Hanggi inspects sealing rings at 7,200 parts/hour with 0.004mm precision using VisionPro

Hanggi GmbH manufactures sealing rings for automotive fuel injection pumps where fuel pressure exceeds 2,000 bar (29,000 PSI). These sealing rings require surface inspection for scratches and contamination plus dimensional checks of inside and outside diameters, all at high speed and with thousandths-of-a-millimeter precision.

Working with iTECH Engineering AG, Hanggi deployed the iNSPEC 50 inspection system using Cognex VisionPro software. The system uses three camera control stations: telecentric optics for geometric accuracy, multi-stage lighting (dark-field, dome, and coaxial) for surface inspection of top and outer sides, and a bottom-view station. Parts are tracked via stepping motor synchronization on a glass ring transport system.

The system achieved a testing speed of 2 parts per second (7,200 parts/hour) with precision of 0.004mm. VisionPro eliminated the need for laborious preprocessing of image data by focusing only on critical features. Application development for new product requirements was expedited. Flawless sealing rings are automatically sorted into batches of 2,000.

• Multi-stage lighting (dark-field, dome, coaxial) is essential for thorough surface inspection of reflective metal parts
• Vision software that ignores non-critical appearance variations eliminates time-consuming image preprocessing
• Automated 100% inspection at high speed ensures quality for safety-critical automotive sealing components