For the production of wire several different types of machines are required. First of all there is a difference between the drawing of iron / steel wires and copper or aluminium wires due to the required forces. While copper / aluminium wire is reduced 10 times or more in one machine, drawing machines for ferrous wire have only very seldom more than 10 drawing steps. Also the drawing capstans are a lot bigger in ferrous machines as well as the motors driving the machine. Non-ferrous wire drawing machines are also often equipped with inline annealers to heat up the wire after the drawing process in order to make it soft again. There are a lot of other machines required for the wire drawing process, these include:
- Single Bullblocks
- Enamelling lines (for covering wire with lacquer)
- Plating lines (for covering wire with materials like tin)
- Annealers (to heat up wire, in order to make soft again)
- Drawing machines, ferrous wires (iron, steel)
- Drawing machines, non-ferrous wires (copper, aluminium)
- Butt welders (to connect ends of wire batches)
About used wire drawing machine
With a used wire drawing machine the diameter resp. the cross-section of a wire is being reduced. To do this the wire is pulled through a drawing die, which has a through bore slightly smaller than the entering wire. The wire is driven by the capstans, which are mostly connected by a gear box to the motors. These capstans surfaces are made from hardened steel or ceramics.
Used wire drawing machines are divided into machine for ferrous (like iron and steel wire) and non-ferrous (like copper or aluminium) wire. Because iron and steel being much sturdier than non-ferrous matreials the drawing machines for this material are often bigger in construction with more power. Also the drawing speeds are slower with these machines.
Because the meachanical stress applied by this cold reforming process the wire looses it's flexibility through the drawing process. To compensate this wire are often annealed after they are drawn to the desired diameter. In non-ferrous wire drawing this is done with electrical resistance in-line annealers, while iron and steel wires are mostly put in seperate ovens.
A used bull block is used to reduce the diameter resp. the cross-section of wire, similar to a drawing machine. Generally bull blocks are used in the iron and steel wire production. A bull block is a single capstan driven by a gear box and motor. The wire is wound around this capstan wheel which can be horizontally or vertically aligned. Through the rotation of the capstan the wire is transported foward and being pulled through a so called drawing die, whichs opening is a little bit smaller than the inlet diameter of the wire. This resulting on a cold reforming of the wire, making it thinner and longer. The drawing die is located inside a die holder, where also drawing emulsion can be applied to improve the wires surface qulity during the drawing process.
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