2026-09-20T19:25:27Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/22038 2023-07-10 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Lin, Shih-Chieh 2011-05-07T13:26:59Z 2011-05-07T13:26:59Z 10000-01-01 1989 Vibration control is one of the most important issues in the metal cutting process. It has been recognized for several decades that many machining process performance measures are influenced by vibrations: e.g., surface finish, tool wear, and cutting force characteristics. Vibrations result in a poor surface finish of the machined workpiece, reduce the life of the cutter, accelerate machine tool system component wear, and may lead to an unacceptable noise level in the work environment. The use of variable speed cutting for vibration control in the face milling process is a relatively new concept. The variable speed approach has the added feature of flexibility. When cutting conditions or part geometry are changed, the speed trajectory can easily be changed to reduce vibrations. This can be accomplished in software rather than hardware, thereby making this technique potentially quite practical. The use of variable spindle speed cutting for vibration control in face milling process has been studied. Both simulation and experimental results show that the self-excited vibrations that can occur during constant speed cutting, and hence limit the possible size of cut, can be suppressed by continuously varying the spindle speed. Through both analytical and experimental studies, the shape of the variable speed trajectory has been examined, in terms of both the trackability by the spindle servo system and performance in terms of vibration suppression. It was found that a sinusoidal wave because of its acceleration and jerk characteristics can be tracked more precisely than some other periodic waves. The dynamic face milling force model was used to study the effects of speed trajectory parameters, namely, speed variation frequency and amplitude. Results, in general, show variable speed cutting to be fairly robust to the specific nature of the machining situation in terms of both processing conditions and system dynamics. Speed trajectory design was, however, shown to be somewhat dependent upon the nominal cutting speed and dominant frequencies of the system. Made available in DSpace on 2011-05-07T13:26:59Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9010937.pdf: 8254598 bytes, checksum: 920a8fba452a3748fc8c11a7ffc9d822 (MD5) Previous issue date: 1989 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:54:54Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:25:33-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9010937 (UMI)AAI9010937 http://hdl.handle.net/2142/22038 eng Copyright 1989 Lin, Shih-Chieh Engineering, Mechanical The use of variable spindle speed for vibration control in face milling process text Mechanical and Industrial Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.