How can i make two folds in a sheet metal without any errors?/ problems with flange measurements.

[302891469]

Hi all, 

1. I'm working on a school project where I need to bend all the edges of a sheet metal (see picture/ the red represents the folding lines).

But when I try to fold 2 edges next to each other an error message pops up and this happens (see picture). BTW, in this picture I'm talking about the upper right corner.

2. I tried to use flange, but I encountered a problem with the measurements. I made a test drawing (see picture). 

I drew a 20 × 20× 0,5 mm square and added (with flange) 25 on each side, but as you can see all the dimensions are incorrect. Why is that and is there any way to fix it?

Thanks for your time and effort.

[JDMather]

Attach the *.ipt file of your attempt here.

[302891469]

Note: I made it in Inventor 2021. I drew the folding lines on the top of my sheet metal. These are also the edges where I tried to flange.

Thanks

[IgorMir]

It is not quite clear what is it you are trying to model. But it appears - you would like to read on sheet metal design and fabricating principles first. Then you will get a better grasp as to why the Flat Pattern of your model is smaller, than you would have expected it to be.
The attached part in IV2020 format might give you some ideas as to how to model that trapezoidal part.

Cheers,

Igor.

[James_Willo]

Hi Ismail, when you bend a part, the fold is done right on the line and it has to take some material from somewhere to get the bend. This is why you are getting your problem. 

You can change where it bends from, but be aware you might not get the flanges the correct length to match your final target. 

You need to add relief notches to your original to bend it properly. 

Here's where to change the fold location:

[guido_66]

Why are you starting with a flat pattern? The normal method is to design the part that you want with folded flanges, and let Inventor create the flat pattern.

[JDMather]

---

@302891469 wrote:

1. I'm working on a school project ...

2. I drew a 20 × 20× 0,5 mm square and added (with flange) 25 on each side, but as you can see all the dimensions are incorrect. 

---

1. First thing I notice is that your Sketch1 is not fully defined?  This should have been covered by your instructor in the first 20 minutes of first Inventor class.  Where are your dimensions.

2. When you bend sheet metal it stretches - so the flat pattern size is correctly smaller to account for this stretching of material to result in the correct Finished Form dimensions.  This is controlled with K-Factor in the sheet metal properties and depends on Material, Thickness, Bend Radius and Bend Angle (refer to Machinery's Handbook for the equations).

3. As noted by @guido_66 you should generally model in Finished Form and let Inventor calculate the Flat Pattern Bend Allowance (stretching) for you.

4. Model the part as best you can (using any tools - it doesn't have to be as sheet metal) and then Attach the file here and someone will demonstrate the best technique using the Sheet Metal tools.

[302891469]

Sorry for the late response, but the project is currently on hold due to other more important stuff.