| 摘要 |
<p>The main body of the punch, namely base portion (20) and support portion (19), is formed as an extruded profile, e.g of aluminium. Respective end plates (11, 12), e.g. of moulded plastics, are preferably fitted thereto to maintain overall strength and rigidity so that the thickness of the extruded material can be reduced. The length of the extruded profile and the positioning of openings (42, 43) for cutting tools (15) can be varied without the need for new production moulds, thereby simplifying and reducing the cost of production of a range of different sizes of punch. …<??>The main body of the punch may alternatively be formed of two or more extruded profiles. …<??>Press bar (14) may also be formed as an extruded profile.</p> |
