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首页> 外文期刊>IJIDeM: International Journal on Interactive Design and Manufacturing >WEDM of nickel based aerospace alloy: optimization of process parameters and modelling
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WEDM of nickel based aerospace alloy: optimization of process parameters and modelling

机译：基于镍的航空航天合金的Wedm：工艺参数和建模优化

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摘要

This article presents the experimental data for the machining of Nimonic-90 on wire electrical discharge machining (WEDM). It is a nickel based alloy which possessing creep resistance and high rupture strength at high temperature. Four input process parameters, viz., peak current (Ip), pulse-on time (Ton), pulse-off time (Toff), and servo voltage (SV) were investigated and modelled for three response variables namely cutting speed (CS), surface roughness (SR) and radial overcut (RoC) utilizing Response Surface Methodology (RSM). In present experimentation, quadratic model is suggested for all three responses. Analysis of Variance (ANOVA) indicate that Ip, Ton, Toff and SV are significant process parameters influencing the CS and SR while Ip, Ton and SV were highly significant parameters influencing the RoC. Desirability function was employed to optimize the multi-performance characteristics. Using SEM micrographs and micro-hardness profile, effect of discharge energy (DE) on surface morphology was examined. Topography of machined surface; corresponds to different levels of DE; suggests that high discharge energy results in overlapped and deep craters of large size diameters and high thickness of recast layer whereas low discharge energy results into fine surface with minimum recast layer.
机译：本文介绍了在线电气放电加工（WEDM）上的Nimonic-90加工的实验数据。它是一种基于镍的合金，在高温下具有蠕变性和高裂缝强度。研究了四个输入过程参数，峰值电流（IP），脉冲接通时间（吨），脉冲关闭时间（Toff）和伺服电压（SV），为三个响应变量建模即切割速度（CS）利用响应面方法（RSM），表面粗糙度（SR）和径向过度（ROC）。在目前的实验中，为所有三个反应提出了二次模型。方差分析（ANOVA）表明IP，TON，TOFF和SV是影响CS和SR的重要过程参数，而IP，TON和SV是影响ROC的高显着参数。采用期望功能来优化多性能特征。使用SEM显微照片和微硬度曲线，检查了放电能量（DE）对表面形态的影响。加工表面的地形;对应于不同级别的de;表明，高放电能量导致大尺寸直径的重叠和深凹槽，而高厚度的重量层，而低放电能量导致具有最小素质层的细表面。

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