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Documents: Advanced Search Include Citations. Authors: Advanced Search Include Citations. Shabana Mehfuz , Dr. Abstract Abstract — Cloud computing has no doubt become the buzzword in the IT industry today. Keyphrases five-phased approach cloud migration migration process challenge organization security issue influential technology large corporation cloud adoption face educational institution many organization new phenomenon promising business concept new cloud migration model long term benefit abstract cloud computing various type last year new era migration challenge cloud computing industry today.

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Error: Please make sure the Twitter account is public. Create a free website or blog at WordPress. RSS 2. Euphoria Fans Euphoria the Indian Band. All fans are invited to write comments as this is the Fan Club. Share this: Twitter Facebook. Like this: Like Loading Published on September 13, at am Comments On November 16, at pm raj said:. On May 5, at am Swapnil said:. On November 17, at pm Keerthi said:. On May 11, at pm jay said:. On May 13, at pm Jay Sondarva said:.

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The dielectric B4C showed that Ra and Ry increased with pulse duration fluid is continuously fed to the machining zone to convey but decreased with current [6]. On the other hand, EDM of the spark and flush away the eroded particles. The work high-speed steel showed that with current Ra increased feeding system of micro ED milling is similar to mechan- while with pulse duration it decreased [7].

It was suggested ical end milling process. The workpiece is fed to the tool to use low conductive or higher resistive dielectric to ensure electrode while the tool is in rotation. The movement of low Ra and Ry [11]. Use of rotating electrode was helpful tool is controlled numerically to achieve the desired shape for high shape accuracy and higher MRR but it caused and accuracy of the workpiece. Figure 1 shows the higher surface roughness [13].

There was no analysis schematic of the micro ED milling process. Micro ED milling has a number of process parameters, The wear of tool electrode is responsible for shape which are influential on the machining performance. Depend- inaccuracy and dimensional instability. At higher feed rate, ing upon the circuit type used in the machine, the importance tool wear was found decreasing [4].

It was also observed that of parameters is also varied. Some researches were conducted tool wear was increasing with feed rate but after reaching the to optimize different EDM process parameters for Ra, Ry, peak it started decreasing [14].

But almost all of them were on usually caused high TWR [8]. The full understanding of micro and boron carbide B4C , tool wear was found rising with ED milling process parameters are yet to be developed, as current and falling with pulse duration [6, 7]. It was also the process itself is a new branch of manufacturing. However, use of shorter discharge energy. It was experimentally investigated that pulse on time was suggested to achieve lower TWR [16]. At high current settings, the polarity has no significant effect on tool wear.

A slight decrease in TWR was observed with increasing current in negative polarity. In the case of positive polarity, TWR decreased significantly with increasing current [17]. The type of dielectric fluid is also responsible for tool wear rate. Kerosene is frequently used as the dielectric medium. In EDM, carbide layer formed on the workpiece surface with the use of kerosene, which has a higher melting temperature than the oxide layer formed with the use of distilled water.

The carbide layer formed by kerosene needed higher pulse energy for melting and evaporation which caused high tool wear [18]. The use of low resistive deionized water as a dielectric fluid resulted in reduced tool wear compared to kerosene [19].

With the increase in pulse duration, MRR showed a peak and then downfall [7, 12]. Increase in discharge energy by discharge voltage or capacitance resulted in higher MRR [14]. Lower Fig. MRR can be increased in both positive and effects of the three process parameters on Ra, Ry, TWR, and negative polarity by rotating the tool electrode [13]. Higher MRR. A total number of 32 experiments was conducted, MRR was obtained for low ultrasonic vibration frequency which includes five repeated experiments at the same combined with tool rotation [20].

The experimental con- Dielectric flushing system is also responsible for the ditions are shown in Table 1. It examines and explains the influence of three 2. The paper explains the use of developed models the workpiece material. It possesses very high thermal for multiple-response optimization.

These features enable it to become a suitable mold material. As the tool electrode material, tungsten W was chosen because of its low wear 2 Experiments rate.

The electrode diameter was 0. In this subsection, the experimental design used to conduct the 2. Selection of workpiece, tool materials, and the equipments used are also addressed. RC circuit ensures low discharge The experiment was designed based on three-level full current with higher frequency and thus, suitable in factorial statistical model, which was chosen to observe and microscale electric discharge.

As the dielectric liquid, analyze the individual influences as well as the interaction EDM-3 synthetic oil was used for the experiments. The analysis ultimately showed the main and was fixed in the worktable. After clamping, the spindle was interaction effects of the process variables on the responses. Figure 1 schematically depicts the experimental while interaction effect was the joint effect of two setup.

After ultrasonic cleaning, the the Tables 3, 4, 5, and 6, respectively. In the table, SS represents sum of squares while df represents the number of degrees of 3 Results and discussions freedom. The column corresponding to MS is obtained simply by dividing SS by its corresponding df. Column of probability values Table 2 Design matrix of the experiment and measured responses Exp no.

The specific power transformation was chosen within the confidence level, 3. Thus, the developed was developed for Ra, as shown below in Eq. The model F value of The P value of each of these factors indicates the confidence level is more than where, The P value of factor A feed rate and interaction factor AC has insignificant influence over Ra as it provides very The effects of feed rate—voltage and capacitance—voltage high P values.

The lack of fit F value of 0. Ra is strongly the lack of fit is not significant compare to the pure error. With the increase of capacitance from 0.