| Specifications
TYPE (VERTICAL OR HORIZONTAL) :
Actuated by pneumo hydraulic or fully hydraulic system.
STANDARD RATING :
Pneumo Hydraulic : 15, 30 and 45 KVA.
Hydraulic : 15, 30, 45, 75, 100, 150, 200 and 300 KVA.
WORKABLE MATERIALS :
Low, medium and high carbon steels, special alloy, stainless steel,
non-ferrous metals such as copper, brass, bronze, etc.
UPSETTING FORCES :
The work piece is firmly gripped in pneumatically / hydraulically
operated sliding contact dies. One end of the rod rests on the upset
slide operated from a pneumatic / hydraulic cylinder; the top end
of the rod, which is to be upset rests against an anvil whose movement
is controlled by an adjustable hydraulic flow control valve. The
Transformer output is connected between the clamping dies and the
anvil. On application of the ram pressure and high amperage current,
the length of the work piece between the clamping dies and anvil
heats up and gathers. Simultaneously, the rod is slowly pushed through
the clamping dies and the anvil is retracted gradually until the
required shape of bulb is formed.
SEMI-AUTOMATIC OPERATION :
Apart from manual loading and unloading of the work pieces, all
machine operations are carried out automatically.
CONSTRUCTION :
The main frame of this machine is of heavy, rigidly reinforced welded
steel plate construction. It combines a compact, streamlined appearance
with maximum resistance to mechanical deflection. The frame will
support the transformer, gathering cylinder with adjustable ram,
hydraulically controlled retracting anvil assembly and contract
clamps, all these features being generally as detailed below.
TRANSFORMER :
Heating current will be supplied by a continuously rated transformer
contained within the main frame of the machine. The transformer
is of a special type conforming to I.S.-4804, Part-I, 1968. Water
cooled, having core of high grade electrical steel, primary and
secondary coils of solid electrolytic copper of ample section, heavy
duty class 'F' insulted and impregnated suitably for withstanding
continuously a temperature of 140oC.
CURRENT CONTROL BY TRANSFORMER TAPS :
Current control provided by means of Taps on the primary winding
between 25% and 100% in steps.
In the hydraulic version, fully solid state Thyristor Contractor
system provided facilitates for stepless regulation of current output
continuously over its full range.
GATHERING CYLINDER :
Upsetting pressure will be provided from a double acting Air/Hydraulic
cylinder, mounted on the machine, and coupled to a slide mounted
on which will be provided a replaceable cup locator to locate and
support the free end of the stock prior to and during the up-setting
sequence.
Screw adjustment will be provided on the coupling between the operating
piston and the saddle unit to cover for a wide range of component
lengths. Upset pressures will be applied automatically at the correct
point in the operating sequence, and will be removed when an adjustable
dog operates a limit switch. The length loss can be adjusted by
adjusting the position of the limit switch dog.
CONTACT CLAMPS :
These clamps are arranged to engage on the diameter of the bar to
complete the heating current circuit and will be an air/hydraulically
operated assembly fitted with one set of replaceable clamp inserts.
The clamp assembly provides initial support to the incoming bar
blank and thereafter retracts to free the heated blank for transfer
away from the machine.
ANVIL ASSEMBLY :
The unit comprises of a slide mounted in line with the contact clamps,
and supporting a water cooled electrode holder which will be fitted
with a replaceable anvil pad. The complete sub-assembly is arranged
to retract along the slideway during the upsetting sequence at 3
retraction rate controlled by a closed circuit hydraulic system
incorporating a variable orifice flow control valve. On completion
of the upsetting sequence the head will be returned to its start
position by pressing a reset push button.
AIR/HYDRAULIC CONTROL :
The machine will be supplied complete with all the necessary air/hydraulic
control equipment, including air line filter, lubricator, gauges,
pressure regulator, heat exchanger, pump motor, control valves,
etc.
WATER FLOW SWITCH :
Can be supplied as optional for Machine and thyrister controls.
Service Requirements
(TO BE PROVIDED BY THE CUSTOMER)
POWER SUPPLY :
415 Volts, Single Phase, 50 Cycles, Machine is suitable for connection
to 2 lines of a 3 phase supply. Main supply cable 2 core type. Disconnect
switch with fuses of size recommended to be provided by the customer.
For hydraulic power pack 415 V, 3 phase supply should be available.
COMPRESSED AIR (For pneumo-hydraulic Machine
:
Air supply of recommended flow volume at a minimum pressure of 5.6
kg/cm2 (80 p.s.i.).
COOLING WATER :
Cooling water at 2.1 kg/cm2 pressure and temperature below 30oC
at recommended flow rate.
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