| Summary: | 碩士 === 大同大學 === 機械工程研究所 === 94 === 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.
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.
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