The measurement principle and method of the geometric coordinate measurement method are not directly related to whether the workpiece to be tested is the transmission component and its function, use condition, installation method, processing and manufacturing principle, processing technology system, etc., and the measurement result and the quality of the workpiece are used. There is no clear connection between them. For example, when detecting the geometric accuracy of a straight bevel gear for an automotive differential mechanism on a cylindrical coordinate system (or polar coordinate system) gear measurement center, the measurement principle of the geometric coordinate measurement method is adopted, that is, the straight bevel gear is regarded as A geometric entity composed of a series of tooth profiles with specific geometric parameters, which are decomposed into geometrical elements into a family of teeth, a family of tooth rows, etc. arranged at a certain pitch.
During the measurement, the measuring head is in point contact with the surface of the measured contour, and the measured error value is a coordinate value difference obtained by comparing a measuring point on the actual tooth profile of the gear tooth with a corresponding point on the theoretical design tooth profile, that is, The geometric error value of this point. Since the geometric coordinate measurement method measures the single geometric shape and shape error of the straight bevel gear (such as tooth profile deviation, tooth deviation, pitch deviation, etc.), in general, these measurement error values ​​cannot be directly, Completely reflect or characterize the quality of the measured straight bevel gears (such as motion accuracy, motion stability, contact spots, etc.).
The basic idea of ​​the integrated motion measurement method is to simulate the motion form of the measured transmission component, and install and drive the device under test and its coupling member (or standard coupling member) according to the use mode, and use this as the basis for measurement and evaluation. The overall motion deviation of the test piece is used to assess its transmission quality. By further analyzing the measured data, other important quality information about the measured transmission components (such as vibration, noise, etc.) can also be obtained.
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