Week 4 - 2D Meshing for Sheet Metal

AIM:

To extract the manual midsurface of the given CCB CAD model, mesh the component using the given quality parameters and assign thickness.

CAD MODEL IMAGE

Cons resolution by Length option in Mesh module(The Length value for doing the cons resolution is suggested as 1).

1. The imported CCB file is an .igs file it doesn’t have any connectivity between the Surfaces.
2. To get the connectivity between the surfaces we have to use the Topo option.(TOPO Module> Faces > Topo)
3. We have to Orient the Surfaces to make sure all the surfaces are in one normal direction.(TOPO Module> Faces > Orient)

Checking the geometrical errors.

Done Clearing the geometry errors by Auto fix & Manual fix for triple con.

Check the thickness of the components. to decide 2D /3D Mesh.

The thickness is less than 5 or 6mm then we have to extract the midsurface - 2D mesh

the components have the uniform thickness then we will be using the Offset options to extract the midsurface.

We need to go 1 by 1 part to extract & mesh from the entire assembly to avoid complication. (need to maintain seperate Property card for each componenet to give Material thickness accordingly)

MESHING:

After Mid surface - start Mesh from classic mesh window.

Mesh flow of each part need to satisfy Mesh quality creteria.

S.No Quality Criteria Value

1 Target/Average length 5

2 Minimum Length 3

3 Maximum Length 7

4 Aspect 3

5 Warpage 15

6 Skewness 45

7 Jacobian 0.7

8 Minimum Quad Angle 45

9 Maximum Quad Angle 135

10 Minimum Tria Angle 30

11 Maximum Tria Angle 120

10 Tria Percentage 15

If the quality of Mesh creteria passes with requirement (E.g Tria % less than 15%) means - CCB Assembly has ready for solving.

CONCLUSION:

LESSONS LEARNED

1. Learned to make midsurface creation.

2. Transform feature > rotate option, to form copies of the same surface around an axis.

3. Learned to use curves to generate surfaces, be it through manually created curves as well as curves generated with the help of cons.

4. Geomentry cleanup tool & Mesh features.

RESULT

The given CCB Model was meshed as per required quality criteria, after having carried out topology cleanup and generated midsurfaces for each of its parts and thickness was assigned to each of them.