Week 8 - Challenge 4 - Bumper
BUMPER DESIGN
OBJECTIVE
The main objective of this challenge is to create a solid body of 'Bumper' with the help of the closed surface method by using the 'Generative
shape design' workbench in CATIA V5. Performing the 'Draft Analysis' on the solid part body of the Bumper.
Overview
Initially, we need to offset the given Bumper class A surface in the inner direction to the required thickness (here the thickness is 3mm). After
we need to close the patches on the offset surface of the bumper, the patches are formed due to the fillets on the Class A surface. Once all the
patches are closed properly join them together to make a proper class B surface and now sweep the boundary of the class A surface to trim with
the class B surface to make a closed body. By using the closed body command in the Prat workbench we can get the solid body from the closed
surface of the Bumper. Now, again went back to the surface workbench to perform the 'Draft analysis' for the solid body.
TOOLING AXIS
To create the tooling axis, I extracted a surface from class A and created a point in the middle of the surface by using the point command and
created a line at that point through the x-axis. Now, I performed a draft analysis check from that line whether the created tooling axis is in the
correct position or not. If, in the draft analysis check the surface highlighted with green colour on both sides of the surface the tooling axis is in the
correct position and direction.
CLASS B SURFACE:
To create the class B surface, offset the class A surface inside as per our thickness requirement (here the thickness is 3mm, so I offset the class A
to 3mm inside). Once the offset is created, we can observe some patches on the offset surface by taking the boundary for the offset surface, those
patches are formed due to the fillets on the class A surface. We need to cover those patches with the help of the multi-section surfaces command
by extracting the patch boundaries. Once all the patches on the offset are covered properly join all the patches with the offset surface, to get the
replicated surface of the class A surface.
BEFORE PATCHING
AFTER PATCHING
CLASS C SURFACE:
To create the class C surface concerning the boundary of the class A surface, I used the sweep command. Initially, I extracted the boundary of the
class A surface with tangent continuity, and I sweep the extracted boundary concerning the surface at 93deg (for draft angle) for 4mm to intersect
properly with the class B surface. Once we sweep all the surface boundaries of class A, extrapolate the sweeped surfaces until both surfaces got
intersected properly, and trim them to remove extended extrapolated surfaces to get a proper sweep boundary throughout the entire surface,
including the centre hole of the bumper.
Now, join both class A and sweep boundary to get the complete class C surface.
Now, unhide the class B and class C surfaces. Check whether all the sides of class B and Class C surfaces are intersecting properly with each other,
to get a closed surface by trimming class B and class C surfaces. If the class B and class C sides are not intersected properly, we need to
extrapolate the sides of the class B surface which are not intersecting with the class C surface. Now, check class B and class C surface boundaries
whether all the sides are intersecting or not with each other. Once the surfaces are intersecting properly trim them together to get a closed
surface.
CLOSED SURFACE
By joining a and b surfaces using close surface option we get a closed surface.
DRAFT ANALYSIS
TREE STRUCTURE
3D VIEWS OF SURFACE
ISOMETRIC VIEW
FRONT VIEW
SIDE VIEW
TOP VIEW
CONCLUSION
The main objective of this challenge is to create a solid body of 'Bumper' with the help of the closed surface method by using the 'Generative
shape design' workbench in CATIA V5. Performing the 'Draft Analysis' on the solid part body of the Bumper.This objective is done.