What is the wire drawing?
Wire drawing is a process of metal processing that reduces the wire diameter by stretching it for this purpose. Usually carried out at a room temperature, the drawing of the wire differs from the push -up in that the wire is stretched by the deceased rather than push. While the most commonly known application for the drawn wire is cabling used for electric and communication networks, there are also countless other uses: paper clips, springs, tires and music wires (wires used in mushrooms, cello and other chain tools) are made using a very thin wire. These thin slices would be hammered again until they were fine enough to be used for jewelry or to be woven into clothing. Archaeological evidence suggests that about 400 BC, metal workers experimented with wire drawing, fashionable raw to die, and draw them manually.
until the middle of the 19th century the process of drawing of the wire becameMore sophisticated because craftsmen developed various techniques, including the use of a steam engine to power the actual drawing process. They learned to lubricate the drawn wire, which reduced the amount of energy needed to draw the wire and slightly improved quality. However, the quality of the drawn wire has always been limited by the quality of the metal from which it was made. Metals of inconsistent cleanliness and tradability would break routinely when drawing into the wire. A broken wire would have to be connected, a time -consuming process that led to a quality loss, which was a critical problem for applications such as telegraph communication. The poor quality of the drawn wire increased the time necessary for production and made a very expensive wire.
It was not almost the Testade of Bessmer's process at the end of the 50th century, which produced permanently feasible metal, this wire drawing was able to produce a wire of permanently high quality. The metal poured from converters into molds called Sochory only slightly chill and then begins the process of its formWire in a hot cylindrical mill, thus using residual heat from the Bessemer process. In this process, large coils of thick wire are made, called a wire rod, weighing from 150 to £ 300 (68 to 136 kilograms).
As soon as the wire rod is cleaned from the dirt, the end is narrowed enough to fit through the matrix, which narrows itself with the hole on one side sufficiently wide to place the wire bar and reduce to 40 percent of its length. The tip of the bevelled wire rod is firmly grasped and stretched, which reduces its diameter. The narrow conductor usually curled around the core, although sometimes it can be brought through a smaller matrix to continue the narrowing. A strong wire can be reduced up to 40 percent in one passage; Thinner wire can be reduced by 15 to 25 percent.
For the production of very fine wires used in telephone cables and on the stuck electric cable, the wire is gradually drawn by narrower deaths. After drawing, the wire is sometimes exposed to further processing, depending onSti on its intended use. For example, a process called annealing or heating the finished product to a certain temperature for a specified time is performed if the conductor must be flexible and flexible. A stronger wire that will be cut on the nails is not brindle, but will often be galvanized or coated with zinc to prevent rust. The wire used in fencing, such as barbed wire, is usually brinded and galvanized.