Assembly of the block of drawing has a single groove

摘要

P the invention relates to a drawing block with a single groove. This drawing block has a single groove intended to receive the tube and to exert on the one - latter, a stretching tension. This groove is defined starting from a plane perpendicular to its main axis, by a continuous circular opening formed in the block about this axis. The opposite surfaces of this opening converge towards the center of the block and have continuous curvatures. The angle of spacing of the opposite surfaces, measured in diametrically opposite points, which varies progressively from the top to the outer end of the opening. The present invention applies to the drawing of the metal tubes. / p