Abstract
Excessive tool wear can shorten tool life and cause low machining surface quality and efficiency in the milling of Ti-6AI-4 V thin-walled workpieces. The influence mechanism between the tool flank wear and stability predication is of significant for its further development in milling Ti-6Al-4 V. However, the relationship between tool flank wear and stability predication needs to be further investigated as the effect of time-varying tool flank wear is ignored in conventional methods. In this work, a system stability prediction model considering time-varying tool flank wear effect in milling of Ti-6AI-4 V thin-walled workpiece is proposed. The tool flank wear region is discretized into differential elements, and then, the friction effect and process damping effect caused by extruding function between tool and workpiece are analyzed, and a time-varying milling force model is established. In this process, the relationship of cutting tool flank wear band width VB and section radius difference NB is determined, and the indentation volume between tool and workpiece is iteratively calculated, which is used to investigate process damping. After, the time-varying milling force coefficients are derived considering different tool flank wear status. Then, in modal space, the evolutionary process of stability lobe diagrams considering tool flank wear effect is determined. Subsequently, to effectively predict system stability, tool flank wear curves and dynamic cutting force coefficients are calibrated by slot milling, and the average errors between cutting force prediction values considering tool flank wear effect and experimental values in feed direction and normal direction are 7.3% and 12.1%, respectively. Finally, a series of machining tests are conducted to verify the effectiveness of tool flank wear on the machining stability in the milling of Ti-6AI-4 V thin-walled workpieces to some extent, and the experimental results show that the system stability prediction accuracy of the proposed method is improved by 23.8% compared with that using conventional method.
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Funding
The authors are grateful to the National Natural Science Foundation of China (No. 52005166), the Postdoctoral Research Foundation of China (No. 2019M652534), the Henan Postdoctoral Foundation (No. 19030071), the Foundation of Henan Educational Committee (No. 20A460016), the Young Backbone Teachers Foundation Scheme of Henan Polytechnic University (No. 2019XQG-01), and the National Science Fund for Distinguished Young Scholars of Henan Polytechnic University (No. J2022-5).
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Junjin Ma, conceptualization, methodology, formal analysis, investigation, and writing — original draft; Yunfei Li, data curation, experimental verification, and methodology; Dinghua Zhang, writing — review and editing, and supervision; Bo Zhao, validation, writing — review and editing, and supervision; Xinhong Yan, data processing and experimental verification; Xiaoyan Pang, data processing, visualization, and investigation.
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Ma, J., Li, Y., Zhang, D. et al. Investigation of tool flank wear effect on system stability prediction in the milling of Ti-6AI-4 V thin-walled workpiece. Int J Adv Manuf Technol 122, 3937–3956 (2022). https://doi.org/10.1007/s00170-022-10136-z
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DOI: https://doi.org/10.1007/s00170-022-10136-z