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Maintenance of tungsten carbide wire drawing dies

Three forms of wear forms are listed below

1. surface roughness.
Drawing heat generated by the deformation leads to mold temperature, and partial oxidation of color appears, causing a slight abrasion. Poor lubrication hole lead wire and die surface dot welding, tungsten carbide particles loss, displacement from scratches and corrugated cones and sizing work with a rough surface,  greater wear.

2. the ellipse.
Carbide hardness uneven drawing direction does not coincide with the axis of the die orifice, the die hole single metropolitan excessive force resulting in an ellipse.

3. an annular groove.
It is typical of fatigue wear; Wire Drawing Dies holes during uninterrupted wire to withstand the impact so that tungsten carbide particles fall off, forming a rough surface, rough surface and from the surface of the wire scraping metal shavings, lubricating conditions deteriorate, wear faster,ultimately bear the impact of the largest regional annular groove formed in the die orifice.

Oxidation discoloration from a rough surface and an annular groove is constantly worn, and the increasing process appears. The rational use of the mold to extend the die life method is grinding time; the die hole appeared in the front annular groove on the mold replacement. Die promptly after each use to clean and inspect; slight wear surface polishing or grinding can be done directly after the polishing process using to mold; try to mold polishing amount to a minimum level, and then increase the number of mold repairs.

GB / T, 61 10 provides that when the die orifice diameter approaches the maximum pore size of the molded body,  more pay attention to checking the orifice surface; even a slight texture should be scrapped, causing the wire to prevent waste. Pull die life usually wear 0.01mm pulled out a few meters, or to measure how much the quality of the wire, drawing medium size (diameter 4.0mm) special steel wire, carbide wire dies life values ​​are generally able to reach 300,000 m / 0.01mm above.

 

Statistics show that the core rupture form:

  1. longitudinal, have broken the mold in a longitudinal 75%, of which 90% is normal after repeated repair damage after grinding mandrel wall thinning caused only a small part because of the drawing area reduction rate is too large, steel surface descaling without a net, coating well and mold caused by poor installation inserts;
  2. transverse, accounting for about 13% of the total transverse mounted mainly mold inserts bad, as the mandrel through the large round tapered or not, the bottom surface of the mold core and mold caused by poor contact sleeve. The drawing reduction rate is too large; poor lubrication is the secondary cause;
  3. crack and take away meat exports break Accounting for 6% respectively crack, mold material defects and improper reasons for each half of the drawing process, mainly the mold of the meat quality.
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