Method and device for the burr-free separation of a wire and a correspondingly separated wire piece
AssigneeGehring e-tech GmbH
InventorsGiuseppe Zana, Fabrizio Giuradei
Life of this patent
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Abstract
The invention relates to a method for burr-free cutting-off of a wire, an apparatus for burr-free cutting-off of a wire, a wire piece and a hairpin.
Claims22
A method for burr-free cutting-off of a wire formed with a polygonal cross-section, comprising by the following steps:
- reshaping of the wire at a longitudinal wire location by moving two reshaping sections of a first reshaping unit, which are opposite one another in a first plane, towards one another along a first axis of movement, wherein the reshaping sections of the first reshaping unit are always spaced apart from one another during the reshaping of the wire, so that the wire cross-section is tapered from two opposite sides during this first reshaping step and a tapered wire cross-section remains,
- temporally subsequent to the first reshaping, reshaping of the wire at the same longitudinal wire location by moving two reshaping sections of a second reshaping unit, which are opposite one another in a second plane, towards one another along a second axis of movement, wherein the reshaping sections of the second reshaping unit are always spaced apart from one another, so that the already tapered wire cross section is tapered from two further opposite sides during this second reshaping step and the already tapered wire cross section remains in a further tapered shape;
- and
- tensile cutting-off of the wire at the same longitudinal wire location with now tapered wire cross-section by applying a tensile force to the wire.
An apparatus for burr-free cutting-off of a wire having a polygonal cross-section, characterized by a first reshaping unit for reshaping the wire with two reshaping sections which are opposite one another in a first plane and can be moved towards one another along a first axis of movement by a tool drive, wherein the reshaping unit is adapted such that the reshaping sections of the first reshaping unit are always spaced apart from one another during the reshaping of the wire, so that during the reshaping by means of the reshaping sections of the first reshaping unit the wire cross section can be tapered from two opposite sides to a tapered wire cross section;
- a second reshaping unit for reshaping the wire with two reshaping sections which are opposite one another in a second plane and can be moved towards one another along a second axis of movement by the tool drive, wherein the reshaping unit is adapted such that the reshaping sections of the second reshaping unit are always spaced apart from one another during the reshaping of the wire, so that during the reshaping by means of the reshaping sections of the second reshaping unit the already tapered wire cross section can be tapered from two further opposite sides to a further tapered shape;
- and a gripper unit which can be used to in particular clamp and to tensile cut-off the wire, wherein the apparatus is adapted such that the two reshaping units perform the movement along the respective axis of movement one after the other.
A wire piece with a polygonal cross-section which has been cut-off from a wire (12), wherein the wire piece has a tapered section which is created by plastic reshaping and is offset inwardly in a radial wire direction relative to an original outer surface of the wire and transitions into a fracture surface created by tensile cutting-off, wherein the tapered section has a pair of first radially inwardly sloping surfaces and a pair of second radially inwardly sloping surfaces, wherein the transition of the first sloping surfaces to the fracture surface is formed by a pair of first transition edges and the transition of the second sloping surfaces to the fracture surface is formed by a pair of second transition edges, wherein the first transition edges and the second transition edges are straight and are arranged orthogonally to each other, wherein the distance of the two first transition edges from each other is greater than the distance of the two second transition edges from each other.
(canceled)
Dependencies are inferred from the claim text.