Abstract
Ball parts assembled in rolling bearings are finished by the lapping process. Usually, the ball parts are lapped while rolling between coaxial circular grooves machined on the two laps. These grooves have a V shape or a semicircular cross section. The difference between radius of the semicircular cross-sectional grooves and the radius of the ball parts is very small. The high conformity, which stands for degree of agreement between the radius of the balls and the grooves, lead to a high sphericity of the ball parts. However, in the case of lapping with a large stock allowance, a form error which has three lobes along the circumference of the cross section increases. In this report, the lapping condition and mechanism of increase in the form error with three lobes are experimentally investigated. A small decrease in conformity between the ball parts and the grooves results in an increase in the form error. In this condition, gap between the ball and groove becomes enough large for a form error of the ball to give rise to displacement of the ball mass center.
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