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Seat No.:
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Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-IV (NEW) EXAMINATION - WINTER 2020
Subject Code: 3142308 Date:11/02/2021
Subject Name: Fundamentals of Mold Design
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Time:02:30 PM TO 04:30 PM Total Marks:56
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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MARKS
Q.1 (a) Define: Core, Register Ring, Cavity 03
(b) Define: Sprue Bush, Runner and Gate, Guide Bush, Guide Pillars 04
(c) Explain about Integer cavity and Integer core plates with neat sketch. 07
Q.2 (a) Explain in brief about Inserts 03
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(b) Comparison between Ejector & Retaining Plate. 04
(c) Explain about shape and type of Inserts with neat sketch. 07
Q.3 (a) Define Parting surface of mold. List out various types of Parting surface. 03
(b) Explain in brief about Locating Ring 04
(c) Sketch any four types of Guide pins used in Mold design. 07
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Q.4 (a) List types of Bolster Plate. 03
(b) List out various types of Ejector system. State importance of cooling in mold design. 04
(c) Explain about Sprue Puller in-detail. 07
Q.5 (a) Choose any product produced in Hand Injection Molding machine. 03 Draw plan & sectional Elevation of the selected product.
(b) Draw sectional Elevation of Hand Injection mold for above selected product. 04
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(c) Draw plan & Inverted Plan of Hand Injection mold for above selected product. 07
Q.6 (a) For a Rectangular product of Polyacetal having length 100mm, width 50mm and height 25mm, wall thickness 2mm throughout. Calculate the dimensions of rectangular edge gate. 03
(b) Calculate the shot capacity of an injection molding machine if a product weight 20 gms is to be moulded in ABS and a 8 impression mold is desired. 04
Assume:
Bulk factor of PS=1.9
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Bulk factor of ABS=1.8
Specific gravity of PS=1.04
Specific gravity of ABS=1.0
(c) Discuss Sleeve Ejection in detail. 07
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Q.7 (a) List types of Runner. 03
(b) List the factors govern the size of Runner. 04
(c) Explain about Runner balancing with different examples and neat sketch. 07
Q.8 (a) List types of Gate used in Mold Design. 03
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(b) Discuss the application of any four Gate. 04
(c) Explain about Film Gate in detail with neat sketch. 07
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