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GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019Subject Code:2171913 Date:10/05/2019
Subject Name:Metal Forming Analysis
Time:02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
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1. Attempt all questions.2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q:1 (a) Differentiate direct and indirect extrusion process. 03
(b) Explain a Forming Limit diagram. 04
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(c) What is Drawability? List and Discuss factor Affecting to Drawability 07 Q:2 (a) Define the following terms: (i) Hot forming, (ii) Cold Forming, 03
(iii) Flow Stress
(b) Explain various Rolling defects. 04
(c) Give short note on Two-Dimensional Mohr's circle method for stress 07
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analysis. OR
(c) Explain VonMises & Tresca theory of yielding. 07
Q:3 (a) Explain clearance in sheet metal operation. 03
(b) Explain spring back effect in bending process. 04
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(c) A cold roll sheet with shear strength of 350MPa & thickness of 3mm is 07to be Subjected blanking operation. The diameter of blank to be
obtained is 130mm & Clearance 0.075mm.What is the appropriate die &
punch diameter & Punch force for operation?
OR
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Q:3 (a) Determine Engineering Strain and True strain. 03(b) Explain Anistrophy in sheet metal 04
(c) Explain typical arrangement of roll & roll mills with neat sketches. 07
Q:4 (a) What do you understand by,shear on punch and die? 03
(b) Explain Wire Drawing processes in brief. 04
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(c) Explain various operations performed on sheet metal press machine. 07 OR
Q:4 (a) Define angle of bite'and discuss its effect in rolling process. 03
(b) What are the benefits of hydrostatics extrusion process? 04
(c) Explain friction board drop hammer for forging 07
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Q:5 (a) Explain Blanking operation with neat sketch. 03
(b) State difference between compound and progressive dies. 04
(c) Discuss analysis of strip rolling derive equation for projected arc length. 07
OR
Q:5 (a) Define (i) dry drawing (ii) wet drawing (iii) tube drawing. 03
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(b) How is impression die forging different from closed die forging 04(c) Explain about importance of Upper bound and Lower bound theorem in 07
metal forming.
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