- Manual impeller manufacturing in NX CAM
- Manual impeller manufacturing, 3 axis roughing in NX CAM
- Manual impeller manufacturing in NX CAM, 5 axis (semi)finish
- Manual impeller manufacturing in NX CAM, 4 axis mill-turn
This instruction shows the process for creating roughing operations for an impeller (as a part of impeller manufacturing series). It can work as a training material for 3 axis manufacturing.
Reasons for manual 3 axis.
During my tests in impeller manufacturing, manual roughing operations have shown better performance compared to 5 axis. The difference in performance decreases, when areas to manufacture are difficult to reach from one position. In that case a combination of 3 axis and 5-axis (NX-turbomachinery) looks like an optimal choice. The main point in performing the 3 axis operations are axis position and cutting zone limitation.
3 axis operation from top.
First of all, check how much material can be removed using cavity mill operation with the tool axis parallel to impeller rotation axis. Some blade geometries allow removing a large amount of material with a large-diameter tool.
Defining the views.
Next thing would be to “catch” the view in the position, when you can see more material removed (usually a position when you can see most of bottom surface). You may require making two views for two operations, like on the example bellow (the material for removal is surrounded with lines).
Save both of the views in the part navigator (in this example they are named: cavity 1, cavity 2).
Removing material between blades.
- Set the view to the first cavity operation (do not rotate it after this)
- Create a new Cavity mill operation
- Define the trim boundaries in the following way:
- Define the tool axis to be perpendicular to current view
- Set the operation to use InProcess workpiece
- Generate the operation
Removing material between blades, second operation.
Repeat the actions for the second operation
- Use second view for Cavity 2
- Example of boundaries definition:
Video instructions for impeller manufacturing.
Before creating a NX turbomachinery operation, consider checking manual operations. It can save some production time.
Let me know what you think. Have you used any methodologies for optimizing production time for CAM operations?