TPT May 2012

C utting

Four-blade milling cut-off THE main features of milling type flying cut-off machines equipped with tungsten carbide tip (TCT) saw blades are clear cutting surface and less deformation at the cutting end. motion of the RSC is performed by a rotary disc on which swing blades are mounted. The machine weight can be reduced and a robust structure is realised thanks to a simple and compact mechanism, by uniting the cutting heads with the main motors and blade feeding motors. Automated systems ADVANCETECH in collaboration with Rusch-Scortegagna proposes a complete range of machines and accessories for the thermic cut of sheet, tubes and beams. These products allow cutting, drilling, tapping and calking operations. personalisation. The solutions can provide high productivity and quality of working surfaces, either plane or inclined. The automation level of the installations allows the operator to carry out other jobs, and features include simplicity of use together with modern programming systems. Advancetech provides after-sales Fax: +39 0445 320250 Email: export@rusch.eu Website: www.rusch.eu Modern levelling and cut-to- length lines The Advancetech machines are quick, easy to operate, and offer a high degree of In addition to its existing ‘RLC’ two-blade milling cut-off, Japanese manufacturer Nakata has developed the Rotary Swing Cutter (RSC), a new four-blade machine for large size mills over 16" OD. The cut-off The machine has a strong clamp system, which is indispensable for stable cut-off. The system clamps the pipe at two positions both

for entry and exit sides for the large size pipe mill. Nakata examined and analysed various cut-off conditions in order to implement the most appropriate one for achieving longer life of the TCT blades. Nakata Mfg Co Ltd – Japan Fax: +81 6 6303 1905

Email: sales@nakata-mfg.co.jp Website: www.nakata-mfg.com

assistance to support the final customer, including free tele-assistance service on all machines. Rüsch-Scortegagna Srl – Italy

SEVERAL things are changing in the market of steel sheet, with important consequences for machines designed to produce it and turn the strip from the coil (in various widths and thicknesses) in to “cut sheets” prepared for the processing of final products. The cut-to-length lines are the most affected by the evolution in act. The growing demand for rolled products pushes to

increase the speed and precision of cutting: working speed of thickness up to 3mm is 80m/min with an accuracy of ±0.25mm on the length (cut with rotary shear). For thicknesses up to 8mm working speed is 40m/min with cutting accuracy ±0.25mm on the length (cut with rotary shear). For thickness from 4 to 20mm, the speed is 40/20m/min with a length tolerance ±0.5mm (cut with flying shear).

curvature of the winding coil) is generally underestimated. The operation is, however, of fundamental importance for the quality of the sheet. If levelling is not perfect, the plate may seem flat but retain residual stresses in it. In its transformation into finished products, for example by precision trimming (or fine trimming) cutting the material with the punch, the fibres are cut and the internal tensions are released: the result is uncontrolled deformations and blanks geometrically different from the punch and the drawing. Deformations are often unacceptable for quality products. The same drawback occurs in the heat precision cutting, for example with high-definition plasma or laser. The increase of the quality requirements imposes a levelling almost perfect and, then, levelling lines of greater efficacy and efficiency. Euroslitter – Italy Email: ufficiocommerciale@euroslitter.com Website: www.euroslitter.com

But in recent years there has been also the spread of high strength steels whose superior mechanical properties require – for cutting and levelling – forces and higher powers involving the critical review of the entire mechanics of machines that make up these lines. The importance of the levelling (not to be confused with the straightening that only serves to remove the residual

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M ay 2012