METHOD OF CHECK OF SHAPE AND DIAMETERS OF INNER SECTIONS OF LARGE- SIZED CYLINDRICAL PARTS Russian patent published in 2001 - IPC

FIELD: measurement technology; determination of diameters and lack of roundness of large-sized cylindrical parts, such as shells. SUBSTANCE: measuring unit is placed inside part and axis of rotation of device is set at accuracy of up to ± 20 % of diameter relative to axis of rotation of part. Then carrier is rotated around axis; spring-loaded measuring rod with roller at this end which rolls over surface of part under test is mounted ion guides of carrier for motion in radial direction. Present magnitudes of radius of part and angle of turn of carrier are transmitted to electronic unit (to computer, for example) at definite intervals by means of sensors; electronic unit stores results of measurements and checks angle of turn of carrier; upon performing complete revolution of carrier, position of center of gravity of part section is found through numerical integration with the use of array of magnitudes of angles and radii of check points; then, angles and radii of check points of part are recalculated relative to center of gravity of part section and perimeter and average diameter of section, maximum deviation from roundness and diameters are determined. EFFECT: reduced consumption of labor due to rough centering of axis of rotation of carrier and computer processing of measurement results; enhanced accuracy of measurements due to finding of actual center of section of part and determination of radii of section relative to this center. 2 cl, 1 dwg, 1 tbl