Mold Positioning and Measurement Path Planning System Based on Binocular Structured Light

In mold production, the diversity of inserts and complexity of the workshop environment often require operators to manually perform positioning and measurement using coordinate measuring machines (CMM), leading to inefficiencies and operator dependency. To address this, we propose an automated positioning and measurement path planning system for mold inserts based on binocular structured light. A phase unwrapping method integrating dual-frequency heterodyne with dual complementary phase encoding is introduced, effectively suppressing phase jump errors and enhancing 3D measurement performance on reflective surfaces. The system computes measurement points from the 3D-scanned insert data and autonomously generates a CMM inspection path, enabling fully automated and precise measurement. Experimental results demonstrate that the vision system achieves high-quality 3D reconstruction of reflective objects, with a measurement error of less than 0.02 mm and an overall positioning accuracy within 0.08 mm. The system meets industrial precision requirements while significantly improving efficiency and robustness, enabling automation in mold production.