CA2375117A1 - Method and rolling installation for the austenitic rolling of thin strips - Google Patents
Method and rolling installation for the austenitic rolling of thin strips Download PDFInfo
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- CA2375117A1 CA2375117A1 CA002375117A CA2375117A CA2375117A1 CA 2375117 A1 CA2375117 A1 CA 2375117A1 CA 002375117 A CA002375117 A CA 002375117A CA 2375117 A CA2375117 A CA 2375117A CA 2375117 A1 CA2375117 A1 CA 2375117A1
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- coiler
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- 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
- B21B2015/0057—Coiling the rolled product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/02—Austenitic rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/06—Product speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/08—Coiler speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A disadvantage in the production of thin strips by austenitic rolling in the hot strip trains is that very thin strips are delivered at high speeds (vW), which can cause difficulties for the successive processing steps. According to the invention, the strip is wound onto a rotor winder (8) as wound strip (11 ) immediately after exiting the last rolling stand of the rolling train (5) wi th a high delivery speed (vW). Said strip is then unwound at a low transportati on speed (vT) as unwound strip (12).
Description
Method and Rolling Installation for the Austenitic Rolling of Thin Strips The invention relates to a method for austenitic rolling of thin strips in hot rolling mills, preferably in CSP hot rolling mills, comprised of a multi-stand rolling mill, a runout roller table with devices for cooling the rolled strip, and coilers arranged downstream for coiling the strip.
Hot rolling mills for producing strips are nowadays usually configured and operated such that the deformation in the individual rolling stands is carried out under austenitic conditions.
Accordingly, it is ensured that the rolling temperature in the individual roll stands is above the GOS line of the steel carbon diagram. Only after the last rolling pass, cooling to the coiling temperature is carried out in the cooling stretch resulting in micro-structure conversion.
Depending on the level of the carbon contents of the strips, the final rolling temperature is approximately 890 to 930 °C in the above described method. Maintaining the final rolling temperature is controlled by changing the final rolling speed which has an effect on the natural cooling and on the heat supply by means of the rolling process.
This can be applied without problems for strip thicknesses above a minimum strip thickness which, depending on the rolling mill type, is within the magnitude of 1.3 mm. When dropping below this strip thickness, the required rolling speed reaches values of more than 12 m/s which in the free runout on the runout roller table downstream of the rolling mill can no longer be controlled because the hot strip on the runout roller table at this high speed can no longer be guided properly and, moreover, also cannot be subsequently coiled.
Moreover, there is a thermal problem in that the rolling process is characterized by non-constant strip temperatures (deviations across the strip width and strip thickness, greater cooling of the pre-strip end in comparison to the pre-strip head during rolling in the finishing train).
Development tendencies are directed toward producing also strip thicknesses below 1.3 mm. In this connection, it is attempted inter alia to lower the final rolling temperature in order to reach in this way controllable final rolling speeds.
In DE 195 38 341 Al a production device for manufacturing thin strips up to 1 mm thickness is described wherein first an austenitic rolling to 5 to 15 mm is carried out and, subsequently, a ferritic rolling to a strip thickness of approximately 1 mm is carried out at a temperature above 850 °C. For this purpose, the first stand of the rolling mill is firstly configured as a reversing stand which has arranged upstream and downstream thereof at least one coiling furnace, respectively, wherein a controllable cooling device is provided between the upstream coiling furnace and the successive reserving stand.
Hot rolling mills for producing strips are nowadays usually configured and operated such that the deformation in the individual rolling stands is carried out under austenitic conditions.
Accordingly, it is ensured that the rolling temperature in the individual roll stands is above the GOS line of the steel carbon diagram. Only after the last rolling pass, cooling to the coiling temperature is carried out in the cooling stretch resulting in micro-structure conversion.
Depending on the level of the carbon contents of the strips, the final rolling temperature is approximately 890 to 930 °C in the above described method. Maintaining the final rolling temperature is controlled by changing the final rolling speed which has an effect on the natural cooling and on the heat supply by means of the rolling process.
This can be applied without problems for strip thicknesses above a minimum strip thickness which, depending on the rolling mill type, is within the magnitude of 1.3 mm. When dropping below this strip thickness, the required rolling speed reaches values of more than 12 m/s which in the free runout on the runout roller table downstream of the rolling mill can no longer be controlled because the hot strip on the runout roller table at this high speed can no longer be guided properly and, moreover, also cannot be subsequently coiled.
Moreover, there is a thermal problem in that the rolling process is characterized by non-constant strip temperatures (deviations across the strip width and strip thickness, greater cooling of the pre-strip end in comparison to the pre-strip head during rolling in the finishing train).
Development tendencies are directed toward producing also strip thicknesses below 1.3 mm. In this connection, it is attempted inter alia to lower the final rolling temperature in order to reach in this way controllable final rolling speeds.
In DE 195 38 341 Al a production device for manufacturing thin strips up to 1 mm thickness is described wherein first an austenitic rolling to 5 to 15 mm is carried out and, subsequently, a ferritic rolling to a strip thickness of approximately 1 mm is carried out at a temperature above 850 °C. For this purpose, the first stand of the rolling mill is firstly configured as a reversing stand which has arranged upstream and downstream thereof at least one coiling furnace, respectively, wherein a controllable cooling device is provided between the upstream coiling furnace and the successive reserving stand.
In the patent application (EP 97 120 406.0) it is suggested for the purpose of equilibrating the strip temperature - so that hot strip having thicknesses under 1 mm can be rolled - to arrange between the reserving stand and the hot strip finishing train a compensation furnace which ensures, by means of a number of receiving spaces for strips capable of being heated for compensation, a total heating time for each pre-strip with pre-strip thickness which is a multiple of the rolling time in the hot strip finishing train. This produces a pre-strip with a homogenous temperature wherein the best possible preconditions for the rolling of strips with minimal final strip thicknesses can be provided.
In an article ("Around-up of CSP thin slab", Steel Times-incorporation Iron and Steel, GB, Fuel and Metallurgical journals Ltd., London, Vol. 226, No. 5, 1 May 1998, pages 175, 176, 178) the layout of a CSP hot rolling mill is described which is comprised of two casting lines, a mufti-stand rolling mill and a cooling stretch. The rolling mill has arranged downstream thereof a coiler with two horizontal mandrels located on a vertical turntable. The mandrel oriented toward the rolling mill is provided for coiling the strip exiting the rolling mill. After initial coiling, the two mandrels are pivoted by 180° . While the strip is finish-coiled onto the mandrel facing the rolling mill to a coil, a free mandrel is available for initial coiling of the successive strip - without any loss of time.
In order to be able to roll on CSP hot rolling mills thin strips under austenitic conditions, extremely high runout speeds (up to approximately 20 m/s) are required. A safe transport of the rolled strip on the runout roller table is, however, possible only at maximally 12 m/s and up to a point where the strip end exiting the last rolling stand is engaged by the underfloor toiler and is then coiled. Only thereafter the rolling mill can be accelerated to higher runout speeds. For such a rolling strategy, different rolling conditions and the great spacing between the last roll stand and the underfloor toiler have the result that the rolled leading end of the strip does not have the desired mechanical material properties. They are reached only when already approximately 130 m have been rolled so that the output of the mill is thus reduced.
Based on this prior art, it is an object of the invention to provide a method which can control the higher final rolling speed or runout speed resulting in the production of thin strips below 1.2 mm with simple means such that for known methods and rolling mills the resulting disadvantages, such as, for example, an unfavorable removal or a high apparatus expenditure, in combination with additional operating costs, can be substantially prevented by additional heating or cooling.
This object is solved by a hot rolling mill, preferably a CSP hot rolling mill, by the characterizing features of claim 1.
Advantageous embodiments of the invention are defined in the dependent claims.
For rolling of extremely thin strips, according to the invention a toiler, for example, a rotor toiler, is pivoted into the rolling train behind the last rolling stand and before the runout roller table. The first strip is then coiled at its high runout speed onto the first mandrel of the rotor toiler to a first coil, then the mandrels of the rotor toiler are pivoted by 180° . While the first strip is now uncoiledw by the slower transport speed (maximally 12.5 m/s) and transported via the runout roller table to the underfloor coiler, the following strip is coiled at its high runout speed as a second coil onto the second mandrel of the rotor coiler. Subsequently, the mandrels of the rotor coiler are again pivoted by 180° and the next strip can now be coiled. In this way, the coiling and uncoiling can be performed continuously.
Because the strip is coiled directly after exiting from the last roll stand at its high final rolling speed or runout speed, but is then instantly uncoiled - at a substantially slower transport speed - the rolling mill is decoupled from the runout roller table so that high final rolling or runout speeds and low transport speeds are possible simultaneously, and disadvantages and problems are no longer caused by a too high runout speed even when the runout speed is > 12.5 m/s.and is, for example, 20 m/s and the transport speed at < 12.5 m/s is substantially slower.
There is no effect on the slab or coil sequence by means of the measure of coiling and uncoiling because, according to the invention, the coiling of the subsequent strip is carried out already during uncoiling. Since the coiling as a result of the higher speed is completed faster than the simultaneous uncoiling of the preceding strip, the rotor coiler is pivoted by 180° only subsequent to the uncoiling process being completed. Therefore, the wound coil is subjected to a small pause which advantageously results in a temperature compensation of different strip areas. A
further advantage of the invention resides in that after completion of coiling and uncoiling, the ends of the strip are switched with one another and the original strip end is now guided first onto the runout roller table for cooling.
A rolling mill for performing the method according to the invention comprises a coiler, for example, a rotor coiler, which is arranged so as to be moveable into the rolling train behind the last roll stand and before the runout roller table, which comprises two coiling mandrels displaced relative to one another by 180°, and which is configured to be pivotable with its mandrels by 180°.
Further advantages, details, and features of the invention are explained in more detail in the following with the aid of an embodiment illustrated in the schematic drawing figures.
It is shown in:
Fig. 1 a detail of a conventional rolling mill with rotor coiler according to the invention;
Fig. 2 a diagram of the different strip speeds;
Fig. 3 a plan view onto a detail of the rolling mill according to Fig. 1, Fig. 4 a plan view onto a detail of a rolling mill with a further embodiment of the invention.
Fig. 1 shows a continuous casting device 1 (this is a two-strand device) which has arranged downstream thereof a cutting device 2, a compensation furnace 3, a further cutting device 4 as well as a multi-high rolling mill 5. Behind the rolling mill 5 there is a runout roller table 10 with devices 6 for cooling, and finally a deflection roll 9 with a successive underfloor coiler 7 for coiling the finished strip.
According to the invention, a rotor coiler 8 with two coiling mandrels 8', 8 " is moved into this conventional hot strip rolling mill directly behind the last roll stand of the rolling mill 5.
The strip coming from the roll stand, when exiting the rolling mill, is then guided about the first deflection roll 9' into this underfloor rotor coiler 8 and coiled onto the mandrel 8' as a coiled strip 11. The strip is uncoiled as a feed strip 12 from the second mandrel 8 ", which is displaced relative to the first mandrel 8' by 180°, and guided across the second deflection roll 9" back into the rolling train onto the runout roller table 10.
The two coiling mandrels 8', 8 " of the underfloor rotor coiler 8 can be driven independently from one another so that different coiling and uncoiling speeds according to the invention can be realized.
Fig. 2 shows schematically, matching Fig. l, the speeds of the strip present within the hot strip rolling mill. At the speed Vslab or vs the thin slabs are cast and then moved into the compensation furnace 3 and into the rolling mill 5. This is followed by the runout speed vrolling or yr with which the finish-rolled thin strip 11 is coiled onto the underfloor rotor coiler 8. From this rotor coiler 8 the preceding strip is then uncoiled as a feed strip 12 at the speed Vtransport or vt to the underfloor coiler 7 via the runout roller table 10.
In Fig. 3 a detail of Fig. 1 is illustrated in a schematic plan view. The strip which exits the rolling stand 5 at the coiling speed yr is coiled - as the coiled strip 11 - onto the mandrel 8' of the rotor coiler 8. At the same time, the feed strip 12 is then uncoiled at the transport speed vt from the second mandrel 8 " of the rotor coiler 8 arranged in the transport direction behind the mandrel 8'.
As soon as the feed strip 12 has completely been removed from the mandrel 8 " - as a result of the higher coiling speed yr the coiled strip 11 has already been completely coiled - a pivoting of the mandrels 8' and 8" about the pivot point 15 by 180° takes place so that the two mandrels 8', 8 " switch their positions. The feeding mandrel 8 " which is now empty is then positioned in the position of the previous coiling mandrel 8' and the full coiling mandrel 8' is in the position of the previous feeding mandrel 8 " .
In order to be able to carry out during this position change the coiling onto and uncoiling from onto the mandrels 8' and 8 ", the two mandrels 8' and 8 " are displaced relative to one another by 180° so that each mandrel 8', 8 ", after the position change, is in the same alignment as the previous mandrel.
Pivoting of the mandrels 8, 8 " for a position change can be carried out in any direction according to the arrows 14 but also in only one direction, for example, only in the clockwise direction.
In order to be able to dispense with the use of the measures of the invention for the rolling of thicker strips at the lower runout speed yr and to supply the strip directly to the cooling action, the coiler 8 is arranged to be laterally pivotable into and out of the rolling train according to the direction of arrow 13. Pivoting into and out of the rolling train is also possible from below -this is not illustrated in the drawing figures.
In Fig. 4, a further possible embodiment of the invention is illustrated in a plan view. In this embodiment of Fig. 4 the two mandrels 8', 8 " are not successively arranged in the transport direction, as in Fig. 3, but adjacently. The position change is carried out by rotation of the two mandrels 8', 8 " by 180° in the direction of arrow 14 but now about the pivot point 16 arranged laterally adjacent to the coiled strip 11 and the feed strip 12.
In the following table the resulting cycle times for manufacturing a thin strip are illustrated for one embodiment.
slab casting rolling to 0.8 mm, uncoiling/cooling 50 x 50 mm coiling vs = 5 . 5 m/mi n yr = 2 0 m/ s vt = 12 . 5 m/ s 9 min/slab coiling 2.6 min pivoting - 0.3 min (2-strand device) pause 1.6 min uncoiling = 4.2 min pivoting 0.3 min slab sequence coil sequence coil sequence - 4.5 min - 4.5 min - 4.5 min The table shows that with the measure of the invention only a time shift corresponding to a slab sequence will result with which the rolled strip is supplied to the cooling devise.
The invention is not limited to the illustrated and described embodiment but can also be adjusted according to the available conditions in accordance with the configuration of a hot rolling mill that is already present or is to be configured when in this context the basic principle of the invention is observed according to which the thin strip is coiled directly after rolling at its high runout speed and then it is uncoiled at a correspondingly reduced speed.
In an article ("Around-up of CSP thin slab", Steel Times-incorporation Iron and Steel, GB, Fuel and Metallurgical journals Ltd., London, Vol. 226, No. 5, 1 May 1998, pages 175, 176, 178) the layout of a CSP hot rolling mill is described which is comprised of two casting lines, a mufti-stand rolling mill and a cooling stretch. The rolling mill has arranged downstream thereof a coiler with two horizontal mandrels located on a vertical turntable. The mandrel oriented toward the rolling mill is provided for coiling the strip exiting the rolling mill. After initial coiling, the two mandrels are pivoted by 180° . While the strip is finish-coiled onto the mandrel facing the rolling mill to a coil, a free mandrel is available for initial coiling of the successive strip - without any loss of time.
In order to be able to roll on CSP hot rolling mills thin strips under austenitic conditions, extremely high runout speeds (up to approximately 20 m/s) are required. A safe transport of the rolled strip on the runout roller table is, however, possible only at maximally 12 m/s and up to a point where the strip end exiting the last rolling stand is engaged by the underfloor toiler and is then coiled. Only thereafter the rolling mill can be accelerated to higher runout speeds. For such a rolling strategy, different rolling conditions and the great spacing between the last roll stand and the underfloor toiler have the result that the rolled leading end of the strip does not have the desired mechanical material properties. They are reached only when already approximately 130 m have been rolled so that the output of the mill is thus reduced.
Based on this prior art, it is an object of the invention to provide a method which can control the higher final rolling speed or runout speed resulting in the production of thin strips below 1.2 mm with simple means such that for known methods and rolling mills the resulting disadvantages, such as, for example, an unfavorable removal or a high apparatus expenditure, in combination with additional operating costs, can be substantially prevented by additional heating or cooling.
This object is solved by a hot rolling mill, preferably a CSP hot rolling mill, by the characterizing features of claim 1.
Advantageous embodiments of the invention are defined in the dependent claims.
For rolling of extremely thin strips, according to the invention a toiler, for example, a rotor toiler, is pivoted into the rolling train behind the last rolling stand and before the runout roller table. The first strip is then coiled at its high runout speed onto the first mandrel of the rotor toiler to a first coil, then the mandrels of the rotor toiler are pivoted by 180° . While the first strip is now uncoiledw by the slower transport speed (maximally 12.5 m/s) and transported via the runout roller table to the underfloor coiler, the following strip is coiled at its high runout speed as a second coil onto the second mandrel of the rotor coiler. Subsequently, the mandrels of the rotor coiler are again pivoted by 180° and the next strip can now be coiled. In this way, the coiling and uncoiling can be performed continuously.
Because the strip is coiled directly after exiting from the last roll stand at its high final rolling speed or runout speed, but is then instantly uncoiled - at a substantially slower transport speed - the rolling mill is decoupled from the runout roller table so that high final rolling or runout speeds and low transport speeds are possible simultaneously, and disadvantages and problems are no longer caused by a too high runout speed even when the runout speed is > 12.5 m/s.and is, for example, 20 m/s and the transport speed at < 12.5 m/s is substantially slower.
There is no effect on the slab or coil sequence by means of the measure of coiling and uncoiling because, according to the invention, the coiling of the subsequent strip is carried out already during uncoiling. Since the coiling as a result of the higher speed is completed faster than the simultaneous uncoiling of the preceding strip, the rotor coiler is pivoted by 180° only subsequent to the uncoiling process being completed. Therefore, the wound coil is subjected to a small pause which advantageously results in a temperature compensation of different strip areas. A
further advantage of the invention resides in that after completion of coiling and uncoiling, the ends of the strip are switched with one another and the original strip end is now guided first onto the runout roller table for cooling.
A rolling mill for performing the method according to the invention comprises a coiler, for example, a rotor coiler, which is arranged so as to be moveable into the rolling train behind the last roll stand and before the runout roller table, which comprises two coiling mandrels displaced relative to one another by 180°, and which is configured to be pivotable with its mandrels by 180°.
Further advantages, details, and features of the invention are explained in more detail in the following with the aid of an embodiment illustrated in the schematic drawing figures.
It is shown in:
Fig. 1 a detail of a conventional rolling mill with rotor coiler according to the invention;
Fig. 2 a diagram of the different strip speeds;
Fig. 3 a plan view onto a detail of the rolling mill according to Fig. 1, Fig. 4 a plan view onto a detail of a rolling mill with a further embodiment of the invention.
Fig. 1 shows a continuous casting device 1 (this is a two-strand device) which has arranged downstream thereof a cutting device 2, a compensation furnace 3, a further cutting device 4 as well as a multi-high rolling mill 5. Behind the rolling mill 5 there is a runout roller table 10 with devices 6 for cooling, and finally a deflection roll 9 with a successive underfloor coiler 7 for coiling the finished strip.
According to the invention, a rotor coiler 8 with two coiling mandrels 8', 8 " is moved into this conventional hot strip rolling mill directly behind the last roll stand of the rolling mill 5.
The strip coming from the roll stand, when exiting the rolling mill, is then guided about the first deflection roll 9' into this underfloor rotor coiler 8 and coiled onto the mandrel 8' as a coiled strip 11. The strip is uncoiled as a feed strip 12 from the second mandrel 8 ", which is displaced relative to the first mandrel 8' by 180°, and guided across the second deflection roll 9" back into the rolling train onto the runout roller table 10.
The two coiling mandrels 8', 8 " of the underfloor rotor coiler 8 can be driven independently from one another so that different coiling and uncoiling speeds according to the invention can be realized.
Fig. 2 shows schematically, matching Fig. l, the speeds of the strip present within the hot strip rolling mill. At the speed Vslab or vs the thin slabs are cast and then moved into the compensation furnace 3 and into the rolling mill 5. This is followed by the runout speed vrolling or yr with which the finish-rolled thin strip 11 is coiled onto the underfloor rotor coiler 8. From this rotor coiler 8 the preceding strip is then uncoiled as a feed strip 12 at the speed Vtransport or vt to the underfloor coiler 7 via the runout roller table 10.
In Fig. 3 a detail of Fig. 1 is illustrated in a schematic plan view. The strip which exits the rolling stand 5 at the coiling speed yr is coiled - as the coiled strip 11 - onto the mandrel 8' of the rotor coiler 8. At the same time, the feed strip 12 is then uncoiled at the transport speed vt from the second mandrel 8 " of the rotor coiler 8 arranged in the transport direction behind the mandrel 8'.
As soon as the feed strip 12 has completely been removed from the mandrel 8 " - as a result of the higher coiling speed yr the coiled strip 11 has already been completely coiled - a pivoting of the mandrels 8' and 8" about the pivot point 15 by 180° takes place so that the two mandrels 8', 8 " switch their positions. The feeding mandrel 8 " which is now empty is then positioned in the position of the previous coiling mandrel 8' and the full coiling mandrel 8' is in the position of the previous feeding mandrel 8 " .
In order to be able to carry out during this position change the coiling onto and uncoiling from onto the mandrels 8' and 8 ", the two mandrels 8' and 8 " are displaced relative to one another by 180° so that each mandrel 8', 8 ", after the position change, is in the same alignment as the previous mandrel.
Pivoting of the mandrels 8, 8 " for a position change can be carried out in any direction according to the arrows 14 but also in only one direction, for example, only in the clockwise direction.
In order to be able to dispense with the use of the measures of the invention for the rolling of thicker strips at the lower runout speed yr and to supply the strip directly to the cooling action, the coiler 8 is arranged to be laterally pivotable into and out of the rolling train according to the direction of arrow 13. Pivoting into and out of the rolling train is also possible from below -this is not illustrated in the drawing figures.
In Fig. 4, a further possible embodiment of the invention is illustrated in a plan view. In this embodiment of Fig. 4 the two mandrels 8', 8 " are not successively arranged in the transport direction, as in Fig. 3, but adjacently. The position change is carried out by rotation of the two mandrels 8', 8 " by 180° in the direction of arrow 14 but now about the pivot point 16 arranged laterally adjacent to the coiled strip 11 and the feed strip 12.
In the following table the resulting cycle times for manufacturing a thin strip are illustrated for one embodiment.
slab casting rolling to 0.8 mm, uncoiling/cooling 50 x 50 mm coiling vs = 5 . 5 m/mi n yr = 2 0 m/ s vt = 12 . 5 m/ s 9 min/slab coiling 2.6 min pivoting - 0.3 min (2-strand device) pause 1.6 min uncoiling = 4.2 min pivoting 0.3 min slab sequence coil sequence coil sequence - 4.5 min - 4.5 min - 4.5 min The table shows that with the measure of the invention only a time shift corresponding to a slab sequence will result with which the rolled strip is supplied to the cooling devise.
The invention is not limited to the illustrated and described embodiment but can also be adjusted according to the available conditions in accordance with the configuration of a hot rolling mill that is already present or is to be configured when in this context the basic principle of the invention is observed according to which the thin strip is coiled directly after rolling at its high runout speed and then it is uncoiled at a correspondingly reduced speed.
Claims (6)
1. Method for austenitic rolling of thin strips in hot rolling mills, preferably in CSP hot rolling mills, comprised of a multi-stand rolling mill (5), a runout roller table (10) with devices (6) for cooling the rolled strip, and coilers (7) arranged downstream for coiling the strip, characterized in that the strip, directly after exiting the last rolling stand of the rolling mills (5), is coiled at its runout speed (v r) as a coiled strip (11) onto a coiler (8) and is uncoiled directly thereafter at a slower transport speed (v t) as a feed strip (12).
2. Method according to claim 1, characterized in that the runout speed (v r) is >= 12.5 m/s and the transport speed (v t) is <=
12.5 m/s.
12.5 m/s.
3. Method according to claim 1 or 2, characterized by a continuously performed process course wherein the coiled strip (11) is coiled onto the mandrel (8') of a coiler (8), for example, a rotor coiler, at its runout speed (v r), and, subsequently, after pivoting the coiler (8) by 180°, is uncoiled again at a changed transport speed (v t) as a feeding strip (12), wherein, at the same time, a successive strip is coiled at its runout speed (v r) onto a second mandrel 8' of the coiler (8) as a new coiled strip (11).
4. Rolling mill for austenitic rolling of thin strips in hot rolling mills, preferably in CSP hot rolling mills, comprised of a multi-stand rolling mill (5), a runout roller table (10) with devices (6) for cooling the rolled strip, and coilers (7) arranged downstream for coiling the strip, for performing the method according to one or several of the preceding claims, characterized in that between the last roll stand of the multi-stand rolling mill (5) and the runout roller table (10) a coiler (8), preferably a rotor coiler, is arranged which is pivotable by 180°.
5. Rolling mill according to claim 4, characterized in that the coiler (8) is provided with two independent coiling 8' and uncoiling mandrels 8" which are displaced relative to one another by 180°.
6. Rolling mill according to claim 4 or 5, characterized in that the coiler (8) is configured to be pivoted into the rolling train.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1999125536 DE19925536A1 (en) | 1999-06-04 | 1999-06-04 | Method and rolling plant for the austenitic rolling of thin strips |
| DE19925536.9 | 1999-06-04 | ||
| PCT/EP2000/005088 WO2000074867A1 (en) | 1999-06-04 | 2000-06-05 | Method and rolling installation for the austenitic rolling of thin strips |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2375117A1 true CA2375117A1 (en) | 2000-12-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002375117A Abandoned CA2375117A1 (en) | 1999-06-04 | 2000-06-05 | Method and rolling installation for the austenitic rolling of thin strips |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1183113A1 (en) |
| JP (1) | JP2003501262A (en) |
| CN (1) | CN1364103A (en) |
| BR (1) | BR0011243A (en) |
| CA (1) | CA2375117A1 (en) |
| DE (1) | DE19925536A1 (en) |
| MX (1) | MXPA01012415A (en) |
| WO (1) | WO2000074867A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170589B (en) * | 2013-02-01 | 2015-05-27 | 青岛云路新能源科技有限公司 | Online reeling device for amorphous ribbon |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE972603C (en) * | 1950-08-03 | 1959-09-10 | Kocks Gmbh Friedrich | Continuously working rolling mill for hot rolling of wide strip |
| DE2251182B2 (en) * | 1972-10-19 | 1976-07-15 | Demag Ag, 4100 Duisburg | PROCEDURE FOR PUSHING AN UNUSABLE REMAINING COLLAR FROM A SINGLE-SIDED REEL PIN OF A STRAP REEL |
| JPH02268904A (en) * | 1989-04-10 | 1990-11-02 | Sumitomo Metal Ind Ltd | Manufacture of hot rolled steel sheet by line division |
| JPH0957303A (en) * | 1995-08-22 | 1997-03-04 | Nippon Steel Corp | Continuous hot rolling equipment |
| IT1290743B1 (en) * | 1997-04-10 | 1998-12-10 | Danieli Off Mecc | LAMINATION PROCESS FOR FLAT PRODUCTS WITH THIN THICKNESSES AND RELATED ROLLING LINE |
| WO1999003612A1 (en) * | 1997-07-15 | 1999-01-28 | Danieli & C. Officine Meccaniche S.P.A. | Coiling machine for hot rolled stock such as strip or sheet and relative coiling method |
-
1999
- 1999-06-04 DE DE1999125536 patent/DE19925536A1/en not_active Withdrawn
-
2000
- 2000-06-05 CA CA002375117A patent/CA2375117A1/en not_active Abandoned
- 2000-06-05 CN CN 00810773 patent/CN1364103A/en active Pending
- 2000-06-05 EP EP00935166A patent/EP1183113A1/en not_active Withdrawn
- 2000-06-05 MX MXPA01012415A patent/MXPA01012415A/en unknown
- 2000-06-05 BR BR0011243-7A patent/BR0011243A/en not_active Application Discontinuation
- 2000-06-05 JP JP2001501385A patent/JP2003501262A/en not_active Withdrawn
- 2000-06-05 WO PCT/EP2000/005088 patent/WO2000074867A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| BR0011243A (en) | 2002-03-05 |
| DE19925536A1 (en) | 2000-12-07 |
| CN1364103A (en) | 2002-08-14 |
| JP2003501262A (en) | 2003-01-14 |
| WO2000074867A1 (en) | 2000-12-14 |
| MXPA01012415A (en) | 2002-07-30 |
| EP1183113A1 (en) | 2002-03-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |