Grip ring metal wire material, method of producing such grip ring metal wire material and device for producng such grip ring metal wire material, and method of producing pipe coupling grip using metal wire material, device for producing such pipe coupling grip ring, and pipe coupling grip ring

摘要

Disclosed are metallic wire with high surface quality and low-cost suitable for use as material for grip rings and a producing method and apparatus thereof. Metallic wire 34 deformed in a coil shape is passed through a shape correction unit 14 so as to straighten it. Furthermore, while upper and lower pressing rollers 19, 20, 26, 27 prevent the metallic wire 34 from warping upwardly and downwardly, wedge-shaped grooves are continuously formed on the metallic wire 34 by means of a first cutting roller 21 and a second cutting roller 23.