Wire drawing

Wire drawing

Wire drawing is a manufacturing process used to reduce or change the diameter of a wire or rod by pulling the wire or rod through a single or series of drawing die(s). 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. Although similar in process, drawing is different than extrusion, because in drawing, the wire or rod is pulled, rather than pushed, through the die(s) (Kalpakjian).

The Wire Drawing Process

Wire or rod stock is drawn through one or more tapered wire drawing die in succession. As the wire is pulled through the die(s), its volume remains the same, so the change in diameter is inversely proportional to the change in length, i.e. as the diameter decreases, the length increases, and vice versa. Reductions of the diameter of the wire can range up to 45 percent per pass—smaller wires being reduced 15-25 percent, and larger sizes at 20-45 percent. Drawing is usually performed at room temperature, but it may be performed at elevated temperatures for large wires or rods or hollow sections in order to reduce forces (Kalpakjian).
Drawing very fine wires wire by wire is possible but costly. Rather than drawing one wire at a time, wires can be drawn in bundles through a die. In a bundle, wires are separated by a metal with similar properties as the wires being drawn, but with lower chemical resistance so that it can be removed after drawing. Wires and rods can also be drawn into different shapes by using differently shaped dies. This is a very difficult process though, and takes much experience to perform correctly.

Drawing Dies

Drawing dies are typically made of tool steels and carbides. For hot drawing, cast-steel dies are used, and for drawing fine wires, diamond dies may be used. For steel wire drawing, a tungsten carbide inner "nib" is inserted inside a steel casting. The hard carbide provides a wear resistant surface for the reduction of the steel wire. Die angles usually range from 6-15 degrees, and each die has at least 2 different angles—the entering angle and approach angle.


Lubrication in the drawing process is essential for maintaining good surface finish and long die life. The following are different methods of lubrication:
• Wet drawing: the dies and wire or rod are completely immersed in lubricant
• Dry drawing: the wire or rod passes through a container of lubricant which coats the surface of the wire or rod
• Metal coating: the wire or rod is coated with a soft metal which acts as a solid lubricant
• Ultrasonic vibration: the dies and mandrels are vibrated, which helps to reduce forces and allow larger reductions per pass (Kalpakjian)

Kalpakjian, Serope and Steven R. Schmid. Manufacturing Engineering and Technology. New Jersey: Pearson Prentice Hall, 2006: p.415-419, 5th Ed.

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Wire drawing — Wire drawing. См. Волочение проводов. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • wire drawing — Making of wire, generally from a rod or bar. The wire drawing process consists of pointing the rod, threading the pointed end through a die, and attaching the end to a drawing block. The block, made to revolve by an electric motor, pulls the… …   Universalium

  • wire-drawing — noun draw out (metal) into wire. → wire draw …   English new terms dictionary

  • wire drawing — Смотри волочение проволоки …   Энциклопедический словарь по металлургии

  • wire-drawing — …   Useful english dictionary

  • Wire — For other uses, see Wire (disambiguation). Wires overhead A wire is a single, usually cylindrical, flexible strand or rod of metal. Wires are used to bear mechanical loads and to carry electricity and telecommunications signals. Wire is commonly… …   Wikipedia

  • Drawing (manufacturing) — The basic drawing process for a wire, bar or tube. Drawing is a metalworking process which uses tensile forces to stretch metal. It is broken up into two types: sheet metal drawing and wire, bar, and tube drawing. The specific definition for… …   Wikipedia

  • wire — wirable, adj. wirelike, adj. /wuyeur/, n., adj., v., wired, wiring. n. 1. a slender, stringlike piece or filament of relatively rigid or flexible metal, usually circular in section, manufactured in a great variety of diameters and metals… …   Universalium

  • drawing — /draw ing/, n. 1. the act of a person or thing that draws. 2. a graphic representation by lines of an object or idea, as with a pencil; a delineation of form without reference to color. 3. a sketch, plan, or design, esp. one made with pen, pencil …   Universalium

  • wire-draw — verb (past wire drew; past participle wire drawn) 1》 [often as noun wire drawing] draw out (metal) into wire. 2》 [often as adjective wire drawn] archaic refine (an argument or idea) in such a way that it becomes forced. Derivatives wire drawer… …   English new terms dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.