Patent ID: 9630226
Date: 2017-04-25
CPC Classifications: B21B,B23D,B23P,B26F,C04B,E04C,Y10T

Claim:
1. A method of making steel fibers for use as a concrete additive, and for the supply thereof in making steel fiber concrete, the method comprising the steps of: to form the steel fibers, first notching a sheet-metal strip on one face or both faces so as to form steel-fiber wires that are initially connected together by webs, and thereafter, for converting the webs into thin easily mutually separable separation webs forming separation surfaces that are fracture-rough and low in burring upon separation, flexing the steel-fiber strip by subjecting each web to multiple bending deformations about its longitudinal axis, wherein the strip is alternated between an inclined position and a declined position with respect to the lateral width of the strip as the strip is subjected to the multiple bending deformations and in such a way that incipient cracks are produced at the webs due to fatigue fracture and thus the separation webs are produced.