| 摘要 |
<p>A tube expander of the type using an expansion die (11) comprised of segments (11A and 11B) for insertion into the end of a tube (20) to expand the diameter of the end of the tube (20) which is characterized by the insertion of the expansion die (11), which has a forward end (18), into the end of the tube (20) with the forward end (18) situated at the innermost part of the required expansion, expanding the forward end (18) of the expansion die (11) to produce a circular ridge (21) in the tube (20) and then pulling the expansion die (11) towards the end of the tube (20) to expand the tube (20) along a required length thereof, the reaction to the pulling procedure being taken by having the end of the tube (20) resting against a reaction face (7) on radially movable jaws (2) situated in a head (1), the head (1) being stationary in relation to the expansion die (11), the expansion die (11) being expanded and moved by a pull rod (8). </p> |
