Square steel tube bending dies

Sheet Metal Fabrication techniques, questions and help. "Tricks of the Trade"

Moderators: Harold_V, GlennW

Post Reply
User avatar
Posts: 416
Joined: Sat Jan 04, 2003 12:59 pm
Location: Central lower ALabama

Square steel tube bending dies

Post by Roy » Thu Feb 12, 2004 2:20 pm

Anyone have a pic of what the profile for them would be? I would be game to:
A: Adapt my Harbor Freight pipe bender to bend square tube.
B. Adapt the hosefield type Harbor Freight bender to bend steel tube.
C: Make a bending machine fromscratch.

I checked out Shop OUtfitters website but they do not really have a good image of square tube dies. I would like to go perhaps 180 but would be satsified with a good 90 deg bend in 1/2 thru 1" tube not heavier than 14 ga, most likely most would be 16 ga materials. The wife has me on this garden ornament making kick to justify her allowing me to buy my MIG machine so now I have to produce a few items every now and then off her ever growing list.

I assume round tube dies would merely be round dies with a radiused groove to accept the tube OD, but not quite sure on square tube. It does not matter if the sides of top and bottoms get drawn in / shrunk somewhat during the bending process.

I have been using a piece of pipe for a die in my homemade press brake and it works somewhat but leaves a lot to be desired. I would like a more uniform approach and more uniformity to the bends.

James C

Re: Square steel tube bending dies

Post by James C » Thu Feb 12, 2004 3:21 pm

I've seen people cut a bunch of slits or wedges on the inside radius before bending, and then weld them up and ground smooth. You'll get a pretty, uniform bend, but with more work.

Just an idea.

User avatar
Posts: 484
Joined: Sun Jan 05, 2003 10:14 am
Location: Delray Beach, FL (USA)

Re: Square steel tube bending dies

Post by Bryan » Thu Feb 12, 2004 3:50 pm

From memory, they are basically a flat roller with a bead on the inner one (in the center) to collapse the inner faces into the section of the square, whereby giving somewhere for the excess material on the inner face to go... this way it is only the side faces that have to "bend"... the outer face will bow in a little as it resists stretching around the bend...
Look at the legs/frame on steel furniture to get an idea of what happens...
[i]"Simplicity is the ultimate sophistication."[/i] Leonardo da Vinci (1452-1519)


Re: Square steel tube bending dies

Post by Daniel. » Thu Apr 15, 2004 11:58 am

I have tube bending machine for sall. the machine is of type Schwarz & Wirtz C80..year of manufacture 1975.
if you are interssted please contackt me..
Daniel +46 737289725..


Re: Square steel tube bending dies

Post by shark » Sat Apr 17, 2004 7:59 am

hey roy I made a die for bending 1" square tube I can't do 180 degree Probly be hard to remove from die but it can be done i think i couyld make a die do thatI'll try to explain the die I t's just like a conduit bender I took a piece of 1" plate and cut out a bit more than a quatarof a circle around the eged i welded a piece of 1" C channle heat and bend it around weldit to the plate. then i took a piece of round bar i can't remember exact size it layed right in the C of the C channle probly 5/8 or 3/4 round bar this starts the bend it crushes the inside wall of the tube as the bend starts like bryan said. Then i welded sides on the !' plate to keep the sides of tubing from expanding. This die bolts to a machine my grandfather made for twisting fence pickits it will twist 3/4 inch solid bar cold it's a big worm drive gear box and 2horse motor . i made a cam switch I can set and it will bend the same bend every time 90's 45's not quite a cnc bender but it works I don't have any pics of it or none in the computer but if your near nashville your welcome to come see it Mark barnes nashville tn.

Post Reply