TPT November 2015

Tube mi l ls & rol l forming l ines

New standards in milling stainless steel

to customer requirements, and are in operation. The machine from the Linsinger PFM series ensures the optimum preparation of the welding seams on the two long sides of the stainless steel plates. The machine has a vertical plate waviness tracking function, and the milling units work over the whole plate length with high precision. They allow the whole milling profile to be produced in a single working step on both long sides at the same time. This is an important advantage for perfect welding, which should ideally be produced in one step. The cutter head must be replaced only when changing to a different profile, and this exchange can also be automated. Another advantage of the PFM is its flexibility. All parameters can be adapted to the different types of stainless steels. As the machine measures each plate separately, even the smallest batch sizes can be produced efficiently. Linsinger has also developed specific, multi-layer coated and particularly resistant carbide inserts with special cutting geometries for a wide range of stainless steels. Linsinger Maschinenbau GmbH – Austria Fax: +43 7613 8840 951 Email: maschinenbau@linsinger.com Website: www.linsinger.com

Linsinger, an Austrian manufacturer of special-purpose machines, has taken on this challenge. The first stainless steel plate edge milling machine has been successfully in use since 2011 at the premises of a producer of stainless steel pipes. In the longitudinal welding process, pipes for the natural gas and oil industry are manufactured. A further three plate edge milling machines for stainless steel have been designed and built according

STAINLESS steel is a challenging material for milling machines. It readily clogs the cutting tool due to its toughness. The varying chemical compositions and mechanical properties of the individual types of stainless steel require completely different cutting and tension parameters to non-alloy steels, and the maximum processing speed is correspondingly lower. Efficient machining of stainless steels therefore poses a significant challenge.

Stainless steel plate edge milling technology from Linsinger

Is rollforming a bending method? AS defined, rollforming is a pure bending method. On the shop floor, however, additional massive forming often occurs, sometimes desirably, but often not. This can hardly be avoided, if a hem should be folded at the sheet edge with a few roll stands only. The designer wants to have a reliable prediction about the result of these effects. For this, finite element analysis (FEA) is particularly suitable. In doing so, shell and solid elements can be selected. simulation model for the FEA system LS-DYNA automatically. In the case of a solid model, selection among two, four, six or more elements in sheet thickness direction is possible.

These and more new functions will be shown at the Blechexpo exhibition, 3-6 November, in Stuttgart, Germany – Hall 7, Stand 7508 (EFB joint stand). The FEA system LS-DYNA will be at the same stand, presented by DYNAmore. The new release will be available from December 2015.

Shell elements are suited to pure bending; the calculation is quick and effective. However, limits exist if massive forming occurs. In this case solid elements are better. The calculation, however, needs more time to be completed. In the new release of the roll form design software UBECO Profil, the designer can select between shell and solid elements, dependent on the application. The software creates the

Other applications include desired sheet thickness modifications such as forming a notch into the sheet or forming outer radii that are smaller than the sheet thickness. Deep drawing effects often occur undesirably, eg if two or more bending zones on one profile side are formed at the same time and the sheet edges are prevented from ‘flowing’ into the roll stand.

UBECO GmbH – Germany Fax: +49 2371 45550 Email: info@ubeco.com Website: www.ubeco.com

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N ovember 2015