The IV° 800 rolling mill 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
7 Centering unit and straightening
8 Right winding/unwinding reel and motor unit
9 Right coil loading/unloading cradle
10 Overtaking table
11 Felt press
12 Transversal shear
13 RX measuring device
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 winding reel 1
16 Left coil unloading cradle 1
17 Hydraulic hydraulic control unit 1

18 Electrical panel
19 Line control consoles
20 Pump control console
1 4 1


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

P05

Electrical panel

Reel Motor
Left Reel
Motor Left Reel
Press
P04

RX
Meter Stand Left Cage
Motor
Right Stand Motor
P03
Shears
Measurement RX
Press
unloading cradle
Right reel
Leveling unit
Pay-off
reel Right Pay-off reel motor
Loading cradle

P02
P01

Left pay-off reel motor

DESCRIPTION OF THE LINE
The manufacturing process is complex and laborious, considering the variables that impact the process.
The line is automatic but involves an initial phase that is repeated with each change of coil and adaptation of the machine 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 motorization, one for vertical translation of the coil, made with a hydraulic cylinder, and one for transport on the unwinding axis of the line with control by means of a rack and pinion system operated by a gearmotor.
It should be noted that the gearmotor which allows the longitudinal movement of the coil is keyed directly onto the support wheels. Rolling mill IV° 800 By doing this the coil will be positioned in axis with the unwinding mandrel and can therefore be
inserted into the line.
2.2.2 Double pay-off reel.
The double pay-off unwinder is made up of a robust self-supporting structure made of electro-welded and normalized carpentry.
This structure has appropriate bushings for housing the bearings of the expanding mandrels, bored to the machine tools in order to guarantee their concentricity. The two supporting shafts of the corresponding expanding chucks are made of special 39NiCrMo4 steel machined. The expanding mandrels rotate on radial rolling bearings with double rows of rollers. They are lubricated from the outside via special greasing points. The expansion of the mandrels is achieved by moving the circular section "copponi". Their movement is operated via a hydraulic mechanical system which uses hydraulic cylinders to tilt the crank mechanisms present underneath