Chapter 5 Flashcards Preview

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Flashcards in Chapter 5 Deck (13):
1

Capabilities and Advantages of Casting (4)

Complex geometric shapes
External and internal shapes
Very large parts
Mass production

2

Disadvantages of Casting (4)

Limitation on mech properties
Poor dimensional accuracy
safety hazard
environmental problems

3

Name of factory equipped to make molds

foundry

4

Name parts of mold. Main parts.

Pouring cup, downsprue, runner, riser then cavity.

Parting line separates Cope and drag

5

Name expendable mold materials

Sand, plaster

6

Permanent or expendable $$$

Permanent are more economic in high production operations

7

Upper half of mold

Cope

8

What factors determine success in molds (3)

Pouring rate
Pouring temperature
Turbulence

9

How does a pure metal solidify

Constant temp equal to its melting point.
Grains are randomly oriented at walls and then upside down Y toward the center

10

How does an alloy solidify

Freeze over a temperature range.
Small grains at walls and center. Then grains create upside down Y with small grains in the middle.

11

Chvorinov's Rule

Tts = Cm(V/A)^n=2
Total solidification time is equal to the mold constant * Volume of casting / surface area of casting to the 2.

12

Mold constant depends on

Mold material
Thermal properties of casting metal
Pouring temp relative to melting temp

13

Exception to shrinkage

Cast iron with High C content.