scholarly journals Development of Digital Control Algorithms for the Mechatronics System Drives of Reversing Plate Mill Stands

2021 ◽  
Vol 21 (1) ◽  
pp. 122-140
Keyword(s):  
Control System ◽  
Position Control ◽  
Control Channel ◽  
Control Algorithms ◽  
Plate Mill ◽  
Thickness Control ◽  
Automatic Gauge Control ◽  
Gap Control ◽  
Mill Stand ◽  
Roll Gap

Expanding the plate mill product range implies the improvement of control algorithms for the mechatronics control system drives of the reversing stands. The most important objectives include increasing the accuracy of geometric dimensioning and tolerancing, as well as improving the profile and surface flatness of rolled pro­ducts. The structure explaining the automatic ROLL-GAP CONTROL concept is provided, which allows controlling the thickness and gap between SMS-Demag AG rolls. This concept is implemented in the '5000' mill stand of Magnitogorsk Iron and Steel Works. The structural diagram of the automatic gauge control system (AGS) is presented. The functional diagram of the hydraulic gap control (HGC) system is presented, which includes a fast proportional control channel and a relatively slow integral position control channel. The principle of automatic thickness control is discussed, implemented in the automatic gauge control (AGC) system of the mill stand TCS controller. The diagram and dependences are prepared for the calculation of the nonlinear thickness controller parameters. The functions of the RAC regulator are described, intended for compensation of the tensile difference (gap spacing) at the mill stand sides. The dynamic impact compensation system functions are considered. The removal of the roll bending and deformation control signals is substantiated. The disadvantages of AGC are noted for sheets with a thickness below 10 mm. The most dangerous case is the tearing of metal fragments from the rear sheet side caused by the incorrect operation of the gauge control system. A method for hydraulic gap control is proposed based on the fast increase of the roll gap in the rear part of the rolled sheet during the last passage when rolling thin sheets. The results of experimental studies made on the '5000' mill are presented. The efficiency of the proposed control method has been confirmed. The oscillograms of signals are presented characterizing thickness variations. HGC and AGC systems with the proposed adjustments are proven to provide high-accuracy hydraulic position control and thickness control along the sheet length and width.

Improvement of Work Roll Bending Control System Installed at Plate Mill Stand

2017 ◽  
Author(s):  
Vadim R. Gasyarov ◽  
Andrey A. Radionov ◽  
Boris M. Loginov ◽  
Stanislav S. Voronin ◽  
Vadim R. Khramshin
Keyword(s):  
Control System ◽  
Work Roll ◽  
Plate Mill ◽  
Roll Bending ◽  
Mill Stand

Roll-Gap Control System of Twin Roll Strip Caster Based on Feed Forward-Feedback

2013 ◽  
Vol 750 ◽  
pp. 64-67
Author(s):  
Wen Yu Zhang ◽  
Dong Ying Ju ◽  
Yao Yao ◽  
Hong Yang Zhao ◽  
Xiao Dong Hu ◽  
...  
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Feedback System ◽  
Experimental Results ◽  
Convergence Time ◽  
Feed Forward ◽  
Gap Control ◽  
Roll Gap ◽  
Twin Roll

In this paper, the established control system and its control algorism of a new twin roll strip caster developed by authors is presented. It is illustrated the roll-gap control strategy of the twin roll strip caster based on a feed forward-feedback system. From the experimental results, the susceptibility of control convergence time, stable and accurate are shown on a higher level than traditional control strategy.

scholarly journals Điều khiển thích nghi vị trí trên cơ sở kỹ thuật vi xử lý Phần I: Hệ thống điều chỉnh vị trí nhờ quan sát và phản hồi trạng thái

2018 ◽  
Vol 5 (4) ◽  
pp. 10-16
Author(s):  
Pham Huy Thoa
Keyword(s):  
Control System ◽  
Feedback Control ◽  
Control Problem ◽  
Control Algorithm ◽  
Position Control ◽  
The State ◽  
Control Algorithms ◽  
State Variable ◽  
Load Characteristics ◽  
Positional Control

  In order to investigate different position control algorithms for numerical controlled machines and robots, a positional control system was built on the base of  a microcomputer. In part I, the paper presents the  observer algorithm for  state variable estimation and the state variable feedback control algorithm applied to the position control of a  particular machine-table. With the hardware and software structure of the microcomputer based digital system described in this paper different control algorithms can be  realized flexibly. The position control problem for the plant with variations or  uncertainties of  parameters and load characteristics will be reported in part II.

The Design and Implementation of Intelligent Distributed Computer Monitor-Control System for Full Hydraulic Plate Leveler

2012 ◽  
Vol 572 ◽  
pp. 312-316
Author(s):  
Hu Ying ◽  
Xiao Hong Hao ◽  
Qing Xue Huang ◽  
Deng Yue Zang ◽  
Jiang Tao Sun
Keyword(s):  
Control System ◽  
Position Control ◽  
Frequency Converter ◽  
Computer Control ◽  
Third Generation ◽  
Design And Implementation ◽  
Control Frequency ◽  
University Of Technology ◽  
Roll Gap ◽  
Multiple Field

This paper describes the distributed control system design and implementation of third-generation leveler. The system is based on multiple field-buses, and consisted of many distributed computer control system, such as automation station, main operating station, monitoring station, engineers stations and so on. Through PLC control frequency converter, the system has realized the speed of transmission motor and tension control. And through the hydraulic position control loop, the system has realized the roll gap setting and maintained constant pressure. Because of this, in the head and tail, the steel have gained well straightening quality. The plate factory of a steel company used the four-fold hydraulic reversible 11 rolls leveler that is developed by the Taiyuan University of Technology. Through the practice proved, the control system is running well and meeting the control requirement of third-generation leveler.

scholarly journals Improving the Control Accuracy of the Strip Plate During Shaped Rolling Using Electric and Hydraulic Drives

2019 ◽  
pp. 43-53
Author(s):  
Vadim R. Gasiyarov ◽  
Boris M. Loginov ◽  
Stanislav S. Voronin
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Plate Thickness ◽  
Response Speed ◽  
Automatic Process Control System ◽  
Plate Mill ◽  
Thickness Control ◽  
Technological Advantage ◽  
Strip Plate

It is important to reduce the amount of metal waste caused by scrap edge and scrap ends in the process of rolling at plate rolling mills. The influence of the correlation of the elongation ratio during drawing and spreading on the geometric shape of the strip plate was estimated. The paper shows the advantages of rolling process forming a double-cone profile at the head and tail sections. The ASC technology was introduced, which makes use of the multipoint strategy of thickness setting along the strip plate length. The importance of improving the accuracy of automatic control of position of screw-down structures and thickness was established when this strategy is used. The paper shows the structure and characteristics of the thickness automatic control system of the plate mill 5000. The analysis of oscillograph records of the strip plate thickness was carried out during the shaping pass for the current settings of the thickness automatic control system. Some deviations were recorded, which were caused by the lag of the regulating signal with respect to the actual deviation of thickness during displacement of the screw-down structures. To improve the response speed of the thickness automatic control system and to reduce the dynamic lag, a method of thickness control with pre-control was offered. The research group considered the double-circuit thickness automatic control system with the feed forward control of the target signal and established the transfer function of the pre-control channel. The paper demonstrated the structure of the simulation model of interrelated electric systems of a reverse rolling stand providing the opportunity of the joint research of shaped rolling and forming of a bend at the head end of the strip plate. The circuits of individual blocks of the model were considered. Comparative analysis of time curves of the strip plate thickness was carried out for the implementation of the design and the developed control algorithms and the increase in the response speed of the thickness automatic control system was proved. The paper demonstrates the oscillograph records obtained during the implementation of the developed algorithm in the automatic process control system of the reverse stand of the plate mill 5000. As a result of their comparison with the oscillograph records of the designed settings of the thickness automatic control system, it was proved that the accuracy of the thickness control improved. The paper notes that the main technological advantage of implementation of the developed algorithm is improving of the final product quality.

scholarly journals Stability Analysis of Roll Gap Control System on Rolling Mill in Non-Rolling State.

2000 ◽  
Vol 66 (643) ◽  
pp. 759-764
Author(s):  
Yasunobu HAYAMA ◽  
Jyunichi NISHIZAKI ◽  
Yohji TERAMOTO ◽  
Akira MOHRI
Keyword(s):  
Control System ◽  
Stability Analysis ◽  
Rolling Mill ◽  
Gap Control ◽  
Roll Gap
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