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Analysis On The Wear Reasons Of PCD Wire Drawing Die
knowing the reasons how the PCD wire drawing dies wear could help extend its service life.
Jun 10th,2021
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Analysis On The Wear Reasons Of PCD Wire Drawing Die
knowing the reasons how the PCD wire drawing dies wear could help extend its service life.
1.1 The processing quality of the drawing die itself leads to die wear
(1) The asymmetrical inlay of the diamond die blank and the steel case, and the uneven distribution or gaps of the sintered cemented carbide steel sleeve can easily lead to U-shaped cracks during the wire drawing process;
(2) During the laser drilling process of the diamond die blank, the sintering traces are not cleaned up or the heating is uneven, which will cause the metal catalysts and bonding agents in the diamond layer to gather together, which will easily lead to pits in the drawing die during the wire drawing process;
(3) The wire drawing die hole design is unreasonable, the inlet lubrication area opening is too small, and the setting area is too long, which will lead to poor lubrication, resulting in drawing die wear and even chipping.
1.2 Improper use of factors in the wire drawing process leads to the drawing die wear
(1) The drawing surface shrinkage is too large, causing cracks or broken the PCD wire 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 PCD wire drawing dies part of the material is removed, and the stress on the microcrystalline structure is greatly increased, making it prone to cracks or breakage.
(2) The drawing axis of the wire rod is asymmetrical with the center line of the die hole, resulting in uneven stress on the wire rod and the wire drawing die, and the impact generated by mechanical vibration will also cause high stress peaks on the wire rod and the wire drawing die. Will accelerate the wear of the PCD wire drawing dies.
(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 PCD wire drawing dies 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 debris and impurities that cause the PCD wire drawing dies 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 very easy to scratch the surface of the PCD wire drawing dies and the wire.
Any questions on PCD wire drawing dies, please feel free to contact info@maxcarbide.com
