Automatic blank plate unstacking device and method

The invention discloses an automatic blank plate unstacking device and method, and belongs to the technical field of stamping. Comprising an upper die base and a lower die base which are oppositely arranged, the lower die base is fixed to a machine table, a supporting base is fixedly arranged at one end of the lower die base, a driving mechanism is fixedly arranged at the other end of the lower die base, the driving mechanism is in threaded connection with one end of a sliding block, and the other end of the sliding block is slidably connected into a sliding groove formed in the supporting base. The sliding block reciprocates in the sliding groove under the action of the driving mechanism. Two through limiting holes are formed over the sliding groove, steel balls are placed in the limiting holes, the bottoms of the steel balls make contact with the upper surface of the sliding block, and pits matched with the steel balls are formed in the upper surface of the sliding block. The upper die base is fixedly arran