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THE
COMPONETS PARTS OF A WIRE ROPES: |
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| A
Wire rope serves as a flexible tackle to transmit
pulling force over a distance, to perform hauling,
hoisting or suspending operation. To achieve the
necessary flexibility, together with the strength
and to fulfill its desired function, the rope is
made up of elements called wires and strands. The
rope is formed generally of six strands. Ropes with
eight strands are also in use for more flexibility. |
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| PROCESS
OF WIRE ROPE MAKING: |
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| Patenting
(Heat Treatment): |
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| Steel
wire ropes are made from high carbon
Steel. The wire rods are heat treated
above their point of transformation
whereupon they attain a homogeneous
granular structure in a process called
‘patenting’. |
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| Pickling
(Descaling): |
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| Oxide
forms on the surface of rod/wire, after
patenting. This necessitates cleaning
the rod/wire by immersing it in a tank
of cold Hydrochloric acid, rinsing thoroughly
with a jet of water, and finally covering
the surface with a layer of protective
phosphate coating. |
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| Drawing:
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| It
is a cold process, involving plastic
deformation of steel, leading the wires
to acquire their final mechanical characteristics
with regard to shape, size and physical
properties. |
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| Galvanising
(Zinc Coating): |
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| TO
protect the wire, especially in a corrective
atmosphere, a coat of zinc is applied
by the ‘Hot Dip’ process
i.e. by passing the wire through a molten
zinc bath. |
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| Inspection
After Galvanising : |
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| Samples
from galvanised coil are checked for
amount of zinc coating, uniformity of
coating. Other physical properties are
also checked e.g. tensile strength,
percentage, elongation, wrapping, etc. |
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| Winding
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| finished
wires, hitherto in coil form, are wound
onto bobbins to be fed into stranding
machines. |
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| Stranding
: |
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| A
predetermined number of wires are helically
laid around a center to form a structural
unit called ‘Strand’. |
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| Inspection
After Stranding: |
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| Strands
samples are checked for all the properties
stipulated in the strandard, e.g. breaking
strength, proof stress, lay length,
etc. |
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| Closing
(Roping) : |
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| A
predetermined number of strands (generally
six) are laid helically around a core,
(fibre or steel) to as steel Wire Rope. |
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| Packing
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| Single
wire coil or strands are packed in such a
way that the coil / reel is kept intact during
transit and also ensure protection against
rust. |
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| Handling
and use of Wire Rope |
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Proper
winding of a rope on a drum |
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Capacity
of drums and reels |
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