Spinning or drawing
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Mike Everman
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Spinning or drawing
Just a preview of my more production style part set. I'll be trying both deep drawing and spinning for the cones.
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Mike Often wrong, never unsure.
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skyfrog
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re: Spinning or drawing
Have you ever tried high strain rate forming. Use a concrete mold, place the tube inside, and put in some black gun powder, ignite it and the tube will be deformed in high strain rate to the desired shape, this is a no welds design :-)
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Mike Everman
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re: Spinning or drawing
Nope. though I did some work on the National Ignition Facility, and it had a spherical chamber 10m in diameter, welded together from explosively formed soccer ball sections, 4-6" thick. Now that must have taken some TNT!
There is a machine that can spin this whole motor, but so far I haven't found anyone that has one.
There is a machine that can spin this whole motor, but so far I haven't found anyone that has one.
Mike Often wrong, never unsure.
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Mr. Yuk
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re: Spinning or drawing
Luc & Viv have some experience in spinning. I have two of their nosecones that were spun out of 321 stainless.
I think all explosive forming uses low explosives like blck powder. If they used high explosives, their material and mold would be shattered.
I think all explosive forming uses low explosives like blck powder. If they used high explosives, their material and mold would be shattered.
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Viv
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Re: Spinning or drawing
Mike you would cry if you saw what I can spin now:-) those cones I can do in under 30 seconds! and thats in 321 the spinners grade from hell:-)Mike Everman wrote:Just a preview of my more production style part set. I'll be trying both deep drawing and spinning for the cones.
As to a one peace? no you cant swage the metal that far from the larger to smaller dia, or go the other way as it thins out too much.
Viv
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tufty
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re: Spinning or drawing
ISTR the Albion boys did a fair amount of hydraulic pressure moulding : might that not work?
Simon
Simon
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Mike Everman
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Re: Spinning or drawing
One piece would be done by an nc ID-OD tube spinner. Wild machine. Starts with tube.Viv wrote: Mike you would cry if you saw what I can spin now:-)
As to a one peace? no you cant swage the metal that far from the larger to smaller dia, or go the other way as it thins out too much.
Viv
viv,
Want to quote me on some parts? I'd want a dozen each of 2-4 sizes.
Mike Often wrong, never unsure.
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skyfrog
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re: Spinning or drawing
Hi Viv,
Forming limit of sheet metal is strain-rate sensitive. Under quasi-static condition (for example hydraulic bulging ) we cannot bulge the tube too much, as forming limits are easily reached, then necking occurs and leads to failure. But under high strain rate it is different story. In high strain rate forming tube behaves more like chewing gum than metal. It is possible to form it in one piece using explosive forming.
Forming limit of sheet metal is strain-rate sensitive. Under quasi-static condition (for example hydraulic bulging ) we cannot bulge the tube too much, as forming limits are easily reached, then necking occurs and leads to failure. But under high strain rate it is different story. In high strain rate forming tube behaves more like chewing gum than metal. It is possible to form it in one piece using explosive forming.