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URN etd-0628106-173400 Statistics This thesis had been viewed 2369 times. Download 3509 times. Author Chun-kai Chan Author's Email Address No Public. Department Mechanical Engineering Year 2005 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 107 Title COMPETITIVE MULTI-OBJECTIVE OPTIMIZATION
OF TURNING PARAMETERS
Keyword Tool Computerized Numerical Control Surface Roughness Surface Roughness Computerized Numerical Control Tool Abstract Surface roughness, tool life, and cutting force are considered as major
objectives in the modern CNC (computerized numerical control) machining
industry. This Study thesis is proposed to experimentally perform various
turning operations with different cutting tools on an ECOCA-3807 CNC
lathe under the concerns of multiple objectives. The Taguchi method is
commenced through selection of orthogonal array for four
machining parameters (cutting depth, feed rate, spindle speed, and tool
runoff) with three different levels (low, medium, and high). Additionally, a
three-parameter (back centering, coolant, and tool extension) environmental
orthogonal array is also introduced for the deviations between
experiment and real industry to analyze the established experiment.
L (34 )
L (2 ) 4
The surface roughness is primarily selected as the quality characteristic
for the machining experiment, and the MITSUTOYO SURFTEST is utilized
to evaluate the surface roughness of machined work pieces. Through the
analytical practice of Taguchi method, the first set of optimum cutting
conditions is received. Additionally, the tool life is then considered as the
second quality characteristic, and the SONY COLOR VIDEO electronic
microscope is applied to scale the tool wear. Therefore, the second set of
optimum cutting conditions is derived through the analytical technique of
Taguchi method. Moreover, the cutting force is considered as the third
quality characteristic to be competitively challenged between the two sets of
optimum conditions. Based on the electronics circuit developed in the
previous Study thesis（NSC93-2212-E-237-007）, the control program by
Visual Basic 6.0 is moreover commenced for the cutting force simulation.
The Taguchi method is employed for the competition between two sets of
optimum conditions. The optimum cutting parameters are thus achieved
through the proposed competition technique. Furthermore, this Study thesis
proposes to exam the surface roughness and tool wear under the optimum
cutting parameters on the CNC lathe, as well as the cutting force through the
KISTLER type 9001 force sensor under the tool base.
According to research, the feed rate factors reveal obvious influence on
the surface roughness, the spindle speed and cutting depth factors reveal
obvious influence on the tool wear and cutting depth and feed rate factors
reveal obvious influence on the cutting force. By the best cuts of the
parameter the actual cutting result confirmation. The best parameter
combination of this competition mode can reach to the satisfied quality.
Advisor Committee Ming-Yung Wang - advisor
Ching-chih Tai - co-chair
Hong-jyi Yeh - co-chair
T-S Lan - co-chair
Files Date of Defense 2006-05-24 Date of Submission 2006-06-28