A method for measuring the curved surface and outer diameter of the spiral inner raceway of a ball nut

Abstract

The present invention discloses a measurement method of a ball nut spiral inner roller path surface and outer diameter. A laser triangular displacement sensor is employed to measure, and laser displacement sensors are arranged at the external portion of a nut flange; a measurement head with a prism stretches into the nut, a horizontal light ray is converted to a vertical light ray, the axial section contour of a nut inner roller is scanned, the axial section contour is converted to a normal section contour through space conversion to obtain left and right arcs, after noise point processing iscompleted, the fitting of the arcs is performed through the simplex algorithm based on least squares to perform nut outer diameter measurement, two symmetrically arranged laser displacement sensors perpendicular to the bus axis are employed, and two standard quantity rods are employed as reference to obtain the outer diameter of the nut. Through mathematical analysis, the normal section (radiusesand centers of circles of the left and right arcs) of the nut inner roller, a lead, a middle diameter jerk value and the outer diameter of the nut can be measured.

Description

technical field [0001] The invention belongs to the field of ball nut detection, in particular to a method for measuring the curved surface and outer diameter of the spiral inner raceway of a ball nut. Background technique [0002] As an important component of the ball screw pair, the ball nut has an important influence on the screw pair, and the parameter error of the inner raceway surface and outer diameter of the ball nut spiral directly affects the friction and wear, precision maintenance, life, and rigidity of the screw pair. and vibration noise. In order to improve the product performance of the domestic ball screw pair, it is necessary to test the parameters of the ball nut spiral inner raceway surface and outer diameter. [0003] At present, due to the unique structure of the ball screw nut, the indirect method or contact sensor is generally used to measure the raceway profile of the ball screw nut. Use the grinding wheel to test the sample, cut the obtained sample...

AI Technical Summary

Problems solved by technology

[0003] At present, due to the unique structure of the ball screw nut, the indirect method or contact sensor is generally used to measure the raceway profile of the ball screw nut. Use the grinding wheel to test the sample, cut the obtained sample along the axis, and then project it on the large screen to observe the profile of the raceway section. If the requirements are met, use the grinding wheel as the standard processing of this type of raceway Tools, this method needs to cut the nut to cause damage to the test piece, and the human factor is very large, and the repeatability of the measurement result is poor; the contact measurement uses a profiler for measurement, the probe penetrates into the nut and crawls along the raceway, and the profiler can be enlarged The raceway profile of the signal, this method has high requirements on the installation reference, and does not take into account the influence of the helix angle, the error is large, and the efficiency is low

Regarding its outer diameter, it is generally measured with a micrometer, which is not accurate and has not been automated

[0004] To sum up, at present, the online detection of the parameters of the ball nut spiral inner raceway surface and outer diameter is still blank.

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