| 摘要 |
<p>The invention relates to an apparatus (2) for shaping generally cylindrically shaped objects, (5), for example cans, containers and pipes. The invention is particularly intented for forming necks or other kinds of annular indentations or projections in such objects. The apparatus comprises a rotatable mandrel (6) and a roller (8) the outer periphery of which forms a generally circular rolling surface (9) opposite the mandrel (6), at least a portion of the rolling surface comprising a cam surface (9A) whereby when the roller rotates the distance between the cam surface and the mandrel varies.</p> |
