PURPOSE: To surely roll a sort tube stock with a simple means by introducing the tube stock into a rolling mill with rolls and a pre-reduction equipment and guiding rotation as a fixing clamper.
CONSTITUTION: This pre-reduction equipment 6 is composed of a plurality of rolls 7 which are disposed uniformly distributed around a tube stock 4 and which are adjustable toward the tube stock and freely rotatable. The equipment 6 is controlled by the position of the stock tube 4 wherein the adjusting movement of the rolls 7 is grasped. Thereupon, the tube stock 4 is introduced into a rolling mill 5 by moving the pre-reduction equipment 6 together with the rolls 7 holding the tube stock 4 in order to roll the short tube stock 4. Further, when the tube stock 4 is rolled by the rolling mill 5, the rotation of the tube 4 is guided as a fixing clamper by the rolls 7 of the pre-reduction equipment 6. Thus, disadvantageous points such as replacement of device elements required in the case of torsion and a different dimension of the tube stock are eliminated.
PAURU KEENEN