Durma HRB-4 is developed to give the plates mostly a cylindrical and conical shape. The HRB-4 plate bending machines are renowned for transforming flat sheet metal into spherical body. It can also produce cone tube body and other various shapes. Once the material is set and pinched the two rolls on either side of the pinched roll do all the work. This is done without having to remove the plate and rotate it for pre bending both ends. They can roll big range thick plate steel. Therefore, they are most likely to be outfitted with CNC controllers for variable radii applications. Complex shapes such as elliptic and polycentric workpieces can be produced. Their greatest advantage is that they can be used on a wide range of sheet metals. They have high degree of automation. They can also be used to roll tube segments, ovals, rounded boxes and other shapes.
The side rollers are hydraulically driven by 4 powerful hydraulic cylinders. Synchronization between each other is achieved by measuring the very sensitive magnetic linear encoders. The commands are relayed in a millisecond to the PLC.
It has high-precision load check valves. Therefore, it does not lose its position even under extreme pressure.In HRB-4, the lower and upper rollers are driven with equal moment. It has an automatic compensation feature. Therefore, the speed differences between the lower and upper rollers are equalized. Thus, it does not cause power loss. Thanks to this system, bending operations are performed in fewer steps. Time saving is ensured.