| 摘要 |
<p>The punched-out surface of a work is improved by heating a punching blade. A punching die punches out the work to be punched out which is disposed between upper and lower surface plates (91, 92) by a punching die (1A) installed on at least one of the upper and lower surface plates (91, 92). A heater (13) for heating the punching blade (12) is installed in the punching die (1A). The heater (13) can be constituted by use of a heating wire, an infrared heating device or the like. The heating wire uses an approximately 10-110 V direct current or an alternating current with proper frequency.</p> |
