High-precision optical fiber detecting method for roller path curved surface in ball nut

Abstract

The invention discloses a high-precision optical fiber detecting method for a roller path curved surface in a ball nut. The high-precision optical fiber detecting method includes mounting the ball nut on a motion platform, and mounting an optical fiber sensor probe relative to the central axis of the ball nut by a helical angle of the ball nut; rotating the ball nut by the motion platform, enabling the optical fiber sensor probe to move linearly by one screw pitch of the ball nut by rotating the ball nut each circle, until the optical fiber sensor probe completes detection corresponding to the inner helical line along the roller path profile of the ball nut, modulating a mathematical model of the curved according to light strength of the optical fiber sensor probe, and calculating ranging data between the optical fiber sensor probe and the roller path profile; solving the actual internal helical line space coordinate according to the ranging data and transformation relation between the workpiece coordinate system of the ball nut and the normal section coordinate system of the roller path in the ball nut. Accordingly, machining accuracy of the ball nut can be completely analyzed and evaluated.

Description

technical field [0001] The invention belongs to the field of high-precision detection of processing quality of ball nuts, and relates to a high-precision optical fiber detection method facing the curved surface of the inner raceway of the ball nut. Background technique [0002] Due to the characteristics of high efficiency, high precision, high rigidity and low cost, the ball screw nut pair is widely used in machinery, aerospace, aviation, nuclear industry and other fields. High-speed precision ball screw pair is a key component for the development of high-precision machinery. For high-precision ball screw nuts, the complex inner raceway surface greatly increases the difficulty of detection. Traditional detection methods include fixed detector method, steel ball contact method and relative measurement, but these are all contact measurements, which cannot meet the fast and high-precision detection of ball screw nut pairs. To achieve high-precision detection of ball nuts, onl...

AI Technical Summary

Problems solved by technology

At present, the non-contact measurement methods such as machine vision and optical measurement, which are currently emerging research, also have some shortcomings, which are manifested in: 1) The detection accuracy of machine vision depends too much on the shooting resolution of the camera, and the two-dimensional digital image A large number of detection indicators are lost, such as the condition of the inner raceway and the helix angle (that is, the helix angle), etc. cannot be detected, so the processing quality of the ball nut cannot be fully evaluated; On the surface, due to the limitation of the optical fiber sensing principle, the receiving optical fiber cannot receive the reflected light when the inclination angle of the measured surface is too large, and the measurement results cannot effectively explain the accuracy of the measured object

Images