Nav Bharat Engineering Works

Bulandshahr Road Industrial Area, Ghaziabad, Uttar Pradesh

The Crank Shear is placed between the Roughing train & the Intermediate train.

To cut front/back end & Cobble cutting of the square at a temperature of 900 deg C and above.

• The casing is prestressed to prevent seperating of casing parting surfaces on load during the milli seconds when the cut is executed.
• The cutter ends protrude, so as to have increased blade grinding margin.
• We provide two nos. Flywheels with mechanical clutch. The additional flywheel has to be engaged for cutting heavier section. The flywheel inertia augments the power available for cutting from constant torque motor.
• The casing front face is water cooled to avoid distortion with heating from moving rolled stock.
• The gears are case carburised hardened & ground designed for minimum back lash. Again the gears and knife holders are designed for required intertia.

The square shaped cobble cutting is saleable material to be rolled in scrap rolling mills.

The Disc & Drum Shear is placed between the Roughing and intermediate Mill.

• To Cut the front and back end of the squares upto 32 mm at 900o C
• In case of misroll at the Intermediate or Finishing Mill the deviator pipe is shifted directing the bar to the Drum Shear which cuts It into scrap pieces

In the mills the Snap Shears are mounted on repeaters to cut the bar in case of misroll, but the bar which is coming from the Roughing Mill is continuously fed into the mill is getting entangled on the roll. This feeding of the bar is stopped by cutting at the Drum Shear, thereby drastically reducing the down time of the mill in case of misroll.

• Both Disc & Drum Shear are with case carburised, hardened & ground gears, (almost eliminating teeth wear) with near zero backlash.
• The cut pieces at the Drum Shear are collected in a tray placed under the silo, keeping the surrounding clear and enabling easy removal

• The Start Stop Flying Shear can cut upto 18m/s with the standard DC motors. The solution lies in installing High Speed Continuous Rotating Shear with regenerative Tail Breaking Pinch rolls. The speeds of 22m/s with pneumatic deviator & 30 m/s with servo motor deviator have been achieved.
• The first cut of this shear is not accurate, but the subsequent cuts are very accurate. The material loss of first cut is compensated by the subsequent cuts.
• The motor power is only 50 KW, compared to 90, 130, 175 KW of Start Stop Flying Shear.

8mm to 16mm TMT bar. Single Shear is sufficient for ingot rolling mills.

To cut set lenth of TMT bar being rolled above 20m/s at a temperature of 550 deg C

• The casing is vertically split to take the separating force during the the milli seconds when the cut is executed on the casing profiles instead of parting bolts.
• The blade holder is fitted with double cone torque couplings as a safeguard against the accidental overload.
• The Flywheels are provided to reduce the motor power. The flywheel intertia augments the cyclic cutting load.
• The gears are case carburised hardened & ground designed for minimum back lash.