EP0091156B1 - Apparatus for reducing the width of a steel slab by rolling - Google Patents
Apparatus for reducing the width of a steel slab by rolling Download PDFInfo
- Publication number
- EP0091156B1 EP0091156B1 EP83200418A EP83200418A EP0091156B1 EP 0091156 B1 EP0091156 B1 EP 0091156B1 EP 83200418 A EP83200418 A EP 83200418A EP 83200418 A EP83200418 A EP 83200418A EP 0091156 B1 EP0091156 B1 EP 0091156B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling
- edge
- slab
- elements
- rolling elements
- 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
- 238000005096 rolling process Methods 0.000 title claims abstract description 140
- 229910000831 Steel Inorganic materials 0.000 title claims description 8
- 239000010959 steel Substances 0.000 title claims description 8
- 230000009467 reduction Effects 0.000 description 8
- 238000007688 edging Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000001788 irregular Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/026—Rolling
-
- 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
- B21B13/06—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged vertically, e.g. edgers
-
- 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
- B21B13/18—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for step-by-step or planetary rolling; pendulum mills
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
Description
- The invention relates to an apparatus for reducing the width of a steel slab by rolling, comprising edge-rolling elements, the rolling surfaces of which are moved in a rolling manner on the edges of the steel slab.
- An apparatus of this type is known for example from US 3,757,556.
- Reducing the width of a steel slab by rolling (hereinafter called width rolling) is an important development in the field of the hot strip rolling of steel. By this technique the production of a continuous casting plant is increased and a hot connection with a hot strip rolling mill is possible. This and other advantages of width rolling are known to the expert and do not need further explanation. Sometimes width rolling is carried out directly after the continuous casting of the slab. In most cases however, it is best to carry out width rolling in the hot strip rolling mill.
- The known width rolling is carried out with edge rolls. In a conventional hot strip rolling mill, the diameter of the edge rolls is up to approximately 800 mm. Only a small reduction in width, by a maximum of 40-60 mm can be obtained with these edge rolls. With a greater width reduction one experiences problems when feeding the slab into the edge rolls. For this reason, larger diameter edge rolls have been adopted, going up to 1200 mm diameter as shown in US 3,757 556. With a diameter of 1200 mm, the maximum width reduction per pass is 150 mm; at this width there is substantial dog-bone formation as will now be discussed.
- One problem with width rolling is the irregular deformation of the piece being rolled. Firstly the material is not spread evenly over the width during width rolling; but ends up thicker at the edges. In a cross-section at right angles to the direction of rolling, the piece being rolled exhibits a so-called dog-bone shape after rolling. This effect can be minimized by using the caliber rolls known from US 3,757,556, but even then the maximum width reduction is limited by the formation of a dog-bone to the maximum of 100 mm per pass, after which the resulting dog-bone can largely be rolled flat during the following thickness rolling pass. Also during thickness rolling, part of the width reduction obtained by width rolling is lost as a result of expansion of the piece being rolled. Secondly, the material is not distributed evenly in the longitudinal direction during width rolling. The elongation of the slab is not uniform in the middle and at the sides, as a result of which the original square ends of the head and tail of the slab exhibit a so-called fish-tail shape after width rolling. This effect is further amplified by thickness rolling, after width rolling, in which, during rolling flat of the dog-bone shape, irregular elongation of the slab also occurs. This deformation results in a loss of material as the deformed ends have to be cut off before final rolling in the hot strip rolling mill. As a result of this the slab output is smaller for width rolling.
- These problems are discussed in Japanese Laid Open Patent Application 56-11451. The applicants in that application suggest the use of very large diameter edge rolls, so that the deformation caused by the rolling would extend right in to the middle of the slab. They propose rolls of at least 1.5 m in diameter. They find that, after the dog-bone has been rolled flat, the amount of material wasted by the fish-tails is substantially reduced.
- We have found, in general agreement with JP 56-11451, that it is advantageous if the radius of curvature of the rolling surface of edge-rolling elements is at least 0.6 m. However, if the edge-rolling elements are circular-section cylindrical rolls, there are technical and economic drawbacks, especially if the rolls are very large, e.g. 5 m radius. One drawback is simply the space which they take up.
- We have realised that it is not necessary for the rolling elements to be circular-section rolls. The contact surface between the slab and the rolling element is only a portion of the full circumference of the roll, and a rolling element need only provide an appropriately curved surface in the zone of rolling contact.
- Accordingly, the present invention provides apparatus for reducing the width of the steel slab by rolling having a pair of opposed edge rolling elements which each provide, at the zone of rolling contact with the slab, a curved surface which is a sector of angular length less than 180°. In this way, we can avoid the use of large rolls, while retaining the benefit of reduced deformation and greater output.
- The roll elements no longer need to be able to rotate through 360°. After a pass corresponding to the arc length of the sector the roll elements can be returned to roll the next slab or the next section of the slab. Preferably the angular length of the curved surface is no more than 90°.
- For edge-rolling elements with a greater diameter, it is preferable for there not to be a physical centre of rotation, as in full-circle cylindrical edging rolls, but for the edge-rolling elements to be designed such that measured in a direction at right angles to the rolling surface they are of a thickness which is smaller than the radius of curvature of the rolling surface. The rolling movement of the edge-rolling elements and the sides of the slab is here produced by an appropriate movement mechanism of the edge-rolling elements and/or slab.
- In one embodiment of the movement mechanism the geometric centre of the rolling surface of the edge-rolling elements can be moved in a direction parallel to and opposite to the direction of rolling.
- Advantageously the apparatus also includes a number of back-up rolls, which form a path for the edge-rolling elements and which, during rolling, cooperate to support the side of the edge-rolling elements facing away from the slab.
- The edge-rolling elements are preferably designed with grooves, like caliber rolls, where the bottom of the groove forms the roll surface. By use of this design, dog-bone deformation can be kept to an especially small degree.
- The edge-rolling elements may also be flexible in the direction of rolling and during rolling have a curve dependent on the track formed by the back-up rolls. Here the edge-rolling elements are preferably made in the form of caterpillar or apron conveyors, which are closed to themselves.
- Embodiments of the invention, given by way of example, will now be described with reference to the accompanying drawings, in which:
- Figures 1A and B show conventional width rolling.
- Figures 2A and B show width rolling with large radius contact surfaces.
- Figures 3, 4 and 5 show three embodiments of the present invention.
- Figure 6 shows a section through the embodiment of Figure 3 along the line VI-VI.
- Figure 1A shows a
slab 1 andedge rolls 2, which with theirrolling surfaces 3 roll theedges 4 of the slab, while the slab is moved in the rolling direction shown byarrow 5. During this rolling the edge rolls exert a force on the slab at right angles to the direction of rolling 5, and as a result of this the width of the slab is reduced. A slab may for example be 1800 mm wide and 225 mm thick initially. The length of the slab may be more than 10 m. In the reduction of the width, the material of the slab is plastically deformed. During the reduction of the width of the slab, by width rolling, e.g. by 100 mm, the head end of the slab is elongated irregularly into a fish-tail 6. The cross-section of the rolled slab B-B in Figure 1A, is shown in Figure 1 B. This shows that irregular thickening, a so-called dog-bone 7 is formed. - Figure 2A shows width rolling with large radius edge-
rolling elements 8 having a substantially greater radius of curvature than conventional edging rolls. The head 9 ofslab 1, after width rolling, has a fairly straight end at right angles to the direction of rolling 5. The cross-section of the rolled slab, B-B in Figure 2A, is shown in Figure 2B. This shows that very little irregular thickening occurs in this case. - The irregular deformation of the length and thickness of the slab during width rolling is smaller the greater the radius of curvature of the edge-rolling elements. A radius of curvature which is only slightly greater than the conventional maximum radius of curvature of 0.6 m of known edging rolls gives an advantage. In the following embodiments will be discussed where the radius of curvature of the edge-rolling elements is much greater than for the known edging rolls.
- Edge-rolling elements with a much greater radius of curvature, when they take the form of full circle cylindrical edging rolls, have technical and economic drawbacks such as a large space requirement, the need for a heavy foundation and the need for high driving power. For such edge-rolling elements it is possible, and sufficient for practical purposes to provide sector of angle a which is less than 360°; the length of the
contact roll surface 3 being chosen in dependence on the length ofslab 1 which is to be edge-rolled. - The rolling movement of the edge-rolling elements is obtained by rotation in the direction of the
arrows 11 about the centres ofcurvature 10. The edge-rolling elements do not need to be further rotated to complete 360° to roll a following slab, but can be returned to their starting positions by reverse rotation after each rolling action. - The rolling movement can also be obtained by moving
centres 10 indirection 12, parallel and opposite to therolling direction 5. - For edge-rolling elements which have a very large radius of curvature and which are in the form of a sector of a complete circular edging roll and physically include the centre of
curvature 10, the technical and economic drawbacks stated above still apply to some extent. Figure 3 shows an embodiment where the edge-rollingelements 8 are so designed that they do not extend in the direction at right angles to the rollingsurface 3 for the entire radius of curvature of the rolling surface. - The edge-rolling
elements 8 are arcuate in shape and each have aswivelling point 13 at each end. By means of a movement mechanism not shown, which is linked with swivellingpoints 13, the edge-rollingelements 8 are moved so as to roll theedges 4 of the slab with the two rollingsurfaces 3. - The length of the rolling surface of the edge-rolling elements can be selected such that with these edge-rolling elements a slab of maximum envisaged length can be rolled in one pass. The length selected can also be smaller, as shown in Figure 3, and the slab rolled in a number of passes with the edge-rolling elements.
- Figure 4 shows another embodiment of the apparatus with edge-rolling elements of a thickness of less than the radius of curvature of the rolling surface. Here the edge-rolling
elements 8 are supported, guided and possibly driven by a number of back-up rolls 14, which form a track for the edge-rollingelements 8. With this embodiment the edge-rolling elements can be flexible in therolling direction 5, with the curvature of the rolling surfaces during width rolling being dependent on the path formed by the back-up rolls 14. - Figure 5 shows an embodiment in which the edge-rolling elements are flexible and form caterpillar or
apron conveyors 15, which are closed loops. - As shown in Figure 6, the edge-rolling
elements 8 can have acaliber groove 16. This reduces the formation of a dog-bone inslab 1 still further. The bottom of thegroove 16 forms the rollingsurface 3 mentioned above. - With an apparatus in accordance with Fig. 2 a test was carried out in which the width of the slab was substantially reduced. Plasticine was used as the slab material. The expert knows that at room temperature plasticine behaves similarly to steel during hot rolling.
- The test was carried out on a scale reduced by 10. The dimensions of the plasticine slab were 180 x 22.5 x 600 mm. The radius of curvature of the roll elements was 1000 mm.
- The width reduction was 15 mm.
- After one pass the deformation of the head and tail was measured. In addition the rolled plasticine slab was carefully cut at right angles to the direction of rolling and the dog-bone measured. It was found that little or no dog-bone or fish-tail was formed.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT83200418T ATE14685T1 (en) | 1982-04-07 | 1983-03-25 | DEVICE FOR REDUCING THE WIDTH OF A STEEL SLAT BY ROLLING. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8201499A NL8201499A (en) | 1982-04-07 | 1982-04-07 | Apparatus for significantly reducing the width of a steel slab by rolling. |
NL8201499 | 1982-04-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0091156A1 EP0091156A1 (en) | 1983-10-12 |
EP0091156B1 true EP0091156B1 (en) | 1985-08-07 |
Family
ID=19839558
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83200418A Expired EP0091156B1 (en) | 1982-04-07 | 1983-03-25 | Apparatus for reducing the width of a steel slab by rolling |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0091156B1 (en) |
JP (1) | JPS58187202A (en) |
AT (1) | ATE14685T1 (en) |
DE (1) | DE3360508D1 (en) |
NL (1) | NL8201499A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2639594B2 (en) * | 1989-12-23 | 1997-08-13 | 株式会社河合楽器製作所 | Electronics |
JPH03200286A (en) * | 1989-12-28 | 1991-09-02 | Kawai Musical Instr Mfg Co Ltd | Operation device for electronic equipment |
NL9301269A (en) * | 1993-07-20 | 1995-02-16 | Hoogovens Groep Bv | Apparatus for effecting a major reduction of the width of a metal billet by edging |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3422656A (en) * | 1966-03-18 | 1969-01-21 | United States Steel Corp | Method of rolling slabs in planetary mill |
JPS5942561B2 (en) * | 1980-02-13 | 1984-10-16 | 新日本製鐵株式会社 | Hot rolling method |
-
1982
- 1982-04-07 NL NL8201499A patent/NL8201499A/en not_active Application Discontinuation
-
1983
- 1983-03-25 DE DE8383200418T patent/DE3360508D1/en not_active Expired
- 1983-03-25 AT AT83200418T patent/ATE14685T1/en not_active IP Right Cessation
- 1983-03-25 EP EP83200418A patent/EP0091156B1/en not_active Expired
- 1983-04-06 JP JP58059380A patent/JPS58187202A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
ATE14685T1 (en) | 1985-08-15 |
JPS58187202A (en) | 1983-11-01 |
DE3360508D1 (en) | 1985-09-12 |
EP0091156A1 (en) | 1983-10-12 |
NL8201499A (en) | 1983-11-01 |
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