What is the Difference Between Wire Drawing and Rod Drawing? In the drawing process of the wire drawing machine, the cross-section of a long rod or wire is reduced or changed by pulling (hence the term drawing) it through a die called a draw die.
Thus, the difference between drawing and extrusion is that in extrusion the material is pushed through a die, whereas in drawing it is pulled through it.
Although the presence of tensile stresses is obvious in drawing, compression also plays a significant role because the metal is squeezed down as it passes through the die opening.
For this reason, the deformation that occurs in the drawing is sometimes referred to as indirect compression.
Drawing is a term also used in sheet metalworking. The term wire and bar drawing is used to distinguish the drawing process discussed here from the sheet metal process of the same name.
Rod and wire products cover a very wide range of applications, including shafts for power transmission, machine and structural components, blanks for bolts and rivets, electrical wiring, and cables. Etc.
The major processing variables in the drawing are similar to those in extrusion that is, reduction in cross-sectional area, die angle, friction along the die-workpiece interface, and drawing speed.
The die angle influences the drawing force and the quality of the drawn product.
The basic difference between wire drawing and rod drawing is the stock size that is processed.
Rod drawing is the term used for large-diameter bar and rod stock, while wire drawing applies to small-diameter stock. Wire sizes down to 0.03 mm (0.001 in) are possible in wire drawings.
Rod drawing is generally accomplished as a single-draft operation—the stock is pulled through one die opening.
Because the beginning stock has a large diameter, it is in the form of a straight cylindrical piece rather than coiled. This limits the length of the work that can be drawn.
By contrast, wire is drawn from coils consisting of several hundred (or even several thousand) feet of wire and is passed through a series of drawing dies. The number of dies varies typically between 4 and 12.
In bar drawing, rod drawing, and in drawing of large diameter wire for upsetting and heading operations, the term draft is used to denote the before and after difference in the size of the processed work.
