May 2014
36
News
Technology
Catering for a range of diameters
Violi specialises in the design and production of industrial
machinery dedicated to the manufacturing of tubes and
wires, typically used in the processes of drawing, winding,
straightening and cutting.
The MRT series for tubes and bars is equipped with
straightening groups consisting of hyperbolic pairs of rollers
obliquely mounted and having an inclination opposed to each
pair.
The orientation of the axes, combined with the hyperbolic
geometry of the rollers, allows the profile to rotate forward.
All the rollers are mounted on motorised and independent
supports flowing within bushings that allow the operator to
modify the height and the angle of the system.
Acting on the vertical axis is possible to adapt the straightening
machine to different diameters and to correct the line of the
advancement of the profile in order to create a process of metal
stressing and to get products perfectly straight.
The MRT line includes three models with different capacities:
MRT5 for tubes and bars with diameters from 3 to 11mm,
MRT5M for tubes and bars with diameters from 10 to 30mm; and
MRT5M50 for tubes and bars with diameters from 25 to 50mm.
Violi Srl – Italy
Website
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In control with Sitel
In Sitel Control’s treatment lines, the material is first heated to a
temperature between about 850 and 950°C, followed by a sharp
cooling in water (hardening section) and further heating to a
temperature between 450 and 700°C (tempering section).
The combination of
the two operations
constitutes the hard-
ening and tempering
operation: the hard-
ened and tempered
material acquires a
structure with a very
fine grain with a
considerable increase in the limit of elasticity, flow limit and
resistance to tensile stress.
For a correct thermal treatment of material, a fibre optic infrared
thermometer is used, the model Fibratemp, that is extremely
compact with a measurement spot of 1.6mm at 300mm
distance, and provides a high efficiency laser pointing system.
The optical measuring head and the optical fibre can stand
ambient temperatures up to 315°C without cooling. These
thermometers have a range of temperature from 250 to 600°C
and from 600 to 1,200°C, with response time of 20ms and a
precision of 0.25 per cent.
The output signal is analogue 4 to 20 mA or digital RS485 to be
easily interfaced with thermal regulation systems.
The mechanical fixtures comprise adjustable support, fast field
connector and air purge system for the front cleaning.
Sitel Control Srl – Italy Website
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The Fibratemp from Sitel Control
