| 摘要 |
Reduction of bars or rods with reducing rolls of large diameter on arbors in which lateral pressure is applied to the reducing rolls to suppress rotation of the rolls relative to the arbor. The pressure is applied by an annular shoe on the arbor. The shoe and an annular fluid activator, on the arbor form, between their facing surfaces, a sealed annular chamber and also an annular gap. The gap is accessible through the peripheries of the activator and shoe. Axial movement of the activator outwardly of the rolls is restricted by a nut on the arbor. Grease is injected into the chamber under high pressure. The shoe and activator operate as a split cylinder impressing tensile stress on the arbor between the side of the shoe remote from the activator and the nut and causing the arbor in this region to elongate and also to impress compressive force on the roll and its axial components. This elongation enlarges the width of the gap. With the width enlarged, a split annular spacer whose width is greater than the unenlarged width of the gap but smaller than the enlarged width of the gap is interposed in the gap. The grease is then drained causing the arbor to retract and compress the spacer. The resulting lateral pressure is transmitted to the rolls to suppress their relative rotation. |
