GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Enrolment No.
Subject Code: 2171913
--- Content provided by FirstRanker.com ---
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
Subject Name: Metal Forming Analysis
Time: 10:30 AM TO 01:00 PM
Instructions:
--- Content provided by FirstRanker.com ---
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | (a) Explain need of metal forming processes in industries. | 03 |
| (b) State difference between hot working and cold working process. | 04 | |
| (c) Explain electro-hydraulic forming process also write its advantages and disadvantages. | 07 | |
| Q.2 | (a) What constitute a state of stress at a point? | 03 |
| (b) Sketch a cross section of a tungsten carbide wire drawing die and show its different portion and their geometry. | 04 | |
| (c) Describe the stress strain relations for rigid perfectly plastic material. | 07 | |
| OR | ||
| (c) What do you understand by shear on punch and die? Discuss the relative advantages of providing shear on punch and die. | 07 | |
| Q.3 | (a) Explain Effect of hydrostatic pressure on yield strength. | 03 |
| (b) Explain velocity discontinuities along slip lines with neat sketch. | 04 | |
| (c) What is the principle of magnetic pulse forming? Describe the types of components that may be made by this process. | 07 | |
| OR | ||
| (a) What is strain hardening? | 03 | |
| (b) What is clearance? What is the effect of excessive and too small clearance? | 04 | |
| (c) Explain upset forging process with neat sketch | 07 | |
| Q.4 | (a) Why lubricants use in extrusion process? | 03 |
| (b) What is the effect of pre-straining a-component in uni-axial tension on FLD? | 04 | |
| (c) What do you understand by anisotropy of sheet metal? How do you measure it? | 07 | |
| OR | ||
| (a) Calculate the number of passes for rolling ingots of 760 X 700 mm cross-section to blooms of 250 X250 mm in a blooming mill of initial roll diameter of 1100 mm. Maximum machining allowance is 6% of initial diameter. Widening may be taken as 12% of reduction. Co-efficient of friction is 0.45 | 03 | |
| (b) State difference between direct and indirect extrusion process. | 04 | |
| (c) What are the different methods of tube drawing? Describe the salient feature of each method. | 07 | |
| Q.5 | (a) What do you understand by spring back in press working? | 03 |
| (b) How is contact length affected by elastic deformation of rolls? | 04 | |
| (c) Explain two dimensional Mohr’s circle method for stress analysis | 07 | |
| OR | ||
| (a) Define (1) Notching (2) Nibbling (3) Slitting, for press work | 03 | |
| (b) What defects may occurs in components made by extrusion process? | 04 | |
| (c) State and prove Hencky’s second theorem | 07 |
Date: 23/11/2019
Total Marks: 70
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
--- Content provided by FirstRanker.com ---