Gear and moulding structure outline measuring method based on template near-field light projection scanning

Abstract

The invention relates to a gear and moulding structure outline measuring method based on template near-field light projection scanning. A template which is same with the cross section of teeth or a tooth groove of a measured gear is manufactured according to the shape of a measured gear and placed into the tooth groove of the measured gear; then, an illuminating light source is installed at one side of the template, and the outline data of the surface of an object are obtained by utilizing a triangular relationship comprising a CCD or an image sensor and an edge projection; and aiming at each tooth on the gear, the measured gear is rotated by an angular division coding device to carry out repeated measurement to completely measure the geometrical shape and parameter of the whole gear. The invention can realize micron-grade shadow projection, therefore, the measurement precision along the surface normal direction can reach more than 5 microns in the outline measurement of moulding structures, such as a counter gear, and the like. The transverse resolution reaches more than 20 microns, and the measurement speed reaches more than 5,000 point/second. The invention is particularly suitable for the quality detection of gear processing. The technology can also be used for the surface outline measurement of other structural elements.

Description

technical field [0001] The invention belongs to a method for measuring a three-dimensional profile of an object surface, in particular to a method for measuring a profile of a gear and a molding structure based on template near-field light projection scanning. Background technique [0002] With the development of industry, more and more product manufacturing needs high-precision measurement methods and instruments to ensure the quality of products. Optical measurement methods have the advantages of non-contact, fast and high-precision measurement, and have been favored by researchers at home and abroad. Extensive attention and research, the main measurement methods are the measurement methods using contact three-coordinate measuring machine and laser triangulation technology, but although the three-coordinate measuring machine has high measurement accuracy, its measurement efficiency is low, especially for When measuring large objects such as large gears, due to the limitati...

AI Technical Summary

Problems solved by technology

[0002] With the development of industry, more and more product manufacturing needs high-precision measurement methods and instruments to ensure the quality of products. Optical measurement methods have the advantages of non-contact, fast and high-precision measurement, and have been favored by researchers at home and abroad. Extensive attention and research, the main measurement methods are the measurement methods using contact three-coordinate measuring machine and laser triangulation technology, but although the three-coordinate measuring machine has high measurement accuracy, its measurement efficiency is low, especially for When measuring large objects such as large gears, due to the limitation of the measurement range, the measurement accuracy will be greatly reduced. At the same time, the error dispersion caused by the influence of the environment in the point-by-point measurement of the three-coordinate measuring machine is large, and it is difficult to compensate; and the laser Triangulation technology is affected by factors such as the size of the spot, the width of the light knife, and the influence of laser light scattering on the metal surface, and the accuracy is usually lower than 50 microns. Therefore, the existing methods are difficult to meet the measurement requirements

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