Extended modules > Creo Elements/Direct Sheet Metal > Modify a sheet metal part > Modify a bend
  
Modify a bend
Besides other alterations a design modification may include the change of one or several bends. In general, Creo Elements/Direct Sheet Metal allows you to change the radii and the bend processes of bends. You cannot change the radii of hems or offsets using the Modify Bends dialog box. If you wish to increase the bend radius beyond the upper limit of the existing bend reliefs, you must first modify the bend reliefs to accommodate the increased radius.
To modify a bend, click on the bend you want to modify. The bend you select is highlighted (1).
If you try to change the bend radius to a value smaller than the minimum radius, Creo Elements/Direct Sheet Metal prompts you with an advisor message. The minimum radius is defined by the material's minimal radius, the available tools, and the bend process.
To change the bend radius and the bend process,
1. Click Sheet Metal and then, in the Modify Sheet group, click the arrow next to Bend.
2. Click Modify. Creo Elements/Direct Sheet Metal displays the Modify Bends dialog box and prompts you to select a bend to modify.
3. Click a bend of your sheet metal part. Creo Elements/Direct Sheet Metal highlights the bend you have clicked.
4. Specify a face of the sheet (the Base Face or anchor) that is to be held while the other part of the sheet is folded.
5. Depending on where you want the bend to start, click or clear the Centered check box.
6. If necessary, click Angle and enter a new bend angle.
7. If necessary, select the new bend process from the Process selection list. Creo Elements/Direct Sheet Metal displays a table with the available bend radii.
8. Click a row in the table and click Apply. (You can also double-click the table row.) The new radius value appears in the box next to Inner Rad.
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Under New Parameters, click Default to set the parameters back to their default settings or click Current to set the parameters back to the currently-saved values.
9. Click .
Creo Elements/Direct Sheet Metal changes the radius and angle of the bend.
Changing a sharp bend to a defined radius bend
With Creo Elements/Direct Sheet Metal, you can change a sharp bend (zero radius) to a regular Creo Elements/Direct Sheet Metal bend. Sharp bends may be introduced in parts created with Creo Elements/Direct Modeling or other 3D CAD applications and imported into Creo Elements/Direct Modeling.
It may be a good idea to change such sharp bends to defined radius bends.
The anchored face, the bend allowance change, and the centered option
The following figure shows how the bend is modified when L1 is the anchored side and when L2 is the anchored side (the Centered check box is cleared). When L1 is the anchored face, the Bend Allowance Change (C) is adjacent to L2. When L2 is the anchored face, the Bend Allowance Change (C) is adjacent to L1.
Key to figure:
1 — Original bend (B = Bend Allowance length).
2A & 2B — L1 is anchored.
3A & 3B — L2 is anchored.
When the Centered check box is selected, the bend allowance change is distributed equally on both sides of the bend. By default the Centered check box is selected.
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Hems and offsets cannot be modified using the Modify Bends dialog box.