EP0072385B1 - Four high mill of paired-roll-crossing type - Google Patents
Four high mill of paired-roll-crossing type Download PDFInfo
- Publication number
- EP0072385B1 EP0072385B1 EP19810730074 EP81730074A EP0072385B1 EP 0072385 B1 EP0072385 B1 EP 0072385B1 EP 19810730074 EP19810730074 EP 19810730074 EP 81730074 A EP81730074 A EP 81730074A EP 0072385 B1 EP0072385 B1 EP 0072385B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roll
- rolls
- work
- housing
- bearing cases
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
- B21B13/023—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally the axis of the rolls being other than perpendicular to the direction of movement of the product, e.g. cross-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
- B21B2203/06—Cassettes
Definitions
- This invention relates to improvements in a four high mill of a paired-roll-crossing type.
- a mill according to the first part of the main claim is known from the FR-A-1413732 and partly from the CH-A-295443.
- Those rclling mills include means for separately setting the left and right roll gaps, oil hydraulic jacks for roll bending, and a paired-roll-crossing mechanism which can be adjusted to move the pair of the upper work roll and backup roll and the pair of the lower work roll and backup roll to cross each other at predetermined angles with respect to a line normal to the rolling direction. In this way they can attain the end described above.
- This invention is aimed at overcoming the drawbacks of the proposed mills, and it provides a four high mill of a paired-roll-crossing type which comprises a housing, an upper and a lower backup roll bearing cases held within the housing, an upper and a lower equalizer beams in contact, respectively, with the uppermost and lowermost surfaces of said bearing cases and made both movable upwardly and downwardly, pairs of work rolls and backup rolls in four high arrangement, upper and lower work roll chocks installed inside said bearing cases characterized in that roll-crossing means are mounted in said housing to turn said bearing cases about a common vertical axis on the same horizontal plane so that said upper and lower pairs of rolls can cross each other, and means for separately setting the left and right roll gaps between said upper and lower work rolls.
- work roll bending means may be mounted at both ends of the work rolls.
- the numeral 1 indicates a slab or strip of steel to be rolled by a pair of work rolls 2, 2', which are held one above another and supported, respectively, by work roll chocks 6, 6' as shown.
- a pair of backup rolls 3, 3' in rolling contact with the non-working sides of the work rolls 2, 2', are held within upper and lower bearing cases 7, 7' for the backup rolls.
- the pair of screw-down devices 11 equipped with the screws 4 constitute means for separately setting the left and right roll gaps as desired between the upper and lower work rolls 2, 2'.
- the upper and lower backup roll bearing cases 7, 7' are held in a suitably spaced relation within the housing 8 so they may move upwardly and downwardly along the housing frames and also, as will be described later, they may turn about their common vertical axis.
- the upper and lower work roll chocks 6, 6' are vertically slidably housed in the upper and lower backup roll bearing cases 7, 7'.
- Between the both ends of the backup roll bearing cases 7, 7' and those of the work roll chocks 6, 6' are interposed roll-bending devices (oil hydraulic jacks) 5, as shown in Fig. 1.
- equalizer beams 21,21' are disposed between the upper backup roll bearing case 7 and the screws 4 and between the lower bearing case 7' and the hydraulic reduction cylinders 10, which are movable upwardly and downwardly but are horizontally constrained unmovably by the inner walls of the housing 8.
- Jacks 13a, 13b, 13c, and 13d are supported by brackets 20, 20', which in turn are provided, as shown, on the upper and lower portions on both sides of the housing 8. These jacks are operated so as to turn the upper and lower backup roll bearing cases 7, 7' on the same horizontal planes about their common vertical axis.
- the brackets 20, 20' combine with the jacks 13a to 13d to constitute roll-crossing devices disposed in the housing 8.
- the numeral 15 designates a cylinder for balancing the inner housing, mounted on top of the housing 8, with a rod 14 suspending the top roll assembly.
- Radial bearings 16, 16' for the work rolls 2, 2' are supported themselves by the work roll chocks 6, 6'.
- the work rolls 2, 2' (Fig. 3 showing only the roll 2' for simplicity) are supported at one ends by thrust pads 18 through thrust bearings 17.
- the thrust pads 18 are secured to the upper and lower backup roll bearing cases 7, 7' with chock plates 19.
- the line V-V be the centerline of width of a slab or strip being passed through the rolls (hereinafter called the "passing line")
- the line X-X be a straight line that extends across the middle point of length of the rolls and parallel to the passing line V-V
- the line Y-Y be a straight line at right angles to the line X-X
- the intersection of the passing line V-V and the line Y-Y be W.
- the initial roll gaps c ⁇ , e 2 between the upper and lower work rolls 2, 2' can be adjusted by suitably operating the left and right screw-down devices 11. Also, proper control of the roll-bending forces F 1' F 2 is made possible by the roll-bending devices 5.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Metal Rolling (AREA)
Description
- This invention relates to improvements in a four high mill of a paired-roll-crossing type.
- A mill according to the first part of the main claim is known from the FR-A-1413732 and partly from the CH-A-295443.
- In recent years the demand for accuracy of thickness in the width direction of rolled metals has become more and more exacting. The demand has been met by initial crowning of rolls for rolling mills to make up for the deflections of the rolls under rolling load. This counter-measure necessitates having a large variety of initially crowned rolls in reserve, since the rolls must be replaced by those crowned otherwise whenever the rolling condition, such as the width or thickness or both of the slab or strip, are to be changed. The replacement of rolls lowers the rate of mill operation. Moreover, the crowning effect on rolls is highly variable because of the wear and thermal expansion of the rolls with the progress of rolling operation. For these reasons there has been an incessant need in the art for means of controlling the thickness of the workpiece width- ways on rolling mills without the necessity of changing the rolls.
- As a solution to this control problem, bending of the wor rolls has been proposed and has proved fairly effective. However, the strengths of the work roll shafts place limits upon the bending forces applicable, and the roll-bending method is not satisfactorily capable of correcting the thickness ununiformity in the width direction of the workpiece. Especially where the mill has a relatively narrow rolling width for the length of rolls, the end cannot be fully achieved in most cases because of the interference by the contacting ends of the backup rolls and work rolls.
- Therefore, the introduction of a rolling mill has been urgently called for which can freely control the thickness of the metal widthwise according to changes in the given rolling conditions, while using the same rolls.
- Another disadvantage of the prior art is the necessity of frequently replacing the mill rolls, especially the work rolls, due to rapid wear on rolling operations. Conventional mills are designed to receive slabs or strips in such a manner that the middle point of the roll length matches the center of width of each passing piece. Consequently, the middle portions of the rolls wear faster than the end portions, and a common practice has been to remove each roll for replacement when its middle portion has worn beyond a predetermined limit. This means that the roll must be dismounted when its both ends are yet to reach the wear limits. The short life and frequent replacement of the rolls have lowered the rate of mill operation, and this has combined with the economical loss due to roll wear to have a serious effect upon the cost of product.
- Thus, with the view to eliminating the disadvantages of the conventional rolling mills, this applicant has already proposed novel four high mills, as disclosed in the specifications (with drawings) of copending Japanese Patent Application Nos. 138837/1978 Publication numbers 55064908 and 55153605) and 59327/1979, which are capable of controlling the thickness extensively widthwise of the workpiece using the same rolls and more than doubling their ordinary spans of life.
- Those rclling mills, of the four high type, include means for separately setting the left and right roll gaps, oil hydraulic jacks for roll bending, and a paired-roll-crossing mechanism which can be adjusted to move the pair of the upper work roll and backup roll and the pair of the lower work roll and backup roll to cross each other at predetermined angles with respect to a line normal to the rolling direction. In this way they can attain the end described above.
- However, when the paired-roll-crossing mechanism is adjusted to turn the upper and lower pairs of rolls to the points where they cross at certain angles to a line normal to the rolling direction, there will occur horizontal deviations of the center points of the upper backup roll bearings and those of the reduction screws, away from each other. Bending moments corresponding to the amounts of deviations will develop in the screws, adversely affecting the screw operation. Similarly, the center points of the lower backup roll bearings and those of reduction cylinders undergo relative horizontal deviations, producing bending moments in the cylinders, too, and thereby having unfavorable effects upon the same.
- This invention is aimed at overcoming the drawbacks of the proposed mills, and it provides a four high mill of a paired-roll-crossing type which comprises a housing, an upper and a lower backup roll bearing cases held within the housing, an upper and a lower equalizer beams in contact, respectively, with the uppermost and lowermost surfaces of said bearing cases and made both movable upwardly and downwardly, pairs of work rolls and backup rolls in four high arrangement, upper and lower work roll chocks installed inside said bearing cases characterized in that roll-crossing means are mounted in said housing to turn said bearing cases about a common vertical axis on the same horizontal plane so that said upper and lower pairs of rolls can cross each other, and means for separately setting the left and right roll gaps between said upper and lower work rolls.
- In a further embodiment work roll bending means may be mounted at both ends of the work rolls.
- Other objects and advantages of the present invention will become apparent when an embodiment thereof is considered in connection with the accompanying drawing, in which:
- Fig. 1 is a diagrammatic front view of an embodiment of the invention;
- Fig. 2 is a diagrammatic side view of the embodiment; and
- Fig. 3 is a sectional view taken along line III-III of Fig. 1.
- Throughout the figures the numeral 1 indicates a slab or strip of steel to be rolled by a pair of
work rolls 2, 2', which are held one above another and supported, respectively, bywork roll chocks 6, 6' as shown. A pair ofbackup rolls 3, 3', in rolling contact with the non-working sides of thework rolls 2, 2', are held within upper and lower bearingcases 7, 7' for the backup rolls. On tops ofhousing frames 8, joined together at the bottoms byshoe plates 9, are mounted a pair of screw-downdevices 11 equipped with ascrew 4 each. Near the lower ends of thehousing frames 8, there are installed a pair ofhydraulic reduction cylinders 10. - The pair of screw-down
devices 11 equipped with thescrews 4 constitute means for separately setting the left and right roll gaps as desired between the upper andlower work rolls 2, 2'. - The upper and lower backup
roll bearing cases 7, 7' are held in a suitably spaced relation within thehousing 8 so they may move upwardly and downwardly along the housing frames and also, as will be described later, they may turn about their common vertical axis. As illustrated, the upper and lowerwork roll chocks 6, 6' are vertically slidably housed in the upper and lower backuproll bearing cases 7, 7'. Between the both ends of the backuproll bearing cases 7, 7' and those of thework roll chocks 6, 6' are interposed roll-bending devices (oil hydraulic jacks) 5, as shown in Fig. 1. - Also, between the upper backup
roll bearing case 7 and thescrews 4 and between the lower bearing case 7' and thehydraulic reduction cylinders 10, there are disposedequalizer beams 21,21', respectively, which are movable upwardly and downwardly but are horizontally constrained unmovably by the inner walls of thehousing 8. - Jacks 13a, 13b, 13c, and 13d are supported by
brackets 20, 20', which in turn are provided, as shown, on the upper and lower portions on both sides of thehousing 8. These jacks are operated so as to turn the upper and lower backuproll bearing cases 7, 7' on the same horizontal planes about their common vertical axis. Thebrackets 20, 20' combine with thejacks 13a to 13d to constitute roll-crossing devices disposed in thehousing 8. - The
numeral 15 designates a cylinder for balancing the inner housing, mounted on top of thehousing 8, with arod 14 suspending the top roll assembly.Radial bearings 16, 16' for thework rolls 2, 2' are supported themselves by thework roll chocks 6, 6'. The work rolls 2, 2' (Fig. 3 showing only the roll 2' for simplicity) are supported at one ends by thrust pads 18 through thrust bearings 17. The thrust pads 18 are secured to the upper and lower backuproll bearing cases 7, 7' withchock plates 19. - Throughout the figures the
numerals 12, 12' indicate upper and lower inner housings. - The construction of the four high mill of a paired-roll-crossing type embodying the invention has so far been described. Now as indicated in Fig. 3, let the line V-V be the centerline of width of a slab or strip being passed through the rolls (hereinafter called the "passing line"), the line X-X be a straight line that extends across the middle point of length of the rolls and parallel to the passing line V-V, the line Y-Y be a straight line at right angles to the line X-X, and the intersection of the passing line V-V and the line Y-Y be W. Then, the operation of the
jacks roll bearing cases 7, 7' to turn horizontally with respect to the given point W on the line Y-Y, thus turning the upper andlower rolls - The initial roll gaps c↑, e2 between the upper and
lower work rolls 2, 2' can be adjusted by suitably operating the left and right screw-downdevices 11. Also, proper control of the roll-bending forces F1' F2 is made possible by the roll-bending devices 5. - Thus, by adjusting the turning angle a°, initial roll gaps e1, e2 of the upper and lower work rolls 2, 2', and the roll-bending forces Fi, F2, the sectional contour across the workpiece 1 being rolled can be adjusted over a broad range of width.
- Since the pairs of upper and
lower rolls 2, and 2', 3' can cross at the point W, the roll crowning effects can be made equal on the left and right portions of the rolls. - With the four high mill of a paired-roll-crossing type according to the invention, built and designed to function in the manner described above, it is possible to control the sectional contour of the workpiece over a great range of width. Further, because rolling at either end portions is possible, the work rolls may be worn while generally maintaining the original cylindrical contours. This presents practical advantages of not only more than halved intervals of work roll changing and more than doubled total tonnage of rolling but also by far the lower cost of fabricating and regrinding the
rolls
Claims (2)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8181730074T DE3170718D1 (en) | 1981-08-17 | 1981-08-17 | Four high mill of paired-roll-crossing type |
EP19810730074 EP0072385B2 (en) | 1981-08-17 | 1981-08-17 | Four high mill of paired-roll-crossing type |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19810730074 EP0072385B2 (en) | 1981-08-17 | 1981-08-17 | Four high mill of paired-roll-crossing type |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0072385A1 EP0072385A1 (en) | 1983-02-23 |
EP0072385B1 true EP0072385B1 (en) | 1985-05-29 |
EP0072385B2 EP0072385B2 (en) | 1992-01-22 |
Family
ID=8188638
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19810730074 Expired EP0072385B2 (en) | 1981-08-17 | 1981-08-17 | Four high mill of paired-roll-crossing type |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0072385B2 (en) |
DE (1) | DE3170718D1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3811847A1 (en) * | 1987-04-08 | 1988-10-20 | Hitachi Ltd | Method for controlling the offset of the work rolls in a rolling stand |
DE4447382C2 (en) * | 1994-12-22 | 1999-08-12 | Mannesmann Ag | Roll stand for rolling sheets and strips |
CN104209330B (en) * | 2014-08-14 | 2016-05-11 | 湖州倍格曼新材料有限公司 | For the production of the shaped device of band |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE459138C (en) * | 1926-07-18 | 1928-04-26 | E H Rudolf Kronenberg Dr Ing | Rolling mill |
CH295443A (en) * | 1950-11-01 | 1953-12-31 | Carding Spec Canada | Device for distributing a pressure force exerted between the two rollers of a pair of pressure rollers. |
US2961901A (en) * | 1956-01-16 | 1960-11-29 | Francis J Klempay | Automatic control for adjusting rolling mills |
GB1054999A (en) * | 1964-11-16 | |||
US4212504A (en) * | 1979-02-26 | 1980-07-15 | Bakanov Anatoly I | Backing device for a working roll of a roll stand |
-
1981
- 1981-08-17 EP EP19810730074 patent/EP0072385B2/en not_active Expired
- 1981-08-17 DE DE8181730074T patent/DE3170718D1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0072385A1 (en) | 1983-02-23 |
DE3170718D1 (en) | 1985-07-04 |
EP0072385B2 (en) | 1992-01-22 |
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