bending sheet metal that has a big radius

[stephenson513]

he there

We have an issue where we are trying to bend a 1mm sheet with a 24mm radius.

The one side must come out 105mm wide and the flange must be 50 mm wide. inventor gives a flat pattern width of 143.4

If we bend using a brake press and a 24mm tube blade then it wont come out the right size. its like the flat pattern isnt big enough.

we get the 50 mm flange but whats left over is 99 and not 105. How do we deal with something like this?

thanks

[mpatchus]

Is this what you are trying to achieve?

[Mario428]

I would have said your K factor is not right but even a K factor of 1 will not gain enough material.

My next thing to check would be the actual radius of the part, sounds like the material is pushing away from the punch and ending up a smaller radius, have seen this happen many times. Press operator needs to put a pc of urethane or similiar in the die so that the material stays tight to the punch.

If the radius ends up smaller than the modeled radius one leg of the bend will short

[stephenson513]

ok we actually made a stupid mistake 😕 we kept seeing the 24mm RADIUS as the size of pipe that we should use not thinking that 24 is the radius and not the diameter!! yes very dumb of us. we will now try a 50mm pipe since we dont have a 48mm anywhere

but thanks for helping

[Mario428]

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@stephenson513 wrote:
ok we actually made a stupid mistake 😕 we kept seeing the 24mm RADIUS as the size of pipe that we should use not thinking that 24 is the radius and not the diameter!! yes very dumb of us. we will now try a 50mm pipe since we dont have a 48mm anywhere

but thanks for helping

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We get that all the time at my workplace. The fabricators occasionally need a designer to point out their mistakes are the problem not the design or drawing. LOL

Glad you found the issue