Patent EA-001059-B1 (EA)
Title: Coiling machine for rolled stock such as strip or sheet and relative coiling method
Inventor: DRIGANI FAUSTO
IPC: B21C47/34
Filed: 1998-07-13
Abstract: 1. Coiling machine to wind hot rolled stock such as strip or sheet with a thickness of between 0.5 and 5 mm, arranged downstream of a rolling train (100) and a shears assembly (11) from which the rolled stock emerges along a plane of feed (14), wherein the coiling machine comprises 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, the coiling machine being characterised in that 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 it is suitable to cooperate with the leading end of the rolled stock to guide it around the first mandrel (15a or 15b). 2. Coiling machine as in claim 1, characterised in that the turntable assembly (12) is suitable to assume, by rotating, a second angled position, rotated by 180 degree  with respect to the first angled position, in which a second mandrel (15b or 15a) is in correspondence with the plane of feed (14) ready to receive the leading end of the rolled stock and to begin coiling, while the first mandrel (15a or 15b) is at the same time in a position wherein the coil (30) is completely coiled and ready to be discharged, the assembly to guide the strip (23) being suitable to assume the inactive position during the rotation of the turntable assembly (12) from the first to the second angled position and vice versa. 3. Coiling machine as in claim 1 or 2, characterised in chat there are at least three wrapper rollers (24) and have their axes arranged substantially at 120 degree  along the ideal circumference, and that at least one of the wrapper rollers (24) can be selectively distanced from the ideal circumference to allow the mandrel (15a, 15b) to be arranged between the said wrapper rollers (24). 4. Coiling machine as in claim 3, characterised in that the wrapper rollers (24) are mounted on corresponding oscillating arms (26) connected to actuators (27) suitable to take them selectively far from the position of cooperation with the periphery of the respective mandrel (15a, 15b). 5. Coiling machine as in claim 2, wherein each of the mandrels (15a, 15b) is provided with its own rotation shaft (36), characterised in that at least an assembly to support the mandrel (31) is provided to cooperate with the rotation shaft (36) of the mandrel (15a or 15b) which is in the position wherein the coil (30) is completed and discharged, the "assembly to support the mandrel (31) being movable from an inactive position and a working position wherein it cooperates with the shaft of the mandrel (36). 6. Coiling machine as in claim 5, characterised in that the assembly to support the mandrel (31) comprises an arm (35) movable axially and including at the end support elements of the fork-type, hand-type or saddle-type, to support the shaft of the mandrel (36). 7. Coiling machine as in claim 2, characterised in that at least a coil support assembly (32) is provided to cooperate from below with the coil (30) being formed in the position wherein the coil (30) is completely coiled and ready to be discharged, the coil support assembly (32) being movable and including a first inactive position and a second position of cooperation with the coil (30). 8. Coiling machine as in claim 7, characterised in that the coil support assembly (32) comprises a pair of rollers (40) associated with a movable trolley (39) and with a lifting actuator. 9. Coiling machine as in claim 2, characterised in that at least an assembly (33, 34) to make coiling regular and uniform is provided to cooperate with the periphery of the coil (30) being formed in the position wherein the coil (30) is completely coiled and ready to be discharged from the mandrel (15a, 15b), the assembly (33, 34) to make coiling regular and uniform being movable and including a first inactive position and a second position associated with the periphery of the coil (30) being formed. 10. Coiling machine as in claim 9, characterised in that the assembly (33, 34) to make coiling regular and uniform comprises an oscillating arm with a roller at the end. 11. Coiling machine as in any claim hereinbefore, characterised in that a roller-way (16) is provided downstream of the shears assembly (11) and is suitable to assume a first retractable position and a second position cooperating with the plane of feed (14), the roller-way (16) extending beyond the turntable assembly (12). 12. Coiling machine as in claim 1, characterised in that at least one movable guide blade (20a) rotatable on the plane orthogonal to the rolled stock is arranged between the shears assembly (11) and the turntable assembly (12) and includes a first position of exclusion far removed from the plane of feed (14) and a second working position cooperating with the plane of feed (14). 13. Coiling machine as in claim 1, characterised in chat two guide blades (20a, 20b) rotatable on the plane orthogonal to the rolled stock are arranged becween the shears assembly (11) and the turntable assembly (12) and cooperate respectively from above and from below with the plane of feed (14), at least one of the guide blades being able to be moved from a first position of exclusion far removed from the plane of feed (14) and a second working position cooperating with the plane of feed (14). 14. Coiling machine as in claim 13, characterised in that the surfaces of the guide blades (20a, 20b) facing the plane of feed (14) comprise means (22) to emit a jet of air or liquid towards the rolled stock in the segment between the shears assembly (11) and the turntable assembly (12). 15. Coiling method for hot rolled products such as strip or sheet with a thickness of between 0.5 and 5 mm, the method using a coiling machine (10) as in any claim hereinbefore, the method being characterised in that the leading end of the rolled stock is initially coiled, 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 the turntable assembly (12) is rotated by 180 degree  and coiling is completed 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). 16. Method as in claim 15, characterised in that for rolled stock of more than 5 mm thick, the turntable assembly (12) is taken to a third position with both mandrels (15a, 15b) placed in a position of exclusion from the plane of feed (14) and the rolled stock is made to pass downstream on the rollerway (16) placed in a working position cooperating with the plane of feed (14). 17. Method as in claim 15 or 16, characterised in that when one of the mandrels (15a or 15b) is taken from the first operating position, cooperating with the plane of feed (14) , wherein it is waiting for the leading end of the rolled stock and coiling is started, to the second operating position, rotated by 180 degree  with respect to the first operating position, wherein coiling is completed and the coil (30) is discharged, the assembly to support the mandrel (31), the assembly to support the coil (32) and the assembly (33, 34) to make coiling regular and uniform are taken from an inactive position to a working position cooperating respectively with the shaft of the mandrel (36), with the coil (30) from below and with the circumferential periphery of the coil (30) itself.