You can create parting lines and parting surfaces to define where
mold volumes are to be split.
• Parting surface creation methods:
– Automatic — Skirt Surface
– Manual — Use surfacing
• Parting line creation methods:
– Automatic — Silhouette Curve
– Manual — Use datum curve
– Only needed for automatic
parting surface creation.
Figure 3 – Parting Surface
Understanding Parting Lines and Parting Surfaces
Once the reference model and workpiece are assembled into the mold model,
it is necessary to begin thinking about where the workpiece will split into the
core and cavity to open the mold. The location where the workpiece splits is
the parting surface. The parting surface is generally perpendicular to the pull
direction and lies between the parting line edges of the reference model and
the outside walls of the workpiece.
There are two different methods that you can use to create the parting
• Automatic — You can utilize the Skirt Surface
surface for you automatically.
tool to create the parting
• Manual — You create the parting surface using basic and advanced
surface creation techniques.
If you create the parting surface automatically using the skirt surface, it is
necessary to first create a parting line. The parting line is a collection of
datum curves that is created on the reference model. You can then use the
parting line to create the skirt surface.
There are two different methods that you can use to create the parting line:
• Automatic — You can utilize the Silhouette Curve
the parting line for you automatically. A silhouette curve is a datum
curve feature that is created where the draft on the reference model
tool to create
instantaneously changes from positive to negative when viewed from
a certain point.
• Manual — You create datum curves using various techniques in order to
create the parting line.
You only need to create a parting line if you will be using the Skirt
tool to create the parting surface.
Parting Surface Criteria
You must remember the following criteria when creating parting surfaces:
• A parting surface must intersect the workpiece or mold volume completely.
You can merge multiple surfaces together.
• A parting surface cannot intersect itself.
• You can use any surface as a parting surface as long as the first two
criteria are met.
• Parting surface features are created at the assembly level in the mold
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