| Title of Invention | OPERATING METHOD FOR A REVERSING ROLLING MILL |
|---|---|
| Abstract | The invention relates to a reverse rolling mill comprising at least one reversing stand (1) for rolling a rolled material (5), two roller tables (2,3) which are used for transporting the rolled material (5) and which are arranged on both sides of the reversing stand (1), and a control device (4) for controlling the reverse rolling mill. The roller tables (2,3) comprise several roller table areas (6) and each area comprises at least one conveyor roller (7). The conveyor rollers (7) of each roller table area (6) can be controlled independently from the conveyor rollers (7) of the other roller table areas (6). The rolled material (5) is conveyed in such a way that the front of the rolled material is displaced at an intake speed (vE) and the end of the rolled material is displaced at a delivery speed (vA). The control device (4) indivi dually calculates an earliest intake time point (TE), in relation to the reversing stand (1), at least for each roller table area (6) located on the delivery side with respect to the respective conveyor step, at which the rolled material is taken into the respective roller table area (6) and controls the conveyr rollers of said area (7) in such a way that the peripheral speed is matched to the intake speed (vE), at the latest, at the intake time point (TE). |
| Full Text | Description Operating method for a reversing rolling mill The present invention relates to an operating method for a reversing rolling mill that has at least one reversing stand for rolling a rolling material, two roller tables, arranged on both sides of the reversing stand, for conveying the rolling material, and a control device for controlling the reversing rolling mill, the roller tables respectively having a number of roller table areas of which each has at least one conveyor roller, it being possible to drive the conveyor rollers of each roller table area independently of the conveyor rollers of the other roller table area, the rolling material being conveyed in such a way that a fore end of the rolling material is conveyed at an entry speed, and a rear end of the rolling material is conveyed at an exit speed. Furthermore, the present invention relates to a data medium having a computer program, stored on the data medium, for carrying out such an operating method when the computer program is executed by a control device for a reversing rolling mill. The present invention also relates to a control device for a reversing rolling mill which is designed, in particular programmed, in such a way that the reversing rolling mill can be driven by it in accordance with such an operating method. The present invention further relates to a reversing rolling mill and to a rolling material produced in accordance with the inventive operating method. Operating methods, data media, control devices, reversing rolling mills and rolling materials of the type mentioned at the beginning are generally known. In so-called continuous trains rolling material - in particular strip-shaped - is always conveyed in the same direction on its roller tables. As a rule, even the conveying speed at which the rolling material is transported is at least substantially constant. It is therefore possible in a relatively simple way to drive the roller tables in such a way that the circumferential speeds of the conveyor rollers correspond to the conveying speed of the rolling material. In reversing stands, by contrast, the rolling material traverses one and the same rolling stand several times consecutively, the rolling direction alternating in each case. The rolling material must therefore always be repeatedly accelerated and braked. For the same reason, it is also necessary for the conveyor rollers to be repeatedly accelerated and braked. Nevertheless, the circumferential speeds of the conveyor rollers should as far as possible correspond to the conveying speed of the rolling material. The point is that relative movements between rolling material and conveyor rollers impair the quality of the rolling material surface, and furthermore load the drives of the conveyor rollers. In order to ensure the synchronous running of the conveyor rollers of the roller table areas and of the rolling material, it is known in the prior art for the conveyor rollers or all roller table areas that can come into contact with the rolling material to be accelerated and braked with the rolling material. This results in processes of acceleration and braking that, firstly, are partly not even necessary and therefore load the drives unnecessarily and, secondly, can above all occur simultaneously and therefore lead to undesired network feedback. Unnecessary energy is, furthermore, frequently consumed. In order to avoid the abovenamed disadvantages, it is, furthermore, known in the prior art that the control device determines a time at which the rolling material enters the respective roller table area and, from this time, accelerates the conveyor rollers of the directly adjacent roller table area into which the rolling material next enters. Unnecessary acceleration processes and undesired network feedback can largely be avoided by means of this mode of procedure. However, it is no longer ensured that the conveyor rollers of the directly adjacent roller table area have already reached the conveying speed when the rolling material enters this directly adjacent roller table area. The object of the present invention consists in providing an operating method for a reversing rolling ir.ill by means of which it is possible, on the one hand, to avoid unnecessary acceleration processes and distribute required acceleration processes over time, and on the other hand to ensure that the circumferential speed of the conveyor rollers is adapted to the conveying speed of the rolling material when the rolling material enters the respective roller table area. The object is achieved in the case of an operating method of the type mentioned at the beginning by virtue of the fact that, at least for each roller table area arranged on the exit side with reference to the respective conveying operation with reference to the reversing stand, the control device individually calculates a entry time at which the rolling material enters at the earliest into the respective roller table area, and whose conveyor rollers are driven in such a way that the circumferential speed is adjusted to the entry speed at the latest at the entry time.. In a fashion corresponding to this, the object for the data medium is achieved by virtue of the fact that stored on it is a computer program, which acts to carry out such an operating method when the computer program is executed by a control device for a reversing rolling mill. Furthermore, the object is also achieved by a control device for a reversing rolling mill which is designed, in particular programmed, in such a way that the reversing rolling mill can be driven by it in accordance with such an operating method. Furthermore, the object is achieved by means of a reversing rolling mill that is provided with such a control device. In accordance with the present invention, the control device thus uses data prescribed for it and relating, in particular, to the speed profile for the rolling material on the entry side and on the exit side - referred to the respective conveying operation and the reversing stand - to the strip length and the instantaneous position of the fore end of the rolling material to calculate the time at which the rolling material reaches the respective roller table area at the earliest, and which entry speed the fore end of the rolling material has at this time. The control device can therefore use the instantaneous circumferential speeds of the conveyor rollers of the roller table areas, and the maximum possible accelerations of the conveyor rollers of the relevant roller table areas to count back to when it is necessary to begin to adapt the circumferential speed of the conveyor rollers of the respective roller table area. The start time for adapting the circumferential speed of the conveyor rollers to the entry speed - dependent on speed, if appropriate - can therefore be determined in an ordinary way in advance. As a rule, the rolling material is rolled in the reversing stand. In this case, during the rolling process the entry speed (= speed of the fore end of the rolling material) and the exit speed (= speed of the rear end of the rolling material) are, of course, different from one another. Furthermore, they are also different as a rule from a circumferential speed of work rolls of the reversing stand. However, the present invention is intended also to include the special case that the rolling material is simply conveyed, and thus that the rolling material is not worked during the conveyance. When a start is made in conveying the rolling material, it is possible that the remaining time no longer suffices to accelerate the conveyor rollers up to the entry speed of one of the roller table areas near the reversing stand and arranged on the exit side with reference to the respective conveying operation with reference to the reversing stand. In order also to ensure in this case that the conveyor rollers of the relevant roller table area are accelerated up to the entry speed, it is provided that before the conveyance of the rolling material the control device determines for at least one of the roller table areas arranged on the exit side with reference to the respective conveying operation with reference to the reversing stand a minimum time period that is required in order to adjust the circumferential speed of the conveyor rollers of the relevant roller table area to the entry speed, and delays the beginning of the conveyance of the rolling material and approximates the circumferential speed of the conveyor rollers of the relevant roller table area to the entry speed as long as the minimum time period is greater than a conveyance period that corresponds to the difference between the entry time and the beginning of the conveyance of the rolling material. This last-described mode of procedure is particularly sensible for the roller table area that directly adjoins the reversing stand on the exit side with reference to the respective conveying operation with reference to the reversing stand. At least for each roller table area arranged on the exit side with reference to the respective conveying operation with reference to the reversing stand, the control device preferably controls the adjustment of the circumferential speed of the conveyor rollers of the respective roller table area to the entry speed in accordance with an acceleration profile that is individual for the respective roller table area, the acceleration profile being determined in such a way that a control margin remains. The point is that it is then possible to correct unforeseen changes in the entry speed. The control margin is realized in the case of a given maximum acceleration by virtue of the fact that the time period for adjusting the circumferential speed to the entry speed is determined as being greater than the abovementioned minimum time period. The abovedescribed mode of procedure can be adopted not only on the exit side, but also on the entry side as long as the fore end of the rolling material has thus not yet reached the reversing stand. In these cases, instead of the entry speed it is possible to use the exit speed, that is to say the speed at which the rear end of the rolling material is moving. The point is that as long as the fore end of the rolling material has not yet reached the reversing stand, the entry speed and the exit speed are identical. In an analogous way to the driving of the roller table areas when the rolling material enters into the respective roller table area, a similar driving of the roller table areas can be sensible even during the exiting of the rear end of the rolling material from a rolling table area - at least on the entry side of the reversing stand. In this case, at least for each roller table area arranged on the entry side with reference to the respective conveying operation with reference to the reversing stand, the control device individually calculates an exit time at which the rolling material exits at the latest into the respective roller table area, and whose conveyor rollers are driven in such a way that the circumferential speed is lowered to less than the exit speed at the earliest at the exit time. The time at which a start is made with lowering the circumferential speed should preferably lie ahead of the time at which the rear end of the rolling material exits from the roller table area directly adjoining in the direction of the reversing stand. The control device must compute the entry time in the course of the timely acceleration of the conveyor rollers before the rolling material enters into the respective roller table area. The same mode of procedure is possible in the course of the lowering of the circumferential speed of the conveyor rollers after the rolling material exits from the respective roller table area. It is also possible here as an alternative to 202detect mechanically when the rolling material exits, for example by means of the loading of the drives of the relevant conveyor rollers. Further advantages and details emerge from the following description of an exemplary embodiment in conjunction with the drawings, in which, in a schematic representation: figure 1 shows a reversing rolling mill, and figures 2 to 5 show flowcharts.. In accordance with figure 1, a reversing rolling mill has a reversing stand 1, two roller tables 2, 3 arranged on both sides of the reversing stand 1, and a control device 4. The reversing stand 1 serves for the reversing rolling of a rolling material 5, in particular a strip-shaped rolling material 5. The roller tables 2, 3 serve for conveying the rolling material 5. The control device 4 effects the control of the reversing rolling mill, that is to say of the reversing stand 1 and the roller tables 2, 3, in particular. The roller tables 2, 3 respectively have a number of roller table areas 6. Each roller table area 6 has at least one conveyor roller 7. The conveyor roller 7 of each roller table area 6 can be driven by the control device 4 independently of the conveyor rollers 7 of the other roller table areas 6. In particular, the conveyor rollers 7 of each roller table area 6 are'respectively assigned at least one dedicated drive 8. The first step in implementing the present invention is to write a computer program 9 for the control device 4. This computer program 9 is stored in an (exclusively) machine readable form on a data medium 10. The data medium 10 can be, for example, an internal data medium of the control device 4 or another computer, not illustrated for reasons of clarity. However, the data medium 10 can also be a transportable data medium 10 such as, for example, a CD-ROM 10, a memory card or a USB memory stick. The computer program 9 is loaded into the control device 4 and stored there, for example on the hard disk thereof. If the computer program 9 is called up on the basis of corresponding call conditions (for example a user input), the control device 4 drives the reversing rolling mill in accordance with an operating method that is explained in more detail below in conjunction with figures 2 to 5. Storing the computer program 9 in the control device 4 thus means that the latter is appropriately programmed or of more general design. In accordance with figure 2, the control device 4 receives various parameters in a step Si. Thus, in step SI the control device 4 firstly receives an initial position pA. The initial position pA characterizes the position pA of a fore end 11 of the rolling material 5 at the instantaneous time t. Furthermore, the control device 4 also receives a corresponding final position pE of a rear end 12 of the rolling material 5 at the instantaneous time t. Furthermore, the control device 4 receives a conveying speed vT of the rolling material 5. The conveying speed vT specifies the speed at which the rolling material 5 is to be fed to the reversing stand 1. Finally, the control device 4 receives stand settings of the reversing stand 1. The step SI is executed at a time at which the fore end 11 of the rolling material has not yet reached the reversing stand 1. It is therefore possible in the course of a step S2 for the control device 4 to undertake the following determinations: Firstly with the aid of the initial position pA and of the conveying speed vT it can determine a time at which the fore end 11 of the rolling material enters into the reversing stand 1. Before this time, the entry speed vE at which the fore end 11 of the rolling material enters into the roller table areas 6 arranged on the entry side is equal to the conveying speed vT. Starting from this time, the entry speed vE at which the fore end 11 of the rolling material enters into the roller table area 6 on the exit side is determined by the quotient of the conveying speed vT and a relative pass reduction h. In a similar way, the control device 4 uses the final position pE and the conveying speed vT to determine the time at which the rear end 12 of the rolling material enters into the reversing stand 1. Before this time, an exit speed vA at which the rear end 12 of the rolling material exits from the roller table area 6 on the entry side is equal to the conveying speed vT. After this time, the exit speed vA at which the rear end 12 of the roller material exits from the roller table areas 6 arranged on the exit side is determined by the quotient of conveying speed vT and relative pass reduction h. The terms "entry speed" and "exit speed" thus denote in the scope of the present invention the speeds at which the fore end 11 of the rolling material enters into the roller table areas 6 and, respectively at which the rear end 12 of the rolling material exits from the roller table areas 6. They are thus used differently than normal. The relative pass reduction 8h can be explicitly determined by the Stand parameters. However, it is also possible for the control device 4 itself to determine the relative pass reduction 8h with the aid of the stand settings. As a result, in step S2 the control device 4 thus determines the time profiles both of the entry speed vE and of the exit speed vA. It is therefore capable of determining in advance the position at which the fore end 11 of the rolling material and the rear end 12 of the rolling material, are located at any desired time t. In a step S3, the control device firstly selects that one of the roller table areas 6 which directly adjoins the reversing stand 1 on the exit side. It therefore selects the roller table area 6 into which the rolling material 5 firstly enters after being rolled by the reversing stand 1. In a step S4, it undertakes the required adaptations of the rotation speed vU of the conveyor roller 7 of the selected roller table area 6. The step S4 is explained in more detail in conjunction with figure 3. In a step S5, the control device 4 then checks whether it has already carried out the step S4 for all roller table areas 6 arranged on the exit side. If this is not the case, the control device 4 selects in a step S6 the next roller table area 6 on the exit side, and returns to the step S4. In steps S7 to S10, the control device 4 carries out a mode of procedure, corresponding to the steps S3 to S6, with reference to the roller table areas 6 arranged on the entry side. Here, as well, the step S8 is explained in more detail in conjunction with figure 4. In a step S11, the control device 4 checks whether the conveyance of the rolling material 5 has ceased, and thus whether the respective conveying operation has ceased. If this is not the case, the control device 4 returns to the step S3. Otherwise, the control device 4 checks in a step S12 whether all the conveying operations (in particular all the rolling passes to be executed) have already been executed. If this is not the case, the control device 4 returns to the step SI. Otherwise, the inventive operating method has ceased. The control device 4 preferably proceeds as follows in accordance with figure 3 in order to implement the step S4 of figure 2: Firstly, with the aid of the initial position pA and the entry speed profile vE(t), it determines in a step S21 an entry time TE for the selected roller table area 6. Furthermore, with the aid of the final position pE and the exit speed profile vA(t), it determines (likewise in the course of the step S21) exit times TA and TA' for the selected roller table area 6 and for the roller table area 6 that adjoins the selected roller table area 6 in the direction of the conveying speed vT. In a step S22, the control device 4 next determines a start time TS. The start time TS is preferably determined by the formula TR is a time that is greater than zero. I": signifies a control margin. vE(TE) is the entry speed vE at which the fore end 11 of the rolling material enters into the selected roller table area 6 at. the entry time TE. vU(t) is the circumferential speed vU of the conveyor rollers 7 of the selected roller table area 6 at the instantaneous time t. a is a maximum acceleration of the conveyor roller 7 of the selected roller table 6. Furthermore, in a step S23, the control device 4 calculates a lowering time TA". The lowering time TA" is preferably determined by the formula k is a factor that lies between zero and one. It preferably lies in the vicinity of zero, for example between 0.0 and 0.2. In a step S24, the control device 4 checks whether the instantaneous time t has already exceeded the start time TS. If this is not the case, the control device 4 carries out in a step S25 a reaction that can be arbitrary within the scope of the present invention. By contrast, when the start time TS has been reached or exceeded, the control device 4 furthermore checks in a step S26 whether the entry time TE has already been exceeded, and thus whether the rolling material 5 has already reached the selected roller table area 6. If this is not the case, in a step S27 the control device 4 drives the conveyor rollers 7 in such a way that the circumferential speed vU thereof approximates the entry speed vE at the entry time TE. Since this adjustment in the step S27 is preferably performed with the maximum acceleration a, it is ensured that the circumferential speed vU of the conveyor rollers 7 is adjusted to the entry speed vE at the correct time, that is to say at the latest at the entry time TE. Moreover,, the time reserve TR remains as control margin for compensating any unforeseen changes in the entry speed vE. Furthermore, on the basis of the individual determination of the start time TS and of the individual entry speed vE at this time TS, the acceleration profile in conjunction with which the adjustment of the circumferential speed vU is performed is also individual to the respective roller table area 6. Even though the entry time TE has already been exceeded, the control device 4 checks in a step S28 whether the lowering time TA" has already been reached. If this is not the case, the control device 4 takes the circumferential speed vU of the conveyor roller 7 of the selected roller table area 6 at the entry speed vE given at the respective time t. Otherwise, in a step S30 it lowers the circumferential speed vU of the conveyor roller 7 of the selected roller table area 6. The reference speed for the circumferential speed vU is the entry speed vE in the step S29, while it is exit speed vA in the step S30. The contradiction between the steps S29 and S30 is, however, only apparent. The point is that the rolling material 5 has already been completely rolled at the lowering time TA". Consequently, both the fore end 11 of the rolling material and the rear end 12 of the rolling material are located on the exit side of the reversing stand 1. For this reason, after the lowering time TA" the exit speed vA is equal to the entry speed vE. The implementation of the step S8 of figure 2 that is illustrated in figure 4 corresponds very largely to figure 3. The sole difference resides in that instead of the step S29, in figure 4 a step S31 is executed in which the circumferential speed vU is kept at the exit speed vA. Here, as well, the contradiction with the step S27 is only an apparent one. The point is that owing to the circumstance that in the context of figure 4 the selected roller table area 6 is located on the entry side, the entry speed vE is equal to the exit speed vA when the fore end 11 of the rolling material enters into the selected roller table area 6. In accordance with figures 2 to 4, both the adjustment of the circumferential speed vU to the entry speed vE, and the lowering of the circumferential speed vU below the exit speed vA are executed for the conveyor rollers 7 of all the roller table areas 6, that is to say both on the entry side and on the exit side. However, it is possible to execute the inventive method only on the exit side. In this case, the steps S7 to 10, and also figure 4, can be omitted. Independently of whether the inventive operating method is executed only on the exit side or else on the entry side, it is possible, furthermore, to undertake only the adjustment of the circumferential speed vU to the entry speed vE, but no longer to undertake the lowering of the circumferential speed vU after the exit time TA. In this case, the steps S23, S28 and S30 can be omitted in figures 3 and 4. Thus, in this case there is always a transition directly to the step S29 from the step S26. Furthermore, in this case the determination of the exit times TA, TA' can be omitted in step S21. The procedure described so far already yields a substantial improvement over the prior art. However, the inventive operating method can be optimized even further using the refinement in accordance with figure 5. In accordance with figure 5, steps S41 to S46 are inserted between the steps S2 and S3 of figure 2. In the step S41, the control device 4 selects - in a similar way to the step S3 of figure 2 - the roller table area 6 that lies closest to the reversing stand 1 on the exit side. The control device 4 determines a conveying time 8t in step S42. The conveying time 8t corresponds to the time period that elapses from the beginning of the conveyance of the rolling material 5 up to the entry time TE of the fore end 11 of the rolling material into the selected roller table area 6. The control device 4 determines a minimum time TM in the step S43 in accordance with the formula The variables used in this formula have all already been defined. The control device 4 checks in the step S44 as to whether the conveying time 8t exceeds the minimum tirr.e TM. If this is not the case, in the step S45 the control device 4 approximates the circumferential speed vU of the conveyor roller 7 of the selected roller table area 6 to the entry speed vE. Otherwise, it beings the conveyance of the rolling material 5 in the step S46. In accordance with figure 5, the beginning of the conveyance of the rolling material 5 is delayed only as a function of the data for the roller table area 6 lying closest to the rolling stand 1 on the exit side. However, it can also be theoretically possible, of course, also to carry out the steps S41 to S46 for the other roller table area 6 on the exit side. However, the mode of procedure in accordance with figure 5 suffices as a rule. The inventive operating method therefore ensures that all the conveyor rollers 7 that are in contact with the rolling material 5 always exhibit a circumferential speed vU that corresponds to the conveying speed of the rolling material 5 in the relevant roller table area 6. Patent claims 1. An operating method for a reversing rolling mill that has at least one reversing stand (1) for rolling a rolling material (5), two roller tables (2, 3), arranged on both sides of the reversing stand (1), for conveying the rolling material (5), and a control device (4) for controlling the reversing rolling mill, the roller tables (2, 3) respectively having a number of roller table areas (6) of which each has at least one conveyor roller (7), it being possible to drive the conveyor rollers (7) of each roller table area (6) independently of the conveyor rollers (7) of the other roller table area (6), the rolling material (5) being conveyed in such a way that a fore end (11) of the rolling material (5) is conveyed at an entry speed (vE) , and a rear end (12) of the rolling material (5) is conveyed at an exit speed (vA), characterized in that, at least for each roller table area (6) arranged on the exit side with reference to the respective conveying operation with reference to the reversing stand (1), the control device (4) individually calculates an entry time (TE) at which the rolling material (5) enters at the earliest into the respective roller table area (6), and whose conveyor rollers (7) are driven in such a way that the circumferential speed (vU) is adjusted to the entry speed (vE) at the latest, at the entry time (TE) . 2. The operating method as claimed in claim 1, characterized in that before the conveyance of the rolling material (5) the control device (4) determines for at least one of the roller table areas (6) arranged on the exit side with reference to the respective conveying operation with reference to the reversing stand (1) a minimum time period (tM) that is required in order to adjust the circumferential speed (vU) of the conveyor rollers (7) of the relevant roller table area (6) to the entry speed (vE), and in that the control device (4) delays the beginning of the conveyance of the rolling material (5) and approximates the circumferential speed (vU) of the conveyor rollers (7) of -the relevant roller table area (6) to the entry speed (vE) as long as the minimum time period (TM) is greater than a conveyance period (8t) that corresponds to the difference between the entry time (TE) and the beginning of the conveyance of the rolling material (5). 3. The operating method as claimed in claim 2, characterized in that the at least one roller table area (6) arranged on the exit side with reference to the respective conveying operation with reference to the reversing stand (1) directly adjoins the reversing stand (1). 4. The operating method as claimed in claim 1, 2 or 3, characterized in that at least for each roller table area (6) arranged on the exit side with reference to the respective conveying operation with reference to the reversing stand (1), the control device (4) controls the adjustment of the circumferential speed (vU) of the conveyor rollers (7) of the respective roller table area (6) to the entry speed (vE) in accordance with an acceleration profile that is individual for the respective roller table area (6), and in that the acceleration profile is determined in such a way that a control margin (TR) remains. 5. The operating method as claimed in one of the above claims, characterized in that at least for each roller table area (6) arranged on the entry side with reference to the respective conveying operation with reference to the reversing stand (1), the control device (4) individually calculates an exit time (TA) at which the rolling material (5) exits at the latest into the respective roller table area (6), and whose conveyor rollers (7) are driven in such a way that the circumferential speed (vU) is lowered to less than the exit speed (vA) at the earliest at the exit time (TA). 6. The operating method as claimed in claim 5, characterized in that the circumferential speed (vU) of the conveyor rollers (6) at least of the roller table area (6) arranged on the entry side with reference to the respective conveying operation with reference to the reversing stand (1), is lowered at the latest from the exit time (TA') for the roller table area (6) respectively directly adjacent in the direction of the reversing stand (1). 7. A data medium having a computer program (9), stored on the data medium, for carrying out an operating method as claimed in one of the above claims, when the computer program (9) is executed by a control device (4) for a reversing rolling mill. 8. A control device for a reversing rolling mill, which is designed, in particular programmed, in such a way that the reversing rolling mill can be driven by it in accordance with an operating method as claimed in one of claims 1 to 6. 9. A reversing rolling mill that has at least one reversing stand (1) for rolling a rolling material (5), two roller tables (2, 3), arranged on both sides of the reversing stand (1), for transporting the rolling material (5), and a control device (4) for controlling the reversing rolling mill, the roller tables (2, 3) respectively having a number of roller table areas (6) of which each has at least one conveyor roller (7) , it being possible to drive the: conveyor rollers (7) of each roller table area (6) independently of the conveyor rollers (7) of the other roller table area (6), the control device (4) being designed, in particular programmed, in such a way that the reversing rolling mill can be driven by it in accordance with an operating method as claimed in one of claims 1 to 6. 10. A rolling material, in particular strip-shaped rolling material, characterized in that it has been produced in accordance with an operating method as claimed in one of claims 1 to 6. The invention relates to a reverse rolling mill comprising at least one reversing stand (1) for rolling a rolled material (5), two roller tables (2,3) which are used for transporting the rolled material (5) and which are arranged on both sides of the reversing stand (1), and a control device (4) for controlling the reverse rolling mill. The roller tables (2,3) comprise several roller table areas (6) and each area comprises at least one conveyor roller (7). The conveyor rollers (7) of each roller table area (6) can be controlled independently from the conveyor rollers (7) of the other roller table areas (6). The rolled material (5) is conveyed in such a way that the front of the rolled material is displaced at an intake speed (vE) and the end of the rolled material is displaced at a delivery speed (vA). The control device (4) indivi dually calculates an earliest intake time point (TE), in relation to the reversing stand (1), at least for each roller table area (6) located on the delivery side with respect to the respective conveyor step, at which the rolled material is taken into the respective roller table area (6) and controls the conveyr rollers of said area (7) in such a way that the peripheral speed is matched to the intake speed (vE), at the latest, at the intake time point (TE). |
|---|
| Patent Number | 270763 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Indian Patent Application Number | 3570/KOLNP/2008 | |||||||||
| PG Journal Number | 04/2016 | |||||||||
| Publication Date | 22-Jan-2016 | |||||||||
| Grant Date | 18-Jan-2016 | |||||||||
| Date of Filing | 02-Sep-2008 | |||||||||
| Name of Patentee | SIEMENS AKTIENGESELLSCHAFT | |||||||||
| Applicant Address | WITTELSBACHERPLATZ 2, 80333 MUNCHEN | |||||||||
Inventors:
|
||||||||||
| PCT International Classification Number | B21B 39/12 | |||||||||
| PCT International Application Number | PCT/EP2007/051007 | |||||||||
| PCT International Filing date | 2007-02-02 | |||||||||
PCT Conventions:
|
||||||||||