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Sprue

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The sprue is the extension of the injection nozzle into the mold. In a single cavity mold with a single injection location, the sprue can meet at the cavity wall. The sprue is usually connected to a runner system as shown in the following diagram.

File:Simulation_Moldflow/enu/2012/Help/1Adviser/105_Modeling/150_Feed_System/130_Sprue/sprue2.png

The angle of the taper on a sprue should be large enough for it to be easily ejected, but not too large because the cooling time and the required amount of material increases along with the size of the sprue diameter.

Procedures

Setting default sprue properties

Click (Geometry tab > Properties panel > Defaults > Sprue Properties).
In the Sprue type drop-down list, select the desired sprue type.
In the Sprue shape drop-down list, select the desired sprue shape.
Note: Information about each sprue is displayed in the Description section, as they are selected.
Enter a value for each sprue attribute corresponding to the sprue shape you selected.
Click OK to save and close the dialog.

Connecting the sprue directly to the cavity

Open a model, insert an injection location, and make sure you are in Single Cavity mode.
Click (Geometry tab > Mold panel > Set Parting Plane).
Click the injection cone. This will move the parting plane so that it runs through the point at which the injection location enters the cavity.
Increase the Z depth plane value about 1 to 2 mm, then click OK.
Click (Geometry tab > Properties panel > Defaults > Sprue Properties) from the drop-down list.
Define the sprue, then click (Geometry tab > Properties panel > Defaults > Gate Properties), and make sure the gate Start Diameter (1) is equal to the sprue Diameter (1). Click OK.
Select the Front View plane on the ViewCube to orientate the model so that you can see the injection point.
Click (Geometry tab > Feed System panel > Sprue). The Create Sprue dialog appears.
Click above the injection cone to position the sprue, and then click OK.
Note: To align the sprue with the injection point, it may be necessary to deselect the Snap to grid option.
Click Object Visibility then select Runner System. This will make it easier to add the gate.
Select the Bottom View plane on the ViewCube to orientate the model so that the injection point and the bottom of the sprue are both visible.
Tip: If necessary, click Zoom window on the Navigation Bar and drag a box over this area to get a clearer view.
Click (Geometry tab > Feed System panel > Gate).
Select an injection point from the Select drop-down list.
Select the Defined by coordinate checkbox.
Place your cursor in the model pane, and click at the bottom of the sprue to connect the injection location to the sprue. The sprue coordinates will appear in the Create gate dialog.
Tip: You also enter the relative or absolute coordinates.
Click OK to save and close the dialog

Sprue creation - no gates specified

Click (Geometry tab > Feed System panel > Runner Wizard). The mold moves to the Front view, the modeling grid is displayed, and the sprue location is shown in the default position.
To define the sprue location, either:
- Click the modeling grid at the location of the sprue. You can re-select the position until you are satisfied with the location.
- Enter X and Y coordinates from the origin.
- Click the Middle of the Mold button. The sprue location will snap to the middle of the mold.
In the Sprue Properties section, click Browse to set the type, shape and diameter of the sprue, and then click OK to apply the changes and close the dialog.
If necessary, deselect the Create runners and/or Create gates checkbox, and then click OK to create the runner system.
Note: If you deselect the Create runners and/or Create gates checkbox, you will have to add the rest of the runner system manually. Deselecting the Create gates checkbox automatically deselects the Create runnersoption.
Click Close to close the dialog.

Note: If you decide to change the location of your sprue, repeat steps 1–5. However, repeating these steps deletes the sprue, runners and gates previously created.

Sprue creation - gates specified

Click (Geometry tab > Feed System panel > Sprue). The mold moves to the Front view, the modeling grid is displayed, and the sprue location is shown in the default position.
To define the sprue location, either:
- Click the modeling grid at the location of the sprue. You can re-select the position until you are satisfied with the location.
- Enter X and Y coordinates from the origin.
- Click the Middle of the Mold button. The sprue location will snap to the middle of the mold.
In the Sprue Properties section, click Browse to set the type, shape and diameter of the sprue, and then click OK to apply the changes and close the dialog.
If necessary, select the Display Grid and/or Snap to grid options.
Tip: Use the Grid Defaults button to change the grid properties.
Click Apply to create the sprue, and then close the dialog.
Create runners to connect the sprue and gate(s).

Changing sprue properties

Click Select to change to selection mode.
Double-click the sprue to display the sprue properties in the Tools pane. The sprue color changes to red when selected.
Use the Sprue Properties dialog to change the sprue properties. The changes you make will only affect this sprue.
Click Apply and view your changes.

References

Create Sprue dialog

Set the drop point coordinates, the sprue properties, and location on the grid.

To access this dialog, click (Geometry tab > Feed System panel > Sprue).

Note: The Runner tools are not available for a Part Only mold type.

The drop point (sprue location) is the place for the melted plastic to enter the mold.

You can select the drop point by clicking on the display and entering distances in the X and Y boxes, or by clicking the Middle of the mold button.

The Sprue properties group allows you to set the default length, size and shape of the sprue to be modeled for your part.

Note: If you use this tool to change the sprue properties before you create the sprue, it will have the new properties. The properties of an existing sprue will not change unless you select the sprue, right-click on it, select Properties and change the sprue properties in the dialog that appears.

Sprue Properties dialog - Default

To access this dialog, click (Geometry tab > Properties panel > Defaults > Sprue Properties).

Note: The available modeling tools depend on the mold type you selected.

The Sprue Properties dialog allows you to set the default type, shape and size of the sprue to be modeled for your part.

Note: The default values for a hot or cold sprue with the same shape can be set independently.

If you change the properties of the sprue here, every new sprue will have these properties. The properties of existing sprues will not change. You can override these defaults when you create or edit a sprue.

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	Size	Date	Attached by
gate_properties_16.png No description	53.76 kB	23:26, 3 Jun 2012	contentconnector	Actions Attach new version Edit description Move/rename Delete
object_visibility_16.png No description	57.78 kB	23:26, 3 Jun 2012	contentconnector	Actions Attach new version Edit description Move/rename Delete
set_partingplane_16.png No description	54.15 kB	23:26, 3 Jun 2012	contentconnector	Actions Attach new version Edit description Move/rename Delete
sprue2.png No description	9.66 kB	23:26, 3 Jun 2012	contentconnector	Actions Attach new version Edit description Move/rename Delete
sprue_properties_16.png No description	51.87 kB	23:26, 3 Jun 2012	contentconnector	Actions Attach new version Edit description Move/rename Delete

Simulation Moldflow