Metal Spinning and Submarine Hatch Doors

What happened? I thought we had already been here.

1. Hydroforming, deep draw and stampings by Ultimate HydroformingStandard Forming (Stampings), Laser cutting, Welding, and CMM inspection to specialty processes such as Hydroforming, Robotic Welding, and Heat Treat.
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3. HYDROFORMING.NET the international hydroforming web siteHYDROFORMING . NET the International hydroforming forum and web site.
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4. Hydroforming Equipment Information on GlobalSpecHydroforming equipment uses fluid pressure to form tubular ferrous or nonferrous materials to the shape of a die.
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   Will your phenolic tooling withstand the pressures?
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7. Could it be as simple as concentric steel rings attached to two platens of a hydraulic press?

Out of curiosity - how caps, deep source pans or even electric motor housings small scale types are shaped?

I tried to find out more about these under 'metal draw' but I could never find proper illustration or good enough explanation.

Any clue?

Deep sauce pans are spun. Aluminum caps and motor housings, I don't know.

Look here::

Metal spinning - Wikipedia, the free encyclopedia

The alternative process you have envisaged looks very similar to Flexform / Fluid Cell Presses/ Bag Presses/ Bladder Presses used world over for mass production of aero space sheet metal components.

These processes are extremely accurate, versatile and are flexible to accommodate limited to mass production. The tool design and tool manufacture for these processes is also a very highly specialized requiring considerable expertise.

http://www.avure.com/smf/products/default.asp will give you some idea of the technology involved.

My suggestion for the kind of aluminum component you have described will be continue with spinning which is most optimum technique.

1. Inexpensive.
2. Simple tooling.
3. Virtually no spring back.
4. Very little scrape.
5. Universally available technology.

Next best process I could think of is to go for drop stamp forming. Dies for drop hammer forming are usually made by casting metals such as kirksite. These dies can be rapidly produced; are more economical than permanent dies; can be melted and recast; and can be reinforced at selected points of wear by facing with harder material, such as tool steel for long production runs. The metal is slowly forced in shape by controlling the impact of blows. In many instances, it is necessary to use drawings, rings, 2 or 3 stage dies, supplemental equipment, and hard forming such as bumping hammer, wooden mallet to remove wrinkles, etc. To successfully complete forming operations, another aid that may be necessary is to anneal material between die stages and intermediately for single stage die forming

I work in spinning shop. We can do d20" dish.

Here is a video of making one of our product: http://img353.imageshack.us/img353/888/mvi0321.mp4

We also have CNC punch.

We're in Toronto, Canada. We can take a look at what your need and see if we can help. Please send me a message.

Have you considered buying the spinning business, thus reducing your costs?

How do these various processes sit in relation to threading, can they accomodate it or does it have to be a post process on different equipment etc?

Depends on the kind of thread.

I had the privilege to observe skill with which a good spinning operators elegantly performing trimming, threading and edge folding, post spinning, with simple self made improvised tools without removing the parts from the spinning mandrel. Their skill for improvisation with years of experience can be breath taking.