The invention relates to a plane edge-pressing and semi-fine blanking device and a method. The device is provided with a plane pressure plate and a concave die, when a workpiece is punched, the plane pressure plate needs to enable edge-pressing force to press on the outer edge of a profile of the workpiece on a workpiece blank, and the edge-pressing force can generate great
friction force betweenthe surface of the workpiece blank and the plane pressure plate and between the surface of the workpiece blank and the concave die, so as to prevent the material of the workpiece blank from flowing out of the profile of the workpiece. The device is matched with
punching force, three-dimensional
pressure stress is generated in the material of the workpiece blank in an
extrusion zone, and plastic flow is generated, so as to enable the numerical values of the
pressure stress in the three-dimensional directions to tend to be consistent, enable the material of the workpiece blank in the profile ofthe workpiece to be in the
hydrostatic pressure state and have a maximal plastic deformation range, reduce a region for generating tensile stress in a
shearing deformation zone and prevent the emergence of cracks on the surface of a cross section of the workpiece. By using the plane edge-pressing and semi-fine blanking device and the method, an ordinary punch can be used, the
processing of a die is simple, a pressurization region on the workpiece blank can not cause damages, the
processing cost is low, the quality of the workpiece is high, and the device and the method are convenient to popularize and apply in the
punching industry.