Press brake combines hydraulic, AC servo characteristics

June 13, 2006

The Toyokoki HYB press brake from MC Machinery Systems Inc. combines the characteristics of hydraulic brakes with AC servo brakes.

Although the press brake uses hydraulic pressure to move the ram, the oil is delivered by an AC servomotor pump that does not rely on valve operation for control and is not subject to variations in oil temperature and pressure. The press brake achieves a repeatability of 5 microns (0.0002 in.).

Lower bed crowning on the press brake is controlled by a double wedge system that is adjustable across the entire bed. The control automatically sets the amount of crown. When fine-tuning is necessary, the crown automatically adjusts to correct the bed to match angles.

The unit controls ram speed and positioning with 1-micron resolution scales the read ram position 1,000 times per second. Feedback is sent to the ram AC servomotors to help ensure that the ram velocity is constant and no overtravel can occur.