Abstract
In an expected motion curve, signal attenuation or delay is often caused by the control model of a machine or its operating efficiency. Thus, the expected motion state often differs from the actual motion state. In addition, stamping products may have unexpected defects. In this study, the effect of motion curve errors on the forming properties of a direct-drive servo press was explored. First, a mechanical model of a direct-drive servo press was developed to rate theoretical motion curves. Subsequently, a laser measurement system was used to measure actual motion curves. The motion curve errors were optimized using integrated error criteria, and the most suitable integrated error criterion was identified to yield the smallest error. In addition, the optimized motion curve distribution was determined. Finally, the finite-element method was adopted to explore the V-bending manufacturing process and assess the changes in mechanical properties before and after motion curve optimization. The study results revealed that among the four adopted integrated error criteria with different stroke velocities, the integral square error criterion was the most suitable. This criterion can effectively reduce the differences between theoretical and actual motion curves. Accordingly, the aforementioned criterion was adopted for optimization, and the forming time was improved by 0.258–15.07%. According to V-bending simulations, the actual motion curves exhibited a strain rate attenuation of 8.74–20.98% at a stroke velocity of 5–20 strokes/min.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This study was financially supported by Taiwan’s Ministry of Science and Technology (MOST 108–2221-E-992–064-MY3) and the Frontier Mould & Die Research and Development Center from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project of Taiwan’s Ministry of Education.
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The authors’ contributions are as described in the following text. All the authors conceived and designed the study. Cheng-Yu Yang, Chun-Chih Kuo, Kuo-Wang Liu, and Po-Hsien Li performed the theoretical deductions, experiments, finite-element simulations, process optimization, and analyses. Tse-Chang Li and Cheng-Yu Yang contributed to the interpretation of the results. Chun-Chih Kuo, Kuo-Wang Liu, and Po-Hsien Li were the main authors involved in writing the manuscript. Tse-Chang Li, Chun-Chih Kuo, and Bor-Tsuen Lin also contributed to manuscript writing. All the authors provided critical feedback and helped shape the research and analysis presented in this paper.
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Li, TC., Kuo, CC., Yang, CY. et al. Influence of motion curve errors of direct-drive servo press on stamping properties. Int J Adv Manuf Technol 120, 4461–4476 (2022). https://doi.org/10.1007/s00170-022-09014-5
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DOI: https://doi.org/10.1007/s00170-022-09014-5