Um fabricante japonês de dispositivos médicos alcançou repetibilidade de posicionamento de 1,8 mícron e reduziu a taxa de rejeição de 4% para 0,3% usando as guias MGN12 grau P2 e os fusos de esferas retificados SFU1204 da Dongfeng.
Customer Challenge
A medical device manufacturer in Japan required ultra-precision linear motion components for an automated insulin pump assembly station. The station needed positioning repeatability within 2 microns to place micro-valves with sub-millimeter tolerances. The previous linear guide system could not maintain repeatability after thermal expansion cycles, causing a 4% rejection rate in the final product inspection.
Dongfeng Solution
Dongfeng supplied MGN12 miniature linear guides in P2 accuracy class paired with SFU1204 ground ball screws featuring 4mm lead for fine positioning resolution. Both components were manufactured in stainless steel 440C for corrosion resistance and biocompatibility compliance. Each set was individually tested for positioning repeatability using laser interferometry, with test certificates documenting sub-2-micron repeatability at 22°C and 28°C.
Results & Value
The MGN12 + SFU1204 combination achieved 1.8-micron positioning repeatability, exceeding the 2-micron target. Thermal stability testing across 5 temperature cycles showed no repeatability drift. The product rejection rate dropped from 4% to 0.3%, saving the customer an estimated $180,000 per year in scrapped components. The customer expanded the solution to 2 additional assembly stations.
Key Specifications
- Products: MGN12 miniature guide + SFU1204 ground ball screw
- Accuracy: P2 grade
- Repeatability: 2 microns
- Rail length: 200mm
- Screw lead: 4mm ground
- Material: Stainless steel 440C
- Batch size: 60 sets
- Certification: CE, SGS, ISO 9001