Tungsten Carbide Drill Bits for Machining Hard Metals: A Complete Solution for Rotation Speed, Feed

1. Performance advantages of tungsten carbide drill bits

Tungsten carbide drill bits (solid carbide drill bits) are the preferred hole-making tools for machining high-hardness, high-strength materials. Their hardness is close to that of diamond, and when machining steel with a hardness exceeding HRC35, their service life is 5–10 times that of high-speed steel drill bits.

Key advantages:

Extremely high wear resistance: remains sharp even after drilling thousands of holes continuously.

High-speed cutting capability: linear speed up to 60–150 m/min (depending on the material).

High-quality holes: hole diameter tolerance can reach H8–H10, surface roughness Ra 1.6–3.2μm.

Suitable for automated production: fewer tool changes, suitable for CNC machining centers and robotic arms.

2. Recommended rotational speed and feed rate for different materials

The following are reference parameters for a 6mm diameter tungsten carbide drill bit (coated with TiAlN):

Important note: If the drilling depth exceeds 3 times the diameter (3D), the feed rate should be reduced by 15%–20%, and it is recommended to use the "peck drilling" (G83) cycle for chip removal.

3. How to avoid fracture: Key skills for using carbide drill bits

The brittleness of tungsten carbide makes it very sensitive to impact and vibration. Here are 4 professional tips to prevent the drill bit from breaking:

1. Rigidity is king: Ensure the machine tool spindle, tool holder, and workpiece fixture have no looseness. Any micro-vibration can cause the cutting edge to chip.
2. Runout control: Use high-precision collets (such as ER grade A or hydraulic tool holders). The runout at the tip of the drill bit must be controlled within 0.02 mm.
3. Center drilling or spotting: When drilling into hard materials or on inclined surfaces, a spot drill should be used first to create a shallow hole to ensure the carbide drill bit enters along the center line.
4. Coolant strategy: Use high-pressure internal coolant if possible. If using external coolant, ensure the spray is directed exactly at the hole entrance and provide sufficient flow to ensure chip removal and temperature control.

Conclusion

Tungsten carbide drill bits are powerful tools for improving production efficiency, but their performance depends on a scientific match of speed, feed, and high-standard equipment management. If you encounter issues with abnormal wear or breakage during use, please contact WAT technical support for professional optimization solutions.