Punching press device for punching openings in profiled bars, and method of punching

摘要

A method and devices are disclosed for punching one or more holes in extruded hollow profiled bars (50; 70; 270) where a back-up matrix (42; 150-550) must be inserted and located in precise alignment with the punching male punch (66; 90) die. Accordingly, the matrixes are mounted to portable mandrel rods (40; 140) provided with settable stop brackets (44; 146). The rods are placed in their exact operative punching position, and removed therefter for processing the next bar. The method further provides for simultaniously punching holes in more than one wall of the profiled bars.