Method to eliminate the play between chocks and relative support blocks in four-high rolling stands and relative device

A device to eliminate play between a chock and a support block in a four-high rolling stand,

• the rolling stand comprising
• working rolls on respective first chocks,
• back-up rolls on respective second chocks,
• support blocks to support the chocks,
• a stationary housing having uprights,
• the support blocks being arranged between the uprights of the stationary housing and the relative chocks,
• supporting means for lateral crossover displacement of the working rolls and backup rolls, the supporting means including an actuator acting on at least one member of the group consisting of at least one of the first chocks and at least one of the second chocks,
• transmission means including a hydraulic cylinder to transmit a thrust acting on at least one second chock on a longitudinal median plane of the stand opposing a rolling thrust,
• the device comprising:
• a processing and control unit configured to define a theoretical value of inward deflection of the uprights of the housing according to a value of the rolling thrust and to define an amount of play resulting from the inward deflection, with the uprights in this condition of deflection, between each chock and relative support block during crossover movements of the first chocks and the second chocks, and
• a displacement means, governed by the processing and control unit, which act on a relative said support block to displace the support block towards the relative chock during rolling passes to minimize the play to a desired value.

A device to eliminate play between a chock and a support block in a four-high rolling stand, comprising:

• the rolling stand comprising
• working rolls on respective first chocks,
• back-up rolls on respective second chocks,
• support blocks to support the chocks,
• a stationary housing having uprights,
• the support blocks being arranged between the uprights of the stationary housing and the relative chocks,
• supporting means for lateral crossover displacement of the working rolls and backup rolls, the supporting means including an actuator acting on at lease one member of the group consisting of at least one of the first chocks and at least one of the second chocks,
• transmission means including a hydraulic cylinder to transmit a thrust acting on at least one second chock on a longitudinal median plane of the stand opposing a rolling thrust,
• a processing and control unit configured to define a theoretical value of inward deflection of the uprights of the housing according to a value of the rolling thrust and to define an amount of play resulting from the inward deflection, with the uprights in this condition of deflection, between each chock and relative support block during crossover movements of the first chocks and the second chocks, and
• a displacement means, governed by the processing and control unit, which act on a relative support block to displace the support block towards the relative chock during rolling passes to minimize the play to a desired value.