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Release time :2025-12-18
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Diamond-coated end mills are widely used for graphite machining because they offer excellent wear resistance, heat resistance, and long tool life under abrasive cutting conditions. This article explains why CVD diamond-coated end mills are more suitable for graphite electrodes, graphite molds, and other precision graphite applications than standard carbide tools.
Graphite is widely used in EDM electrode manufacturing, mold making, aerospace, and precision components.
Although graphite is easy to cut, it is highly abrasive. This often leads to fast tool wear, unstable machining, and frequent tool changes when using standard cutting tools.
For stable performance and long tool life, diamond-coated end mills designed specifically for graphite machining are the most reliable solution.
Although graphite is easy to cut, it creates several major challenges during machining:
l Abrasive graphite particles cause rapid cutting-edge wear
l Fine graphite dust easily blocks flutes and increases cutting temperature
l Edge chipping reduces surface quality and dimensional accuracy
l Frequent tool changes lower machining efficiency and consistency
These issues make standard carbide cutting tools or conventional coatings unsuitable for high speed and batch graphite machining.
Diamond-coated end mills use CVD (Chemical Vapor Deposition) diamond coatings, which provide extreme hardness and excellent wear resistance.
Key coating properties include:
l Hardness up to 8000–10000 HV
l Heat resistance up to 1000°C
l Thermal conductivity up to 2000 W/m·K
l Strong resistance to abrasion and acid corrosion
Compared with conventional PVD coatings, diamond coatings offer 5-10 times higher wear resistance, making them ideal for graphite machining.
The DOHRE CNC MEX Series diamond-coated end mills are specially designed for graphite machining.
They combine the right carbide substrate, a high-quality CVD diamond coating, and optimized geometry to handle abrasive graphite dust and high-speed cutting conditions.
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Dohre MEX Series features a CVD diamond coating with:
l Heat resistance up to 1000°C
l Thermal conductivity of 2000 W/m·K
l Excellent thermal stability and fast heat dissipation
Compared with conventional coatings, tool life can be extended by 5-10 times in graphite machining.
MEX Series Graphite end mills are made from MG-grade ultra-fine grain carbide with:
l Grain size: 1.0 μm
l Cobalt content: 6%
This material provides excellent wear resistance while maintaining sufficient edge strength for stable and reliable machining.
To reduce cutting force and improve surface quality, Dohre MEX Series end mills use:
l 35°helix angle for smooth cutting
l 6°positive rake angle to lower edge stress
l Finely polished cutting edges to prevent chipping
Radial runout is controlled within ≤0.003 mm, and dimensional tolerance is kept within±0.005 mm, ensuring high machining accuracy.
Graphite machining produces fine dust that can easily block flutes and affect accuracy.
Dohre MEX Series end mills provide this solutions:
l Optimized flute and chip pocket design
l Internal cooling structure to reduce cutting temperature and improve dust evacuation
This helps extend tool life and maintain stable machining performance.
Dohre MEX Series end mills provide this solutions:
l WALTER HELICHECK PLUS tool inspection system
l Profile and corner radius accuracy within 5 μm
l 100% visual inspection under 50×magnification
All tools are checked to ensure no edge chipping, serration, or surface defects.
MEX Series diamond-coated end mills are suitable for machining:
l Stable dimensions
l Consistent cutting edges
l Reliable performance in batch production
MEX Series diamond-coated end mills are suitable for machining:
l Graphite electrodes and graphite molds
l Titanium fiber molds and profiles
l Dental components
l Ceramics
l Engineering plastics
l Aluminum oxide (Al₂O₃) composites
l Zirconia (ZrO₂)
l Optical glass
In practical applications:
l Tool life can be 10–50 times longer than standard end mills
l Tool life is 3–10 times longer than uncoated carbide tools
This makes the MEX Series especially suitable for large-volume production of graphite electrodes and graphite molds.
For graphite machining, diamond-coated end mills are the most reliable choice. The DOHRE CNC MEX Series provides long tool life, stable accuracy, and consistent performance under demanding machining conditions.
If you are machining graphite electrodes or graphite molds in batch production, Dohre MEX Series diamond-coated end mills offer a proven and cost-effective solution.
• Graphite ball nose end mill for 3D contour finishing and profile machining • Suitable for graphite electrodes, graphite molds, graphite plates, and abrasive non-metal materials • Diamond coating supports high wear resistance in dry graphite machining • Ball nose geometry for curved surfaces, cavities, mold profiles, and smooth transitions • Ultra-fine carbide substrate with MG 1.0 μm grain size and 6% cobalt content • 35° helix angle and +6° rake angle support smooth cutting and graphite dust evacuation
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• Graphite corner radius end mill for finishing, semi-finishing, and profile machining • Diamond coating supports high wear resistance in dry graphite machining • Corner radius geometry helps improve edge strength and reduce corner chipping • Suitable for side-wall finishing, shoulder machining, profile finishing, and corner transition areas • Ultra-fine carbide substrate with MG 1.0 μm grain size and 6% cobalt content • 35° helix angle and +6° rake angle support smooth cutting and graphite dust evacuation
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• Graphite square end mill for finishing, slotting, and planar machining • Suitable for graphite electrodes, graphite molds, graphite plates, and abrasive non-metal materials • Diamond coating supports high wear resistance in dry graphite machining • Square end geometry for flat surface, bottom surface, side-wall, and slot machining • Available in 2-flute and 4-flute options according to machining requirements
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