部支持部の軸方向長さL2を1330mm(すなわち、0.70×L1)とした。
また本発明例3では、鋳片引抜装置の鋳片引抜ロールに凹部支持部を設け、この凹部支持部の軸方向長さL2を950mm(すなわち、0.50×L1)とした。
以上のことから、本発明例によれば、鋳片引抜ロールの摩耗を抑制し、鋳造を安定して実施できることが確認された。
30 鋳片圧下装置
31 鋳片圧下ロール
32 大径部
50 鋳片引抜装置
51 鋳片引抜ロール
52 凹部支持部
Claims (2)
- 鋳片を圧下する鋳片圧下装置と、この鋳片圧下装置の後段側に配置され、前記鋳片を挟持して引き抜く鋳片引抜装置と、を備えた連続鋳造設備であって、
前記鋳片圧下装置は、前記鋳片を挟持して押圧する一対の鋳片圧下ロールを有し、前記鋳片を挟んで対になる前記鋳片圧下ロールの少なくとも一方は、軸方向中央部に径方向外方へ突出し、前記鋳片の幅方向中央部を押圧する大径部を備えており、
前記鋳片圧下装置によって圧下された前記鋳片は、前記大径部に対応する凹部が形成されており、
前記鋳片引抜装置は、前記鋳片を挟持する一対の鋳片引抜ロールを有し、当該一対の鋳片引抜ロールのうち少なくとも一方の鋳片引抜ロールは、前記凹部と接触して支持する凹部支持部を備えており、かつ駆動機構によって駆動され、
前記凹部支持部の軸方向長さL2が、前記凹部を形成する前記大径部の軸方向長さL1に対して、0.5×L1≦L2<L1の範囲内とされている。 - 請求項1に記載の連続鋳造設備において、
前記鋳片圧下ロールは、前記大径部の鋳片幅方向の両端部に延在する小径部を有し、
前記鋳片引抜ロールは、前記凹部支持部の鋳片幅方向の両端部に延在する小径部を有しており、
前記鋳片圧下ロールの前記大径部の半径と前記小径部の半径との差分Hと、前記鋳片引抜ロールの前記凹部支持部の半径と前記小径部の半径との差分H´との関係が、H≦H´である。
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