Download GTU BE/B.Tech 2017 Winter 7th Sem New 2171913 Metal Forming Analysis Department Elective I Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2017 Winter 7th Sem New 2171913 Metal Forming Analysis Department Elective I Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2017
Subject Code: 2171913 Date:02/11/2017

Subject Name: Metal Forming Analysis(Department Elective - I)

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.


MARKS

Q.1 (a) Explain clearance in sheet metal operation. 03
(b) How do you represent strain hardening effect? 04
(c) State general advantages of metal forming. 07

Q.2 (a) Define (i) dry drawing (ii) wet drawing (iii) tube drawing. 03
(b) State difference between hot forming and cold forming. 04
(c) What do you understand by camber of sheet and camber of roll? 07
OR
(c) Explain two dimensional Mohr?s Stress circles. 07
Q.3 (a) What do you understand by shear on punch and die? 03
(b) Explain spring back effect in bending process. 04
(c) State and prove Hencky?s First theorem. 07
OR
Q.3 (a) Define angle of bite and discuss its effect in rolling process. 03
(b) State various factors which affect the FLD (Forming Limit
Diagram).
04
(c) Explain VonMises & Tresca theory of yielding.

07
Q.4 (a) State types of rolling mills used in rolling process. 03
(b) Differentiate direct and indirect extrusion process. 04
(c) What is drawability? List and discuss factor affecting to
drawability.

07
OR
Q.4 (a) What is upset forging? 03
(b) What are the benefits of hydrostatics extrusion process? 04
(c) Explain Isotropic and Kinematic work hardening with neat
sketches.

07
Q.5 (a) Why friction measurement is necessary in forming process? 03
(b) How is impression die forging different from closed die
forging.
04
(c) A circular cylinder of 100 mm diameter and 160 mm height is
compressed to 40 mm height between two flat dies at 1000
0
C.
taking that there is a sticking friction over the entire contact are
of disc, determine the maximum die pressure and average die
pressure. The yield strength at 1000
0
C is 75 N/mm
2
.
07
OR

Q.5 (a) Discuss on materials used for making wire drawing dies. 03
(b) State difference between compound and progressive dies. 04
(c) How does hydrostatic pressure affect the yield strength of
metal?
07

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