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Old 03-22-2015, 10:32 PM
hokie1999 hokie1999 is offline
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Default How are bulbous bows made

Hello, everyone. I've googled high and low for an answer to the following question w/o luck: How are the curved plates on ships' bulbous bows made?

https://www.google.com/search?q=bulb...ed=0CAcQ_AUoAg


Same question for Waterspheroids

https://www.google.com/search?q=Wate...w=1600&bih=765

Many thanks for your answers
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Old 03-22-2015, 10:50 PM
Samcord Samcord is offline
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Maybe something like this?
http://youtu.be/gOvMqjaYZGs
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Old 03-22-2015, 10:57 PM
Samcord Samcord is offline
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Or this. http://youtu.be/UFzxgSD4DRE
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Old 03-23-2015, 07:05 AM
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Wolfram Wolfram is offline
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Not sure I understand the question..."How are they made?"

I suspect they're made the same way the rest of the ship is made, through (flame) bending of the plates and then welding them together...?

This may help:

https://books.google.com/books?id=UT...ing%22&f=false

http://www.titansalvage.com/var/ezfl...ulbous-bow.jpg
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Old 03-23-2015, 08:44 AM
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Appear to be pieces of rolled flat plate.
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Old 03-23-2015, 08:58 AM
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USMCPOP USMCPOP is offline
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Pressing and "line heating" is one way.

Some pictures and explanation here: http://www.nsnet.com/shippicsP/view....ion=&offset=20

More automated: http://www.ihi.co.jp/var/ezwebin_sit...04d4e8d83d.pdf
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Old 03-23-2015, 10:52 AM
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That's classified info...
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Old 03-23-2015, 06:08 PM
hokie1999 hokie1999 is offline
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Quote:
Originally Posted by Wolfram View Post
Not sure I understand the question..."How are they made?"

I suspect they're made the same way the rest of the ship is made, through (flame) bending of the plates and then welding them together...?

This may help:

https://books.google.com/books?id=UT...ing%22&f=false

http://www.titansalvage.com/var/ezfl...ulbous-bow.jpg
Wolfram, thanks. Notice how the bow and the Waterspheroid are smooth curves. These are bent on three axes; not common. A brake bends on two axes, much more common.
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Old 03-23-2015, 06:09 PM
hokie1999 hokie1999 is offline
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Quote:
Originally Posted by moe1942 View Post
That's classified info...
You're right, moe1942, not easy to find
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  #10  
Old 03-23-2015, 06:10 PM
hokie1999 hokie1999 is offline
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Quote:
Originally Posted by Samcord View Post
Maybe something like this?
http://youtu.be/gOvMqjaYZGs
Yes, Samcord, I thought of spin-forming, however it would have to be a huge spin-former for a water tower
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