GB1433452A - Rolling of seamless tubes - Google Patents

Abstract

1433452 Rolling tubes INNOCENTI SANTEUSTACCHIO SpA 22 Jan 1974 [23 Jan 1973] 03020/74 Heading B3M After a tubular bloom 1 supported on a mandrel has been rolled to a seamless tube in a mill A, the mandrel is cooled while remaining on the mill pass line, and then re-used for a following bloom. The initial bloom 1 is supported on rollers 1a and the mandrel fed through the bloom from the right (Fig. 1) until it couples with a crosspiece 5. During the subsequent rolling step, the crosspiece is fed to the right and the bloom reduced in the mill A. The mandrel remains in the mill when the bloom has been withdrawn to the right, and is cooled by passing water through cylindrical tanks 12 between the roll stands (Fig. 2). As the water cools the mandrel, vertically movable supports 11 support it in position. The mandrel is also supplied internally with coolant from a conduit 6 in the crosspiece 5, and with lubricant from a conduit 7. After cooling, the supports 11 are lowered (thereby opening water discharge openings in the tanks 12), the crosspiece moved to the left, a new bloom placed in position, and the mandrel fed through the bloom and into contact with the crosspiece, ready for a further rolling step. The mandrel is shifted by feed rollers 4, and the rolled tube by inclined rollers 8, located upstream of a further rolling mill 10.