The precision of gear refers to the comprehensive index of gear tooth shape, tooth clearance, tooth number and other geometric dimensions and position accuracy. Common gear precision testing methods include the following: Gear meshing test: By simulating the gear meshing movement under actual working conditions, observing the gear meshing state and sound phenomena, to evaluate the gear precision. Gear measuring instrument: The gear measuring instrument is used to measure the parameters of the outer diameter, tooth width, tooth pitch, tooth tip height and tooth root height of the gear, and analyze and compare them to evaluate the precision of the gear. Tooth thickness measurement: By measuring the size of the gear tooth thickness, to judge the manufacturing accuracy and geometric characteristics of the gear. Non-contact measurement: Non-contact measurement of gear surface using laser interferometer, laser scanner and other equipment to obtain three-dimensional data of gear surface, so as to evaluate the manufacturing quality of gear. As for the quality inspection of the gear, it usually includes the following aspects: Appearance inspection: visual inspection of the gear surface to check whether there are cracks, deformation and other defects. Size measurement: Use measuring tools (such as micrometer, vernier caliper, etc.) to measure the size of the gear, including the outside diameter, tooth width, tooth pitch, tooth tip height. Material inspection: Through chemical composition analysis, metallographic structure analysis and other methods to check the quality of gear materials. Running-in test: the gear is assembled into the actual equipment, and the running test is carried out for a certain period of time to observe its running state, such as noise, vibration and other phenomena. Functional test: The gear is assembled with other components, and the functional test is carried out, such as transmission effect, load capacity, etc. The above are some detection methods of gear precision and the general steps of gear quality inspection, the specific detection methods and test items can be determined according to the specific product requirements and application environment.
