Since commercial sheet metal bending can be done with less concern for stresses caused during forming operation the radius can be near zero for thin sheet metal.
Relief ratio sheet metal.
The higher the value the larger the size of the relief cut added during insertion of bends.
The value of the relief ratio must be between 0 05 and 2 0.
Quick video about bend radius watch more tech tip videos bend radii minimum bend sizes.
6 shows when the ratio to thickness is used in a obround relief the width ratio has more influence on the shape of the relief than the length ratio.
Enter relief size by bend radius ratio or force bend reliefs.
When sheet metal makes a transition from a bend to a flat surface or to another bend it tends to rip and tear.
For a 3 width ratio when the part is 1 mm in thickness the width of the slot will be 3 mm.
The minimum bend radius data shown in these charts is measured to the inside of the bend.
Select a hard edge bend face flange face or 3d solid entire model.
In the propertymanager under auto relief change the type of relief cut.
The value of the relief ratio must be between 0 05 and 2 0.
Click the create relief tool button on the sheet metal ribbon tab.
Examples of i tear.
In general a minimum bend relief is equal to the material thickness plus the inside bend radius.
If you select rectangular or obround specify the relief ratio.
This check computes inside bend radius and checks the ratio of bend radius to sheet thickness.
Bend radii minimum bend sizes.
Ratios are configured for the hard material condition.
Once the base flange feature is created this setting will be.
User can configure the ratio based on the material.
To eliminate this a bend relief is added so the edge of the sheet metal is perpendicular to the bend.
3d cad files are converted into machine code which controls a machine to precisely cut and form the sheets into the final part.
Protocase tech tip video.
The higher the value the larger the size of the relief cut added during insertion of bends.
The bend radii listed are standard minimum if manufacturing for aircraft and aerospace applications.
7 only affects the relief within a narrow margin.
It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii.
Do one of the following.
Sheet metal fabrication is the process of forming parts from a metal sheet by punching cutting stamping and bending.
When sheet metal makes a transition from a bend to a flat surface or to another bend it tends to tear depending on the geometry.
Select an item see the note below.
Right click the sheet metal feature in the featuremanager design tree and select edit feature.
Choose create relief in the sheet metal menu.
The length ratio 3 2 fig.
