Chatter stability prediction in ball-end milling of thin-plate parts

ZHAO Tong; CAI Chentong; WANG Yongfei; BIAN Pengxi; ZHANG Yibo

doi:10.16511/j.cnki.qhdxxb.2022.21.015

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Journal of Tsinghua University(Science and Technology) ›› 2022, Vol. 62 ›› Issue (9) : 1474-1483. DOI: 10.16511/j.cnki.qhdxxb.2022.21.015

MECHANICAL ENGINEERING

Chatter stability prediction in ball-end milling of thin-plate parts

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Abstract

In ball-end milling of thin-plate parts, the chatter stability is analyzed using a three-dimensional multiple degrees of freedom milling dynamic model. The influence of the circular arc area left by the previous cutting on the tool– workpiece contact area is considered. The cutting force coefficients are identified by the average cutting force method. The modal parameters of the tool and workpiece are obtained via the hammer experiment. The stability lobe diagram (SLD) at each measurement point of the workpiece is obtained using the full-discretization method. Both theoretical and experimental results show that the variations in the dynamic characteristics at each point of the workpiece will change the SLD. Moreover, several closed unstable "island" regions are detected in the SLD. The unstable "island" region is attributed to the modal stiffness, modal frequency, and modal damping ratio of the workpiece.

Key words

ball-end milling cutter / thin-plate parts / stability lobe diagram (SLD) / chatter

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ZHAO Tong, CAI Chentong, WANG Yongfei, BIAN Pengxi, ZHANG Yibo. Chatter stability prediction in ball-end milling of thin-plate parts[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(9): 1474-1483 https://doi.org/10.16511/j.cnki.qhdxxb.2022.21.015

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