Automatic material returning and punching device capable of replacing punching cutter

The utility model discloses an automatic material-returning punching device capable of replacing a punching cutter, a corresponding material-returning head with a spring is arranged in an inner cavity of the punching cutter, and meanwhile, by setting the shape and the size of the material-returning head, when a test piece in the inner cavity of the punching cutter and the punching cutter rebound, the material-returning head extrudes a punching sheet under the rebound action of the spring, so that the punching cutter can be replaced. The punching sheet and the punching sheet cutter are separated conveniently and rapidly, and the punching sheet cutter does not need to be disassembled. Punching cutters and material returning heads of different shapes can be replaced according to requirements, and the punching machine is convenient to operate, high in efficiency, good in safety, simple in structure and low in cost. 本实用新型公开了一种可更换冲片刀具的自动退料冲片装置，在冲片刀具内腔中设置了带有弹簧的对应退料头，同时通过对退料头形状和尺寸的设定，在冲片刀具内腔的试片与冲片刀具回弹时，退料头在弹簧的回弹作用下将冲