Week 8 - Challenge 4 - Bumper
CLASS A SURFACE:
- Visible surface and aesthetic look.
- Surface with textures.
- Surfaces provided by customer(OEM).
- Don't have any features like(rib, snap, bosses, etc) on class A surface.
- Class A surface is made from scanned data with different software like alias etc.
- Surfaces which are having CURVATURE CONTINUITY IS CALLED class-A.
TOOLING AXIS:
The Tooling Direction is basically the direction that the mold pulls apart. The ejection of the part from mold depends on the draft. A zero draft can result in difficult or no ejection due to shrinkage. It is recommended to add a minimum of 0.5 to 1 degree of the draft for non-textured surface & 3 to 5 degree of draft for textured surfaces. Drafts are only necessary in the direction of pull of mold.
DRAFT ANALYSIS CLASS A SURFACE:
- The Drafting analysis was performed on the class-A surface by using the Feature Draft Analysis command.
- Using this command, the compass was set on the main tooling axis and the Draft angle was changed to 3 degrees.
CLASS B SURFACE:
- Invisible Surfaces.
- Surface mostly don't have textures.
- Surface needs to be created according to the class-A surface.
- Having all features(Rib,boss,snap etc) in B-side surface only.
- Surfaces which is having TANGENT CONTINUITY IS CALLED class-B.
CLASS C SURFACE:
Surface that joins class-A and class-B surfaces is class-C surface. Class C is often specified for interior surfaces not readily visible, surfaces that will be covered by another part when assembled
Since it is a complex class-A surface, we cannot simply create the class-A boundary curve and sweep it at one shot. Hence, we need to create smaller curves using multi-extract command and then create sweep of 90 degree with reference to the surface option. sweeps at the midportion of the bumper should have a 93 degree vaue to pass the draft analysis.
FINAL SURFACE:
CLOSED SURFACE WITH THICKNESS 3 MM:
DRAFT ANALYSIS FINAL SURFACE:
TREE STRUCTURE:
BUMPER VIEWS:
Challenge 4 - Bumper
