Preface
In the field of high-end jewelry manufacturing, texture precision, surface luster, wearing texture and mass-production consistency serve as core factors determining product value and brand competitiveness. Traditional hand guilloche and conventional mechanical machining suffer from prominent drawbacks including low productivity, inconsistent patterns, vulnerability to precious metal damage and poor machinability of complex curved surfaces, failing to meet the requirements of large-scale and premium-quality production for modern high-end jewelry.
By deeply integrating 5-axis CNC linkage control technology with precision ultrasonic auxiliary technology, we have independently developed dedicated 5-axis CNC guilloche equipment and matching processing methodologies for the jewelry sector. This innovation enables high-precision, high-efficiency, high-gloss and high-stability ornamental machining on precious metals and thoroughly renovates conventional jewelry guilloche craftsmanship.
Ⅰ. Core Benefits Brought by Ultrasonic Technology (Key Concerns for Customers)
- Functional Effects of Ultrasonic Technology
(I) Core Optical Iridescent Effects
① Angle-dependent Dynamic Rainbow Finish
The workpiece presents the original metallic tone of gold or silver at a frontal viewing angle. Full-spectrum laser hues covering red, orange, yellow, green, blue and purple will emerge sequentially when rotating the workpiece or adjusting the lighting angle. The color rendering performance differs distinctly under natural light, indoor lighting and sunlight. Continuous shaking produces flowing colorful light spots, delivering a visual effect comparable to diamond fire dispersion and holographic laser coating.
② Controllable Zonal Color Variation
By adjusting the grating pitch and texture orientation, diversified color effects can be realized on a single workpiece, including partial rainbow iridescence, partial solid monochrome (blue/purple/gold), gradient color transition and starburst radial glow. Dense textures produce delicate fine color streaks, while sparse textures form large-area holographic iridescent effects.
③ Composite Finish of High-gloss Mirror Base and Color Texture Overlay
The gaps between textures maintain a high-gloss mirror effect, while the grating areas present vivid colorful flashes. The finish features distinct layers of bright mirror surface and holographic iridescence, combining premium metallic mirror texture and rainbow luster, which delivers a more sophisticated gloss than traditional pattern cutting and diamond cutting craftsmanship.
(II) Texture & Surface Appearance
① Diverse Pattern Options Available patterns include radial starburst, straight grain, grid, honeycomb, curved ripple and custom carved motifs. With 5-axis CNC control, full-surface iridescent finishing can be processed on curved surfaces, hollowed-out structures and three-dimensional carvings for rings, pendants, bangles and hardware frames.
② Smooth Burr-free Nano-scale Texture High-frequency ultrasonic forming yields smooth and refined groove profiles. The finished grain appears compact and sleek visually and feels even and scratch-free to touch, distinct from coarse tool marks generated by conventional guilloche cutting.
③ Mixed Matte & Gloss Finishes Single components can be divided into segmented finishes of sandblasted matte, ultrasonic iridescence and mirror polishing. The sharp contrast among three textures delivers outstanding three-dimensional layering.
2.Production Efficiency Improvement on Finished Products
①Process Efficiency Total working procedures are reduced from seven to two, cutting overall production cycle by over 60%. Traditional plating or coated iridescence requires 7~9 working steps, while ultrasonic iridescent finishing only needs two steps.
② Yield & Rework Efficiency Scrap rate is greatly reduced alongside shortened reworking hours. Common defects of electroplating and coating include blistering, uneven color, peeling film and incomplete edge plating, bringing an 8%~18% defect rate. Rework requires stripping old coating and replating, consuming more time than original processing. For ultrasonic treatment, color comes from substrate surface gratings without peeling risks. Its appearance defect rate is controlled below 1.5%. Defective areas only need partial recutting instead of full re-production, saving over 90% of rework time and eliminating production downtime caused by rework.
③ Reduced Comprehensive Production Cost for Higher Profit Margin – No chemical consumables: Eliminate recurring costs of plating solution, coating targets, paint and cleaning agents, cutting per-piece material cost by 35%~60%. – Lower power consumption: Processed at ambient temperature versus high-temperature vacuum coating furnaces, saving over 40% electricity per product. – Optimized capital turnover: Shorter lead time lowers finished goods inventory and improves capital circulation efficiency.
3.Durability of Gloss & Iridescent Finish
① Ultrasonic guilloche densifies the workpiece surface structure and enhances its oxidation resistance.
② With routine wearing and proper maintenance, the high-gloss appearance can be sustained steadily for 18 to 24 months.
③ The surface regains brightness via simple cleaning; it resists tarnish and black oxidation after long-term wear.
④ Its superior gloss retention outperforms conventional processing greatly and optimizes end-user experience.
- Market Application and Customer Recognition
Ultrasonic precision guilloche has evolved into a standard mainstream technology within the high-end jewelry sector.
① Top-tier jewelry brands including Chow Tai Fook, Chow Sang Sang, Lukfook and Laofengxiang have adopted this technique for mass production.
② Over 90% of cross-border e-commerce merchants and light-luxury designer brands apply this high-gloss guilloche process.
③ End consumers consistently comment that finished products feature brighter luster, finer craftsmanship and superior premium texture, remaining nearly new after prolonged wear.
④ Market statistics prove jewelry with this technology enjoys higher repurchase rates, lower negative review ratios and stronger premium pricing capacity.
- Core Equipment Composition
The machine is tailor-made for continuous production of precious metal jewelry with stable structure, precise control and reliable operation:
①Rigid integrated machine base
② 5-axis linkage precision motion system
③ High-frequency ultrasonic auxiliary execution module
④ High-speed & high-stability precision spindle
⑤ Dedicated intelligent control system
III. Working Principle
Mechanical Forming: The ultrasonic unit generates high-frequency micro-vibration of 28~40kHz. A diamond cutter mills periodic micron-scale fine grooves (diffraction gratings) directly into the base metal substrate.
Optical Color Rendering: Incident light diffracts and splits when entering the grooves, creating iridescent color shifts as the workpiece rotates. Color effects are adjustable by modifying the pitch and depth of grooves. No plating or paint coating is involved; iridescence disappears only when surface gratings are worn flat.
- Standardized Processing Flow
① Incoming Preprocessing: CNC shaping → degreasing & cleaning → defect sorting.
② Fixturing & Programming: Secure workpieces and load preset grating machining programs.
③ First Article Trial Run: Trial cutting for color verification and finalization of mass-production parameters.
④ Mass Ultrasonic Machining: Synchronized CNC feeding and ultrasonic engraving to form iridescent patterns in one pass.
⑤ Simple Cleaning: Rinse off fine dust with clean water; polishing is forbidden to avoid grating abrasion.
⑥ Full Final Inspection: Check for incomplete engraving and color deviation; repair defective spots via partial recutting.
⑦ Optional Protection: Apply ultra-thin nano anti-fingerprint coating to extend gloss service life.
- Technical Advantages and Industry Value
① Omni-directional blind-spot-free machining enables effortless processing of complex curved surfaces, deep cavities and inner walls of workpieces.
② It delivers long-lasting high-gloss texture with excellent oxidation resistance and wear resistance, effectively enhancing product premium value.
③ It supports efficient and intelligent mass production with higher productivity, lower costs and consistent quality, eliminating reliance on manual operation.
④ This technology creates distinctive brand differentiation, and significantly strengthens market competitiveness and consumer recognition.
- Core Intellectual Property Statement
The 5-axis CNC ultrasonic guilloche equipment and its corresponding processing method are independently developed by our company Shenzhen Guanglijin Technology Co., Ltd. The technology has been authorized with national invention patents and is strictly protected by national intellectual property laws.
Our company owns the complete, independent and exclusive intellectual property rights of the above technology.
Without written authorization, no institution or individual may copy, use, transfer or disseminate the relevant technology.
Our company continuously safeguards the legitimate rights and interests of customers and partners through rigorous intellectual property protection of core technologies.
VII. Applicable Product Range
① Inner and outer surface guilloche for rings made of gold, K-gold and platinum.
② Three-dimensional pattern processing for bangles, pendants and tag charms.
③ Precision machining of settings, bases and prongs for high-end jewelry.
④ High-gloss guilloche on inner walls of hollow and openwork jewelry.
⑤ Fabrication of commemorative coins, cultural & creative precious metal ornaments and craft gold accessories.
Conclusion
The 5-axis CNC ultrasonic guilloche technology represents a pivotal breakthrough that elevates high-end jewelry manufacturing from traditional fabrication to intelligent production. Featuring exquisite texture, high efficiency, outstanding stability and long-lasting luster, it has become a widely recognized premium craftsmanship across the market and among consumers. As the exclusive patent holder of this invention, we rely on self-developed core technologies to deliver highly competitive equipment and comprehensive solutions for global jewelry enterprises, empowering product upgrading, brand value enhancement and sustained market leadership.
