Abstract
The characteristics between the rolling balls and raceways are the key to study a linear rolling guideway (LRG). In this paper, the contact stresses of an LRG with off-sized balls incorporating the variation of the contact angle are given by the established LRG joint model. Moreover, the effect of the location, number, and the deviation degree of the off-sized balls on the stress distribution are studied. In addition, the contact stress distribution between the balls and raceway for different arrangement cases of the off-sized balls are analyzed. The random arrangement case can improve the stiffness and service life of the LRG. Based on the Archard wear theory, the wear prediction model of the LRG is established and the displacements and angular displacements of the slider caused by wear in reciprocating motion are obtained. The effectiveness of the contact stiffness and wear prediction model of the LRG is verified by simulations and analysis.
Highlights
Linear rolling guideways (LRGs), which are the main functional component to achieve low friction feed, are being widely used in machine tools, because of their superior precision-retaining ability, high positioning accuracy, and low friction coefficient, that is, not available with conventional sliding guideways,[1] and its static and dynamic characteristics directly affect the overall performance of machine tools.[2]
The results show that the existence of the off-sized balls alters the contact stiffness and the localized deformation of the race
This paper studied three cases, namely, the off-sized balls were arranged in order of large to small, small to large, and random
Summary
Linear rolling guideways (LRGs), which are the main functional component to achieve low friction feed, are being widely used in machine tools, because of their superior precision-retaining ability, high positioning accuracy, and low friction coefficient, that is, not available with conventional sliding guideways,[1] and its static and dynamic characteristics directly affect the overall performance of machine tools.[2].
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