Manufacturing Method and Use of MS Drawn Wire Coil

The Cold Drawing Process for Steel Bars and Wire

Raw Stock

Coils of hot-rolled steel bars or rods are utilized as the basic component. The hot-rolled goods often have a rough and scaled surface and may also show variations in section and size because they are made at high temperatures.

Cleaning & Coating

• On the surface of the hot-rolled rough stock, abrasive scale (iron oxide) is eliminated.
• To facilitate cold drawing, a drawing lubricant is applied to the surface of the bar or coil.

Pointing

Swaging or extrusion is used to reduce the size of the lead ends of the bar or coil by several inches so that it may freely pass through the drawing die. Because the die opening is always less than the initial bar or coil section size, this is done.

Drawing

The material being pulled in this procedure is at room temperature (i.e. Cold-Drawn). The drawing machine’s gripping device receives the bar or coil’s pointed or reduced end, which is smaller than the die opening and passes through the die. The remaining portion of the bar or coil that has not been reduced is pulled or drawn through the die by the drawing machine. The die increases the length of the original product while decreasing the cross-section of the original bar or coil and shaping its profile.

Finished Product

The drawn product, also known as cold drawn or cold finished, has a bright or polished finish, better machining qualities, increased mechanical properties, and consistent, accurate dimensional tolerances.

Annealing

This heating process is typically used to remove internal tensions from the finished product, soften the material being drawn, and/or change the steel’s microstructure, mechanical properties, and machining characteristics. Annealing can be applied before, during, or after cold drawing depending on the final product’s desired features and the amount of material needed.