Designing the Mold to Control
Cooling Rates and Solidification |
| The mechanical
properties (strength, ductility, hardness, machinability) of iron/steel alloys are
determined to a significant extent by the microstructure of the alloy formed during
fabrication and heat treatment.
If
sections of a ductile iron casting cool too quickly, the formation of iron carbide can
increase the hardness of the casting and reduce the machinability at that section.
Rapid cooling tends to occur at
thin-wall isolated sections. The casting engineer can retain the heat and prevent
excessively rapid cooling by the design and positioning of the risers that will act as a
source of heat and molten metal feed. |
|
The drawing shows the housing, oriented "base up" for
casting in the mold.
Select the section (#1, #2, or #3) which is thin and isolated,
where rapid cooling could occur and reduce machinability. |
|
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Choose a
Selection |
10 |
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