Cold rolling mill comprising a side-shift system

A 4-High or 6-High cold rolling mill, configured for rolling a metal strip, comprising:

• a rolling mill stand comprising, at a front side, a first pair of posts and, at a rear side, a second pair of posts,
• an upper work roll comprising a roll table configured to come into contact with an upper surface of the metal strip and two guide ends,
• a lower work roll comprising a roll table configured to come into contact with a lower surface of the metal strip and two guide ends,
• an upper backup roll, configured to transmit a clamping force to the upper work roll, directly according to a contact line between the upper work roll and the upper backup roll, or indirectly via an upper intermediate roll by a first bearing line between the upper backup roll and the upper intermediate roll and a second bearing line between the upper intermediate roll and the upper work roll,
• a lower backup roll, configured to transmit a clamping force to the lower work roll, directly according to a contact line between the lower work roll and the lower backup roll, or indirectly via a lower intermediate roll by another first bearing line between the lower backup roll and the lower intermediate roll and another second bearing line between the lower intermediate roll and the lower work roll,
• two upper chocks arranged at the two guide ends of the upper work roll, the two upper chocks including a first upper chock interposed between the two posts of the first pair of posts, and a second upper chock interposed between the two posts of the second pair of posts,
• two lower chocks arranged at the two guide ends of the lower work roll, the two lower chocks including a first lower chock interposed between the two posts of the first pair of posts, and a second lower chock interposed between the two posts of the second pair,
• an adjustment system configured to adjust a side shift configured for implementing a side shift, viewed according to a rolling direction between, on one hand, an axis of the lower work roll or respectively of the upper work roll and, on another hand, an axis of a roll bearing on the work roll consisting of the lower or upper intermediate roll when the rolling mill is a 6-High rolling mill, and consisting of the lower or upper backup roll when the rolling mill is a 4-High rolling mill, the adjustment system comprising:
• a first left pushing mechanism between a left one of the posts of the first pair, on one hand, and the first upper chock and first lower chock set, on another hand, configured to exert a pushing force on the first upper chock and first lower chock set to move said set in a first way according to the rolling direction,
• a first right pushing mechanism between the other right one of the posts of the first pair, on one hand, and the first upper chock and the first lower chock, on another hand, configured to exert a pushing force on the first upper chock and first lower chock set to move said set in a second way according to the rolling direction,
• a second left pushing mechanism between a left one of the posts of the second pair, on one hand, and the second upper chock and second lower chock set, on another hand, configured to exert a pushing force on the second upper chock and second lower chock set to move said set in the first way according to the rolling direction,
• a second right pushing mechanism between the other right one of the posts of the second pair, on one hand, and the second upper chock and second lower chock set, on another hand, configured to exert a pushing force on the second upper chock and second lower chock set to move said set in a second way according to the rolling direction,
• wherein the first left and right pushing mechanisms, and the second left and right pushing mechanisms comprise all or part of rotary helical pushing devices, each rotary helical device comprising a first part bearing on one of the posts for the first pair or respectively bearing on one of the posts for the second pair and a second part configured to laterally push the first lower and upper chocks or respectively to respectively push the second lower and upper chocks, and
• wherein the first part and the second part of each rotary helical pushing device are configured to pivot relative to one another, about an axis of rotation under action of an actuator, the first part and the second part comprising helical guide surfaces arranged around said rotation, bearing on each other, configured to cause a spacing of the second part relative to the first part in a direction of the axis of rotation, upon a relative rotation between the first part and the second part.