By Hassan Abdel-Gawad El-Hofy
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Additional info for Advanced Machining Processes
When cutting fiber-reinforced plastics, reports showed that the increase in machining rate and use of the small nozzle diameter increased the width of the damaged layer. Jet fluid. Typical pressures reported by McGeough (1988) are 150 to 1000 MPa, which provide 8 to 80 kW of power. 20 Workpiece terminology. 21 Factors affecting WJM performance. increase in pressure allows more power to be used in the machining process, which in turn increases the depth of the cut. Jet velocities range between 540 to 1400 m/s.
Traditional, also termed conventional, machining requires the presence of a tool that is harder than the workpiece to be machined. This tool should be penetrated in the workpiece to a certain depth. Moreover, a relative motion between the tool and workpiece is responsible for forming or generating the required shape. The absence of any of these elements in any machining process such as the absence of tool-workpiece contact or relative motion, makes the process a nontraditional one. Traditional machining can be classified according to the machining action of cutting (C) and mechanical abrasion (MA) as shown in Fig.
Recent applications of micromachining include silicon micromachining, excimer lasers, and photolithography. 01 µm that can also be measured using laser instruments, and optical fibers. Future trends in micromachining include laser and electron beam lithography and superhigh-precision grinding, lapping, and polishing machines. In such cases high-precision laser beam measuring instruments are used as indicated by McGeough (2002). The desired high-precision nanomachining requirements can be obtained by removing atoms or molecules rather than chips as in the case of ion beam machining.
Advanced Machining Processes by Hassan Abdel-Gawad El-Hofy