GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
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Subject Code: 2172302 Date: 23/11/2019
Subject Name: Plastics Mold & Die Design
Time: 10:30 AM TO 01:30 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
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 03 hexagonal runner
(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 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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OR
(c) Draw the hand injection mould for product shown in fig.[a]. Use 07 Graph paper.
Q.3 (a) Draw a Pipe Die and explain its parts 03
(b) Calculate the shot capacity of the injection moulding machine if a 04 product of weight 15 gms is to be moulded in ABS and a 16 impression mould is desired. Assume:
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Bulk factor of PS=1.9
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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OR
Q.3 (a) Discuss the importance of approach section in a Die 03
(c) Discuss advantages, disadvantages and applications of Pin Gate; 07 Submarine Gate ; Overlap gate ; rectangular edge gate; tab gate ; ring gate and diaphragm gate.
Q.4 (a) For the product shown in fig[b], discuss the gate that is most suitable. 03 Justify.
(b) What is the manufacturing process of Guide Pin.? Discuss 04
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(c) A rectangular box molded in PP has dimensions of 185x125x40mm. 07 Top open, this box has wall thickness of 2mm throughout. If a 2 impression mould is desired , do the feed system calculations
OR
Q.4 (a) Rectangular Edge Gate cannot be used for PVC. Why? 03
(b) Calculate the shot capacity of injection machine for the product 04 shown in fig.[a].
Given Data : Bulk factor of PS = 1.4
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Bulk factor of PP =1.9
Specific gravity of PS=1.04
Specific gravity of PP = 0.9
(c) Write the function of : Lathe ; Shaping machine ; Drilling machine ; 07 Grinding machine ; wire EDM ; milling machine ; honing machine.
Q.5 (a) Whatis WIRE EDM? 03
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(b) Draw a Monofilament die and discuss its parts 04
(c) Discuss Pin Ejection in Detail 07
OR
Q.5 (a) What is the role of a push back pin? Discuss. 03
(b) Fill in the blanks: 04
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- Material of ejector rod is
- For hollow products , gate is used.
- Rectangular edge gate cannot be used for materials.
- is the disadvantage of a pin gate.
(c) A product in HDPE weighing 5 gms is to be molded on an injection 07 moulding machine having shot capacity of 250 gms. Work out how many impressions can be'moulded on this machine .Assume bulk factor of HDPE = 1.8 ;(Specific gravity of HDPE = 0.96. Bulk factor of PS=1,4; sp.gr.of PS=1.04
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