40mm box section bending strenght

[s410man]

Is there a chart anywhere for showing force needed to bend box section?

120mm wide vee and i need to bend 40x40x3 shs to 10 degrees

Just trying to work out how big a ram i need to make a bender

Cheers

 

[dan.taylor.1]

I think it'll just deform with a break type bender. You need something with a mandrel / die to keep the box as square as it can be.

Often when box is used in like bed frames etc they deliberately deform the inside and outside of the bend leaving the sides flat.

 

[James1979]

I am on a call out so don’t have it with me but if you get a product manual from a steel stockholder they tend to have that in there.

I have books but pdf is probably somewhere.

Just Google their names

Barclay and Mathieson
Barrett Steels
Kloeckner

I use

Edit. Quick search while I’m eating - you want p38?

https://www.libertygfg.com/media/164195/design-capacity-tables-for-structural-steel-hollow-sections.pdf

 

[gaz1]

you dont say if you want a sharp or shallow bend its just as easy to slot cut and weld to create the corner if you havent got a bender

 

[s410man]

I think it'll just deform with a break type bender. You need something with a mandrel / die to keep the box as square as it can be.

Often when box is used in like bed frames etc they deliberately deform the inside and outside of the bend leaving the sides flat.

Only a 10 degree bend so even if it does deform the sides slightly not the end of the world

Will probably make the top tool out of some large diameter bar to help aswell

 

[s410man]

I am on a call out so don’t have it with me but if you get a product manual from a steel stockholder they tend to have that in there.

I have books but pdf is probably somewhere.

Just Google their names

Barclay and Mathieson
Barrett Steels
Kloeckner

I use

Edit. Quick search while I’m eating - you want p38?

https://www.libertygfg.com/media/164195/design-capacity-tables-for-structural-steel-hollow-sections.pdf

I did actually find that exact chart when i was googling to see if i could find a answer before posting a thread on here

But after staring at that chart for about 5 minutes i came to the conclusion i didn't have a clue what it all meant

 

[Ged93]

Well I've seen this trick on Youtube from a Yoshimura exhaust craftman who was bending a circular titanium tube .

The tube must be filled completely with sand ( the sand must stay inside the tube clearly ) , then you need a work table where you need to weld/fix/screw some pins in order to follow the shape you want to obtain .
Then apply some heat with a oxyfuel torch , put the tube in the jig you created and apply force to bend it .
Sand will keep in shape the tube .

In this case you should use a longer piece of tube and then when cold you have just to cut it .

 

[tigdlo]

I have asked similar recently but I didn't want it to bend, see Design plastic bending moment resistance in this link, https://eurocodeapplied.com/design/en1993/shs-design-properties but may need more as there will likely be some margin in the values.

This calculator may help too, https://clearcalcs.com/freetools/beam-analysis/au

 

[carbonarc]

If it is intended to bend the 40x40x3 SHS supported over a span of 120mm it will be necessary to have a ram with a minimum force of 70Kn [7 imperial tons] to ensure the material has yielded and does not "spring back". The other information that has been provided regarding cutting and welding should be considered as the bent shape of the piece may not be as required. Good luck.

 

[Hitch]

If its just a few shallow ones a normal pipe bender does fine.

When you say 10⁰ I gather you mean not much of a bend.

I'd be inclined to use a bigger v, to reduce the tonnage required. Bigger the v, larger the radius, means less sidewall deformation.

 

[James1979]

I did actually find that exact chart when i was googling to see if i could find a answer before posting a thread on here

But after staring at that chart for about 5 minutes i came to the conclusion i didn't have a clue what it all meant

Page 88 sorry.

There’s a table about bending to yield over a known span. Unfortunately yours is less than the lowest example (120mm vs 500mm) but at 500mm you need 22kn

There’s formulas there to work out the 120 I think but “a lot” would be a reasonable estimate.

 

[s410man]

If it is intended to bend the 40x40x3 SHS supported over a span of 120mm it will be necessary to have a ram with a minimum force of 70Kn [7 imperial tons] to ensure the material has yielded and does not "spring back". The other information that has been provided regarding cutting and welding should be considered as the bent shape of the piece may not be as required. Good luck.

Thank you thats exactly what i was after!

Will hopefully get these rams ordered and bender built in the next week or 2 now!