METHOD FOR PRODUCING BY REPOUSSE WORK OF A METAL SHEET BENT PIPE,WITH A THIN WALL AND WITHOUT A JOINT BEAD,SPECIFIC RADIUS OF CURVATURE,OPENING ANGLE AND PIPE DIAMETER,WITH OR WITHOUT TERMINAL CYLINDRICAL ENDS,FROM A THICK WALL TUBULAR BLANK,AND MACHINE FOR IMPLEMENTING SUCH METHOD

摘要

Method and machine for implementing such method for producing by repousse work a sheet metal elbow pipe having a thin wall, with no welding bead and no bending line, with specific radius of curvature, angle of opening and diameter of the pipe, from a thick wall short tubular blank. The blank (25) is positioned on an arcuated core (24) corresponding to the desired radius of curvature, between the press rollers (15) mutually adjustable and radially arranged on a head (4). The core (24) pivots according to the desired radius of the arc without rotating on itself, to allow the lamination of the blank (25) by rotation of the rollers (15) about the piece to be machined to form the angle of bent pipe (33) to the desired length, with a thickness of the wall comprised between 0.2 and 1.5 mm approximately.