Welcome to SolidWorks forums Selvaraj.
This should take care of your need: Quick tip on flattening a screw conveyor flight
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there are no bend lines when you do this in sw 2012 ...
how can we get the bendlines?
I would doubt for that
Good luck with the bend lines. We have been trying to get Solid Works to do bend lines since 2004. 80% of what we do is sheet metal. It's a shame we have to use someone elses sheet metal package just to get bend lines.
I've only seen screw flights formed on specialized equipment and bend lines are not required.
What do you need bend lines for?
How are you making these parts?
Also the flat pattern is not accurate when using lofts.
You usually need to develop trial parts for accurate final O.D. & I.D.
The flats I've seen always have the slit as small as possible to maximize material usage.
In the real world the ends will overlap (theoretically pass by each other) a lot farther than the model depicts.
What that means is, if you model the screw in SolidWorks as an assembly, the seams of the flights will be aligned down the entire length of tube.
In the real world the seams will start clocking a few degrees for each flight added. The seams will never be in line, they will always be staggered.
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