Mandrel holder head with release device

摘要

A mandrel holder head with release/fastening device of the mandrel for rolling metallic tubes comprises a mandrel holder (1) which accommodates within an internal seat a half collar (2) of externally cylindrical shape through an opening in the side wall. In the internal seat are accommodated both an end part (52) of the mandrel shank and the half collar (2) through the opening. The half collar has an internal cavity with a second longitudinal side opening which accommodates a second part (51) of the shank of diameter smaller than that of the first part (52). The half collar is divided along an axial direction into two cylindrical parts (21, 22) which have different diameters. The locking member (30, 31) of the half collar (2) holds it in the mandrel holder (1) seat in working conditions, while allowing shank release with an axial movement in locked conditions.

主权项

1. A mandrel holder head adapted to releasably engage a mandrel used for rolling metallic tubes, where said mandrel has a first end part, having an outer diameter, an opposite end part having an outer diameter, and an intermediate part having an outer diameter, said outer diameters of said first and opposite end parts being greater than the outer diameter of said intermediate part, said mandrel holder head comprising:
a. a support member having a first cavity with a first lateral opening, said first cavity being adapted to receive said first end of the mandrel, and b. an intermediate member having a second internal cavity adapted to cooperate with said support member, said first cavity of said support member being adapted to receive said intermediate member where said cavities of said intermediate member and said support member have a common central axis,
said intermediate member having said second cavity with a second lateral opening oriented axially that is adapted to accommodate said intermediate part of the mandrel, and being adapted to selectively restrain said mandrel in said mandrel holder head or to be rotated about said central axis to allow removal of said intermediate member transversely of said central axis from said support member, followed by extraction of said mandrel from said support member in the direction of said central axis.