UPDATE 2:
I guess the real issue is how to interpret the OP's drawing.
Upon closer inspection this is how I interpret it:
The 980 dim locates the bend line for Q-Q @ 2.25° & R887.6 (Twist Diagram).
The pair of 539 dims locate the bend line for P-P @ 2.25° & R887.6 from Q-Q (Twist Diagram).
The 185.5/12° bend line is for 'X', which is shown in the extreme RH view.
'X' is an arc @f R887.6 with a chord of 371 that deforms the Q-Q bend.
That means this blade has intersecting bends, so it won't flatten in sheetmetal b/c it's deformed 'unnaturally'.
But if 'X' is only a partial bend that begins as an arc at the left end and then tapers down to nothing on the right before Q-Q, then this part can be flattened.
In any case, I could not build this in Inventor 2010 using bends, b/c the Bend tool won't bend more than once, and I need at least 2 bends. The way I tried doing it is by first bending R-R up, then bending P-P down and then bending 'X' up. But on reconsideration, it seems best to make this using surfaces and then thickening it. The views in the OP's drawing are deceiving b/c they are not standard to anything that I've seen. Also, I'm not sure which view is 'Detail X'?
... Chris
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