GTU BE 8th Semester 2183602 Design and Fabrication of Molds Summer 2018 Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE ? SEMESTER VIII (NEW SYLLABUS) EXAMINATION- SUMMER- 2017
Subject Code: 2183602 Date:30-04-2018
Subject Name: Design & Fabrication of Molds
Time: 10:30 AM to 01:00 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: core, gate, ejection. 03
(b) What are the elements of compression mold? Support your answer with neat
sketch.
04
(c) Prepare neat labelled cross-sectional view of RPVC Pipe Die. Write the functions
of various parts.
07

Q.2 (a) Write the types of compression molds. 03
(b) Write down the steps of transfer molding. Write its advantages. 04
(c) Explain the method of finding loading chamber depth of compression mold with a
product example.
07
OR
(c) Explain direct mold clamping for injection mold in detail. Write its advantages. 07

Q.3 (a) What is sprue? Mention its location in the mold. 03
(b) Write in brief about locating ring with neat sketch. Write its importance. 04
(c) Explain ejector plate assembly in detail with neat figure. 07
OR
Q.3 (a) What is the function of guide pin? Mention its location in the mold. 03
(b) Explain in brief about Tapered location with neat sketch. 04
(c) Explain guiding and supporting ejector plate assembly in detail with neat figure. 07

Q.4 (a) For which type of product, ?Ring gate? is used? Support your answer with sketch. 03
(b) Explain integer cavity plate cooling with neat sketch. 04
(c) Explain stripper plate ejection in detail with neat figure. 07
OR
Q.4 (a) Write the type of runners. Support your answer with sketch. 03
(b) Explain core insert cooling with neat sketch. 04
(c) Explain sleeve ejection in detail with neat figure. 07

Q.5 (a) Define: Three plate mold. Prepare sketch to support your answer. 03
(b) Explain annealing of mold parts in brief. Write its advantages. 04
(c) Explain Electric Discharge Machining in detail. Write its advantages and
limitations.
07
OR
Q.5 (a) Write the meaning of G00, G21, G81, M02, M08 and M19 in CNC programming. 03
(b) Explain Nitriding in brief. Write its advantages. 04
(c) Explain working of wire cut EDM machine in detail. Write its advantages and
limitations.
07
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