binding wire, wire drawing machine, galvanized wire, annealed wire, www.hbbuildingmaterials.comby Dogkennels D. 86-13363335099 Wire drawing is a metalworking process that reduces the diameter of a wire by pulling it through a die designed for that purpose. Shengzhou city Huoban Building Materials Co.,Ltd. produces the wire drawing machine, and the drawing wire, annealed wrie, galvanized wire.www.hbbuildingmaterials.com
Usually performed at room temperature, wire drawing is different from extrusion in that the wire is pulled through the die, rather than pushed. While the most commonly known application for drawn wire is the cabling used for electrical and communication networks, there are countless other uses as well: paper clips, springs, tire spokes, and musical wire (the wires used in violins, cellos, and other stringed instruments) are all made using drawn wire.
Archaeological evidence suggests that around 400 BC, metal workers were experimenting with wire drawing, fashioning crude dies, and drawing wire through them by hand.Until the middle of the 19th century, the process of wire drawing became more sophisticated, as craftsmen developed different techniques, including the use of the steam engine to power the actual drawing process. They learned to lubricate the wire being drawn, which decreased the amount of energy necessary to draw wire and marginally improved the quality. However, the quality of drawn wire was always limited by the quality of the metal from which it was made. Metals of inconsistent purity and malleability would routinely break when drawn into wire. Broken wire would need to be spliced, a time-consuming process that resulted in a loss of quality, which was a critical problem for such applications as telegraph communication. The poor quality of the wire drawn increased the time necessary for production and made wire very costly.
Once the wire rod has been cleaned of surface impurities, the end is tapered enough that it will fit through the die, which itself is tapered with the opening on one side wide enough to accommodate the wire rod, narrowing up to 40 percent over its length. The tip of the tapered wire rod is grasped firmly and drawn through, reducing its diameter. The narrow wire is usually coiled around a core, although it may sometimes be passed through a smaller die to continue the narrowing process. A thick wire can be reduced in diameter up to 40 percent in a single pass; thinner wire can be reduced by 15 to 25 percent.
To produce the very fine wires used in telephone cables and stranded electrical cable, wire is drawn through successively narrower dies. Once drawn, wire is sometimes subjected to additional processing, depending on its intended use. For example, a process called annealing, or heating the finished product to a certain temperature for a set period of time, is performed if the wire must be flexible and supple. Thicker wire that will be cut into nails isn't annealed, but will often be galvanized, or coated with zinc, to prevent rust. Wire used in fencing, such as barbed wire, is usually both annealed and galvanized.
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