GB1027704A - Improvements in rolling mills - Google Patents

Abstract

1,027,704. Rolling. F. MOELLER and K. NEUMANN, [trading as VERWALTUNGSGESELLSCHAFT MOELLER UND NEUMANN OFFENE HANDELSGESELLSCHAFT]. May 8, 1964 [May 8, 1963], No. 19232/64. Heading B3M. [Also in Division G3] A control arrangement for setting the roll gap in a rolling mill comprises a tube 21, attached to an upper backing roll chock 2, and slidable in a tube 22 which is attached, by way of an integral tube 23, with the lower backing roll chock 3 of the mill. The tube 21 has attached to it a transformer 27 and the lower tube 22 a core 28 such that relative movement of the tubes, due to a change in the rolling gap, causes an output from the differential transformer at 34. The tubes which are urged apart by a spring 25, are attached to the chocks 2 and 3 by pins 12 which extend along the axis of rotation of each chock about which the chock rotates when the rolls deflect. The core 28 is attached to a shaft 29 whose height is controlled by an electric motor 32 acting on a recirculatory nut mechanism 31. In operation, the position of the core is first adjusted to give zero output with a desired roll gap. During rolling any signal received at 34 is used to control the fluid pressure on a ram 16 (Fig. 1, not shown) such that the rolling gap is returned to its desired value in which the transformer output is zero. Elastic deformation of the mill under pressure, and also changes in the roll gap due to wear or heating of the rolls may be compensated for. The output from the transformer may alternatively be used to control the screwdown 7 but a prestressing arrangement is preferred. A pull out sled 17, 18 allows withdrawal of the roll assembly for roll changing.