Method and device to start laminating pilger a hollow mandrel plugged on a billet.

摘要

In the initial rolling of a hollow billet 16 the billet (16) is held against axial movement in the feed direction. This is accomplished using an abutment member (1) mounted relative to the roll stand (10) for movement into the roll gap from the side opposite the mandrel (15) upon which the billet (16) is borne. The abutment member (1) is held in its working position adjacent the plane containing the axes of the pilger rolls (14) during the initial rolling stage and then removed from the path of the rolled billet thereafter. The method reduces the high stresses suffered by the rolling mill. IMAGE