HRB-4 Series
4 Roll Hydraulic Roller
GENERAL INFORMATION
The Durma HRB-4 Roll Hydraulic Rolling Machine offers a versatile, fast and safe machine, ideal for bending sheets from 3 to 150mm thickness up to a useful length of 8000mm.
This accurate, easy to operate, 4-roll plate roller allows for double pre-bending (both ends of the plate) in one pass. This is the most suitable configuration for CNC applications like elliptical bending.
- Accurate, ease of operation, fast roll bendings
- Flat zone of the sheet edges is minimised
- Pre-bending, conical bending and ellipse bending can be done easily
- Double pre-bends (both ends) in one pass
- Hydraulic and electrical systems have been safeguarded from overloads and require minimum maintenance
- Hydraulic and electrical components are modular and designed according to world standards
- The sheet is controlled by the tightening of top and bottom rolls
- Most suitable bending operation for CNC applications
- More efficient for cycle times
- User friendly operation
FEATURES
Robust Machine Body
The machine body is strengthened and lowered to minimise twisting and deformation. All components of the machine frame including the cross members are stress relieved after welding.
Planetary Swing Roll System
The side rolls are 2 independent axes which swing up in an orbit motion. The orbit motion allows perfect pre-bends as well as minimises spring back. This allows a DURMA machine to roll a drum as small as 1.1 times the top roll diameter.
Bearing System
The rolls are guided with roller bearings within bronze housings. This guiding system requires less lubrication with long term durability.
Synchronized Roll System
The bottom roll pinches the different plate thicknesses without deformation. The pinching rolls maintain parallelism by the hydraulic adjustable pressure torsion bar.
High Torque Drive System
DURMA plate rolls produce extremely high torque. Therefore you can bend the plate with fewer steps. The top and bottom rolls are powered by hydraulic motors through a planetary reduction gearbox. The strong hydraulic brake system does not allow the plate to slip back. Pressure safety valves protect the hydraulic system from overload.
Electrical and Electronic System
Only world leading electrical and electronic components are used in DURMA machines. The system has current overload protection components integrated into it.
Conical Bending System
Because of the strong machine frame, DURMA plate rolling machines boast conical bending capacities of 1.5 times the top roll diameter. Most other machines in the market can only achieve 3 times the top roll diameter.
Digital Readout
As standard the DURMA range of 4—roll plate rolling machines have a digital readout display. The operator can quickly and easily view the position of up to 6 moving axes.
Hardened Rolls And Crowning System
Highly durable carbon steel (C45) rolls are machined by CNC lathes with high precision without creating a notch effect. Working surfaces of the rolls are induction hardened to HRC 54±2. Rolls are machined as crowning shapes to compensate the deflections on the rolls during bending.
Hydraulic System
Only world leading hydraulic valve components are used in DURMA machines. This ensures precision movements of all axes and high response speeds. The hydraulic system has pressure safety valves to protect the system from overload.
OPTIONAL FEATURES
- NC control unit
- CNC control unit – colour – graphic control
- Polished rolls
- Variable speed control
- Oil coolant
- Side supports on both sides
- Vertical support crane system (mechanical or hydraulics)
- Changeable top roll for smaller diameters
- Longer rolls for profile bending
- Welding possibility on the machine
- Preparation for vertical support crane system
- Material feeding table
- Special applications for wind-tower production
Top Support
- 3M x 4 ton hydraulic
- 4M x 4 ton hydraulic
- 6M x 4 ton hydraulic
- 3M x 6 ton hydraulic
- 4M x 6 ton hydraulic
- 6M x 6 ton hydraulic
Side Support System
Roll Options
Polished rolls
Additional top roll
Material Feeding Table
Motorised – L=3
CNC CONTROL UNIT
NC Control Unit S530
CNC Control S500 - Colour Graphics
CNC Control S500 - Colour Graphics
DATA SHEET
