Rolling mill stand

A stand of a continuous rolling mill for producing beams and similar sections including two horizontal and two vertical rolls, the stand being centered on the pass line of the beam to be rolled and having fixed roll housings in the rolling line for receiving a removable cassette for supporting said rolls and their chocks for each said rolls, the improvement comprising:

• hydraulic tightening jack means for a different chock of each horizontal roll, a said jack means located between a chock and associated housing and being supportable by an associated housing,
• servo-valve means for said jack means for supplying hydraulic fluid to said jack means from an hydraulic power means,
• linear position sensor means for each horizontal roll for producing a signal representative of the actual position during rolling of at least one associated jack means,
• pressure sensor means for producing a signal representative of the working pressure of at least one of said jack means for each horizontal roll, and
• control means including means for producing signals representing the modulus for each portion of the stand associated with a different horizontal roll, means for receiving said pressure sensor signals and combining them with the modulus signal for the same stand portion to produce position reference signals for each horizontal roll, means for receiving said linear position signals, and means for comparing said corresponding position reference signals with said corresponding signals representing the actual positions of corresponding jack means for said horizontal rolls to generate command signals for operating said servo-valve means for said jack means for each roll for maintaining a constant web thickness and a symmetrical web position relative to a flange portion of the beam.