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

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.