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Copper unfold: Principle

An unfold is a 2D representation of a copper item viewed from above in the state prior to mechanical bending. Unfolds are placed on graphical pages. For each unfold, only one item is represented. Since the copper items processed in EPLAN Pro Panel have a constant rectangular cross-section, an unfold will always display a rectangle as the outer outline.

In addition to the display of the outer form, the unfold contains information on the bending positions. For this purpose, bending lines and bending extents are displayed. Furthermore, the bending positions contain information on the bending angle and the direction of the bending.

In the case of upright bending, an arrow at the bending line indicates the side of the busbar where it is to be bent upright.

The resulting unfolds - similar to the model views - can be dimensioned and labeled subsequently. The unfold is, thus, the manufacturing basis for the bending machine that processes the copper item further. The manufacturing data on the machining of copper items grab the information contained in the unfold and, thus, control the manufacturing on the NC machine.

Unfolds can be edited and modified with the same functions as model views:

Unfolded total length

As soon as a copper item is placed in the layout space, the unfolded total length of the copper item is determined according to internally set rules. The calculated unfolded total length is entered in the part reference data of the part placement in the same way it is done for a channel. With each modification to the item (length or angle change), the total length is updated. The unfold is calculated from the unfolded total length and the adjustment values defined in the settings in the bending table.

If the bending table does not contain the material thickness of a copper item with the relevant bending radii and bending angles, the total length cannot be calculated. This state is displayed in the properties of the busbar on the Bending positions tab in the Status field. After adjusting the bending angle or adjusting the bending table, the Update part placement function should be executed for the respective item. Subsequently, the total length is re-calculated and entered in the part reference data of the item.

See also