auswelder; You have a couple of issues in at play. well several actually depending on the thickness and strength of the material you are forming.
First off And I have in the past had to make dies and punches similar to yours. When using an angle iron as your die the problem there is there is no bottom relief so any material you press into it can not be pressed beyond 90° this becomes more prevalent when using what is called a bull nose radius die such as yours. the work piece is going to have a certain amount of spring back no mater the thickness or type of material. It would be less noticeable with a smaller diameter nose but still there.
You could add a couple strips of steel to your die to make the top of the Vee slightly smaller like say 2 or 3 mm per side extending down in the angle iron about 10 mm this should solve your problem for forming work pieces up to 2 or possibly 3 mm with the punch and die set up you have, or you could remove the flux from a couple of welding rods and weld them to the angle iron as I have shown in the drawing
Also these charts may help you
SheetMetal.Me – Air Bend Force Chart.pdf
this one explains the spring back I was talking about as well as has dome useful information on spinning die forming roll forming and deep drawing os if others have interest in these they may be helpful to you as well
Sheet Metal Forming.pdf
Last edited by Frank S; 09-13-2018 at 08:16 PM.
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