In the production of LSAW pipes and pipe sections, the Graebener® pre-bending presses carry out the first bending step of the steel plates. The plate edges are pre-bent prior to the downstream bending process so that the straight plate ends of bent pipes are reduced to a minimum.
Based on our many years of experience as former manufacturer of LSAW pipes we offer customized pre-bending solutions as special machine builder. Depending on the type of application and your individual requirements we use two different methods of pre-bending: in case of plates with a wall thickness of 150 mm both plate edges are pre-bent subsequently over the entire plate width. In case of plates with a smaller wall thickness of up to 75 mm a step-by-step process is used where both plate sides are pre-bent simultaneously in several steps throughout a length of up to 20 meters.