GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018
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Subject Code: 2171913 Date: 15/11/2018Subject Name: Metal Forming Analysis
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain briefly Two Dimensional Mohr’s stress circles. 03
(b) Give Classification of Metal Forming Processes and Explain any one in details. 04
(c) The stress state at a point is given by
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T={ 5 3 2 3 10 4 2 4 6
Determine the normal and shear stress components on a plane which is equally inclined to the three axes. The stresses are in N/mm? 07
Q.2 (a) Define (i) Strain hardening, (ii) Strain rate. 03
(b) Give classification of Rolling Mills. 04
(c) Prove Hencky’s first theorem for Slip Lines with usual notations. 07
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OR(c) Briefly explain the 2-Dimensional Graphical representation of Von Mises’ and Tresca’s yield criteria for plastic deformation. 07
Q.3 (a) Explain briefly various Rolling defects. 03
(b) Define angle of bite and discuss its effect in rolling process. 04
(c) Derive the formula for Rolling Load using Slab Method with usual notations. 07
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OR Q.3 (a) Briefly explain metal flow in compression of circular disc between two flat dies. 03
(b) Differentiate open die forging and closed die forging. 04
(c) Derive the equation for rate of work done due to deformation for compression of a strip in plane strain considering the first term of Upper Bound Theorem. 07
Q.4 (a) Explain clearance in sheet metal operation. 03
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(b) Differentiate between punching and blanking. 04(c) Explain the analysis of Strip Drawing process with usual notations. 07
OR
Q.4 (a) Explain wet drawing and dry drawing. 03
(b) Describe hydrodynamic lubrication in wire drawing with neat sketches. 04
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(c) Explain deep drawing process and forces in circular cup drawing with neat sketches. 07 Q.5 (a) Differentiate direct and indirect extrusion process. 03
(b) Explain spring back effect in bending process with a neat sketch. 04
(c) Explain (i) Forming Limit diagram and, (ii) Anistrophy in sheet metal 07
OR
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Q.5 (a) Briefly explain Forming limit curve with a neat sketch. 03
(b) Differentiate Hot working and Cold working of metals. 04
(c) Explain various operations performed on sheet-metal press machine. 07
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