We use three processes to create wire with strength and diameter tailored to customer needs.
Annealing (heat treatment)
Annealing is a heat treatment process that alters the properties of the material (to a spherical carbide structure) to make it suitable for cold heading. When customers process the material into screws, nuts, bolts, and so on, it is easier to handle and less likely to break. Various types of heat treatment facilities are installed at each of our plants, including continuous furnaces and hydrogen furnaces.
Pickling (surface treatment)
After automatically immersing wire in tanks containing chemicals to dissolve and remove scale (oxides on the surface) and rust with hydrochloric acid (pickling), we apply surface film treatments based on the customer needs, such as zinc phosphate coating and lube.
Rolled wire rods have considerable dimensional tolerance and therefore have poor workability, so a wire drawing process is used to improve dimensional accuracy. Wire is pulled through a die with a wide opening that becomes narrower. Fed through a wire drawing machine, the wire is then made to the desired diameter. Each of our plants has wire drawing machines that support various wire diameters, from 0.6 mm to 50.0 mm.
We use a variety of facilities that can handle special processing in order to meet customer needs.
Wire drawing machine with ECPS (Eddy Current Partial Shaving)