A study on the chatter characteristics of the thin wall cylindrical workpiece

✍ Scribed by J.Y. Chang; G.J. Lai; M.F. Chen

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 545 KB
• Volume: 34
• Category: Article
• ISSN: 0890-6955
• DOI: 10.1016/0890-6955(94)90080-9

✦ Synopsis

The purpose of this study was to analyze the chatter characteristics of a thin wall cylindrical workpiece. Initially, the structural dynamics of the workpiece were investigated, then the chatter phenomenon during the cutting experiment were observed. From the results, it was clear that the value of the stiffness coefficient of shell mode decreases rapidly when the ratio between the inner diameter and the wall thickness increases. In the meantime, the value of the damping ratio for shell mode was very small. The high value of dynamic compliance causes the shell mode to be easily excited.

x, NOMENCLATURE depth of cut, mm workpiece inner diameter, mm workpiece outer diameter, mm deflection in direction y deflection in direction z total deflection in direction y natural frequency of beam mode (m = 1), kHz natural frequencies of shell mode (m = 1, 2, . .; n = 2, 3 .... ), kHz chatter frequency, kHz workpiece thickness, mm static stiffness ( P/e~, N/lxm) stiffness coefficent of beam mode (Kt = P/el) N/p,m stiffness coefficient of shell mode (Kt2 = P/e2) N/l~m overhang length of workpiece the number of nodes in axial mode shape the number of circumferential waves radial static acting force feed rate, mm/rev cutting velocity, m/min the distance from cutting position to the check, mm damping ratio of beam mode (m = 1) damping ratio of shell mode (m = 1, n = 2) 1. INTRODUCTION