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Wire drawing is a metalworking process used to reduce the cross-section of a wire by pulling the wire through one or more dies. There are many applications for wire drawing, including electrical wiring, cables, tension-loaded structural components, springs, paper clips, spokes for wheels, and stringed musical instruments.
Drawing is classified into two types: sheet metal drawing and wire, bar, and tube drawing. Sheet metal drawing is defined as a plastic deformation over a curved axis. For wire, bar, and tube drawing, the starting stock is drawn through a die to reduce its diameter and increase its length.
The firm grew rapidly through the 1840s expanding its range to include flour machines and other agricultural products and by 1848 there were 80 employees. What propelled the firm to a different level was the development of the electric telegraph, which required huge quantities of wire. In 1850 the first undersea cable laid across Channel and ...
Rods and bars were either sold, or rods were used to make wires up to 0.0056 inches thin. The wire train started with nine 8 and 10-die tandem drawing machines, followed if desired by one 13-die machine, followed if desired by one of twenty up-to-16-dies machines for the finest wire. Intermediate anneals as necessary.
This must be done because drawing wire hardens it, which causes the wire to become brittle. Brittle wire that has not been annealed may snap during the drawing process (or develop microscopic or macroscopic cracks, which may weaken the piece or "grow" with further working). With a mandrel, a draw plate can be used to draw tubes of metal. Plates ...
Another design is a silver-tipped metal stylus with points on both ends. An example of this type is shown in Rogier van der Weyden's St. Luke Drawing the Virgin, ca. 1435–40 (Boston Museum of Fine Arts). For a contemporary stylus, jeweler's wire may be inserted into a pin vise or mechanical pencil. [1]
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After being directly fed into a hot rolling mill, the as-cast bar is typically rolled into 8 mm diameter rod to be used for wire drawing. Copper anode casting: Special dam blocks which contain anode lug molds and a traveling hydraulic shear are added to the twin-belt casting machine to continuously cast net shape copper anodes. Anode width of ...
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