GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018
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Subject Code: 2172302 Date: 15/11/2018Subject 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 : Mould ; Insert ; Guide pin 03
(b) Fill in the blanks: 04
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- Material of guide pin is __________
- Rectangular edge gate cannot be used for __________
- Minimum diameter of a runner is __________
- Ring gate is used for __________
(c) For the product shown in fig[a], design a hand injection mould . Show 07
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all calculationsQ.2 (a) Discuss the importance of Lathe machine in a plastics mould making 03
shop.
(b) For the product shown in fig[b], write down step by step machining 04
(c) For the mould designed above, draw both plan and elevation in graph 07
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paper.OR
(c) Discuss Pin Ejection in detail 07
Q.3 (a) For the product shown in fig[c],suggest and design suitable gate 03
(b) Calculate the efficiency of full round, half round, trapezoidal and 04
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hexagonal runners.(c) The shot capacity of an Injection moulding machine is 300 gms. It is 07
desired to mould the product-shown in fig.[a] on this machine. Work
out the no.of impressions-that can be moulded on this machine.
Bulk factor of PS =1.4
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Bulk factor of PP=1.9Specific gravity of PS=1.04
Specific gravity of PP = 0.9
OR
Q.3 (a) Classify Extrusion Dies 03
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(b) Discuss the requirements of Runner and Gate 04
(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) Discuss the functions of grinding machine in Mould making shops 03
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(b) Discuss difference between integer and insert bolster type of moulds. 04
(c) Calculate the shot capacity of the injection moulding machine if a 07
product of weight 25 gms is to be moulded in ABS and a 10
impression mould is desired. Assume:
Bulk factor of PS=1.9
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Bulk factor of ABS =1.8Specific gravity of PS = 1.04
Specific gravity of ABS=1.0
Q.4 (a) Write about functions of Milling machine 03
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(b) Differentiate between shaping and planning. 04
(c) A rectangular box molded in LDPE has dimensions of 07
185x125x40mm. Top open, this box has wall thickness of 2mm
throughout. If a 2 impression mould is desired , do the feed system
calculations
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Q.5 (a) Discuss applications of ring gate 03
(b) Discuss about submarine gates. 04
(c) Tick the correct answer: 07
- Material of bolster is [a] EN-8 [b] M.S. [c] OHNS
- Material of guide pin is [a] M.S. [b] EN-24 [ c] EN-8 [d] OHNS
- For PVC, Gate preferred in multi impression moulds is [ a] Ring gate [b] Rectangular edge gate [c] Round Edge gate [d] Fan Gate
- 4. Function of Shaping machine is [a] make holes in plate [b] make concave shapes [c] level the plate from all sides [d] facing
- Pin gate is used for [a] multi impression moulds [ b] PVC materials [c] tall hollow products [d] none of these
- Sleeve ejection is used for [a] solid products [b] hollow products [c] long products [d] products with intricate shapes
- For polishing of big holes process used is [a] reaming [b] honing[c]grinding[d]none of these
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OR
Q.5 (a) Write about EDM 03
(b) Discuss stripper plate ejection 04
(c) A product in HDPE weighing 5 gms is to.be molded on an injection 07
moulding machine having shot capacityof 150 gms. Work out how
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many impressions can be moulded on this machine .Assume bulkfactor 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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