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Test Paper - Metal Casting - Punjab Technical University - Production Engineering, Study notes of Production Engineering

<div><br /></div><div>moulding sand¸ fluidity of metals, risers, External chill, Internal chill, gating system dimensions, directional solidification process, vecuum moulding process, aluminium casting, casting process, contraction of the metal, skin effect, Rate of solidification, Factors on which the nucleation depends, Applications of shell moulding,Swelling of casting.</div><div><br /></div><div><br /></div><div><br /></div>

Typology: Study notes

2010/2011

Uploaded on 09/24/2011

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RollNo........................... 'i1
Total No. of Questions: 08] [Total No. of Page~: 02
... -
'\..
Paper ID [PESOl]
(Please fill this Paper ID in OMR Sheet)
1\1. Tech.
METAL CASTING (PREIPE -501)
Time: 03Hours
Instruction to Candidates:
Maximum Marks : 100
1)
2)
Attempt any Five Questions.
All questions carry equal, marks.
Ql) (a) Discuss the different ingredients of moulding sand. Also compare these
ingredients with the ingredients of core sands.
(b) Discuss in brief the influence of clay content and percentage of tempering
water on the strength of a moulding sand.
Q2) (a) Explain how nucleation occurs and grows in the freezing of the ptire
metal.
(b) List and discuss briefly the factor that affects the fluidity of metals.
Q3) (a) Define risers. What are its primary functions? Design the ingate
dimensions for pouring a 20 kg casting in 11 sec, with the runner
having a cross.-section area -of 600 sq.-mm and the two ingates of 25
mm width each. (Assume any missing data).
(b) What.arethe different types of gates? What are the different objectives
that a designed gating system must accomplish?
Q4) (a) Discuss:
(i) External chill. (ii) Internal chill.
'The use of internal" chill. is more" suitable than external one'. Explain.
(b) Discuss all the formulas used to calculate the gating system dimensions.
(c) Give a short review about the directional so1idification process. Discuss
how the directional solidification can be controlled.
pf2

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Roll No........................... 'i Total No. of Questions: 08] (^) [Total No. of Page~: 02'..... -

Paper ID [PESOl]

(Please fill this Paper ID in OMR Sheet) 1\1. Tech. METAL CASTING (PREIPE - 501)

Time: 03 Hours

Instruction to Candidates:

Maximum Marks : 100

Attempt any Five Questions. All questions carry equal, marks.

Ql) (a) Discuss the different ingredients of moulding sand. Also compare these ingredients with the ingredients of core sands. (b) Discuss in brief the influence of clay content and percentage of tempering water on the strength of a moulding sand.

Q2) (a) Explain how nucleation occurs and grows in the freezing of the ptire metal. (b) List and discuss briefly the factor that affects the fluidity of metals.

Q3) (a) Define risers. What are its primary functions? Design the ingate

dimensions for pouring a 20 kg casting in 11 sec, with the runner

having a cross.-section area -of 600 sq.-mm and the two ingates of 25

mm width each. (Assume any missing data).

(b) What .are the different types of gates? What are the different objectives

that a designed gating system must accomplish?

Q4) (a) Discuss: (i) External chill. (ii) Internal chill. 'The use of internal" chill. is more" suitable than external one'. Explain. (b) Discuss all the formulas used to calculate the gating system dimensions. (c) Give a short review about the directional so1idification process. Discuss how the directional solidification can be controlled.

QS) (a) Discuss the vecuum moulding process. ~(b ) Compare die casting and full mould process from the point of process,

product and applications..

(c) Why is aluminium casting preferred to be done by cold chamber than

hot chamber die casting?

; Q6) (a) What are the different suitable casting prc,:>cessesused for brass metals, justify your answer..

(b) Explain why certain metals are added in aluminium during casting

process.

(c) What are the different properties of aluminium that make it suitable for

its use in casting?

Q7) (a) The metal contracts in volume as it cool in the mould. Discuss the

. stages in which the contraction of the metal takes place.

(b) Discuss the mechanism of skin effect when a pure metal is allowed to

freeze.

Q8) Write short note on the following:

(a) Rate of solidification.

(b) Factors on which the nucleation depends.

(c) Applications of shell moulding.

(d) Swelling of casting.