Measurement and optimization of multi-response characteristics in plasma arc cutting of Monel 400™ using RSM and TOPSIS
Measurement and optimization of multi-response characteristics in plasma arc cutting of Monel 400™ using RSM and TOPSIS
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DOI：
10.1016/j.measurement.2018.12.010
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发表时间：
2019-03-01
期刊：
影响因子：
5.6
通讯作者：
Davim, J. Paulo
中科院分区：
文献类型：
--
作者：
Ananthakumar, K.;Rajamani, D.;Davim, J. Paulo
等离子弧切割（PAC）是一种公认的非常规加工工艺，广泛用于高温合金和复合材料等各种导电材料的复杂零件加工。PAC表面的尺寸精度和表面质量是特定应用的关键因素，特别是在航空航天和制造业中。材料去除率（MRR）、上下表面切口锥度（KT）和热影响区（HAZ）是影响等离子切割表面质量和性能的重要属性。研究了电弧电流、切削速度、间隙距离和气体压力等PAC参数对Monel 400高温合金MRR、KT和HAZ等零件质量特性的影响。采用Box-behnken设计方法制定实验，并进行了严格的实验分析。开发了二次模型，并使用方差分析（ANOVA）评估了其性能。通过统计和响应面分析，确定了对PAC影响最大的参数。采用多准则决策方法（MCDM），采用与理想解相似优先排序技术（TOPSIS），进行多目标优化研究，确定PAC的最优切削条件。确定了最佳PAC工艺参数为切割速度2400 mm/min、气压3 bar、电弧电流45 A、间隔距离2 mm。通过显微组织分析，确定了不同切削条件下的切削表面形貌。(C) 2018 Elsevier Ltd.版权所有。
Plasma arc cutting (PAC) is well recognized non-conventional machining processes widely used to fabricate intricate part profiles for diverse electrically conductive materials including superalloys and composites. The dimensional accuracy and surface quality of PAC surface are critical elements for specific applications especially in aerospace and manufacturing industries. Material removal rate (MRR), kerf taper (KT) at top and bottom surface and heat affected zone (HAZ) are very important attributes which influences the quality and performance of plasma cut surfaces. Present study investigates the effect of PAC parameters such arc current, cutting speed, stand-off distance and gas pressure on evaluating the part quality characteristics such as MRR, KT and HAZ of Monel 400 superalloy. Box-behnken design approach is incorporated to formulate the experiments and rigorous experimental analysis is performed. The quadratic models are developed and assessed for its performance using analysis of variance (ANOVA). Statistical and response surface analysis are accomplished to identify the most influencing PAC parameters. Multi-objective optimization studies are carried out using Multi-criteria decision making methodology (MCDM) to determine the optimal cutting conditions of PAC through employing technique for order of preference by similarity to ideal solution (TOPSIS). The optimal PAC process parameters such as cutting speed of 2400 mm/min, gas pressure of 3 bar, arc current of 45 A and stand-off distance of 2 mm are determined. Microstructure analysis is conducted to ascertaining the morphologies of cut surface at various cutting conditions. (C) 2018 Elsevier Ltd. All rights reserved.