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Tungsten carbide drawing dies,Tungsten carbide wire drawing dies
Production of Tungsten Carbide Drawing Dies in Four Steps
1. Tungsten caride mould processing
The core of the hard alloy drawing die will shrink during the sintering process. This is due to differences in composition, pressing, and sintering processes. The shape of the "saddle", or "bell mouth", is often affected by the shrinkage of die parts. While the die's shape is consistent with the standard, the fluctuation in die size is often more than the interference requirements of the set. This results in the die's service life being significantly reduced and prestress bearing problems for the core. The outer circle must be ground in order to ensure that the die is not damaged. This requires special fixtures on the grinder and a diamond grinding wheel.
2. Interference of cemented caride mould steel set
In order to achieve a certain prestress during insert, the diameter of the inner hole in the mold sleeve must be smaller than that of the core. The factors that cause interference should be taken into account are die core size, deviation, drawing stress, and insert method. The actual interference during mold mounting is shown in Table 1. The die set is inlaid using either hot pressing or cold pressing methods. Cold pressing method interference is very small and the pre-compression stress also is small. This is used to make small specifications and soft metal drawing tools.
3.Tungsten carbidemold sleeve processing
Turning on a lathe forms the mold sleeves. These are the control points:
The mold sleeve's inner diameter must be 0.80 inches. 6m is a good length for a tight fit with the mold sleeves.
To ensure that each mold is intertwined accurately, the inner diameter of the mold sleeves should match the outer diameter of each blank.
You must ensure that the bottom of the mold sleeve's inner hole and the outer end are parallel. Also, make sure the center line of your mold hole is vertical once the sleeves have been installed.
The inner hole of the mold sleeves should have a minimum ellipticity of 0.02mm. Hot loading should illuminate the mold cover's outer surface. After mounting, uniform cooling should be achieved.
4. Cemented Caride Mold Mounting Technology
Cold pressing is when the blank is pressed into the mold sleeves at room temperature. Cold pressing requires precise interference and high dimensional accuracy in mold core and mold sleeves. This method is cost-effective and energy efficient, as it does not require heating.
Before grinding or polishing, tungsten carbide wire drawing dies can be securely attached to their die housings. The quality of the drawing box is a key factor in the service life of wire drawing dies. When drawing large diameters or hard materials, the quality of the case is crucial. The die blank should be securely fixed in the case at the drawing temperature to ensure the carbide's service life.