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MAIN
FRAMES : The frame is welded plate construction and the design
layout is such that most of the stress comes on rigid frame
members and weldments are subjected to only very low stress
level. All mating parts are machined after welding and
finishing, resulting into a very low distortion level.
BOTTOM ROLLS : Bottom Rolls re of forged EN-8 alloy steel. The
end journals of these rolls are supported in high quality
bronze bushes with thrust collars. They move up and down
diagonally through independent screws by Worm & Worm gears
arrangement. Two Dog Cutches are provided which can be
uncoupled & bottom rolls tilted when conical rolling is to
be done.
TOP ROLL & SWING ARM : Top Roll is machined from forged
EN-8 alloy steel. Both end journals are supported in high
quality bronze bushes with thrust collars.
The trunion (Non-driving) end of the roll is held in place by
a swing arm. It is motorised and swung out for removal of
finished shell. During this the bearing remains on the roll,
preventing foreign particles from falling on the finished load
bearing surface. The top roll remains counter balanced by
shaft extension on the headstock.
MAIN DRIVE : Main Drive is through an electric motor of ample
capacity. This motor drives a heavy duty worm reduction Gear
Box which in turn is coupled to a distribution gear box with
two output shafts. These shafts carry the flexible cardan
joints. Similar cardan joints are provided on the ends of the
two bottom rolls and these joints are coupled by the Carrdan
Shafts which transmit power to these rolls. These cardan
shafts are provided with eight bronze wear pads on all
sliding surface giving a long trouble free lift.
BRAKE : An electromagnetic
brake is fitted to stop the machine at any desired position
without the risk of overrunning.
LUBRICATION : Motorised Centralised lubrication is provided
for all the bronze bushes of the rolls except the swing arm
opening side. Main gear box is in oil bath. Wherever
centralised is not possible, oil cups are provided.
CONTROL PANEL : All the contractors and switchgears are of
reputed manufacturers like Siemens or L & T and the
circuit is provided with necessary interlock arrangements,
overtravel limit switches, fuses isolater, overload protectors
and safety devices.
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