What improper factors lead to drawing die wear during drawing process?

       

What we are going to talk about today is to observe the causes of drawing die wear through the wire drawing process, so as to avoid greater losses.

 

(1) The drawing surface shrinkage is too large, resulting in cracks or broken drawing dies. Most of the cracks or broken cracks are caused by the release of internal stress. In any material structure, the existence of internal stress is inevitable. The internal stress generated during wire drawing can enhance the diamond microcrystalline structure, but when the drawing surface shrinkage is too large, it cannot be lubricated in time and the temperature rise is too high, which will lead to diamond The drawing die indicates that part of the material is removed, and the stress on the microcrystalline structure is greatly increased, making it more prone to cracks or breakage.

 

(2) The drawing axis of the wire is asymmetrical with the middle line of the die hole, resulting in uneven stress on the wire and drawing die, and the impact generated by mechanical vibration will also cause high stress peaks on the wire and drawing die, both Will accelerate the wear of the drawing die.

 

(3) Factors such as uneven wire hardness caused by uneven annealing are likely to cause premature fatigue damage to the diamond wire drawing die, forming annular grooves, and aggravating die hole wear.

 

(4) The surface of the wire is rough, and the surface adhesion of oxide layer, sand or other impurities will cause the drawing die to wear out too quickly. When the wire passes through the die hole, the hard and brittle oxide layer and other adhering impurities will cause the wire drawing die hole to wear quickly and scratch the wire surface like abrasives.

 

(5) Poor lubrication or the lubricating oil contains metal chips and impurities that cause drawing die wear. Poor lubrication will cause the surface temperature of the diamond die hole to rise too fast during wire drawing, and the diamond grains will fall off, resulting in damage to the die. When the lubricating oil is not clean, especially when it contains metal chips that fall off during drawing, it is easy to scratch the surface of the drawing die and the wire.