Will this sheet metal bend tear?

[Spiritwalker2222]

I'm looking to make a sheet metal part that has a bend on a 45 degree angle to the main axis. If I don't relieve the ends, do you think it will tear?

I'll be using 5052-H32 aluminum in 11 gauge. Using a press brake. I guess I should use some scrap pieces to see what will happen. I can make a bend relief, but the flat shape is much simpler without it.

 

[4 FN 27]

I'm looking to make a sheet metal part that has a bend on a 45 degree angle to the main axis. If I don't relieve the ends, do you think it will tear?

I'll be using 5052-H32 aluminum in 11 gauge. Using a press brake. I guess I should use some scrap pieces to see what will happen. I can make a bend relief, but the flat shape is much simpler without it.

3D ISO View would help a ton.

I assume it is a Hem???

You will get a little tearing. It helps that you will be 45° to the gain of the Material.

You can buff out the corners on a Scotchbrite Wheel or file them.

 

[Spiritwalker2222]

Yes, it is a hem. Here are a couple isometric images.

Thank you for your feedback.

 

[4 FN 27]

Yes, it is a hem. Here are a couple isometric images.

Thank you for your feedback.

Nice...that shouldn't be too bad (the tearing) with an open Hem.

Now forming it will be a little tricky with that last hit being so deep.

Looks like something I would do...

Edit: Forgot to mention if you buff the edges where the Hem will be it should not tear as much.

 

[readhead]

Ease the edges at the hem and that should reduce the tearing.

 

[Spiritwalker2222]

My plan is to bend it to 110 degrees and then "flatten" it into a teardrop hem and see how much bend back I get.

I just don't want to get a crack that will propagate. Although I guess I can always drill it out.

 

[rwa2004]

I design a lot of these types of things - and then I get yelled at.

You give up some strength when you go to 3003AL, but you will get much lower risk of tearing. One of the shops I work with will frequently tell me that I have to use 3003 instead of 5052 or else they won't do it because of tearing.

 

[4 FN 27]

My plan is to bend it to 110 degrees and then "flatten" it into a teardrop hem and see how much bend back I get.

"Flatten" it with shim of the thickness of the opening and pull the shim out. We do it all the time to create an open hem.

 

[4 FN 27]

I design a lot of these types of things - and then I get yelled at.

We never yell at people for their designs...but we do charge them for the difficulty. This little gem cost $3000.00 to make one by the time we got done with the Press Brake Tooling and Engineering.

View media item 94864

 

[hawkeye2]

I’d anneal it first. Mark the bend line with a marker heat the backside until line fades mostly away, and let it cool

 

[LXCam]

We never yell at people for their designs...but we do charge them for the difficulty. This little gem cost $3000.00 to make one by the time we got done with the Press Brake Tooling and Engineering.

View media item 94864

That’s an impressive piece pat.

 

[Jim greengo]

Would annealing it 1st help?