EP0040653B1 - Method for preventing wandering of strip under roller leveling in hot rolling line - Google Patents
Method for preventing wandering of strip under roller leveling in hot rolling line Download PDFInfo
- Publication number
- EP0040653B1 EP0040653B1 EP19800301621 EP80301621A EP0040653B1 EP 0040653 B1 EP0040653 B1 EP 0040653B1 EP 19800301621 EP19800301621 EP 19800301621 EP 80301621 A EP80301621 A EP 80301621A EP 0040653 B1 EP0040653 B1 EP 0040653B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- leveler
- roll
- angle
- hot
- 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.)
- Expired
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
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/021—Control or correction devices in association with moving strips
- B21D43/023—Centering devices, e.g. edge guiding
-
- 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
- B21B1/26—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 hot-rolling, e.g. Steckel hot mill
-
- 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
- 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
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
-
- 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
- B21B2015/0057—Coiling the rolled product
-
- 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
- B21B2015/0071—Levelling the rolled product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/006—Pinch roll sets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
Definitions
- the insufficient flatness of the hot rolled steel strips caused defective appearance of coil which presented noticeable problems in the succeeding producing steps such as, for example in the case of mother material for cold rolling, decrease in pickling efficiency resulted from decrease in passability of plates in the pickling line and wandering of the strip.
- the strip used in this test was a common hot-rolled steel strip of thickness of 1.2-3.2 mm and width of 900-1300 mm.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
- Metal Rolling (AREA)
Description
- The present invention relates to a method for preventing wandering of a strip in a hot rolling line and, more particularly, to a method for correcting hot rolled strip in which shape defects of the hot rolled strip are corrected in the hot rolling line and the wandering of the strip during the correction is prevented.
- Demands for increased flatness of hot rolled strip have recently become more and more severe, and now, if only the flatness is secured, hot rolled strips can be used in place of more expensive cold rolled strips.
- In the manufacture of steel strips by a continuous hot rolling mill, the relatively large distance between the final mill stand of the finishing mill and the coiler presented a problem that the strip bottom having passed the final finishing stand, became under zero tension and fluttered. The fluttering of the strip bottom was a cause for such shape defects as out of flatness, edge defect, and edge break and defective appearance of coil.
- For this reason, hot rolled strips were, after rolling in the continuous hot rolling mill, temper- rolled and simultaneously corrected in flatness. If the hot strip produced by such mill had satisfactory flatness it would have been possible to eliminate the temper rolling step. Heretofore, however, it was necessary to render the temper rolling to obtain the required flatness of the hot rolled strips.
- As mentioned above, the insufficient flatness of the hot rolled steel strips caused defective appearance of coil which presented noticeable problems in the succeeding producing steps such as, for example in the case of mother material for cold rolling, decrease in pickling efficiency resulted from decrease in passability of plates in the pickling line and wandering of the strip.
- One attempt to solve such problems is described in DE-Al-2 537 188, which shows a plurality of leveler rolls positioned between a finishing mill and a coiler.
- Another suggested solution appears in DE-A-2 123 896 wherein leveler rolls of the same type are provided, the upper rolls being angularly pivotable in the vertical direction, the lower rolls being translationally moveable toward and away from each other.
- To overcome these problems, the inventors previously presented a method in which a hot roller leveler is provided between the final finishing mill and the coiler, so that the flatness of the hot rolled steel strip is corrected by the roll force of the hot roller leveler and the tension between the finishing mill and the coiler (Japanese Patent Publication No. 48182/78 which issued as Japanese Patent No. 968053).
- We have confirmed that our previous method mentioned above sharply reduced the shape defects of strips such as center buckles and edge waves. However, in the cases where the thickness distribution of the strip in the widthwise direction is not symmetrical, where the rolled shape is extremely asymmetrical, where the temperature distribution of the strip is asymmetrical (mainly due to unsatisfactory spray), and where the parallelism among the units of the rolling line is not complete (it is difficult to maintain complete parallelism among the units throughout the long rolling line), the leveling of the strip by the hot roller leveler sometimes caused the strip to wander sideways so violently that the strip edge hit the support members (side guide etc.) to thereby cause edge defects and, in the extreme case, make the coiling operation impossible.
- Accordingly, an object of the present invention is to prevent wandering of a strip under roller leveling in a hot rolling line, thereby stabilizing the flatness correction of the strip and improving the coil appearance of the strip.
- In the method according to the present invention, in order to achieve the object, at least one hot roller leveler comprising a plurality of leveler rolls is provided between the finishing rolling mill and the coiler of the hot rolling line to correct the flatness of the hot strip. The hot roller leveler is constructed as follows:
- at least one leveler roll is supported adjustably in angle in a horizontal plane with respect to the strip and at least one other leveler roll is supported adjustably in angle in a vertical plane with respect to the strip,
- in another embodiment, at least one leveler roll is supported adjustably in angle in a horizontal plane and in a vertical plane, respectively, with respect to the strip.
- Further, a side guide is provided on an entrance side, or on an exit side, or on both sides, of one or more hot roller levelers constructed as described above, to prevent the wandering of the strip.
- The invention will be better understood from the following description taken in connection with the accompanying drawings in which:
- Figs. 1 and 2 are illustrations of the finishing mill and subsequent steps of a hot rolling line in which the method according to the present invention is applied;
- Fig. 3 is a plan view of a leveler roll arranged adjustably in angle in a horizontal plane with respect to the strip;
- Fig. 4 is a plan view of a leveler roll arranged adjustably in angle in a vertical plane with respect to the strip;
- Fig. 5 is a side view taken from the line V-V of Fig. 4;
- Fig. 6 is a plan view of a leveler roll arranged adjustably in angle in a horizontal plane and in a vertical plane with respect to the strip;
- Fig. 7 is a graph showing the wandering correcting effect by the method according to the present invention;
- Fig. 8 is a schematic side view of another embodiment of the hot roller leveler used in the method according to the present invention;
- Fig. 9 is a graph similar to that of Fig. 7, showing other wandering correcting effect;
- Fig. 10 is a plan view of a roller type side guide adjustable in position, used in the method according to the present invention;
- Fig. 11 is a front view taken from the line XI-XI of Fig. 10;
- Fig. 12 is a plan view of a plate type side guide adjustable in position, used in the method according to the present invention;
- Fig. 13 is a front view taken from the line XIII-XIII of Fig. 12;
- Figs. 14 to 16 are illustrations of examples of arrangements in which a roller leveler is provided with one or more side guides; and
- Figs. 17 to 19 are illustrations of examples of arrangements in which a plurality of roller levelers are provided with one or more side guides.
- With reference now to the drawings and more particularly to Figs. 1 and 2 thereof, there are schematically illustrated examples of a final mill stand and subsequent steps in the hot rolling line. In the method according to the present invention, as shown, one or more
hot roller levelers 3 are provided between a final mill stand 1 of a finishing mill and acollar 5 in the hot rolling line. Astrip 6 having emerged from thefinal stand 1 of the finishing mill passes a coolingwater spray zone 2, is leveled by thehot roller leveler 3, passes throughpinch rolls 4, and is coiled by thecoiler 5. In this hot rolling line, thehot roller leveler 3 is provided in the neighbourhood of thecoiler 5 and preferably immediately before thepinch rolls 4. - The
hot roller leveler 3 comprising a plurality of (three in the illustrated examples)leveler rolls 31 is provided in a single unit (Fig. 1) or in a plurality of units (Fig. 2). - In the method according to the present invention, the
hot roller leveler 3 is constructed as follows: - a. At least one
leveler roll 31 is supported adjustably in angle in a horizontal plane with respect to thestrip 6 and at least oneother leveler roll 31 is supported adjustably in angle in a vertical plane with respect to the strip 6 (Fig. 6). - b. In another embodiment, at least one
leveler roll 31 is supported adjustably in angle in a horizontal plane and in a vertical plane, respectively, with respect to the strip 6 (Fig. 6). - Adjustment of angle of the
leveler roll 31 in the horizontal plane is accomplished by, for example, the construction shown in Fig. 3, in which one bearing 7a of theleveler roll 31 is a pivot bearing and theother bearing 7b thereof is so constructed as to be slidably movable in the horizontal direction and is connected to ahydraulic cylinder 8 maintained horizontal. - The adjustment of angle of the
leveler roll 31 in the vertical plane is accomplished by, for example, the construction shown in Figs. 4 and 5, in which one bearing 7c of theleveler roll 31 is so supported as to be pivotally movable in the vertical plane and the other bearing 7d is connected to thehydraulic cylinder 8 maintained vertical. - The adjustment of angle of the
leveler roll 31 in the horizontal plane and in the vertical plane, respectively, is accomplished by, for example, the construction shown in Fig. 6, in which thebearings bearings - The construction shown in Fig. 1 in which one unit of the
roller leveler 3 comprising the threeleveler rolls 31 is provided between thefinishing mill 1 and thecoiler 5, will now be described in detail for the purpose of confirming the effects of each of the rolls. From an idealistic viewpoints, however, use of a hot roller leveler having more rolls is preferable since the more the number of the rolls is, the higher effects are obtained thereby in flatness correction and descaling of the strip. The roller leveler may be of a four-high type having back-up rolls for supporting deflection of the work rolls or may be of a two-high type having only the work rolls. - In the
hot roller leveler 3 shown in Fig. 1, the wandering of thestrip 6 traveling on the line can be corrected by adjusting the angle of theleveler roll 31 positioned on the upper side of the strip in combination with one or two of the twoleveler rolls - Fig. 7 shows the results of test on the relation between an angle of inclination in a horizontal plane of the
leveler roll 31 and an amount of wandering Ax of thestrip 6. In Fig. 7, the horizontal axis denotes the angle ofinclination 9 of the roll and the vertical axis denotes the amount of wandering per unit time Δx/Δt. - The strip used in this test was a common hot-rolled steel strip of thickness of 1.6-3.2 mm and width of 900-1300 mm. In Fig. 7, A indicates the case in which only the leveler roll 31 positioned at the left on the under side of the
strip 6 was adjusted in angle, B indicates the case in which only the leveler roll 31 positioned on the upper side of thestrip 6 was adjusted in angle, and C denotes the case in which all the three leveler rolls 31, 31, 31 were adjusted in angle. - Fig. 7 shows that in any of the cases, the greater the angle of
inclination 0 of the roll is, the greater becomes the amount of wandering Ax of thestrip 6 and that when the angle ofinclination 0 of the roll varies in the reverse direction, the amount of wandering Ax of the strip also varies in the reverse direction. Fig. 7 shows further that the effect by adjustment of the angle of the leveler roll is greater in the intermediate roll than in the roll on the entrance or exit side and that the greatest effect is achieved by adjusting the angles of all the rolls. - Accordingly, in the method according to the present invention, the wandering of the strip can be canceled and prevented by adjusting the angle of at least one of the three
leveler rolls 31 with thestrip 6 in the horizontal plane. - Fig. 9 shows the results of test on the relation between the angle of
inclination 0 of the roll and the amount of wandering Ax of thestrip 6 in the hot roller leveler having fiveleveler rolls 31 as shown in Fig. 8. In Fig. 9, the vertical and the horizontal axes denote the same items as in Fig. 7. In Fig. 9, D denotes the case in which one leveler roll 31 positioned at the left on the under side of thestrip 6 is inclined in the vertical plane, E denotes the case in which one leveler roll 31 positioned at the left on the upper side of thestrip 6 is inclined in the vertical plane, F denotes the case in which both saidleveler rolls strip 6 is inclined in the vertical plane and oneleveler roll 31 positioned at the right on the under side of thestrip 6 is simultaneously inclined in the horizontal plane. - The strip used in this test was a common hot-rolled steel strip of thickness of 1.2-3.2 mm and width of 900-1300 mm.
- Fig. 9 shows that in any of the cases, the greater the angle of
inclination 0 of the roll is, the greater becomes the amount of wandering Ax of the strip and that when the angle ofinclination 0 of the roll varies in the reverse direction, the amount of wandering Ax of the strip also varies in the reverse direction. Fig. 9 shows further that the effect by adjustment of the angle of the leveler roll is greater in the intermediate roll than in the roll on the entrance or exit side and that the effect is enhanced by combining the adjustment of the angle of inclination of the roll in the vertical plane with the adjustment of the angle of inclination of the roll in the horizontal plane. - One reason for combining the adjustment of angle of inclination of the roll in the vertical plane with that in the horizontal plane is that when the roll to be adjusted in the vertical plane is inclined at a large angle in the vertical plane the intermesh of the leveler roll varies from an edge of the strip to the other, and if the angle of inclination of the roll in the vertical plane is made large when the amount of wandering of the strip is large the shape of the strip at one edge will be changed into, for example, edge wave to cause shape defects. For this reason, angle of inclination of the roll in the vertical plane is preferably made small and the adjustment thereof is preferably combined with the adjustment of the angle of inclination of the roll in the horizontal plane.
- Practically, it is simplest and most effective to incline the entire leveler unit in the horizontal and/or the vertical planes.
- In the method according to the present invention described hereinabove, by adjusting the angle of inclination of the leveler roll so as to cancel the wandering of the steel strip during hot rolling thereof, it is made possible to move the strip centrally of the line to thereby prevent the edges of the strip from hitting against the guides to cause edge defect and to thereby enable the strip to be leveled stably.
- While the foregoing description is made with reference to the example in which the
hydraulic cylinder 8 is used as the means for inclining the leveler rolls 31, it will be obvious to those skilled in the art that thehydraulic cylinder 8 may be replaced by any other suitable inclining means such, for example, as a rack and pinion mechanism and a link and lever mechanism. - For safer and securer prevention of wandering of the steel strip, it is preferable to use a position-adjustable roller
type side guide 9 as shown in Figs. 10 and 11 or a position-adjustable platetype side guide 10 as shown in Figs. 12 and 13. - In the construction including only one unit of the
hot roller leveler 3, theside guide - In the construction including a plurality of the
roller levelers 3, theside guide side guide - In the method according to the present invention, as described hereinabove, severe wandering of the steep strip is forcibly restrained by adjusting the angle of inclination of the
leveler roll 31 and shifting the strip quickly to the central zone of the line while holding the edges of thestrip 6 with theside guide - By increasing the intermesh of the leveler rolls and effectively utilizing the leveler as back tension means for coiling after the coil end passes through the final mill stand, it is made possible to obtain effects such as prevention of edge break and other edge defects resulted from the zero tension state after the passing of the coil end through the final mill stand and as grade up of the coiling form.
- The leveling operation according to the present invention can be easily automated by providing a sensor of the amount of wandering of the strip and connecting the output of the sensor to the means for adjusting the angle of the leveler roll.
- Further, the method according to the present invention provides additional advantages such as increase in descaling effect leading to increase in efficiency of the pickling line because the scale on the surface of the hot rolled strip is easily cracked by repeat bendings under tension width leveler rolls.
Claims (4)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8080301621T DE3066142D1 (en) | 1980-05-16 | 1980-05-16 | Method for preventing wandering of strip under roller leveling in hot rolling line |
EP19800301621 EP0040653B1 (en) | 1980-05-16 | 1980-05-16 | Method for preventing wandering of strip under roller leveling in hot rolling line |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19800301621 EP0040653B1 (en) | 1980-05-16 | 1980-05-16 | Method for preventing wandering of strip under roller leveling in hot rolling line |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0040653A1 EP0040653A1 (en) | 1981-12-02 |
EP0040653B1 true EP0040653B1 (en) | 1984-01-18 |
Family
ID=8187165
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19800301621 Expired EP0040653B1 (en) | 1980-05-16 | 1980-05-16 | Method for preventing wandering of strip under roller leveling in hot rolling line |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0040653B1 (en) |
DE (1) | DE3066142D1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0796686B2 (en) * | 1986-09-09 | 1995-10-18 | 川崎製鉄株式会社 | Metal strip meandering prevention method |
DE19520541C2 (en) * | 1995-06-03 | 1999-01-14 | Bwg Bergwerk Walzwerk | Method and device for correcting a rolled metal strip which is bent horizontally in the strip plane, in particular a metal strip with a strip thickness of 0.5 mm to 2.0 mm |
DE102017112424B4 (en) | 2017-06-06 | 2023-02-23 | Emg Automation Gmbh | Device and method for strip position control |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3438231A (en) * | 1967-02-28 | 1969-04-15 | Manhattan Terrazzo Brass Strip | Method and apparatus for removing edge camber from strips |
AT302001B (en) * | 1970-10-20 | 1972-09-25 | Voest Ag | Device for straightening sheet metal strips |
US3902648A (en) * | 1973-12-28 | 1975-09-02 | Interlake Inc | Variable width strip conditioner |
DE2537188C3 (en) * | 1975-08-21 | 1978-05-18 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg | Method and device for the production of hot strip with improved quality properties |
DE2706943C2 (en) * | 1977-02-18 | 1982-06-09 | 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 |
DE2742043A1 (en) * | 1977-09-19 | 1979-04-05 | Rheinische Eisengiesserei Wilh | Straightening rollers for coiled metal strip or sheet - has adjustment for metal thickness provided by sliding wedges and screwed rod |
-
1980
- 1980-05-16 EP EP19800301621 patent/EP0040653B1/en not_active Expired
- 1980-05-16 DE DE8080301621T patent/DE3066142D1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE3066142D1 (en) | 1984-02-23 |
EP0040653A1 (en) | 1981-12-02 |
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