Shut-Off Surface Fill Types
A shut-off
surface closes up a through hole by creating a surface patch
along a parting line or edges that form a continuous loop. You can create
shut-off surfaces before or after you create parting lines in a model.
Control the curvature of patches
by selecting different fill types (Contact,
Tangent, or No
Fill).
Click a callout
to change a the fill type of a loop from Contact
to Tangent to No
Fill.
Contact.
Creates a surface within the selected boundary. This is the default type
of surface fill for all loops selected automatically.
Tangent.
Creates a surface within the selected boundary, but maintains the tangency
of the patch to adjacent faces. Click the arrow to change which faces
are used for tangency.
1-
Tangent to the walls of the hole:
2
- Tangent to the surface that the hole penetrates:
In addition to simple loops, use Tangent
for more complex through holes, where the software collects pairs of edges
and constructs and knits together a series of planar surfaces, as shown.
|
|
|
Complex through hole. |
Shut-off surface patch tangent to the walls of the hole. |
Shut-off surface patch tangent to the surface that the hole penetrates. |
No-Fill.
Does not create a surface (the through hole is not patched). This option
informs the SolidWorks application to ignore these edges when determining
if the core and the cavity are separable.
To separate the tooling block into two pieces, you need two complete
surfaces (a core surface and a cavity surface) without any through holes.
Ideally, the Shut-off Surfaces
tool automatically identifies and fills all the through holes. Occasionally,
the software cannot generate a surface for a particular through hole.
In that case, you need to identify the through hole by selecting a loop
of edges and selecting the No Fill
option. After you close the Shut-Off
Surfaces PropertyManager, you create the surface patch manually.
The following SolidWorks tools and capabilities are useful when patching
through holes manually:
Only one Shut-Off
Surface feature is allowed in a model. Therefore, within the one
feature, you must assign a fill type of Contact,
Tangent, or No
Fill to every through hole.