The difference between aluminum alloy casting and die casting
Aluminum alloy casting and die casting are two different casting methods. Casting refers to the process of injecting molten aluminum into the mold under the action of the earth's gravity, also known as gravity casting; die casting refers to the process of injecting molten aluminum into the mold by external force (except gravity).
The aluminum alloy casting and die casting processes are different, and the properties of the obtained aluminum die castings are also different. They each have their own advantages and disadvantages:
The advantages of die-casting parts: good appearance quality, high surface finish, small casting tolerances, and high production efficiency; the disadvantages are: subcutaneous pores cannot be avoided, which makes the die-casting parts unable to undergo T6 treatment. In addition, due to the existence of subcutaneous pores, the machining allowance of die castings should also be controlled within 0.8mm. Exceeding this range will penetrate the dense layer of the surface and expose the subcutaneous pores, causing the workpiece to be scrapped.
The advantages of casting parts are: the structure is the same, detailed and compact, and the mechanical properties are higher than die casting parts, and can be strengthened by heat treatment; the disadvantage is that the dimensional tolerances are larger and the processing volume is larger (usually the processing volume is generally 2~5mm) , The production efficiency is low, and the appearance quality is relatively poor.
The manufacturing methods of aluminum alloy die casting process include high pressure casting (using cold die casting machine or hot chamber die casting machine), and low pressure casting (using dry low pressure production).
The casting methods of aluminum alloy casting process include: sand casting (sand casting), metal casting (steel mold casting), lost foam casting (foam casting) and shell casting (coated sand casting).
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