Process for producing burr-free workpieces by blanking, in particular in a counterblanking tool

A process for producing burr-free workpieces by blanking using a counterblanking tool with an upper tool and a lower tool which include respectively an upper blanking die and a lower blanking die and an upper punch and a lower punch and which further includes a ram plate which moves one of said upper and lower tools towards the together of said upper and lower tools, wherein said ram plate moves in a continuous ram stroke, said process comprising:

• (a) clamping a blanking strip from which a workpiece is to be blanked between the upper tool and the lower tool;
• (b) keeping the blanking dies in a place and causing a first one of said upper and lower punches to travel in a first direction and a second one of said upper and lower punches to travel back along said first direction until said second one of said upper and lower punches reaches a first limit stop, during said travel said first one of said upper and lower punches cutting partly into the blanking strip;
• (c) applying a force after movement of said upper and lower punches stops and while said upper and lower punches are stationary such that a first one of said upper and lower blanking dies travels against a second limit stop and pushes the other of said upper and lower blanking dies so that aid upper and lower dies slide along the upper and lower punches and the second one of said upper and lower punches cuts the workpiece out from the blanking strip;
• (d) stopping and reversing the ram stroke of said ram plate so that the upper and lower tools are separated;
• and
• (e) pushing the workpiece out of said counterblanking tool.