The processing quality factors of the drawing die itself lead to rapid wear of the die:
1. The drawing die blank and the die steel sleeve are not symmetrically inlaid, and the inlaid cemented carbide steel sleeve is unevenly distributed and there are gaps, which simply cause U-shaped cracks in the die wire drawing process.
2. In the laser drilling process of the diamond die blank, the sintering traces are not cleaned or the force is uneven, which will cause the diamond mold to show pits during the drawing process.
3. Unreasonable mold pass planning, too small openings in the smooth area of the inlet, and too long sizing belts will cause poor smoothness during the drawing process, resulting in accelerated mold wear and even chipping.
Improper use of elements in the drawing process leads to rapid wear and tear of the mold:
Drawing die
1. The compression rate of the drawing process surface is too large, causing cracks or breakage of the mold. 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 that occurs when the wire is drawn can enhance the microcrystalline structure of the mold, but when the compression rate of the drawing surface is too large, it cannot be smooth in time and the temperature rise is too high. Part of the material on the surface of the mold is removed, and the stress on the microcrystalline structure is greatly increased, making it easier to crack or break.
2. The drawing axis of the wire is asymmetrical with the center line of the die hole, resulting in uneven stress on the wire and drawing die, and the impact of mechanical vibration will also form a high stress peak on the wire and drawing die, both Will accelerate the wear of the mold.
3. Factors such as uneven hardness of the wire caused by uneven annealing are simply forming the diamond wire drawing die and the fatigue loss occurs prematurely, and the occurrence of ring grooves accelerates the wear of the die hole.
4. The surface of the wire is rough, and the surface adhesion of oxide layer, sand or other impurities will cause the mold to wear out too quickly. When the wire passes through the die hole, the hard and brittle oxide layer and other adhering impurities will form the die hole of the drawing die like abrasives, which quickly wears and scratches the appearance of the wire.
5. Unsmooth smoothing or metal chips and impurities in the smoothing fluid cause mold wear. Poor smoothness will cause the surface temperature of the die hole to rise too fast when drawing, and the die grains will fall off, which will cause damage to the die. When the lubricating fluid is not clean, it especially contains metal chips that fall off during drawing, which can easily scratch the surface of the die hole and the surface of the wire.
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