Machine for continuous bending long bars or tubes - has bends with varying radius of curvature program controlled

摘要

The bar or tube (1) which is to be bent is passed through a set of rollers (2) (3)(4)(2')(3')(4') which are driven by an electric motor. The bar or tube (1) then passes through an induction heater (9) controlled by a transformer (10). A cooling ring (H) which directs jets of water on air on the workpiece (1) is attached to the side of the heater (9). A sliding carriage (5) supports a cross-slide (6) which supports a rotatable chuck (7) which grips the end of the workpiece (1). By controlling the speed of the carriage (5) and of the cross-slide (6) the bending moment applied to the workpiece can be controlled. This bending moment produces plastic bending in the workpiece as it passes through the heater (9).