Empowering Collaborative Robot Joints – Micro-Needle Rollers Enable Precision Transmission Performance Leap

Customer Background & Challenge
A leading domestic collaborative robot manufacturer encountered a critical technical bottleneck while developing a new generation of high-precision six-axis robots. The core rolling elements used in their joint reducers could not simultaneously meet the demanding requirements of high load capacity, low backlash, and extended service life within compact spaces. The standard needle roller products previously used by this customer exhibited excessive wear and significant positioning accuracy degradation under continuous high-frequency start-stop and impact load conditions. As a result, the robot's repeatable positioning accuracy could not be stably maintained within ±0.02mm, severely constraining product performance upgrades and market competitiveness.

Solution
Upon receiving the customer's request, Anhui Guangyang Rolling Element Bearing Co., Ltd. quickly assembled a dedicated technical team to conduct an in-depth analysis of the customer's joint module operating conditions and failure modes. Leveraging its deep expertise in micro-needle roller manufacturing technology, the company provided a customized systematic solution:
Material Upgrade: High-purity bearing steel with oxygen content ≤5ppm was selected, combined with carbonitriding heat treatment, achieving surface hardness of HRC 62-64 and significantly enhancing wear resistance and fatigue strength.
Structural Optimization: Asymmetrical logarithmic crowning design was adopted to reduce the end stress concentration coefficient from 1.8 (conventional products) to below 1.15, effectively dispersing local stress caused by impact loads.
Precision Enhancement: Roller diameter tolerance was controlled within ±1μm, with cylindricity better than 1.5μm/m, ensuring perfect fit and smooth operation of every roller within the confined installation space.
Batch Consistency: Relying on fully automated production lines, dimensional uniformity across the same batch was guaranteed, greatly simplifying the customer's assembly process.
From design validation to first batch mass production delivery, Anhui Guangyang completed the process in just 12 days, fully demonstrating its flexible R&D and agile delivery capabilities.

Results
Following rigorous durability testing and batch installation verification, Anhui Guangyang's customized micro-needle rollers delivered significant value improvements to the customer:

Metric	Before	After	Improvement
Joint Positioning Accuracy	±0.03mm	±0.025mm	+15%
Operating Noise	52dB	46dB	-11%
Service Life (Design Value)	8,000 hrs	12,000 hrs	+50%
Bearing Temperature Rise	42℃	34℃	-19%

The customer has now incorporated Anhui Guangyang's micro-needle roller products as a standard solution across its entire collaborative robot joint module lineup, establishing a long-term strategic partnership. The customer's R&D Director commented: "Anhui Guangyang not only delivered high-quality products but also demonstrated professional technical service capabilities, truly helping us break through the bottleneck in precision transmission."