The cold drawing process which will be broken down into several sub-stages
The first stage of cold drawing is de-scaling where the wire rod coils are pulled through a set of vertical and horizontal rollers that remove the surface scale from the rods thereby cleaning the raw material.
Before the material is cold reduced the material goes through a lubrication box, which primes the material for processing. Lubrication is essential in order to maintain high efficiency and speed that is required in the drawing process.
After material is de-scaled and lubricated it passes through a drawing die box which consists of cartridges made of tungsten carbide that reduce the wire to the target diameter increasing its tensile strength while maintaining elongation and bending properties.
After the material has passed the first set of drawing rolls, the material is then ribbed modifying the smooth wire to ribbed wire. The ribbing patterns are determined by the specifications of the material required.
Once the material has been drawn and ribbed it is then rolled onto a spool which is an intermediate stage before it is either converted directly into compact coils or stored temporarily before being cut into the required length for reinforcement bar/plain bars or pre-cut for wire mesh production. This stage represents the end of the manufacturing process for compact coil production.
The wire is either cut through parabolic (2- planes) or hyperbolic (360 degree plane straighteners. Hyperbolic straightening is used for the production of plain bars or pre-cut wires for wire mesh and parabolic straightening is used to produce reinforcement bar, double wire cut at high speed and accuracy. This represents the end of the production process for plain/reinforcement bar.
CUT THE WIRE
the mesh welding process
through a semi automatic process
using pre-cut wires. The wire lengths
are pre-determined by the customer and
the production takes place at a speed of
120 welds per minute after which the steel sheets are tilted and stacked.