有色金属铸造培训材料.ppt

H Non-Ferrous Casting Alloys
Introduction
Aluminum Alloys
The Al-Si System
Microstructural Modification
Degassing
Heat treatment
Specifications, Properties, Applications
Magnesium alloys
Specifications, Properties, Applications
H Non-Ferrous Casting Alloys
Literally any casting alloy not iron-based
Aluminum
Magnesium
Z
Inc
Copper its alloys(brass/bronze
Titanium
Cobalt
Non-Ferrous Castings
Brief History
-3000 BC-First cast objects(copper)
1775 AD-N-F foundryman Paul Revere rides Boston- Lexington
1849-Manually operated die casting machining patented (lead
1876-First aluminum casting -an engineer's transit-chemically
produced Al is $1/oz
1884-Cast Al pyramid mounted on tip of Washington Monument
1886-Electrolytic Al reduction process discovered- Al goes
from $I5/lb. To
1903- Wright Flyer uses a cast Al block and crankcase(152 Ib
1907-Discovery of enhanced cast Al properties through heat
treatment
Non-Ferrous Castings
Brief History
1921- Modification of Si structure in cast Al discovered
1928- Alcoa develops Al vehicle wheel for truck trailers
mid-1950s- Squeeze casting developed in Russia
1958- Full Mold (aka Lost Foam) process patented
1969-Chevy Vega introduced- I"cast Al block with parent
metal cylinder bores
1981-GM begins production of Al cylinder heads by Lost Foam
process- Saturn makes all blocks, heads, cranks and diff cases in
1985
1988- Ford adopts Cosworth process for high volume production
1994-Dephi produces first squeeze cast chassis components
loden Casting, November 2002
Aluminum
Aluminum- Negatives
Pure aluminum is uneconomical and has
undesirable properties
Electrolytic reduction from bauxite ore is
difficult and expensive
Washington Monument
Very soft and weak
Aluminum- Positives
Pure aluminum has many desirable
properties
Good conductivit
Very resistant to uniform corrosion
Good strength-weight ratio
Recycling of aluminum is cost-effective due
to a low me