About Corner Relief
Use the Corner Relief tool to add relief to one or more corners of a sheet metal part. When you add relief, sheet metal sections are removed from the model. You can apply corner relief automatically to all corners or manually to individual sets of corners. Relief helps to control sheet metal material behavior and to prevent unwanted deformation during unbend operations. You can define corner relief settings during feature creation, or you can predefine them in the Relief area of the Sheetmetal Preferences dialog box or using sheet metal parameters.
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You can also add corner relief when creating a flange wall or a conversion feature.
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Keep in mind the following points when creating corner relief:
• To display corner relief notes, click > 
, or click on the Graphics toolbar. Make sure that 
Annotation Display is activated and that the smt_crn_rel_display is set to yes.
, or click on the Graphics toolbar. Make sure that Annotation Display is activated and that the smt_crn_rel_display is set to yes.• The model must have at least one ripped edge in order to add corner relief.
• You can display corner relief in a model in both the formed and the unbent states.
• Corner relief dimensions must be smaller than the deformation area bordered by the tangent lines of the intersecting bends.
• The flat pattern displays the corner relief as set in the Relief area of the Sheetmetal Preferences dialog box. When you use the Corner Relief, Flange, or Conversion tools to create feature-specific relief, then the flat pattern displays the relief as you set it using the tools.
Tangent to Bend in Legacy Designs
From Creo Parametric 5.0 release, the depth option Tangent to Bend in not available. When you open legacy models created in Creo Parametric release 4.0 and previous releases in Creo Parametric 5.0 the Tangent to Bend depth option is replace by the On Origin depth option. When the Tangent to Bend depth option is used in a relation, the relation is maintained, but the result produced will be the same as using the On Origin depth option. When Tangent to Bend is used in a relation, it will display in the Parameters dialog box.