Download GTU BE/B.Tech 2019 Summer 8th Sem New 2183602 Design And Fabrication Of Molds Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019
Subject Code:2183602 Date:09/05/2019
Subject Name:Design & Fabrication Of Molds
Time:10:30 AM TO 01:00 PM Total Marks: 70

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

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Q.1 (a) Explain following terms: (1) Parting lines (2) Ribs (3) Bosses 03
(b) Explain about different types of undercuts in moulded plastic parts. 04
(c) What are the different modifications to be done in nominal wall to improve 07
its structural response?

Q.2 (a) Suggest the appropriate location of heater in compression molding. 03

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(b) Explain Approach section and land in extrusion process with figure. 04
(c) Explain in detail about Hot runner moulds and cold runner moulds. 07
OR
(c) Write about the basic heating systems for plates & Molds. 07

Q.3 (a) Explain die design procedure steps. 03

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(b) Why a small gate is desirable for any plastic product to be produce? 04
(c) Explain different types of gates used in polymer industries. 07
OR
Q.3 (a) How to calculate loading chamber depth in compression molding. 03
(b) Explain in detail about semipositive vertical flash type of compression 04

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molding.
(c) Explain the tubing die with a neat sketch. 07

Q.4 (a) What do you mean by die swell? Explain the various factors that influence 03
by die swell.
(b) Explain the design of pot transfer mould with neat sketch. 04

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(c) How to calculate number of cavities in Transfer moulds? Explain. 07
OR
Q.4 (a) What do you mean by venting? Suggest various location of vent. 03
(b) What are the different factor that influence thermoset molding? 04
(c) Explain the following parts of Injection moulds with figure. (1) Fixed 07

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Clamping Plate (2) Runner Stripper Plate (3) Cavity Plate (4) Ejector
Retainer Plate

Q.5 (a) Give classification of Extrusion dies. 03
(b) What are the different types of heat losses occurred in compression mould? 04
Explain it with formula.

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(c) What do you mean by Plasticising capacity? How to calculate number of 07
impression by plasticising capacity.
OR
Q.5 (a) Explain various types of runner design in transfer molding. 03
(b) What are the selection criteria of a mould material? 04

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(c) Define CAD. Explain the steps involved in CAD process. What are the 07
benefits of implementing CAD?

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