The best cold rolling machine must have the best control system. As the core equipment for metal processing, the control system of a cold rolling machine mainly covers the following key aspects:
Thickness control (AGC system)
Automatic thickness control is achieved through hydraulic roll gap adjustment, including feedforward AGC (to cope with inlet thickness fluctuations), monitoring AGC (feedback from the exit thickness gauge), and second-flow AGC (based on the principle of metal volume conservation).
Modern systems use laser thickness gauges with an accuracy of ±0.005 millimeters and integrate functions such as roll bending force compensation and roll eccentricity compensation.
Tension control
The unwinding machine and the winding machine need to maintain constant tension, which is divided into indirect torque control (without sensors) and direct closed-loop control (feedback from the tension sensor).
The dynamic tension compensation mechanism ensures the stability of the rolled material during the rolling process and avoids slipping or breakage.
Plate shape control
The work rolls, cross-rolls, and segmented cooling mechanisms are coordinated to adjust the lateral thickness difference and straightness of the rolled material.
High-precision plate shape control requires the combination of multi-variable optimization algorithms to meet the demands of high-end products such as automotive plates and electrical steel.
Speed and load balance
The synchronous control of the upper and lower rolls of the main rolling machine adopts dynamic load balance adjustment to prevent overload of a single roll.
The AC variable frequency drive system replaces DC motors to improve dynamic response and maintenance convenience.
Safety and process parameter management
Strictly set rolling parameters (such as reduction amount, feeding method), prohibit running with faults, and record production data.
The interlocking control of auxiliary equipment such as the hydraulic station and lubrication station is realized by PLC to ensure system stability.
Intelligent upgrade
Integrate PLC, HMI, and upper computer monitoring, reduce interference through PROFIBUS bus, and achieve data traceability.
Future trends will integrate Internet of Things and AI technologies to further optimize the control model. The synergy of these control systems ensures that the cold rolling machine can operate efficiently while meeting the requirements of high precision and high quality products.
