Unconventional Machining Process March06 Nr410309

NR

Code No: NR410309

IV B.Tech I Semester Supplementary Examinations, March 2006 UNCONVENTIONAL MACHINING PROCESS ( Common to Mechanical Engineering and Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) What are the common materials used for manufacturing tools used in USM. [8] (b) Write a short note on tool wear in USM.

[8]

2. (a) With the help of neat sketch explain the mechanism of material removal in abrasive jet machining process. [3+5=8] (b) What are the factors affecting the material removal rate in abrasive jet machining? Explain. [8] 3. (a) Compare Electro Chemical Machining with a single point machining and describe the differences. [4+4=8] (b) What are the limitations and industrial applications of Electro Chemical Machining? [4+4=8] 4. (a) Explain the process of Chemical Machining and its advantages.

[4+4]

(b) What are the important industrial applications of Chemical Machining?

[8]

5. Sketch & explain the working of wire EDM. Explain its advantages over conventional EDM. [4+4+4+4] 6. What are the different forms of current pulses used in E.D.M.? Explain why a trapezoidal pulse results in more anode metal removal and less cathode metal removal. [6+10] 7. (a) What are the specialities and typical processing advantages of lasers? [4+4] (b) Give the thermal features and analysis of laser beam machining.

[4+4]

8. Derive an expression for the pressure to be applied by the hydraulic system in hydrostatic extrusion. [16] ?????

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