Please let me know if you would like me to review a bending application that you have that you are having wrinkling problems or would like a free copy of our Tube Bending Trouble Shooting Guide.
The tube on the right side of the picture are the results. By changing the set up to a (2) Ball mandrel and incorporating a wiper die, the results were much better as seen on the tube on the left side.
Bend Die: Make sure it is securely tightened down. Use a cheater bar if necessary.
Mandrel: Position the front of the shank at the tangent point.
Clamp Die: Position it within .005 - .010 of the bend die insert. Make sure there is no slippage during the bend. This is the main cause of wrinkling.
Wiper Die: Position the tip to as close to the tangent as possible while not creating a negative rake angle. Start out with the wiper die as perfectly aligned with bend die insert as possible. (Use a straight edge to verity)
Mandrel Rod: Is used to adjust the position of the mandrel.
Pressure Die: Bring the pressure die in against the tube, retract it, and then adjust it in a little more. The pressure die should travel at the same speed as the tube when being bent.
*Premium Gel Mandrel Bending Lubricant is specially formulated for bending all types of materials: Steel, Stainless Steel, Aluminum, Copper and Titanium. It is used to lubricate the inside of the tube and the bending mandrels or to lubricate the outside diameters inside radius of the tube and wiper die, reducing friction during the tube bending process. Decrease scrap material and increase tool life. Premium Gel is also water soluble and washes out easily with water, Premium Gel will not cause smoke or toxic fumes when welding or at start up (Automotive applications).
**Premium Gel is easily pumped though all lubrication delivery systems lubricating mandrels and wiper dies during the mandrel bending of round, square and rectangular tubing.If you would like to try this lube and would like to have a free sample, please let us know. Or if you would like to purchase a 5 gal pail of it, let me know. I can also provide you a MSDS if you would like.