GB2286549A - Tandem roughing and finishing line - Google Patents
Tandem roughing and finishing line Download PDFInfo
- Publication number
- GB2286549A GB2286549A GB9402208A GB9402208A GB2286549A GB 2286549 A GB2286549 A GB 2286549A GB 9402208 A GB9402208 A GB 9402208A GB 9402208 A GB9402208 A GB 9402208A GB 2286549 A GB2286549 A GB 2286549A
- Authority
- GB
- United Kingdom
- Prior art keywords
- roughing
- mill train
- slab
- finishing
- upstream
- 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.)
- Withdrawn
Links
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
- B21B1/24—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
- 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
- B21B1/34—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 hot-rolling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
In a tandem roughing and finishing line a steel slab is first rolled in a reversing roughing mill train 4, 5. During the roughing passes a roll gap of a finishing mill train 6, 7, 8, 9, 10 is opened up to accommodate the rough milled slab. The roll gap of the finishing mill train is only adjusted to do work on the rough milled slab when the slab is located upstream and can be finished by a single downstream pass through the finishing mill train. This arrangement allows the length of the tandem line to be kept to a minimum. A furnace coiler 3 may be provided upstream of the roughing mill train to avoid the need for a long upstream roller table to support the elongated slab. <IMAGE>
Description
Tandem Roughing and Finishing Line
In a conventional tandem roughing and finishing line the thickness of a slab is reduced by repeated passages in an upstream and downstream direction through a reversing roughing mill. The roughing mill may comprise one two or occasionally more stands and be associated with reversing edging mills. When the thickness of the slab has been adequately reduced the slab is passed through a finishing mill train downstream of the roughing mill. The finishing mill train is a continuous non-reversible train comprising between five and seven stands. Because the finishing mill train is continuous it is necessary to interpose a delay roller table between the roughing mill train and the finishing mill train to receive the rough thickness reduced slab downstream of the roughing mill.The delay roller table must be of a length sufficient to accommodate the elongated rough reduced slab.
Because of the reversing nature of the roughing mill it is also ordinarily necessary to provide a roller table upstream of the roughing mill to accommodate the rough reduced slab during an upstream roughing pass. These tables greatly increase the overall length of the line and consequently increase the cost of accommodation for the line and the capital equipment cost. One object of the present invention is to dispose of the requirement for the roller tables, thus alleviating the problems of accommodation exhibited by the prior art tandem roughing and finishing mill train.
According to the present invention there is provided a tandem roughing and finishing line comprising,
a roughing mill train; and
a finishing mill train downstream of the roughing mill train;
said finishing mill train being adapted so that the roll gap thereof can be opened up to accommodate a slab during rough milling.
According to another aspect of the present invention there is provided a method of operating a tandem roughing and finishing line having a reversing roughing mill train located upstream of a finishing mill train wherein the roll gap of the finishing mill train is set to accommodate the rough thickness reduced slab during a roughing pass.
From the above it will be appreciated that the key feature of the invention is to adapt the finishing mill train, which will ordinarily be a multi-stand finishing mill train, so that the roll gap of each finishing mill stand can be opened up to accommodate the rough milled slab during a roughing pass, without milling the slab and the gap of each finishing mill is only reduced to finish milling the slab when the rough milling has been completed. As a consequence of this the finishing mill train can be located immediately downstream of the roughing mill train and the rough milled slab can be supported on a roller table downstream of the finishing mill train during the rough milling steps. This of course provides the possibility of a substantial reduction in the length of the tandem roughing and finishing line and hence alleviates the problem exhibited by the prior art described above.
Another way of reducing the length of a tandem roughing and finishing mill such as the mill described according to the invention above is to provide a coiler upstream of the roughing mill train with means to divert the thickness reduced rough milled slab into the coil box as the slab is expelled from the roughing mill during an upstream
pass. The coiler may take the form of a stelecoil box or a steckle furnace coiler according to the required output.
During operation the slab is first delivered to the roughing mill along a downstream path which bypasses the coiler. The thickness of the slab is reduced by the roughing mill train and the slab may be accommodated in the downstream finishing mill train, as described above, as it is expelled from the roughing mill train in the downstream pass. After the first downstream pass the direction of the progress of the slab is reversed so that the slab is fed upstream to the reversing roughing mill train, the roll gaps of which are reset to produce a further thickness reduction during the upstream rough milling pass. The slab upstream of the roughing mill train, which has now been subjected to two roughing passes, is then coiled in the coiler. From this it will be realised that the region upstream of the reversing roughing mill only needs to accommodate the length of the unmilled slab.Thus, where the unmilled slab is delivered by a roller table the roller table upstream of the roughing mill need only be of sufficient length to accommodate the unmilled slab.
The roughing mill passes can be repeated indefinitely until the slab thickness is sufficiently reduced for the finishing mill pass. The milling stages must be arranged so that the rough milled slab is upstream of the roughing mill prior to the finishing pass and will be coiled on the coiler when provided.
For a further downstream pass the slab is uncoiled from the coiler to be fed to the roughing mill. Each roll gap of the roughing mill stands can be set to produce a first stage of the finishing pass. At this stage the roll gaps of the finishing mill train stands are set to provide the finishing milling stages for the slab so that as the slab passes from the coiler to the roughing mill and then to the finishing mill the finishing mill pass is implemented.
It will be appreciated the other equipment may be associated with the tandem roughing and finishing mill, such equipment may include apparatus such as a de-scaler, crop shear and a downstream coiler.
The construction and method of operation of a tandem roughing and finishing line constructed in accordance with the present invention will now be described, by way of example only,with reference to the accompanying drawing.
The drawing shows a tandem roughing and finishing line having a first furnace 1 and a second furnace 2 disposed one in parallel with the other. The furnaces are provided to heat the slabs to the temperature required for milling in the line.
Downstream of the furnaces is provided a roughing mill train comprising an upstream reversing roughing mill stand 4 and a downstream reversing roughing mill stand 5.
A finishing mill train is located immediately downstream of the roughing mill train and comprises five finishing mill stands 6, 7, 8, 9, 10, arranged in tandem.
Although not shown, means to receive a slab expelled downstream of the finishing mill train will be provided and will consist of either or both of, a roller table or a coiler.
A steckle furnace coiler 3 is disposed upstream of the roughing mill train and may be in parallel with an upstream roller table (not shown) which initially delivers the slab from one of the furnaces to the roughing mill train. Means (not shown) such as a roller table to convey a rough milled slab between the coiler and the roughing mill train will also be provided. A crop shear 11 may be deployed between the upstream roughing mill stand 4 and the steckle furnace coiler 3. A light vertical edger 12 is located upstream of the roughing mill train. In use, the gaps of the roughing mill stands 4, 5 are first set to produce a first rough thickness reduction of a slab. A heated slab is withdrawn from one of the furnaces 1, 2 and conveyed to the roughing mill train (see Figure 1) bypassing the steckle furnace to enter the roughing mill stands 4 and 5.In the roughing mill stands 4, 5 the slab is subject to a first downstream roughing pass.
The gaps of the finishing mill stands 6-10 are opened up so that the rough milled slab being expelled from the roughing mill train is accommodated in and passes through the finishing mill train without being milled. The partially rough milled slab expelled from the rouging mill train may be partially or wholly supported by the rolls of the finishing mill train, however, with the greatly increased length of the slab it will usually be necessary to accommodate the slab on a roller table downstream of the finishing mill or in a coiler.
At this stage the slab is stopped either by the action of braking the roller table or, by a pinch roller stand (not shown) downstream of the finishing mills or, conveniently, by operating at least one of the finishing mill stands 6 as a pinch roller stand as shown in Figure 2.
The roughing mill stands 5 and 4 are then reset for a second, upstream roughing pass and the finishing mill stand 6, acting as a pinch roller, is used to reverse the motion of the slab in the upstream direction to be fed back into the roughing stands 5 and 4 respectively for an upstream roughing pass as shown in Figure 2. As the slab is expelled from the upstream roughing mill 4 it is fed into the steckle furnace 3 where it is coiled for temporary storage.
The crop shear 11 is provided between the upstream roughing mill and the steckle furnace in order to crop any fishtail formed on the rough milled slab. If insufficient width reduction has been achieved by the upstream roughing pass the roughing mills may again be reset for a further downstream roughing pass.
The slab can be uncoiled from the steckle furnace, and fed through the roughing mill stands 4, 5 for a second downstream roughing pass.
Once the slab has been subject to a sufficient number of rough milling passes and is coiled in the coiler 3, the roll gaps of the roughing mill stands 4, 5 are set to provide a first stage of the finishing milling pass and the roll gaps of the finishing mill stands 6-10 are set to provide the later stages of the finishing mill pass. The slab is then uncoiled and fed downstream through the roughing mill train and finishing mill train in the final finishing pass. The strip produced is then coiled on the downstream coiler. Additional upstream and downstream roughing passes may be employed where further reduction or more gradual reduction is required.
Claims (10)
1. A tandem roughing and finishing line comprising,
a roughing mill train; and
a finishing mill train downstream of the roughing mill train;
said finishing mill train being adapted so that the roll gap thereof can be opened up to accommodate a slab during rough milling.
2. A line according to claim 1 wherein the finishing mill train is a multi stand finishing mill train.
3. A line according to claim 1 or claim 2 wherein the finishing mill train is located immediately downstream of the roughing mill train.
4. A line according to any one of the preceding claims wherein a roller table is located downstream of the finishing mill train to support the slab during the rough milling steps.
5. A line according to any one of the preceding claims wherein a coiler is provided upstream of the roughing mill train, means to deliver the slab to the roughing mill in the downstream direction for the first roughing pass and means to divert the rough milled slab into the coiler during an upstream pass.
6. A line according to claim 5 wherein the coiler is a
stelco,Jcoil box.
7. A line according to claim 5 wherein the coiler is a steckle furnace coiler.
8. A method of operating a tandem roughing and finishing line having a reversing roughing mill train located upstream of a finishing mill train wherein the roll gap of the finishing mill train is set to accommodate the rough thickness reduced slab during a roughing pass.
9. A method according to claim 8 wherein the slab is supported on a roller table located immediately downstream of the finishing mill train during a downstream roughing pass.
10. A method according to claim 9 wherein the slab is stored temporarily on a coiler located upstream of the roughing mill train during an upstream roughing pass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9402208A GB2286549A (en) | 1994-02-04 | 1994-02-04 | Tandem roughing and finishing line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9402208A GB2286549A (en) | 1994-02-04 | 1994-02-04 | Tandem roughing and finishing line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9402208D0 GB9402208D0 (en) | 1994-03-30 |
| GB2286549A true GB2286549A (en) | 1995-08-23 |
Family
ID=10749911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9402208A Withdrawn GB2286549A (en) | 1994-02-04 | 1994-02-04 | Tandem roughing and finishing line |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2286549A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2134022A (en) * | 1983-01-25 | 1984-08-08 | Tippins Mach | A method of hot rolling metal slab to strip thickness and a close coupled hot strip mill therefor |
-
1994
- 1994-02-04 GB GB9402208A patent/GB2286549A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2134022A (en) * | 1983-01-25 | 1984-08-08 | Tippins Mach | A method of hot rolling metal slab to strip thickness and a close coupled hot strip mill therefor |
| US4503697A (en) * | 1983-01-25 | 1985-03-12 | Tippins Machinery Company, Inc. | Method for hot rolling slabs |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9402208D0 (en) | 1994-03-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |