Method and device for burr-free cutting of a wire and a correspondingly separated piece of wire and hairpin

摘要

The invention relates to a method for burr-free cutting of a wire (12), in particular of polygonal cross-section, characterized by the following steps: - forming the wire (12) at a wire longitudinal position (62) by moving two of them together in a first plane ( 56) opposite Umformabschnitten (40) of a first forming unit (14) along a first axis of movement (Z), wherein during forming of the wire (12) the forming sections (40) of the first forming unit (14) are always spaced apart, so that the wire cross-section at this first forming step is tapered from two opposite sides (44) and a tapered wire cross-section remains, - forming the wire (12) at the same wire longitudinal position (62) by moving two forming sections (46) opposite each other in a second plane (56) a second forming unit (16) along a second axis of movement (Y), the U mformabschnitte (46) of the second forming unit (16) are always spaced apart, so that the already tapered wire cross-section is tapered in this second forming step of two other opposite sides (50) ago and the already tapered wire cross section remains in a further tapered shape; and - tensile severing of the wire (12) at the same wire longitudinal position (62) with now tapered wire cross section by applying a tensile force to the wire (12).