The processing of wires with a diameter of more than 8 mm is associated with handling challenges, since the large moment of resistance requires correspondingly high forces and moments to be applied when processing the process material. In addition, there are binding health and safety requirements, such as those contained in Directive 2006/42/EC. This Directive requires that the physical stresses on operators must be reduced to a minimum.
This is where the new products for processing large wire diameters from WITELS-ALBERT GmbH come into play, regardless of whether it is the processing of rolled wire, reinforced steel wire, cold heading wire or spring steel wire.
If the geometric and mechanical parameters of a wire as well as the parameters of the straightener or the straightening machine are known, the forces and moments occurring during straightening can be calculated with good approximation. For large wire diameters there are sometimes straightening forces of more than 100 kN per straightening roller. A simple mechanism for the individual adjustment of straightening rollers under this load is possible and available. A compact and affordable mechanism for the quick-opening/closing mechanism working against all straightening rollers and using only the muscular power of the operator is not, however.
Therefore, it was considered impossible to implement the following features for processing large wire diameters in one design.
- Individually adjustable straightening rollers to ensure an identical zero line for different wire diameters/cross-sectional geometries and a collision-free wire path between the first and second straightening plane.
- Mechanical position indicators PO for the defined and reproducible adjustment of the straightening rollers.
- Quick opening/closing mechanism. Compact, simple and reasonable.
WITELS-ALBERT GmbH has solved this conflict and introduces a total of 9 new straightening machines for the processing of wires with a total diameter range from 9 mm to 40 mm. Depending on the application area and wire properties, models with 5, 7 or 9 straightening rollers can be selected.
All RA H PO straightening machines come ex works with hydraulic cylinders for the quick opening/closing mechanism and with straightening rollers of the WR series. Depending on the application, the wire material, the yield point of the wire and/or the wire speed, it can be useful to use rollers of the GB SL series on straightening machines. These high-performance straightening rollers have special bearings, a fully hardened sleeve made of a very wear-resistant steel material and they can be re-greased.