Forming and stretching plate

I a wanted to share this, I bought 500kg steel 6mm plate 250mpa and a char lynn motor with 320 nm torque to drive the big wheel and have polyurathane vee block on the other side
anyone want the dwg, free of course
the machine is vertical the plate hangs from an electric chain hoist on a monorail, 20 ft long plates, one man eh
wish I had an oxy/propane creeper cutter, I do not like steel at all

 

I thought that you were building your new boat from aluminium - or is she steel?
Or is this project something else altogether?

 

yes Alu
these wheels are cos I need if i flare topsides plates
if you Force plates into framing, you'll get weld local distortion eh

 

and making adjusting screw for the vee block

 

stretching and forming wheels

 

Aah, your'e building an English wheel, that wasn't clear to me from the dwg. But I wonder about the V-roller; to get the shape of a double curvature, the panel must be stretched by thinning in the right positions. This is done by pressing a cylindrical roller against a slightly domed one.

It seems to me that your setup will only cause a bending effect to the panel? I'd appreciate your thoughts behind the arrangement; what am I missing?

 

you make me smile
i have built one 100 vessels with compound hulls
see the solid cyl roller
it is driven buy a solid wheel with an 8mm face screwd hard
it stretches the plate in the belly, to form BANANA to enable the plate to go around the vessel longways
once this is done the plate is formed to fit the SECTION, changing at every frame
it is NOT an english wheel, it is a NEW ZEALAND plate wheels
the plate is hung from a mono rail the wheels stand vertical , it goes back and fwds a chain electrical hoist altering the height back and fwds
i can form a 7m plate ALONE 4 a daynow this
thank you for your comment
few k

 

Always happy to make boatbuilders smile!

....aha, interesting, haven't seen that version before (although working with alu for 50+ years and used the English one for over 40 yrs), but I can imagine some positive properties, so think i've got to test it for some double curvature water-jet ducting. The V-wheel; what stiffness is the PU, and what are the max and min diameters? Is the dia ratio between hard and soft roller critical?

 

Can you send a short video of it operating? This is a very interesting process to some members

 

i have not drawn the driving wheel, it will be 350mm dia. with a contact of just 8mm, it crushes the plaste between it and the parrellel hard roller to stretch the plate, doing this gives SOME form across the plate. any more form is done by the vee rollar
for tight radii I swap to an steel vee, in doing a nose i use a tiny vee
have no vid I retired in 2000, but MAY build again
I will draw the operation today
Some Dutchmen said it was the only thing they had learned in NZ, they were using a recipricaping press, out of the dark ages
In this case the driving wheel is hydraulic, the radial thrust on the ,motor axis is stopped by 2 bearings tight on the rear of the wheel to stop damage to the ,,motor brgs and seal
I can tell you that it is most satisfying to plate shapely vessels

 

Nieland shipbuilding press - The best partner for cold forming technology https://www.nieland.com/
hear at the start you will see the plate being stretched in the centre lengthwise , same principal.

 

Keep smiling.....afraid I don't get it, the Nieland reference actually shows their version of the English wheel. But you say you use a cylindrical roller and a V-shaped polyurethane (ie a "soft") roller. You then say you use a "driving roller", dia 350 mm x 8 mm against the cylindrical roller to start with, squeezing the material to stretch; well that is the principle of the English wheel, so what does the soft roller do, and how does it do what it does?

 

soft roller forms the plate across the plate, it is used by me , never seen it elsewhere ,stops leaving plate with marks, it has it,s limits ,more useful on 5083 alu or lighter steel, BTway enlish wheels do not use vee formers, Eng, wheels only stretch over a sorta egg shaped roller