EP0508475B1 - Tension roller leveler - Google Patents
Tension roller leveler Download PDFInfo
- Publication number
- EP0508475B1 EP0508475B1 EP19920106289 EP92106289A EP0508475B1 EP 0508475 B1 EP0508475 B1 EP 0508475B1 EP 19920106289 EP19920106289 EP 19920106289 EP 92106289 A EP92106289 A EP 92106289A EP 0508475 B1 EP0508475 B1 EP 0508475B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolls
- work rolls
- backup
- work
- tension
- 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.)
- Revoked
Links
Images
Classifications
-
- 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
Description
- The present invention relates to a tension roller leveler, and more particularly to a tension roller leveler capable of high-speed treatment.
- As an apparatus for reforming strip plates or sheets, there has been conventionally known, by way of example, a tension leveler in combination of
extension rolls 20 and succeedinganti-cambering rolls 21 as shown in Fig. 4, or an apparatus including aroller leveler 22 which is located down-stream of such a tension leveler and comprises a number of work rolls 1', 2' respectively arranged on the upper and lower sides of a strip plate S. - In the former tension leveler, however, sensitivity is so high that a curl (longitudinal curvature), particularly, is changed to a large extent upon a small amount of penetration, as shown in Fig. 6. This results in the necessity of delicate control and hence difficulties in achieving a stable levelling effect.
- In the latter apparatus, sensitivity is not so sharp as the former tension leveler, as shown in Fig. 7, meaning that a stable levelling effect can be attained relatively easily in a control sense. Although the latter apparatus is superior to the former tension leveler from that point of view, the
roller leveler 22 inherently requires not only a number of the work rolls 1', 2' having a relatively small diameter, but also backup rolls 3', 4' for respectively supporting those work rolls 1', 2'. - Because the backup rolls 3', 4' need to have sufficient strength to prevent the work rolls 1', 2' from bend, their diameter must be remarkably larger than that of the work rolls 1', 2'.
- With the work rolls 1', 2' arranged closely to each other, therefore, an installation space enough to accommodate the backup rolls 3', 4' cannot be secured. For that reason, it is usual that intermediate roll 3' or 4' is disposed in a straddling relation to plural (two) work rolls 1' or 2' so as to support the plural (two) work rolls by an intermediate roll. Alternatively, as disclosed in Japanese Patent Publication No. 48-44629, work rolls are independently supported by intermediate and backup roll arranged with a spacing therebetween in the lengthwise direction of the work rolls. More specifically, two rows of backup roll pairs are arranged at positions different from each other in the lengthwise direction of the work rolls such that one pair (group) of backup rolls support one work roll in an independent manner and the other pair (group) of backup rolls support another work roll, adjacent to the one work roll, in an independent manner.
- Generally, while the above-described tension leveler can relatively easily remove such deformation as edge waves and center buckles of treated materials (strip) through its levelling process, there occur a curl and a cross bow (gutter) by bending under tension, which residual curvatures remain even after levelling.
- To remove those residual curvatures, therefore, the strip is subjected to a roller leveler under a low-tension or no-tension state.
- Meanwhile, recent frequent use of those metallic strips, which are thin and hard material, has provided that the conventional roll arrangement cannot satisfactorily remove such residual curvatures.
- Where a strip plate has a thickness of 0.15 mm and a yield stress of 600 N/mm² (60 kgf/mm²), for example, a roller leveler requires work rolls having a diameter of about 16 mm. But, the roller leveler comprised of the so many and thin work rolls encounters difficulties in reforming at a high speed over 300 mpm. In high-speed lines, the diameter of each work roll is usually desirable to be in a range of about 30 to 40 mm from the standpoints such as of maintaining the roll accuracy and ensuring the roll's service life.
- In the case of handling the thin and hard strip, however, the roller leveler comprised of the work rolls having a diameter in a range of about 30 to 40 mm cannot produce any plastic strain due to bending and thus cannot offer any effect in reforming residual curvature, as will be seen from Fig. 8.
- On the other hand, it is also known that even in the thin and hard strip, a plastic strain effect can be attained by applying a tension and also imposing a deformation due to bending under the tension, as will be seen from Fig. 9.
- However, since the adjacent work rolls are contacted and coupled with each other via the backup roll as shown in Fig. 5 and a plastic elongation caused by that roller leveler produces a corresponding speed difference between portions of a strip held in contact with the inlet side work roll and the outlet side work roll, such a speed difference appears as a relative slip at any location in the roller leveler.
- The above relative slip due to a plastic elongation practically gives rise to few trouble in levelling at low-speed less than 300 mpm as practiced conventionally and, especially, no problem in equipment where the reforming is carried out under a wet condition using a cleaning liquid or the like.
- On the contrary, when the levelling is carried out in a high-speed range not less than 300 mpm, particularly, under a dry condition, the above relative slip due to a plastic elongation generates abnormal noise and causes damages, called chatter marks or scratch marks, on the strip, whereby the surface state of the strip is so greatly deteriorated as to impair its commercial value.
- Fig. 10 shows the relationship between a line speed and a noise level in the roller leveler of the type that one backup roll is disposed in a straddling relation to a plurality of work rolls as shown in Fig. 5. As will be seen from Fig. 10, when the line speed is regulated to increase, abnormal noise due to resonation has occurred in a range exceeding 500 mpm. Conversely, when the line speed is regulated to decrease, abnormal noise due to resonation has occurred until lowering down to 400 mpm. Note that although the occurrence of such abnormal noise is fluctuated to some extent depending on the size of the strip S, surface roughness and other properties, a similar tendency appears under any conditions.
- Meanwhile, where work rolls are independently supported by two groups of backup rolls arranged with a spacing therebetween in the lengthwise direction of the work rolls as disclosed in the above-cited Japanese Patent Publication No. 48-44629, the foregoing problem of the relative slip due to a plastic elongation will not occur, but there produces a difference in press force between the portion where the work rolls are supported by the backup rolls and the portion where they are not supported by the backup rolls because the work rolls are simply supported by the backup rolls at different positions from each other in the lengthwise direction of the work rolls. Such a difference appears as linear flaws on the surface of the strip, which impairs its commercial value.
- An object of the present invention is to provide a tension roller leveler by which stable curl and gutter reforming can be performed even in a high-speed range not less than 300 mpm without causing abnormal noise and vibration, while ensuring superior surface condition of a strip and final products with a high commercial value.
- According to the present invention, there is provided a tension roller leveler comprising an upper frame for mounting a plurality of upper work rolls thereon, a lower frame for mounting a plurality of lower work rolls thereon in opposite relation to said upper work rolls, and means for regulating relative positions of said upper frame and said lower frame to adjust opening degrees of said upper and lower work rolls in the inlet side and the outlet side for a strip, wherein said work rolls are each supported independently by one set of backup rolls in two rows, and said backup rolls in two rows are arranged in a zig-zag pattern such that axial positions of shaft support portions of said backup rolls in two rows will not overlap with each other.
- Fig. 1 is a schematic side view of an embodiment of the present invention.
- Fig. 2 is a schematic plan view showing an arrangement of backup rolls in the present invention.
- Fig. 3 is a side view of a roller leveler unit in the present invention.
- Fig. 4 is a schematic side view of a conventional tension leveler.
- Fig. 5 is a schematic side view of a combination of a conventional tension leveler and roller leveler.
- Fig. 6 is a graph showing the relationship between an amount of penetration and an amount of residual curvature in the conventional tension leveler.
- Fig. 7 is a graph showing the relationship between an amount of penetration and an amount of residual curvature in a combination of the conventional tension leveler and roller leveler.
- Fig. 8 is a graph showing stress distribution when a strip plate is subjected to bending under no tension.
- Fig. 9 is a graph showing stress distribution when a strip plate is subjected to bending under tension.
- Fig. 10 is a graph showing the relationship between a line speed and a noise level in the conventional tension roller leveler.
- Hereinafter, an embodiment of the present invention will be described with reference to Figs. 1 to 3.
- As shown in Fig. 1, upper work rolls 1a, 1b and
lower work rolls 2a, 2b arranged on the upper and lower sides of a strip S are supported to anupper roll support 5 and alower roll support 6 viabackup rolls - The upper work rolls 1a, 1b and the
lower work rolls 2a, 2b are each separately supported by a pair ofbackup roll rows backup roll rows work rolls 1a, 1b, 2a, 2b and joined to each other via bearing members (not shown) disposed between every adjacent divided rolls such that the total length is substantially equal to the length of thework rolls 1a, 1b, 2a, 2b. A pair of every twobackup roll rows lower work rolls 1a, 1b or 2a, 2b in an independent manner, respectively. - Then, the pairs of two
backup roll rows backup roll rows - The
upper roll support 5 and thelower roll support 6 are fixed to anupper frame 7 and alower frame 8, respectively, either one of which (thelower frame 8 in this embodiment) is supported in a movable manner. - More specifically, the
lower frame 8 is supported at its lower surface by rods 11a, 11b which are movable up and down byworm jacks 10a, 10b, respectively, whereby thelower frame 8 can be moved vertically and also tilted upon actuation of theworm jacks 10a, 10b. Accordingly, the work rolls 1a, 1b, 2a, 2b can be controlled to desirably adjust an amount of closing and opening degrees (penetration) of the inlet side work roll and the outlet side work roll. - Denoted at 12a, 12b are rollers rotatably supported on the opposite sides of the
lower frame 8. Theserollers rails 13a, 13b when thelower frame 8 is descended, thereby allowing thelower frame 8 to move laterally (in a direction normal to the drawing sheet of Fig. 3). - Denoted at 14a, 14b are bridle rolls respectively disposed on the inlet side and the outlet side of the
work rolls 1a, 1b, 2a, 2b for applying a predetermined tension to the strip S. - While the number of the
work rolls 1a, 1b, 2a, 2b is illustrated in this embodiment to be eleven in total, i.e., five for the upper work rolls plus six for the lower work rolls, the number of the work rolls may be of any desired one so long as the number of the upper work rolls is one more (or less) than that of the lower work rolls and the total number of both the work rolls is not less than five. - Further, it is desirable that the work rolls 1a, 1b, 2a, 2b have their diameters which are so selected as to gradually increase from the inlet side toward the outlet side of the roller leveler for the purpose of gradually decreasing the curvature of bending of the strip S.
- Operation of this embodiment will now be described.
- The strip S is moved to pass through the
work rolls 1a, 1b and 2a, 2b while undergoing a predetermined tension from thebridle rolls - Accordingly, the strip S is repeatedly subjected to bending under the tension and thus delivered from the inlet side toward the outlet side of the roller leveler while causing an elongation due to plastic strain, as explained above in connection with Fig. 9.
- Therefore, the path length of the strip S is changed between the every two work rolls adjacent to each other. With the present invention, however, the adjacent work rolls are each separately supported by a corresponding pair of backup roll rows so that the individual work rolls 1a, 1b, 2a, 2b are rotatable in an independent manner.
- If the adjacent work rolls are supported by a common single backup roll as with the prior art, those adjacent work rolls are held in slide contact with each other and the rotation of one work roll is mechanically fed back to the other work roll, thereby causing both the work rolls to be forced to rotate at the same speed. For that reason, where an extension of the strip S occurs between both the work rolls, a relative slip is necessarily caused at any location in the roller leveler unless a speed difference corresponding to the amount of such an elongation is provided. In contrast, with the present invention, the adjacent work rolls are mechanically separated from each other and separately rotatable, resulting in no possibility of the occurrence of such a relative slip.
- As described above, according to the present invention, since work rolls are each supported by one pair of backup rolls, even if a strip is repeatedly subjected to bending under tension in a tension leveler and thus extended so as to change the path length between the adjacent work rolls, the work rolls and the backup rolls can be rotated in an independent manner, whereby no relative slip is caused at any location in the tension leveler for absorbing an extension of the strip between the adjacent work rolls unlike the conventional tension roller leveler. Consequently, while the relative slip has produced abnormal noise due to abnormal resonation and has resulted in flaws called chatter marks in a conventional high-speed treatment line, any such abnormality will not occur in the present invention.
- Further, although the backup rolls are each formed by joining a plurality of rolls to each other in the lengthwise direction of the work rolls, a pair of backup rolls are arranged in a zig-zag pattern such that the bearing members of the divided rolls of one backup roll will not overlap with the bearing members of the divided rolls of the other. Therefore, the joints between the divided rolls of each backup roll will not be transferred to the surface of the strip via the work roll to appear as linear flaws. As a result, the tension roller leveler with superior stability in a high-speed range can be obtained.
Claims (3)
- A tension roller leveler comprising an upper frame (7) for mounting a plurality of upper work rolls (1a, 1b) thereon, a lower frame (8) for mounting a plurality of lower work rolls (2a, 2b) thereon in opposite relation to said upper work rolls (1a, 1b), and means (10a, 10b, 11a, 11b) for regulating relative positions of said upper frame (7) and said lower frame (8) to adjust opening degrees of said upper (1a, 1b) and lower work rolls (2a, 2b) in the inlet side and the outlet side for a strip (S), wherein said work rolls are each supported independently by one set of backup rolls (3a, 3b, 4a, 4b) in two rows, and said backup rolls (3a, 3b, 4a, 4b) in two rows are arranged in a zig-zag pattern such that axial positions of shaft support portions of said backup rolls (3a, 3b, 4a, 4b) in two rows will not overlap with each other.
- A tension roller leveler according to claim 1, wherein one set of said backup rolls (3a, 3b, 4a, 4b) in two rows are brought into contact with said work roll (1a, 2a) over substantially the entire length.
- A tension roller leveler according to claim 1 or 2, wherein said tension leveler has a reform speed not lower than 350 mpm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10651591A JPH0576934A (en) | 1991-04-12 | 1991-04-12 | Tension roller leveler |
JP106515/91 | 1991-04-12 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0508475A2 EP0508475A2 (en) | 1992-10-14 |
EP0508475A3 EP0508475A3 (en) | 1992-12-02 |
EP0508475B1 true EP0508475B1 (en) | 1995-02-15 |
Family
ID=14435554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920106289 Revoked EP0508475B1 (en) | 1991-04-12 | 1992-04-10 | Tension roller leveler |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0508475B1 (en) |
JP (1) | JPH0576934A (en) |
CA (1) | CA2065801C (en) |
DE (1) | DE69201395T2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1275446A2 (en) † | 2001-05-22 | 2003-01-15 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Method and apparatus for eliminating of gutter curvatures in metal sheets |
DE102016106208A1 (en) | 2016-04-05 | 2017-10-05 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Method for stretch bending of a strip |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4323385C1 (en) * | 1993-07-13 | 1995-01-19 | Bwg Bergwerk Walzwerk | Method for eliminating transverse curvatures in metal strips, in particular thin metal strips up to 2.0 mm thick |
WO2011029485A1 (en) * | 2009-09-09 | 2011-03-17 | Siemens Vai Metals Technologies Sas | Levelling machine with multiple rollers |
US9505045B2 (en) * | 2012-11-29 | 2016-11-29 | Jp Steel Plantech Co. | Leveler equipment and sheet material flattening method |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT314453B (en) * | 1971-07-09 | 1974-04-10 | Bwg Bergwerk Und Walzwek Masch | Method and device for reducing sheet metal strips in strip lines |
JPS5118016B2 (en) | 1971-10-08 | 1976-06-07 | ||
JPS5214568A (en) * | 1975-07-26 | 1977-02-03 | Ube Industries | Tension roller leveller |
DE2536582C3 (en) * | 1975-08-16 | 1979-08-09 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg | Interchangeable crossbeam |
DE3234160C2 (en) * | 1982-09-15 | 1986-10-23 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg | Method and hot strip mill for producing thin metal strip, in particular metal wide strip, from hot strip |
JPH0220618A (en) * | 1988-07-06 | 1990-01-24 | Hitachi Ltd | Roller leveler |
-
1991
- 1991-04-12 JP JP10651591A patent/JPH0576934A/en active Pending
-
1992
- 1992-04-10 DE DE1992601395 patent/DE69201395T2/en not_active Revoked
- 1992-04-10 EP EP19920106289 patent/EP0508475B1/en not_active Revoked
- 1992-04-10 CA CA 2065801 patent/CA2065801C/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1275446A2 (en) † | 2001-05-22 | 2003-01-15 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Method and apparatus for eliminating of gutter curvatures in metal sheets |
EP1275446B2 (en) † | 2001-05-22 | 2013-09-04 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Method for eliminating of gutter curvatures in metal sheets |
DE102016106208A1 (en) | 2016-04-05 | 2017-10-05 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Method for stretch bending of a strip |
Also Published As
Publication number | Publication date |
---|---|
JPH0576934A (en) | 1993-03-30 |
CA2065801A1 (en) | 1992-10-13 |
EP0508475A3 (en) | 1992-12-02 |
DE69201395D1 (en) | 1995-03-23 |
EP0508475A2 (en) | 1992-10-14 |
DE69201395T2 (en) | 1995-08-03 |
CA2065801C (en) | 1999-08-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2614642C2 (en) | Device on a roll stand to improve the flatness of a metal strip during rolling | |
US4898013A (en) | Installation for levelling a metal strip | |
US4711116A (en) | Method of operating a four-high roll stand with bendable and axially shiftable rolls | |
EP0508475B1 (en) | Tension roller leveler | |
KR100530623B1 (en) | Roll stand for rolling strip and method of rolling strips | |
JPH0824958B2 (en) | Roller leveler | |
JP3924276B2 (en) | Straightening method for thin wide plate | |
JPH0521653B2 (en) | ||
JPH09225531A (en) | Roller leveler for thick steel plate | |
JPH0534096B2 (en) | ||
JPS6328688B2 (en) | ||
JPH07328713A (en) | Method for preventing edge wave of steel sheet and device therefor | |
JPH08168806A (en) | Plate rolling device and its rolling method | |
JPS62199220A (en) | Roller leveler | |
JP3314955B2 (en) | Roller leveler | |
JPH024375B2 (en) | ||
JP2000176504A (en) | Skin-pass mill for hot-rolled steel strip | |
JPH08174065A (en) | Roller leveller | |
JP3268038B2 (en) | Laura Leveler | |
JPH0688063B2 (en) | Strip steel skin pass mill | |
JPH0576388B2 (en) | ||
JPH0233444B2 (en) | ||
JP2585608B2 (en) | Tension Lo-La Revela | |
EP0199017A2 (en) | Tension levelling strip material | |
JPS6230045B2 (en) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): DE FR GB |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): DE FR GB |
|
17P | Request for examination filed |
Effective date: 19930324 |
|
17Q | First examination report despatched |
Effective date: 19940407 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB |
|
REF | Corresponds to: |
Ref document number: 69201395 Country of ref document: DE Date of ref document: 19950323 |
|
ET | Fr: translation filed | ||
PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
26 | Opposition filed |
Opponent name: BWG BERGWERK- UND WALZWERK-MASCHINENBAU GMBH Effective date: 19951028 |
|
PLBF | Reply of patent proprietor to notice(s) of opposition |
Free format text: ORIGINAL CODE: EPIDOS OBSO |
|
PLBF | Reply of patent proprietor to notice(s) of opposition |
Free format text: ORIGINAL CODE: EPIDOS OBSO |
|
PLBF | Reply of patent proprietor to notice(s) of opposition |
Free format text: ORIGINAL CODE: EPIDOS OBSO |
|
PLBO | Opposition rejected |
Free format text: ORIGINAL CODE: EPIDOS REJO |
|
APAC | Appeal dossier modified |
Free format text: ORIGINAL CODE: EPIDOS NOAPO |
|
APAE | Appeal reference modified |
Free format text: ORIGINAL CODE: EPIDOS REFNO |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19980401 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19980409 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19980417 Year of fee payment: 7 |
|
APAC | Appeal dossier modified |
Free format text: ORIGINAL CODE: EPIDOS NOAPO |
|
RDAH | Patent revoked |
Free format text: ORIGINAL CODE: EPIDOS REVO |
|
RDAG | Patent revoked |
Free format text: ORIGINAL CODE: 0009271 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: PATENT REVOKED |
|
27W | Patent revoked |
Effective date: 19980618 |
|
GBPR | Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state |
Free format text: 980618 |
|
APAH | Appeal reference modified |
Free format text: ORIGINAL CODE: EPIDOSCREFNO |