Key Technologies of AGC System

The hydraulic AGC system not only improves production efficiency and reduces material waste, but also adapts to the needs of different production processes, improving product consistency and reliability. In the manufacturing fields of steel, aluminum, coatings, etc., hydraulic AGC systems provide technical support for achieving high-precision and high-quality products, promoting the intelligent and high-quality development of the industry.

Key Technology of AGC System: Closed-Loop Control of Strip Thickness

The closed-loop control of strip thickness is the core technology of hydraulic automatic gauge control system, which includes multiple control methods such as monitoring AGC, tension control system, second flow AGC, and pre control AGC.

The monitoring automatic gauge control system measures the actual thickness of the strip steel in real time through a thickness gauge installed at the exit of the rolling mill, and compares the measured value with the target thickness. When a thickness deviation is detected, the controller adjusts the roll gap of the rolling mill according to the magnitude and direction of the deviation to correct the thickness deviation. This control method can monitor and adjust the thickness fluctuations in real-time during the rolling process, ensuring the stability of the strip thickness.

The tension control system utilizes the tension changes of the strip steel during the rolling process to control the thickness. When the tension of the strip steel changes, it will cause a change in the thickness of the strip steel. By adjusting the tension devices before and after the rolling mill, the tension of the strip steel can be changed, thereby indirectly controlling the thickness of the strip steel. For example, when the tension of the strip steel increases, it will be stretched and thinned. At this time, by reducing the tension, the thickness of the strip steel can be restored to the target value.

The second flow automatic gauge control system is based on the principle of equal second flow, which means that the volume of strip steel passing through the rolling mill remains constant per unit time. Calculate the second flow rate of the strip steel by measuring its inlet velocity, thickness, and outlet velocity. When the second flow rate changes, it indicates that there may be a deviation in the thickness of the strip steel. The controller adjusts the roll gap to ensure a constant second flow rate, thereby achieving control over the thickness of the strip steel.

Pre control automatic gauge control system is based on parameters such as thickness and speed of the steel strip before entering the rolling mill, predicting the thickness changes of the steel strip during the rolling process in advance, and adjusting the roll gap before the steel strip enters the rolling mill. This control method can compensate for possible thickness deviations in advance, improving the accuracy and response speed of thickness control.

Key Technology of AGC System: Synchronous Control of Pressing/Lifting on Both Sides of the Rolling Mill

It is very important to ensure that the pressure and lifting amount on both sides of the rolling mill are synchronized during the process of strip steel rolling. If the pressure or lifting amount on both sides is not consistent, it will cause uneven thickness on both sides of the strip steel and result in plate shape defects. The hydraulic automatic gauge control system achieves precise synchronous control of the hydraulic actuators on both sides of the rolling mill through advanced synchronous control technology.

The automatic gauge control system adopts high-precision pressure sensors and displacement sensors to monitor the pressure and position on both sides of the rolling mill in real time. The controller independently controls the hydraulic actuators on both sides through precise algorithms based on the collected data, ensuring that the pressure and lifting amount on both sides remain consistent. Even if there are fluctuations in rolling force or other interference factors during the rolling process, synchronous control technology can quickly adjust to ensure uniform thickness on both sides of the strip steel and improve the quality of the strip steel shape.

The hydraulic automatic gauge control system achieves efficient and precise control of strip thickness through the basic working principle of closed-loop control, as well as key technologies such as closed-loop control of roll gap position, closed-loop control of strip thickness, and synchronous control of pressure/lift on both sides of the rolling mill. The continuous development and improvement of these technologies will drive the steel strip rolling industry towards higher quality and efficiency.