| Type | Roller diameter | Strip thickness mm | Number of rollers | Standard strip widths | Support | |
|---|---|---|---|---|---|---|
| mm | min. | max. | pieces | mm | ||
| 10 | 10 | 0.1 | 0,5 | 19 | 120, 220 | Support rollers |
| 12 | 12 | 0.2 | 1 | 19 | 120, 220 | Support rollers |
| 15 | 15 | 0.3 | 1,2 | 19 | 120, 220 | Support rollers |
| 18 | 18 | 0.3 | 2 | 9 / 19 | 160, 320, 420 | Support rollers |
| 24 | 24 | 0.4 | 3 | 9 / 21 | 220, 420, 520 | Support rollers |
| 30 | 30 | 0.4 | 4 | 9 / 21 | 220, 420, 620, 820, 1020, 1320 | Support rollers |
| 40 | 40 | 0.5 | 5 | 9 / 11 / 21 | 220, 420, 620, 820, 1020, 1320, 1520 | Support rollers |
| 50 | 50 | 0.6 | 7 | 9 / 11 / 21 | 220, 420, 620, 820, 1020, 1520, 2020 | Support rollers |
| 65 | 65 | 1 | 10 | 9 / 11 / 21 | 420, 620, 820, 1020, 1520, 2020 | Support rollers |
| 80 | 80 | 1,5 | 18 | 9 / 11 / 21 | 420, 620, 820, 1020, 1520, 2020 | Support rollers |
| 100 | 100 | 2 | 26 | 9 / 11 / 21 | 420, 620, 820, 1020, 1520, 2020 | Support rollers |
| 130 | 130 | 3 | 38 | 9 / 11 / 21 | 1020, 1520, 2020, 2520 | Support rollers |
| 160 | 160 | 5 | 56 | 9 / 11 / 17 | 1020, 1520, 2020, 2520 | Support rollers |
| 200 | 200 | 3 | 65 | 9 / 11 / 15 | 1020, 1520, 2020, 2520 | Support rollers |
9-roll straightening machines
are used to straighten out coil curvatures, whereby the coil curvature must always have the same curvature dimension. If this dimension changes and becomes larger, the straightener must be readjusted. It is not possible to achieve the same straightening quality from the outer to the inner coil diameter. Likewise, existing stresses in the material are not relieved.
21-roll straightening machines
are used to straighten the starting material exactly, regardless of the size of the coil bend. The machine even straightens out alternating bends. One advantage of the precision straightening machine is that the tension in the coil material is relieved, making further processing easier.
Straightening result
In order to achieve a perfect straightening result, it is necessary that the material to be straightened has the same strength over the entire cross-section. Edge waviness or dents can only be straightened within the limits of the physical possibilities.
Straightening is only possible if the material to be straightened is brought above the elastic limit in the straightening machine. Straightening does not take place below this limit. The material returns to its original state.
Straightening itself takes place between the elastic limit and the yield point. Above the yield point, the material stretches.
Sheets up to over 50 mm thick and strips up to the thinnest foils are straightened in straightening machines before further processing.
The sheet is subjected to a multiple back and forth bending process with decreasing curvature between rollers, the arrangement of which is shown above. The number of straightening rollers depends on the desired straightening result. The most difficult sheets to straighten are those that not only have unevenness in the rolling direction, but also across it. In this case, at least one precision straightening machine is required, although it may be necessary to repeat the straightening process several times in order to eliminate the multi-axial stress states in the sheet. The best straightening results are achieved on a precision straightening machine that is designed to be extremely low-stretch and equipped with roller deflection.
LORENZ straightening machines are therefore equipped with high bending and elongation rigidity.
The entire development is based on 50 years of experience.
Continuous straightenin
The material thickness is set at the outfeed of the machine and the material thickness - infeed is set at the infeed. Corresponding values are calculated in the comfort control or can be taken from the infeed diagram. The material is straightened in the throughfeed directionThe straightening itself takes place between the elasticity and yield point. The material stretches above the yield point.
Edge straightenin
In this type of straightening, the strip is additionally straightened in the direction of the sabre. This effect occurs by clamping the strip before and after the straightening machine. The upright straightening unit located at the outlet is moved out of the middle for this purpose. However, the actual edge straightening effect occurs in the straightener, as the material is in the plastic range there.
Straightening machines Roll diameter 10 - 65
Material strength 500 N/mm2
Straightening machines Roll diameter 80 - 200
Material strength 500 N/mm2
Standard gearbox
The gearbox has a single-stage / two-stage design and distributes the drive force evenly to all straightening rollers. All gears are case-hardened and completely ground. They also run in needle bearings. The gearbox is oil-filled and not connected to the recirculating oil lubrication system.
Gearbox High-performance straightener
The gearbox has a single-stage / two-stage design and distributes the drive force evenly to all straightening rollers. All gears are case-hardened and completely ground. They also run in needle bearings. The gearbox is oil-filled and not connected to the recirculating oil lubrication system.
Standard cardan shafts
The cardan shafts essentially consist of 2 ball joints, which are equipped with a length compensation.
Power is transmitted to the gearbox and straightening rollers via pins.
High-performance cardan shaf
The cardan shafts made of special material essentially consist of 2 ball joints equipped with length compensation.
Power is transmitted to the gearbox and the straightening rollers via splines.
Drive
The drive is provided by a maintenance-free three-phase motor that is controlled by a frequency converter. Power is transmitted from the motor to the gearbox via belts to absorb shocks caused by the straightening process.
A current-dependent overload protection protects the machine from excessive loads.
The belt puller is equipped with 2 hardened and ground rollers. The upper roller is fed by a pneumatic cylinder, the contact pressure of which can be adjusted by a pressure control valve. It is necessary to regulate the contact pressure to allow for the different material thicknesses.
The belt take-off is equipped with 2 hardened and ground rollers. The upper roller is fed via a pneumatic cylinder whose contact pressure can be adjusted using a proportional pressure control valve.
It is necessary to regulate the contact pressure in order to take into account the different material thicknesses.
The set pressure is stored in the tool data memory.
Standard belt side guid
There is a belt side guide on the infeed side, which consists of 2 horizontal deflection rollers + 2 vertical side guide rollers. The vertical guide rollers can be adjusted centrally via a spindle. The setting values can be read digitally on a counter.
All rollers are hardened
Motorized belt side guide
There is a belt side guide on the infeed side, which consists of 2 horizontal deflection rollers + 2 vertical side guide rollers. The vertical guide rollers can be adjusted centrally by motor.
The setting values can be stored in the tool data memory.
All rollers are hardened.
Manual roller frame adjustment
The complete upper roller frame is adjusted by 2 handwheels, which adjust the height of the machine infeed and outfeed. Normally, the material thickness of the material to be straightened is set on the outfeed side. On the infeed side, an infeed is selected that is below the material thickness. The corresponding setting values can be taken from the infeed diagram supplied.
The machine setting is measured using two digital sensors and can be read on the control panel. The reading accuracy is 0.01
Motorized roller frame adjustment
The complete upper roller frame is adjusted by 2 spur gear motors, each of which adjusts the height of the machine infeed and outfeed. Normally, the material thickness of the material to be straightened is set on the outfeed side. On the infeed side, an infeed is selected that is below the material thickness. The corresponding setting values can be taken from the infeed diagram supplied.
The machine setting is measured using two position sensors. The reading accuracy is digitally 0.01 mm and can be read and saved on the control panel.
Quick-change device extended
The complete straightening roller bearing is mounted on a slide plate.
This slide plate, on which the straightening rollers and the entire support are mounted, is extended so that a change can be carried out quickly and easily at an accessible point.
An additional bearing point on the gearbox side, mounted directly on the roller frame, accommodates the so-called driver and holds the drive shafts in place when the straightening cassette is extended. This means that the PTO shaft does not need to be loosened for machine cleaning.
Standard quick-change device
The straightening roller bearing is mounted directly on the roller frame, but is supplemented by an additional bearing point on the gearbox side. As with the quick-change device, a “driver” is mounted between this bearing point and the straightening roller bearing point on the gearbox side, which holds the drive shafts in place when the rollers are pulled out.
In principle, the bearing is constructed in the same way as the quick-change device, but here it is not possible to move the rollers completely out of the machine with the bearing.
The intermediate rollers prevent the support rollers from being imprinted on the belt to be straightened. This effect occurs because the straightening rollers are smoothed at the points where the back-up rollers run. This different surface roughness is visually reflected on the belt.
Stripes appear, which also reappear when the belt is subsequently coated. The intermediate roller diameter is always kept smaller than the straightening roller diameter. This achieves an additional cleaning effect.
Infeed side of the straightener
The 9-roller straightener is mounted on the inlet side of the straightener. There is a second straightening unit with 4 rollers on the outfeed side. The upright straightener on the infeed side is adjusted using 2 handwheels. The outfeed side can be adjusted centrally to the belt width via hand wheels and moved off-center.
This arrangement allows the sabre in the belt to be minimize
Outfeed side straightener
Standard insertion aid
The insertion aid is designed as a compact unit and is located directly in front of the belt puller.
Insertion wedge from belo
The infeed wedge, which is hydraulically adjustable in length and inclination, takes the strap from the coiler and transfers it to the straightener.
Hold-down roller from abov
With the help of the hydraulically operated hold-down roller, the coil bend at the start of the strip is pressed smooth so that the strip can be driven into the strip take-off mounted directly in front of the straightening machine.
Universal insertion aid
The insertion aid is designed as a compact unit, is located directly in front of the strip take-off and has the following features.
Insertion wedge from below + above
The infeed wedge, which is hydraulically adjustable in length and inclination, takes the strap from the coiler and transfers it to the straightener.
Hold-down roller from below + above
With the help of the hydraulically operated hold-down roller, the coil bend at the beginning of the strip is pressed smooth so that the strip can be driven into the strip take-off mounted directly in front of the straightener.
Pressure arm from above
Hydraulically operated, prevents the coil from jumping up when the drums are opened and the associated danger. The speed and contact pressure are adjustable. The roller brakes during rewinding and applies tension to the material during winding.
Pressure roller with drive for advancing the start of the tape and for rewinding.
The arm width is approx. 80 mm. This limits the minimum strap width that can be threaded with the pressure arm to 80 mm. The pressure arm is attached to the housing of the straightener.
The cylinder has seat valves which maintain the pressure in the cylinder if the hose breaks.
Pressure arm from below
Hydraulically operated, prevents the coil from jumping up when the bandages are opened and the associated danger. The speed and the contact pressure are adjustable. The roller brakes during rewinding and applies tension to the material during winding.
Pressure roller with drive for advancing the start of the tape and for rewinding.
The arm width is approx. 80 mm. This limits the minimum strap width that can be threaded with the pressure arm to 80 mm. The pressure arm is attached to the housing of the straightener.
The cylinder has seat valves which maintain the pressure in the cylinder if the hose breaks.
