forces required to bend tubing

[NickE]

I'm looking for information and descriptions of the maths for calculating the forces required to permanantly bend tubing using a fixed die and rolling wiper. Anyone have any suggestions for this metallurgist who's a bit out of his element?

I can post a schematic of the machine in a bit if that will help.



Nick

 

[desertfox]

Hi NickE

Here is a starter:-

http://www.bendtooling.com/BTI_RotaryDrawTubeBendingGuide.pdf

trying to find some formula's you can use to estimate bending and will post later

 

[desertfox]

hi

Couldn't find specific formula for tube bending but found this for sheet metal bending which is different:-

http://classes.engr.oregonstate.edu...01/Laboratories/7.Metal Forming_bending-1.pdf

what you need to do is find the plastic bending moment formula for the tube in question from which you can estimate the force required to bend the tube.

Another article on plastic bending of beams:-

http://freeit.free.fr/Case,Chilver,Ross_Strength_of_Materials&Structures,1999/19206_15.pdf

 

[metengr]

Talk to these guys

http://www.bendtooling.com/formulas.htm

 

[chicopee]

You can also refer to some strength of material college textbooks such as Singer and find info. on tube bending, not necessarily on the forces and torques required to bend tube but on springback after bending.