In addition to the poor sedimentation of the drawing oil, there are other reasons why the drawing die is easily damaged!
April 14, 2022
Poor lubrication and poor settling of drawing oil or lubricating oil containing metal debris impurities lead to mold 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 die damage. 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 mold and wire. In addition to the poor sedimentation of the drawing oil, what else will affect the life of the drawing die?
(1) The drawing area shrinkage rate is too large, resulting in cracks or breakage of the mold. Most of the cracks or fractures are caused by the release of internal stress. In any material structure, the existence of internal stress is inevitable. The internal stress generated when the wire is drawn can enhance the diamond microcrystalline structure, but when the drawing area shrinkage is too large, it cannot be lubricated in time and the temperature rise is too high, which will lead to diamond. The mold shows that some of the material has been removed, and the stress on the microcrystalline structure is greatly increased, making it more prone to cracking or breakage. (2) Factors such as uneven hardness of the wire caused by uneven annealing are likely to cause premature fatigue damage to the diamond wire drawing die, forming an annular groove and aggravating the wear of the die hole. (3) The surface of the wire is rough, and the surface adheres to the oxide layer, sand or other impurities, which will cause the mold to wear out too quickly. When the wire passes through the die hole, the hard, brittle oxide layer and other adhering impurities will cause the wire drawing die die hole to wear quickly and scratch the wire surface like abrasives. (4) The tensile 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 a high stress peak to the wire rod and the wire drawing die. All will accelerate the wear of the mold.
