The Rolling Mill IV° 800 is made up of the following machines:
Pos Description
1 Loading cradle
2 Double pay-off reel and motor unit
3 Upper roller
4 Automatic strap cutter
5 Roll opening claw
6 Pinch-roll roller
7 Centering and straightening group
8 Right coil winding/unwinding reel and motor unit
9 Right coil loading/unloading
cradle 10 Overtaking table
11 Felt press
12 Cross shear
13 RX meter
14 Rolling stand and motor unit
Automatic / Manual from 0.25 mm to 6 mm from 480 mm to 785 mm 2100 mm
Hot rolled steel 600 N/mm2 1000 N/mm2

15 Left coil winding reel 1
16 Left coil unloading cradle 1
17 Hydraulic power unit 1

18 Electrical panel
19 Line control pulpits
20 Pump control pulpit
1 4 1


Use and Maintenance Instructions Manual - Rolling Mill IV° 800 Rolling Mill IV° 800 Layout
Left unloading cradle

P05

Electrical panel

Right reel motor
Left reel
motor
Press
P04
Shear
RX meter
Rolling stand
Left cage motor Right
cage motor
P03
Shear
RX meter
Press
Right unloading cradle
Right
reel Levelling unit
Pay-off
reel Right pay-off reel motor
Loading cradle

P02
P01

Left pay-off reel motor

LINE DESCRIPTION
The manufacturing process is complex and laborious, considering the variables that impact the process. The line is automatic but includes an initial phase that is repeated at each coil change and the machine adaptation to this change. The manufacturing process is described below, with the individual machines used, and the risk factors and operations to which particular attention must be paid are highlighted.
2.2.1 Coil loading cradle.
The manufacturing process begins with the loading of the coil, properly trimmed to size, which is loaded via the loading cradle (Figure 2).
Figure 2: Coil loading cradle
. The loading cradle is equipped with a double motor, one for the vertical translation of the coil, achieved by a hydraulic cylinder, and one for transport on the unwinding axis of the line, controlled by a rack and pinion system driven by a gearmotor. It should be noted that the gearmotor that allows the longitudinal movement of the coil is keyed directly onto the support wheels.
Rolling mill IV° 800. In this way, the coil will be positioned in line with the unwinding mandrel and can therefore be
inserted into the line.
2.2.2 Double pay-off unwinding reel.
The double pay-off unwinder consists of a sturdy, self-supporting structure made of electro-welded and standardized metalwork. This structure features special bushings to house the expansion mandrel bearings, which are machine-bored to ensure concentricity.
The two supporting shafts of the corresponding expansion mandrels are made of special 39NiCrMo4 steel, machined using machine tools. The expansion mandrels rotate on double-row radial roller bearings. They are lubricated externally via dedicated greasing points. The expansion of the mandrels is achieved by moving the circular-section "copponi." Their movement is actuated by a mechanical hydraulic system that uses hydraulic cylinders to tilt the crank mechanisms underneath.