WO2022054806A1 - Procédé de laminage à froid, équipement de laminage à froid et procédé de fabrication de tôle d'acier laminée à froid - Google Patents

Procédé de laminage à froid, équipement de laminage à froid et procédé de fabrication de tôle d'acier laminée à froid Download PDF

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Publication number
WO2022054806A1
WO2022054806A1 PCT/JP2021/032889 JP2021032889W WO2022054806A1 WO 2022054806 A1 WO2022054806 A1 WO 2022054806A1 JP 2021032889 W JP2021032889 W JP 2021032889W WO 2022054806 A1 WO2022054806 A1 WO 2022054806A1
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Prior art keywords
stand
rolled
work roll
taper
rolling
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PCT/JP2021/032889
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English (en)
Japanese (ja)
Inventor
好規 生駒
悦充 原田
優 長井
行宏 松原
昇輝 藤田
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Ｊｆｅスチール株式会社
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.)
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to CN202180051657.9A priority Critical patent/CN115968325A/zh
Priority to KR1020237005232A priority patent/KR20230039703A/ko
Priority to MX2023002879A priority patent/MX2023002879A/es
Priority to JP2021565792A priority patent/JP7156557B2/ja
Priority to EP21866765.7A priority patent/EP4212260A4/fr
Priority to US18/021,400 priority patent/US20240033795A1/en
Publication of WO2022054806A1 publication Critical patent/WO2022054806A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • 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
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/142—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B2001/221—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 plates, strips, bands or sheets of indefinite length by cold-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/40—Control of flatness or profile during rolling of strip, sheets or plates using axial shifting of the rolls

Definitions

  • the present invention relates to a cold rolling method for cold rolling a material to be rolled, a cold rolling facility, and a method for manufacturing a cold-rolled steel sheet.
  • plate breakage may occur due to various factors during cold rolling of the material to be rolled.
  • One reason for this plate breakage is that the plate breaks due to ear cracks starting from the cracks generated by the high tension applied to the edge portion due to the poor distribution of the plate thickness in the plate width direction of the material to be rolled (for example, edge drop). This is the case.
  • edge drop is a phenomenon of a rapid decrease in plate thickness at both ends in the plate width direction among the plate thickness deviations in the plate width direction that occur in the plate material during rolling.
  • a method for controlling the plate thickness in the width direction shown in Patent Document 1 has been proposed as a method for reducing the amount of edge drop and improving the plate thickness distribution in the plate width direction.
  • the widthwise plate thickness of the plate material is controlled by a rolling mill provided in a plurality of stands with a mechanism for shifting a work roll having a taper at the end of the roll and a mechanism for crossing the work roll.
  • the control can be accurately shared by a plurality of stands, and the plate width is generated from the gentle plate thickness deviation generated from the center of the plate width toward the plate end side.
  • a good plate thickness distribution can be obtained over the entire plate width up to the plate thickness deviation (edge drop) that occurs due to a sudden decrease at the end.
  • the method for controlling the thickness of the plate material in the width direction shown in Patent Document 1 has the following problems. That is, although the method for controlling the plate thickness in the width direction shown in Patent Document 1 is to obtain a good plate thickness distribution over the entire plate width, according to the test by the present inventors, cold rolling is in progress. It was found that the occurrence of ear cracks in the material to be rolled could not be sufficiently suppressed and the plate breakage during cold rolling could not be sufficiently suppressed.
  • the present invention has been made to solve this conventional problem, and an object thereof is to prevent plate breakage by sufficiently suppressing the occurrence of ear cracks in the rolling target material during cold rolling. It is an object of the present invention to provide a cold rolling method, a cold rolling facility, and a method for manufacturing a cold-rolled steel sheet.
  • the cold rolling method is a cold rolling method for cold rolling a material to be rolled by a rolling mill provided with a plurality of stands, and the cold rolling method of the plurality of stands.
  • the Nth stand arranged at the Nth position (N is a natural number of 2 or more) from the upstream side in the transport direction of the material to be rolled has a tapered work roll in which a taper is formed at the end of a roll having a uniform diameter.
  • the gist of the Nth stand is to roll the material to be rolled with a linear load of 0.8 t / mm or more.
  • the cold rolling method is a cold rolling method in which a rolling target material is cold-rolled by a rolling mill provided with a plurality of stands, and among the plurality of stands, the rolling target.
  • the Nth stand arranged at the Nth position (N is a natural number of 2 or more) from the upstream side in the material transport direction and the N + 1th position arranged at the N + 1th position on the downstream side of the Nth stand are rolls having a uniform diameter. It has a tapered work roll with a taper formed at the end, and the Nth stand and the N + 1 stand have a linear load of 1.7 t / mm or more, respectively, and the Nth stand and the N + 1 stand have a linear load.
  • the gist is to roll the rolling target material by setting the taper rolling portion width WR ⁇ , which is the length of the taper formed on each of the tapered work rolls and facing the rolling target material, to be between -50 mm and -5 mm. And.
  • the cold rolling equipment is a cold rolling equipment provided with a rolling mill having a plurality of stands for cold rolling the material to be rolled, and among the plurality of stands, the cold rolling equipment is provided.
  • the Nth stand arranged at the Nth position (N is a natural number of 2 or more) from the upstream side in the transport direction of the material to be rolled has a tapered work roll having a taper formed at the end of a roll having a uniform diameter.
  • the gist is that the linear load of the Nth stand is set to 0.8 t / mm or more.
  • the cold rolling equipment is a cold rolling equipment provided with a rolling mill having a plurality of stands for rolling the material to be rolled, and the rolling of the plurality of stands.
  • the Nth stand arranged at the Nth position (N is a natural number of 2 or more) from the upstream side in the transport direction of the target material and the N + 1th stand arranged at the N + 1th position on the downstream side of the Nth stand have uniform diameters.
  • It has a tapered work roll having a taper formed at the end of the roll, and the linear load of the Nth stand and the N + 1 stand is set to 1.7 t / mm or more, respectively, and the Nth stand and the said.
  • the gist is that the width WR ⁇ of the tapered rolled portion, which is the length of the taper formed on each of the tapered work rolls of the N + 1 stand and faces the material to be rolled, is between -50 mm and -5 mm.
  • the method for manufacturing a cold-rolled steel sheet according to another aspect of the present invention is based on the gist of cold-rolling a steel sheet by the above-mentioned cold-rolled method to manufacture a cold-rolled steel sheet.
  • plate breakage is suppressed by sufficiently suppressing the occurrence of ear cracks in the material to be rolled during cold rolling. Can be done.
  • FIG. 1st Embodiment of this invention It is a schematic block diagram of the cold rolling equipment which concerns on 1st Embodiment of this invention. It is a figure for demonstrating the taper work roll in the cold rolling equipment shown in FIG. It is a figure for demonstrating the edge drop ratio. It is a figure for demonstrating edge up.
  • the work roll of the 2nd stand is a taper work roll
  • the work rolls of the 1st stand, the 3rd stand, and the 4th stand are flat work rolls
  • each stand rolls a steel plate with a linear load of 1.4 t / mm It is a graph which shows the edge drop ratio in each stand in the case of.
  • the tapered rolled portion width WR ⁇ of the tapered work roll of the 2nd stand is +20 mm. , + 50 mm, ⁇ 5 mm, and + 60 mm, and the graph shows a comparison of the edge drop ratios at each stand when the steel sheet is rolled with a linear load of 1.25 t / mm.
  • the tapered rolled portion width WR ⁇ of the tapered work roll of the 2nd stand is +20 mm. , + 50 mm, ⁇ 5 mm, and + 60 mm, and the graph shows a comparison of the edge drop ratios at each stand when the steel sheet is rolled with a linear load of 1.35 t / mm.
  • the tapered rolled portion width WR ⁇ of the tapered work roll of the 2nd stand is-. It is a graph which compares and shows the edge drop ratio in each stand when the steel plate is rolled with the linear load of 1.45 t / mm by changing each stand into 20 mm, -50 mm, + 5 mm, and -60 mm.
  • the tapered rolled portion width WR ⁇ of the tapered work roll of the 2nd stand is-. It is a graph which compares and shows the edge drop ratio in each stand when the steel plate is rolled with the linear load of 1.60t / mm by changing to 20mm, -50mm, + 5mm, -60mm. It is a schematic block diagram of the cold rolling equipment which concerns on 2nd Embodiment of this invention.
  • each stand rolls a steel material with a linear load of 1.7 t / m. It is a graph which shows the edge drop ratio in a stand.
  • FIG. 1 shows a schematic configuration of a cold rolling equipment according to a first embodiment of the present invention.
  • the cold rolling equipment 1 shown in FIG. 1 includes a rolling mill (tandem rolling mill) 2 having a plurality of ( four in this embodiment) stands 3 1 to 34.
  • the rolling mill 2 cold-rolls the steel sheet S (see FIG. 2) as the rolling target material.
  • the steel sheet S is rolled by the rolling mill 2 while being conveyed from the upstream side to the downstream side of the cold rolling equipment 1.
  • the stands were arranged on the downstream side of the first stand 3 1 first from the upstream side in the transport direction of the steel plate S, the second stand 3 2 arranged on the downstream side of the first stand 3 1 , and the second stand 3 2 .
  • the number of stands is not limited to four, and may be multiple.
  • the subscript of each stand indicates the arrangement order of the steel plate S from the upstream side in the transport direction, and the stand arranged in the Nth position (N is a natural number of 2 or more) from the upstream side in the transport direction of the steel plate S is the Nth stand 3.
  • the stands arranged in the N , N + 1th position are called the N + 1th stand 3 N + 1 , ...
  • the Nth stand 3 N is written in parentheses on the second stand 32
  • the N + 1 stand 3 N + 1 is written in parentheses on the third stand 3 3 .
  • Each of the first stand 3 1 to the fourth stand 3 4 has a pair of upper and lower work rolls 4a for rolling the steel plate S as a rolling target material, a pair of upper and lower backup rolls 4b for supporting these work rolls 4a, and each work. It includes a pair of upper and lower intermediate rolls 4c arranged between the rolls 4a and each backup roll 4b.
  • Each work roll 4a of the second stand 3 2 is composed of a tapered work roll 4a 1 (hatched in FIG. 1), and the first stand 3 1 and the third stand 3 3 other than the second stand 3 2 are formed.
  • each work roll 4a of the fourth stand 34 is composed of a flat work roll 4a2 (no diagonal line in FIG. 1).
  • the configurations of the taper work roll 4a1 and the flat work roll 4a2 will be described later. As described above, the reason why each work roll 4a of the second stand 32 2 is composed of the taper work roll 4a1 will be described below.
  • a rolling mill tandem rolling mill 2 having four first stands 31 to fourth stands 34 as shown in FIG.
  • the work rolls 4a of the first stand 3 1 and the fourth stand 34 among the four first stands 3 1 to the fourth stand 3 4 were designated as taper work rolls 4a1 and the second.
  • the work rolls 4a of the stands 3 2 and the third stand 3 3 were designated as flat work rolls 4a2.
  • the edge drop ratios in each of the first stand 31 to the fourth stand 34 were investigated.
  • the edge drop refers to a phenomenon of a rapid decrease in plate thickness, particularly at both ends in the plate width direction, among the plate thickness deviations in the plate width direction that occur in the steel plate S during rolling.
  • the edge drop ratio is the following equation when the plate thickness of the steel plate S 5 mm from both end faces in the plate width direction is E5 and the plate thickness 20 mm from both end faces is E20. It is represented by.
  • Edge drop ratio Ed (E5-E20) / E20
  • edge-up which is known as a plate thickness deviation in contrast to edge drop, is a phenomenon of a rapid increase in plate thickness at both ends in the plate width direction among the plate thickness deviations in the plate width direction that occur in the steel plate S during rolling. That's what it says.
  • the edge-up amount is calculated by the following equation when the plate thickness of the steel plate S 5 mm from both end faces in the plate width direction is E5 and the plate thickness 20 mm from both end faces is E20. expressed.
  • Edge-up amount Eu E5-E20
  • the reference numeral CL indicates the center line of the steel plate S in the width direction.
  • an increase in the edge drop ratio means that the numerical value of the edge drop ratio increases on the negative side
  • a decrease in the edge drop ratio means that the numerical value of the edge drop ratio decreases on the negative side. That is, if the difference between the edge drop ratio at the 4th stand 3 4 and the edge drop ratio at the 3rd stand 3 3 is large (the difference is 0.02 or more on the + side), plate breakage is likely to occur. It turned out.
  • the edge drop ratio at the first stand 3 1 , the second stand 3 2 , the third stand 3 3 , and the fourth stand 3 4 can be within an appropriate range, and the edge at the fourth stand 3 4 can be set.
  • the difference between the drop ratio and the edge drop ratio at the 3rd stand 3 3 becomes smaller, the tension applied to the edge portion at the 3rd stand 3 3 on the downstream side is reduced, and the cracking of the steel plate can be suppressed. I got the finding that there is no such thing.
  • each work roll 4a of the second stand 32 2 is composed of a taper work roll 4a1.
  • the occurrence of excessive edge drop is suppressed by performing rolling with the taper work roll 4a1 on the second stand 32, and even if rolling with the flat work roll on the subsequent third stand 3 3 is performed on the edge portion. It was found that the tension was reduced and the occurrence of cracks was suppressed.
  • the fracture caused by the crack at the edge portion of the electrical steel sheet was reduced.
  • the work roll 4a of the second stand 3 2 is a tapered work roll 4a 1 (described later, the tapered rolled portion width WR ⁇ of the second stand 3 2 is between -50 mm and -5 mm), and the others.
  • the work rolls 4a of the stands 3 1 , 3 , 3, and 4 are flat work rolls 4a2
  • each of the first stands 3 1 to the fourth stands 3 4 rolls the steel plate S with a linear load of 1.4 t / mm.
  • the edge drop ratio in each of the 1st stand 3 1 to the 4th stand 3 4 is shown. As shown in FIG.
  • the edge drop ratio does not increase significantly from the first stand 3 1 to the fourth stand 3 4 and falls within an appropriate range. It was found that the difference between the edge drop ratio at the 4th stand 34 and the edge drop ratio at the 3rd stand 3 3 was less than 0.02.
  • FIG. 6 shows a plate crown on each exit side of the second stand 3 2 and the third stand 3 3 when the work roll 4a of the second stand 3 2 and the third stand 3 3 is a flat work roll 4a 2 . It is shown. Further, in FIG. 7, when the work roll 4a of the second stand 3 2 and the third stand 3 3 is a flat work roll 4a 2, the second stand 3 2 and the third stand 3 3 are on the respective exit sides. Tension is shown. As shown in FIG. 6, when the flat work roll 4a2 is applied to the second stand 3 2 and the third stand 3 3 , excessive edge drop occurs in the second stand 32. On the other hand, the edge drop ratio increased significantly from the second stand 3 2 to the third stand 3 3 , and as shown in FIG. 7, the third stand 3 3 became overtensioned.
  • FIG. 8 when the work roll 4a of the second stand 3 2 is a taper work roll 4a1 and the work roll 4a of the third stand 3 3 is a flat work roll 4a 2, the second stand 3 2 and the third stand 3 2 and 3 The plate crowns on the respective exits of the stands 3 and 3 are shown.
  • FIG. 9 when the work roll 4a of the second stand 3 2 is a taper work roll 4a1 and the work roll 4a of the third stand 3 3 is a flat work roll 4a 2, the second stand 3 2 and the third stand 3 2 and 3 The tension on each exit side of the stand 3 3 is shown.
  • the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 32 is preferably between ⁇ 0 mm and +50 mm.
  • the taper rolled portion width WR ⁇ will be described in detail later, but the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 3 2 is set as a negative value, that is, the taper work roll 4a1 of the second stand 3 2 is used.
  • the steel plate S When the steel plate S is rolled by shifting it in the negative direction, the steel plate S is edged up on the shifted second stand 32 on the contrary, and ear cracking or breakage occurs.
  • the steel plate S cannot be passed through the next step (annealing step), and there is a high possibility that the steel plate S will crack due to annealing. It is preferable to roll the steel sheet S by shifting to.
  • the tapered work roll 4a1 of the second stand 3 2 is shifted in the positive direction, if the tapered rolled portion width WR ⁇ of the tapered work roll 4a1 of the second stand 3 2 is made larger than +50 mm, the shifted second stand 3 Since the steel plate S may edge up at the third stand 3 3 next to 2 and crack or break may occur, the upper limit of the tapered rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 3 2 is +50 mm. Is preferable.
  • the work roll 4a of the second stand 32 is the tapered work roll 4a1
  • the first stand 3 1 and the third stand 3 3 and the work roll 4a of the fourth stand 3 4 are flat work rolls 4a2.
  • the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand is changed to +20 mm, +50 mm, -5 mm, and +60 mm, and each stand rolls a steel plate with a linear load of 1.25 t / mm. Shown by comparing the edge drop ratios on the stand.
  • the tapered work roll 4a1 of the second stand 32 When the steel sheet S is rolled with the tapered rolled portion width WR ⁇ set to -5 mm outside the range, the second stand 32 2 shifted in the negative direction is edged up, and the tapered rolled portion width WR ⁇ is set to +60 mm outside the range to set the steel plate S. When rolled, it can be seen that the second stand 3 2 next to the second stand 3 2 shifted in the plus direction is edged up. When the steel sheet S is rolled with the taper rolled portion width WR ⁇ set to +20 mm and +50 mm within the range, the second stand 32, the third stand 3 3 3 , the fourth stand 3 4 and the edge drop are appropriately promoted. I understand.
  • the work roll 4a of the second stand 3 2 is a tapered work roll 4a 1
  • the first stand 3 1 , the third stand 3 3 and the work roll 4a of the fourth stand 3 4 are flat works.
  • the taper work roll 4a1 of the second stand has a tapered rolled portion width WR ⁇ of +20 mm, +50 mm, -5 mm, and +60 mm, and each stand rolls a steel plate with a linear load of 1.35 t / mm. The edge drop ratios at each stand are shown in comparison.
  • the tapered work roll 4a1 of the second stand 3 2 when the second stand 3 2 having the tapered work roll 4a1 rolls the steel sheet S with a linear load of 1.35 t / mm, the tapered work roll 4a1 of the second stand 3 2 When the steel sheet S is rolled with the tapered rolled portion width WR ⁇ set to -5 mm outside the range, the edge is raised by the second stand 32 shifted in the negative direction, and the tapered rolled portion width WR ⁇ is set to +60 mm outside the range to set the steel plate S. When is rolled, it can be seen that the edge is raised at the second stand 3 3 following the second stand 3 2 shifted in the positive direction.
  • the lower limit of the linear load at which the steel plate S is cracked is 0.8 t / mm. In other words, when the steel sheet S is rolled with a linear load of less than 0.8 t / mm, ear cracking of the steel sheet S does not occur regardless of the shift direction of the second stand 32.
  • the steel plate S is edged up and cracks or breaks occur.
  • the above-mentioned “It was found that if the difference between the edge drop ratio at the 4th stand 3 4 and the edge drop ratio at the 3rd stand 3 3 is large, the plate breakage is likely to occur” is "shifted first.”
  • 2 Stands 3 2 The steel plate S is edged up at the next stand (4th stand 3 4 ), causing ear cracking or breakage. "
  • ear cracking the steel sheet S cannot be passed through the next step (annealing step), and there is a high possibility that the steel sheet S will be cracked by annealing.
  • the shifted second stand 32 2 creates too many edge drops (excessive edge drops occur).
  • the edge of the steel plate S cannot be rolled down by the stand (3rd stand 3 3 ), and the ear cracks occur due to the increase in tension. Therefore, it is preferable to roll the steel sheet S by shifting the second stand 32 in the negative direction.
  • the steel plate S at the shifted second stand 3 2 It is preferable to set the lower limit of the tapered rolled portion width WR ⁇ of the tapered work roll 4a1 of the second stand 32 to -50 mm because the edge may be raised and cracks or breaks may occur.
  • the work roll 4a of the second stand 3 2 is a tapered work roll 4a1
  • the first stand 3 1 and the third stand 3 3 and the work roll 4a of the fourth stand 3 4 are flat work rolls 4a2.
  • the taper rolled portion width WR ⁇ of the tapered work roll 4a1 of the second stand is changed to -20 mm, -50 mm, + 5 mm, and -60 mm, and each stand rolls a steel plate with a linear load of 1.45 t / mm.
  • the edge drop ratios at each stand are shown in comparison.
  • the work roll 4a of the second stand 32 2 is a tapered work roll 4a 1, the first stand 3 1 , the third stand 3 3 and the work roll 4a of the fourth stand 3 4 are flat works.
  • the taper rolled portion width WR ⁇ of the tapered work roll 4a1 of the second stand is changed to -20 mm, -50 mm, + 5 mm, and -60 mm, and each stand rolls the steel plate with a linear load of 1.60 t / mm.
  • the edge drop ratios at each stand are shown in comparison.
  • the work roll 4a of the second stand 3 2 is composed of the tapered work roll 4a 1, and the second stand 3 2 having the tapered work roll 4a 1 rolls the steel plate S with a linear load of 0.8 t / mm or more. do.
  • the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 3 2 is set to be between ⁇ 0 mm and +50 mm. Roll the steel plate S.
  • the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 32 is set between -50 mm and -5 mm.
  • the steel plate S is rolled. It was found that this can appropriately control both edge drop and edge up, and suppress the occurrence of ear cracks.
  • the linear load of the second stand 3 2 having the taper work roll 4a1 is shifted in the positive direction or in the negative direction with the taper work roll 4a1 of the second stand 3 2 as a boundary at 1.4 t / mm.
  • the material to be rolled is a high load material and the taper work roll 4a1 is easily bent, so that the taper work Excessive edge drop is suppressed by shifting the roll 4a1 in the negative direction.
  • the linear load of the second stand 32 having the taper work roll 4a1 is set to less than 1.4 t / mm, the material to be rolled is a low load material, and the taper work roll 4a1 is less likely to bend and edge-up occurs. Since it is likely to occur, the taper work roll 4a1 is shifted in the plus direction to bring it to the edge drop side.
  • the taper work roll 4a1 has a tapered 4ab formed at the end of the roll 4aa having a uniform diameter in the body length direction.
  • the work roll 4a as the taper work roll 4a1 is configured to be rotatable in the axial direction (roll body length direction, steel plate S plate width direction).
  • the taper rolled portion width WR ⁇ of the taper work roll 4a1 is the length of the taper 4ab facing the steel plate S, and is the length from the taper start end 4ac to the end face in the width direction of the steel plate S in FIG.
  • the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 32 2 is ⁇ 0 mm or more.
  • the steel plate S is rolled so that it is between +50 mm. That is, it is preferable to roll the steel plate S by shifting the taper work roll 4a1 of the second stand 32 in the positive direction.
  • the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 32 2 is -50 mm or more. Roll the steel plate S between -5 mm. That is, it is preferable to roll the steel plate S by shifting the taper work roll 4a1 of the second stand 32 in the minus direction.
  • the width WR ⁇ of the tapered rolled portion is defined as ⁇ when the widthwise end face of the steel sheet S protrudes from the taper start end 4ac, and + when the widthwise end face of the steel sheet S retracts from the taper start end 4ac.
  • the taper rolled portion width WR ⁇ is +, it is the same as when the flat work roll 4a2 is adopted.
  • the inclination of the taper 4ab is such that the length from the taper start end 4ac to the taper end surface (the axial end surface of the taper work roll 4a1) is L, and the height difference between the outer peripheral surface of the roll 4aa and the outer periphery of the taper end surface. Is H, it can be expressed as L / H.
  • the inclination L / H of the taper 4ab is preferably 1/800 to 1/400. If the inclination L / H of the taper 4ab is smaller than 1/800, there is a problem that edge drop cannot be suppressed.
  • the flat work roll 4a2 is composed of rolls having a uniform diameter in the body length direction.
  • the work roll 4a as the flat work roll 4a2 is configured to be rotatable in the axial direction (roll body length direction, steel plate S plate width direction).
  • the steel sheet S as the rolling target material is the second from the upstream side in the transport direction.
  • the second stand 3 2 arranged in the second stand 3 2 has a tapered work roll 4a 1 in which a taper 4 ab is formed at an end portion of the roll 4 aa having a uniform diameter.
  • the linear load of the second stand 32 is set to 0.8 t / mm or more.
  • the taper rolled portion width WR ⁇ of the tapered work roll 4a1 of the second stand 32 is set to be between ⁇ 0 mm and +50 mm.
  • the taper rolled portion width WR ⁇ of the tapered work roll 4a1 of the second stand 32 is set to be between -50 mm and -5 mm.
  • the edge drop ratio in the 1st stand 3 1 to the 4th stand 3 4 is kept within an appropriate range, and the occurrence of ear cracks in the steel plate S as a rolling target material during cold rolling is sufficiently suppressed, so that the plate breaks. Can be deterred.
  • the third stand arranged on the downstream side of the second stand 3 2 is the third stand.
  • 3 3 has a flat work roll 4a2 having a uniform roll diameter. This has the effect of promoting edge drop.
  • the first stand 3 1 arranged at the uppermost stream has a flat work roll 4a2. Although it has, it may have a taper work roll 4a1. This has the effect of suppressing edge drop.
  • the steel plate S as a rolling target material is cold-rolled by the rolling mill 2 in the cold rolling equipment 1 shown in FIG.
  • the second stand 3 2 arranged second from the upstream side in the transport direction of the steel plate S is the end of the roll 4aa having a uniform diameter. It has a taper work roll 4a1 having a taper 4ab formed in a portion thereof, and the second stand 32 2 rolls a steel plate S with a linear load of 0.8 t / mm or more.
  • the second stand 3 2 rolls the steel plate S with a linear load of less than 1.4 t / mm, the length of the taper 4ab formed on the taper work roll 4a1 of the second stand 3 2 facing the steel plate S.
  • the steel sheet S is rolled with the taper rolled portion width WR ⁇ set to be between ⁇ 0 mm and +50 mm.
  • the steel sheet S is rolled with the taper rolled portion width WR ⁇ set to a range of ⁇ 50 mm to ⁇ 5 mm.
  • the edge drop ratio in the 1st stand 3 1 to the 4th stand 3 4 is kept within an appropriate range, and the occurrence of ear cracks in the steel plate S as a rolling target material during cold rolling is sufficiently suppressed, so that the plate breaks. Can be deterred.
  • the steel sheet S is cold-rolled by the cold-rolled method according to the first embodiment to manufacture a cold-rolled steel sheet.
  • FIG. 15 shows a schematic configuration of a cold rolling equipment according to a second embodiment of the present invention.
  • the same members as those in FIG. 1 are designated by the same reference numerals, and the description thereof may be omitted.
  • the second stand 3 2 is written in parentheses
  • the Nth stand 3 N is designated by the same reference numerals, and the description thereof may be omitted.
  • the second stand 3 2 is written in parentheses
  • the third stand 3 3 is written in parentheses
  • the fourth stand 3 4 is written in parentheses.
  • N + 2 stand 3 N + 2 are also shown.
  • each work roll 4a of the second stand 3 2 is composed of a tapered work roll 4a1 (shaded in FIG. 15).
  • each work roll 4a of the third stand 3 3 is composed of a tapered work roll 4a1.
  • Each work roll 4a of the first stand 3 1 and the fourth stand 3 4 is composed of a flat work roll 4a2.
  • the reason why each work roll 4a of the second stand 3 2 and each work roll 4a of the third stand 3 3 are composed of the tapered work roll 4a1 will be described below.
  • the line of the second stand 32 having the tapered work roll 4a1 (the tapered rolled portion width WR ⁇ of the second stand 32 is set to be between -50 mm and -5 mm) is 1.7 t / mm.
  • the edge drop ratio does not increase significantly from the first stand 3 1 to the fourth stand 34 and is within an appropriate range.
  • the second stand 3 2 having the taper work roll 4a1 (the taper rolled portion width WR ⁇ of the second stand 3 2 is between -50 mm and -5 mm) makes the electromagnetic steel sheet with a linear load larger than 1.7 t / mm. Similar results are obtained when rolling.
  • two consecutive tapered work rolls 4a1 (tapered rolling portion width WR ⁇ of the tapered work roll 4a1 of the second stand 32 and the tapered rolled portion of the tapered work roll 4a1 of the third stand 3 3 ).
  • the second stand 3 2 and the third stand 3 3 having a width WR ⁇ of -50 mm to -5 mm, respectively) roll an electromagnetic steel plate with a linear load of 1.7 t / mm
  • the second stand The rate of increase from the edge drop ratio in 32 to the edge drop ratio in the third stand 3 3 3 can be suppressed to be smaller than that in the case where only the work roll 4a of the second stand 3 2 is used as the taper work roll 4a 1.
  • Similar results are obtained when the second stand 3 2 and the third stand 3 3 3 3 having two consecutive tapered work rolls 4a 1 roll an electromagnetic steel sheet with a linear load larger than 1.7 t / mm.
  • each work roll of the second stand 32 2 is assumed to be rolled.
  • the 4a is composed of the tapered work roll 4a1
  • each work roll 4a of the third stand 3 3 is composed of the tapered work roll 4a1.
  • the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 3 2 and the third stand 3 2 is set to be between -50 mm and -5 mm.
  • the steel plate S as the rolling target material is the second from the upstream side in the transport direction.
  • the second stand 3 2 arranged and the third stand 3 3 arranged on the downstream side of the second stand 3 2 are tapered work rolls in which a taper 4ab is formed at the end of a roll 4aa having a uniform diameter. It has 4a1.
  • the linear load of the second stand 3 2 and the third stand 3 3 is set to 1.7 t / mm or more, and the taper work rolls 4a1 of the second stand 3 2 and the third stand 3 3 are formed.
  • the taper rolled portion width WR ⁇ which is the length of the tapered 4ab that faces the steel plate S, is set to be between -50 mm and -5 mm.
  • the edge drop ratio in the first stand 3 1 to the fourth stand 34 is kept within an appropriate range, and the occurrence of ear cracks in the steel sheet S as a rolling target material during cold rolling is more sufficiently suppressed. Breakage can be suppressed.
  • the fourth stand arranged on the downstream side of the third stand 3 3 out of the 4 first stands 3 1 to the 4th stand 3 4 is arranged.
  • 34 has a flat work roll 4a2 having a uniform roll diameter. This has the effect of promoting edge drop.
  • the first stand 3 1 arranged at the uppermost stream has a flat work roll 4a2. Although it has, it may have a taper work roll 4a1. This has the effect of suppressing edge drop.
  • the steel plate S as a rolling target material is cold-rolled by the rolling mill 2 in the cold rolling equipment 1 shown in FIG.
  • the second stand 3 2 and the third stand 3 3 are tapered with a taper 4ab formed at the end of the roll 4aa having a uniform diameter. It has a work roll 4a1.
  • the second stand 3 2 and the third stand 3 3 were formed on the tapered work rolls 4a 1 of the second stand 3 2 and the third stand 3 3 with a linear load of 1.7 t / mm or more.
  • the steel plate S is rolled with the taper rolled portion width WR ⁇ , which is the length of the taper 4ab facing the steel plate S, set to be between -50 mm and -5 mm.
  • the edge drop ratios of the first stand 3 1 to the fourth stand 3 4 are kept within an appropriate range, and the occurrence of ear cracks in the steel sheet S as a rolling target material during cold rolling is more sufficiently suppressed. It is possible to prevent plate breakage.
  • the configuration of the taper work roll 4a1 is the same as that shown in FIG. 2, and the taper work roll 4a1 has a tapered 4ab formed at the end of the roll 4aa having a uniform diameter in the body length direction.
  • the work roll 4a as the taper work roll 4a1 is configured to be rotatable in the axial direction (roll body length direction, steel plate S plate width direction).
  • the tapered rolled portion width WR ⁇ which is the length of the taper 4ab facing the steel plate S, is when the widthwise end face of the steel plate S protrudes from the taper start end 4ac-and the widthwise end face of the steel plate S is from the taper start end 4ac.
  • the steel sheet S is rolled between ⁇ 50 mm and ⁇ 5 mm as described above.
  • the inclination L / H of the taper 4ab is preferably 1/800 to 1/400 as described above.
  • each work roll 4a of the second stand 3 2 and each work roll 4a of the third stand 3 3 are set as the taper work roll 4a1. It is also possible to shift each work roll 4a in the axial direction according to the linear load and roll in a preferable manner.
  • the taper rolled portion width WR ⁇ in the second stand 32 is between ⁇ 0 mm and +50 mm, and in the third stand 32.
  • Each work roll 4a may be shifted in the axial direction so that the taper rolled portion width WR ⁇ > 0 mm, and the taper work roll 4a1 may be used as the flat work roll 4a2.
  • the tapered rolled portion width WR ⁇ is between -50 mm and -5 mm in the second stand 32, and the taper is formed in the third stand 3 3 .
  • Each work roll 4a may be axially shifted and used as the flat work roll 4a2 so that the rolled portion width WR ⁇ > 0 mm.
  • each work is provided so that the taper rolled portion width WR ⁇ in each of the second stand 32 and the third stand 3 3 is between -50 mm and -5 mm.
  • the roll 4a may be shifted in the axial direction and used as the tapered work roll 4a1. Then, in the method for manufacturing a cold-rolled steel sheet according to the second embodiment, the steel sheet S is cold-rolled by the cold-rolled method according to the second embodiment to manufacture a cold-rolled steel sheet.
  • a rolling mill (tandem rolling mill) 2 provided with four first stands 3 1 to 4 fourth stands 3 4 has been described as an example, but the number of stands is not limited to this.
  • the rolling mill 2 may be provided with five or more stands. When five or more stands are provided and the number of stands in which the work roll 4a is the taper work roll 4a1 is one as in the first embodiment, one of the stands in the previous stage is used except for the most upstream stand. Just choose the stand.
  • the number of stands having the work roll 4a as the taper work roll 4a1 is two consecutive stands as in the second embodiment, at least one of them is selected from the stands in the previous stage except for the most upstream stand. It suffices as long as it is one stand.
  • the taper work roll 4a1 is applied to the second stand 32, but this is because the rolling mill 2 of the first embodiment breaks at the third stand 3 3 . It was selected as its upstream stand.
  • the taper work roll 4a1 is applied to the second stand 3 2 and the third stand 3 3 because the third stand 3 3 breaks.
  • the taper work roll 4a1 may be applied to another stand depending on the configuration of the rolling mill (tandem rolling mill) 2.
  • the steel plate S as the material to be rolled is upstream in the transport direction.
  • N is a natural number of 2 or more
  • the Nth stand 3N arranged at the Nth position from the side has a tapered work roll 4a1 in which a taper 4ab is formed at an end of a roll 4aa having a uniform diameter.
  • the steel plate S as the rolling target material is rolled at the Nth stand 3N with a linear load of 0.8 t / mm or more.
  • the steel plate S is rolled with a linear load of less than 1.4 t / mm on the Nth stand 3N, the length of the taper 4ab formed on the taper work roll 4a1 of the Nth stand 3N facing the steel plate S. It is preferable to roll the steel sheet S with the taper rolled portion width WR ⁇ set to a range of ⁇ 0 mm to +50 mm.
  • the steel plate S when the steel plate S is rolled with a linear load of 1.4 t / mm or more on the Nth stand 3N, the length of the taper 4ab formed on the taper work roll 4a1 of the Nth stand 3N facing the steel plate S. It is preferable to roll the steel sheet S with the taper rolled portion width WR ⁇ set to a range of ⁇ 50 mm to ⁇ 5 mm. Then, in the cold rolling method, the cold rolling equipment, and the method for manufacturing a cold-rolled steel sheet according to the present invention, it is arranged at the N + 1th position on the downstream side of the Nth stand 3N among the plurality of stands 3 1 to 34. It is preferable to roll the steel plate S as the rolling target material by assuming that the N + 1 stand 3 N + 1 has a flat work roll 4a2 having a uniform roll diameter.
  • the cold rolling equipment, and the cold-rolled steel sheet manufacturing method according to the present invention among the plurality of stands 31 to 34 , the upstream side of the steel sheet S as the material to be rolled in the transport direction.
  • Roll 4aa having a uniform diameter on the N + 1th stand 3 N + 1 arranged on the downstream side of the Nth stand 3N and the Nth stand 3N arranged at the Nth position (N is a natural number of 2 or more). It is assumed that the tapered work roll 4a1 having the taper 4ab formed at the end of the roll 4a1 is provided.
  • the Nth stand 3N and the N + 1 stand 3 N + 1 were formed on the taper work rolls 4a1 of the Nth stand 3N and the N + 1 stand 3N + 1 with a linear load of 1.7t / mm or more.
  • the steel plate S is rolled with the taper rolled portion width WR ⁇ , which is the length of the taper 4ab facing the steel plate S, set to be between -50 mm and -5 mm.
  • the first N + 1 stand 3 N + 1 is arranged at the N + 2nd position on the downstream side of the plurality of stands 3 1 to 34. It is preferable to roll the steel plate S as a rolling target material by having a flat work roll 4a2 having a uniform roll diameter on the N + 2 stand 3 N + 2 . Further, in the first embodiment and the second embodiment, the electromagnetic steel sheet is used as the rolling target material in the test, but the steel type of the steel sheet S is not limited to the electromagnetic steel sheet.
  • stainless steel sheets, high carbon steel sheets, electromagnetic steel sheets and the like are known as steel grades in which ear cracks are likely to occur at edges, and the cold rolling method, cold rolling equipment, and cold rolling of the present invention can be applied to these steel grades. A remarkable effect appears by applying the method of manufacturing a steel sheet.
  • cold rolling was performed using the cold rolling equipment 1 under the conditions shown in Tables 5 and 6.
  • Tables 5 and 6 the rolling reduction ratio is calculated based on the plate thickness on the entry side of the first stand 31 and the plate thickness on the exit side of the fourth stand 34 of the material to be rolled.
  • the rolling target material is an electromagnetic steel plate A
  • the rolling target material is an electromagnetic steel plate B
  • the rolling target material is an electromagnetic steel plate C.
  • the taper work roll 4a1 is applied to the second stand 32
  • the linear load of the second stand 3 2 is 1.4 t / mm or more
  • the width of the tapered rolled portion of the taper work roll 4a1 of the second stand 3 2 WR ⁇ . was set between -50 mm and -5 mm within the range, and rolling was performed.
  • the edge drop ratios of the stand ( second stand 32) and the next stand (third stand 3 3 ) are within an appropriate range, and Invention Examples 1 to 12 are included. There was no edge cracking for each of the twelve.
  • the rolling target material is an electromagnetic steel plate A
  • the rolling target material is an electromagnetic steel plate B
  • the rolling target material is an electromagnetic steel plate C
  • the taper work roll 4a1 is a second stand 3.
  • the linear load of the second stand 3 2 is 1.4 t / mm or more
  • the tapered rolled portion width WR ⁇ of the tapered work roll 4a1 of the second stand 3 2 is -60 mm outside the range in the negative direction.
  • the edges were raised at the stand ( second stand 32), and edge cracks were found in each of Comparative Example 1, Comparative Example 4, and Comparative Example 7. .
  • the rolling target material is an electromagnetic steel plate A
  • the rolling target material is an electromagnetic steel plate B
  • the rolling target material is an electromagnetic steel plate C
  • the taper work roll 4a1 is a second stand 3.
  • the linear load of the second stand 3 2 is 1.4 t / mm or more
  • the taper rolled portion width WR ⁇ of the tapered work roll 4a1 of the second stand 3 2 is rolled in the plus direction as +5 mm outside the range.
  • Comparative Example 2 Comparative Example 5, and Comparative Example 8 the edge is raised at the next stand (3rd stand 3 3 ) of the stand (2nd stand 3 2 ), and comparative example 2, comparative example 5, and comparative example are used. There was an edge crack for each of the eight.
  • the rolling target material is an electromagnetic steel plate A
  • the rolling target material is an electromagnetic steel plate B
  • the rolling target material is an electromagnetic steel plate C.
  • a flat work roll was applied on the 4 stands 34 and rolling was performed at a linear load of 1.4 t / mm or more on the 2nd stand 32.
  • the edge is raised at the next stand (3rd stand 3 3 ) of the stand (2nd stand 3 2 ) having a flat work roll, and comparative example 3 and comparison are made. There were edge cracks in each of Example 6 and Comparative Example 9.
  • the material to be rolled is the electromagnetic steel plate D
  • the taper work roll 4a1 is applied to the second stand 32
  • the linear load of the second stand 3 2 is 0.75 t / mm, which is out of the range
  • Rolling was performed with the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 32 2 being ⁇ 5 mm.
  • the material to be rolled is an electromagnetic steel plate D
  • the taper work roll 4a1 is applied to the second stand 32
  • the linear load of the second stand 3 2 is 0.75 t / mm, which is out of the range
  • Rolling was performed with the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 32 2 being 0 mm.
  • the material to be rolled is the electromagnetic steel plate D, the taper work roll 4a1 is applied to the second stand 32, and the linear load of the second stand 3 2 is 0.75 t / mm, which is out of the range, and Rolling was performed with the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 32 2 being +60 mm.
  • the material to be rolled is an electromagnetic steel sheet D, a flat work roll is applied to all the first stands 3 1 to the fourth stand 34, and the linear load of the second stand 32 is out of the range. Rolling was performed at 75 t / mm or more.
  • the rolling target material is an electromagnetic steel plate E
  • the rolling target material is an electromagnetic steel plate F
  • the rolling target material is an electromagnetic steel plate.
  • G be set, and the tapered work roll 4a1 is applied to the second stand 32, and the linear load of the second stand 3 2 is 0.8 t / mm or more and less than 1.4 t / mm within the range, and the second stand 3 2 is used. Rolling was performed with the tapered rolled portion width WR ⁇ of the tapered work roll 4a1 set to be between ⁇ 0 mm and +50 mm within the range.
  • the rolling target material is the electromagnetic steel plate E
  • the rolling target material is the electromagnetic steel plate F
  • the rolling target material is the electromagnetic steel plate G
  • the taper work roll 4a1 is the second stand 3.
  • the linear load of the second stand 3 2 is 0.8 t / mm or more and less than 1.4 t / mm
  • the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 3 2 is in the positive direction. Rolling was performed at + 60 mm outside the range.
  • Comparative Example 10 Comparative Example 13, and Comparative Example 16 the edges are raised at the next stand (third stand 3 3 ) of the stand (second stand 32), and comparative example 12, comparative example 15, and comparative example are used. There were edge cracks for each of the eighteen.
  • the rolling target material is the electromagnetic steel plate E
  • the rolling target material is the electromagnetic steel plate F
  • the rolling target material is the electromagnetic steel plate G
  • the taper work roll 4a1 is the second stand 3.
  • the linear load of the second stand 3 2 is 0.8 t / mm or more and less than 1.4 t / mm
  • the taper rolled portion width WR ⁇ of the taper work roll 4a1 of the second stand 3 2 is in the negative direction. Rolling was performed with a diameter of -5 mm outside the range.
  • the edges were raised at the stand ( second stand 32), and edge cracks were found in each of Comparative Example 11, Comparative Example 14, and Comparative Example 17. .
  • the material to be rolled is the electrical steel sheet E
  • the material to be rolled is the electrical steel sheet F
  • the material to be rolled is the electrical steel sheet G.
  • a flat work roll was applied on the 4 stands 34 and rolling was performed at a linear load of 0.8 t / mm or more and less than 1.4 t / mm on the second stand 32.
  • the edge is raised at the next stand (3rd stand 3 3 ) of the stand (2nd stand 3 2 ) having a flat work roll, and comparative example 12 and comparison are made. There were edge cracks in each of Example 15 and Comparative Example 18.
  • the rolling target material is the electromagnetic steel plate A
  • the taper work roll 4a1 is applied to the second stand 32
  • the linear load of the second stand 32 is 1.45 t / mm
  • the second stand Rolling was performed with the taper rolled portion width WR ⁇ of the tapered work roll 4a1 of 32 being set to ⁇ 30 mm within the range.
  • the inclination L / H of the taper 4ab of the taper work roll 4a1 was set to 1/400 within the suitable range.
  • the edge drop ratios of the stand ( second stand 32) and the next stand (third stand 3 3 ) were within an appropriate range, and there was no edge cracking.
  • the material to be rolled is an electromagnetic steel plate H
  • the taper work roll 4a1 is applied to the second stand 3 2 and the third stand 3 3
  • the second stand 3 2 and the third stand 3 3 wire load are applied.
  • Rolling was performed at 1.72 t / mm and the tapered rolled portion width WR ⁇ of each of the tapered work rolls 4a1 of the second stand 32 and the third stand 3 3 was set to ⁇ 30 mm within the range.
  • the edge drop ratios of the stand ( second stand 32) and the next stand (third stand 3 3 ) were within an appropriate range, and there was no edge cracking.
  • the rolling target material is a stainless steel plate
  • the rolling target material is a high carbon steel plate
  • the taper work roll 4a1 is applied to the second stand 32
  • the linear load of the second stand 32 is applied.
  • Rolling was performed at 1.4 t / mm or more, respectively, and the tapered rolled portion width WR ⁇ of the tapered work roll 4a1 of the second stand 32 was set to ⁇ 30 mm within the range.
  • the edge drop ratios of the stand ( second stand 32) and the next stand (third stand 3 3 ) are within an appropriate range, and the invention example 15 and the invention example There was no edge cracking for each of the 16.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)

Abstract

La présente invention concerne un procédé de laminage à froid, un équipement de laminage à froid et un procédé de fabrication de tôle d'acier laminée à froid, avec lesquels la fracturation de tôle peut être évitée en supprimant suffisamment l'apparition de fissuration de bord dans un matériau de laminage pendant le laminage à froid. Dans ce procédé de laminage à froid, un matériau de laminage (S) est laminé à froid au moyen d'un rouleau (2) qui comprend une pluralité de cages (31)-(34). Parmi la pluralité de cages (31)-(34), la Nième cage (3N), qui est positionnée à la Nième place (N étant un nombre entier supérieur ou égal à 2) depuis le côté amont dans la direction de transport du matériau de laminage (S), comporte un rouleau de travail conique (4a1) dans lequel un effilement (4ab) est formé au niveau d'une section d'extrémité (4ab) d'un rouleau (4aa) ayant un diamètre uniforme. Le Nième support (3N) lamine le matériau de laminage (S) à une charge linéaire supérieure ou égale à 0,8 t/mm.
PCT/JP2021/032889 2020-09-10 2021-09-07 Procédé de laminage à froid, équipement de laminage à froid et procédé de fabrication de tôle d'acier laminée à froid WO2022054806A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN202180051657.9A CN115968325A (zh) 2020-09-10 2021-09-07 冷轧方法、冷轧设备以及冷轧钢板的制造方法
KR1020237005232A KR20230039703A (ko) 2020-09-10 2021-09-07 냉간 압연 방법, 냉간 압연 설비, 및 냉연 강판의 제조 방법
MX2023002879A MX2023002879A (es) 2020-09-10 2021-09-07 Metodo de laminacion en frio, equipo de laminacion en frio, y metodo de fabricacion de lamina de acero laminada en frio.
JP2021565792A JP7156557B2 (ja) 2020-09-10 2021-09-07 冷間圧延方法、冷間圧延設備、及び冷延鋼板の製造方法
EP21866765.7A EP4212260A4 (fr) 2020-09-10 2021-09-07 Procédé de laminage à froid, équipement de laminage à froid et procédé de fabrication de tôle d'acier laminée à froid
US18/021,400 US20240033795A1 (en) 2020-09-10 2021-09-07 Cold rolling method, cold rolling equipment, and cold-rolled steel sheet manufacturing method

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JP2020-152348 2020-09-10
JP2020152348 2020-09-10

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US (1) US20240033795A1 (fr)
EP (1) EP4212260A4 (fr)
JP (1) JP7156557B2 (fr)
KR (1) KR20230039703A (fr)
CN (1) CN115968325A (fr)
MX (1) MX2023002879A (fr)
WO (1) WO2022054806A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05177213A (ja) * 1991-12-27 1993-07-20 Nkk Corp シャドウマスク用薄板の製造方法
JPH0691309A (ja) * 1992-09-11 1994-04-05 Nippon Steel Corp ワークロール及びこれを使用したタンデム冷間圧延機
JPH08252618A (ja) * 1995-03-16 1996-10-01 Kawasaki Steel Corp 冷間圧延におけるエッジドロップ・形状制御方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0788503A (ja) * 1993-09-24 1995-04-04 Nippon Steel Corp 軸方向ワークロールシフトを行なう金属の冷間圧延方法
JP2004058089A (ja) * 2002-07-29 2004-02-26 Hitachi Ltd 冷間鋼帯圧延設備及び圧延方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05177213A (ja) * 1991-12-27 1993-07-20 Nkk Corp シャドウマスク用薄板の製造方法
JPH0691309A (ja) * 1992-09-11 1994-04-05 Nippon Steel Corp ワークロール及びこれを使用したタンデム冷間圧延機
JPH08252618A (ja) * 1995-03-16 1996-10-01 Kawasaki Steel Corp 冷間圧延におけるエッジドロップ・形状制御方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4212260A4 *

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JPWO2022054806A1 (fr) 2022-03-17
EP4212260A1 (fr) 2023-07-19
EP4212260A4 (fr) 2024-01-24
JP7156557B2 (ja) 2022-10-19
KR20230039703A (ko) 2023-03-21
MX2023002879A (es) 2023-03-24
US20240033795A1 (en) 2024-02-01
CN115968325A (zh) 2023-04-14

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