Tension Control in Hot Rolling Mills _(BTC,TLC and MTC)

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BTC - Biting Tension Control
TLC - Tail Loop Control
MTC - Minimum Tension Control
AGC - Automatic Gauge Control
APC - Automatic Profile Control
AWC - Automatic Width Control
ASC - Automatic Shap Control

In rolling mills,
tension control, often achieved through techniques like looper control and bridle rolls, is crucial for maintaining strip quality and preventing issues like necking or strip breaks. This control ensures that the strip experiences a specific, desirable level of tension between the rolling stands.

#Here's a more detailed explanation:

1. Looper Control:-

Purpose:

Looper systems, installed between rolling stands, help maintain a desired tension level by adjusting the strip's loop (slack or excess length).)
Mechanism:

A hollow idler roll, pivoted by a hydraulic actuator, is used to create and regulate the loop. Excessive tension can lead to strip necking and eventual breakage, while too little tension can cause folds.

Control:

The looper angle is adjusted to maintain a constant tension between the stands, regardless of the strip stock.

2. Bridle Rolls:

Purpose:

Bridle rolls, also known as bridle drives, are used to manipulate strip tension by applying either back tension (pulling back) or front tension (pulling forward).

Mechanism:

These rolls are powered by electric motors/generators and can be configured to either increase or decrease strip tension.

Control:

By adjusting the speed and torque of the bridle rolls, the tension in the strip can be finely controlled, affecting the rolling process and the final product.


3. Tension Control in Multi-Stand Mills:

Techniques:

Multi-stand rolling mills often use a combination of techniques like stand speed adjustments and roll gap control to manage tension.

Threading:

During the threading process (when the strip is being fed into the mill), tension is typically controlled by adjusting the speed of individual stands.

Transition:

Once the strip is fully threaded, the control system shifts to roll gap control, ensuring accurate strip thickness and desired reduction patterns.

4. Importance of Tension Control:

Strip Quality:

Proper tension control is essential for achieving consistent strip thickness, flatness, and other desired quality characteristics.

Preventing Defects:

Too much tension can lead to necking and breakage, while too little can cause folds and other defects.

Efficiency:

Proper tension control helps optimize the rolling process, leading to increased efficiency and reduced downtime.

5. Advanced Tension Control Systems:

HiTension:

Innovative systems like HiTension utilize eddy-current section sensors to measure strip thickness between stands, enabling accurate tension control and potentially eliminating the need for loopers.

Adaptive Controllers:

Adaptive control algorithms can dynamically adjust control parameters to compensate for uncertainties and disturbances, improving control precision and robustness.