Phase forming method: Phase forming method is a longitudinal formation method composed of a series of pair -pair -type rollers. It can also be classified according to the characteristics of the billet horizontal forming and the characteristics of the longitudinal forming of the tube.
(1) Classification according to the characteristics of horizontal molding: Bring steel During the continuous molding process, according to the trajectory of the horizontal cross -section plastic bending trajectory, it can be divided into the edge bending method of bending on the edge of the steel edge. The central curved forming method, the circular bending molding method of bending on the full width of the belt, and the double -radius hole -type bending molding method.
(2) Classification according to the characteristics of the vertical molding of the tube: Divide according to the distribution form of the bottom line of the forming pipe, and the forming of the welded pipe can also be divided into four types, namely the mountain forming method, downhill forming method, bottom line level method, and edge line level method. The stretching generated by the upper mountain molding method is the maximum: the vertical stretching strain generated by the downhill molding method is evenly distributed in the direction of the width of the pipeline, and the edge extension is minimized.
(3) Progress of phase molding method: At present, in the forming of straight welded pipes, such as W anti -curved bending forming method (the first few of the formal crews use the W anti -curved roller), F.F molding method (the front section of the formation is by 4 combinations by 4 combinations The more advanced forming methods such as the flat roller and the six cluster rollers) have played a positive role in improving the quality of molding.
