Method to adjust the drawing action on a bar and corresponding device

A method to adjust the drawing action on a bar (11) in a rolling and/or finishing train (12) to obtain a final product, said train (12) comprising a plurality of stands (13) provided with rolls (14) configured to be driven by respective drive members (15) with a desired torque value and to define a feed path (P) for said bar (11), said adjustment method providing at least a step of setting operating parameters of said stands (13) and a step of adjusting said operating parameters to obtain said final product, said parameters being acquired with acquisition means (16) present in said train (12) or associated with one or more components of said stands (13), wherein said setting step provides to determine a reference torque value of each of said stands (13) during the feed of an initial segment of said bar (11) and in relation to said final product to be obtained, and wherein said adjustment step is started after a leading end (17) of said bar (11) has exited from the last of said stands (13),

• wherein said reference torque value of the i-th stand (Gi) is determined after a leading end (17) of said bar (11) exits from said i-th stand (Gi), and wherein said reference torque value of said i-th stand (Gi) is calculated by subtracting from the total torque value of said stands (13), after said leading end (17) of said bar (11) has exited from said i-th stand (Gi), the total torque value of said stands (Gi) before said leading end (17) of said bar (11) has entered said i-th stand (Gi).