WCA January 2009

and

Dry drawing AS wire

Model TMD 8D670 drawing machine ❍ ❍

“ Two proven techniques, aluminium rod rolling from Continuus-Properzi and steel rod drawing from OTT’s wire machinery division, are united to bring synergy to the process of dry drawing,” explains Mr R Contini, sales director of the wire machinery division. AS wire is produced by initially extruding aluminium rod on a steel wire, and then reducing to the final size by drawing. The drawing technique, known as dry drawing by pressure dies, is designed to avoid stripping the aluminium from the steel core during the operation. The wire passing through special dies and bushings, which guarantee the required lubrication, generates the pressure needed to facilitate the drawing process. The drawing of AS wire has undergone years of research and development aimed to improve major process variables in order to boost quality and productivity while reducing operational costs. The main requirements of the AS wire drawing process are best met with a non-slip type drawing line that provides efficient cooling of the blocks and dies, possesses the most appropriate block profile, accurately synchronises the blocks and facilitates easy alignment of the die holders. The high performance of the capstan and die cooling technology, the lack of wire path deviation, improved back tension control, a lack of wire torsion, and the use of the most modern inverters and AC motors combine

1) Material: AS WIRE ‘20SA’

Number of blocks: 8

Wire diameter

Inlet: 7.35mm

Outlet: 3.45mm

Tensile Speed

Outlet: 1400 N/mm 2

3.8 m/s

2) Material: AS WIRE ‘20SA’

Number of blocks: 8

Wire diameter

Inlet: 6.3mm

Outlet: 2.89mm

Tensile Speed

Outlet: 1400 N/mm 2

5.4 m/s

3) Material: AS WIRE ‘20SA’

Number of blocks: 8

Wire diameter

Inlet: 4.4mm

Outlet: 2.05mm

Tensile Speed

Outlet: 1400 N/mm 2

7.2 m/s

4) Material: AS WIRE ‘20SA’

Number of blocks: 10

Wire diameter

Inlet: 7mm

Outlet: 2.2mm

Tensile Speed

Outlet: 1400 N/mm 2

7.5 m/s

5) Material: AS WIRE ‘27SA’

Number of blocks: 8

Wire diameter

Inlet: 6mm

Outlet: 2.2mm

Tensile Speed

Outlet: 1060 N/mm 2

4.5 m/s

6) Material: AS WIRE ‘40SA’

Number of blocks: 6

Wire diameter

Inlet: 6.65mm

Outlet: 3.5mm

Tensile Speed

Outlet: 680 N/mm 2

3.5 m/s

Performance of the drawing line ❍ ❍

to maximise product quality while optimising machine performance. The drawing line is composed of a drawing machine with vertical axis blocks of 670mm, a motorised pay off for single bobbin up to 1,800mm, a cleaning unit, and a take up for single bobbin up to 1,250mm. The number of blocks of the drawing machine depends on the desired reduction as well as the required final tensile strength of the wire. The most common machine is composed of eight blocks, although machines with ten blocks have been supplied where there is a requirement for different wire diameters and tensile strengths, or to provide flexibility.

The drawing machine is also equipped with completely sealed safety guards, internal lamps and an exhaust system to evacuate the dust generated during the drawing process.

Continuus-Properzi SpA – Italy Fax : +39 0298 10358

Email : sales@properzi.it

Website : www.properzi.com

40

Wire & Cable ASIA – January/February 2009