A method for testing surface precision of coating film

Abstract

The invention discloses a method for testing the profile accuracy of a coated surface, comprising the following steps: measuring the coordinate values of the centers of theodolite target balls and thereference holes of a coated surface in a double-theodolite intersection measurement coordinate system; obtaining the spatial coordinate values of the centers of the theodolite target balls in a coated surface reference coordinate system by reference conversion; replacing the double-theodolite target balls with tracker target balls, and measuring the spatial coordinate values of the centers of thetracker target balls in a tracker measurement coordinate system by laser tracking measurement; using a tracker to scan and measure the trajectories and spatial coordinate values of the center pointsof the tracker target balls in the tracker measurement coordinate system by means of spatial scanning measurement; obtaining the coordinate values of the trajectory of the center point of a scanning tracker target ball in the coated surface reference coordinate system by reference conversion; and obtaining the profile accuracy of the measured coated surface according to the normal deviation between the spatial coordinate values of the points on the trajectory of the center point of the scanning tracker target ball in the reference coordinate system and the theoretical model of the coated surface in the reference coordinate system.

Description

Technical field [0001] The invention relates to a method for testing the surface profile accuracy of a coating, and belongs to the technical field of antenna mechanical measurement. Background technique [0002] The size of the Ka sub-reflector of a relay satellite S / Ka antenna is 400mm. It is formed of paper honeycomb material. The surface adopts an etching coating process. The electrical performance index of the antenna is required, and its surface accuracy is extremely high. Therefore, its shape is required in the development stage Put forward high-precision, high-reliability testing requirements. [0003] The traditional surface measurement methods mainly include theodolite rendezvous measurement, photogrammetry, articulated arm contact measurement and coordinate measuring machine contact measurement. However, due to the characteristics of the etching and coating of the surface, in order to protect the coating from damage, the surface cannot Paste the measuring target with adh...

AI Technical Summary

Problems solved by technology

[0003] The traditional surface measurement methods mainly include theodolite intersection measurement, photogrammetry, articulated arm contact measurement and three-coordinate measuring machine contact measurement. However, due to the characteristics of the surface etching coating, in order to protect the coating layer from damage, the surface cannot be Paste the measuring target with glue layer, and at the same time theodolite intersect measurement, articulated arm and three-coordinate measurement surface multi-point efficiency is low, and the accuracy cannot be guaranteed. The three-coordinate measuring machine needs special clamping tooling, but the clamping is very easy to cause paper honeycomb Distortion of the material and the datum cannot be unified

In short, the existing traditional measurement methods have been unable to meet the measurement work of the surface profile accuracy

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