Compact reducable contact spherical curvature radius measuring instrument

Abstract

The invention relates to compact type variable diameter contacting spherical curvature radius measuring apparatus. It is made up of length gage, step motor, driver, microcomputer, variable radius measuring ring, and base. It can be used to measure spherical curvature radius, flatness and arc outline degree. Its philosophy of measurement is as follows: the length gage is used to measure the sphere arrow height; the microcomputer works out the spherical curvature radius and radius size of the measuring ring according the demand which can be changed by the step motor; the length gage measures the sphere arrow height again; then the spherical curvature radius can be worked out according to the formula. The invention has the features of small size, compact structure, big measuring ring radius variable range, and high measuring precision.

Description

technical field [0001] The invention relates to a measuring instrument, in particular to a compact variable-diameter contact type measuring instrument for the radius of curvature of a spherical surface element. technical background [0002] The spherical curvature radius measuring instrument is a measuring instrument for the curvature radius of spherical elements. Since precision spherical components are one of the main components in precision machinery, instrumentation, aerospace equipment and optical manufacturing industries, it is of great practical significance to study and discuss the measurement of high-precision spherical curvature radius. At present, there are two main measurement methods for spherical curvature radius: one is non-contact, mainly using optical interference methods, such as Newton ring interferometer using the principle of equal thickness interference, but it mainly measures some glass components with specular reflection properties . The other is th...

AI Technical Summary

Problems solved by technology

Since the beginning is to roughly estimate the radius of curvature of the spherical surface to be measured, and then make a judgment, select a suitable measuring ring, and then conduct a detailed measurement, and when measuring different spherical curvature radii to be measured, it is necessary to select measuring rings with different radii. In the process, it is necessary to constantly load, unload and replace the measuring rings with different radii, which inevitably introduces a lot of random errors and human errors, which greatly reduces the measurement accuracy.

And the number of measuring rings with different radii is limited, there are only a few sets of measuring rings with fixed radii, so when measuring spherical components to be tested, it is impossible for all spherical components to be tested to achieve the highest precision

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