MANUFACTURING PROCESS 2 PAPER

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MANUFACTURING PROCESSES II ME 210 4th Sem May 2k5

Max marks 60

Note: Section A is compulsory. Attempt any Four questions from section B and any two from section C.

Section A Marks 2 each

1.
(a) What do you understand by nitriding?
(b) What is the principle of operation in Laser Beam machining?
(c) What do you understand from cyaniding?
(d) Why heat treatment of welded parts is important?
(e) What is reducing flame? When is it used?
(f) What is the difference between a die and a punch?
(g) What are the purposes of dielectric fluid used in EDM?
(h) Differentiate between drawing and deep-drawing operations.
(i) What are the principal microconstituents found in annealed steels?
(j) Why not stainless steel extruded?

Section B Marks 5 each

2. Prove that for a strip drawing under plain strain conditions, the maximum reduction in area is limited to 58% when friction is neglected.

3. Explain the submerged arc welding process. What are its advantages and applications?

4. Evaluate the press capacity necessary for forging a 1 m long cylindrical bloom to hexagonal section with approximately 300 mm side if the yield stress is initially 75 N/mm2 but increases to 120 N/mm2 at the end of the operation. What maximum pressure would be expected assuming mu= 0.3?

5. Explain the principle, process and applications of case-hardened technique.

6. Define hardenability and explain a method for measuring hardenability.

Section C Marks 10 each

7.Explain the mechanism of metal removal in Ultrasonic Machining process. What are its advantages, limitations and applications?

8. Derive expression for the roll load and roll torque for cold strip rolling operation with front and back tensions present. Justify the assumptions made in the analysis.

9. Describe the various possible welding defects, their causes and remedies