Abstract
Cutting toolholders, with designed in-built compliant mechanisms, are frequently used for machining microfeatures. In this paper, compliant structures are designed using trusses as they exhibit a superior strength-to-weight ratio. Systematically stacked two-stage truss structures along with flexure hinges are designed to yield the desired precise cutting motion. The materially reduced efficient design amplifies the output force and greatly assists in overcoming cutting resistance during machining. The characteristics of the designed compliant tool holder are analysed by considering the output force and displacement for a given input. Both mathematical modelling to determine the force and finite element analysis to identify the critical stress regions when subjected to a prescribed input displacement are presented. As part of dynamic analysis, modal analysis and harmonic response studies were performed to determine how the trussed compliant structure deforms when subjected to dynamic loadings. The designed tool holder was additively manufactured using functionally rigid polyamide-12-glass-bead (PA12-GB) material. The performance of the developed cutting tool holder is then verified by machining radially graded surfaces following which, the machining results are presented in this paper.
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Acknowledgements
The diamond turning experiments were conducted with the assistance of Mr Yeo Eng Huat from NUS’s Advanced Manufacturing Lab.
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This research was funded by Singapore’s Ministry of Education. Funding number R 265-000-690-114.
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Paniselvam, V., Kumar, A.S. Design of a truss-structured compliant toolholder for machining of structured surfaces. Int J Adv Manuf Technol 126, 3489–3501 (2023). https://doi.org/10.1007/s00170-023-11321-4
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DOI: https://doi.org/10.1007/s00170-023-11321-4