Week 4 - 2D Meshing for Sheet Metal

CHALLENGE WEEK 4: MESHING OF HOOD CCB ASSEMBLY

OBJECTIVE:

To do geometry cleanup and mesh the mid-surfaces for the CCB assembly as per the given quality criteria.

CAD MODEL:

Model of CCB assembly

PROCEDURE:

1. Importing CAD model:

• Open the geometry model. Use Topology option to clear the cons and check the model orientation using Entity Drawing Style in Menubar.

• Check and assign PID and Materials from Lists menu (if required).

2. Geometrical Clean-up:

• Check for geometrical errors using Checks Manager option. Execute the geometry after selecting the required options.

• Clear the errors using auto-fix option in Checks Manager from Tools menu.

• If the errors still persist, then they have to be corrected manually using TOPO options.

• Rerun the geometry check again for zero errors.

3. Creating Mid-surface:

• Check the model thickness at different spots using Measure option in Utilities menu.

• Store the measurement data in Database if required.
• The given model has separate parts with individual thickness as per the measurement data shown above.
• Extraction of mid-surface of the model can be done using Mid-Surface option from Topo menu.

• Assign a new PID and thickness value for the created mid-surface.
• Repeat the above method for each parts given in the assembly model.

• Store Lock the mid-surfaces and parent assembly model view separately.

4. Quality Criteria and Meshing:

• Change the Length Parameter to value 5 for both Perimeter and Macros.

• Select and enter the values required in the Quality Criteria box from Utilities menu.

• Input the required mesh length and minimum length in Mesh Parameters from Utilities menu.

• Select Classical Mesh option from Mesh module.
• Mesh the features sequentially and use Shadow Drawing Style to view the mesh quality deviations.

• Correct the mesh flow and quality using Mesh options.

• For an elevated patterns (beads) on the face, the peak points has be captured properly.

• Defeaturing of certain sections has to be done in order to avoid quality failure of shell elements.

Final Model:

RESULTS:

The given CCB assembly model has been completely meshed maintaining all the quality criteria.