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Wire Rope is consisted of Core and several Strands surrounding the Core
Number of Strands differs according to
the constitution but 3~8 in general, and the number
of Wire which consists strand differs according to
the use of wire rope
Wire Rope is classified Fiber Core and Steel Core according to material of Core
Fiber Core are stranded and comprised of either natural fibers such as sisal, hemp, jute and cotton, or synthetic fiber such as polyamide, polyethylene and polypropylene. It’s usually used for lifting light weight and needs easy handling.
Steel Core also can be classified IWRC (Independent wire rope core) and IWSC (Independent wire strands core). For IWRC, the main core is an independent wire rope, normally having the construction 7×7, For IWSC, the main core is an independent wire strands, normally having the same construction as the outer strands of the rope)
The lays of wire ropes, with few exceptions,
are roughly divided into two kinds-Regular lay
and Lang’s lay
Normally, right hand lay (Z lay) is used,
but for preventing rotation, left hand lay (S lay)
can use with Z lay together.
| Regular Lay | Lang’s Lay | |
|---|---|---|
Appearance |
The wires are approximately parallel to the axis of the rope |
The wire for a certain angle with the rope |
Merits |
Less Kink / rotation Easy to handle |
Superior in wear resistance Good fatigue resistance |
Demerits |
Inferior in wear resistance |
Kink easily Large torque |
The breaking load is determined by nominal
tension of wires making up the rope and
is classified as shown below table
| Tensile strength | Remarks | |
|---|---|---|
Grade E |
135 kg/㎟ |
Un-galvanized |
Grade G |
150 kg/㎟ |
Galvanized |
Grade A |
165 kg/㎟ |
Un-galvanized, Galvanized |
Grade B |
180 kg/㎟ |
Un-galvanized, Galvanized |
Grade C |
195 kg/㎟ |
Un-galvanized, Galvanized |
Rope grease is applied to the rope at
the time of manufacture to prevent
corrosion and also to provide lubrication.
The kind of grease applied will greatly
influence the life of the rope.
There are two representative greases,
the red rope grease based Petrolatum used for
better lubricating, and the black grease based
Asphalt used for strong against anti-rust and so on.
The size of a wire rope is diameter of the circle
which closers allthe wires. The correct methods is
to measure over any pair of opposite strands.
