GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
Subject Code: 2173409
Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020
Subject Name: Plastic mold & Die design
Time: 10:30 AM TO 12:30 PM
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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- Q.1 (a) What are the machines used for fabrication of molds. [03]
(b) What are the design considerations and constraints for split mould? [04]
(c) What are parts of Conventional Injection Mold and Suggest best materials to Manufacture them with neat sketch [07] - Q.2 (a) What is Honing Operation? [03]
(b) What is Shrinkage and how it can be calculated? What is warpage? [04]
(c) Explain the Working principle of EDM-wire cut machine with neat sketch [07] - Q.3 (a) What are the parts of Extruder screw and their functions [03]
(b) For a 8 — cavity Mould explain the concept of Runner and Gate Balancing [04]--- Content provided by FirstRanker.com ---
(c) What is Transfer Molding? Explain the Design principles of Pot and Plunger transfer mold with appropriate sketches. [07] - Q.4 (a) What is Transfer Pot and Loading chamber? [03]
(b) Explain the working principle of Form Pin. [04]
(c) What is Extrusion? What are the die Design Goals-of Extrusion Die and suggest the ways to accomplish the same. [07] - Q.5 (a) What is Gate? What are the factors that required selecting the optimum size of Gate? [03]
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(b) What is Bolster? Name the types of Bolsters available and what are the materials used for construction of bolsters: [04]
(c) Explain the working Principle of Finger cam actuation mechanism with neat sketch and necessary calculations [07] - Q.6 (a) What is Runner efficiency and how it is calculated? [03]
(b) What is Sprue? Write a short Note on Sprue Design and Its types with appropriate sketches [04]
(c) What is Runner? How many Types of Runners were there with neat sketches? How runner size and layout is calculated? Suggest the best runner. [07] - Q.7 (a) Explain Transfer Molding Cycle with neat sketch. [03]
(b) Explain Flash Type compression mold with neat sketch. [04]
(c) Explain Different types of Gates with neat sketches? Explain how Auto-Degating can be achieved? [07] - Q.8 (a) What are the fundamentals to be considered in designing Transfer Molds? [03]
(b) Explain how Integer Core and cavity cooling can be achieved with neat diagram. [04]--- Content provided by FirstRanker.com ---
(c) What is Parting surface? Explain How parting surfaces are classified. [07]
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Date: 28/01/2021
Total Marks: 56
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