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Old 07-01-2022, 02:25 PM
HeavyMetal HeavyMetal is offline
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Default What Technique is Used To Shape This Form?

Hello everyone.


I was wondering what technique is used to shape this form? Is it just hammer forming or there are other techniques involved?



447184d4264e707fddbe168ad5a74665.jpg
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Old 07-02-2022, 09:54 AM
Marc Bourget Marc Bourget is offline
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Is this a frame for a porthole window mounted on the wall of a building?


Material?
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Old 07-02-2022, 10:12 AM
crystallographic crystallographic is offline
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Quote:
Originally Posted by HeavyMetal View Post
Hello everyone.


I was wondering what technique is used to shape this form? Is it just hammer forming or there are other techniques involved?



Attachment 63776
Hi Michael,
This is a shape that is created as a regular toroid shape, by "just" metal spinning.
The symmetrical part is then fully-annealed and then "just" press-formed in offset dies, trimmed and then polished.
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Old 07-02-2022, 01:40 PM
HeavyMetal HeavyMetal is offline
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Quote:
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Material?

SAE 304 stainless steel
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Old 07-02-2022, 01:45 PM
HeavyMetal HeavyMetal is offline
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Quote:
Originally Posted by crystallographic View Post
Hi Michael,
This is a shape that is created as a regular toroid shape, by "just" metal spinning.
The symmetrical part is then fully-annealed and then "just" press-formed in offset dies, trimmed and then polished.

Hello Kent,


I have been to many spinning shops but never seen them doing a toroid shape especially on a stainless steel sheet. The material used in spinning shops is mostly brass and copper. Stainless steel needs double effort for spinning. Also the offset die theory for the symmetrical part doesnt seem to be a working method since the other side of the shape would shrink under the pressure. Do you have any pictures or videos of this process you mentioned? Thank you.
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Old 07-02-2022, 03:49 PM
crystallographic crystallographic is offline
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hmmm....
Sounds like actually needing the "recipe book" for duplicating the part, to me.
Step-by-step formulae ... for exact results.....hmmmmm?
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Old 07-02-2022, 08:13 PM
BTromblay BTromblay is offline
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Hi,

Do you have several more photos of the part and approximate size? 304 stainless is shape-able depending on the profiles.

Bill
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Old 07-02-2022, 11:46 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by BTromblay View Post
Hi,

Do you have several more photos of the part and approximate size? 304 stainless is shape-able depending on the profiles.

Bill
Other stainless alloys are easier to work than 304, Bill.
This part is no biggie.... I've seen these artsy parts around for a while.
.... 24in. O/A D. would be large-ish, x 5-6in deep.
(From what I know, Rohr Industries made nacelle lip skins and other round items for large units, for a long time.)
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Last edited by crystallographic; 07-03-2022 at 04:58 PM.
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Old 07-05-2022, 06:08 AM
Blackfinger Blackfinger is offline
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Default EWheel?

Thin lover anvil and a band on the top one?
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Old 07-07-2022, 12:53 PM
fciron fciron is offline
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Iíve seen toroid shapes spun. The inside is spun first with the excess material following a nice curve curve. The whole piece is reversed onto a second Chuck where the outside is formed.
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