Danieli Fröhling’s newly developed CNC-Super Slitter (CNC-SS) recently passed production trials at Friedrich Gustav Theis GmbH, Hagen, and Krupp VDM, Werdohl, both in Germany. The new slitter heads were incorporated in newly supplied slitting lines at both facilities.

Successful tests were carried out with ‘injection needle steel’ having a tensile strength of about 500 N/mm² at an elongation of 50%. Constant slitting of this material has been achieved at thicknesses of 0.12 mm and slit strip widths of 9 mm. The guaranteed minimum slit strip width of 6 mm will be shown soon.

Special solutions on the line facilitate increased stiffness (up to 50%), and an optimized tool clamping procedure facilitates improved cutting accuracy and reliability, in particular for super-ductile strip, which can be now slit with more cuts. An additional feature of the lines is the vacuum roll braking unit, assuring low-friction and smooth handling of sensitive strips. The lines also feature quick and automated tool changing at the slitting shear as well as mandrel changing at the recoilers.

The F. Gustav Theis slitting line will process stainless steel strip with tensile strength ranging from 300 to 2,500 N/mm² for strip widths ranging from 200 to 660 mm, thicknesses from 0.08 to 0.8 mm and coil weights of 13,000 kg. The line will process a maximum of 31 cuts at line speeds up to 400 meters per minute, maximum.

The Krupp VDM slitting line will process Al-Cr and Ni-alloyed steels with tensile strength ranging from 300 to 1,700 N/mm² for strip widths ranging from 150 to 800 mm, thicknesses from 0.02 to 0.5 mm and coil weights of 9,000 kg. The line will process a maximum of 45 cuts at line speeds up to 460 meters per minute, maximum.