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As a domestic specialized, sophisticated, and innovative manufacturer of precision PCB cutting tools, Vietnam Yongxin Precision Tool Co., Ltd. primarily produces standard tungsten carbide PCB end mills. However, with the continuous surge in orders for high-end 5G communication boards, high-Tg thick boards, and aluminum-based boards, the shortcomings of conventional uncoated tungsten carbide end mills—rapid wear and short service life—have become increasingly pronounced. A single tool’s continuous machining time falls short of two hours, resulting in frequent tool changes, high production line downtime rates, and persistently high tool consumption costs. Moreover, machined boards exhibit excessive edge burrs and significant dimensional inaccuracies, failing to meet the stringent shipment standards required for high-end substrates—making an upgrade to advanced tool coating solutions imperative.
Following in-depth technical alignment between both parties, a tailored solution was developed for Yongxin Precision’s mainstream PCB end mills with shank diameters of 1.0 mm, 1.5 mm, and 2.0 mm, utilizing microwave plasma-assisted chemical vapor deposition (CVD) diamond coating technology. Ultrafine-grained cemented carbide substrates were selected and paired with a proprietary titanium-chromium interlayer to significantly enhance coating adhesion and prevent coating delamination during high-speed machining. Precise control over coating thickness and grain density ensures an optimal balance between cutting edge sharpness and wear resistance. Throughout the entire process—from sample testing and small-batch trial production to full-scale mass manufacturing—the solution fully aligns with Yongxin’s tool production capacity and quality inspection standards. Comprehensive post-coating quality assurance and process optimization support are also provided.
After the customized CVD diamond-coated end mills entered formal production, tool service life increased by over 25-fold, with stable continuous machining time exceeding 24 hours per tool. Tool change frequency decreased substantially, boosting overall production efficiency by 65%; the yield rate for high-end substrate processing improved from 88% to 99.5%. Overall tool usage costs declined by 52%, enabling Yongxin Precision to secure long-term, large-volume orders from multiple leading PCB manufacturers. The company has successfully penetrated the high-end PCB cutting tool supply chain, simultaneously enhancing its product competitiveness and market share.
