Curved surface local normal vector measuring method based on vortex dot matrix

Abstract

The invention belongs to the technical field of detection, and relates to a curved surface local normal vector measuring device and method based on a vortex dot matrix.In the measuring method, a three-point method is adopted to conduct normal vector measurement on a local curved surface, and a normal vector of a tiny plane is formed by three measuring points at an envelope machining position and used for approximately replacing a normal vector of a machining point.A calibration plate is driven by a bi-directional rotating table to rotate, and relative position calibration under a machine tool coordinate system is completed by sensors according to output changes of all the sensors in the vortex dot matrix.The vortex probe dot matrix is driven by the numerical control machine tool to scan and measure a measured part according to a measuring path planned in advance, and accurate curved surface local normal vector measuring is completed through tilt angle error compensation and normal vector calculation data processing.The curved surface local normal vector measuring device is suitable for scanning and measuring the curved surface local normal vector of the precise metal part in an on-machine mode and is compact in structure, the measuring method is accurate, easy to operate, reliable and high in measuring efficiency.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a device and method for measuring a local normal vector of a curved surface based on an eddy current lattice. Background technique [0002] Surface normal vector measurement is the key technology in the aircraft skin mirror image processing system and aircraft panel automatic drilling processing system. The measurement accuracy of the normal vector directly affects the remaining wall thickness of the skin and the verticality and diameter parameters of the hole. These parameters are the key parameters that affect the processing quality. To solve the above problems, the attitude of the actuator can be adjusted according to the measurement feedback by installing a normal vector measuring device on the end effector. At present, the surface normal vector measurement often adopts optical measurement methods, using multiple laser sensor arrays or multiple laser beam proje...

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the invention is to overcome the deficiencies of the existing methods. Aiming at the problem that it is difficult to accurately measure the normal vector of the curved surface of aluminum alloy precision parts during processing, a method for measuring the local normal vector of the curved surface based on the eddy current lattice is invented. Three eddy current displacement sensors are used in the eddy current array, which has the advantages of non-contact measurement and no reflection interference; the influence of mutual coupling interference between multiple sensors in the eddy current array is suppressed, and the accuracy of normal vector measurement is improved.

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