The calender stack is a series of solid rolls, usually steel or cast iron, mounted horizontally and stacked vertically (Fig. ).During machine calendering, the dry paper passes between the rolls under pressure, thereby improving the surface smoothness (for example, from imperfections caused by felt marks, cockle, lumps, fibrils, etc.) and gloss and making the caliper more uniform, if not ...
Backup Roll Wipers, Upper Work Roll Air Wipers Cold Reversing Mill 3. 4 Line Features: Exit Shear, XRay Gauges, Air Knives for strip drying, Semi Automatic Coil Banding System, Coil ... Auxiliary hydraulic power unit Reservoir Capacity 2,500 liter ... Cold RolllingMill: PassLine Control 27. 28
In order to improve the control performance of strip rolling mill, theoretical model of the hydraulic gap control (HGC) system was established. HGC system offline identification scheme was designed for a tandem cold strip mill, the system model parameters were identified by ARX model, and the identified model was verified. Taking the offline identified parameters as the initial values, online ...
RealTime HIL Closed Loop System of Rolling Mill's ElectroHydraulic Gap Adjustment. A. Kovari. Engineering. 2010. Hardwareintheloop (HIL) test is a good ground for examine the dynamic model of rolling to observe the movement of the mill and monitor dynamic behavior of the hydraulic system and the mill... Expand.
the gauge control concept ROLLGAP CONTROL developed by SMS Demag AG. This concept was considered in the publications [1619] and fully implemented at the mill. The roll gauge and gap control principles are shown in the functional diagram, see Figure3. It consists of the following basic systems (modules) [1]: hydraulic gap control (HGC);
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The roll gap can also be preadjusted with the powerassisted valve 14 through roll gap measuring units. The hydraulic adjusting arrangement according to the present invention can be used in all types of known rolling mill stands. The adjusting cylinders 2, 2' can be arranged in the housing either at the top or the bottom.
ISIJ International, Vol. P*.~: nominal pressure Ap: pressure drop across the valve I: current supplied to the solenoid by the amplifier I***: maximumsolenoid current. Pipe Line Transmission delay of hydraulic oil in the pipe line is very small and henceneglected. Cylinder It converts flow into corresponding pressure andforce. The total volume of oil delivered to the piston is the ...
Qualitative comparisons showed that the model predicts and describes the fundamental modal behavior of a roll mill stand when compared with limited experimental data found in the literature. The simulation results show that cold rolling mills with hydraulic drives and inner loop roll gap control can have position response times of 50 to 200 ...
6. the control method of a kind of rolling mill hydraulic AGC system according to claim 4, it is characterized in that: at the preceding execution precompressed of step (1) pattern piece, the single closed loop control method of ring was measured the roll gap offset of milling train so that the elastic deformation compensation to be provided in ...
The simulation and field test results of the step response and the position tracking that is carried out on the HGC system of a cold rolling mill show that the selftuning fuzzy PID system has the characteristics of fast response, short rise time, no lag, small overshoot, and strong antiinterference ability. A closedloop control system for the hydraulic gap control (HGC) that is driven by ...
Piezoelectric roll gap control. The roll gap controller is based on the combination of a modelpredictive controller (MPC) and an inner proportionalintegral (PI) position control loop, shown in Fig. 5. Both controllers run with a time step of 1 ms, which is limited by the computation time of the roll gap model (see Section 5). In that current ...
As an alternative to the tworoll piercing mill, threeroll piercing mills are also used for the piercing process. This further improves the wall thickness quality of the hollow. SMS group has continuously further developed the crossroll piercing process with several inventions, such as hydraulic gap control.
Hot rolling mill hydraulic gap control (HGC) thickness control improvement Article Fulltext available Jan 2015 Peter Kucsera Z. Béres In this article the AGC (Automated Gauge Control)...
Length measuring and roll gap control have become easy and reliable thanks to the highresolution, very fast and accurate absolute position values received from our robust encoders. The Leine Linde highquality linear encoders withstands shock, extreme heat, dirt, magnetic fields, chemicals and vibrations. All Leine Linde linear encoders are ...
Machinery Business. Kobe Steel, Ltd. TEL:+. We, Kobe Steel, Ltd., have supplied many aluminum and nonferrous rolling mills since 1965. We can meet your expectations and provide the best solution of the rolling mill technologies based on a plenty of our results and experiences.
Today's Mills 5000 produce flat products of up to 5 m in width; the operation of these units shows 'camber' defects and axial shift of the roll at the stand exit point.
DOI: /JIFS169183 Corpus ID: ; Hydraulic gap control of rolling mill based on selftuning fuzzy PID article{Zhang2016HydraulicGC, title={Hydraulic gap control of rolling mill based on selftuning fuzzy PID}, author={Fei Zhang and Shengyue Zong and Xiaozhan Li and Handan Chen}, journal={J. Intell.
Fig 1 Thickness control in a single stand cold reversing mill. For the single stand cold reversing mill, the external controllers are (i) the tension control by torque (TCT) in which the entry / exit tensions are kept constant through the torque regulated by the TC that, in turn, exploits the motors applied to the coiler / uncoiler reels, (ii) the gauge control, feedback via gap (GBG) in ...
It requires minimal maintenance and is designed for ambient conditions in rolling mills. It compensates for differences in the rolled material's thickness with high dynamics, even at high rolling speeds. Rota Teknik has demonstrated its capabilities in industrial applications with its Hydraulic Roll Gap Control (GAP Control).
SMS group ranks among the leading suppliers of plant technology and equipment for the production of highquality stainless steel strip. Our portfolio of cold rolling mills for stainless steel comprises standalone 20high mills in MonoBlock and SplitBlockdesign as well as our 18HS stands which are also suited for integration and use in continuous mills.
This paper proposes a new flexible and microscale roll gap control technology to obtain a stronger strip flatness control ability. According to the principle of microscale roll gap control technology, an electromagnetic control rolling mill with the function of roll profile control and large diameter ratio rolling is designed and built. To analyze the flatness control ability, a comprehensive ...
The rolling mill vibration is characterized by the coupling effects among mechanical, electrical, hydraulic and interfacial subsystems. The influence of the mill modulus control gain in automatic gauge control on the vibration in hot rolling mills was investigated. Firstly, an experiment related to the mill modulus control gain was carried out in the hot rolling mill process, and it was found ...
They basically are controlling the roll gap which defines the thickness of the rolled material, so it is crucial to have a very accurate and reliable position measurement." Martinis continues, "Originally, we were using either two or four incremental position transducers for the main cylinders of the rolling mill to control the roll gap.
A Simulink and mathematical models have been proposed in this study in order to control the thickness in a rolling mill process. The simulation results show that the thickness oscillation can be manipulated with high accuracy by using NARMAL2, since it can remove the nonlinearity of servo system and other disturbances complexities. The proposed NARMAL2 controller model has been compared ...
down system is used for roll gap control. This mill is not only meets the needs of the rolling line adjustment when different work roll system changes, but also ensure the function need of APC and AGC during the rolling process. The main structure of mill is shown in Fig. 2. Hydraulic system includes hydraulic tension system at the front and ...
roll bite and in a typical Cold Tandem Mill, work roll temperatures normally fall in the range of 55oC 70oC with strip recoil temperatures and interstand strip temperature rarely exceeding 160 oC depending on product. Roll Bite temperatures in slower heavily drafted stands can peak in the region of 300oC, diminishing with the reducing ...
The looper control of hot strip finishing mill is one of the most critical control items in hot strip rolling mill process. It is a highly complex nonlinear system, with strong states coupling and uncertainty that present a difficult control challenge. Loopers are placed between finishing mill stands not only to control the mass flow of the two stands but also to generate a constant specific ...
Fig 1 Structure of a typical automation system for hot strip mill process. Level 0 It is the lowest level of control and includes, for example, the control loops for hydraulic capsules used to position the rolls in the rolling mills and for the main electric motors powering the mill.. Level 1 It is primarily concerned with inpiece control. At this level, the quality parameters such as ...
the roll gap, or the roll bite) between the work rolls. In this region the metal is plastically deformed, and there is slipping between the strip and the work roll surface. The necessary compression force is applied by hydraulic rams, or in many older mills by a screw arrangement driven by an electric motor [6]. Figure 1.
In order to meet the warm rolling demand and deal with the inefficiency of coldrolled deformation metals such as highstrength steel, silicon steel and magnesiumnickel alloy, etc.,
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