Download GTU BE/B.Tech 2018 Winter 7th Sem New 2173409 Plastic Mold And Die Design Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018

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Subject Code: 2173409 Date: 03/12/2018
Subject Name: Plastic mold & Die 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 the role of CNC Machines in mould fabrication 03
(b) What are the principles of mould design? 04

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(c) What are the different types of materials used for different parts of the mould? 07

Q.2 (a) Why heat treatment of mould is necessary? Name 3 Heat treatment techniques. 03
(b) Explain compression molding cycle with neat sketch 04
(c) Explain the working principle of CNC-Lathe machine. How many working axis does a lathe machine possess. 07

OR

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(c) Explain three plate mould with neat sketch 07

Q.3 (a) How mould heating can be achieved? 03
(b) Explain sub-marine gate. 04
(c) Explain pin-ejection system with neat sketch 07

OR

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Q.3 (a) Explain a. Ejector plate b. Retainer Plate c. Push back pin 03
(b) Differentiate injection molding Vs Compression molding 04
(c) Explain Dog-leg cam actuation system with neat sketch. 07

Q.4 (a) Explain Mould cooling? 03
(b) What are the requirements of Runner? 04

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(c) Explain different types of runners and their efficiencies with neat sketches. 07

OR

Q.4 (a) Explain pin-point & Tab gate with neat sketch 03
(b) Explain blade-ejection system with neat sketch. 04
(c) What is plastic extrusion? Explain the extrusion die construction principles. 07

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Q.5 (a) Explain integer & Insert type of moulds. 03
(b) Explain stripper & Valve ejection system with neat sketches. 04
(c) Explain positive & Semi positive type of compression moulds with neat sketches 07

OR

Q.5 (a) Name the process parameters of transfer mould. 03

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(b) What is gate? Why gate positioning is important? 04
(c) Explain pot & plunger type of transfer mould with neat sketch. 07