With the rapid development of AI servers, high-speed communications, and other advanced electronics applications, high-layer-count and high-density PCBs are becoming increasingly common. Changes in PCB materials and structural designs are placing higher demands on hole-wall quality, drilling accuracy, and process stability during continuous mechanical drilling.
Micro drills are critical consumables in mechanical PCB drilling. Their wear resistance and chip evacuation performance directly affect drilling quality and tool life. By depositing wear-resistant and low-friction functional coatings on the surface of micro drills through vacuum coating technology, tool performance can be enhanced to better meet the machining requirements of different PCB materials.
Wear and Chip Evacuation Affect Drilling Quality: The Coating Must Balance Wear Resistance and Friction Reduction
PCB materials typically consist of copper foil, resin, glass fibers, fillers, and other components. During continuous drilling, the cutting edges of micro drills are subject to abrasive wear from glass fibers and certain hard fillers, while chips may adhere to or accumulate inside the helical flutes.
As cutting-edge wear increases or chip evacuation becomes restricted, drilling resistance may increase, potentially resulting in rough hole walls, burrs around hole entrances, and other quality issues. Therefore, micro-drill coatings need to provide both high wear resistance and low friction, while remaining compatible with the tool material, geometry, and actual machining conditions.
Zhenhua MFA0605: High-Hardness, Low-Friction Coatings for PCB Micro Drills
To address the surface-engineering requirements of miniature PCB cutting tools, Zhenhua Vacuum has developed the MFA0605 hard coating system, which can deposit functional hard coatings such as Ta-C on tool surfaces. Ta-C coatings can achieve a hardness of approximately 63 GPa while exhibiting low-friction characteristics, helping to improve the wear resistance of the tool surface.
For micro-drill applications, high-hardness coatings enhance the tool surface’s resistance to abrasive wear, helping protect the drill tip and cutting edges. The low-friction characteristics can reduce friction between the micro drill, PCB material, and cutting chips, creating more favorable conditions for chip evacuation. By matching coating properties with actual drilling conditions, the coating system can help improve micro-drill performance during use.
Curved-Duct Filtration Reduces Macro-Particles While Maintaining Coating Surface Quality for Precision Tools
Micro drills feature fine cutting edges and helical flutes, making coating surface morphology particularly important to their application performance. Macro-particles generated during arc deposition may adhere to these areas and form localized protrusions, potentially affecting coating surface quality.
The Zhenhua Vacuum MFA0605 is equipped with a self-developed curved-duct filtering system that effectively filters macro-particles generated during arc deposition and reduces their impact on the coating surface. Combined with optimized film-thickness and multilayer-architecture design, the system provides a suitable solution for depositing hard coatings on precision tools such as micro drills.
Multiple Coating Systems for Different Tools and Machining Conditions
In addition to Ta-C coatings, the Zhenhua Vacuum MFA0605 can deposit a range of hard coatings, including AlTiN, AlCrN, TiCrAlN, TiAlSiN, and CrN. For different micro-drill specifications and PCB materials, the coating system can be selected according to requirements for wear resistance, friction characteristics, and coating-substrate adhesion. Tool performance can then be evaluated through actual drilling tests, including tool wear, hole quality, and effective drilling count.
The equipment has been applied in the PCB micro-tool industry and can also be extended to applications such as molds, punches, automotive components, and pistons, providing flexible surface-engineering options for different products.
The evolving requirements of advanced PCB manufacturing are driving micro drills toward coating solutions that are increasingly tailored to specific PCB materials and machining conditions. The value of coating technology lies in translating surface properties into measurable improvements in actual tool performance.
With its curved-duct particle-filtering technology and capability to deposit a variety of hard coatings, the Zhenhua Vacuum MFA0605 provides equipment support for PCB micro-drill manufacturers, helping customers develop coating solutions tailored to their specific requirements for wear resistance, friction reduction, and drilling quality.
-This article was published by vacuum coating equipment manufacturer Zhenhua Vacuum
Post time: Sep-28-2026