In the world of CNC machining, precision and durability are paramount, especially when working with ultra-hard materials like granite, ceramics, or quartz. Traditional carbide tools often struggle in these applications, suffering from rapid wear and poor edge retention.
This is where PCD (Polycrystalline Diamond) Engraving Tools excel. Engineered with a diamond layer sintered with a metal binder, these tools offer unmatched hardness and longevity. Below is a comprehensive guide to the core parameters, advantages, and applications of our PCD engraving bits.
1. Core Technical Parameters
● Material Composition: Diamond Micropowder + Metal Binder (Cobalt/Nickel).
● Tip Diameter: Available in 3mm, 4mm, and 6mm.
▫Tip: For small font lettering or fine detail, we recommend the 3-4mm range for higher precision.
● Cutting Edge Length (CEL): Typically 8-12mm.
▫Note: A length that is too short may cause chip clogging, while a length that is too long compromises tool rigidity.
● Shank Material: Tungsten Carbide or Stainless Steel (selected for high rigidity and vibration dampening).
● Interface Compatibility: Designed to match standard CNC engraving machine spindles, compatible with ER11 and ER16 collets.
● Recommended Cutting Speed: 8000 – 15000 RPM.
▫Warning: Exceeding this range generates excessive heat, which can damage the diamond layer.
● Performance Comparison: Offers 5 to 10 times the wear resistance and lifespan of traditional engraving tools.
2. Key Advantages of PCD Tools
Why switch to PCD? The benefits stem from the material's physical properties:
1. Ultra-High Hardness (HV 8000+): Capable of effortlessly machining the hardest materials, including granite, silicon carbide, and quartz.
2. Self-Sharpening Mechanism: During use, worn diamond particles micro-fracture and peel off layer by layer. This continuous process exposes new, sharp diamond edges, maintaining cutting performance.
3. High Thermal Stability: PCD remains stable up to 700°C without oxidizing, making it suitable for high-speed cutting environments.
4. Chemical Inertness: The diamond surface has a low coefficient of friction and low affinity to non-ferrous materials, preventing "sticking" or built-up edge (BUE).
3. Applications
PCD engraving tools are designed for specific "hard and brittle" material applications.
Recommended for:
1. Stone Processing: Precision lettering and engraving on Granite and Marble.
2. Composite Materials: Clean cutting of Carbon Fiber and Glass Fiber without delamination.
3. Precision Molds: Creating micro-textures on Ceramics and Hard Alloys.
4. Electronics Industry: Machining Al₂O₃ (Alumina) Ceramic Substrates and Quartz Glass.
Important Note: PCD tools are NOT recommended for soft materials like wood or plastics. Using them on these materials can lead to over-cutting ("biting") or edge chipping due to the tool's geometry.
4. How to Select the Right PCD Engraving Tool
Choosing the correct tool ensures efficiency and prevents breakage. Follow these guidelines:
● Match Material Hardness to Grain Size:
▫ Use Coarse Grain PCD for impact resistance (roughing).
▫ Use Fine Grain PCD for high precision and surface finish.
● Cutting Mode:
▫ Single-Edge: Best for fine detail and precision work.
▫ Multi-Edge: Better for high-efficiency material removal.
● Shank Rigidity: Ensure the shank (Tungsten Carbide or Stainless Steel) provides sufficient rigidity to prevent vibration during the cut.
● RPM Control: Strictly adhere to the 8000 – 15000 RPM range to protect the PCD layer from thermal damage.
Looking for durable, high-precision engraving solutions?
Our PCD engraving tools are manufactured to the highest standards to reduce your tooling costs and improve machining quality. Contact us today for a quote or technical consultation.
