Method and device for producing precision blankings from a material strip

A method for producing precision blankings in a precision blanking die, wherein a material strip is clamped between two die halves comprising an upper and a lower die plate as well as an upper and a lower blanking punch, and the cutting operation in interaction with the upper and the lower blanking punch is performed as an incomplete compound die cut, wherein the precision blankings are removed from the die interior of the die in the running direction of the material strip, the method comprising:

• making an incomplete compound die cut in the material strip to define a cut periphery of the precision blanking wherein the material strip is completely cut through along one or more first partial lengths of the cut periphery and partially cut through without being completely cut through along one or more second partial lengths of the cut periphery so that the precision blanking remains connected to the material strip only at one or more connecting parts defined respectively by said one or more second partial lengths of the cut periphery at one of either an upper or lower surface of the material strip, wherein said incomplete compound die cut along the cut periphery of the precision blanking is performed with a specially shaped cutting edge among edges of said upper and lower blanking punch and said upper and lower die plate;
• moving the precision blanking together with the material strip in the running direction of the strip to a subsequent removal stage;
• separating the precision blanking and the material strip from each other perpendicular to the running direction of the material strip by breaking said one or more connecting parts without using a vertical shear force component by pressing only one of an upper and lower surface of the precision blanking;
• and
• discharging the removed precision blanking through a discharge chute in the die plate.