Roundness measuring device, method and program for measuring roundness
First Claim
1. A roundness measuring device for obtaining an eccentric position of a measured object with respect to a rotation axis in measuring roundness of the measured object with a detector unit, by rotating and driving the measured object or the detector unit about the rotation axis with a rotary drive unit, the roundness measuring device comprising:
- a measurement acquisition unit obtaining, as measurements, rotation angles of the measured object provided by the rotary drive unit and distances from the rotation axis to a surface of the measured object, the distance corresponding to the rotation angle; and
an eccentricity calculation unit setting a circular correction circle with its center position provided as variable parameters, calculating the center position of the correction circle that minimizes sum of squares of distances between each of the measurements and the correction circle, in a direction from each of the measurements toward the center position of the correction circle, and determining the calculated center position of the correction circle as the eccentric position.
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Accused Products
Abstract
A roundness measuring device obtains an eccentric position of a measured object with respect to a rotation axis in measuring roundness of the measured object by rotating and driving the measured object. The roundness measuring device includes: a measurement acquisition unit obtaining, as measurements, rotation angles of the measured object and distances from the rotation axis to a surface of the measured object, the distance corresponding to the rotating angle; and an eccentricity calculation unit setting a circular correction circle with its center position provided as variable parameters, calculating the center position of the correction circle that minimizes sum of squares of distances between each of the measurements and the correction circle, in a direction from each of the measurements toward the center position of the correction circle, and determining the center position of the correction circle as the eccentric position.
11 Citations
9 Claims
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1. A roundness measuring device for obtaining an eccentric position of a measured object with respect to a rotation axis in measuring roundness of the measured object with a detector unit, by rotating and driving the measured object or the detector unit about the rotation axis with a rotary drive unit, the roundness measuring device comprising:
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a measurement acquisition unit obtaining, as measurements, rotation angles of the measured object provided by the rotary drive unit and distances from the rotation axis to a surface of the measured object, the distance corresponding to the rotation angle; and an eccentricity calculation unit setting a circular correction circle with its center position provided as variable parameters, calculating the center position of the correction circle that minimizes sum of squares of distances between each of the measurements and the correction circle, in a direction from each of the measurements toward the center position of the correction circle, and determining the calculated center position of the correction circle as the eccentric position. - View Dependent Claims (2, 3)
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4. A method of measuring roundness using a roundness measuring device for obtaining an eccentric position of a measured object with respect to a rotation axis in measuring roundness of the measured object with a detector unit, by rotating and driving the measured object or the detector unit about the rotation axis with a rotary drive unit, the method comprising:
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a measurement acquisition step of obtaining, as measurements, rotation angles of the measured object provided by the rotary drive unit and distances from the rotation axis to a surface of the measured object, the distance corresponding to the rotating angle; and an eccentricity calculation step of setting a circular correction circle with its center position provided as variable parameters, calculating the center position of the correction circle that minimizes sum of squares of distances between each of the measurements and the correction circle, in a direction from each of the measurements toward the center position of the correction circle, and determining the calculated center position of the correction circle as the eccentric position. - View Dependent Claims (5, 6)
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7. A program for measuring roundness adapted to cause an eccentric position of a measured object with respect to a rotation axis to be obtained in measuring roundness of the measured object with a detector unit by rotating and driving the measured object or the detector unit about the rotation axis with a rotary drive unit, the program causing a computer to perform:
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a measurement acquisition step of obtaining, as measurements, rotation angles of the measured object provided by the rotary drive unit and distances from the rotation axis to a surface of the measured object, the distance corresponding to the rotating angle; and an eccentricity calculation step of setting a circular correction circle with its center position provided as variable parameters, calculating the center position of the correction circle that minimizes sum of squares of distances between each of the measurements and the correction circle, in a direction from each of the measurements toward the center position of the correction circle, and determining the calculated center position of the correction circle as the eccentric position. - View Dependent Claims (8, 9)
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Specification