Oil Canning on punched parts

[schulkfl]

All,

We are currently running 18g mill gal parts on a Trumpf 5000R and having issues with the waviness that is present in the part.

Specifically the issue is present in a checkerboard pattern we have created for maximum airflow. We run 5 10x70mm punches in one orientation and then 5 punches of the same size at a 90° angle. We have about 2mm of material between each punch. This pattern occupies about 1 square foot. The end result is that our checkboard pattern is very wavy and we're not sure why. We are using a whisper tool and have tried using a presser foot and different tool sequencing but haven't had much improvement.

I do not believe this is caused by residual stresses or the profile of the tool (whisper); the reason being that we have consistently run the pattern over a much larger area on 16g material with no waviness in the final part.

Anyone have any ideas or suggestions?

Thanks,

Fred S

 

[MechEng13]

Could reducing the die clearance help, the tool may be trying to extrude some of the material into the die.


Just a thought.




MechEng13
Manufacturing Engineer

 

[hendersdc]

Do you have any tall dies anywhere near this station in the turret?

I agree with MechEng13, make sure you have the propper die clearance. Too little will stick and could deform the part as well.