US20140090436A1 - Tension leveler - Google Patents

Tension leveler Download PDF

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Publication number
US20140090436A1
US20140090436A1 US14/039,844 US201314039844A US2014090436A1 US 20140090436 A1 US20140090436 A1 US 20140090436A1 US 201314039844 A US201314039844 A US 201314039844A US 2014090436 A1 US2014090436 A1 US 2014090436A1
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US
United States
Prior art keywords
rolls
work roll
backup
roll
work
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US14/039,844
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English (en)
Inventor
Kouki Yamaguchi
Yuuya Ono
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Heavy Industries Himatex Co Ltd
Original Assignee
Sumitomo Heavy Industries Himatex Co Ltd
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 Sumitomo Heavy Industries Himatex Co Ltd filed Critical Sumitomo Heavy Industries Himatex Co Ltd
Assigned to SUMITOMO HEAVY INDUSTRIES HIMATEX CO., LTD. reassignment SUMITOMO HEAVY INDUSTRIES HIMATEX CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ONO, YUUYA, YAMAGUCHI, KOUKI
Publication of US20140090436A1 publication Critical patent/US20140090436A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/05—Stretching combined with rolling

Definitions

  • the present invention relates to a tension leveler, and particularly, to a tension leveler having a function of crushing scales adhering to the surface of a metal sheet, which is being passed, while correcting the shape of the metal sheet.
  • a tension leveler including a plurality of work rolls that are alternately arranged with respect to a sheet passing line and come into contact with a metal sheet, and a backup roll that is arranged opposite to the sheet passing line with respect the work rolls and comes into contact with the work rolls, are disclosed in the related art.
  • a tension leveler including a work roll coming into contact with a metal sheet; and a backup roll coming into contact with the work roll.
  • a hardening layer harder than the inside of the backup roll is formed on the surface of the backup roll.
  • the Shore hardness inside the backup roll is lower than the Shore hardness in the surface of the backup roll by HS23 to HS36.
  • FIG. 1 is a side view showing the outline of a tension leveler.
  • FIG. 2 is a side view showing mainly work rolls and backup rolls in FIG. 1 .
  • FIG. 3 is a view showing the comparison between a work roll in the related art and a work roll using an embodiment of the invention.
  • FIG. 4 is a view showing the comparison between a work roll in the related art and a work roll using the embodiment of the invention.
  • the work roll is usually replaced in a short period of time (for example, from one week to one month).
  • the replacement frequency of the work roll has a great influence on the manufacturing cost of the metal sheet.
  • the Shore hardness inside the backup roll is lower than the Shore hardness in the surface of the backup roll by HS23 to HS36. Therefore, even when powdered scales or foreign matter is caught between the work roll and the backup roll, the impact is absorbed by the backup roll. Accordingly, since the influence that the powdered scales or foreign matter has on the work roll becomes very small, long lifespan of the work roll may be achieved.
  • the deformation of the backup roll becomes excessive, and there is a tendency that it is difficult to hold down the work roll with the backup roll.
  • the Shore hardness in the surface of the backup roll may be HS70 to HS75, and the Shore hardness inside the backup roll may be HS39 to HS47. If the Shore hardness in the surface of the backup roll is lower than HS70 or the Shore hardness inside the backup roll is lower than HS39, the surface of the backup roll is soft and easily deformed. Therefore, the backup roll tends to wear partially. Therefore, an impact-absorbing effect in the backup roll is not sufficiently exhibited, and the work roll also tends to wear. If the Shore hardness in the surface of the backup roll is higher than HS75, the hardness of the surface of the backup roll is close to the hardness of the surface of the work roll.
  • the backup roll may be made of hypoeutectoid steel whose carbon content is equal to or lower than 0.8%.
  • the Shore hardness in the surface of the backup roll may be lower than the Shore hardness in the surface of the work roll by HS8 to HS22.
  • the hardnesses of the surfaces of both the rolls are nearly equal to each other. Therefore, when powdered scales or foreign matter is caught between the work roll and the backup roll, the impact cannot be absorbed by the backup roll, and the work roll and the backup roll tend to wear therebetween.
  • the deformation of the backup roll becomes excessive, and there is a tendency that it is difficult to hold down the work roll with the backup roll.
  • the Shore hardness in the surface of the work roll may be HS83 to HS92. If the Shore hardness in the surface of the work roll is lower than H83, the surface of the work roll tends to wear greatly due to scales or foreign matter or the impact-resistant load of the work roll against scales or foreign matter tend to become low. If the Shore hardness in the surface of the work roll is higher than HS92, the toughness of the surface of the work roll becomes insufficient and the surface of the work roll become weak due to the impact received from scales or foreign matter. Thus, a phenomenon in which a portion of the surface of the work roll is missing and drops out tends to increase.
  • the Shore hardness in this specification is a value measured according to JIS Z 2246 “Shore Hardness Test Method”.
  • a tension leveler 10 as shown in FIG. 1 , includes a main body 12 and roller units 14 A to 14 F.
  • the main body 12 has a passage 16 that extends in a horizontal direction from one side surface 12 a toward the other side surface 12 b, and a water-cooling mechanism (not shown) for cooling the roller units 14 A to 14 F.
  • a metal sheet M is passed through the passage 16 along a sheet passing line L.
  • An opening 16 a of the passage 16 on a side surface 12 a side functions as an inlet when the metal sheet M is carried into the main body 12 (passage 16 ).
  • a pair of guide rolls 18 for guiding the metal sheet M is arranged on the upstream side of the opening 16 a.
  • An opening 16 b of the passage 16 on a side surface 12 b side functions as an outlet when the metal sheet (for example, steel sheet) M is carried out of the main body 12 (passage 16 ).
  • a pair of guide rolls 20 for guiding the metal sheet M is arranged on the downstream side of the opening 16 b.
  • the roller units 14 A to 14 F are arranged within the passage 16 .
  • the roller unit 14 A is located on the most upstream side within the passage 16 , and is attached to a ceiling side of the passage 16 .
  • the roller unit 14 A has a roller supporting portion 22 A, a work roll 24 A, and a pair of backup rolls 26 A.
  • the roller supporting portion 22 A rotatably supports the work roll 24 A and the pair of backup rolls 26 A.
  • the work roll 24 A is located below the pair of backup rolls 26 A between the pair of backup rolls 26 A.
  • the work roll 24 A comes into contact with the metal sheet M on a lower end side thereof.
  • the pair of backup rolls 26 A comes into contact with the work roll 24 A on lower sides thereof and supports the work roll 24 A.
  • the roller unit 14 B is located on the downstream side of the roller unit 14 A within the passage 16 , and is attached to a floor side of the passage 16 .
  • the roller unit 14 B has a roller supporting portion 22 B, a work roll 24 B, and a pair of backup rolls 26 B.
  • the roller supporting portion 22 B rotatably supports the work roll 24 B and the pair of backup rolls 26 B.
  • the work roll 24 B is located above the pair of backup rolls 26 B between the pair of backup rolls 26 B.
  • the work roll 24 B comes into contact with the metal sheet M on an upper end side thereof.
  • the pair of backup rolls 26 B comes into contact with a lower side of the work roll 24 B on upper sides thereof and supports the work roll 24 B.
  • the work roll 24 B is located slightly further toward the downstream side than the work roll 24 A.
  • An upper end of the work roll 24 B is located slightly above a lower end of the work roll 24 A. Therefore, the metal sheet M passed between the work roll 24 A and the work roll 24 B is deformed in a wavelike fashion by the work rolls 24 A and 24 B. Due to this deformation, the shape of the metal sheet M is corrected and scales adhering to the surface of the metal sheet M are crushed.
  • the roller unit 14 C is located on the downstream side of the roller unit 14 B within the passage 16 , and is attached to the ceiling side of the passage 16 .
  • the roller unit 14 C has a roller supporting portion 22 C, a work roll 24 C, and a pair of backup rolls 26 C.
  • the roller supporting portion 22 C rotatably supports the work roll 24 C and the pair of backup rolls 26 C.
  • the work roll 24 C is located below the pair of backup rolls 26 C between the pair of backup rolls 26 C.
  • the work roll 24 C comes into contact with the metal sheet M on a lower end side thereof.
  • the pair of backup rolls 26 C comes into contact with an upper side of the work roll 24 C on lower sides thereof, and supports the work roll 24 C.
  • the roller unit 14 D is located on the downstream side of the roller unit 14 C within the passage 16 , and is attached to the floor side of the passage 16 .
  • the roller unit 14 D has a roller supporting portion 22 D, a work roll 24 D, and a pair of backup rolls 26 D.
  • the roller supporting portion 22 D rotatably supports the work roll 24 D and the pair of backup rolls 26 D.
  • the work roll 24 D is located above the pair of backup rolls 26 D between the pair of backup rolls 26 D.
  • the work roll 24 D comes into contact with the metal sheet M on an upper end side thereof.
  • the pair of backup rolls 26 D comes into contact with a lower side of the work roll 24 D on upper sides thereof and supports the work roll 24 D.
  • the positional relationship between the work roll 24 C and the work roll 24 D is the same as the positional relationship between the work roll 24 A and the work roll 24 B that are shown in FIG. 2 . That is, the work roll 24 D is located slightly further toward the downstream side than the work roll 24 C. An upper end of the work roll 24 D is located slightly above a lower end of the work roll 24 C. Therefore, the metal sheet M passed between the work roll 24 C and the work roll 24 D is deformed in a wavelike fashion by the work rolls 24 C and 24 D. Due to this deformation, the shape of the metal sheet M is further corrected and scales adhering to the surface of the metal sheet M are further crushed.
  • the roller unit 14 E is located on the downstream side of the roller unit 14 D within the passage 16 , and is attached to the ceiling side of the passage 16 .
  • the roller unit 14 E has a roller supporting portion 22 E, a work roll 24 E, and a pair of backup rolls 26 E.
  • the roller supporting portion 22 E rotatably supports the work roll 24 E and the pair of backup rolls 26 E.
  • the work roll 24 E is located below the pair of backup rolls 26 E between the pair of backup rolls 26 E.
  • the work roll 24 E comes into contact with the metal sheet M on a lower end side thereof.
  • the pair of backup rolls 26 E comes into contact with an upper side of the work roll 24 E on lower sides thereof, and supports the work roll 24 E.
  • the roller unit 14 F is attached to the floor side of the passage 16 so as to face the roller unit 14 E within the passage 16 .
  • the roller unit 14 F has a roller supporting portion 22 F and a pair of work rolls 24 F.
  • the roller supporting portion 22 F rotatably supports the pair of work rolls 24 F.
  • the pair of work rolls 24 F comes into contact with the metal sheet M on upper end sides thereof.
  • the pair of work rolls is located so as to face the pair of backup rolls 26 E of the roller unit 14 E.
  • the work roll 24 E of the roller unit 14 E is located between the pair of work rolls 24 F. Therefore, the metal sheet M passed between the work roll 24 E and the pair of work rolls 24 F comes into contact with the rolls 24 E and 24 F in order of the upper end side of the work roll 24 F on the upstream side, the lower end side of the work roll 24 E, and the upper end side of the work roll 24 F on the downstream side.
  • the diameter of the work rolls 24 A to 24 D may be set to, for example, about 80 mm.
  • the diameter of the work rolls 24 E and 24 F may be set to, for example, about 120 mm.
  • the diameter of the backup rolls 26 A to 26 E may be set to, for example, 120 mm.
  • a hardening layer with a thickness of, for example, about 5 mm to 7 mm is formed on the surfaces of the work rolls 24 A to 24 F and the backup rolls 26 A to 26 E by, for example, high-frequency hardening. The hardness in the surfaces of the work rolls 24 A to 24 F and the backup rolls 26 A to 26 E is secured by this hardening layer.
  • the Shore hardness in the surfaces of the work rolls 24 A to 24 F may be set to, for example, about HS83 to HS92. If the Shore hardness in the surfaces of the work rolls 24 A to 24 F is lower than HS83, the surfaces of the work rolls 24 A to 24 F tend to wear greatly due to scales or foreign matter or the impact-resistant load of the work rolls 24 A to 24 F against scales or foreign matter tend to become low. If the Shore hardness in the surfaces of the work rolls 24 A to 24 F is higher than HS92, the toughness of the surfaces of the work rolls 24 A to 24 F becomes insufficient and the surface of the work rolls becomes weak due to the impact received from scales or foreign matter. Thus, a phenomenon in which portions of surfaces of the work rolls 24 A to 24 F are missing and drop out tends to increase.
  • the Shore hardness inside the work rolls 24 A to 24 F may be set to about HS36 to HS40.
  • the Shore hardness in the surfaces of the backup rolls 26 A to 26 E is preferably lower than the Shore hardness in the surfaces of the work rolls 24 A to 24 F by about HS8 to HS22, and may be set to, for example, about HS70 to HS75. If the difference between the Shore hardness in the surfaces of the work rolls 24 A to 24 F and the Shore hardness in the surfaces of the backup rolls 26 A to 26 E is lower than the above range, the hardnesses of both the surfaces become nearly equal to each other. Therefore when powdered scales or foreign matter is caught between the work rolls 24 A to 24 F and the backup rolls 26 A to 26 E, the impact cannot be absorbed by the backup rolls 26 A to 26 E, and the work rolls and the backup rolls tend to wear therebetween.
  • the difference between the Shore hardness in the surfaces of the work rolls 24 A to 24 F and the Shore hardness in the surfaces of the backup rolls 26 A to 26 E is higher than the above range, the deformation of the backup rolls 26 A to 26 E becomes excessive, and there is a tendency that it is difficult to hold down the work rolls 24 A to 24 F with the backup rolls 26 A to 26 E.
  • the Shore hardness in the surfaces of the backup rolls 26 A to 26 E is lower than HS70, the surfaces of the backup rolls 26 A to 26 E are soft and easily deformed. Therefore, the backup rolls 26 A to 26 E tend to wear partially. Therefore, an impact-absorbing effect in the backup rolls 26 A to 26 E is not sufficiently exhibited, and the work rolls 24 A to 24 F also tend to wear.
  • the Shore hardness in the surfaces of the backup rolls 26 A to 26 E is higher than HS75, the hardness of the surfaces of the backup rolls 26 A to 26 E is close to the hardness of the surfaces of the work rolls 24 A to 24 F. Therefore, when powdered scales or foreign matter is caught between the work rolls 24 A to 24 F and the backup rolls 26 A to 26 E, the impact cannot be absorbed by the backup rolls 26 A to 26 E, and the work rolls and the backup rolls tend to wear therebetween.
  • the Shore hardness inside the backup rolls 26 A to 26 E is lower than the Shore hardness in the surfaces of the backup rolls 26 A to 26 E by about HS23 to HS36, and may be set to, for example, about HS39 to HS47. If the difference between the Shore hardness in the surfaces of the backup rolls 26 A to 26 E and the Shore hardness inside the backup rolls 26 A to 26 E is lower than the above range, there is a tendency that it is difficult to obtain the effect of impact absorption by the backup rolls 26 A to 26 E.
  • the difference between the Shore hardness in the surfaces of the backup rolls 26 A to 26 E and the Shore hardness inside the backup rolls 26 A to 26 E is higher than the above range, the deformation of the backup rolls 26 A to 26 E becomes excessive, and there is a tendency that it is difficult to hold down the work rolls 24 A to 24 E with the backup rolls 26 A to 26 E.
  • the Shore hardness inside the backup rolls 26 A to 26 E is lower than HS39, the surfaces of the backup rolls 26 A to 26 E are soft and easily deformed. Therefore, the backup rolls 26 A to 26 E tend to wear partially. Therefore, an impact-absorbing effect in the backup rolls 26 A to 26 E is not sufficiently exhibited, and the work rolls 24 A to 24 E also tend to wear.
  • the Shore hardness inside the backup rolls 26 A to 26 E is higher than HS47, the cushioning property inside the backup rolls 26 A to 26 E degrades, and consequently, the surfaces of the backup rolls 26 A to 26 E tend to wear.
  • the work rolls 24 A to 24 F may be made of, for example, powdered high-speed steel.
  • the backup rolls 26 A to 26 E may be made of, for example, hypoeutectoid steel (for example, chromium molybdenum steel (SCN440)) whose carbon content is equal to or lower than 0.8%.
  • SCN440 chromium molybdenum steel
  • the Shore hardness of chromium molybdenum steel (SCN440) before hardening is about HS39.
  • the Shore hardness inside the backup rolls 26 A to 26 E is lower than the Shore hardness in the surfaces of the backup rolls 26 A to 26 E by HS23 to HS36. Therefore, even when powdered scales or foreign matter is caught between the work rolls 24 A to 24 E and the backup rolls 26 A to 26 E, the impact is absorbed by the backup rolls 26 A to 26 E. Accordingly, since the influence that the powdered scales or foreign matter has on the work rolls 24 A to 24 E becomes very small, long lifespan of the work rolls 24 A to 24 E may be achieved. As a result, it is possible to significantly reduce the manufacturing cost of the metal sheet M. In addition, as for the lifespan of the work rolls 24 A to 24 E, the surface state of the metal sheet M to be processed by the tension leveler 10 is observed, and it is determined whether or not there is damage or the like.
  • FIG. 3 The result of comparison between a work roll in the related art and a work roll using the embodiment of the invention is shown in FIG. 3 .
  • a work roll on an upper side in FIG. 3 is the work roll in the related art.
  • a work roll on a lower side in FIG. 3 is the work roll using the embodiment of the invention.
  • the respective work rolls are rolls after 20 days have passed from the beginning of use.
  • damage of a striped pattern referred to as chatter marks is caused.
  • the damage as being caused on the surface of the work roll in the related art is not seen on the surface of the work roll using the embodiment of the invention.
  • FIG. 4 The result of comparison between a work roll in the related art and a work roll using the embodiment of the invention is also shown in FIG. 4 .
  • a work roll on an upper side in FIG. 4 is the work roll in the related art.
  • a work roll on a lower side in FIG. 4 is the work roll using the embodiment of the invention.
  • the work roll in the related art is a roll after 20 days have passed from the beginning of use.
  • the work roll using the embodiment of the invention is one after 3 months have passed from the beginning of use. Spots whose surfaces are shaved off and discolored are present in the work roll in the related art. In contrast, the shaving or discoloring as being caused on the surface of the work roll in the related art is not seen on the surface of the work roll using the embodiment of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
US14/039,844 2012-10-01 2013-09-27 Tension leveler Abandoned US20140090436A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-219541 2012-10-01
JP2012219541A JP5996357B2 (ja) 2012-10-01 2012-10-01 テンションレベラー

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US (1) US20140090436A1 (ru)
JP (1) JP5996357B2 (ru)
CN (1) CN103722049A (ru)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104368633B (zh) * 2014-10-17 2016-05-11 无锡市新加源冶金机械制造有限公司 带钢平整机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894325A (en) * 1973-05-11 1975-07-15 Hitachi Metals Ltd Large-sized and thick compound sleeves of high hardness

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0755330B2 (ja) * 1987-08-03 1995-06-14 第一高周波工業株式会社 スケールブレーカー用ワークロール
JPH01178319A (ja) * 1988-01-07 1989-07-14 Fuji Photo Film Co Ltd ローラレベラ
JP3246171B2 (ja) * 1994-03-18 2002-01-15 住友金属工業株式会社 熱間圧延方法
JP2001252719A (ja) * 2000-03-09 2001-09-18 Sumitomo Heavy Ind Ltd テンションレベラー
KR100360371B1 (ko) * 2000-08-25 2002-11-13 재단법인 포항산업과학연구원 스트립의 반곡을 교정하는 텐션레벨러
JP2004082171A (ja) * 2002-08-27 2004-03-18 Nsk Ltd レベラーバックアップロール用密封装置
CN101332469B (zh) * 2007-06-28 2010-07-21 上海宝信软件股份有限公司 拉矫机控制方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894325A (en) * 1973-05-11 1975-07-15 Hitachi Metals Ltd Large-sized and thick compound sleeves of high hardness

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JP5996357B2 (ja) 2016-09-21
JP2014069229A (ja) 2014-04-21

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Owner name: SUMITOMO HEAVY INDUSTRIES HIMATEX CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAMAGUCHI, KOUKI;ONO, YUUYA;SIGNING DATES FROM 20131025 TO 20131028;REEL/FRAME:031536/0895

STCB Information on status: application discontinuation

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