Gray cast iron is an important engineering material that is widely used in the manufacturing of automotive components, especially brake disc rotor. From experience, it is observed that the Eugene frequency of GCI brake discs varries over time. That is the eugene (natural) frequency of freshly cast GCI brake discs is quite different from the same GCI discs which was determined after 3 or 4 weeks of production. It is also noted that their machinability varied as well.
Can someone provide an insight into the mechanism behind this variation in natural frequency and machinability of these GCI brake discs? How can this be controlled or minimized? Your suggestions and contributions are highly appreciated.
At Lucas, thank you for your suggestions. I really appreciate it.
We have monitored the natural frequency of GCI disc from the day it was cast till after two months. It was observed that the natural frequency varied over this period. Does it meant that the mophology and graphite content of this GCI disc changed with time?
This is indeed an interresting topic. In studys done at AC Floby we have followed the behaviour of a freshly casted brake disc and its natural frequency behaviour over time. It was conluded that the out of plane modes OPD 0/2, 0/3 and 0/4 will increase over time. After 30 days we had the following:
- The 0/2 mode moved upward 7Hz
-The 0/3 mode moved upwards 14Hz
- The 0/4 mode moved upwards 29Hz.
Something is definitely happening in the GCI when comparing the freshly casted and the aged GCI. It is said the the tensile strength normaly increases 5-15% during aging in room temperature.
I did send a recommended paper to you from Research gate Samuel!
Hello Lucas,
Thanks for your comments. See the input from my colleague, Nicholas, in response to your question.
Lucas, thanks for your feedback.
Some of the questions you have might be answered by reading an article here at Researchgate. Try searching for "Cast iron mach inability:the effect of aging on material properties determines the optimal machining time." and you will find an interresting article in this topic.
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