USN 10M855

Fifth Semester B.E. Degree Examinationo Dec.2013 lJan.20l4

Time: 3 hrs.

Manufacturing Process - lll

Note: Answer FIVEfull questions, selectingat least TWO questionsfrom each part.

Max. Marks:100

PART - A1 a. How the metal working processes are classified? Explain. (06 Marks)

b. Deflaq-re-crystallization. Distinguish hot working from cold working. (06 Marks)c. Defive,,an expression for the following with respect to yield criteria for duCtile material:

D Von-Mises or distortion energy criterm

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or maximum shear stress criteria. , (08 Marks)ii) Tresca r fress criteria.

2 Explain the following parameters which affects the metal working processes:a. Temperature b. Strain rate effbctsc. Hydrostatic pressure d. Deformation zone geometry (20 Marks)

Explain with sketch the procedural steps involved irr'forging operation. (06 Marks)

c.

4a.b.

c.

A solid cylindrical slug made of stainless steel ii 150 mm diameter and 100 mm height. It isreduced in height by 50% at ioom temperature by open die forging with flat dies. Assume pas 0.2 and flow stress as 1000 MPa" calculate forging force at the end of the stroke.106 Marks)Derive an expression for slab analysis to determine the mean pressure for closed die forging.

(08 Marks)

Explain with sketch any three t1p9s of rolling mills. (09 Marks)Derive an expression to determine the roll force and power required in rolling operation.

Determine the maximu* pnsiiur. reduction for cold rolling a 300 mm slab *n r(ff ft[?rolling when p is 0.5?

' ,,,,,,,,, "" PART - BExplain with.skbtch the wire drawing and rod drawing operat5a.

b.

and the roll diameter is 660 mm. What is the maximum,ieduction o mill for hot05 Marks)

{bh rvru'r.9Determillo-the drawing stress to produce 20%o reduction in a 10 imean floW stress o is given as 637 MPa. The die angle is 1

llflire. The

determine the power required to draw u,hen the wire is moving thro 3mlsec.

c. Explain with sketch any two methods of tube drawing.

6 a. Explain with sketch the direct extrusion and indirect extrusion processes.b. Explain with sketch the following eitrusion processes:

i) Cold extrusion ii) Hydrostatic extrusion and iii) Impact extrusionc. Explain in detail the deformation, lubrication and defects in extrusion.

7 a. Explain with sketch the progressive die and combination die in sheet metal forming.106 Marks)b. Explain with sketch the following operations in sheet metal forming:

;09. Also

(06 Marks)(06 Marks)

,0u,,*r.u.

(0e MarryI :

(05 Marks)

(09 Marks)(05 Marks)

i) Deep drawing ii) Stretch forming iii) Rubber press formingc. Mention defects in sheet metal formed parts.

8 a. Explain with sketch the following high energy rate forming methods:i) Explosive forming; ii) Electro hydraulic forming; iii) Electromagnetic forming. (t2 Marks)

b. Explain different steps in powder metallurgy process. (08 Marks)

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