Download GTU BE/B.Tech 2019 Summer 8th Sem New 21823072182311 Advanced Plastic Mould Design Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019

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Subject Code:2182307/2182311 Date:17/05/2019
Subject Name:Advanced Plastic Mould Design
Time:10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

Q.1 (a) What is clamping pressure and how clamping pressure is determined? 03
(b) What are the factors that affect economical mould cooling? 04

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(c) A plastic component having 1. Shrinkage: 0.2-1.1% 2. Volume of 07
component: 18.037 cm³ 3.Density of material: 1.39 g/cm³ 4.Weight of the
component: 23.27 g 5. Number of cavities: Single cavity 6.Projected area of
component: 101.28 cm² 7. Injection pressure — 1000kg/cm²
Material: PA 66 With 33% GF

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Calculate
1. Shot capacity required? (swept volume of the injection cylinder = 67.9 cm³)
2. Clamping tonnage required(Factor of safety =1.3 & Cavity pressure is 2 of injection pressure)

Q.2 (a) Write a short note on different types of cooling channels 03
(b) Explain the concept of spring actuation-system in split mould with appropriate diagram 04

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(c) Explain collapsible core with neat sketch 07
OR
(c) Explain cam track actuation system with neat sketch 07

Q.3 (a) What are the types of gates and ejection systems can be incorporated in two plate moulds only. 03
(b) Name different types of ejection systems used in injection molding industry 04

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(c) Explain rotating core mechanism with neat sketch. 07
OR
Q.3 (a) What is the importance of tolerance in injection moulds? 03
(b) What is shrinkage and explain how it can be compensated. 04
(c) Explain dog-leg cam and its terminology with neat sketch 07

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Q.4 (a) Explain heat pipe cooling with neat sketch 03
(b) Explain stripper plate ejection system with neat sketch 04
(c) Explain finger cam mechanism with its detailing with neat sketch 07
OR
Q.4 (a) Write a short note on undercuts. 03

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(b) What are the parameters requires for the selection of injection molding machine 04
(c) Explain 2-plate injection mould and its details with neat sketch 07

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Q.5 (a) What is 1.side core 2. Back pressure 3.Register Ring 03

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(b) How auto de-gating can be achieved. 04
(c) Explain the concept of axially fixed rotating core and withdrawing of rotating core. 07
OR
Q.5 (a) What are advantages of CAD in Plastics mould design? 03
(b) Write C-Program for calculating short-Capacity 04

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(c) Explain the working principle of angled pin lift splits 07

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