TOKK Linear Modules Empower Intelligent Inspection of Smartphone Mid‑Frames
As smartphones continue evolving toward higher screen-to-body ratios, more curved surfaces, and thinner, lighter designs, the middle frame—the structural component that houses the screen, battery, mainboard, and other core parts—has an appearance quality that directly affects overall assembly precision and user experience. With the mature application of artificial intelligence and deep learning algorithms, intelligent inspection equipment is gradually replacing traditional manual visual inspection, enabling 360° flawless appearance defect detection of smartphone middle frames.TOKK linear modulesWith high rigidity, high repeat positioning accuracy, and diversified transmission methods, they undertake the core tasks of precision motion and positioning in five-axis intelligent inspection all-in-one machines, helping inspection equipment achieve a 99.9% detection accuracy and a throughput of 1,200 pcs/h.
Smartphone Middle-Frame Inspection
The manufacturing of smartphone middle frames involves multiple processes such as CNC machining, polishing, and anodizing, during which appearance defects such as scratches, pressure marks, tool marks, and color deviations are highly prone to occur. As middle-frame materials diversify from aluminum alloy to titanium alloy, stainless steel, and beyond, and as curved-surface designs grow more complex, traditional manual microscope inspection can no longer keep up.
The core technical approach of the intelligent inspection all-in-one machine lies in: adopting advanced machine vision and deep learning algorithms, and through a five-axis mechanical structure design, achieving one-stop 360° flawless appearance defect detection for all categories of smartphone middle frames. Equipped with combined lighting, the equipment effectively solves the industry challenge of multi-curved-surface inspection; with four-station high-speed flash photography, it achieves a throughput of up to 1,200 pcs/h and a detection accuracy of 99.9%. The loading end is equipped with an anti-static ionic air knife that effectively removes attached foreign objects such as lint and dust, reducing the overkill rate and helping to improve yield.
In this complex inspection system, the linear modules that carry the camera and workpiece to complete multi-axis motion serve as the "precision cornerstone" that guarantees inspection accuracy and efficiency.
TOKK linear modules
Smartphone middle-frame intelligent inspection all-in-one machines involve various motion scenarios: large-load inverted handling, precision positioning, high-speed flash photography, and multi-axis coordination. With its rich product matrix and solid technical strength, TOKK linear modules provide customers with flexible, well-adapted solutions.
High-rigidity structure for large-load inverted handling
In real-world applications at customer sites, large-load inverted handling is a major technical challenge. With its high-rigidity design and large-load capability, TOKK linear modules have successfully solved this challenge. Even under inverted mounting, the modules maintain stable accuracy and rigidity, ensuring the middle frame experiences no deviation or jitter during handling, and providing reliable positional assurance for subsequent inspection processes.
Micrometer-level repeat positioning accuracy ensures inspection correctness
TOKK linear modules achieve micrometer-level repeat positioning accuracy, ensuring the precise and error-free relative position between camera and workpiece. In five-axis inspection equipment, the modules carry the camera or inspection head to perform high-precision scanning motion, guaranteeing imaging stability and providing the motion assurance for the 99.9% detection accuracy.
Diversified transmission methods to suit different scenario requirements
For long-stroke high-speed transmission scenarios, TOKK offers belt-driven modules, suitable for the rapid transfer of middle frames between different stations, maximizing efficiency together with four-station high-speed flash photography. For precision positioning, clamping, and handling scenarios, TOKK ball-screw-driven modules, with their high-precision and high-stability performance, are widely used in automation fields such as electronic component assembly and positioning/insertion operations.
Five-axis platform overall solution
TOKK not only supplies single-category module products, but also provides customers with overall technical guidance and solutions for five-axis platforms. Drawing on its accumulated expertise in linear transmission, TOKK assists customers in completing system integration and commissioning optimization of five-axis platforms, ensuring that each axis maintains synchronization and precision during high-speed flash photography and guaranteeing long-term stable equipment operation.
Application Value
The smartphone middle-frame intelligent inspection all-in-one machine equipped with TOKK linear modules has achieved significant benefits in actual production:
Inspection accuracy assurance: micrometer-level repeat positioning accuracy ensures the precise and error-free relative position between camera and workpiece, providing the motion assurance for the 99.9% detection accuracy.
Production efficiency improvement: the long-stroke rapid transmission of high-speed belt modules combined with the four-station flash-photography design achieves efficient operation at 1,200 pcs/h.
Reliable large-load handling: high-rigidity modules solve the industry challenge of large-load inverted handling, ensuring the middle frame experiences no deviation during handling.
Flexible adaptation: combinations of multiple module series enable the equipment to accommodate middle-frame inspection requirements of different materials and sizes, enabling rapid changeover.
This solution has been deployed at scale in the smartphone middle-frame intelligent inspection field, covering fully automatic appearance inspection of middle frames made of various materials including aluminum alloy, titanium alloy, and stainless steel.
Conclusion
From the precision machining of middle frames to 360° flawless appearance inspection, every quality upgrade of smartphones relies on the support of automated inspection equipment. With high rigidity, high precision, and diversified transmission methods, TOKK linear modules provide complete and reliable motion solutions for smartphone middle-frame intelligent inspection all-in-one machines. From large-load inverted handling to high-speed flash-photography positioning, TOKK modules, with their excellent performance, help inspection equipment achieve higher efficiency and higher yield. In the future, TOKK will continue to deepen its expertise in the precision motion control field, providing higher-quality products and services for 3C electronics manufacturing.
About TOKK
- About Us -
TOKK Robot (Suzhou) Co., Ltd. is controlled by the Linchen Group. Currently, Linchen has two wholly-owned subsidiaries: Suzhou Xunya Automation Technology Co., Ltd. and TOKK Robot (Suzhou) Co., Ltd. (TOKK), which are respectively engaged in robot sales and the R&D, production, and sales of linear transmission products. With outstanding performance in specialization, refinement, differentiation, and innovation, the company was awarded the title of "Little Giant" enterprise specializing in new and unique technologies by the Ministry of Industry and Information Technology in 2025, marking a new milestone in its development. Moving forward, it will continue to drive the development and innovation of China's smart manufacturing industry.
Product Overview Table
TOKK focuses on the R&D, production, and sales of high-precision granite platforms, linear motor modules, linear transmission modules, electric cylinders, KK modules, servo presses, and other products. Our products mainly serve major industries such as 3C electronics, lithium batteries, photovoltaics, panels, and semiconductors, and are widely used in dispensing, handling, scanning, and movement, meeting the diverse application scenarios of customers.
