The shut-off surface feature inside SOLIDWORKS mold tools is quite useful when dealing with holes in mold cavities.
The shut-off surface feature helps seal these holes when creating the mold cavities of parts with holes. If the holes are complex in shape, then you might be forced to create the shut-off surfaces on your own. If you are lucky enough to have the holes in perfect round shape, then SOLIDWORKS can do this automatically.
Looking at the cup above, if we needed to create a mold cavity from the part, then we would begin by following the procedure to creating the mold cavity, as outlined in the mold tools folder.
We begin by specifying the parting line, then moving to the shut-off surface option. Clicking on the option pulls up the window below in the feature manager tree.
Notice that SOLIDWORKS automatically detects the edges from which the shut-off surfaces can be created. Clicking on the show preview checkbox shows what the shut-off surfaces would look like.
Shut-off surfaces look much like surface fills, but since the surfaces fill work only on surfaces, the shut-off surface feature is better suited to solid bodies.
Clicking on the green marker sets up the shut-off surfaces. Notice also that the shut-off surfaces get added under the surface bodies’ folder. You now have two bodies making up your part: the shut-off surfaces created using the shut-off surface feature and the solid body created by using the extrude surface and extrude cut features.
With this done you can create a mold cavity out of your part.
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