(3) Measurement of the overall error of the meshing point scanning bevel gear
The bevel gear meshing point scanning measurement method proposed by Chengdu Tool Research Institute is a rolling measurement on the bevel gear single-face meshing inspection instrument according to the design and installation position, using a special measuring bevel gear and the bevel gear to be single-sided meshing. The "basic" geometry of this bevel gear pair is exactly the same as the geometry of the bevel gear pair being measured. Corrugation or sticking is used in the measurement to make the required tooth profile or tooth direction measurement ridge on the gear teeth between the large and small measuring gears. The ridge line is measured by measuring the tooth profile or tooth direction of the bevel gear. The measured bevel gear tooth surface contact transmission, completes the overall error measurement of the meshing point scanning of the bevel gear. The number of measuring paths is related to the number of measuring gear teeth, generally 6 in 3+3. The overall error measurement of the bevel gear meshing point scan uses the principle of “local reference relative measurementâ€. The specific measurement steps are as follows: According to the actual sports car/testing experiment (or experience) of the bevel gear pair, the factory selects the bevel gear pair that can best meet the requirements of use as the “reference†bevel gear pair (referred to as local reference), its The tangential comprehensive deviation, one tooth tangential comprehensive deviation and the contact zone morphology were confirmed as the main reference indicators for evaluating the accuracy of the pair of bevel gear pairs. The measuring bevel gear meshes with the local reference bevel gear, and the integrated tooth profile deviation is measured on the bevel gear single-face meshing inspection instrument (local reference bevel gear pair - measuring reference bevel gear pair, the same below), comprehensive tooth deviation Bureau-measurement, tangential comprehensive deviation bureau-measurement, one-tooth comprehensive deviation bureau-measurement, contact zone shape bureau-measurement and three-dimensional tooth surface comprehensive deviation topography map-measurement, etc., and was confirmed as batch bevel gear inspection evaluation Reference reference data for the main accuracy index of the single bevel gear. The bevel gear and the measuring bevel gear of the tested workpiece are measured in the same way, and the workpiece bevel gears of the deviations are measured—the measuring bevel gear data; the corresponding deviation-work data is obtained by calculation (ie the workpiece bevel gear is relative to the local reference cone) The deviation of the corresponding precision index of the gear). Then, based on the measured work-to-office deviation data and the specified tolerance range of the accuracy index, the quality and interchangeability level of the bevel gear are determined.
The overall error measurement method of the bevel gear is simple, fast and reliable, and has rich measurement information, which is especially suitable for mass production. Since special measurement gears must be used for measurement, this measurement method should not be used for single-piece small batch measurement. However, since the bevel gear overall error measuring instrument also has the function of the bevel gear rolling inspection instrument, it can be fully used for the comprehensive precision detection of single-piece small batch bevel gear pair and the trial cutting and machine tool debugging of mass production workpieces.
3 Conclusion
By reviewing the current status and development of the research field of bevel gear measurement technology in recent years, the paper introduces the technology, method and corresponding instruments for the overall error measurement of bevel gears at home and abroad. The continuous development of the integrated error measurement technology of the mesh-type point-scan bevel gear developed by China has gradually been recognized by domestic and foreign counterparts; the bevel gear overall error measuring instrument developed according to this technology is being pushed to the production line and continues to improve in the measurement practice. . It is believed that relying on the integral error measurement technology of the meshed point-scan bevel gear to establish a beacon gear batch product accuracy database, it is entirely possible to use the computer-aided measurement technology to realize the automatic fast matching of the arc bevel gear according to the use requirements.
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