Progettazione di stampi e colata > Working with Parting Surfaces > Using Shadow Surfaces to Create Parting Surfaces > To Use a Shadow Surface to Create a Parting Surface
  
To Use a Shadow Surface to Create a Parting Surface
You must unblank the work piece or die block to proceed.
1. Perform one of the following actions:
In Mold:
1. Click Parting Surface. The Parting Surface tab opens.
2. Click Surfacing > Shadow Surface.
In Cast, click Parting Surface Design > Shadow Surface.
The Shadow Surface dialog box opens.
2. Specify the shadow parts. You can select either single or multiple reference models. If there is only one reference model, it is selected by default.
3. If there are multiple reference models, the FEATURE REFS menu appears. Select the reference models you want to use. If many reference parts are selected, you must select a shut off plane.
4. Click Done/Return.
5. Specify the workpiece or die block component. If there is only one workpiece or die block in the assembly, the system selects that component by default.
6. Define the direction for the light source. Click one of the following commands from the GEN SEL DIR menu:
Plane—Use a plane normal to the direction.
Crv/Edg/Axis—Use a curve, edge, or axis as the direction.
Csys—Use an axis of the coordinate system as the direction.
7. The system displays an arrow, along with the DIRECTION menu. Click Flip and Okay or just Okay.
8. If you want to use a datum plane to control the shadow clipping (the system does not copy surfaces from the clip plane downward in the direction of the light source), select Clip Plane from the Shadow Surface dialog box.
9. If you want to define the loop closure and cap plane for any loops in the preliminary shadow surface, select Loop Closure from the Shadow Surface dialog box. The system extends the loops up to the cap plane.
If the shadow feature contains multiple inner loops, the system opens the GATHER FILL menu with the following commands:
Cap Plane—Specify a plane to seal off or enclose the mold volume. This option is selected by default.
All Inner Lps—Seal the openings of all inner loops in a selected surface. This option is selected by default.
Sel Loops—Seal the openings of selected holes in a selected surface.
The system assumes that on any given part, the area of most change occurs on the inner loops, and that all inner loops are closed to the same extension.
10. If you have defined a ShutOff plane and want to extend the shadow surface beyond the edges of the reference model before it drops down to the ShutOff plane, select ShutOff Ext from the Shadow Surface dialog box. The SHUTOFF EXT menu appears.
This process is known as general loop offset and is similar to the sketcher loop offset. However, the result must always be a surface defined by the closed loop from the original shadow curve.
Select ShutOff Dist and then enter a positive value to extend each edge of the shadow surface the same distance from the reference model.
Select Boundary to define each edge of the shadow surface. The system opens the SHADOW BOUND menu.
Click Sketch to sketch a boundary for the surface extension.
Click Select to select a closed loop of edges for the surface extension.
The CHAIN menu appears with the following commands:
One By One (default)—Select individual curves or edges.
Tangnt Chain—Select a chain of tangent edges.
Curve Chain—Select a chain of tangent curves.
Bndry Chain—Select a chain of one-sided edges that belong to the same surface list.
Surf Chain—Select a chain of surfaces.
Intent Chain—Select an intent chain.
The system allows you to select or create a boundary loop, which should be perpendicular to the pull direction.
11. If you want to specify the draft angle of the transitional surface between the shutoff extension and the shutoff plane, select Draft Angle from the Shadow Surface dialog box. A draft angle of 0.0 degrees is the default value.
12. If you want to specify how far to extend the drafted surface, select ShutOff Plane from the Shadow Surface dialog box. By default, the system extends the shadow surface to the inside perimeter of the selected workpiece or die block. In the case of multiple workpieces or die blocks and multiple reference models, this is a required field.
13. Click OK. The system regenerates the shadow surface feature.
14. Click Preview to preview the feature geometry. The shadow surface appears in magenta.
15. Click Done/Return.