Advantages And Disadvantages Of Pressure Casting
The advantages of pressure casting are as follows:
1) High productivity, can be die-casted 50 to 150 times per hour, up to 500 times, which is convenient for automated and semi-automatic production.
2) The casting has high dimensional accuracy and smooth surface (CT6～9, Ra0.4～3.2 μm).
3) The castings are cooled quickly, crystallized under pressure, the grains are fine, and the strength and hardness of the castings are high.
4) It is easy to inlay casting. Some complicated parts can be die-casted many times, simplifying the die-casting mold and manufacturing process; it is convenient to inlay different materials together to realize one piece of material and improve the performance of a certain part.
The disadvantages are:
1) The equipment investment is large, the molding type has a long manufacturing cycle and high cost, and only a large amount of production has economic benefits.
2) The type of alloy is limited. For high melting point alloys (steel, cast iron, etc.), the prototyping and die casting chambers have a low life.
3) Filling and cooling are fast, it is difficult to make up the thick wall, and it is easy to shrink.
4) The speed of die casting is extremely high, and the gas in the pressure type cavity is difficult to be removed, resulting in a large amount of finely distributed fine bubbles inside the casting.
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