Coiling machine for hot rolled stock such as strip or sheet and relative coiling method

A method for coiling hot rolled products such as strip or sheet with a thickness of between 0.5 and 5 mm, the method using a coiling machine having a turntable assembly (12) rotating around a central axis of rotation (13) parallel to the plane of feed (14), two coiling mandrels (15a, 15b) mounted rotary on the turntable (12) on diametrically opposite sides with respect to the central axis of rotation (13) and with their axes of rotation parallel to the central axis of rotation (13), and an assembly (23) to guide the strip suitable to cooperate selectively with each of the mandrels (15a, 15b), the turntable assembly (12) being able to assume, by rotating, a first angled position wherein a first mandrel (15a or 15b) is in correspondence with the plane of feed (14) and ready to receive the leading end of the rolled stock and to begin coiling, wherein the assembly (23) to guide the strip comprises a plurality of wrapper rollers (24) operating directly on the rolled stock and having their axes of rotation parallel to the central axis of rotation (13) and arranged along an ideal circumference beyond the area occupied by each of the mandrels (15a, 15b) so as to define a circular guide path for the leading end of the rolled stock around the mandrel which is temporally in correspondence with the plane of feed (14), the assembly (23) to guide the strip is normally arranged in a first inactive position outside the turntable assembly (12) and is selectively movable to a second working position, associated with the first angled position of the turntable (12), in which the assembly (23) to guide the strip is suitable to cooperate with the leading end of the rolled stock to guide the leading end of the rolled stock around the first mandrel (15a or 15b), comprising

• initially coiling the leading end of the rolled stock, so as to obtain a desired number of spirals, onto a first mandrel (15a) placed in a position of substantial cooperation with the plane of feed (14),
• then rotating the turntable assembly (12) by 180° and completing coiling with the first mandrel (15a) placed in the rotated position,
• when the coil (30) is completed the rolled stock is sheared, the completed coil (30) is discharged and coiling is started on the second mandrel (15b) placed in a position of cooperation with the plane of feed (14).