| 摘要 |
<p>An apparatus for use in the production of cans, especially those shaped by stretching a sheet metal, the edge region of the can so produced requiring trimming and annealing treatment to facilitate forming an edge flange, comprises can retainers (6a) which are rotatable at an adjustable speed about the axis of the can retained thereon and a laser beam (33) for effecting at least the trimming treatment. The laser beam is directed at the region (56) of the cans (8) where trimming is to be effected and a displaceable protective gas hood (48) comprising an inner (50) and an outer (49) portion, which in use overlaps the edge (47) of the can to be treated is provided with a window (58) through which the laser beam passes. The table 1 may be rotated past the laser or a separate laser is provided for each can, a mirror 34 deflecting the beam during loading etc. The area 57 may be annealed by an electrical induction heater 9 or by laser beams 61 parallel to the 'sharp' cutting beams 60. <IMAGE></p> |
