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Straightening : In this
process wire passes through the
Spinners of the machine and get
straightened, the straightened
wires are automatically cut in
to pieces by means of cutting
die provided in the machine.
Grinding
and pin cutting : The
straightened wires are then
ground in the Centre less
Grinding machines. In this stage
bundles of straightened wires
are loaded on to the feeding
hopper and wire passes through
the Saddle and rubberized pulley
and ground automatically to the
desired length. Then the ground
wires are loaded on to the
hopper of Pin cutting machine.
In this machine ground wires are cut to the specified
length.
Hardening
: Pins are generally
hardened in automatic Hardening
Furnace. We have two
Electrically Heated, Oil quench,
Shaker Hearth Furnace. In this
type of Furnace, pins are
passing through heating zone of
the furnace by means of to and
fro movement of the Hearth
Plate. Pins are getting red hotted inside the furnace and
automatically dropped in to the
Quenching Oil Bath and hardened.
One 250 cft capacity Endo Gas
generator is coupled with the
furnaces to supply Endo Gas
inside the furnace. We are doing hardening under
controlled atmosphere to resist
decarburisation of the pins.
The temperature required for
this operation is 850 degree
centigrade.
Tempering
: After hardening pins are
tempered in oil tempering
furnace. In this process pins
are dipped in to the hot
(150-325 degree C) oil bath and
checked at an certain interval.
The bucket of pins is kept into
the bath for certain time and
taken out after obtaining
desired Impact value.
Polishing
: Hardened and Tempered pins
are then polished in Rotary
Polishing machines with the help
of certain polishing agents.
Final
Inspection : After polishing
each and every batch of pins are
checked, only good quality pins
are allowed to pack.
Packing : Generally pins
are packed in Card Board Box /
Plastic Box as per the
requirement. |
