Understanding how it works & its applications

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About Non Mandrel Bending

Nonmandrel bending’s primary objective is to bend tubing that would normally require some form of internal support without using that support.

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Bending Tube without a Mandrel

Nonmandrel bending saw its greatest advancement in the late 1980s and early 1990s with the completely automated computer numerical-controlled (CNC) bending machines.

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Effects On The Tube Structure

he first area to consider is wall thinning. In a mandrel bend, the neutral axis is typically about one-third of the way outward of the inside radius.

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Non Mandrel Tooling

The clamp die will remain unchanged from a round set of tools; that means that it will have a properly-sized round tube groove transversing the entire length.

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Successfully Operating Non Mandrel Tooling

Because the tube is being resized and reshaped during the nonmandrel bending process, tool alignment is a consideration that is just as important as it is in, for example, thin-walled tube mandrel tooling.

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Machine Requirements For Nonmandrel Tooling

To use nonmandrel bending successfully, machine function and rigidity must be considered. The most widely used form of machine is the CNC rotary draw bender.

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Appropriate Applications

It is now time to examine how to calculate the feasibility of nonmandrel bending and apply that calculation to specific applications.

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Limitations Of Nonmandrel Tooling

It is now possible to look a little deeper into the limits of nonmandrel bending and expose some of the possible pitfalls.

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Production Cost

One factor affecting production cost in nonmandrel bending is the tooling. Generally, nonmandrel tooling is easier to set up, thus providing quicker changeover.

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