FIELD: four- and six-roll stands of rolling mill, operation method of such stands.
SUBSTANCE: four-roll stand includes two rolling rolls and two backup rolls driven by means of drive spindles. Both backup rolls are joined through disconnection device with motor. Each rolling roll is provided with disconnection device for joining respective drive spindles with rolling rolls. When small-diameter rolling rolls are used, said devices are disconnected and there is no connection with motor. When large-diameter rolling rolls are used, they are joined through said devices with motor. Six-roll stand includes two rolling rolls, two backup rolls and intermediate rolls arranged between rolling rolls and backup rolls. Each backup or intermediate roll driven by means of spindle is provided with disconnection device joined with one or several motors. Each rolling roll is provided with disconnection device for joining respective drive spindle with rolling rolls. When small-diameter rolling rolls are used said devices are disconnected and there is no connection with motor. When large-diameter rolling rolls are used they are joined with motor. Combination type drive unit of four- or six-roll rolling stand provides joining of large-diameter rolling rolls directly with motor but small-diameter rolling rolls are driven only due to friction with adjacent backup or intermediate rolls. In order to provide selective operation of rolls in four-roll stand having first small-diameter rolling rolls and second large-diameter rolling rolls, motor drives to rotation only backup rolls in case of operation of small-diameter rolling rolls and only rolling rolls in case of operation of large-diameter rolling rolls. In order to provide simultaneous operation of small-diameter and large-diameter rolling rolls in four-roll stand, motor drives respective backup roll for operation of small-diameter rolling roll and only rolling roll itself for operation of large-diameter rolling roll. In order to provide selective operation of rolls in six-roll stand having first small-diameter rolling rolls and second large diameter rolling rolls, motor drives only backup and(or) intermediate rolls for operation of small diameter rolling rolls and only rolling roll itself for operation of large-diameter rolling roll. In order to provide simultaneous operation of small-diameter and large-diameter rolling rolls in six-roll stand, motor drives only respective backup and(or) intermediate roll for operation of small-diameter rolling rolls and only rolling roll itself for operation of large-diameter rolling roll.
EFFECT: rapid adjustment for rolled materials of different thickness and (or) hardness values, possibility of selective operation with small-diameter and large-diameter rolling rolls at lowered cost.
20 cl, 2 dwg
