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Creating a Skirt Surface

You can use a skirt surface to automatically create the mold model parting surface.
• The skirt surface is created using specified datum curves.
– The silhouette curve parting line is usually selected.
• Inner holes in the reference model are filled using silhouette curve loops.
• Outer curve loops are extended to the workpiece boundaries.

Creating a Skirt Surface

Creating a Skirt Surface 1
Figure 1 – Viewing the Silhouette  Curve Parting Line

Creating a Skirt Surface 2
Figure 2 – Viewing the Completed Skirt Surface
You can create the parting surface for a mold model by using Parting Surface in the Parting Surface & Mold Volume group. The system can help you automatically create a parting surface by using the Skirt Surface tool. This tool helps you automatically create a parting surface by creating a skirt surface.
The parting surface is ultimately used to split the mold model into the mold core and mold cavity. So, you can think of the parting surface as the location of all metal-to-metal contact between the mold core and cavity.
To create the skirt surface you must specify the curves that the system should use. You can specify curves in any of the following ways:
• One By One – This enables you to select individual curves or edges.
• Curve Chain – This enables you to select a chain of curves.
• Feat Curves – This enables you to select all curves that belong to the specified feature.
The skirt surface is usually created by specifying an existing parting line silhouette curve. The silhouette curve is selected using the Feat Curves method of specifying curves. However, if you do not want to use the entire silhouette curve, or if you want to use the silhouette curve in conjunction with other datum curves, you can use the Curve Chain or One By One options.
The Ref Model, Workpiece, and Direction must also be defined to create the skirt surface. However, if the process workflow has been followed, these items should have already been automatically defined for you. The Ref Model is the reference model used in the mold model, the Workpiece is the workpiece used in the mold model, and the Direction is the pull direction of the mold model.
Once you have specified these items, the system classifies each closed loop of curves into one of two types:
• Inner loops – Loops that are filled by the skirt surface.
• Outer loops – Loops that the skirt surface extends outward through.
Usually, the system is able to automatically determine the loop classifications.
Once the classifications are made, the system automatically creates the skirt parting surface feature by doing the following:
• It fills the inner holes (shutoffs) in the reference model using the inner loops from the Silhouette curve or other selected datum curve. In Figure 2, all five interior shutoffs have been filled using loops from the specified silhouette curve.
• It extends the outer loops of the Silhouette curve or other datum curve to the boundaries of the workpiece. In Figure 2, the skirt surface extends out to the boundaries of the workpiece.
Similar to mold volumes, you can rename the parting surface by starting the Parting Surface tool, right-clicking, and selecting Properties, or clicking Properties from the Controls group.

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