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MEC130 > Lecture 2 - Disposable Mould Casting > Flashcards

Lecture 2 - Disposable Mould Casting Flashcards

1
Q

Parting line

A

Interface that separates cope and drag

Release

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2
Q

Cope

A

Top part of mould

Shape

Hint: cope = covering

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3
Q

Drag

A

Bottom part of mould

Shape

Hint: drag = frame, thing that is dragged

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4
Q

Flask

A

Rigid metal/wood frame that holds entire moulding assembly

Shape

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5
Q

Pouring cup

A

Entrance for molten material

Shape

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6
Q

Sprue

A

Channel used to deliver molten material

Shape

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7
Q

Gating system

A

Channel used to deliver molten material to mould cavity

Quality

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8
Q

Riser

A

Extra void (which is part of gating system) created to be filled with molten material

Quality

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9
Q

Core

A

Sand or metal shape used to produce internal feature of a casting

Shape

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10
Q

Core print

A

Area used to locate and support core within a mould

Shape

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11
Q

Mould cavity

A

Space to be filled with molten material

Shape

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12
Q

Draft

A

Taper on casting that permits casting to be withdrawn from mould

Release

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13
Q

Pattern

A

Replica of object tonne cast. Used to form mould cavity

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14
Q

Criteria to consider when producing a mould

A 
Weight of component
Effect of pouring (corrosion)
Temperature of molten metal
Clean removal of cast from mould
Trapped gases
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15
Q

Sand casting advantages

A

Low cost
Almost all engineering metals and polymers can be cast
No limit to max. weight and thickness
Able to produce complex shapes

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16
Q

Disadvantages to sand casting

A

High porosity
Rough surface finish
Low dimensional accuracy

17
Q

Advantages to investment casting

A 
Excellent surface finish
High dimensional accuracy
Almost unlimited intricacy
Most metals can be cast
No flash or parting line concerns
18
Q

Disadvantages to investment casting

A

Costly pattern and moulds
High labour costs
Time-consuming

MEC130 (6 decks)

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