Compared to the classic hydraulic solution, these electric drives offer numerous advantages in terms of robustness, safety, and operating convenience. They are also easier to maintain and run more efficiently to save cost.
More Efficient Bending With Parallel Shaft Gear Motors
Case Study from | NORD DRIVESYSTEMS
The Swedish machine manufacturer Comeco has revised the drive concept of its rebar bending machines and equips this next generation equipment with electric drives from NORD DRIVESYSTEMS. Compared to the classic hydraulic solution, these electric drives offer numerous advantages in terms of robustness, safety, and operating convenience. They are also easier to maintain and run more efficiently to save cost.
Comeco produces rebar bending machines with different diameters for construction companies and construction machinery rental companies. Working with NORD DRIVESYSTEMS, the company has retrofitted a series of their rebar bending machines with electronic drives. These machines can bend rebar with diameters of up to 20 mm. Comeco is also planning to retrofit another series for diameters of up to 40 mm.
Comeco did extensive research to find ways to make their machines more robust and cheaper to build, without compromising on quality. For this new machine generation, all functions needed to be controlled by a PLC, so NORD proposed a drive with the NORDAC FLEX variable frequency drive. With its internal PLC, this motor-mounted, decentralized VFD offers precise speed control and positioning. Depending on their skill level and the thickness of the steel bar, operators of the bending machine can select from two speed settings. The 20 mm machine can also be programmed to handle two angles at a time and operators can go from one setting to the other via a convenient switch button. The configured parallel shaft geared motors deliver high torques with a very small footprint.
NORD delivered pre-assembled, pre-programmed drives, each with a ParameterBox that Comeco installs into the machine operation panel. Instead of the complex wiring of a hydraulic control system, the electronic drives only require a power connection. As soon as the start button is pressed, the machine actuates the set angle. After the bending process is complete, the PLC reverses the drive and returns to the initial position so the finished steel bar can be removed easily and safely.
Comeco’s new benders with NORD drives are easier to operate than the hydraulic machines that they had previously produced. The design is so intuitive that each customer or workshop can handle any troubleshooting themselves – although this is a very rare occurrence due to NORD’s reliable design.
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