GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019
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Subject Code: 2172108 Date: 16/05/2019Subject Name: Metal Working Processes
Time: 02:30 PM TO 05:00 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) What is warm working? Give its advantages. 03
(b) What is angle of bite? Relate angle of bite to coefficient of friction. 04
(c) With causes and remedies discuss different rolling defects. 07
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Q.2 (a) With neat sketch show engineering and true stress strain diagram. 03
(b) What is flash in forging? Briefly explain its role and function. 04
(c) What are different extrusion processes? With neat sketch brief them. 07
OR
(c) Classify metal working processes and briefly explain them. 07
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Q.3 (a) What is FEM? Can FEM be used to simulate metal forming? 03
(b) What are different die materials and role of lubricant in metal forming? 04
(c) Compare close die and open die forging. 07
OR
Q.3 (a) What is extrusion ratio? Explain. 03
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(b) What are different forging operations? With neat sketch show them. 04
(c) What are different rolling variables? Explain them. 07
Q.4 (a) What property material should possess for wire drawing? With sketch show wire drawing operation. 03
(b) What is embossing and coining? Explain briefly. 04
(c) Discuss shearing and deep drawing processes in sheet metal working. 07
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OR
Q.4 (a) What are different forging defects? For any one give causes and remedies. 03
(b) Briefly discuss defects in extrusion. 04
(c) Derive equation for extrusion pressure. 07
Q.5 (a) Derive geometric relation for length of arc of contact (Lp) in rolling. 03
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(b) What are variables of wire drawing? Explain briefly. 04
(c) What are different possible defects in wire drawing operation? Provide possible causes and remedies. 07
OR
Q.5 (a) What is neutral point and roll flattening? 03
(b) What is extrusion ratio and process variables in extrusion. 04
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(c) Discuss possible rolling defects with their causes and remedies. 07
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