engleski

Influence of Design Parameters on the Parasitic Shift of Additively Manufactured Cross-spring Pivots

The deflection of flexible members provides at least partial mobility of compliant mechanisms. They are recognized by their high precision, lack of backlash and wear. The behavior of compliant rotational mechanisms known as cross-spring pivots, used for ultrahigh-precision positioning applications, is studied using numerical methods in this study. The findings of nonlinear finite element simulations are compared to experimental data previously published in the literature. Developed finite element model allows considering the influence non-symmetrical pivot configurations where the angle or point of intersection of the leaf springs can be varied. The developed finite element model allows the consideration of non-symmetrical pivot configurations with variable angle or point of intersection of the leaf springs. This enables evaluating the impact of the given design parameters on minimizing parasitic shifts of the pivot's geometric center. The results can be used to determine design solutions for ultrahigh-precision positioning applications. The development and availability of new technologies present a constant challenge for designers in order to provide new and innovative machine designs that will keep them competitive and successful on the targeted market. High manufacturing costs used to be the main drawback of compliant mechanisms, however with the rapid progress of additive manufacturing technologies to complex functional products, the manufacturing costs of such mechanisms have been reduced, and the manufacturing of complex monolithic and thin-walled variants has been made much easier. With regard to the obvious advantages and ease of application of compliant mechanisms, the need appeared to research the mechanisms, and consequently also to research the behavior of innovative materials, especially those that enable monolithic design and additive manufacturing of compliant mechanisms. Additive technologies use materials with a very wide range of mechanical properties, and a wide range of applications to follow, which also covers their application in compliant mechanisms. Therefore, research of the properties and behavior of innovative materials used in the design of compliant mechanism models is appropriate.

Cross-Spring Pivot, FEA Modelling ; Parasitic Shift ; Additively Manufactured

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