WO2021157083A1 - Continuous casting mold - Google Patents

Continuous casting mold Download PDF

Info

Publication number
WO2021157083A1
WO2021157083A1 PCT/JP2020/004925 JP2020004925W WO2021157083A1 WO 2021157083 A1 WO2021157083 A1 WO 2021157083A1 JP 2020004925 W JP2020004925 W JP 2020004925W WO 2021157083 A1 WO2021157083 A1 WO 2021157083A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
mold space
pair
continuous casting
chamfer forming
Prior art date
Application number
PCT/JP2020/004925
Other languages
French (fr)
Japanese (ja)
Inventor
修 筒江
新一 平野
勝洋 小林
貴暉 大前
隆雄 野村
Original Assignee
三島光産株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三島光産株式会社 filed Critical 三島光産株式会社
Priority to JP2020521614A priority Critical patent/JP6817498B1/en
Priority to PCT/JP2020/004925 priority patent/WO2021157083A1/en
Publication of WO2021157083A1 publication Critical patent/WO2021157083A1/en

Links

Images

Classifications

    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/059—Mould materials or platings

Definitions

  • the present invention relates to a mold for continuous casting used for producing slabs.
  • a mold for continuous casting (hereinafter, also simply referred to as a mold) having a mold wall in which a mold space portion penetrating in the vertical direction is formed inside is used, and molten steel supplied to the mold space portion is used as a mold wall. It is solidified and cast while cooling with.
  • the cast slab is further conveyed downstream in the casting direction and cut into a slab, and the slab is rolled by a rolling mill.
  • the slab has a substantially quadrangular cross section, bending or cracking may occur at the widthwise end of the slab during rolling of the slab, which may lead to quality defects or a decrease in yield.
  • Patent Document 1 has a mold space portion surrounded by a pair of short sides arranged to face each other at intervals and a pair of long sides sandwiching the short sides from both sides in the width direction.
  • a chamfer forming portion having a triangular cross section is provided on the short sides of the four corner regions of the mold wall, which is composed of a pair of short sides and a pair of long sides and forms a mold space portion.
  • the template is disclosed.
  • the pair of short sides are clamped by a pair of long sides sandwiching the pair of short sides.
  • a wear-resistant film (plating film) is formed on the surface of the chamfer forming portion.
  • the short side expands thermally in the width direction with a maximum of about 80 mm below the meniscus (hot water surface) level, and 300 mm below this (particularly).
  • a relatively large thermal deformation occurred in the range up to about 200 mm).
  • a large stress is generated because the corner edge portion on the short side mold space side strongly contacts the surface on the long side mold space side.
  • chamfer forming portion having a triangular cross section for example, deformation, damage or chipping of the film, etc. occur at the acute-angled end portion on the side contacting the surface on the mold space side of the long side. It is easy to do, and there is a risk that the life of the mold will be shortened and the quality of the slab will be poor.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a mold for continuous casting, which can prolong the life of the slab and can produce slabs of good quality with good yield.
  • the continuous casting mold according to the first invention according to the above object is surrounded by a pair of short sides arranged to face each other at intervals and a pair of long sides sandwiching the short sides from both sides in the width direction. It has a mold space portion, is composed of the pair of short sides and the pair of long sides, and expands toward the mold space portion side on the short sides of the four corner regions of the mold wall forming the mold space portion.
  • a continuous casting mold which is provided with a chamfer forming portion to be ejected, molten steel is injected into the mold space, cooled, and drawn as a slab.
  • the surface of the chamfer forming portion on the mold space side is composed of a plurality of continuous straight portions formed so that the horizontal cross section bulges toward the mold space side, and the mold on the long side is formed.
  • the angle formed by the straight line portion in contact with or close to the long side with respect to the surface on the space portion side is more than 60 degrees and less than 90 degrees.
  • a wear-resistant film is formed on the surface of the chamfer forming portion on the mold space side.
  • the continuous casting mold according to the second invention according to the above object is surrounded by a pair of short sides arranged to face each other at intervals and a pair of long sides sandwiching the short sides from both sides in the width direction. It has a mold space portion, is composed of the pair of short sides and the pair of long sides, and expands toward the mold space portion side on the short sides of the four corner regions of the mold wall forming the mold space portion.
  • a continuous casting mold which is provided with a chamfer forming portion to be ejected, molten steel is injected into the mold space, cooled, and drawn as a slab.
  • the surface of the chamfer forming portion on the mold space side is composed of a plurality of continuous straight lines formed so that the horizontal cross section bulges toward the mold space side, and the plurality of straight lines.
  • the connecting portion formed on the straight portion that is in contact with or close to the long side is composed of a curved portion that bulges toward the mold space portion side.
  • a wear-resistant film is formed on the surface of the chamfer forming portion on the mold space side.
  • the continuous casting mold according to the third invention according to the above object is surrounded by a pair of short sides arranged to face each other at intervals and a pair of long sides sandwiching the short sides from both sides in the width direction. It has a mold space portion, is composed of the pair of short sides and the pair of long sides, and expands toward the mold space portion side on the short sides of the four corner regions of the mold wall forming the mold space portion.
  • a continuous casting mold which is provided with a chamfer forming portion to be ejected, molten steel is injected into the mold space, cooled, and drawn as a slab.
  • the surface of the chamfer forming portion on the mold space side is composed of a curved portion formed so that the horizontal cross section bulges toward the mold space side.
  • a wear-resistant film is formed on the surface of the chamfer forming portion on the mold space side.
  • the chamfer forming portion formed on the opposite short side follows the solidification shrinkage amount of the slab shell in the direction in which the slab is pulled out. It is preferable that an inclined portion is formed in which the interval is gradually narrowed.
  • the film is preferably a sprayed film or a plated film.
  • the mold for continuous casting according to the present invention is composed of a plurality of continuous straight portions or curved portions so that the surface of the chamfer forming portion on the mold space side bulges toward the mold space side in the horizontal cross section. Therefore, the shape of the end portion of the chamfer forming portion that contacts the surface of the long side on the mold space side can be made a gentler shape than the conventional sharp-angled shape. As a result, the rigidity of the end portion of the chamfer forming portion can be improved as compared with the conventional case. Further, by forming an wear-resistant film on the surface of the chamfer forming portion on the mold space side, damage or chipping of the film can be reduced as compared with the conventional case. Therefore, the life can be extended as compared with the conventional case, and slabs of good quality can be produced with good yield.
  • the continuous casting mold (hereinafter, also simply referred to as a mold) 10 has a pair of short sides 11 arranged to face each other at intervals and the short sides thereof.
  • Molten steel (not shown) is injected into the mold space 13 surrounded by a pair of long sides 12 sandwiching the sides 11 from both sides in the width direction, cooled, and pulled out as a slab. It is a mold that can produce slabs of good quality with good yield. The details will be described below.
  • Each of the pair of short sides 11 has a thickness of about 10 mm or more and 100 mm or less, a width of about 50 mm or more and 500 mm or less, and a length in the casting direction of about 600 mm or more and 1200 mm or less.
  • the pair of short sides 11 are plane-symmetrical and have the same configuration.
  • each of the pair of long sides 12 has a thickness of, for example, about 10 mm or more and 100 mm or less, and the distance between the pair of short sides 11 arranged to face each other (the width at which the long sides 12 come into contact with the slab) is in the range of 200 mm or more and 3500 mm or less. It has a width that can be changed with, and the length in the casting direction is about the same as the short side 11.
  • the pair of short sides 11 are clamped by a pair of long sides 12 sandwiching the short sides 11.
  • the short side 11 and the long side 12 described above are made of copper or a copper alloy, and an abrasion resistant film (not shown) is formed on each surface on the mold space 13 side thereof, and the short side 11 and the long side 12 are formed.
  • the back plate (not shown) that abuts and is fixed to each back surface of the above is made of stainless steel or steel.
  • the large number of water conveyance grooves are formed in the width direction of the short side 11 at a predetermined pitch (same pitch and / or different pitch) within a range of, for example, about 5 mm or more and 200 mm or less.
  • a large number of the above-mentioned water guide grooves are also provided on the back surface side of the long side 12 in the casting direction at a predetermined pitch in the width direction of the long side 12.
  • the mold wall 14 forming the mold space 13 is formed by the pair of short sides 11 and the pair of long sides 12 described above. As shown in FIG. 1, chamfer forming portions 15 that bulge toward the mold space portion 13 side are formed on the short sides 11 of the four corner regions R of the mold wall 14, respectively. In this way, the chamfer forming portions 15 are provided at both ends of the short sides 11 in order to make the distance between the pair of short sides 11 adjustable (the width of the slab that can be cast by one mold 10). This is to enable various changes).
  • the chamfer forming portions 15 formed in the four corner regions R of the mold wall 14 have the same shape, but may have different shapes within the range of the following conditions. That is, the chamfer forming portion 15 has a substantially triangular shape in a substantially cross-sectional shape, and the width X in the width direction of the short side 11 (hereinafter, also referred to as the short side direction) is the width direction of the long side 12 (hereinafter, also referred to as the short side direction).
  • the width (also described as the long side direction) is longer than the width (protruding width to the mold space portion 13) Y (that is, the chamfer forming portion 15 is the width thereof toward the end position in the width direction of the short side 11). Is gradually spreading).
  • the width X is about 10 mm to 50 mm (preferably the upper limit is 40 mm and further 30 mm), and the width Y is 3 mm to 40 mm (preferably the lower limit is 5 mm and further 10 mm, the upper limit is 30 mm and further 25 mm).
  • the width X is about 10 mm to 50 mm (preferably the upper limit is 40 mm and further 30 mm)
  • the width Y is 3 mm to 40 mm (preferably the lower limit is 5 mm and further 10 mm, the upper limit is 30 mm and further 25 mm).
  • the width X is about 10 mm to 50 mm (preferably the upper limit is 40 mm and further 30 mm)
  • the width Y is 3 mm to 40 mm (preferably the lower limit is 5 mm and further 10 mm, the upper limit is 30 mm and further 25 mm).
  • the chamfer forming portion By making the width X in the short side direction longer than the width Y in the long side direction as in the chamfer forming portion 15, for example, when manufacturing the short side, the chamfer forming portion can be easily processed and shortened. When transporting or installing the side, damage (bending or cracking) of the chamfer forming part can be prevented, and when using the short side (during continuous casting), the chamfer forming part due to the water guide groove formed on the short side It is possible to suppress a decrease in cooling efficiency, suppress deformation and damage thereof, and further prevent it. If the chamfer forming portion is deformed or damaged, chamfering (chamfering) of the desired shape cannot be performed on the corner portion of the slab.
  • the surface of the chamfer forming portion 15 on the mold space 13 side is composed of a plurality of continuous straight portions 16 and 17 formed so that the horizontal cross section bulges toward the mold space 13 side, and the horizontal cross section is formed.
  • the surface formed by the straight portions 16 and 17 is a contact surface with the molten steel (slab shell) supplied to the mold space portion 15. Of these two straight portions 16 and 17, it is in contact with or close to the long side 12 (the gap between the long side 12 and the surface S1 on the mold space 13 side is 0 mm, or the gap with the surface S1 exceeds 0 mm.
  • the width x1 in the short side direction of the straight portion 17 (closest to the long side 12) located on the side 1 mm or less is, for example, 1 mm to 10 mm (preferably, the lower limit is 2 mm and the upper limit is 7 mm). Further, it is about 5 mm).
  • the angle ⁇ 1 formed by the straight line portion 17 with respect to the surface S1 on the long side 12 on the mold space portion 13 side is more than 60 degrees and less than 90 degrees (preferably, the lower limit is 70 degrees, further 75 degrees, and the upper limit is 85 degrees).
  • the angle ⁇ 1 formed by the surface of the long side and the straight portion is 60 degrees or less, the shape of the end portion on the side that abuts or approaches the surface on the mold space side of the long side becomes too acute, for example. Deformation, damage or chipping of the film, etc. (hereinafter, also referred to as deformation) are likely to occur.
  • the angle ⁇ 1 formed by the straight portion is 90 degrees or more, for example, when the width x1 in the short side direction of the straight portion abutting or approaching the long side forming the chamfer forming portion becomes long, for example, rolling. At that time, bending or cracking may occur at the widthwise end of the slab, which may lead to quality defects or a decrease in yield.
  • the other straight portion 16 located closest to the short side 11 has a surface S2 (at the four corners of the mold wall 14) on the mold space portion 13 side of the short side 11.
  • the angle (rising angle) ⁇ 2 formed by the straight line portion 16 with respect to the surface (molten steel contact surface) of the short side 11 excluding the region R is, for example, 5 to 50 degrees (preferably, the lower limit is 10 degrees, further 20 degrees. , The upper limit is about 40 degrees, and further about 35 degrees).
  • the angle ⁇ 2 formed by the straight line portion is less than 5 degrees, the effect of forming the chamfer forming portion becomes small.
  • the angle ⁇ 2 formed by the straight portion exceeds 50 degrees, for example, the angle formed by the two straight portions becomes small, and deformation or the like is likely to occur.
  • the connecting portion 18 in which the two straight portions 16 and the straight portions 17 are continuous is composed of a curved portion that bulges toward the mold space portion 13 side.
  • the radius of curvature of the curved portion is, for example, about 1 mm to 20 mm (preferably, the lower limit is 3 mm, the upper limit is 10 mm, and further is 7 mm)
  • the connecting portion of the two straight portions 16 and 17 during continuous casting damage to (edges) can be suppressed and even prevented.
  • the angle formed by the two straight portions approaches 180 degrees (for example, when the angle is 160 degrees or more and 170 degrees or less)
  • the continuous connecting portion becomes gentle, so that the curved portion is not formed. You can also.
  • the rising portion of the straight line portion 16 with respect to the surface S2 on the mold space portion 13 side of the short side 11 is a curved portion recessed toward the mold space portion 13 side (the radius of curvature is the curved portion of the above-mentioned connecting portion 18). Although it can be set within a range), it is not necessary to provide a curved portion (see, for example, FIGS. 2 and 3 described later).
  • the straight portion 17a forms with respect to the surface S1 on the mold space portion 13a side of the long side 12.
  • the angle ⁇ 1 may be 90 degrees. Since the structure is substantially the same as that of the continuous casting mold 10 shown in FIG. 1 except for the structure of the chamfer forming portion 15a, “a” is added to each reference numeral and detailed description thereof will be omitted here.
  • the width x2 in the short side direction of the straight line portion 17a is set to a smaller range within the range of the width x1 described above, for example, about 1 mm to 5 mm.
  • the connecting portion 18a is composed of a curved portion that bulges toward the mold space portion 13a side.
  • the surface of the chamfer forming portion on the mold space side is composed of two continuous straight portions having a horizontal cross section. It can also be composed of three or more continuous straight portions (upper limit is, for example, about 10) so as to bulge (approximate to a curved portion).
  • the width of the straight portion in contact with or close to the long side in the short side direction is set within the range of the width x1 in the short side direction and further within the range of the width x2.
  • a part or all of the connecting portion of the plurality of straight portions can be formed by the curved portion described above, but if at least the connecting portion formed in the straight portion in contact with or close to the long side is composed of the curved portion. good.
  • the surface on the mold space portion 13b side is directed toward the mold space portion 13b side in the horizontal cross section. It can also be composed of a curved portion 19 formed so as to bulge. Since the structure is substantially the same as that of the continuous casting mold 10 shown in FIG. 1 except for the structure of the chamfer forming portion 15b, “b” is added to each reference numeral and detailed description thereof will be omitted here.
  • the angle ⁇ 3 formed by the tangent of the rising portion of the curved portion 19 with respect to the surface S1 on the mold space portion 13b side of the long side 12 is more than 60 degrees and 90 degrees or less (preferably, the lower limit is 70 degrees and further 75 degrees. , The upper limit is 85 degrees).
  • the angle ⁇ 4 formed by the tangent of the rising portion of the curved portion 19 with respect to the surface S2b on the mold space portion 13b side of the short side 11b is the same as the above-mentioned formed angle ⁇ 2 (for example, 10 to 50 degrees).
  • the rising portion of the straight portion 16a or the curved portion 19 with respect to the surfaces S2a and S2b on the mold space portions 13a and 13b of the short sides 11a and 11b is shown in FIG. Similar to the chamfer forming portion 15, it can also be formed of a curved line that is recessed toward the mold space portions 13a and 13b.
  • the chamfer forming portion 15 formed on the opposite short side 11 (hereinafter, the same applies to the chamfer forming portion 15a on the short side 11a and the chamfer forming portion 15b on the short side 11b) is provided with a slab shell (solidification shell) in the casting direction. ), An inclined portion is formed in which the interval gradually narrows according to the amount of solidification contraction.
  • the inner cross-sectional shape of the facing chamfer forming portion 15, that is, the surface shape of the inclined portion can be determined by, for example, the method described in Japanese Patent No. 4659706, and will be briefly described below.
  • the surface shape of the vertical cross section of the inclined portion has the same shape in the width direction, and the taper rate increases as the distance from the meniscus position increases, that is, it becomes a multi-taper. ing.
  • the solidification shrinkage profile of the slab in the mold is defined by one or both of a curved line (specified by multiple functions) and a plurality of straight lines. And approximated, and applied it to the surface shape of the inclined part.
  • the amount of contact heat transfer described above is greatly affected by, for example, the type of lubricant used during casting and the difference in the surface shape of the slab (depending on the steel type, oscillation conditions, and type of lubricant). Therefore, it is necessary to grasp the actual contact heat transfer amount for each casting condition as accurately as possible in order to determine the multi-taper.
  • short side inclined portions whose intervals are gradually narrowed according to the solidification shrinkage amount of the slab shell in the casting direction can be formed.
  • the inner cross-sectional shape of the opposite short side 11, that is, the surface shape of the vertical cross section of the short side inclined portion has the same shape over the width direction, and tapers as the distance from the meniscus position increases. It has a shape in which the rate of increase is small, that is, it has a multi-taper. Since the shape of the surface of the inclined portion on the short side can be determined by the method described in Japanese Patent No. 4659706 described above, the description thereof will be omitted.
  • the opposite long sides 12 excluding the regions R at the four corners of the mold wall 14 also have long side inclined portions, that is, multi-taper, in which the intervals gradually narrow according to the solidification shrinkage amount of the slab shell in the casting direction.
  • long side inclined portions that is, multi-taper
  • the end face shape of the short side is a shape along the surface of the long side.
  • the inner cross-sectional shape of the opposite long side that is, the surface shape of the vertical cross section of the long side inclined portion is made the same shape in the width direction, and as the distance from the meniscus position increases. Therefore, the shape is such that the rate of increase in the taper rate is small.
  • the surface shape of the inclined portion on the long side can be determined by the method described in Japanese Patent No. 4659706 described above.
  • a wear-resistant film is formed on the surface of the chamfer forming portion 15 shown in FIG. 1 on the mold space 13 side (also on the entire surface of the short side 11 on the mold space 13 side) (FIG. 2, FIG. The same applies to the chamfer forming portions 15a and 15b shown in FIG. 3).
  • This film includes a thermal spray coating formed by thermal spraying and a plating film formed by electroplating, but from the viewpoint of durability, the thermal spray coating is preferable.
  • This sprayed coating is formed on the surface of the chamfer forming portion 15 on the mold space 13 side (also on the entire surface of the short side 11 on the mold space 13 side), and a roughened base plating layer (for example, Ni) is applied.
  • the sprayed coating is not particularly limited as long as it is composed of components that can be used in the mold, but for example, it can be formed by using Ni-based sprayed particles, and Co-based sprayed particles are used. Can also be formed.
  • thermal sprayed particles formed by mixing a granular cermet material composed of Co, Cr, and the balance WC and a granular Ni—Al alloy containing a predetermined amount of Al can be used.
  • the Ni—Al alloy may contain unavoidable impurities.
  • the cermet material contains Co: 5% by mass or more and 15% by mass or less (preferably, the lower limit is 6% by mass and further 7% by mass, the upper limit is 14% by mass and further 13% by mass), Cr: It is composed of 2% by mass or more and 6% by mass or less (preferably, the lower limit is 3% by mass and the upper limit is 5% by mass) and the balance is WC.
  • the cermet material may contain, for example, Fe or the like as an unavoidable impurity.
  • the Ni—Al alloy has an Al content of more than 0 and 8% by mass or less.
  • the thickness of the sprayed coating is preferably formed densely (filling rate is 90% or more, more preferably 95% or more) in the range of 0.05 mm or more and 1 mm or less.
  • cooling water water passage holes (hereinafter, also simply referred to as water passage holes) having a circular cross section at both ends of the short side 11 (the same applies to the short sides 11a and 11b) in the width direction.
  • the water passage hole is formed on the back surface side of the chamfer forming portion 15.
  • the water passage hole can be formed by forming a hole from one side (in this case, the lower side) of the short side 11 in the casting direction and plugging the opening.
  • a water flow path that communicates with the water guide groove formed at the width direction end of the short side 11 is formed, whereby the cooling water flowing through the water guide groove is sent to the water flow hole. It can be flowed continuously.
  • a cooling water passage groove (hereinafter, also simply referred to as a water passage groove) may be formed on the short side.
  • the water passage groove can be formed on the short side with the configuration shown below. -The bottom of the water passage groove in the depth direction is branched from the water guide groove formed at the widthwise end of the short side so as to be located on the back surface side of the chamfer forming portion (cross section V-shaped).
  • the water guide groove is diagonally formed so that the bottom in the depth direction of the water guide groove formed at both ends in the width direction of the short side is located on the back surface side of the chamfer forming part, and the water guide groove is combined with the water flow groove. do.
  • the short side 11 and the long side 12 are cooled by flowing cooling water from the lower part to the upper part of the mold 10 in each water guide groove.
  • the molten steel supplied to the mold space 13 is cooled (the same applies to the molds 10a and 10b for continuous casting).
  • a part of the cooling water that has flowed into the water guide grooves located at both ends in the width direction of the short side 11 continuously flows into the cooling water flow hole through the water flow path, so that the chamfer forming portion
  • the cooling efficiency of 15 can also be increased.
  • a slab having a width of about 200 mm or more and 3500 mm or less and a thickness of about 50 mm or more and 500 mm or less and chamfered corners. can be manufactured.
  • FIGS. 4 (A) and 4 (C) damage to the edge portion of the chamfer forming portion was compared and examined.
  • FIG. 4A shows a conventional mold, in which the chamfer forming portion has a triangular cross section and the end portion on the side in contact with the long side has an acute angle shape.
  • FIG. 4C shows the mold of this experimental example, and the surface of the chamfer forming portion on the mold space side is composed of two continuous straight portions having a horizontal cross section, and the connecting portion of the two straight portions. Is composed of a curved portion that bulges toward the mold space side (the same configuration as in FIG. 2).
  • the unit of the numerical value other than the numerical value indicating the angle is "mm".
  • the edge portion of the side surface of the short side in contact with the long side is in a high stress state due to the thermal expansion of the short piece and the clamping force of the mold. Therefore, the edge portion of the chamfer forming portion after casting is plastically deformed. Therefore, the plastic deformation of the chamfer forming portion after casting was compared by FEM analysis.
  • the end portion on the long side in contact with the surface of the mold space portion has an acute-angled shape, so that the rigidity is low, and FIG. 4 (A) shows.
  • the amount of deformation after casting was about 1 mm.
  • the continuous casting mold of this experimental example can suppress the occurrence of deformation, film damage, chipping, etc. than before, so that the life can be extended and the quality is good. Can produce slabs with good yield.
  • the present invention has been described above with reference to Examples, the present invention is not limited to the configuration described in the above-described Examples, but is within the scope of the claims. It also includes other possible examples and modifications. For example, the case where a part or all of the above-mentioned Examples and Modifications are combined to form a mold for continuous casting of the present invention is also included in the scope of rights of the present invention.
  • the continuous casting mold shown in the above embodiment can be used in a conventionally used vertical bending type continuous casting machine or curved type continuous casting machine.
  • the present invention is not limited to this, and for example, the cross section of the chamfer forming portion has the same shape in the casting direction. It can also be.
  • the case where the cooling water passage hole (cooling water passage groove) is formed on the short side has been described, but the cooling water passage hole is provided as necessary (chamber forming portion). It does not have to be formed (depending on the cooling state of).
  • the mold for continuous casting of the present invention can improve the rigidity of the end portion of the chamfer forming portion as compared with the conventional one, and the wear-resistant film formed on the surface thereof is also damaged or chipped as compared with the conventional one. It can be reduced in comparison. As a result, the life can be extended as compared with the conventional one, and slabs of good quality can be produced with good yield.
  • 10, 10a, 10b Mold for continuous casting, 11, 11a, 11b: Short side, 12: Long side, 13, 13a, 13b: Mold space, 14, 14a, 14b: Mold wall, 15, 15a, 15b: Chamfer forming part, 16, 16a, 17, 17a: straight part, 18, 18a: connecting part, 19: curved part

Abstract

A continuous casting mold 10 has a mold space section 13 surrounded by a pair of short sides 11 positioned facing each other with a gap therebetween, and a pair of long sides 12 sandwiching the short sides 11 from both width-direction sides thereof. Chamfer formation sections 15 are provided to the short sides 11 in regions R at the four corners of a mold wall 14, which is formed from the pair of short sides 11 and the pair of long sides 13 and which forms the mold space section 13, and the chamfer formation sections 15 project toward the mold space section 13. Molten steel is injected into the mold space section 13, cooled, and drawn out as a slab. The mold-space-section-13-side surface of the chamfer formation section 15 is constituted from a plurality of continuous linear sections 16, 17 formed such that horizontal cross-sections thereof project toward the mold space section 13. An angle θ1 formed by the linear sections 17 that are in contact with or adjacent to the long sides 12, relative to mold-space-section-13-side surfaces S1 of the long sides 12, is greater than 60 degrees and less than 90 degrees. An abrasion-resistant film is formed on the mold-space-section-13-side surfaces of the chamfer formation sections 15.

Description

連続鋳造用鋳型Mold for continuous casting
　本発明は、鋳片を製造するために使用する連続鋳造用鋳型に関する。 The present invention relates to a mold for continuous casting used for producing slabs.
　鋳片は、上下方向に貫通する鋳型空間部が内側に形成された鋳型壁を有する連続鋳造用鋳型（以下、単に鋳型ともいう）を使用し、この鋳型空間部へ供給された溶鋼を鋳型壁で冷却しながら凝固させて鋳造している。この鋳造した鋳片は更に、鋳造方向下流へと搬送され切断されてスラブとなり、このスラブを圧延機によって圧延している。
　しかし、スラブは略断面四角形であるため、このスラブの圧延時に、スラブの幅方向端部に折れ曲がりや割れ等が発生し、品質欠陥や歩留り低下を招くおそれがあった。 For the slab, a mold for continuous casting (hereinafter, also simply referred to as a mold) having a mold wall in which a mold space portion penetrating in the vertical direction is formed inside is used, and molten steel supplied to the mold space portion is used as a mold wall. It is solidified and cast while cooling with. The cast slab is further conveyed downstream in the casting direction and cut into a slab, and the slab is rolled by a rolling mill.
However, since the slab has a substantially quadrangular cross section, bending or cracking may occur at the widthwise end of the slab during rolling of the slab, which may lead to quality defects or a decrease in yield.
　そこで、例えば、特許文献１に、間隔を有して対向配置される一対の短辺と、該短辺を幅方向の両側から挟む一対の長辺とによって囲繞される鋳型空間部を有し、一対の短辺と一対の長辺とからなり、鋳型空間部を形成する鋳型壁の四隅の領域の短辺に、鋳型空間部側へ向けて膨出する断面三角形状のチャンファー形成部を設けた鋳型が開示されている。なお、一対の短辺は、これを挟む一対の長辺によりクランプされている。また、通常は、チャンファー形成部の表面に、耐摩耗性の皮膜（めっき皮膜）が形成されている。 Therefore, for example, Patent Document 1 has a mold space portion surrounded by a pair of short sides arranged to face each other at intervals and a pair of long sides sandwiching the short sides from both sides in the width direction. A chamfer forming portion having a triangular cross section is provided on the short sides of the four corner regions of the mold wall, which is composed of a pair of short sides and a pair of long sides and forms a mold space portion. The template is disclosed. The pair of short sides are clamped by a pair of long sides sandwiching the pair of short sides. Further, usually, a wear-resistant film (plating film) is formed on the surface of the chamfer forming portion.
特許第６０８５５７１号公報Japanese Patent No. 6085571
　連続鋳造時における鋳型の熱変形状態を解析した結果、短辺は、その幅方向に、メニスカス（湯面）レベルより下方へ約８０ｍｍ付近を最大にして熱膨張し、これより下方へ３００ｍｍ（特に２００ｍｍ）程度までの範囲で比較的大きな熱変形が発生していた。特に、熱変形が大きなメニスカス直下近傍では、短辺の鋳型空間部側のコーナーエッジ部が長辺の鋳型空間部側の表面に強く接触することにより、大きな応力が発生していた。
　このため、上記した断面三角形状のチャンファー形成部では、長辺の鋳型空間部側の表面に接触する側の鋭角状となった端部に、例えば、変形、皮膜の損傷や欠け等が発生し易く、鋳型の寿命低下や鋳片の品質不良等を招くおそれがあった。 As a result of analyzing the thermal deformation state of the mold during continuous casting, the short side expands thermally in the width direction with a maximum of about 80 mm below the meniscus (hot water surface) level, and 300 mm below this (particularly). A relatively large thermal deformation occurred in the range up to about 200 mm). In particular, in the vicinity immediately below the meniscus where the thermal deformation is large, a large stress is generated because the corner edge portion on the short side mold space side strongly contacts the surface on the long side mold space side.
For this reason, in the above-mentioned chamfer forming portion having a triangular cross section, for example, deformation, damage or chipping of the film, etc. occur at the acute-angled end portion on the side contacting the surface on the mold space side of the long side. It is easy to do, and there is a risk that the life of the mold will be shortened and the quality of the slab will be poor.
　本発明はかかる事情に鑑みてなされたもので、従来よりも長寿命化が図れると共に、良好な品質の鋳片を歩留りよく製造可能な連続鋳造用鋳型を提供することを目的とする。 The present invention has been made in view of such circumstances, and an object of the present invention is to provide a mold for continuous casting, which can prolong the life of the slab and can produce slabs of good quality with good yield.
　前記目的に沿う第１の発明に係る連続鋳造用鋳型は、間隔を有して対向配置される一対の短辺と、該短辺を幅方向の両側から挟む一対の長辺とによって囲繞される鋳型空間部を有し、前記一対の短辺と前記一対の長辺とからなり、前記鋳型空間部を形成する鋳型壁の四隅の領域の前記短辺に、前記鋳型空間部側へ向けて膨出するチャンファー形成部が設けられ、前記鋳型空間部に溶鋼を注入して冷却し鋳片として引き抜く連続鋳造用鋳型において、
　前記チャンファー形成部の前記鋳型空間部側の表面は、水平断面が前記鋳型空間部側へ向けて膨出するように形成された複数の連続した直線部で構成され、前記長辺の前記鋳型空間部側の表面に対する、前記長辺に当接又は近接する前記直線部のなす角が６０度超９０度未満であり、
　前記チャンファー形成部の前記鋳型空間部側の表面に耐摩耗性の皮膜が形成されている。 The continuous casting mold according to the first invention according to the above object is surrounded by a pair of short sides arranged to face each other at intervals and a pair of long sides sandwiching the short sides from both sides in the width direction. It has a mold space portion, is composed of the pair of short sides and the pair of long sides, and expands toward the mold space portion side on the short sides of the four corner regions of the mold wall forming the mold space portion. In a continuous casting mold, which is provided with a chamfer forming portion to be ejected, molten steel is injected into the mold space, cooled, and drawn as a slab.
The surface of the chamfer forming portion on the mold space side is composed of a plurality of continuous straight portions formed so that the horizontal cross section bulges toward the mold space side, and the mold on the long side is formed. The angle formed by the straight line portion in contact with or close to the long side with respect to the surface on the space portion side is more than 60 degrees and less than 90 degrees.
A wear-resistant film is formed on the surface of the chamfer forming portion on the mold space side.
　前記目的に沿う第２の発明に係る連続鋳造用鋳型は、間隔を有して対向配置される一対の短辺と、該短辺を幅方向の両側から挟む一対の長辺とによって囲繞される鋳型空間部を有し、前記一対の短辺と前記一対の長辺とからなり、前記鋳型空間部を形成する鋳型壁の四隅の領域の前記短辺に、前記鋳型空間部側へ向けて膨出するチャンファー形成部が設けられ、前記鋳型空間部に溶鋼を注入して冷却し鋳片として引き抜く連続鋳造用鋳型において、
　前記チャンファー形成部の前記鋳型空間部側の表面は、水平断面が前記鋳型空間部側へ向けて膨出するように形成された複数の連続した直線部で構成され、しかも、該複数の直線部の連接部分のうち、少なくとも前記長辺に当接又は近接する前記直線部に形成された前記連接部分が、前記鋳型空間部側へ向けて膨出する曲線部で構成され、
　前記チャンファー形成部の前記鋳型空間部側の表面に耐摩耗性の皮膜が形成されている。 The continuous casting mold according to the second invention according to the above object is surrounded by a pair of short sides arranged to face each other at intervals and a pair of long sides sandwiching the short sides from both sides in the width direction. It has a mold space portion, is composed of the pair of short sides and the pair of long sides, and expands toward the mold space portion side on the short sides of the four corner regions of the mold wall forming the mold space portion. In a continuous casting mold, which is provided with a chamfer forming portion to be ejected, molten steel is injected into the mold space, cooled, and drawn as a slab.
The surface of the chamfer forming portion on the mold space side is composed of a plurality of continuous straight lines formed so that the horizontal cross section bulges toward the mold space side, and the plurality of straight lines. Of the connecting portions of the portions, the connecting portion formed on the straight portion that is in contact with or close to the long side is composed of a curved portion that bulges toward the mold space portion side.
A wear-resistant film is formed on the surface of the chamfer forming portion on the mold space side.
　前記目的に沿う第３の発明に係る連続鋳造用鋳型は、間隔を有して対向配置される一対の短辺と、該短辺を幅方向の両側から挟む一対の長辺とによって囲繞される鋳型空間部を有し、前記一対の短辺と前記一対の長辺とからなり、前記鋳型空間部を形成する鋳型壁の四隅の領域の前記短辺に、前記鋳型空間部側へ向けて膨出するチャンファー形成部が設けられ、前記鋳型空間部に溶鋼を注入して冷却し鋳片として引き抜く連続鋳造用鋳型において、
　前記チャンファー形成部の前記鋳型空間部側の表面は、水平断面が前記鋳型空間部側へ向けて膨出するように形成された曲線部で構成され、
　前記チャンファー形成部の前記鋳型空間部側の表面に耐摩耗性の皮膜が形成されている。 The continuous casting mold according to the third invention according to the above object is surrounded by a pair of short sides arranged to face each other at intervals and a pair of long sides sandwiching the short sides from both sides in the width direction. It has a mold space portion, is composed of the pair of short sides and the pair of long sides, and expands toward the mold space portion side on the short sides of the four corner regions of the mold wall forming the mold space portion. In a continuous casting mold, which is provided with a chamfer forming portion to be ejected, molten steel is injected into the mold space, cooled, and drawn as a slab.
The surface of the chamfer forming portion on the mold space side is composed of a curved portion formed so that the horizontal cross section bulges toward the mold space side.
A wear-resistant film is formed on the surface of the chamfer forming portion on the mold space side.
　第１～第３の発明に係る連続鋳造用鋳型において、対向する前記短辺に形成した前記チャンファー形成部には、前記鋳片が引き抜かれる方向に鋳片シェルの凝固収縮量に追従して間隔が徐々に狭まる傾斜部が形成されていることが好ましい。
　第１～第３の発明に係る連続鋳造用鋳型において、前記皮膜は溶射皮膜又はめっき皮膜であるのがよい。 In the continuous casting mold according to the first to third inventions, the chamfer forming portion formed on the opposite short side follows the solidification shrinkage amount of the slab shell in the direction in which the slab is pulled out. It is preferable that an inclined portion is formed in which the interval is gradually narrowed.
In the mold for continuous casting according to the first to third inventions, the film is preferably a sprayed film or a plated film.
　本発明に係る連続鋳造用鋳型は、チャンファー形成部の鋳型空間部側の表面が、水平断面を鋳型空間部側へ向けて膨出するように、複数の連続した直線部又は曲線部で構成されているので、長辺の鋳型空間部側の表面に接触するチャンファー形成部の端部形状を、従来の鋭角状よりも緩やかな形状にできる。これにより、チャンファー形成部の端部の剛性を、従来と比較して向上できる。また、上記したチャンファー形成部の鋳型空間部側の表面に、耐摩耗性の皮膜を形成することで、皮膜の損傷や欠け等も、従来と比較して低減できる。
　従って、従来よりも長寿命化が図れると共に、良好な品質の鋳片を歩留りよく製造できる。 The mold for continuous casting according to the present invention is composed of a plurality of continuous straight portions or curved portions so that the surface of the chamfer forming portion on the mold space side bulges toward the mold space side in the horizontal cross section. Therefore, the shape of the end portion of the chamfer forming portion that contacts the surface of the long side on the mold space side can be made a gentler shape than the conventional sharp-angled shape. As a result, the rigidity of the end portion of the chamfer forming portion can be improved as compared with the conventional case. Further, by forming an wear-resistant film on the surface of the chamfer forming portion on the mold space side, damage or chipping of the film can be reduced as compared with the conventional case.
Therefore, the life can be extended as compared with the conventional case, and slabs of good quality can be produced with good yield.
本発明の第１の実施例に係る連続鋳造用鋳型の部分平断面図である。It is a partial plan sectional view of the mold for continuous casting which concerns on 1st Example of this invention. 本発明の第２の実施例に係る連続鋳造用鋳型の部分平断面図である。It is a partial plan sectional view of the mold for continuous casting which concerns on 2nd Example of this invention. 本発明の第３の実施例に係る連続鋳造用鋳型の部分平断面図である。It is a partial plan sectional view of the mold for continuous casting which concerns on 3rd Example of this invention. （Ａ）、（Ｂ）はそれぞれ従来例に係る連続鋳造用鋳型のチャンファー形成部の部分平断面図、鋳造後のチャンファー形成部の解析結果の説明図、（Ｃ）、（Ｄ）はそれぞれ実験例に係る連続鋳造用鋳型のチャンファー形成部の部分平断面図、鋳造後のチャンファー形成部の解析結果の説明図である。(A) and (B) are partial plan sectional views of the chamfer forming portion of the continuous casting mold according to the conventional example, explanatory views of the analysis results of the chamfer forming portion after casting, (C) and (D) are It is a partial plan sectional view of the chamfer forming part of the continuous casting mold which concerns on an experimental example, and is explanatory drawing of the analysis result of the chamfer forming part after casting, respectively.
　続いて、添付した図面を参照しつつ、本発明を具体化した実施例につき説明し、本発明の理解に供する。
　図１に示すように、本発明の第１の実施例に係る連続鋳造用鋳型（以下、単に鋳型とも記載）１０は、間隔を有して対向配置される一対の短辺１１と、この短辺１１を幅方向の両側から挟む一対の長辺１２とによって囲繞される鋳型空間部１３に溶鋼（図示しない）を注入して冷却し鋳片として引き抜くものであり、従来よりも長寿命化が図れると共に、良好な品質の鋳片を歩留りよく製造可能な鋳型である。以下、詳しく説明する。 Subsequently, an embodiment embodying the present invention will be described with reference to the attached drawings, and the present invention will be understood.
As shown in FIG. 1, the continuous casting mold (hereinafter, also simply referred to as a mold) 10 according to the first embodiment of the present invention has a pair of short sides 11 arranged to face each other at intervals and the short sides thereof. Molten steel (not shown) is injected into the mold space 13 surrounded by a pair of long sides 12 sandwiching the sides 11 from both sides in the width direction, cooled, and pulled out as a slab. It is a mold that can produce slabs of good quality with good yield. The details will be described below.
　一対の短辺１１はそれぞれ、例えば、厚みが１０ｍｍ以上１００ｍｍ以下程度、幅が５０ｍｍ以上５００ｍｍ以下程度、鋳造方向の長さが６００ｍｍ以上１２００ｍｍ以下程度である。この一対の短辺１１は、面対称で同じ構成となっている。
　また、一対の長辺１２はそれぞれ、例えば、厚みが１０ｍｍ以上１００ｍｍ以下程度、対向配置される一対の短辺１１の間隔（長辺１２が鋳片と接触する幅）を２００ｍｍ以上３５００ｍｍ以下の範囲で変更可能とすることのできる幅を有し、鋳造方向の長さは短辺１１と同程度である。
　なお、一対の短辺１１は、これを挟む一対の長辺１２によりクランプされている。 Each of the pair of short sides 11 has a thickness of about 10 mm or more and 100 mm or less, a width of about 50 mm or more and 500 mm or less, and a length in the casting direction of about 600 mm or more and 1200 mm or less. The pair of short sides 11 are plane-symmetrical and have the same configuration.
Further, each of the pair of long sides 12 has a thickness of, for example, about 10 mm or more and 100 mm or less, and the distance between the pair of short sides 11 arranged to face each other (the width at which the long sides 12 come into contact with the slab) is in the range of 200 mm or more and 3500 mm or less. It has a width that can be changed with, and the length in the casting direction is about the same as the short side 11.
The pair of short sides 11 are clamped by a pair of long sides 12 sandwiching the short sides 11.
　上記した短辺１１と長辺１２は銅又は銅合金で構成され、その鋳型空間部１３側の各表面には耐摩耗性の皮膜（図示しない）が形成され、この短辺１１と長辺１２の各裏面に当接し固定されるバックプレート（図示しない）がステンレス製又は鋼製である。
　短辺１１の裏面側（バックプレート側）には、多数の導水溝（図示しない）が鋳造方向（鋳片の引き抜き方向）に設けられている。この多数の導水溝は、例えば、５ｍｍ以上２００ｍｍ以下程度の範囲内の所定ピッチ（同一ピッチ及び／又は異なるピッチ）で、短辺１１の幅方向に形成されている。なお、長辺１２の裏面側にも上記した多数の導水溝が、長辺１２の幅方向に所定ピッチで、鋳造方向に設けられている。 The short side 11 and the long side 12 described above are made of copper or a copper alloy, and an abrasion resistant film (not shown) is formed on each surface on the mold space 13 side thereof, and the short side 11 and the long side 12 are formed. The back plate (not shown) that abuts and is fixed to each back surface of the above is made of stainless steel or steel.
On the back surface side (back plate side) of the short side 11, a large number of water guide grooves (not shown) are provided in the casting direction (drawing direction of the slab). The large number of water conveyance grooves are formed in the width direction of the short side 11 at a predetermined pitch (same pitch and / or different pitch) within a range of, for example, about 5 mm or more and 200 mm or less. A large number of the above-mentioned water guide grooves are also provided on the back surface side of the long side 12 in the casting direction at a predetermined pitch in the width direction of the long side 12.
　上記した一対の短辺１１と一対の長辺１２により、鋳型空間部１３を形成する鋳型壁１４が形成される。
　図１に示すように、鋳型壁１４の四隅の領域Ｒの短辺１１には、鋳型空間部１３側へ向けて膨出するチャンファー形成部１５がそれぞれ形成されている。このように、チャンファー形成部１５を短辺１１の両端部に設けたのは、一対の短辺１１の間隔を調整可能にするためである（１つの鋳型１０で鋳造可能な鋳片の幅を種々変更可能にするためである）。 The mold wall 14 forming the mold space 13 is formed by the pair of short sides 11 and the pair of long sides 12 described above.
As shown in FIG. 1, chamfer forming portions 15 that bulge toward the mold space portion 13 side are formed on the short sides 11 of the four corner regions R of the mold wall 14, respectively. In this way, the chamfer forming portions 15 are provided at both ends of the short sides 11 in order to make the distance between the pair of short sides 11 adjustable (the width of the slab that can be cast by one mold 10). This is to enable various changes).
　鋳型壁１４の四隅の領域Ｒにそれぞれ形成されるチャンファー形成部１５は、同一形状であるが、以下の条件の範囲内で異なる形状でもよい。
　即ち、チャンファー形成部１５は、その概略形状が略断面三角形状となって、短辺１１の幅方向（以下、短辺方向とも記載）の幅Ｘが、長辺１２の幅方向（以下、長辺方向とも記載）の幅（鋳型空間部１３への突出幅）Ｙよりも、長くなっている（即ち、チャンファー形成部１５は、短辺１１の幅方向端位置へ向けて、その幅が徐々に広がっている）。
　例えば、幅Ｘは、１０ｍｍ～５０ｍｍ（好ましくは、上限が４０ｍｍ、更には３０ｍｍ）程度、幅Ｙは、３ｍｍ～４０ｍｍ（好ましくは、下限が５ｍｍ、更には１０ｍｍ、上限が３０ｍｍ、更には２５ｍｍ）程度、である。 The chamfer forming portions 15 formed in the four corner regions R of the mold wall 14 have the same shape, but may have different shapes within the range of the following conditions.
That is, the chamfer forming portion 15 has a substantially triangular shape in a substantially cross-sectional shape, and the width X in the width direction of the short side 11 (hereinafter, also referred to as the short side direction) is the width direction of the long side 12 (hereinafter, also referred to as the short side direction). The width (also described as the long side direction) is longer than the width (protruding width to the mold space portion 13) Y (that is, the chamfer forming portion 15 is the width thereof toward the end position in the width direction of the short side 11). Is gradually spreading).
For example, the width X is about 10 mm to 50 mm (preferably the upper limit is 40 mm and further 30 mm), and the width Y is 3 mm to 40 mm (preferably the lower limit is 5 mm and further 10 mm, the upper limit is 30 mm and further 25 mm). Degree.
　このチャンファー形成部１５のように、短辺方向の幅Ｘを長辺方向の幅Ｙよりも長くすることで、例えば、短辺の製造時は、チャンファー形成部の加工が容易となり、短辺の搬送時や設置時は、チャンファー形成部の損傷（折れ曲がりや割れ）等を防止でき、短辺の使用時（連続鋳造時）は、短辺に形成した導水溝によるチャンファー形成部の冷却効率の低下を抑制し、その変形や損傷を抑制、更には防止できる。なお、チャンファー形成部が変形したり損傷したりすると、鋳片角部に目的とする形状の面取り（チャンファー）ができなくなる。 By making the width X in the short side direction longer than the width Y in the long side direction as in the chamfer forming portion 15, for example, when manufacturing the short side, the chamfer forming portion can be easily processed and shortened. When transporting or installing the side, damage (bending or cracking) of the chamfer forming part can be prevented, and when using the short side (during continuous casting), the chamfer forming part due to the water guide groove formed on the short side It is possible to suppress a decrease in cooling efficiency, suppress deformation and damage thereof, and further prevent it. If the chamfer forming portion is deformed or damaged, chamfering (chamfering) of the desired shape cannot be performed on the corner portion of the slab.
　チャンファー形成部１５の鋳型空間部１３側の表面は、水平断面が鋳型空間部１３側へ向けて膨出するように形成された複数の連続した直線部１６、１７で構成され、水平断面が直線部１６、１７で形成される表面が、鋳型空間部１５に供給される溶鋼（鋳片シェル）との接触面となっている。
　この２本の直線部１６、１７のうち、長辺１２に当接又は近接（長辺１２の鋳型空間部１３側の表面Ｓ１との隙間が０ｍｍ、又は、表面Ｓ１との隙間が０ｍｍを超え１ｍｍ以下、以下同じ）する側に位置する（長辺１２に最も近い位置にある）直線部１７の短辺方向の幅ｘ１は、例えば、１ｍｍ～１０ｍｍ（好ましくは、下限が２ｍｍ、上限が７ｍｍ、更には５ｍｍ）程度である。 The surface of the chamfer forming portion 15 on the mold space 13 side is composed of a plurality of continuous straight portions 16 and 17 formed so that the horizontal cross section bulges toward the mold space 13 side, and the horizontal cross section is formed. The surface formed by the straight portions 16 and 17 is a contact surface with the molten steel (slab shell) supplied to the mold space portion 15.
Of these two straight portions 16 and 17, it is in contact with or close to the long side 12 (the gap between the long side 12 and the surface S1 on the mold space 13 side is 0 mm, or the gap with the surface S1 exceeds 0 mm. The width x1 in the short side direction of the straight portion 17 (closest to the long side 12) located on the side 1 mm or less (the same applies hereinafter) is, for example, 1 mm to 10 mm (preferably, the lower limit is 2 mm and the upper limit is 7 mm). Further, it is about 5 mm).
　長辺１２の鋳型空間部１３側の表面Ｓ１に対する、直線部１７のなす角θ１は６０度超９０度未満（好ましくは、下限が７０度、更には７５度、上限が８５度）である。
　ここで、長辺の表面と直線部のなす角θ１が６０度以下の場合、長辺の鋳型空間部側の表面に当接又は近接する側の端部形状が鋭角状になり過ぎ、例えば、変形、皮膜の損傷や欠け等（以下、変形等とも記載）が発生し易くなる。一方、直線部のなす角θ１が９０度以上の場合、例えば、チャンファー形成部を構成する、長辺に当接又は近接する直線部の短辺方向の幅ｘ１が長くなると、例えば、圧延の際にスラブの幅方向端部に折れ曲がりや割れ等が発生して、品質欠陥や歩留り低下を招くおそれがある。 The angle θ1 formed by the straight line portion 17 with respect to the surface S1 on the long side 12 on the mold space portion 13 side is more than 60 degrees and less than 90 degrees (preferably, the lower limit is 70 degrees, further 75 degrees, and the upper limit is 85 degrees).
Here, when the angle θ1 formed by the surface of the long side and the straight portion is 60 degrees or less, the shape of the end portion on the side that abuts or approaches the surface on the mold space side of the long side becomes too acute, for example. Deformation, damage or chipping of the film, etc. (hereinafter, also referred to as deformation) are likely to occur. On the other hand, when the angle θ1 formed by the straight portion is 90 degrees or more, for example, when the width x1 in the short side direction of the straight portion abutting or approaching the long side forming the chamfer forming portion becomes long, for example, rolling. At that time, bending or cracking may occur at the widthwise end of the slab, which may lead to quality defects or a decrease in yield.
　上記した２本の直線部１６、１７のうち、他方の（短辺１１に最も近い位置にある）直線部１６について、短辺１１の鋳型空間部１３側の表面Ｓ２（鋳型壁１４の四隅の領域Ｒを除いた短辺１１の表面（溶鋼接触面））に対する、直線部１６のなす角（立ち上がり角度）θ２は、例えば、５～５０度（好ましくは、下限が１０度、更には２０度、上限が４０度、更には３５度）程度である。
　ここで、直線部のなす角θ２が５度未満の場合、チャンファー形成部を形成したことによる作用効果が小さくなる。一方、直線部のなす角θ２が５０度超の場合、例えば、２つの直線部のなす角が小さくなって、変形等が発生し易くなる。 Of the two straight portions 16 and 17 described above, the other straight portion 16 (located closest to the short side 11) has a surface S2 (at the four corners of the mold wall 14) on the mold space portion 13 side of the short side 11. The angle (rising angle) θ2 formed by the straight line portion 16 with respect to the surface (molten steel contact surface) of the short side 11 excluding the region R is, for example, 5 to 50 degrees (preferably, the lower limit is 10 degrees, further 20 degrees. , The upper limit is about 40 degrees, and further about 35 degrees).
Here, when the angle θ2 formed by the straight line portion is less than 5 degrees, the effect of forming the chamfer forming portion becomes small. On the other hand, when the angle θ2 formed by the straight portion exceeds 50 degrees, for example, the angle formed by the two straight portions becomes small, and deformation or the like is likely to occur.
　この２本の直線部１６と直線部１７とが連続する連接部分１８は、鋳型空間部１３側へ向けて膨出する曲線部で構成されている。
　ここで、曲線部の曲率半径は、例えば、１ｍｍ～２０ｍｍ（好ましくは、下限が３ｍｍ、上限が１０ｍｍ、更には７ｍｍ）程度であるので、連続鋳造時における２つの直線部１６、１７の連接部分（エッジとなる部分）の損傷を抑制、更には防止できる。
　なお、２つの直線部のなす角が１８０度に近づく場合（例えば、１６０度以上１７０度以下程度の場合）は、その連続する連接部分が緩やかになるため、曲線部を形成しない構成とすることもできる。
　また、短辺１１の鋳型空間部１３側の表面Ｓ２に対する、直線部１６の立ち上がり部分は、鋳型空間部１３側へ向けて凹んだ曲線部（曲率半径は、上記した連接部分１８の曲線部の範囲内で設定できる）で構成しているが、曲線部を設けなくてもよい（例えば、後述する図２、図３参照）。 The connecting portion 18 in which the two straight portions 16 and the straight portions 17 are continuous is composed of a curved portion that bulges toward the mold space portion 13 side.
Here, since the radius of curvature of the curved portion is, for example, about 1 mm to 20 mm (preferably, the lower limit is 3 mm, the upper limit is 10 mm, and further is 7 mm), the connecting portion of the two straight portions 16 and 17 during continuous casting. Damage to (edges) can be suppressed and even prevented.
When the angle formed by the two straight portions approaches 180 degrees (for example, when the angle is 160 degrees or more and 170 degrees or less), the continuous connecting portion becomes gentle, so that the curved portion is not formed. You can also.
Further, the rising portion of the straight line portion 16 with respect to the surface S2 on the mold space portion 13 side of the short side 11 is a curved portion recessed toward the mold space portion 13 side (the radius of curvature is the curved portion of the above-mentioned connecting portion 18). Although it can be set within a range), it is not necessary to provide a curved portion (see, for example, FIGS. 2 and 3 described later).
　また、図２に示す本発明の第２の実施例に係る連続鋳造用鋳型１０ａのチャンファー形成部１５ａのように、長辺１２の鋳型空間部１３ａ側の表面Ｓ１に対する、直線部１７ａのなす角θ１を９０度にしてもよい。このチャンファー形成部１５ａの構成以外は、図１に示す連続鋳造用鋳型１０と略同様の構成であるため、ここでは、各符号に「ａ」を付して詳しい説明を省略する。
　この場合、直線部１７ａの短辺方向の幅ｘ２を上記した幅ｘ１の範囲内の小さい側の範囲、例えば、１ｍｍ～５ｍｍ程度にする。また、２本の直線部１６ａ、１７ａのなす角が、図１に示す２本の直線部１６、１７のなす角よりも小さくなるため、２本の直線部１６ａと直線部１７ａとが連続する連接部分１８ａは、鋳型空間部１３ａ側へ向けて膨出する曲線部で構成する。 Further, like the chamfer forming portion 15a of the continuous casting mold 10a according to the second embodiment of the present invention shown in FIG. 2, the straight portion 17a forms with respect to the surface S1 on the mold space portion 13a side of the long side 12. The angle θ1 may be 90 degrees. Since the structure is substantially the same as that of the continuous casting mold 10 shown in FIG. 1 except for the structure of the chamfer forming portion 15a, “a” is added to each reference numeral and detailed description thereof will be omitted here.
In this case, the width x2 in the short side direction of the straight line portion 17a is set to a smaller range within the range of the width x1 described above, for example, about 1 mm to 5 mm. Further, since the angle formed by the two straight portions 16a and 17a is smaller than the angle formed by the two straight portions 16 and 17 shown in FIG. 1, the two straight portions 16a and the straight portion 17a are continuous. The connecting portion 18a is composed of a curved portion that bulges toward the mold space portion 13a side.
　上記した連続鋳造用鋳型１０、１０ａでは、チャンファー形成部の鋳型空間部側の表面を、水平断面が２本の連続した直線部で構成した場合について説明したが、鋳型空間部側へ向けて膨出するように３本以上（上限は、例えば１０本程度）の連続した直線部で構成する（曲線部に近似させる）こともできる。
　この場合、長辺に当接又は近接する直線部の短辺方向の幅については、上記した短辺方向の幅ｘ１の範囲内、更には幅ｘ２の範囲内で設定する。
　また、複数の直線部の連接部分の一部又は全部を、上記した曲線部で構成できるが、少なくとも長辺に当接又は近接する直線部に形成された連接部分が曲線部で構成されればよい。 In the above-mentioned continuous casting molds 10 and 10a, the case where the surface of the chamfer forming portion on the mold space side is composed of two continuous straight portions having a horizontal cross section has been described. It can also be composed of three or more continuous straight portions (upper limit is, for example, about 10) so as to bulge (approximate to a curved portion).
In this case, the width of the straight portion in contact with or close to the long side in the short side direction is set within the range of the width x1 in the short side direction and further within the range of the width x2.
Further, a part or all of the connecting portion of the plurality of straight portions can be formed by the curved portion described above, but if at least the connecting portion formed in the straight portion in contact with or close to the long side is composed of the curved portion. good.
　更に、図３に示す本発明の第３の実施例に係る連続鋳造用鋳型１０ｂのチャンファー形成部１５ｂのように、鋳型空間部１３ｂ側の表面を、水平断面が鋳型空間部１３ｂ側へ向けて膨出するように形成された曲線部１９で構成することもできる。このチャンファー形成部１５ｂの構成以外は、図１に示す連続鋳造用鋳型１０と略同様の構成であるため、ここでは、各符号に「ｂ」を付して詳しい説明を省略する。 Further, as in the chamfer forming portion 15b of the continuous casting mold 10b according to the third embodiment of the present invention shown in FIG. 3, the surface on the mold space portion 13b side is directed toward the mold space portion 13b side in the horizontal cross section. It can also be composed of a curved portion 19 formed so as to bulge. Since the structure is substantially the same as that of the continuous casting mold 10 shown in FIG. 1 except for the structure of the chamfer forming portion 15b, “b” is added to each reference numeral and detailed description thereof will be omitted here.
　ここで、長辺１２の鋳型空間部１３ｂ側の表面Ｓ１に対する、曲線部１９の立ち上がり部分の接線のなす角θ３は、６０度超９０度以下（好ましくは、下限が７０度、更には７５度、上限が８５度）であるのがよい。また、短辺１１ｂの鋳型空間部１３ｂ側の表面Ｓ２ｂに対する、曲線部１９の立ち上がり部分の接線のなす角θ４は、前記したなす角θ２（例えば、１０～５０度）と同じである。
　なお、上記した各チャンファー形成部１５ａ、１５ｂについて、短辺１１ａ、１１ｂの鋳型空間部１３ａ、１３ｂ側の表面Ｓ２ａ、Ｓ２ｂに対する、直線部１６ａ又は曲線部１９の立ち上がり部分は、図１に示すチャンファー形成部１５と同様、鋳型空間部１３ａ、１３ｂ側へ向けて凹んだ曲線で構成することもできる。 Here, the angle θ3 formed by the tangent of the rising portion of the curved portion 19 with respect to the surface S1 on the mold space portion 13b side of the long side 12 is more than 60 degrees and 90 degrees or less (preferably, the lower limit is 70 degrees and further 75 degrees. , The upper limit is 85 degrees). Further, the angle θ4 formed by the tangent of the rising portion of the curved portion 19 with respect to the surface S2b on the mold space portion 13b side of the short side 11b is the same as the above-mentioned formed angle θ2 (for example, 10 to 50 degrees).
For each of the above-mentioned chamfer forming portions 15a and 15b, the rising portion of the straight portion 16a or the curved portion 19 with respect to the surfaces S2a and S2b on the mold space portions 13a and 13b of the short sides 11a and 11b is shown in FIG. Similar to the chamfer forming portion 15, it can also be formed of a curved line that is recessed toward the mold space portions 13a and 13b.
　対向する短辺１１に形成したチャンファー形成部１５（以下、短辺１１ａのチャンファー形成部１５ａ、短辺１１ｂのチャンファー形成部１５ｂも同様）には、鋳造方向に鋳片シェル（凝固シェル）の凝固収縮量に追従して間隔が徐々に狭まる傾斜部が形成されている。この対向するチャンファー形成部１５の内側断面形状、即ち、傾斜部の表面形状は、例えば、特許第４６５９７０６号公報に記載の方法で決定できるため、以下、簡単に説明する。
　傾斜部の縦断面の表面形状は、その幅方向に渡って同一形状となっており、メニスカス位置からの距離の増加に伴って、テーパ率の増加率が小さくなる形状、即ち、マルチテーパとなっている。このマルチテーパとは、鋳型内（メニスカス位置（湯面）から鋳型出口まで）での鋳片の凝固収縮プロフィールを、曲線（複数の関数で規定）及び複数の直線のいずれか一方又は双方を使用して近似し、それを傾斜部の表面形状に適用したものである。 The chamfer forming portion 15 formed on the opposite short side 11 (hereinafter, the same applies to the chamfer forming portion 15a on the short side 11a and the chamfer forming portion 15b on the short side 11b) is provided with a slab shell (solidification shell) in the casting direction. ), An inclined portion is formed in which the interval gradually narrows according to the amount of solidification contraction. The inner cross-sectional shape of the facing chamfer forming portion 15, that is, the surface shape of the inclined portion can be determined by, for example, the method described in Japanese Patent No. 4659706, and will be briefly described below.
The surface shape of the vertical cross section of the inclined portion has the same shape in the width direction, and the taper rate increases as the distance from the meniscus position increases, that is, it becomes a multi-taper. ing. With this multi-taper, the solidification shrinkage profile of the slab in the mold (from the meniscus position (hot water surface) to the mold outlet) is defined by one or both of a curved line (specified by multiple functions) and a plurality of straight lines. And approximated, and applied it to the surface shape of the inclined part.
　以下、マルチテーパの決定方法について、簡単に説明する。
　マルチテーパは、下記に示す条件を考慮して、また、実際に測定した結果を基にして、３次元の鋳片の凝固収縮及び鋳型の熱変形を考慮したＦＥＭ解析（有限要素法を用いた解析、以下同様）により求めている。具体的には、鋳片の形状、鋳片のサイズ、鋳込み条件（例えば、鋳込み温度、引抜き速度、鋳型冷却条件等）、鋳込み鋼種の成分に由来する物理量（例えば、液相温度、固相温度、変態温度、線膨張率、剛性値等）、鋳型と鋳片との間の接触熱移動量（鋳片の収縮量は、この量に大きく影響される）等を用いる。
　なお、上記した接触熱移動量は、例えば、鋳造時に使用する潤滑材の種類や鋳片の表面形状（鋼種、オシレーション条件、潤滑材種類に依存）の違いに大きく影響される。従って、各鋳込み条件ごとの実績の接触熱移動量をできるだけ正確に把握することが、マルチテーパの決定には必要とされる。 Hereinafter, the method for determining the multi-taper will be briefly described.
For multi-taper, FEM analysis (using the finite element method) considering the conditions shown below and the solidification shrinkage of the three-dimensional slab and the thermal deformation of the mold based on the actual measurement results. It is obtained by analysis (the same applies hereinafter). Specifically, the shape of the slab, the size of the slab, the casting conditions (for example, casting temperature, drawing speed, mold cooling conditions, etc.), and the physical quantities derived from the components of the cast steel type (for example, liquid phase temperature, solid phase temperature). , Transformation temperature, linear expansion rate, rigidity value, etc.), contact heat transfer amount between the mold and the slab (the amount of shrinkage of the slab is greatly affected by this amount), etc. are used.
The amount of contact heat transfer described above is greatly affected by, for example, the type of lubricant used during casting and the difference in the surface shape of the slab (depending on the steel type, oscillation conditions, and type of lubricant). Therefore, it is necessary to grasp the actual contact heat transfer amount for each casting condition as accurately as possible in order to determine the multi-taper.
　また、鋳型壁１４の四隅の領域Ｒを除いた対向する短辺１１には、鋳造方向に鋳片シェルの凝固収縮量に追従して間隔が徐々に狭まる短辺側傾斜部を形成することが好ましい。
　対向する短辺１１の内側断面形状、即ち短辺側傾斜部の縦断面の表面の形状は、その幅方向に渡って同一形状となっており、メニスカス位置からの距離の増加に伴って、テーパ率の増加率が小さくなる形状、即ち、マルチテーパとなっている。
　なお、短辺側傾斜部の表面の形状は、例えば、上記した特許第４６５９７０６号公報に記載の方法で決定できるため、説明を省略する。 Further, on the opposite short sides 11 excluding the regions R at the four corners of the mold wall 14, short side inclined portions whose intervals are gradually narrowed according to the solidification shrinkage amount of the slab shell in the casting direction can be formed. preferable.
The inner cross-sectional shape of the opposite short side 11, that is, the surface shape of the vertical cross section of the short side inclined portion has the same shape over the width direction, and tapers as the distance from the meniscus position increases. It has a shape in which the rate of increase is small, that is, it has a multi-taper.
Since the shape of the surface of the inclined portion on the short side can be determined by the method described in Japanese Patent No. 4659706 described above, the description thereof will be omitted.
　更に、鋳型壁１４の四隅の領域Ｒを除いた対向する長辺１２にも、鋳造方向に鋳片シェルの凝固収縮量に追従して間隔が徐々に狭まる長辺側傾斜部、即ち、マルチテーパを形成することが好ましいが、メニスカス位置から鋳型出口まで、同じ割合で傾斜させた形状、即ち、シングルテーパとすることもできる。この場合、短辺の端面形状は、長辺の表面に沿った形状となる。
　なお、マルチテーパとする場合、対向する長辺の内側断面形状、即ち長辺側傾斜部の縦断面の表面形状を、その幅方向に渡って同一形状とし、メニスカス位置からの距離の増加に伴って、テーパ率の増加率が小さくなる形状とする。なお、長辺側傾斜部の表面形状は、上記した特許第４６５９７０６号公報に記載の方法で決定できる。 Further, the opposite long sides 12 excluding the regions R at the four corners of the mold wall 14 also have long side inclined portions, that is, multi-taper, in which the intervals gradually narrow according to the solidification shrinkage amount of the slab shell in the casting direction. However, it is also possible to form a shape that is inclined at the same ratio from the meniscus position to the mold outlet, that is, a single taper. In this case, the end face shape of the short side is a shape along the surface of the long side.
In the case of multi-tapering, the inner cross-sectional shape of the opposite long side, that is, the surface shape of the vertical cross section of the long side inclined portion is made the same shape in the width direction, and as the distance from the meniscus position increases. Therefore, the shape is such that the rate of increase in the taper rate is small. The surface shape of the inclined portion on the long side can be determined by the method described in Japanese Patent No. 4659706 described above.
　図１に示すチャンファー形成部１５の鋳型空間部１３側の表面には（短辺１１の鋳型空間部１３側の全表面にも）、耐摩耗性の皮膜が形成されている（図２、図３に示すチャンファー形成部１５ａ、１５ｂも同様）。
　この皮膜には、溶射により形成された溶射皮膜や電気めっきにより形成されためっき皮膜があるが、耐久性の観点から、溶射皮膜であることが好ましい。
　この溶射皮膜は、チャンファー形成部１５の鋳型空間部１３側の表面に（短辺１１の鋳型空間部１３側の全表面にも）、粗面化処理がなされた下地めっき層（例えば、Ｎｉ、Ｃｏ、Ｆｅ、又はこれらのいずれか１又は２以上を基材とする合金）を介して、溶射粒子を火炎溶射機で溶射して形成される。
　なお、溶射皮膜は、鋳型に使用可能な成分で構成されれば特に限定されるものではないが、例えば、Ｎｉ系の溶射粒子を使用して形成でき、また、Ｃｏ系等の溶射粒子を使用して形成することもできる。 A wear-resistant film is formed on the surface of the chamfer forming portion 15 shown in FIG. 1 on the mold space 13 side (also on the entire surface of the short side 11 on the mold space 13 side) (FIG. 2, FIG. The same applies to the chamfer forming portions 15a and 15b shown in FIG. 3).
This film includes a thermal spray coating formed by thermal spraying and a plating film formed by electroplating, but from the viewpoint of durability, the thermal spray coating is preferable.
This sprayed coating is formed on the surface of the chamfer forming portion 15 on the mold space 13 side (also on the entire surface of the short side 11 on the mold space 13 side), and a roughened base plating layer (for example, Ni) is applied. , Co, Fe, or an alloy based on any one or more of these), which is formed by spraying the sprayed particles with a flame sprayer.
The sprayed coating is not particularly limited as long as it is composed of components that can be used in the mold, but for example, it can be formed by using Ni-based sprayed particles, and Co-based sprayed particles are used. Can also be formed.
　例えば、Ｃｏ、Ｃｒ、及び、残部ＷＣからなる粒状のサーメット材料と、所定量のＡｌを含有する粒状のＮｉ－Ａｌ合金とを混合して形成した溶射粒子を使用できる。なお、Ｎｉ－Ａｌ合金には、不可避的不純物が含まれていてもよい。
　具体的には、サーメット材料は、Ｃｏ：５質量％以上１５質量％以下（好ましくは、下限を６質量％、更には７質量％、上限を１４質量％、更には１３質量％）、Ｃｒ：２質量％以上６質量％以下（好ましくは、下限を３質量％、上限を５質量％）、残部ＷＣで構成されている。なお、サーメット材料には、不可避的不純物として、例えば、Ｆｅ等が含まれていてもよい。
　また、Ｎｉ－Ａｌ合金は、Ａｌ含有量を０を超え８質量％以下としている。
　上記した溶射皮膜の厚みは、０．０５ｍｍ以上１ｍｍ以下の範囲で密に（充填率が９０％以上、更には９５％以上で）形成されていることが好ましい。 For example, thermal sprayed particles formed by mixing a granular cermet material composed of Co, Cr, and the balance WC and a granular Ni—Al alloy containing a predetermined amount of Al can be used. The Ni—Al alloy may contain unavoidable impurities.
Specifically, the cermet material contains Co: 5% by mass or more and 15% by mass or less (preferably, the lower limit is 6% by mass and further 7% by mass, the upper limit is 14% by mass and further 13% by mass), Cr: It is composed of 2% by mass or more and 6% by mass or less (preferably, the lower limit is 3% by mass and the upper limit is 5% by mass) and the balance is WC. The cermet material may contain, for example, Fe or the like as an unavoidable impurity.
Further, the Ni—Al alloy has an Al content of more than 0 and 8% by mass or less.
The thickness of the sprayed coating is preferably formed densely (filling rate is 90% or more, more preferably 95% or more) in the range of 0.05 mm or more and 1 mm or less.
　短辺１１（短辺１１ａ、１１ｂも同様）の幅方向両端部にはそれぞれ、断面円形の冷却水用通水穴（以下、単に通水穴ともいう）を設けることが好ましい。
　通水穴はチャンファー形成部１５の裏面側に形成されている。なお、通水穴は、短辺１１の鋳造方向一方側（ここでは、下側）から穴を形成し、その開口部に栓をすることで形成できる。
　通水穴の鋳造方向両端部には、短辺１１の幅方向端部に形成された導水溝に連通する通水流路が形成され、これにより、導水溝を流れる冷却水を、通水穴に連続的に流すことができる。 It is preferable to provide cooling water water passage holes (hereinafter, also simply referred to as water passage holes) having a circular cross section at both ends of the short side 11 (the same applies to the short sides 11a and 11b) in the width direction.
The water passage hole is formed on the back surface side of the chamfer forming portion 15. The water passage hole can be formed by forming a hole from one side (in this case, the lower side) of the short side 11 in the casting direction and plugging the opening.
At both ends of the water flow hole in the casting direction, a water flow path that communicates with the water guide groove formed at the width direction end of the short side 11 is formed, whereby the cooling water flowing through the water guide groove is sent to the water flow hole. It can be flowed continuously.
　なお、短辺には、上記した冷却水用通水穴の代わりに、冷却水用通水溝（ 以下、単に通水溝ともいう）を形成することもできる。この場合、通水溝は、以下に示す構成で、短辺に形成することができる。
・通水溝の深さ方向底部が、チャンファー形成部の裏面側に位置するように、短辺の幅方向端部に形成された導水溝から分岐させる（断面Ｖ字状）。
・短辺の幅方向両端部に形成された導水溝の深さ方向底部が、チャンファー形成部の裏面側に位置するように、導水溝を斜めに形成し、この導水溝を通水溝とする。 It should be noted that, instead of the above-mentioned cooling water passage hole, a cooling water passage groove (hereinafter, also simply referred to as a water passage groove) may be formed on the short side. In this case, the water passage groove can be formed on the short side with the configuration shown below.
-The bottom of the water passage groove in the depth direction is branched from the water guide groove formed at the widthwise end of the short side so as to be located on the back surface side of the chamfer forming portion (cross section V-shaped).
-The water guide groove is diagonally formed so that the bottom in the depth direction of the water guide groove formed at both ends in the width direction of the short side is located on the back surface side of the chamfer forming part, and the water guide groove is combined with the water flow groove. do.
　以上に示した連続鋳造用鋳型１０の使用にあっては、各導水溝に、鋳型１０の下部から上部へ向けて冷却水を流すことにより、短辺１１及び長辺１２の冷却を行うと共に、鋳型空間部１３に供給された溶鋼の冷却を行う（連続鋳造用鋳型１０ａ、１０ｂも同様）。このとき、短辺１１の幅方向両端部に位置する導水溝に流れ込んだ冷却水の一部が、通水流路を介して、冷却水用通水穴に連続的に流れるため、チャンファー形成部１５の冷却効率も高めることができる。
　これにより、例えば、変形、皮膜の損傷や欠け等を抑制、更には、防止しながら、例えば、幅が２００ｍｍ以上３５００ｍｍ以下程度、厚みが５０ｍｍ以上５００ｍｍ以下程度で、角部が面取りされた鋳片を製造できる。 In the use of the continuous casting mold 10 shown above, the short side 11 and the long side 12 are cooled by flowing cooling water from the lower part to the upper part of the mold 10 in each water guide groove. The molten steel supplied to the mold space 13 is cooled (the same applies to the molds 10a and 10b for continuous casting). At this time, a part of the cooling water that has flowed into the water guide grooves located at both ends in the width direction of the short side 11 continuously flows into the cooling water flow hole through the water flow path, so that the chamfer forming portion The cooling efficiency of 15 can also be increased.
Thereby, for example, while suppressing or further preventing deformation, damage or chipping of the film, for example, a slab having a width of about 200 mm or more and 3500 mm or less and a thickness of about 50 mm or more and 500 mm or less and chamfered corners. Can be manufactured.
実験例Experimental example
　次に、本発明の作用効果を確認するために行った実験例について説明する。
　ここでは、図４（Ａ）、（Ｃ）にそれぞれ示すチャンファー形成部が設けられた短辺を有する鋳型を用い、チャンファー形成部のエッジ部の損傷について比較し検討した。なお、図４（Ａ）は従来の鋳型であり、チャンファー形成部は断面三角形状となって、長辺に接触する側の端部が鋭角状となっている。また、図４（Ｃ）は本実験例の鋳型であり、チャンファー形成部の鋳型空間部側の表面は水平断面が２つの連続した直線部で構成され、しかも、２つの直線部の連接部分が鋳型空間部側へ向けて膨出する曲線部で構成されている（図２と同じ構成）。この図４（Ａ）、（Ｃ）において、角度を示す数値以外の数値の単位は「ｍｍ」である。 Next, an experimental example conducted for confirming the action and effect of the present invention will be described.
Here, using a mold having a short side provided with the chamfer forming portion shown in FIGS. 4 (A) and 4 (C), damage to the edge portion of the chamfer forming portion was compared and examined. Note that FIG. 4A shows a conventional mold, in which the chamfer forming portion has a triangular cross section and the end portion on the side in contact with the long side has an acute angle shape. Further, FIG. 4C shows the mold of this experimental example, and the surface of the chamfer forming portion on the mold space side is composed of two continuous straight portions having a horizontal cross section, and the connecting portion of the two straight portions. Is composed of a curved portion that bulges toward the mold space side (the same configuration as in FIG. 2). In FIGS. 4A and 4C, the unit of the numerical value other than the numerical value indicating the angle is "mm".
　前記したように、鋳造中は、短片の熱膨張と鋳型のクランプ力により、長辺と接触する短辺側面のエッジ部が高い応力状態となる。このため、鋳造後のチャンファー形成部のエッジ部は塑性変形する。
　そこで、鋳造後のチャンファー形成部の塑性変形をＦＥＭ解析により比較した。
　図４（Ａ）に示す従来の鋳型のチャンファー形成部では、長辺の鋳型空間部側の表面に接触する側の端部が鋭角状となっているため、その剛性が低く、図４（Ｂ）に示すように、鋳造後の変形量が１ｍｍ程度発生することがわかった。
　一方、図４（Ｃ）に示す本実験例の鋳型のチャンファー形成部では、長辺の鋳型空間部側の表面に接触する側の端部の剛性を向上させたことから、図４（Ｄ）に示すように、鋳造後の変形量を従来の鋳型の１／２以下（０．４８ｍｍ）まで低減できることがわかった。 As described above, during casting, the edge portion of the side surface of the short side in contact with the long side is in a high stress state due to the thermal expansion of the short piece and the clamping force of the mold. Therefore, the edge portion of the chamfer forming portion after casting is plastically deformed.
Therefore, the plastic deformation of the chamfer forming portion after casting was compared by FEM analysis.
In the conventional mold chamfer forming portion shown in FIG. 4 (A), the end portion on the long side in contact with the surface of the mold space portion has an acute-angled shape, so that the rigidity is low, and FIG. 4 (A) shows. As shown in B), it was found that the amount of deformation after casting was about 1 mm.
On the other hand, in the chamfer forming portion of the mold of the present experimental example shown in FIG. 4 (C), the rigidity of the end portion on the side of the long side in contact with the surface of the mold space portion was improved. ), It was found that the amount of deformation after casting can be reduced to less than 1/2 (0.48 mm) of the conventional mold.
　以上のことから、本実験例の連続鋳造用鋳型は、従来よりも、例えば、変形、皮膜の損傷や欠け等の発生を抑制できるため、従来よりも長寿命化が図れると共に、良好な品質の鋳片を歩留りよく製造できる。 From the above, the continuous casting mold of this experimental example can suppress the occurrence of deformation, film damage, chipping, etc. than before, so that the life can be extended and the quality is good. Can produce slabs with good yield.
　以上、本発明を、実施例を参照して説明してきたが、本発明は何ら上記した実施例に記載の構成に限定されるものではなく、請求の範囲に記載されている事項の範囲内で考えられるその他の実施例や変形例も含むものである。例えば、前記したそれぞれの実施例や変形例の一部又は全部を組合せて本発明の連続鋳造用鋳型を構成する場合も本発明の権利範囲に含まれる。
　前記実施例に示した連続鋳造用鋳型は、従来使用されている垂直曲げ型の連続鋳造機や湾曲型の連続鋳造機に使用できる。
　また、前記実施例においては、チャンファー形成部に傾斜部を形成した場合について説明したが、これに限定されるものではなく、例えば、チャンファー形成部の断面を、鋳造方向に向けて同一形状とすることもできる。
　更に、前記実施例においては、短辺に冷却水用通水穴（冷却水用通水溝）を形成した場合について説明したが、冷却水用通水穴は必要に応じて（チャンファー形成部の冷却状態に応じて）形成しなくてもよい。 Although the present invention has been described above with reference to Examples, the present invention is not limited to the configuration described in the above-described Examples, but is within the scope of the claims. It also includes other possible examples and modifications. For example, the case where a part or all of the above-mentioned Examples and Modifications are combined to form a mold for continuous casting of the present invention is also included in the scope of rights of the present invention.
The continuous casting mold shown in the above embodiment can be used in a conventionally used vertical bending type continuous casting machine or curved type continuous casting machine.
Further, in the above embodiment, the case where the inclined portion is formed in the chamfer forming portion has been described, but the present invention is not limited to this, and for example, the cross section of the chamfer forming portion has the same shape in the casting direction. It can also be.
Further, in the above embodiment, the case where the cooling water passage hole (cooling water passage groove) is formed on the short side has been described, but the cooling water passage hole is provided as necessary (chamber forming portion). It does not have to be formed (depending on the cooling state of).
　本発明の連続鋳造用鋳型は、チャンファー形成部の端部の剛性を、従来と比較して向上でき、また、その表面に形成された耐摩耗性の皮膜の損傷や欠け等も、従来と比較して低減できる。これにより、従来よりも長寿命化が図れると共に、良好な品質の鋳片を歩留りよく製造できる。 The mold for continuous casting of the present invention can improve the rigidity of the end portion of the chamfer forming portion as compared with the conventional one, and the wear-resistant film formed on the surface thereof is also damaged or chipped as compared with the conventional one. It can be reduced in comparison. As a result, the life can be extended as compared with the conventional one, and slabs of good quality can be produced with good yield.
１０、１０ａ、１０ｂ：連続鋳造用鋳型、１１、１１ａ、１１ｂ：短辺、１２：長辺、１３、１３ａ、１３ｂ：鋳型空間部、１４、１４ａ、１４ｂ：鋳型壁、１５、１５ａ、１５ｂ：チャンファー形成部、１６、１６ａ、１７、１７ａ：直線部、１８、１８ａ：連接部分、１９：曲線部 10, 10a, 10b: Mold for continuous casting, 11, 11a, 11b: Short side, 12: Long side, 13, 13a, 13b: Mold space, 14, 14a, 14b: Mold wall, 15, 15a, 15b: Chamfer forming part, 16, 16a, 17, 17a: straight part, 18, 18a: connecting part, 19: curved part

Claims (5)

  1. 　間隔を有して対向配置される一対の短辺と、該短辺を幅方向の両側から挟む一対の長辺とによって囲繞される鋳型空間部を有し、前記一対の短辺と前記一対の長辺とからなり、前記鋳型空間部を形成する鋳型壁の四隅の領域の前記短辺に、前記鋳型空間部側へ向けて膨出するチャンファー形成部が設けられ、前記鋳型空間部に溶鋼を注入して冷却し鋳片として引き抜く連続鋳造用鋳型において、
    　前記チャンファー形成部の前記鋳型空間部側の表面は、水平断面が前記鋳型空間部側へ向けて膨出するように形成された複数の連続した直線部で構成され、前記長辺の前記鋳型空間部側の表面に対する、前記長辺に当接又は近接する前記直線部のなす角が６０度超９０度未満であり、
    　前記チャンファー形成部の前記鋳型空間部側の表面に耐摩耗性の皮膜が形成されていることを特徴とする連続鋳造用鋳型。     It has a mold space portion surrounded by a pair of short sides arranged to face each other with a gap and a pair of long sides sandwiching the short sides from both sides in the width direction, and the pair of short sides and the pair. A chamfer forming portion that is composed of a long side and bulges toward the mold space portion is provided on the short side of the four corner regions of the mold wall that forms the mold space portion, and molten steel is provided in the mold space portion. In a continuous casting mold that injects, cools, and pulls out as a slab.
    The surface of the chamfer forming portion on the mold space side is composed of a plurality of continuous straight portions formed so that the horizontal cross section bulges toward the mold space side, and the mold on the long side is formed. The angle formed by the straight line portion in contact with or close to the long side with respect to the surface on the space portion side is more than 60 degrees and less than 90 degrees.
    A mold for continuous casting, characterized in that a wear-resistant film is formed on the surface of the chamfer forming portion on the mold space side.
  2. 　間隔を有して対向配置される一対の短辺と、該短辺を幅方向の両側から挟む一対の長辺とによって囲繞される鋳型空間部を有し、前記一対の短辺と前記一対の長辺とからなり、前記鋳型空間部を形成する鋳型壁の四隅の領域の前記短辺に、前記鋳型空間部側へ向けて膨出するチャンファー形成部が設けられ、前記鋳型空間部に溶鋼を注入して冷却し鋳片として引き抜く連続鋳造用鋳型において、
    　前記チャンファー形成部の前記鋳型空間部側の表面は、水平断面が前記鋳型空間部側へ向けて膨出するように形成された複数の連続した直線部で構成され、しかも、該複数の直線部の連接部分のうち、少なくとも前記長辺に当接又は近接する前記直線部に形成された前記連接部分が、前記鋳型空間部側へ向けて膨出する曲線部で構成され、
    　前記チャンファー形成部の前記鋳型空間部側の表面に耐摩耗性の皮膜が形成されていることを特徴とする連続鋳造用鋳型。     It has a mold space portion surrounded by a pair of short sides arranged to face each other with a gap and a pair of long sides sandwiching the short sides from both sides in the width direction, and the pair of short sides and the pair. A chamfer forming portion that is composed of a long side and bulges toward the mold space portion is provided on the short side of the four corner regions of the mold wall that forms the mold space portion, and molten steel is provided in the mold space portion. In a continuous casting mold that injects, cools, and pulls out as a slab.
    The surface of the chamfer forming portion on the mold space side is composed of a plurality of continuous straight lines formed so that the horizontal cross section bulges toward the mold space side, and the plurality of straight lines. Of the connecting portions of the portions, the connecting portion formed on the straight portion that is in contact with or close to the long side is composed of a curved portion that bulges toward the mold space portion side.
    A mold for continuous casting, characterized in that a wear-resistant film is formed on the surface of the chamfer forming portion on the mold space side.
  3. 　間隔を有して対向配置される一対の短辺と、該短辺を幅方向の両側から挟む一対の長辺とによって囲繞される鋳型空間部を有し、前記一対の短辺と前記一対の長辺とからなり、前記鋳型空間部を形成する鋳型壁の四隅の領域の前記短辺に、前記鋳型空間部側へ向けて膨出するチャンファー形成部が設けられ、前記鋳型空間部に溶鋼を注入して冷却し鋳片として引き抜く連続鋳造用鋳型において、
    　前記チャンファー形成部の前記鋳型空間部側の表面は、水平断面が前記鋳型空間部側へ向けて膨出するように形成された曲線部で構成され、
    　前記チャンファー形成部の前記鋳型空間部側の表面に耐摩耗性の皮膜が形成されていることを特徴とする連続鋳造用鋳型。     It has a mold space portion surrounded by a pair of short sides arranged to face each other with a gap and a pair of long sides sandwiching the short sides from both sides in the width direction, and the pair of short sides and the pair. A chamfer forming portion that is composed of a long side and bulges toward the mold space portion is provided on the short side of the four corner regions of the mold wall that forms the mold space portion, and molten steel is provided in the mold space portion. In a continuous casting mold that injects, cools, and pulls out as a slab.
    The surface of the chamfer forming portion on the mold space side is composed of a curved portion formed so that the horizontal cross section bulges toward the mold space side.
    A mold for continuous casting, characterized in that a wear-resistant film is formed on the surface of the chamfer forming portion on the mold space side.
  4. 　請求項１～３のいずれか１項に記載の連続鋳造用鋳型において、対向する前記短辺に形成した前記チャンファー形成部には、前記鋳片が引き抜かれる方向に鋳片シェルの凝固収縮量に追従して間隔が徐々に狭まる傾斜部が形成されていることを特徴とする連続鋳造用鋳型。 In the continuous casting mold according to any one of claims 1 to 3, the amount of solidification shrinkage of the slab shell in the direction in which the slab is pulled out from the chamfer forming portion formed on the opposite short side. A mold for continuous casting, characterized in that an inclined portion is formed in which the interval gradually narrows in accordance with the above.
  5. 　請求項１～４のいずれか１項に記載の連続鋳造用鋳型において、前記皮膜は溶射皮膜又はめっき皮膜であることを特徴とする連続鋳造用鋳型。 The continuous casting mold according to any one of claims 1 to 4, wherein the film is a thermal spray coating or a plating film.
PCT/JP2020/004925 2020-02-07 2020-02-07 Continuous casting mold WO2021157083A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2020521614A JP6817498B1 (en) 2020-02-07 2020-02-07 Mold for continuous casting
PCT/JP2020/004925 WO2021157083A1 (en) 2020-02-07 2020-02-07 Continuous casting mold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/004925 WO2021157083A1 (en) 2020-02-07 2020-02-07 Continuous casting mold

Publications (1)

Publication Number Publication Date
WO2021157083A1 true WO2021157083A1 (en) 2021-08-12

Family

ID=74164622

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/004925 WO2021157083A1 (en) 2020-02-07 2020-02-07 Continuous casting mold

Country Status (2)

Country Link
JP (1) JP6817498B1 (en)
WO (1) WO2021157083A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4868423A (en) * 1971-12-22 1973-09-18
JPS5075122A (en) * 1973-11-07 1975-06-20
JPS58205654A (en) * 1982-05-25 1983-11-30 Mishima Kosan Co Ltd Short side casting mold for continuous casting
JPH0639246U (en) * 1992-11-06 1994-05-24 株式会社神戸製鋼所 Mold for continuous casting with variable width
JP3176975U (en) * 2011-05-03 2012-07-12 セントラル アイロン アンド スチール リサーチ インスティテュート Chamfered short side copper plate for mold with funnel-shaped curved surface
JP2015128776A (en) * 2014-01-06 2015-07-16 三島光産株式会社 Continuous casting mold

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4868423A (en) * 1971-12-22 1973-09-18
JPS5075122A (en) * 1973-11-07 1975-06-20
JPS58205654A (en) * 1982-05-25 1983-11-30 Mishima Kosan Co Ltd Short side casting mold for continuous casting
JPH0639246U (en) * 1992-11-06 1994-05-24 株式会社神戸製鋼所 Mold for continuous casting with variable width
JP3176975U (en) * 2011-05-03 2012-07-12 セントラル アイロン アンド スチール リサーチ インスティテュート Chamfered short side copper plate for mold with funnel-shaped curved surface
JP2015128776A (en) * 2014-01-06 2015-07-16 三島光産株式会社 Continuous casting mold

Also Published As

Publication number Publication date
JP6817498B1 (en) 2021-01-20
JPWO2021157083A1 (en) 2021-08-12

Similar Documents

Publication Publication Date Title
JP4659706B2 (en) Continuous casting mold
JP4294216B2 (en) Improved contact mold for continuous casting of steel slabs.
JP6085571B2 (en) Continuous casting mold
JPH11267794A (en) Casting mold cooled by liquid
JP5180876B2 (en) Continuous casting mold
WO2021157083A1 (en) Continuous casting mold
JP6365604B2 (en) Steel continuous casting method
JP6787359B2 (en) Continuous steel casting method
KR20140020544A (en) Casting mold
CN102470426A (en) Casting mold
CN109843473B (en) Continuous casting mold and method for continuous casting of steel
JP5463189B2 (en) Method for repairing continuous casting mold and repaired continuous casting mold
US7891405B2 (en) Water-cooling mold for metal continuous casting
JP5566972B2 (en) Continuous casting mold
US20010017199A1 (en) Continuous casting mold and processes for making and retrofitting
JP5525966B2 (en) Continuous casting mold
JP5525925B2 (en) Continuous casting mold
JP5525896B2 (en) Continuous casting mold
JP5148472B2 (en) Continuous casting mold
CN110000348B (en) Hyperbolic funnel-shaped crystallizer wide-surface copper plate and preparation method thereof
JP5624007B2 (en) Continuous casting method
KR100910459B1 (en) Mold for Continuous Casting Steel
JP6900700B2 (en) Mold for continuous casting of steel and continuous casting method of steel slabs
JPH07284896A (en) Method for continuously casting steel and mold for continuous casting
JP5639960B2 (en) Continuous casting mold

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2020521614

Country of ref document: JP

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20917649

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20917649

Country of ref document: EP

Kind code of ref document: A1