Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3152309 Plastic Mold And Die Design Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3152309 Date:03/02/2021
Subject Name:Plastic Mold & Die Design
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use Grpah paper for drawing of mould
MARKS
Q.1
(a) Define : Mould ; Insert ; Guide pin
03
(b) Fill in the blanks:
04
1. Material of Insert is _____________
2. Material of Guide pin is _____________
3. Function of ejector pin is ______________
4. For hollow products , _________ejection is used.
(c) For the figure shown in fig[a], design a single impression injection
07
mould. Show calculations for feed system in detail.
Q.2
(a) Draw cooling channels for Integer Core cooling
03
(b) Discuss functions of Lathe, Milling, Shaping, Grinding Machines.
04
(c) For the mould designed in Q1[c] , draw both plan and sectional
07
elevation of the mould.
Q.3
(a) Discuss Integer v/s. Insert bolster moulds.
03
(b) Discuss integer cavity cooling
04
(c) Discuss in detail about Heat Rods
07
Q.4
(a) Discuss about Rectangular edge gate and fan gate.
03
(b) Show cooling of Shallow Cores
04
(c) Discuss helical channel Cooling for deep cores
07
Q.5
(a) Discuss about gates that can be used for hollow mouldings. Give
03
advantages and disadvantages.
(b) Determine the pitch and the pitch circle diameter for the
04
interconnecting groove design , given the following information:
Diameter of insert : 30mm ; Gap between inlet and outlet grooves :
4.5mm ; number of impressions : 12 ; depth of groove : 5mm.
(c) Discuss Stripper plate Ejection in detail
07
Q.6
(a) Discuss about Sprue pullers
03
(b) Tick the correct one:
04
1. Shaping operation removes metal in [a] cm [b] mm [c] micron
[d] meter
2. For solid rectangular mouldings , owe use ______gate.
[a] Fan [b] Film [c] Tab [d] edge
3. Wire EDM is used for
[a] cutting complex contours [b] gear cutting [c]
1
making grooves [d] making thin intricate shapes
in mould plates
4.For materials with high melt viscosity , runner and gate
dimensions are
[a] increased by 20% [b] increased by 25% [c] decreased by
20% [d] decreased by 25%
(c) What are collapsible cores? Discuss
07
Q.7
(a) Design a rectangular edge gate for a PE box whose dimensions are : length =
03
130 mm ; width = 80mm ; depth = 30mm; wall thickness = 2 mm. take n =
0.6
(b) Calculate the shot capacity of the injection moulding machine if a
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product of weight 40 gms is to be moulded in ABS and a 16 impression
mould is desired. Assume:
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 Pin Ejection
07
Q.8
(a) Discuss requirements of gates
03
(b) Discuss actuating methods of Stripper plates.
04
(c) Calculate runner efficiency for Fully Round, Half Round, Trapezoidal,
07
Modified trapezoidal, hexagonal , rectangular and square gates
2
This post was last modified on 04 March 2021