RU2020140208A - FREQUENCY-DEPENDENT DISTRIBUTION OF CONTROL VALUES FOR CHANGE OF RELATED CROSS-SECTION IN A ROLLING MILL - Google Patents

Claims (58)

1. Method of operating a rolling mill (1) for rolling rolled metal (2), - at the same time, the rolling mill (1) contains several rolling stands (3a-3f), through which the rolled metal (2) passes in turn in the transport direction (x) common for these rolling stands (3a-3f), so that the rolled metal (2) alternately rolled in rolling stands (3a-3f), - at the same time, the control device (4) of the rolling mill (1) on the basis of a certain value (δQ) characteristic of the change in the cross section with which the rolled metal (2) must exit a certain rolling stand (3e) of the rolling mill (1), determines for of this rolling stand (3e) and several preceding this rolling stand (3e), when viewed in the direction (x) of transport, rolling stands (3b-3d) of the rolling mill (1) first the corresponding preliminary control value (Sb-Se), and from using this respective preliminary control variable (Sb-Se) the respective final control variable (Sbʽ-Seʽ), - in this case, the corresponding final control value (Sbʽ-Seʽ) influences the cross-section with which the rolled product (2) leaves each rolling stand (3b-3e) of the rolling mill (1), - in this case, the control device (4) activates the rolling stands according to this final control value (Sbʽ-Seʽ), different in that - that the control device (4) determines the corresponding preliminary control variable (Sb-Sd) for the previous rolling stands (3b-3d) by appropriate frequency filtering of the specified characteristic value (δQ) or the corresponding intermediate value determined from the characteristic value (δQ) (Zb- Zd); - frequency filtering is implemented in such a way that the determination of the respective pre-control variable (Sb-Sd) for the previous rolling stands (3b-3d) always includes only the frequency components of the characteristic quantity (δQ) that lie below the respective cut-off frequency (fb-fd) , and - in relation to several previous ones, when viewed from a certain rolling stand (3e) in the transport direction (x), rolling stands (3b-3d) of the rolling mill (1) and viewed in the transport direction (x), cutoff frequency (fb-fd ) from one rolling stand (3b-3d) to another rolling stand (3b-3d) always remains constant or increases; - the control device (4) determines the preliminary control variable (Se) for a certain rolling stand (3e) in such a way that at least those frequency components of the characteristic quantity (δQ ) that lie above the cutoff frequency (fd) of the rolling stand (3d) immediately preceding the determined rolling stand (3e) as viewed in the transport direction (x). 2. Method of operation according to claim 1, different in that - that the control device (4) determines the preliminary control variable (Se) for a certain rolling stand (3e) of the rolling mill (1) on the basis of the indicated characteristic quantity (δQ), in particular by frequency filtering this characteristic quantity (δQ), - the control device (4) determines the preliminary control values (Sb-Sd) for the previous rolling stands (3b-3d) by frequency filtering the corresponding intermediate value (Zb-Zd), and - the control device (4) determines the appropriate intermediate value (Zb-Zd) on the basis of the final control value (Scʽ-Seʽ) always for the immediately following rolling stand (3c-3e) as viewed in the transport direction (x). 3. Method of operation according to claim 1 or 2, different in that - that the control device (4) determines the appropriate final control value (Scʽ-Seʽ) for each rolling stand (3c-3e) on the basis of the preliminary control value (Sc-Se) for each rolling stand (3c-3e) and the corresponding value (Scʽʽ -Seʽʽ) corrections, and - the control device (4) determines the appropriate correction value (Scʽʽ-Seʽʽ) based on the preliminary control value (Sb-Sd) of each immediately preceding rolling stand (3b-3d) as viewed in the transport direction (x). 4. Method of operation according to claim 3, different in that - that the control device (4) delays the corresponding correction value (Scʽʽ-Seʽʽ) by the corresponding delay time (Tc-Te) with respect to the preliminary control value (Sb-Sd) of the rolling stand (3b) immediately preceding, as viewed in the transport direction (x) -3d). 5. Method of operation according to any one of claims 1-4, different in that - that the control device (4) limits the final control values (Sbʽ-Seʽ) by means of an appropriate limiting element (18). 6. Control program, and this control program includes a program code (6), which can be processed by the control device (4) for a rolling mill (1) having several rolling stands (3a-3f), moreover, as a result of working out the program code ( 6) the control device (4) controls the rolling mill (1) in accordance with the operating method according to any one of claims 1 to 5. 7. A control device for a rolling mill (1) for rolling rolled metal (2) from metal, while the rolling mill (1) has several rolling stands (3a-3f), through which the rolled product (2) passes in turn in a single rolling stand for these rolling stands (3a-3f) direction (x) of transport, so that the rolled product (2) is alternately rolled in the rolling stands (3a-3f), - in this case, the control device has circuits (9b-9e) for determining, by means of which the control device, based on a certain value (δQ), characteristic of the change in the cross section with which the rolled product (2) should exit a certain rolling stand (3e) of the rolling mill ( 1), determines for this rolling stand and several preceding this rolling stand (3e), when viewed in the direction (x) of transport, the rolling stands (3b-3d) of the rolling mill (1), firstly the corresponding preliminary control value (Sb-Se) , and using this corresponding preliminary control variable (Sb-Se) the corresponding final control variable (Sbʽ-Seʽ), - in this case, the corresponding final control value (Sbʽ-Seʽ) influences the cross-section with which the rolled product (2) leaves each rolling stand (3b-3e) of the rolling mill (1), - in this case, the control device activates the rolling stands (3b-3e) according to the given final control value (Sbʽ-Seʽ), different in that - that the circuits (9b-9d) for determining the previous rolling stands (3b-3d) have frequency filters (11b-11d), by means of which the control device determines the appropriate preliminary control value (Sb-Sd) for the previous rolling stands (3b-3d) by the corresponding frequency filtering characteristic value (δQ) or determined from the characteristic value (δQ) of the corresponding intermediate value (Zb-Zd); - the frequency filters (11b-11d) are designed in such a way that only the frequency components of the characteristic quantity (δQ) that lie below the respective cut-off frequency are always included in the determination of the respective pre-control variable (Sb-Sd) for the preceding rolling stands (3b-3d) (fb-fd), and - in relation to several previous ones, when viewed from a certain rolling stand (3e) in the transport direction (x), rolling stands (3b-3d) of the rolling mill (1) and viewed in the transport direction (x), cutoff frequency (fb-fd ) from one rolling stand (3b-3d) to another rolling stand (3b-3d) always remains constant or increases, and - the circuit (9e) for determining for a certain rolling stand (3e) is designed in such a way that the determination of the preliminary control variable (Se) for a certain rolling stand (3e) includes at least those frequency components of the characteristic quantity (δQ) that lie above the limit frequency (fd) of the rolling stand (3d) immediately preceding, as seen in the direction of transport (x), the determined rolling stand (3e). 8. The control device according to claim 7, different in that - that the control device enters into the determination circuit (9e) for a particular rolling stand (3e) of the rolling mill (1) a characteristic value (δQ), - the control device enters in the determination circuits (9b-9d) for the previous rolling stands (3b-3d) the corresponding intermediate value (Zb-Zd), and - the control device has intermediate blocks (13c-13e), by means of which the control device determines for the previous rolling stands (3b-3d) the corresponding intermediate value (Zb-Zd) on the basis of the final control variable (Scʽ-Seʽ) always for the immediately following, if look in direction (x) of transport, rolling stand (3c-3e). 9. Control device according to claim 7 or 8, different in that that the determination circuits (9c-9e) have nodal points (14c-14e) at which the control unit determines the respective final control variable (Scʽ-Seʽ) by adding the corresponding preliminary control variable (Sc-Se) for each rolling stand (3c-3e ) and the corresponding value (Scʽʽ-Seʽʽ) of the correction, and - the control unit has bridge elements (15c-15e) by means of which the control unit determines the appropriate correction value (Scʽʽ-Seʽʽ) on the basis of the pre-adjustment value (Sb-Sd) always directly preceding, as viewed in the transport direction (x), the rolling stand (3b-3d). 10. The control device according to claim 9, different in that that the bridge elements (15c-15e) have delay links (17c-17e) by means of which the controller delays by the corresponding delay time (Tc-Te) the corresponding correction value Scʽʽ-Seʽʽ relative to the pre-adjustment value (Sb-Sd) of the immediately preceding one, if look in the direction (x) of the transport, rolling stand (3b-3d). 11. The control device according to any one of claims 7-10, different in that that the determination circuits (9b-9d) have a respective limiting element (18) by means of which the control device limits the respective final control variable (Sbʽ-Seʽ). 12. The control device according to one of claims 7-11, different in that that the control device is in the form of a control device with programmable software. 13. Flat rolling mill (2), - in this case, the rolling mill contains several rolling stands (3a-3f), through which the rolled metal (2) passes in turn in the transport direction (x) common for these rolling stands (3a-3f), so that the rolled metal (2) is alternately rolled in the rolling mills crates (3a-3f), - in this case, the rolling mill has a control device (4) that controls the rolling stands (3a-3f) of the rolling mill, different in that that the control device (4) is made in the form of a control device according to any one of claims 7-12.