Design of Jigs Qp
V.SENTHIL ME
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B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2009. Seventh Semester Mechanical Engineering ME 1009 — DESIGN OF JIGS, FIXTURES AND PRESS TOOLS (Regulation 2004) (Common to B.E. (Part-Time) Sixth Semester -Mechanical Engineering Regulation 2005) Time : Three hours Answer ALL questions. PART A — (10 x 2 = 20 marks) 1. Distinguish between jigs and fixtures. 2. List the standard parts used in jigs and fixtures fabrication. 3. What is the primary function of linear bushing? 4. How can the relation of the jig plate and vise jaw be accurately controlled? 5. What are boring fixtures? How do you classify them? 6. What are welding fixtures? State the general purpose of a welding fixture. 7. What factors should be considered for selecting an appropriate press for a given job? 8. What is the function of a stripper? 9. Distinguish between a compound die and a combination die. 10. Find die clearance range for shearing a 2 mm thick aluminum sheet. PART B — (5 x 16 = 80 marks) 11. (a) What is meant by clamping? Explain the principles involved in the design of clamps? Or (b) Explain briefly the various types of errors accounted for in jigs and fixtures design. 12. (a) Design and draw a suitable drill jig to drill 4 holes of 5 mm diameter at 70 PCD on ϕ 120 mm diameter 60 mm thickness mild steel plate. Or Maximum : 100 marks
(b) Sketch and explain air operated drilling jig components. 13. (a) Design a broaching fixture to perform broaching operation on sides of a square block of size 50 mm x 50 mm. Or
Page 1 of 20
V.SENTHIL ME
www.chennaituitions.in
(b) 14.
Describe the various classification of milling fixtures. Describe
(a) How are the dies classified according to their construction? the different types.
Or (b) Find the total pressure, dimensions of tools to produce a washer 50 mm outside diameter with a 24 mm hole, from material 4 mm thick, having a shear strength of 360 N/mm2. 15. (a) Design and draw a suitable die for
www.chennaituitions.in
B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2009. Seventh Semester Mechanical Engineering ME 1009 — DESIGN OF JIGS, FIXTURES AND PRESS TOOLS (Regulation 2004) (Common to B.E. (Part-Time) Sixth Semester -Mechanical Engineering Regulation 2005) Time : Three hours Answer ALL questions. PART A — (10 x 2 = 20 marks) 1. Distinguish between jigs and fixtures. 2. List the standard parts used in jigs and fixtures fabrication. 3. What is the primary function of linear bushing? 4. How can the relation of the jig plate and vise jaw be accurately controlled? 5. What are boring fixtures? How do you classify them? 6. What are welding fixtures? State the general purpose of a welding fixture. 7. What factors should be considered for selecting an appropriate press for a given job? 8. What is the function of a stripper? 9. Distinguish between a compound die and a combination die. 10. Find die clearance range for shearing a 2 mm thick aluminum sheet. PART B — (5 x 16 = 80 marks) 11. (a) What is meant by clamping? Explain the principles involved in the design of clamps? Or (b) Explain briefly the various types of errors accounted for in jigs and fixtures design. 12. (a) Design and draw a suitable drill jig to drill 4 holes of 5 mm diameter at 70 PCD on ϕ 120 mm diameter 60 mm thickness mild steel plate. Or Maximum : 100 marks
(b) Sketch and explain air operated drilling jig components. 13. (a) Design a broaching fixture to perform broaching operation on sides of a square block of size 50 mm x 50 mm. Or
Page 1 of 20
V.SENTHIL ME
www.chennaituitions.in
(b) 14.
Describe the various classification of milling fixtures. Describe
(a) How are the dies classified according to their construction? the different types.
Or (b) Find the total pressure, dimensions of tools to produce a washer 50 mm outside diameter with a 24 mm hole, from material 4 mm thick, having a shear strength of 360 N/mm2. 15. (a) Design and draw a suitable die for