Subject Code:2172302
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020
Subject Name:Plastics Mold & Die Design
Time:10:30 AM TO 12:30 PM
Instructions:
- Attempt any THREE questions from Q.1 to Q.6 .
- Q.7 is compulsory.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define : Insert , Bolster , Guide pin 03
(b) Discuss the requirements of a gate 04
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(c) Design a Hand Injection mould for the product shown in fig [a] 07
Q.2 (a) Calculate efficiency of round runner , trapezoidal runner and hexagonal runner 03
(b) Differentiate between integer and insert type of mould 04
(c) Tick the correct one: 07
- Material of Bolster is (a) MS (b) EN-24 (c) EN-8 (d) EN 48B (e) none of these
- Function of push back pin is [a] To eject the product. [b] to protect the core/cavity while mould opening.[c] to protect the core/cavity while mould closing [d] none of these.
- Shaping operation removes metal in (a) Millimeters (b) Cms (c) Microns (d) None of these
- For removal of metal burrs from the holes , the operation done is [a] grinding [b] honing [c] reaming [d] polishing
- Gate has a minimum cross sectional area due to : (a) To increase pressure drop (b) to offer resistance so that impression fills completely.(c) to decrease pressure drop (d) none of these.
- Sleeve ejection is preferred for (a) short hollow products (b) tall hollow products (c) solid tall products (d) solid short products.
- Function of Ejector retainer plate is (a) to hold the ejector element (b) to hold the ejector plate (c) to protect the ejector plate (d) none of these.
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Q.3 (a) Draw a Pipe Die and explain its parts 03
(b) Calculate the shot capacity of the injection moulding machine if a product of weight 15 gms is to be moulded in ABS and a 16 impression mould is desired. Assume: 04
Bulk factor of PS=1.9
Bulk factor of ABS=1.8
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Specific gravity of PS = 1.04
Specific gravity of ABS=1.0
(c) Discuss Sleeve Ejection in Detail. 07
Q.4 (a) Discuss the importance of approach section in a Die 03
(b) Discuss about Design of Film Die. 04
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(c) Discuss advantages, disadvantages and applications of Pin Gate; Submarine Gate ; Overlap gate ; rectangular edge gate; tab gate ; ring gate and diaphragm gate. 07
Date:19/01/2021 Total Marks: 47
Q.6 (a) Justify. 04
(b) What is the manufacturing process of Guide Pin.? Discuss 07
(c) A rectangular box molded in PP has dimensions of 185x125x40mm. Top open, this box has wall thickness of 2mm throughout. If a 2 impression mould is desired , do the feed system calculations 03
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(a) Rectangular Edge Gate cannot be used for PVC. Why? 04
(b) Calculate the shot capacity of injection machine for the product shown in fig.[a]. 07
Given Data : Bulk factor of PS = 1.4
Bulk factor of PP =1.9
Specific gravity of PS=1.04
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Specific gravity of PP = 0.9
Q.7 Write the function of : Lathe ; Shaping machine ; Drilling machine ; Grinding machine ; wire EDM ; milling machine ; honing machine. 05
Q.7 Draw a Monofilament die and discuss its parts 05
OR
Fill in the blanks:
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a. Material of ejector rod is __________
b. For hollow products , __________ gate is used.
c. Rectangular edge gate cannot be used for __________ materials.
d. __________ is the disadvantage of a pin gate.
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