Exam 1 Chapter 10

Question 1

Casting Process steps

Answer 1

1) Melt the Metal
2) Pour Metal into a mold
3) Let it cool and solidify

Question 2

Expandable Mold vs Permanent Mold

Answer 2

1) Must be destroyed to remove (can’t be reused) EX: Sand Casting (common for cast iron molding)
2) Can be used to produce many castings

Question 3

Factors that determine pouring sucess

Answer 3

1) Pouring Temperature
2) Pouring Rate
3) Turbulence

Question 4

Shrinkage Allowance

Answer 4

amount which mold is made larger relative to the final casting size

Question 5

Sandcasting

Answer 5

-Expandable mold casting
-most widely used casting method
-Almost all metal and alloys can be sand casted

Question 6

Types of Patterns

Answer 6

(a) Solid
(b) Match-plate
(c) Split

Question 7

Types of Sand Molds

Answer 7

1) Green: contains sand, clay, and water
2) Dry-Sand: Contains organic binders
3) Skin Dried: Drying surface of a green sand mold

Question 8

Typed of Expendable Mold

Answer 8

1) Shell Molding: Mold is a thin shell of sand bonded by a thermosetting resin
2) Expanded-Polystyrene: Mold of sand packed around polystyrene foam pattern
3) Investment Casting: Wax pattern coated with refractory material