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Reversible Rolling Mills and Skin Pass Mills

Reversible Rolling Mills and Skin Pass Mills

FAGOR reversible rolling mills guarantee high productivity, with speeds of up to 2000 m/min and quick roll change, automatic load feed and control by computerised process modelling. Our half-a-million ton per year range rolling mills provide the best performance-to-price ratio on the market. The rolling mill stand has spraying and drying ramps on both sides, and its geometry makes it a highly compact unit with carefully-studied implementation. The main elements of the rolling mill stand are as follows: working cylinders and chucks with a specific diameter for each application; back-up rolls and chucks; clamping cylinders with integrated hydraulic actuators on the roll stand with incorporated position transducer; pumping units with hydraulic actuators to generate the “bending” of the working cylinders; cutting line wedges, which are the mechanisms that keep the line running at a constant speed. They also include spraying systems with fume extraction. The control system includes the following functions, among others: recoiler tension regulation; automatic flatness measurement and control system; automatic thickness measurement and control system; speed synchronism and inertia compensation.

The temper mill or skin pass mill, which may be of the stand-alone type or in-line, enables improvement of the mechanical characteristics and surface quality of the metal. The skin pass process causes permanent lengthening of the strip, orientating the grains in the direction of the strip, which has a positive effect on many of the metal’s mechanical properties. This improves the drawing process, as the plastic deformation obtained eliminates metal creep on the edges of the elastic deformation areas, this being the deformation that generates imperfections on drawing. The so-called creep zone is also eliminated. Similarly, the skin pass mill is able to notably correct the flatness defects caused by hot-rolling. The working rolls provide the material with the desired surface quality, as regards both roughness (Ra) and peaks per inch (PPI). Roughness application is the final strip rolling process and is therefore definitive and defined by the requirements of the end customer, and it is vital for the various subsequent processes (painting, etc.).

Temper mills are equipped with an uncoiler and recoiler, a centring device, entry and exit bridles, anti-crimping rolls, a two- or four-high stand with quick roll change, bending blocks, cutting height adjustment, hydraulic pressing and a control system with a computerised process model. Wet skin-passing may also be performed.
 

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