WO2017141616A1 - 鋼帯のノッチング設備、鋼帯のノッチング方法、冷間圧延設備および冷間圧延方法 - Google Patents
鋼帯のノッチング設備、鋼帯のノッチング方法、冷間圧延設備および冷間圧延方法 Download PDFInfo
- Publication number
- WO2017141616A1 WO2017141616A1 PCT/JP2017/001844 JP2017001844W WO2017141616A1 WO 2017141616 A1 WO2017141616 A1 WO 2017141616A1 JP 2017001844 W JP2017001844 W JP 2017001844W WO 2017141616 A1 WO2017141616 A1 WO 2017141616A1
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- WIPO (PCT)
- Prior art keywords
- steel strip
- notching
- cold rolling
- grinding
- width direction
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0021—Cutting or shearing the product in the rolling direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0092—Welding in the rolling direction
Definitions
- the present invention relates to a notching facility for notching a joining portion of a steel strip, a notching method, a cold rolling facility, and a cold rolling method.
- notch notch
- the notch notch is not good at the end of the steel strip because of its poor butting accuracy, welding becomes insufficient, and the strength tends to be low. Therefore, the low-strength portion (generally about 30 mm at the width of the plate) is cut off. There is also an aim.
- Patent Document 2 discloses a method of notching in a substantially isosceles trapezoidal shape so that the maximum stress generation point is located other than the welded portion. Yes.
- the notching method as described above cannot exert a sufficient effect particularly in cold rolling of brittle materials and high alloy materials such as silicon steel plates and high-tensile steel plates having a high Si and Mn content.
- the present situation is that the joint fracture (welded fracture) in the hot rolling cannot be sufficiently prevented.
- An object of the present invention is to provide a steel strip notching facility, a steel strip notching method, a cold rolling facility, and a cold rolling method that enable cold rolling without causing fracture.
- the present inventors have described later in detail, but when notching the welded part by shearing as in the prior art, the end part in the plate width direction of the welded part thereby. Has been found to be work-hardened, which causes the weld to break. And in order to prevent such a welded part fracture
- the present invention has been made based on the above idea and has the following features.
- Steel strip notching equipment characterized by that.
- Notching equipment for forming notches at both edges in the steel strip width direction of the joint between the rear end of the preceding steel strip and the tip of the subsequent steel strip, including both the steel strip width direction including the joint
- a steel strip notching facility comprising grinding means for forming a notch by grinding an end face of an edge.
- a notching method in which notches are formed at both edges in the steel strip width direction of the joint where the rear end of the preceding steel strip and the tip of the subsequent steel strip are joined, and the width of the steel strip including the joint is included.
- the first step notch is formed by shearing both edges in the direction, and then the second step notch is formed by grinding the end faces of both edges in the steel strip width direction of the joint.
- a notching method in which notches are formed at both edges in the steel strip width direction of the joint where the rear end of the preceding steel strip and the tip of the subsequent steel strip are joined, and the width of the steel strip including the joint is included.
- a cold rolling method characterized by forming a notch using the notching method according to [3] or [4] and performing cold rolling.
- the present inventors conducted a laboratory-scale rolling experiment described below in order to investigate the cause of the tendency to break at the weld.
- the rear end of the preceding steel strip 1 and the front end of the subsequent steel strip 2 are Prepare a material joined using a laser welding machine, shear a rectangular specimen (rolling evaluation specimen) 4 having a long side in a direction perpendicular to the welding direction so as to include a part of the weld 3. It was cut out and collected by processing.
- the sample material 4 produced in this way was cold-rolled with a total rolling reduction of 90% in 3 passes using a rolling mill with a work roll diameter of 500 mm without applying tension.
- FIG. 2 shows a photograph of the appearance of the obtained steel sheet after cold rolling. Even when no tension is applied, it can be seen that edge cracks occur in the welded portion (welded metal portion) 3. In tandem rolling in which tension is applied and rolled as in actual production, it is estimated that this edge crack is the starting point of the weld fracture.
- FIG. 3A shows the structure of the edge cross section
- FIG. 3B shows the hardness distribution of the edge cross section.
- the present inventors have intensively studied a notching method for forming a notch having almost no work-hardened portion at the end portion in the plate width direction of the welded portion, and tried to process the welded portion by grinding.
- FIG. 4 shows the appearance of the obtained steel sheet after cold rolling (corresponding to FIG. 2 above), and FIG. 5 shows the results of the structure observation of the edge cross section and the hardness test (corresponding to FIG. 3 above).
- (B) grinding is performed with a # 36 grindstone it is observed that edge cracking slightly occurs and that the edge portion is work-hardened.
- the edge cracking and work hardening amount are significantly smaller than in the case of the shearing process shown in FIGS. 2 and 3.
- edge cracks in the welded part are greatly affected by work hardening of the welded part by shearing, and edge cracking can be prevented by removing the work hardened part by grinding.
- work hardening refers to a state in which the Vickers hardness at the end of the plate width is 50 HV or higher compared to the Vickers hardness of the base material portion (portion inside 2 mm or more from the end of the plate width). .
- FIG. 6 is a diagram showing Embodiment 1 of the present invention.
- a shearing means shearing machine or the like
- a grinding means disc grinder or the like
- first notch formation of the first notch
- second notching formation of the second notch
- the notch 13 which hardly has the work hardening part can be formed in the board width direction edge part of the welding part 3, and the silicon steel plate and high-tensile steel plate with much content of Si and Mn Even in the case of a brittle material or a high alloy material such as the above, it is possible to perform cold rolling without causing a weld fracture.
- FIG. 7 is a diagram showing Embodiment 2 of the present invention.
- notching equipment provided with grinding means (disk grinder or the like) for grinding the end faces of both edges of the steel strip width direction is installed.
- An arc-shaped notch 15 is formed by grinding 14 with respect to a predetermined range including the end in the plate width direction of the welded portion 3 of the row steel strip 2. That is, in the second embodiment, the entire notch 15 is formed by grinding 14.
- the notch 15 which has almost no work-hardened part can be formed in the edge part of the board width direction of the welding part 3, and the silicon steel plate and high-tensile steel plate with much Si and Mn content Even in the case of a brittle material or a high alloy material such as the above, it is possible to perform cold rolling without causing a weld fracture.
- Embodiments 1 and 2 described above in order to grind without hardening the edge portion, it is preferable to use a # 80 or higher grindstone, although it depends on the type of abrasive grains and the pressing pressure.
- a disk grinder may be installed in a robot such as MOTOMAN-MH50II (MOTOMAN is a registered trademark) manufactured by Yaskawa Electric to grind the welded portion.
- first embodiment and the second embodiment may be appropriately selected from the viewpoint of the time allowed for forming the notch, the facility space, the facility cost, and the like.
- the present invention may be notched in a semicircular shape as described in Patent Document 1, or may be notched in a substantially isosceles trapezoidal shape as described in Patent Document 2. Further, there is no problem with shapes other than those described above, and the notching shape is not particularly defined in the present invention.
- edge cracking does not occur even in the case of shearing with ordinary low-carbon steel, but in brittle materials and high-alloy materials such as silicon steel sheets and high-tensile steel sheets with high Si and Mn contents, Therefore, edge cracking is likely to occur when work hardening is performed by shearing.
- a cold tandem rolling mill it may be a dedicated mill for silicon steel plates or high-tensile steel plates, but it may also be a dual-purpose mill for rolling together with low carbon steel. In that case, there is no problem in applying the present invention to low carbon steel.
- a silicon steel plate having a large content of Si or Mn is, for example, a steel plate containing Si: 1.0 to 6.5% by mass and Mn: 0.2 to 1.0% by mass.
- the high-strength steel sheet having a large content of is, for example, a steel sheet containing Si: 1.0 to 2.0 mass%, Mn: 1.5 to 20.0 mass%, and having a tensile strength of 590 to 1470 MPa. .
- a silicon steel sheet was manufactured and evaluated by a cold rolling facility equipped with a 5-stand cold tandem rolling mill.
- a predetermined range including a welded portion was notched in a semicircular shape by shearing.
- Example 1 of the present invention notching was performed based on Embodiment 1 of the present invention described above. That is, after notching the first step in a semicircular shape by a shearing process to a predetermined range including the welded portion, the second step using a # 80 grindstone is applied to the welded portion and the vicinity thereof. As a notching, 2 mm was removed by grinding.
- Example 2 of the present invention notching was performed based on the above-described Embodiment 2 of the present invention. That is, a predetermined range including the welded portion was notched in a semicircular shape by grinding with a # 36 grindstone.
- 100 coils of a steel strip having a Si content of 3.1% by mass to less than 3.5% by mass and a plate thickness of 1.8 mm or more and 2.4 mm or less are prepared. It cold-rolled with the rolling mill and finished to plate thickness 0.3mm or more and 0.5mm or less. At this time, the fracture occurrence rates at the welds were compared. The result is shown in FIG.
- the rate of occurrence of weld fracture is 7%, whereas in the present invention example 1, the weld fracture can be reduced to 1%.
- the weld fracture was reduced to 3%.
Abstract
Description
図6は、本発明の実施形態1を示す図である。この実施形態1においては、鋼帯幅方向両縁部をせん断加工するせん断加工手段(せん断加工機等)と、鋼帯幅方向両縁部の端面を研削する研削手段(ディスクグラインダー等)とを備えたノッチング設備が設置されている。そして、図6に示すように、先行鋼帯1と後行鋼帯2の溶接部3の板幅方向端部を含めた所定範囲に対して、せん断加工11による1段目のノッチングを施して円弧状のノッチを形成した後、溶接部3を含めて溶接部3近傍のみ、加工硬化した部分を研削12による2段目のノッチングで除去することで、最終的にノッチ13を形成するようにしている。すなわち、先行鋼帯1と後行鋼帯2の板幅差や鋼帯接合時の幅ずれの影響をなくすための大きなノッチング(1段目のノッチング:1段目のノッチの形成)はせん断加工11により行い、溶接部の加工硬化部のみを除去する小さなノッチング(2段目のノッチング:2段目のノッチの形成)は研削12で行っている。
図7は、本発明の実施形態2を示す図である。この実施形態2においては、鋼帯幅方向両縁部の端面を研削する研削手段(ディスクグラインダー等)を備えたノッチング設備が設置されており、図7に示すように、先行鋼帯1と後行鋼帯2の溶接部3の板幅方向端部を含めた所定範囲に対して、研削14によって円弧状のノッチ15を形成している。すなわち、この実施形態2では、ノッチ15全体を研削14で形成している。
2 後行鋼帯
3 溶接部
4 圧延評価用供試材
11 せん断加工
12 研削
13 ノッチ
14 研削
15 ノッチ
Claims (6)
- 先行鋼帯の後端と後行鋼帯の先端との接合部の鋼帯幅方向両縁部にノッチを形成するノッチング設備であって、当該接合部を含めて鋼帯幅方向両縁部をせん断加工により1段目のノッチを形成するせん断加工手段と、当該接合部の鋼帯幅方向両縁部の端面を研削により2段目のノッチを形成する研削手段とを備えていることを特徴とする鋼帯のノッチング設備。
- 先行鋼帯の後端と後行鋼帯の先端との接合部の鋼帯幅方向両縁部にノッチを形成するノッチング設備であって、当該接合部を含めて鋼帯幅方向両縁部の端面を研削によりノッチを形成する研削手段を備えていることを特徴とする鋼帯のノッチング設備。
- 先行鋼帯の後端と後行鋼帯の先端とを接合した接合部の鋼帯幅方向両縁部にノッチを形成するノッチング方法であって、当該接合部を含めて鋼帯幅方向両縁部をせん断加工することによって1段目のノッチを形成した後、当該接合部の鋼帯幅方向両縁部の端面を研削することによって2段目のノッチを形成することを特徴とする鋼帯のノッチング方法。
- 先行鋼帯の後端と後行鋼帯の先端とを接合した接合部の鋼帯幅方向両縁部にノッチを形成するノッチング方法であって、当該接合部を含めて鋼帯幅方向両縁部の端面を研削することによってノッチを形成することを特徴とする鋼帯のノッチング方法。
- 請求項1または2に記載のノッチング設備が設置されていることを特徴とする冷間圧延設備。
- 請求項3または4に記載のノッチング方法を用いてノッチを形成して冷間圧延を行うことを特徴とする冷間圧延方法。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US16/077,784 US11065658B2 (en) | 2016-02-17 | 2017-01-20 | Notching equipment for steel strip, method of notching steel strip, cold rolling facility, and method of cold rolling |
CN201780011845.2A CN108698096B (zh) | 2016-02-17 | 2017-01-20 | 钢带的冲口设备、钢带的冲口方法、冷轧设备及冷轧方法 |
EP17752880.9A EP3395459B1 (en) | 2016-02-17 | 2017-01-20 | Equipment for notching steel strip, method for notching steel strip, cold rolling equipment, and cold rolling method |
RU2018129926A RU2701799C1 (ru) | 2016-02-17 | 2017-01-20 | Оборудование для изготовления вырезов в стальной полосе, способ получения вырезов в стальной полосе, техническое средство для холодной прокатки и способ выполнения холодной прокатки |
KR1020187023176A KR102288554B1 (ko) | 2016-02-17 | 2017-01-20 | 강대의 노칭 설비, 강대의 노칭 방법, 냉간 압연 설비 및 냉간 압연 방법 |
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JP2016-027855 | 2016-02-17 | ||
JP2016027855A JP6164315B1 (ja) | 2016-02-17 | 2016-02-17 | 鋼帯のノッチング設備、鋼帯のノッチング方法、冷間圧延設備および冷間圧延方法 |
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US (1) | US11065658B2 (ja) |
EP (1) | EP3395459B1 (ja) |
JP (1) | JP6164315B1 (ja) |
KR (1) | KR102288554B1 (ja) |
CN (1) | CN108698096B (ja) |
RU (1) | RU2701799C1 (ja) |
TW (1) | TWI634957B (ja) |
WO (1) | WO2017141616A1 (ja) |
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WO2021106543A1 (ja) * | 2019-11-25 | 2021-06-03 | Jfeスチール株式会社 | 鋼帯のノッチング方法、冷間圧延方法および冷延鋼帯の製造方法 |
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CN108188176B (zh) * | 2017-12-28 | 2019-04-23 | 武汉钢铁有限公司 | 一种热轧硅钢带生产方法 |
CN109048374B (zh) * | 2018-09-27 | 2020-11-03 | 浙江华赢特钢科技有限公司 | 一种硅钢片一体成型设备及工艺流程 |
KR102218418B1 (ko) * | 2019-12-02 | 2021-02-19 | 주식회사 포스코 | 스트립 처리 장치 |
CN113996664B (zh) * | 2021-11-19 | 2024-04-12 | 承德建龙特殊钢有限公司 | 一种飞剪后的碎断辊道装置及其用途 |
CN115069732B (zh) * | 2022-05-30 | 2023-06-16 | 浙江谋皮环保科技有限公司 | 一种刷条分离回收方法 |
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- 2017-01-20 CN CN201780011845.2A patent/CN108698096B/zh active Active
- 2017-01-20 RU RU2018129926A patent/RU2701799C1/ru active
- 2017-01-20 EP EP17752880.9A patent/EP3395459B1/en active Active
- 2017-01-20 KR KR1020187023176A patent/KR102288554B1/ko active IP Right Grant
- 2017-01-20 US US16/077,784 patent/US11065658B2/en active Active
- 2017-01-20 WO PCT/JP2017/001844 patent/WO2017141616A1/ja active Application Filing
- 2017-02-14 TW TW106104673A patent/TWI634957B/zh active
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JP2000280093A (ja) * | 1999-03-30 | 2000-10-10 | Kawasaki Steel Corp | 鋼帯溶接部の研削方法および装置 |
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Cited By (3)
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WO2021106543A1 (ja) * | 2019-11-25 | 2021-06-03 | Jfeスチール株式会社 | 鋼帯のノッチング方法、冷間圧延方法および冷延鋼帯の製造方法 |
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Publication number | Publication date |
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EP3395459B1 (en) | 2020-11-18 |
TWI634957B (zh) | 2018-09-11 |
JP2017144467A (ja) | 2017-08-24 |
KR102288554B1 (ko) | 2021-08-10 |
RU2701799C1 (ru) | 2019-10-01 |
US20200030862A1 (en) | 2020-01-30 |
JP6164315B1 (ja) | 2017-07-19 |
CN108698096B (zh) | 2020-06-09 |
TW201736015A (zh) | 2017-10-16 |
EP3395459A1 (en) | 2018-10-31 |
KR20180102143A (ko) | 2018-09-14 |
US11065658B2 (en) | 2021-07-20 |
CN108698096A (zh) | 2018-10-23 |
EP3395459A4 (en) | 2019-02-13 |
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