This function allows the user to define single or multiple groups of
lines. These lines are chosen to perform piercing, lancing and/or trimming
operation illustrated in Figure 8.3.97.
Figure 8.3.97 Trimming process
GROUP LIST
Group List lists all the defined group names of the current line. The
user classifies these lines for ease of line management. If multiple line
groups are defined, the latest line group is always highlighted in the
interface as well as on the display screen. The line groups that are not
completely defined are displayed in red.
ADD
Create new line group.
DELETE
Remove selected or current line group. The dialog box illustrated in Figure 8.3.98 is displayed prompting the user to confirm
Delete operation.
Figure 8.3.98 Delete question dialog box
NAME
This function allows the user to modify the name of the current group.
When creating groups, the user can specify a unique name for the new group. The
user may highlight the group Name field to modify the group name by typing the
new name in the input data field of Name, following by press the Enter key to
complete the operation.
ATTRIBUTES
This function allows the user to define line type, trimming mode and
direction, seed, gap, tolerance, etc. The user can select different line type
for definition of different attributes.
TYPE
There are two types of line: Tool cut (2D) and Laser cut (3D), which
correspond to 2D and 3D trimming respectively.
Note: The trimming direction of 2D line is determined according to the defined vector direction; and the trimming direction of 3D line is determined according to the normal direction of element.
MODE
There are three modes of 2D trimming: Trimming, Hole and Lancing. For Trimming
and Hole, the user must select the closed curve. The user can classify these
curves.
DIRECTION
Define trimming direction. Refer to the previous sections for
description about defining direction.
TOLERANCE
Trimming tolerance is used to control the size of elements generated
after trimming operation. If the value is zero, element size is not restricted;
if the value is 0.5, the size of the newly generated element should at least be
half of its parent element; if the value is 1, it is allowed to move the
original node to the trim curve without generating new element after trimming.
If the tolerance value is negative, the user only perform simple trimming, i.e.
deleting the entire element while keeping the serrated boundary. The default
tolerance is 0.25.
SEED
Any node on a trimmed element after
trimming operation can be defined as seed node. If the user selects Point
option, and then selects node or point, the seed will be exported in coordinate
point format. Therefore, the problem of not finding the seed due to mesh
adaptivity will be avoided in the multi-step setup.
GAP
Define the maximum gap between
trim curve and mesh. If the value is greater than a specified gap, the
corresponding segment of trim curve is disabled.
GEOMETRY
This function allows the user to
translate, add and delete lines.
POSITION
Translate the selected trim curve.
The user can input the translation value and click on the distance to be
translated to complete the line translation. There are three input data fields
corresponding to dx, dy and dz values under the current C.S.
ADD
Allow the user to add one or more
trim curves. Click Add button to display the Select Line dialog box. Refer to
the previous sections for information on methods of selecting lines.
DELETE
Remove the selected lines. Select
the lines and click the Delete button to display a dialog box illustrated in Figure 8.3.99.
OK: Confirm the selected line.
CANCEL: Abort the Delete operation.
Figure 8.3.99 Delete line question dialog box