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Question:    Why are my parts a little long here and a little short there?

Answer:      Spring back is a commonly known phenomenon in the tube bending industry. Spring back is the result of the material “memory” wanting to go back into its defined position. As a result, you must over bend the material to achieve your desired angle. This is where our issue comes into place. As you are releasing the pressure on the material (the material is springing back), the radius is becomes larger.  To have accurate parts we simply need to engineer to our achieved center line radius and to the amount of material that is used in the bending zone.

Each material will have its own spring back characteristics. Aluminum will have a different spring back then stainless steel, hence, the radius achieved will be different between these two metals. In addition, different diameters of a material and different sizes of dies will spring back different amounts.

If we look at an example where we would like to achieve a 90-degree bend we may need to bend the material to 95 degrees. While you are releasing the pressure of the shoe the material will push back onto the shoe. This is increasing the radius size compared to the machined die. The same amount of material used to bend the material 95 degrees is located in the bend of the finished 90-degree bend. The extra 5 degrees of material is what is increasing the radius.

Bend-Tech EZ-3D provides you with an easy to use calibration interface.  Follow steps 1 to 4 and Bend-Tech EZ-3D will automatically update your tooling.  

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Last modified: March 06, 2005