Unbending process

This command forces the unfolding method which will be used to calculate the unrolled length of a bend.

Creation stages / Use:

Click the icon or select the Unfolding > Unbending process... (from Unfolding document) or Sheet Metal > Unbending process... (from Part document) command from the drop-down menu.

Select the internal or external face of a bend.
Select on of the 3 proposed unfolding methods:

- Definition of the unbending method by imposing of Method, factor K and Correction parameters (refer to Unfolding rule for more details).
- Definition of unbending type (Not specified, Air coining, Coining, Hem bend, Dimpling, Rolling ...).
- Definition of the tool used (by its description).

Validate the unbending process with the button.

In the operations tree, the Unbending processes operations are automatically inserted before the part unfolding operation.

Available Options:

Rolling/Breaking:

It is possible to define rules for rolling / breaking to use for this unfolding.

Limit bending radius: It is the value from which the bend will be rolled or broken.
Rolling:
- Approximation tolerance: It is the rolling approximation accuracy. The 0.1mm is a good value for most cases.
Breaking:
- Number of bending lines: The number of bending lines can be forced. Generally, it is a odd number.
- Automatic number : By checking this option, the number of bending lines it not taken into account, but it will be automatically calculated regarding the entered spacing. The spacing is define between 2 bend centers.
- Intermediate bending lines: Allows to add Intermediate bending lines.
- Alternate Intermediate bending lines: This option is only available if the Intermediate bending lines option is checked.
- The internal bending radius of breaking bends can be forced by entering a value or can be equal to thickness by checking this option.

By using the Breaking option:

It allows you to quickly force the breaking when flattening a transition shape (hopper), for example.

By using the Rolling option:

It also allows you to unroll a tube by force (so that the cylindrical part is not treated as a bend).

It is possible to apply Local unbending process in Part document. It must be essentially used to parameterize rules for rolling / braking in the generic document of Family.

If local unbending process is applied on a bend in the Part document and in the Unfolding document, the operation will be invalid in the Unfolding document.