METHOD AND DEVICE FOR PLASTIC STRETCHING OF A METAL WIRE

摘要

The present invention relates to a method for plastic stretching of metal wires and a stretching device. The stretched wires are used amongst others to produce concrete reinforcements and concrete constructions. The method comprises (a) providing a metal wire; (b) measuring the diameter of the metal wire; plastic stretching of the metal wire provided in step (a) and measured in step (b) by means of at least two rotating shafts, whereby the distance or tension between the rotating shafts can be adjusted, thus obtaining a stretched metal wire; (d) measuring the diameter of the stretched metal wire; and (e) controlling the distance or tension between the rotating shafts in step (c) based on the diameter of the metal wire measured in step (b) and the diameter of the stretched metal wire measured in step (d). The stretching device comprises at least an unrolling device for unrolling the metal wire; at least one measurement device for measuring the diameter of the metal wire; a stretching station comprising at least two rotating shafts, wherein the distance or tension between the rotating shafts is adjustable, wherein incoming metal wire is stretched to obtain a stretched metal wire; at least one measuring device for measuring the diameter of the stretched metal wire; control of the distance or tension between the at least two rotating shafts from the measurement device for the metal wire and the stretched metal wire; and a drawing plate for driving the metal wire.