How do I bend a tube without getting wrinkles in it

How do I bend a tube without getting wrinkles in it

August 31, 2017

Have you ever tried to run a bend and every time it turns out creased and wrinkled?  Here’s a few ways to fix it.

Bending a tube requires accuracy and precision.  Every detail matters when making a smooth bend.  Choosing the correct size bender, the correct tooling set, and correct style of bender are all important factors.  

Having the right size bender is the first thing to ensure that a smooth bend is produced.    If the bender is too small for the bending need, it will not hold the tube rigidly enough – in turn allowing wrinkles.  It is better for the bender to be oversized than undersized.  

Tooling can also affect how good of a bend is produced.   Using a three, four, or five piece tooling set helps control the tube.  Whether the set includes a bend clamp, wiper die, pressure die or mandrel, each of these pieces of tooling affect the quality of the bend produced.  It is important to choose the correct type of tooling for the material being bent.

A rotary draw style of bender that firmly clamps the material being bent is one of the best options to avoid wrinkles on the bend.  Rotary draw benders form the tube by drawing it around the bend die, usually over a mandrel.  The material is clamped to the bend die, holding the tubing tightly with the clamp, without slippage, to create a smooth high quality bend.

Be sure the tube is closely fitted and has a firm grip in the clamp during the bend, as this is the key to smooth bends!


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