How much expansion?

How much expansion?

This topic has 7 replies, 4 voices, and was last updated 30 January 2016 at 11:15 by Roger Head.

Viewing 8 posts - 1 through 8 (of 8 total)

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30 January 2016 at 03:53 #223136
Bruce Edney
Participant
@bruceedney59949
Hi folks

I have a ring of cast iron about 155mm ID 210mm OD and will be 12mm thick. If I heat it to say 300 deg C can some tell me approx what size the ID would increase to?

Thanks

Bruce
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30 January 2016 at 03:53 #29571
Bruce Edney
Participant
@bruceedney59949
30 January 2016 at 07:11 #223141
pgk pgk
Participant
@pgkpgk17461
I think that it's as simple as looking at the missing central disc i.e cast iron 155mm long.

coeff expansion I found was 0.0000112 / degC so from say 20C to 300C for 155mm = 155 x 289 x coeff = 0.48608 for a new id of 155.48608.
30 January 2016 at 07:32 #223143
Roger Head
Participant
@rogerhead16992
pgk pgk is correct, 'cept for the typo

155 x 280 x coeff = 0.48608 for a new id of 155.48608.

There are slight variations quoted for different types of CI, and the CTE changes with temperature, but the effects are small and would only change the ID by one or two thou. The following horrible link brings up pages 295-298 of the Iron Castings Handbook which shows the effect.

https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=10&ved=0ahUKEwjLyqaV-9DKAhXDKWMKHVXTB2kQFghKMAk&url=http%3A%2F%2Ffiles.engineering.com%2Fdownload.aspx%3Ffolder%3Db1e13803-7e48-479f-ae19-67666ee8c97b%26file%3DIron_Castings_Handbook_4th_Edition_-_Thermal_Expansion.pdf&usg=AFQjCNFrTGDj2Ee1KzAXqlWC-xbRgmYQIg&sig2=ZTACQ5c2_EgulHd2JODncA&bvm=bv.113034660,d.cGc&cad=rja

Roger
30 January 2016 at 08:03 #223144
Bruce Edney
Participant
@bruceedney59949
Thanks guys

Looks like I have to do a bit more machining

Bruce
30 January 2016 at 08:10 #223145
pgk pgk
Participant
@pgkpgk17461
If they gave out degrees in typo I'd have a first.. thanks for the correction.
30 January 2016 at 08:43 #223149
Michael Gilligan
Participant
@michaelgilligan61133
Roger,

I present your 'horrible link' in friendlier forms, for those of a nervous disposition:

**LINK**

Thanks for finding it.

MichaelG.
30 January 2016 at 11:15 #223184
Roger Head
Participant
@rogerhead16992
Yeah, thanks Michael. I know, I should have done that.

Interesting to see Fig 2 in that reference and read of Ni-Resist. I used Invar in some laser opto-mechanics in the past (20 years ago), but I was never aware of a casting alloy. I wonder what's available now…

Roger
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