Wire drawing dies overview

Internal geometry of a die

A drawing die is firstly used to draw a metallic wire to the required diameter. Whichever its use, the internal geometry of the die can always be defined by 5 areas, each one having an essential purpose for the wire drawing process: entrance cone, reduction cone, bearing, back relief and exit cone.

These 5 areas make the internal geometry of a die and will be determined by the material to be drawn and the process parameters (lubrication type, speed, elongation, etc…)

This geometry also influences greatly on the properties of the material being drawn (wire, bar tube, etc…)

Lastly, a used diamond die inspected under the microscope can give valuable information about the concerned process it came from and the possible improvements to be made (lubrication, filtration, etc…)


Essential factors for die performance

Diamond wire drawing dies must integrate performance, longevity and be competitive. Many factors can make the difference :

  • Raw material quality
  • Mounting quality (mechanical and thermal performance)
  • Internal geometry precision and consistency
  • Final polishing quality


The raw material quality is crucial, the process and technologies employed are fundamental and people know how and expertise remains decisive !


High speed drawing

Back relief

Coated wires