Cold Rolling Mills

Gauge & Shape Control Systems

Hydraulic Automatic Gauge Control

Magadh can supply a computerized Hydraulic Automatic Gauge Control (HAGC) system, which provides quick and accurate screw-down control to maintain close strip tolerances necessary to meet stringent market demands. The roll force cylinders are made from solid forged and heat-treated alloy steel blocks, precision machined, and fitted with special hydraulic seals capable of continuous high-pressure duty and quick response. They are equipped with absolute position transducers from SONY Magnascale or equivalent brands for precision position feedback.

Shape Control System

Magadh offers a shape control system for automatic flatness control, aimed at achieving uniform stress distribution within the flatness tolerance range of rolled strips.

The flatness measuring roll is installed as a measuring transducer on the mill, registering all strip tension variations across the strip width and comparing them with the tension stress reference curve. The pressure transducers are arranged in a staggered manner over the roll surface, connected in groups, and fed to a charge amplifier that converts the electric charge into proportional voltages. The optical signals are transferred to the acquisition CPU of the flatness control computer via an optical transmitter.

Elements of Flatness Control are:

  • Shifting of Rolls
  • Tilting of rolls
  • Work Roll Bending
  • Intermediate Roll Bending
  • Roll Cooling (Zonal)
  • Crown Control

Advantages of Flatness Control are:

  • Reduction in strip cracks and breakage
  • Improvement in strip shape by uniform tensile stress over strip width
  • Increase in mill efficiency
  • Reduced dependency on mill operator's skill