material: Aluminium,zinc & copper alloys; Serving industry: transportation; construction; architecture; die-casting is similar to permanent mold casting except that the metal is injected into the mold under high pressure of 10-210Mpa (1,450-30,500) psi. This results in a more uniform part, generally good surface finish and good dimensional accuracy, as good as 0.2 % of casting dimension. For many parts, post-machining can be totally eliminated, or very light machining may be required to bring dimensions to size. die casting, aluminum die casting
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Common aluminum alloys for die casting are summarized as follows:
|
Material |
Silicon |
Copper |
Tensile Strength MPa (ksi) |
Properties |
|
AA 380 (UNS A03800) |
8.5 % |
3.5 % |
324 (47) |
Fair easy to fill |
|
AA 384 (UNS A03840) |
11 % |
4 % |
331 (48) |
Easy to fill |
|
AA 386 (UNS A03860) |
9.5 % |
0.6 % |
317 (46) |
Good corrosion resistance |
|
AA 390 (UNS A03900) |
17 % |
4.5 % |
283 (41) |
Good wear resistance |
Minimum wall thicknesses and minimum draft angles for die casting are
|
Material |
Min. Thickness mm (in) |
Min. Draft Angle (ยบ) |
|
Aluminum alloys |
0.9 mm (0.035 in) |
0.5 |
|
Zinc alloys |
0.6 mm (0.025 in) |
0.25 |
|
Copper alloys (Brass) |
1.25 mm (0.050 in) |
0.7 |