Rohrbiegevorrichtung- und verfahren

摘要

The improved process for rotary draw bending a tube involves contacting the tube with a pressure die to provide frictional contact, and subjecting the tube to a bending torque to bend the tube and effect movement of the tube. A longitudinal pressure boost is applied to the pressure die at a speed according to a pre-programmed speed profile. A perpendicular reaction force is applied to the pressure die to maintain the frictional contact. A pre-programmed friction profile of the tube and the pressure die interaction are provided. Any change in the speed of the pressure die is measured relative to the tube. The boost pressure acting on the pressure die follows a pre-selected boost profile. The reaction force is automatically changed in response to the change in the relative speed of the pressure die to maintain the friction profile.