PDF 11

Question 1

Advantages of Casting :

Answer 1

• Can create complex part geometries
• Can create both external and internal shapes
• Can produce very large parts
• Some casting methods are suited to mass production

Question 2

Disadvantages of Casting:

Answer 2

• Limitations on mechanical properties
• Poor dimensional accuracy
• Safety hazard to workers
• Environmental problems

Question 3

Change from liquid to solid volume will increase .

It is called ——— .

Answer 3

Shrinkage

Question 4

• Use an expendable mold which must be ——– to remove casting .
• Use a permanent mold which can be used to produce —– —–

Answer 4

• desrtoyed

- many castings

Question 5

Cope =

Drag =

Answer 5

• upper half of mold

* bottom half

Question 6

What is this

• is a source of liquid metal to compensate for shrinkage of the part during solidification.
• it is waste of material
• designed to freeze after the main casting in order to satisft its function.
• To minmize waste in the unit operation , it is desirable for the volume of metal in the ——– to be a minimum.

Answer 6

Riser

Question 7

Mold constant Cm depends on :

Answer 7

• Mold material
• Thermal properties of casting metal
• Pouring temperature relative to melting point