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Contemporary Machining Processes
material to be machined, and the machining conditions. Its principle is
shown in Figure 1.6.
2. In the wire EDM, a wire electrode, usually 0.05 to 3.0 mm in diameter, is
fed through an upper and lower diamond guide. Wire position is controlled
by a computer program which contains the required path of the wire. The
electrode is used only once and is discarded afterward. This form of EDM
is the most accurate and can be used for both rough and finish machining
(Palanikumar and Davim, 2013). A schematic of the wire EDM is presented
in Figure 1.7.
A 0.05- to 0.3-mm wire (2) is a moving electrode without a specific shape. Its movement is usually performed along two coordinates, so that complex 2D contours
can be produced with high accuracy, using short pulses of low energy. The wire is
rewound continuously by the pulley and guides mechanism, while the workpiece (1)
is moved in a perpendicular plane.
3. The third type of EDM is the micro EDM mill, where the electrode has
diameters of 50 μm to 10 mm. The process is similar to the conventional
die-sinking EDM, but the complex shape electrode is replaced by a set of
standardized moving electrodes. The micro EDM provides for drilling pilot
holes through heat-treated materials and carbides, e.g., deep cavities up to
10 mm with nearly vertical walls of 1.5° taper, or to machine very thin ribs
below 0.1 mm. This technology is an important application in micromachining (Palanikumar and Davim, 2013).
From the perspective of distinctive kinematics, the rotary tool EDM should be
mentioned (Dhakar and Dvivedi, 2017). In this process, presented in Figure 1.8,
FIGURE 1.7 Schematic of wire EDM: 1 – Machined workpiece, 2 – Wire, 3 – Dielectric
liquid supply.
Contemporary Machining Processes
material to be machined, and the machining conditions. Its principle is
shown in Figure 1.6.
2. In the wire EDM, a wire electrode, usually 0.05 to 3.0 mm in diameter, is
fed through an upper and lower diamond guide. Wire position is controlled
by a computer program which contains the required path of the wire. The
electrode is used only once and is discarded afterward. This form of EDM
is the most accurate and can be used for both rough and finish machining
(Palanikumar and Davim, 2013). A schematic of the wire EDM is presented
in Figure 1.7.
A 0.05- to 0.3-mm wire (2) is a moving electrode without a specific shape. Its movement is usually performed along two coordinates, so that complex 2D contours
can be produced with high accuracy, using short pulses of low energy. The wire is
rewound continuously by the pulley and guides mechanism, while the workpiece (1)
is moved in a perpendicular plane.
3. The third type of EDM is the micro EDM mill, where the electrode has
diameters of 50 μm to 10 mm. The process is similar to the conventional
die-sinking EDM, but the complex shape electrode is replaced by a set of
standardized moving electrodes. The micro EDM provides for drilling pilot
holes through heat-treated materials and carbides, e.g., deep cavities up to
10 mm with nearly vertical walls of 1.5° taper, or to machine very thin ribs
below 0.1 mm. This technology is an important application in micromachining (Palanikumar and Davim, 2013).
From the perspective of distinctive kinematics, the rotary tool EDM should be
mentioned (Dhakar and Dvivedi, 2017). In this process, presented in Figure 1.8,
FIGURE 1.7 Schematic of wire EDM: 1 – Machined workpiece, 2 – Wire, 3 – Dielectric
liquid supply.