Blade for perforating sheet metal part e.g. door liner, of car in press, has peripheral portion including cutting edge, and recess allowing cavity to communicate with outer side of blade when cutting edge is in contact with sheet metal part

摘要

The blade (1) has a peripheral portion (2) including a cutting edge (2a) intended to come into contact with a sheet metal part (5) to be cut, where the peripheral portion surrounds a cavity (3). A recess (8) allows the cavity to communicate with an outer side of the blade when the cutting edge is in contact with the sheet metal part, where the recess is opened at bottom (3a) of the cavity. An extension piece (4) supports the blade, where the recess passes through the bottom of the cavity and extends into the extension piece.