STANZE MIT EINEM IN DER SEITENANSICHT LIEGEND U-FOERMIGEN MASCHINENGESTELL

摘要

The punch machine comprises a U-shaped member having an upper leg, a lower leg and a crosspiece to thereby form a U-shaped work space open on the front side of the punch machine but closed on the rear side by the crosspiece between the upper leg and the lower leg, a punch piston-cylinder unit with a punch tool mounted in the upper leg and a die-bearing member and/or a workpiece receiving member mounted in the lower leg. At least the upper leg experiences a bending moment and a resultant elastic deformation caused by the punching force occurring during the punching operation. To reduce the deformation, a tie bar connects both the lower and the upper legs located horizontally between the crosspiece and the punch piston-cylinder unit. This tie bar passes through or by the work space. It may be moved horizontally according to the punching force to reduce the elastic deformation. Also a process is described for operating the punch machine which keeps the bending moment constant.