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Manufacturing > Casting > Flashcards

Casting Flashcards

1
Q

Bottom part of Casting mold?

A

Drag

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2
Q

Top part of casting mold?

A

Cope

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3
Q

Intermediate flask in three piece molding?

A

Cheek

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4
Q

what is Burnt sand?

A

Used and burnt sand.

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5
Q

Used for making hollow cavities in moulding.

A

Core

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6
Q

what is Pouring basin?

A

A small funnel‐shaped cavity at the top

of the mould into which the molten metal is poured.

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7
Q

what is sprue?

A

The passage through which the molten metal

from the pouring basin reaches the mould cavity.

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8
Q

what is runner?

A

The passage ways in the parting plane through
which molten metal flow is regulated before they reach
the mould cavity.

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9
Q

what is gate?

A

The actual entry point through which molten

metal enters the mould cavity in a controlled rate.

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10
Q

what is chaplet?

A

Chaplets are used to support cores inside the

mould cavity.

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11
Q

what is chill?

A

Chills are metallic objects, which are placed in

the mould to increase the cooling rate of castings.

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12
Q

what is riser?

A

It is a reservoir of molten metal provided in the
casting so that hot metal can flow back into the mould
cavity when there is a reduction in volume of metal due
to solidification

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13
Q

what is padding?

A

Tapering of thinner section towards thicker section

is known as ‘padding

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14
Q

why is padding required in moulding?

A

If padding is not provided, centre line shrinkage or

porosity will result in the thinner section.

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15
Q

The main purpose of chaplets is?

A

To support the cores.

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16
Q

methods are used for obtaining directional solidification for riser design?

A

padding and chills

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17
Q

Main function of a Gate in moulding?

A

To feed the metal at constant rate.

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18
Q

why is uniform ramming required for sand mouldings?

A

greater dimensional stability of the mould.

19
Q

Is green sand dry or wet?

A

wet

20
Q

What is done to account for liquid shrinkage?

A

Riser

21
Q

What is done to account for solidification shrinkage?

A

Riser

22
Q

What is done to account for solid shrinkage?

A

Shrinkage allowance

23
Q

which metal casting doesn’t need riser?

A

Grey cast iron

24
Q

Why does Grey cast iron doesn’t need shrinkage allowance?

A

it has negative shrinkage. ie it expands on cooling due to graphite precipitation.

25
Q

Cast Iron pattern allowance percentage?

A

10mm/m

26
Q

Brass pattern allowance percentage?

A

15mm/m

27
Q

aluminium pattern allowance percentage?

A

15mm/m

28
Q

Copper pattern allowance percentage?

A

15mm/m

29
Q

Steel pattern allowance percentage?

A

20mm/m

30
Q

Zinc pattern allowance percentage?

A

25mm/m

31
Q

Lead pattern allowance percentage?

A

25mm/m

32
Q

is internal allowance added or subtracted?

A

added

33
Q

why are drafts used in patterns?

A

For wasy removal of pattern from mould.

34
Q

Among inner and outer surface of patterns which require more draft?

A

Inner

35
Q

what is rapping of pattern?

A

At the time of pattern removal, the pattern is rapped all around the vertical faces to enlarge the mould cavity slightly to facilitates its removal

36
Q

what kind of allowance is given for rapping? neg or pos

A

negative

37
Q

which planes require rapping allowance?

A

planes parallel to parting line

38
Q

what is distortion allowance?

A

A metal when it has just solidified is very weak and therefore is likely to be distortion prone. The foundry practice should be to make extra material provision for reducing the distortion.

39
Q

Can mercury be used for pattern making?

A

Yes!

40
Q

can lead be used for pattern making?

A

NO!

41
Q

Disposable patterns aare made of?

A

Polystyrene

42
Q

What is gated patteren?

A

Gate and runners made integrally with the pattern.

43
Q

What is loose piece pattern?

A

When the pattern contour is not removable in single piece. Then the pattern is made of loose pieces.

44
Q

The pattern adopted for those castings where there are some portions which are structurally weak and are likely to break by the force of ramming are called:

A

follow board pattern

Manufacturing (1 decks)

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