Automatic Tube Expanders Automa/Ultra

General Information

The series AL 82, KL 84, ALA 82 and KLA 84 are custom series, which are only manufactured upon the special request of the customer. The expansion of the tube is accomplished in all types by three or more cone-shaped rolls, which are pressed radially outwards by the axial shift of a similarly cone-shaped mandrel. Since the taper of the mandrel is twice as large as that of the rolls, the rolls grouped around the mandrel produce a cylindrical surface once again.

The axial shift of the mandrel is achieved in all automatic sealing machines by means of a thread. The feeding of the mandrel is naturally resisted by the rolls running along the interior surface of the tube. As the expanding mandrel is turned, this resistance is expressed as increased flank pressure in the thread of the expanding mandrel and the surrounding nut. As the flank pressure in the thread increases - i.e. increased thread friction - the expanding mandrel attempts to take the surrounding nut - threaded sleeve - with it as it turns. Uncontrolled turning of the nut sleeve is prevented by the coupling. The outer hexagonal nut enables the coupling surfaces to be pressed more or less tightly together by tightening with a greater or lesser force and, hence, to precisely control the disabling of the expanding mandrel feed - i.e. the expansion pressure.