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Research on High-Precision Measurement Method for Small-Size Gears with Small-Modulus.

Peng Niu1, Qiang Cheng1, Xinlei Zhang1

  • 1Institute of Advanced Manufacturing and Intelligent Technology, Beijing University of Technology, Beijing 100124, China.

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|August 29, 2024
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Summary

This study introduces a high-precision measurement method for small-modulus gears, addressing challenges posed by tiny gear gaps and positioning errors. The developed technique accurately evaluates machining quality, crucial for precision instruments.

Keywords:
3D point cloud dataerror modelgear measurementsmall-modulus gearsworkpiece coordinate system

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Area of Science:

  • Mechanical Engineering
  • Metrology
  • Precision Engineering

Background:

  • Small-modulus gears are vital for precision instruments but pose measurement challenges due to small gear gaps.
  • Existing measurement methods struggle with the accuracy required for evaluating the machining quality of these gears.

Purpose of the Study:

  • To propose a high-precision measurement method for small-modulus gears that accounts for positioning errors.
  • To enable accurate evaluation of the machining quality of small-modulus gears used in precision instruments.

Main Methods:

  • Development of a compound measurement platform for small-modulus gears.
  • Analysis of motion transmission using a 3D model and mathematical relationships.
  • Investigation of gear positioning error mechanisms and optimization of spatial coordinate transformation matrices.
  • Collection of tooth profile measurement points and extraction of gear error parameters (tooth profile deviation, pitch deviation) for 0.1 mm modulus, six-level accuracy gears.

Main Results:

  • A novel measurement method capable of precise evaluation of small-modulus gears under positioning errors.
  • Successful extraction of key gear error parameters based on established deviation models.
  • Verification of the method's accuracy and effectiveness through comparison with a P26 gear measuring center.

Conclusions:

  • The proposed measurement method effectively overcomes the challenges associated with measuring small-modulus gears.
  • The technique provides accurate machining quality evaluation, essential for advancing precision instrument manufacturing.