The invention belongs to the field of angle steel
punching machines, and discloses a large angle steel production
punching machine which comprises a lower supporting frame, a first supporting piece, a second supporting piece and a hydraulic
assembly. The first supporting piece is perpendicular to the side wall of the lower supporting frame. When the
punching machine is switched to apply pressure to the other side of the angle steel, damping liquid of the hydraulic
assembly on the original non-stress side flows back, the locking state of the self-locking piece is relieved, the abutting force of the second supporting piece is weakened, and when the angle steel is pressed to move horizontally, the triggering
assembly drives the hydraulic assembly and synchronously activates the second supporting piece on the opposite side to abut against the side wall of the angle steel to restrain outward movement. Meanwhile, the self-locking piece of the first supporting piece on the same side as the stress side rotates to form a rigid stop, the angle steel moving path is limited to be
parallel translation perpendicular to the stress direction, interlayer
dislocation caused by downward sliding of the upper-layer angle steel is effectively restrained, and sliding of the upper-layer angle steel is limited, so that when a flexible layer in the middle of the double-layer angle steel deforms, the deformation of the flexible layer is avoided; and the coaxiality of the upper-layer angle steel punching hole and the lower-layer angle steel punching hole can still be kept.