GB2197233A - Rolling of metal strip - Google Patents
Rolling of metal strip Download PDFInfo
- Publication number
- GB2197233A GB2197233A GB08722859A GB8722859A GB2197233A GB 2197233 A GB2197233 A GB 2197233A GB 08722859 A GB08722859 A GB 08722859A GB 8722859 A GB8722859 A GB 8722859A GB 2197233 A GB2197233 A GB 2197233A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rolling
- metal strip
- cold rolling
- stretch
- strip
- 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.)
- Granted
Links
- 239000002184 metal Substances 0.000 title claims abstract description 27
- 238000005096 rolling process Methods 0.000 title claims abstract description 27
- 238000005097 cold rolling Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000005452 bending Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000000137 annealing Methods 0.000 claims description 6
- 238000005246 galvanizing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 230000035882 stress Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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
- B21B1/22—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
- B21B1/30—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 non-continuous process
- B21B1/32—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
- B21B1/36—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by cold-rolling
-
- 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
-
- 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
- B21B2001/228—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 skin pass rolling or temper rolling
-
- 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
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/08—Braking or tensioning arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
A process for the production of metal strip includes at least one cold rolling operation, in which the metal strip is stretch-bend straightened before the cold rolling operation or before the first cold rolling operation, whereby the so-called "pinching effect" is eliminated. A rolling mill for carrying out the process has a four-high roll stand 1, a stretch-bending roll stand 2 preceding it, a pay-out reel 3 and a coiling reel 4 for the metal strip 5, the four-high roll stand being designed as a cold rolling stand, and the stretch-bend rolls 6 having a diameter 30 to 40 times the thickness of the metal strip 5 prior to the cold rolling operation. <IMAGE>
Description
SPECIFICATION
Rolling of metal strip
This invention relates to a process for the production of metal strip by a rolling process in which the metal strip is stretch-bend straightened prior to a rolling operation.
During both reduction and finish rolling, difficulties arise when the incoming strip is wavy.
The wavy zones in the strip cause squeeze markings which damage both the strip and the rolls. When the waviness is excessive, the waves are held up in front of the roll gap until they fold over and are doubled. When the rolls are large in diameter and grip the stock over a sufficient angle, as in two-high stands for example, the doublings are rolled over, thereby making the rolls and the strip itself unusable. When the rolls are small in diameter, as in four-high or clustered roll stands for example, the holdup leads to strip tearing or roll breakage. In order to avoid this socalled "pinching effect", the strip is rolled with sufficient tension to produce plastic extension in the strip before it reaches the narrowest roll gap.The displacement of the flow threshold produces a greater extension in the shorter strip lengths than in the wavy and therefore longer strip lengths, so that the waviness is removed and the pinching effect is suppressed. These extremely high strip tensions necessitate additional means, such as tensioning stands preceding the rolling stand for example, which must be additionally included in the mill driving system. Furthermore, excessive strip tensions lead to a more rapid ageing of the strip material.
On the other hand, it is desirable to carry out the rolling operation in finishing mills, for example finishing stands, at the lowest possible strip tensions, in order to obtain specified material properties, associated for example with a certain grain structure in the surface layers. Practical experience indicates that rolling at low tensions provides a clear improvement in respect of the so-called antifluting behaviour of steels. It is still far from clear to what extent this improvement is brought about by different residual stresses, dislocation effects, different dislocation densities or other mechanisms.
Since waviness is inevitably developed during strip production, these difficulties with the known rolling processes become particularly acute during finish rolling.
In a completely different field, viz., during the production of thin metal strip from hot strip in a hot rolling process, it is known to stretch-bend straighten the hot strip before coiling, the stretch-bend straightening operation being carried out prior to the last hot rolling pass. This procedure is intended to produce thin metal strip having the same mechanical, metallurgical and geometrical quality parameters as cold rolled metal strip, by rational and economical means in a continuous hot rolling process, with particular reference to the avoidance of pronounced rolling textures.
These known procedures have not materially influenced the problem initially discussed, which arises during the cold rolling of metal strips.
The object of the invention is to provide a process of the type initially described, for the production of metal strip, in which the "pinching effect" can be eliminated during cold rolling at extremely low strip tensions.
According to the present invention there is provided a process for the production of metal strip including at least one cold rolling operation, in which the metal strip is stretchbend straightened before the cold rolling operation or before the first cold rolling operation.
The invention arises from the discovery that during stretch-bend straightening undertension the metal strip to be cold rolled is bent alternately in opposite directions round a plurality of stretch-bend rolls, so that tensile and bending stresses are superimposed on each stretch-bending roll. The stresses required for stretching are set up not merely by the strip tension but also to a greater extent by the superimposed bending. The advantages of stretch-bend straightening include not only a relatively low strip tension level but also the superior flatness attained in the metal strip, even when the strip cross-section is large, so that waviness is simultaneously removed.
After stretch-bend straightening, the metal strip is subjected to the cold rolling process after its fibre lengths have been equalised.
This eliminates the "pinching effect". Damage to the metal strip and the rolls is avoided, while the required rolling effect is maintained.
Further advantages include the possibility of regulating the yield limit behaviour, strain capacity and ageing of the metal strip. The process of the invention is particularly advantageously adapted to use in treatment lines such as annealing, galvanising and like processing lines in which the metal strip for treatment is finished rolled within the line. In such treatment lines, the cold rolled metal strip is soft annealed in annealing furnaces, and renewed waviness can developed by the relief of variable residual stresses in the strip plane, but it is now eliminated.
A further object of the invention is a rolling mill which is particularly adapted to carrying out the process as claimed, and features at least one rolling stand and one stretch-bending stand preceding the rolling stand or the first rolling stand, which rolling stand is designed as a cold rolling stand, for example a two-high, four-high or clustered roll stand. In this case, the diameter of the stretch-bend rolls can be 30 to 40 times the thickness of the strip prior to the cold rolling operation or the first cold rolling operation.
Two embodiments of the invention will now be described purely by way of example with reference to the accompanying diagrammatic drawings in which: Figure 1 shows a cold rolling mill having a four-high roll stand, for carrying out the process according to the invention; and
Figure 2 shows a cold rolling mill having a two-high roll stand, for carrying out the process according to the invention in an annealing line.
Fig. 1 shows a rolling mill having a four-high roll stand 1, a stretch-bending roll stand 2 preceding the roll stand 1, a pay-out reel 3 and a coiling reel 4 for the metal strip 5. The four-high roll stand 1 is designed as a cold rolling stand. The diameter of the stretch-bend rolls 6 in the preceding stretch-bending roll stand 2 is 30 to 40 times the thickness of the strip prior to the cold rolling operation.
Fig. 2 shows an annealing line having an annealing furnace 7, a following cooling zone 8 and a strip magazine 9 with loop trolleys (only one being shown). Between the cooling zone 8 and the strip magazine 9 there is provided a two-high roll stand 1 preceded by a stretch-bending roll stand 2. Braking rolls 10 additionally precede the stretch-bending roll stand 2. The two-high roll stand 1 is designed as a cold rolling stand.
In the two emgodiments, stretch-bend straightening in a cold rolling process is carried out before the cold rolling operation, so that when the metal strip 5 in question is cold rolled the 'pinching effect" is eliminated when applying extremely low strip tensions. The low strip tensions result in a regulated and/or extremely retarded ageing of the strip material.
Claims (6)
1. A process for the production of metal strip including at least one cold rolling operation. in which the metal strip is stretch-bend straightened before the cold rolling operation or before the first cold rolling operation.
2. A process as in Claim 1, wherein the stretch-bend straightening is carried out before the finish rolling of the metal strip in a treatment line, such for example as an annealing, galvanising or like processing line.
3. A rolling mill for carrying out the process as In Claim 1 or Claim 2, having at least one rolling stand and one stretch-bending stand preceding the rolling stand, the rolling stand being designed as a cold rolling stand, for example a two-high, four-high or clustered roll stand.
4. A rolling mill as in Claim 3, wherein the diameter of the stretch-bend rolls is 30 to 40 times the thickness of the strip prior to the cold rolling operation or the first cold rolling operation.
5. A rolling mill for carrying out the process as in Claim 1, substantially as hereinbefore described with reference to Fig. 1 of the accompanying drawings.
6. A rolling mill for carrying out the process as in Claim 2, substantially as hereinbefore described with reference to Fig. 2 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863635088 DE3635088A1 (en) | 1986-10-15 | 1986-10-15 | METHOD AND ROLLING MILL FOR PRODUCING METAL STRIP IN A ROLLING PROCESS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8722859D0 GB8722859D0 (en) | 1987-11-04 |
| GB2197233A true GB2197233A (en) | 1988-05-18 |
| GB2197233B GB2197233B (en) | 1990-06-13 |
Family
ID=6311774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8722859A Expired - Fee Related GB2197233B (en) | 1986-10-15 | 1987-09-29 | Rolling of metal strip |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS63104704A (en) |
| DE (1) | DE3635088A1 (en) |
| FR (1) | FR2605254A1 (en) |
| GB (1) | GB2197233B (en) |
| IT (1) | IT1222580B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0436762A1 (en) * | 1990-01-12 | 1991-07-17 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Method and apparatus for achieving a predetermined yield point and surface roughness during cold-laminating of metallic pre-treated strips |
| EP0498038A2 (en) * | 1991-02-08 | 1992-08-12 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Straightening plant for finite strips, in particular for metal strips |
| GB2309185A (en) * | 1996-01-16 | 1997-07-23 | Draftex Ind Ltd | Stress relief of metal strip |
| US7093355B2 (en) | 2001-09-25 | 2006-08-22 | Karl Fuhr Gmbh & Co. Kg Maschinenfabrik | Method and device for producing flat metal ribbon cables |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101322976B (en) * | 2008-06-30 | 2010-06-02 | 常熟市双华电子有限公司 | 4-roller cold rolling mill |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB463939A (en) * | 1936-08-17 | 1937-04-08 | American Rolling Mill Co | Improvements in or relating to the rolling of metal strip |
| GB485443A (en) * | 1937-09-08 | 1938-05-19 | American Rolling Mill Co | Improvements in process and mechanism for rolling endless lengths of metal in reversible mills |
| GB1519857A (en) * | 1974-09-04 | 1978-08-02 | Blaw Knox Foundry Mill Machine | Tandem rolling mill |
| EP0195385A2 (en) * | 1985-03-15 | 1986-09-24 | Nippon Steel Corporation | Method and apparatus for manufacturing cold-rolled steel strip |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2105736A (en) * | 1934-08-23 | 1938-01-18 | American Relling Mill Company | Process and mechanism for rolling endless lengths of metal in reversible mills |
| US2214618A (en) * | 1937-08-28 | 1940-09-10 | Westinghouse Electric & Mfg Co | Continuously operating strip mill |
| US3192752A (en) * | 1963-06-27 | 1965-07-06 | Aluminum Co Of America | Cold rolling aluminum and product |
| US3344637A (en) * | 1965-02-01 | 1967-10-03 | Natalis H Polakowski | Strip rolling mill system and process |
| AT314453B (en) * | 1971-07-09 | 1974-04-10 | Bwg Bergwerk Und Walzwek Masch | Method and device for reducing sheet metal strips in strip lines |
| 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 |
| JPS54127858A (en) * | 1978-03-27 | 1979-10-04 | Sumitomo Metal Ind Ltd | Controlling tight pressure of entering guide in tandem mill |
| JPS5945443B2 (en) * | 1980-10-09 | 1984-11-06 | 日本鋼管株式会社 | Cold rolling method in continuous process line |
| JPS57202904A (en) * | 1981-06-09 | 1982-12-13 | Kawasaki Steel Corp | Setting method for shape in skin pass mill |
-
1986
- 1986-10-15 DE DE19863635088 patent/DE3635088A1/en not_active Ceased
-
1987
- 1987-07-22 JP JP62181308A patent/JPS63104704A/en active Pending
- 1987-08-05 FR FR8711138A patent/FR2605254A1/en active Pending
- 1987-09-02 IT IT21776/87A patent/IT1222580B/en active
- 1987-09-29 GB GB8722859A patent/GB2197233B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB463939A (en) * | 1936-08-17 | 1937-04-08 | American Rolling Mill Co | Improvements in or relating to the rolling of metal strip |
| GB485443A (en) * | 1937-09-08 | 1938-05-19 | American Rolling Mill Co | Improvements in process and mechanism for rolling endless lengths of metal in reversible mills |
| GB1519857A (en) * | 1974-09-04 | 1978-08-02 | Blaw Knox Foundry Mill Machine | Tandem rolling mill |
| EP0195385A2 (en) * | 1985-03-15 | 1986-09-24 | Nippon Steel Corporation | Method and apparatus for manufacturing cold-rolled steel strip |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0436762A1 (en) * | 1990-01-12 | 1991-07-17 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Method and apparatus for achieving a predetermined yield point and surface roughness during cold-laminating of metallic pre-treated strips |
| EP0498038A2 (en) * | 1991-02-08 | 1992-08-12 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Straightening plant for finite strips, in particular for metal strips |
| EP0498038A3 (en) * | 1991-02-08 | 1992-09-23 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Straightening plant for finite strips, in particular for metal strips |
| GB2309185A (en) * | 1996-01-16 | 1997-07-23 | Draftex Ind Ltd | Stress relief of metal strip |
| US7093355B2 (en) | 2001-09-25 | 2006-08-22 | Karl Fuhr Gmbh & Co. Kg Maschinenfabrik | Method and device for producing flat metal ribbon cables |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2605254A1 (en) | 1988-04-22 |
| IT1222580B (en) | 1990-09-05 |
| GB2197233B (en) | 1990-06-13 |
| DE3635088A1 (en) | 1988-04-28 |
| GB8722859D0 (en) | 1987-11-04 |
| IT8721776A0 (en) | 1987-09-02 |
| JPS63104704A (en) | 1988-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920929 |