Multiresponse Analysis in Abrasive Waterjet Machining Process on AA 6351

Multiresponse Analysis in Abrasive Waterjet Machining Process on AA 6351

Naresh Babu Munuswamy (Saveetha Engineering College, Chennai, India) and M. Nambi Krishnan (Sri Venkateswara College of Engineering, Sriperumbudur, India)
DOI: 10.4018/ijmmme.2014100103
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This study investigates optimal parameter setting in abrasive waterjet machining (AWJM) on aluminium alloy AA 6351, using taguchi based Grey Relational Analysis (GRA) is been reported. The water pressure, traverse speed and stand-off-distance were chosen as the process parameters in this study. An L9 orthogonal matrix array is used for the experimental plan. The performance characteristics which include surface roughness (Ra) and kerf angle (KA) are considered. The results indicate that surface roughness and kerf angle decreases, with increase in water pressure and decrease in traverse speed. Analysis of variance (ANOVA) illustrates that traverse speed is the major parameter (89.7%) for reducing surface roughness and kerf angle, followed by water pressure (5.85%) and standoff distance (2%) respectively. The confirmation results reveal that surface roughness reduced by 16% and kerf angle reduced by 47%. Furthermore, the surfaces were examined under scanning electron microscope (SEM) and atomic force microscope (AFM) for a detailed study
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Experimental Work

Equipment Used

The experiments were performed on AWJM (S3015) as shown in Figure 1. It has a control system of Siemens 810D, Maximum distance between grating and nozzle is 175mm, nozzle material is made of sapphire and Maximum flow of high pressure water is 3.4litres/minute. Garnet of size 80 mesh was used as abrasives with an abrasive flow rate of 100 g/min.

Figure 1.

Experimental setup


Selection of Process Parameters and Its Levels

The process parameters were identified based on the previous work carried out by the researchers as the water pressure, traverse speed and standoff distance (Selvan et al., 2012, Caydas & Hascalik, 2008, Chen & Siores, 2003, Tosun et al., 2013, Shanmugam & Masood, 2009). The range of the parameters was selected based on the trial runs performed during preliminary machining process. The process parameters with their levels are shown in table1. Experiments were performed with three factors varied at three levels. Two replications were obtained per trial and the average of the values was considered for the study.

Table 1.
Process parameters and levels
AWater pressure(MPa)200250300
BTraverse speed(mm/min)50100150
CStandoff distance(mm)123

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