| Summary: | 碩士 === 龍華科技大學 === 機械系碩士班 === 93 === The aim of this study is to see the effect of using various manufacturing parameters, like a different cutting tool, cutting depth, cutting rate and feed rate, on the milling property of the super alloy of nickel Inconel 718. In addition, the ideal manufacturing result was expected with the association with the ultrasonic vibration and a cooling gas. With experimental orthogonal arrays of Taguchi methods, the best level combination of cutting parameters was obtained by treating surface roughness, cutting power, work hardening and cutter wear as the features for analysis. Many times of cutting were applied from a single cutter until it was invalid for cutting. The cutting process was recorded and analyzed to construct the milling mechanism of a cutter.
In the experimental result, it was indicated that taking air or argon as the cooling gas was able to efficiently suppress the cutter wear in a low cutting rate. However, the cooling gas of liquid nitrogen of the low temperature did not effectively suppress the property of strength at high temperature during the cutting of the super alloy of nickel Inconel 718, which meant there was no remarkable effect on the suppression of cutter wear. Besides, cutter wear had also been suppressed with the association with the ultrasonic vibration of 28 KHz and the better surface roughness of a work piece was obtained. After the experiment, it was also shown that the best combination of cutting parameters was obtained by using the cutting tool of HC 844 (ISO P20-P30), low cutting rate and low cutting depth which were associated with the gas cooling and the ultrasonic vibration (28 KHz as the frequency). In the construction research of wear mechanism, it was found that friction affected the wear the most; the addition of a nano coolant could assuredly eliminate the friction and improve the condition of flank wear to prolong the life of a cutting tool. Moreover, it was found that the greater feed rate led to the more serious work hardening level of the super alloy of Inconel 718 when studying on the parameters of the effect of work hardening.
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