Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 7th Sem New 2172302 Plastics Mold And Die Design Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VII (New) EXAMINATION ? WINTER 2019
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:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define : Insert , Bolster , Guide pin 03
(b) Discuss the requirements of a gate 04
(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:
1. Material of Bolster is (a) MS (b) EN-24 (c) EN-8 (d) EN 48B (e)
none of these
2. 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.
3. Shaping operation removes metal in (a) Millimeters
(b) Cms Microns (d) None of these
4. For removal of metal burrs from the holes , the operation done is
[a] grinding [b] honing [c] reaming [d] polishing
5. 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.
6. Sleeve ejection is preferred for (a) short hollow products (b) tall
hollow products (c) solid tall products (d) solid short products.
7. 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.
07
OR
(c) Draw the hand injection mould for product shown in fig.[a]. Use
Graph paper.
07
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:
Bulk factor of PS = 1.9
Bulk factor of ABS = 1.8
Specific gravity of PS = 1.04
Specific gravity of ABS= 1.0
04
(c) Discuss Sleeve Ejection in Detail. 07
OR
Q.3 (a) Discuss the importance of approach section in a Die 03
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VII (New) EXAMINATION ? WINTER 2019
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:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define : Insert , Bolster , Guide pin 03
(b) Discuss the requirements of a gate 04
(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:
1. Material of Bolster is (a) MS (b) EN-24 (c) EN-8 (d) EN 48B (e)
none of these
2. 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.
3. Shaping operation removes metal in (a) Millimeters
(b) Cms Microns (d) None of these
4. For removal of metal burrs from the holes , the operation done is
[a] grinding [b] honing [c] reaming [d] polishing
5. 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.
6. Sleeve ejection is preferred for (a) short hollow products (b) tall
hollow products (c) solid tall products (d) solid short products.
7. 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.
07
OR
(c) Draw the hand injection mould for product shown in fig.[a]. Use
Graph paper.
07
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:
Bulk factor of PS = 1.9
Bulk factor of ABS = 1.8
Specific gravity of PS = 1.04
Specific gravity of ABS= 1.0
04
(c) Discuss Sleeve Ejection in Detail. 07
OR
Q.3 (a) Discuss the importance of approach section in a Die 03
2
(b) Discuss about Design of Film Die. 04
(c) Discuss advantages, disadvantages and applications of Pin Gate;
Submarine Gate ; Overlap gate ; rectangular edge gate; tab gate ; ring
gate and diaphragm gate.
07
Q.4 (a) For the product shown in fig[b], discuss the gate that is most suitable.
Justify.
03
(b) What is the manufacturing process of Guide Pin.? Discuss 04
(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
07
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
shown in fig.[a].
Given Data : Bulk factor of PS = 1.4
Bulk factor of PP = 1.9
Specific gravity of PS= 1.04
Specific gravity of PP = 0.9
04
(c) Write the function of : Lathe ; Shaping machine ; Drilling machine ;
Grinding machine ; wire EDM ; milling machine ; honing machine.
07
Q.5 (a) What is WIRE EDM? 03
(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:
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.
04
(c) A product in HDPE weighing 5 gms is to be molded on an injection
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
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VII (New) EXAMINATION ? WINTER 2019
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:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define : Insert , Bolster , Guide pin 03
(b) Discuss the requirements of a gate 04
(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:
1. Material of Bolster is (a) MS (b) EN-24 (c) EN-8 (d) EN 48B (e)
none of these
2. 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.
3. Shaping operation removes metal in (a) Millimeters
(b) Cms Microns (d) None of these
4. For removal of metal burrs from the holes , the operation done is
[a] grinding [b] honing [c] reaming [d] polishing
5. 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.
6. Sleeve ejection is preferred for (a) short hollow products (b) tall
hollow products (c) solid tall products (d) solid short products.
7. 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.
07
OR
(c) Draw the hand injection mould for product shown in fig.[a]. Use
Graph paper.
07
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:
Bulk factor of PS = 1.9
Bulk factor of ABS = 1.8
Specific gravity of PS = 1.04
Specific gravity of ABS= 1.0
04
(c) Discuss Sleeve Ejection in Detail. 07
OR
Q.3 (a) Discuss the importance of approach section in a Die 03
2
(b) Discuss about Design of Film Die. 04
(c) Discuss advantages, disadvantages and applications of Pin Gate;
Submarine Gate ; Overlap gate ; rectangular edge gate; tab gate ; ring
gate and diaphragm gate.
07
Q.4 (a) For the product shown in fig[b], discuss the gate that is most suitable.
Justify.
03
(b) What is the manufacturing process of Guide Pin.? Discuss 04
(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
07
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
shown in fig.[a].
Given Data : Bulk factor of PS = 1.4
Bulk factor of PP = 1.9
Specific gravity of PS= 1.04
Specific gravity of PP = 0.9
04
(c) Write the function of : Lathe ; Shaping machine ; Drilling machine ;
Grinding machine ; wire EDM ; milling machine ; honing machine.
07
Q.5 (a) What is WIRE EDM? 03
(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:
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.
04
(c) A product in HDPE weighing 5 gms is to be molded on an injection
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
07
3
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This post was last modified on 20 February 2020