Patent EP-0756906-A1 (EP)
Inventor: CIANI LORENZO
IPC: B21B38/06
Filed: 1996-07-25
Abstract: Method to control between rolling stands the drawing of the rolled stock (14) in a segment (10) of a rolling line, the segment (10) possibly comprising two conventional rolling stands with or without an interposed drawing unit (19), a conventional rolling stand and a drawing unit (19), a rolling stand and a fast rolling block (11a), two fast rolling blocks (11a, 11b) with an intermediate thermomechanical treatment or another type of combination of rolling units, there being included a possible intake drawing unit (12) and a possible discharge drawing unit (13) associated with a shears (20), the method including the measuring of the drawing action applied to the rolled stock (14) in the segment between stands comprised between two rolling units, one upstream (11a) and the other downstream (11b) and/or between a rolling unit and the relative drawing unit (19), the measurement of the drawing action being achieved by means of a dimensional measuring of a significant dimension of the rolled stock (14) carried out at at least two points of the segment (10) between stands, at least one of which points is placed immediately at the discharge of the upstream rolling unit (11a), the measurements then being compared and the result of the comparison being correlated to the value of the drawing action exerted on the rolled stock (14) by an actuating and control unit (18) with a consequent possible correction in feedback of the working parameters of the drawing unit (19) and/or the downstream rolling unit (11b) and/or upstream rolling unit (11a) so as to maintain the drawing action on the rolled stock (14) at a desired constant value in the long term. 
Device to control between rolling stands the drawing of the rolled stock (14) in a segment (10) of a rolling line, the segment (10) possibly comprising two conventional rolling stands with or without an interposed drawing unit (19), a conventional rolling stand and a drawing unit (19), a rolling stand and a fast rolling block (11a), two fast rolling blocks (11a, 11b) with an intermediate thermomechanical treatment unit (15) or another type of combination of rolling units, there being included a possible intake drawing unit (12) and a possible discharge drawing unit (13) associated with a shears (20), there also being included at least between the upstream rolling unit (11a) and the downstream rolling unit (11b) and/or the drawing unit (19) a measurement device (16) to measure the drawing action imparted to the rolled stock (14) in the segment (10) between the stands, the measurement device (16) comprising at least two measurement units (17a, 17b) to measure the most significant real dimension of the rolled stock (14) as it passes through, of which at least the first (17a) is disposed immediately at the discharge of the upstream rolling unit (11a), the measurement device (16) being associated with the actuation and control unit (18) comprising means to correlate the at least two dimensional measurements to the value of the drawing action exerted on the rolled stock (14) and comprising means to correct in feedback the working parameters of the rolling unit (11a, 11b) and/or drawing unit (19) suitably for the maintaining of a desired and constant value of drawing action in the long term.