In recent years, the Phoenix 500HCT CNC bevel gear rolling inspection machine launched by Gleason has the measurement functions of the rolling inspection machine and the single-face meshing inspection instrument. It can measure the tangential comprehensive error of the bevel gear and digitally measure the bevel gear. Contact area, three-dimensional structural noise analysis, etc. The advanced features of this model represent the current level of development of this type of product. Although expensive, there are already individual users in China. Similar to this, there are CNC bevel gear inspection machines such as Klingberg GKC60 and Olympus T50.
2.3 Overall error measurement method and instrument
The overall error measurement of the bevel gear is based on the same rotation angle displacement coordinate, and all the individual geometric errors measured by the detection points on the bevel gear working tooth surface are integrated into one bevel gear overall error map according to the meshing order, and based on this, The analysis and measurement of the bead gear single geometric accuracy, the comprehensive motion accuracy and the bevel gear pair contact state are completed, and the evaluation and monitoring of the performance and quality of the bevel gear are realized. The overall measurement method and instrument for bevel gears can be divided into two types. One type is coordinate geometry analysis measurement method, which is divided into "point-to-point measurement method" and "point scan measurement method". The instruments used in both methods are CNC gear measurement centers, but the measurement software package is used. The other type is the meshing motion geometry measurement method (ie, the meshing point scanning measurement method, which is the first in China). The instrument used is a bevel gear single-face meshing inspection instrument with a dedicated measuring bevel gear. And measurement software packages.
(1) Measurement of the overall error of the coordinate point-to-point bevel gear
On the gear measurement center, the three-dimensional probe is used to measure the detected tooth surface at a predetermined distance along the tooth profile and the tooth direction of the bevel gear (usually 5 on the tooth profile and 9 on the tooth direction). , a total of 45 points) geometric error is measured little by little. This method can avoid the friction between the 3D probe and the measured tooth surface during measurement and affect the measurement results. The measurement method adopts the principle of “direct measurementâ€. The specific steps are as follows: firstly, according to the adjustment parameters of the bevel gear machining machine and the geometric parameters of the tool, the geometric parameters of the ideally machined tooth surface of the processed large and small bevel gears are obtained by calculation; The tooth surface is used as a reference tooth surface, and compared with the tooth surface of the large and small gears which are actually processed (or after heat treatment), and the geometric deviation between the actual tooth surface and the ideal tooth surface is measured. By means of the special MATCH program, the machining parameters of the imaginary machine tool corresponding to the measured actual tooth surface are determined. Then the TCA analysis is performed according to the meshing model, and the tangential comprehensive deviation and contact condition of the bevel gear pair are calculated to check whether the requirements are met. If necessary, the corresponding software will recalculate and adjust the machine tool processing parameters according to the measurement results, so that when the test is repeated, the product with more satisfactory quality can be processed.
(2) Measurement of the overall error of the coordinate point scanning bevel gear
A method for point scan measurement of the bevel gear tooth surface by a two-dimensional probe using a two-dimensional probe proposed by Osaka Seiki recently has obtained reliable and satisfactory measurement results. The method has the following characteristics: by controlling the rotation of the workpiece and the parallel displacement movement of the probe, the adverse effect of the friction between the probe and the tooth surface is avoided; since the scanning measurement method is adopted, the measurement area can cover the entire tooth surface including The top of the tooth and the area close to the large and small ends; there are many choices for the measurement path. Generally, the number of teeth and the number of teeth are 3, a total of 6; the number of samples on each scan line can reach 113 points, due to The high sampling density reflects the small waviness on the tooth surface (this ripple is often the main source of unpleasant noise and is difficult to measure with conventional point-to-point measurements). The method adopts the principle of “conjugation measurementâ€. The specific steps are as follows: Firstly, according to the machining parameters and tool parameters of the machine, the geometric parameters of the ideal tooth surface of the large gear are calculated, and the virtual phase with its conjugate and no transmission error is calculated. The tooth surface geometric parameters of the conjugate pinion; the actual machining of the large gear tooth surface and the ideal machining large gear tooth surface are compared and measured, and the relative deviation of the tooth profile and the tooth direction is detected; the actual machining of the pinion tooth surface and calculation The obtained virtual conjugate pinion tooth surface is comparatively measured, and the relative deviation of the tooth profile and the tooth direction is detected. According to the measured relative deviation, the three-dimensional tooth surface comprehensive deviation topography, the tangential comprehensive deviation and the contact shape (including contact path, contact area shape, size position, etc.) of the bevel gear pair are calculated. Through physical measurement, comparison verification, the measurement results of point-to-point measurement and point-scan measurement are consistent.
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