Punching holes into hollow profiles - using two steps first to cut part hole, second to complete hole, clean-up edges, withdraw tool

摘要

The method is for the punching of round holes into closed hollow profiles, esp. tubes with circular profile. The tube(2) is held on the circumference. In a first step, a punching die(6) presses a part hole into the tube wall(2a). The die is then turned within the tube through 90 deg. around its punching axis (A). In a second step, the die is withdrawn from the tube. In the same step, it cuts away the remaining tube wall parts of the part hole, and reforms the edge sections, which were moved into the tube during formation of the part hole. USE/ADVANTAGE - Simple and economical punching of hole without insertion of die into tube, achieves clean hole with edge aligned with tube.