A gear three-dimensional structure construction device and method

By using a combination of gear pose adjustment module and mandrel in the measurement of small module gears, the rotation axis is accurately calibrated and a unified coordinate system is established, which solves the problem of reference error in multi-view measurement of small module gears and improves the accuracy and reliability of tooth surface reconstruction.

CN122107994AActive Publication Date: 2026-05-29CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Filing Date
2026-04-28
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies make it difficult to accurately establish the spatial relationship between the gear mounting axis, the mandrel axis, and the actual rotation axis of the turntable in multi-view measurement of small module gears. This leads to reference errors affecting the accuracy and reliability of tooth surface reconstruction, and there is a lack of effective methods for extracting tooth surface regions.

Method used

The method combines a gear pose adjustment module with a mandrel, uses a reference cylindrical section as a rotation reference calibration carrier, and uses a multi-degree-of-freedom adjustment bracket to obtain the original tooth surface and mandrel point cloud data. Combined with the control and calculation module, the real rotation axis is calibrated, a unified rotation coordinate system is established, and the point cloud data is filtered by radial distance threshold and effective tooth width range.

Benefits of technology

It effectively eliminates the reference deviation caused by clamping eccentricity and mandrel installation errors, improves the accuracy and reliability of tooth surface reconstruction, and provides high-quality three-dimensional structural data, laying the foundation for subsequent gear morphology analysis and quality evaluation.

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Abstract

The application discloses a gear three-dimensional structure construction device and method, which uses a reference cylindrical section on a core rod as a rotating reference calibration carrier, does not need to additionally introduce external calibration components, avoids dismounting errors and problems of inconsistency between calibration states and measurement states. A multi-view measurement module flexibly adjusts the position and angle of a measurement sensor module through a multi-degree-of-freedom adjusting support, can simultaneously acquire original tooth surface point cloud data and core rod point cloud data in a single scanning, and ensures the synchronism and integrity of data acquisition. A control and calculation module calibrates a real rotating shaft based on geometric invariants of the direction included angle and the shortest distance between the multiple single-pose core rod shafts relative to the same real rotating shaft, establishes a unified rotating coordinate system based on the real rotating shaft, performs coordinate transformation on the original tooth surface point cloud data in different indexing postures, and effectively eliminates reference deviations caused by clamping eccentricity, core rod installation errors, turntable rotation errors and the like.
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