Slitting and Trimming Lines

Our Slitting Lines (Slitter) are designed to guarantee the best strip surface quality and highest production capacity. These results are possible thanks to a series of special machines and devices designed by FIMI.

FIMI Slitter can be equipped with additional devices, such as: robots for cutting equipment and separating disks, automatic changing of equipment and cutting heads, strip thickness measuring devices, strip inspection devices, oiling machines, etc.

Main Features

0,00 - 00,1 mm

Material thickness range

0 - 0 mm

Strip width range

0 m/min

Maximum working speed

0 N/mm2

Maximum tensile strength

0 ton

Maximum coil weight

Patents

NFTS®
NON-FRICTION TENSIONING SYSTEM

This is a patented FIMI system designed to ensure uniform recoiling tension for all strips obtained in the slitting lines process of a coil strip.

This tensioning system can be applied in multiple configurations, depending on the types of material, their mechanical and geometric characteristics and the surface features of the strip.

The unit in the image above, represents one of the many configurations and, specifically, presents:

motorised pre-tensioning roll, blue coloured, which collects sliding strips from the loop pit.
tensioning pinch-roll red coloured, which provides uniform tension between the strips.
deflector roll in blue coloured.

Each roll is motorised, characterised by a special pulley construction solution, independent and equipped with a patented internal braking system for the individual pulleys, which is as simple as it is effective and easy to maintain.

Media

Product range

Slitting lines for automotive applications are specially designed to meet the demands of surface quality and cutting precision. The typical thickness range is 0.3 – 3.0 mm, reaching up to 8 mm in case of automotive structural steels with thickness variation on the entire coil length, obtained by a special rolling process. The material processed is either steel or aluminium, even high strength.

Special cutting line configuration for processing high and ultra-high strength materials, up to 2.000 Mpa. Typical application: blades for grass-cutting machines.

Slitting lines for hot-rolled heavy gauge steels have been successfully developed to meet typical applications in structural engineering, cranes, general lifting equipment, wind turbine poles and the tube industry. The thickness range is typically 1-8 mm but, in some cases, up to 16-18 mm (tubes). These slitting lines require special solutions for the strip feeding process, especially after the slitting shear, mainly for cutting and handling of scraps and for the recoiling and the unloading of the strip.

Specific uncoiling, cutting, braking and recoiling solutions to achieve both the respect of the strip surface and the integrity of the strip’s internal metal structure, required by the pre-painting and grain-oriented steel process.

These cutting lines are characterised by machines, technical solutions and devices that must match the nature and the typical properties of these metals:

Stainless steel up to 18 mm thickness for applications in chemistry, nuclear power plants, food industry, architecture.
Aluminium, Copper and Brass up to a thickness of 0.1 mm, which implies a high working speed of 800 m/min.
For all applications, the strip tension is applied with high precision downstream of the uncoiler.
For all applications, the cutting shear is equipped with an automatic change of cutting equipment configuration or automatic change of the complete cutting head.
Special features, such as the quick change of the recoiler mandrel, are implemented.

These lines, operating at high speed (typically up to 400 m/min) are designed for very high productivity (around 400,000 tons/year) and are equipped with special devices such as:

Thickness measuring device.
Inspection cabins with lights, mirrors and surface quality inspection devices.
High-speed rotary shear to discard damaged portions of coil, thanks to a Level 2 connection between the line and the rolling mill.
Side trimming and centre cut with scrap chopper.
Laser welding of strips.
Surface oiling and oil thickness measurement.
Strip recoiler to avoid it getting stuck in the mandrel.
Automatic coil strapping, weighing and labelling.

The line consists of:

Entry Group

Coil storage and loading.
Coil uncoiling and opening.
Strip centring and steering.
Strip straightening and/or pre-levelling.
Dividing

Shearing

Slitting or trimming equipped with belt centring and smoothing.
Recoiling and/or side scrap cutter.

Loop

Devices for controlling and guiding the belt and/or loop strips.
Devices for easy loop overtaking during material introduction.
Anti-fall devices on the tail of the belt in the pit.

Tensioning

Slit strips tensioning is a special function of a slitting line: tension is transmitted on the slit strips to generate a perfect bundle of tightly wound sub-coils on the Recoiler. Tensioning is characterised by a variety of systems engineered and designed according to the quality of the strip surface and its thickness: the extreme limits, in this respect, are represented by aluminium and stainless-steel BA quality and carbon steel gauging 18 mm.

Tensioning systems are divided into two families: