2.3 Pre-installation work
The above-mentioned processed parts and the pressing ring and the selected 120 steel balls are tested on the table body, and the maximum gap of the steel ball is measured by a precision feeler gauge, and then the grinding machine is ground with a small diameter corresponding to the maximum gap. 1/3; this repeated grinding and trialing, until the gap of the steel ball is not measured, then the measured diameter size should be the calculated size. This process should be handled with great care and care, and should pay attention to good cleaning and ambient temperature. When grinding, the grinding wheel should pay attention to stability. The outer circle and the end surface should be ground at the same time. When the parts are mounted on the mandrel and rotate between the two thimbles of the grinding machine, the maximum vibration should not exceed 0.01 mm.
The hardness of the base cylindrical surface is preferably above HRC55, the hardness is low, and the indentation is generated after the steel ball is loosened a plurality of times. When an indentation occurs, the indexing accuracy decreases.
2.4 Method for measuring the accuracy of the base disc
The specific method can use multi-faceted prisms and collimators, or the collimator can be used to measure the error by comparing the mirrors.
3 use examples
In this device, the pre-selection accuracy of the steel ball is less than 0.002 mm, and the maximum cumulative error of the equal-division accuracy is 4 seconds by using a 1 second collimator and a mirror. Using this indexing plate, the ¢120mm, 120-division tooth plate which is ground on the spline grinding machine is preliminarily determined. After meshing, the number of meshing is calculated to be more than 95?, along the tooth height and the tooth width upper contact surface. After reaching 70?, the pair of sprocket wheels are mounted on the turret power head for comprehensive inspection, and the aliquot error is within 0.02 mm (repetitive positioning error), which greatly improves the processing accuracy.
4 Notes
(1) When assembling the compression ring, when the steel ball is in contact with the inclined surface, it is appropriate to keep the gap between the compression ring and the table body within 0.1 mm.
(2) The steel ball of the indexing plate is compacted by the above structure, and how much torsion torque can be withstood, and further tests are needed. (At present, from the actual use situation, the device is used for grinding precision scribe lines, drill holes and other small holes can achieve relatively high indexing accuracy), for the machining of large torque or impact force, use this The indexing plate is not suitable.
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