Theoretical and Experimental Studies on the Technology of On-Line Roll Profile Measuring for Hot Strip Continuous Rolling Mill
|Course||Mechanical Design and Theory|
|Keywords||Roller type Online testing Eddy current Ultrasonic wave Error Separation Error compensation Straightness Dynamic zero reference|
Free rolling, improve production efficiency and flexibility of the mill; development of shape control technology to improve the quality of the plate shape is an important technical development direction of modern strip mill. Online work roll grinding roll (ORG) is based on the realization of the free rolling and improve the capacity of the mill shape control requires the development of a new technology. Detect to roll online repair grinding to the desired shape, roll type before and after the grinding roller, roller-line detection (OPM) technology came into being, and has been great development. The roller online detection means detected in the case of the normal operation of the mill, the shape of the surface of the roll. Hot-rolled, roll-type is an important condition for shape control. Real-time, accurate detection of the hot rolling mill roll roll type, in order to achieve accurate on-line grinding roll is free rolling of hot strip mill, the key to improve the product quality and mill performance. Therefore, in recent years, roller-line detection has become a key technology to improve the quality of the hot strip rolling mill Strip Shape. The introduction of Hot Rolling Mill of Baoshan Iron and Steel Company 1580 hot strip mill line roller device, but not at the same time the introduction of the supporting roller-line detection system. In this paper, the subject of the 1580 hot roller-line detection device developed relying on the hot roller-line detection system development, theoretical and experimental studies carried out on the roller-line detection technology. OPM installation location reserved 1580 hot rolling mill line roller device, developed a roller-line detection of radial motion and positioning device, the device can be installed eddy current ranging sensor can be installed ultrasonic ranging sensors. Compared with the the original OPM radial movement and positioning program, the apparatus also having before each measurement of each of the sensors, respectively, calibration, and each of the sensors can be adjusted to the measurement of the advantages of the optimum working position. Harsh environment of hot-rolled production site interference, high the roll measurement accuracy requirements in the domestic and foreign existing roller-line detection method were analyzed and compared on the basis of selected ultrasonic and eddy current the range finder roller-line detection way as the research object, for both roll detection principle analysis and experimental comparison, the final selection of the eddy current range finder roller line detection. Set up a roller-line detection system. The system uses a software system on the IPC to be controlled by the data transmission system before the measurement of radial movement and positioning systems, in order to achieve the sensor calibration before measurement and precise locking of the sensor reaches the optimum distance measuring closed-loop control; After starting the measurement can be collected automatically or trigger collected sensor data acquisition. Simple and analog conditions experimental system. Factors affecting the measurement accuracy in on the roller-line detection in analog conditions carried out a detailed experimental study to determine the impact of various factors on the test results. On the basis of a detailed analysis of the various factors that affect the measurement accuracy of the various factors affecting the study of the theory of error separation and compensation. On this basis, developed a roller-line detection strategies. In the theoretical study of a straightness error separation method. The method using a single distance measuring sensor such as the discrete sampling interval were measured Canted roll on the specific position of the two pixel lines, calculated by the model measuring the straightness error of the rail and roll Results pixel lines were separated. lt; WP = 5 GT; roll processing methods based on least squares circle method, the error separation and compensation based on dynamic zero reference and spectral analysis to improve the roller type in data processing, in addition to the online detection accuracy of the method the roller type, and after the processing of these two methods were analyzed and compared.