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14.12.2022

Servo direct drive – The time is right

Hatebur has laid the foundations for the development of the servo direct drive with experience in servo-driven functions over the last 20 years.

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This means it is possible to combine a high level of dynamics with excellent performance, where the mechanically stored energy of all machine components in motion is taken into account. This type of design enables servo technologies to be used for the main drive, thereby opening up a new field in press technology. 

A disadvantage of mechanical drives is that it is very laborious to adapt the sequences of movements. For local drive technologies, such as servo motors, machines can be upgraded and improved with new functions, even after years of operation. The prerequisite for this is selecting components that take into account possible future requirements. The Hatebur COLDmatic CM 725 with direct drive offers the same forming performance as the standard machine, yet the movement of the pressram can be adapted to the process in a large area. The press can be used in a more universal way and can be adapted more accurately to the requirements of the customer and the respective processes.

Advantages for operators

Some of our operators have already been up close and personal with the new drive. Their experiences are overwhelmingly positive. Many advantages become clear as soon as the machine is set up. The direct drive can be moved more easily and subtly, and behaves more predictably in its response characteristics than the conventional main drive. A further highlight is the hand wheel. It gives a better feeling for the machine, whereby positioning and exactly setting the timing is further improved.

Saving tooling time

An additional advantage of the drive concept is that parts can be formed in set-up mode whilst the punching positions and timing are being fine-adjusted. The time-consuming acceleration and deceleration of the flywheel is also no longer necessary, saving tooling time when setting up a new part.

The direct drive is more than simply a replacement for the conventional drive. With this option, all local drives relate to a virtual guiding axis, which prevents the movements negatively impacting each other by overlapping. The advantage here is that the movements of all locally driven assemblies are executed cleanly and accurately.

Reducing energy loss

With the direct drive, the required energy is stored in capacitors instead of a flywheel. This not only keeps the machine’s connected load low, but also significantly reduces energy loss during set-up. While the total stored energy is lost when the flywheel shuts down, with the direct drive it remains stored in the capacitors and is available again immediately. 

Your advantage

  1. Process-related sequences of movements
  2. Continuous optimization
  3. Fast set-up when forming at the setting speed
  4. Hand wheel for intuitive machine operation
  5. Improved position accuracy
  6. Better ergonomics when setting up