Week 9 - Attachment Feature Creation - Challenge 2
AIM
Create the component through the given Class-A surface. the tooling axis for the given Class-A Surface should be created meeting the requirements of the draft angle and at the end perform the Draft analysis on the model. Create the Dog House for the Door Trim considering the design rules
CLASS A SURFACE
In automotive design, a class A surface is any of a set of free form surfaces of high efficiency and quality. It gives the aesthetic of the component which is created by the styling team and gives to the part design engineer to create the part with all engineering aspects.
CREATING THE CLASS A SURFACE
We have been given the Class-A surface and the first thing to do is to make sure that the given surface has no gap in between them. We can check it visually and also with help of Join or boundary commands.
TOOLING AXIS
TOOLING AXIS is created by bisecting the axis created on two intersections .
the best tooling direction for the class-A surface is along y-axis direction.
Flat surface on the center part is extracted for creating the tooling axis in y direction
Then created a with the point and direction along y axis.
TOOLING AXIS of the part is created
DRAFT ANGLE
When developing parts for plastic injection molding, applying a draft (or a taper) to the faces of the part is critical to improving the moldability of your part. Without it, parts run the risk of poor cosmetic finishes and may bend, break, or warp due to molding stresses caused by plastic cooling. Equally important, an absence of draft may prevent parts from ejecting from the mold, damaging not only the parts but possibly the mold itself—a costly and time-consuming detour.
DRAFT ANALYSIS OF CLASS A SURFACE
Change the view to material mode for draft anlysis
draft analysis is done using featured draft analysis tool
Use the compass fucnction to aling the compass to the tooling direction and lock the direction using lock function in the draft analysis tool bar
the surface is showing green colour so that the surface clears the minimum draft angle of 3 degree
By using the analyses under the running pointwe can check draft angle on the individual faces. It shows how much draft on specific points when we move the cursor point.
Green colour - above 3 degree positive draft
Red colour -between 3 and 0
blue colour- below 0 degree
CLASS B SURFACE
Class-B surface means the thickness of a part it is not visible and is inside part. In other words, the Class-B surface is a surface below a certain thickness from the class-A surface. This is the surface that contains engineering aspects of a model.The Class B finish is a quality finish with only minimal imperfections. A Class B finish is the most common finish for exterior surfaces. It is normally specified on surfaces such as external covers, panels, and parts that are fairly prominent.
B SURFACE is created by Offseting the class-A surface to 3mm inward direction.
patches are created while offsetting the surface. Rework on the patches using the features like extract, multi-extract, sweep, multi-section surfaces, extrapolate.
the boundary command is used to identify and highlight the patches
CLASS B SURFACE IS CREATED
The surface that joins class-A and class-B surfaces are class-C surfaces. Class C is often specified for interior surfaces not readily visible, surfaces that will be covered by another part when assembledThe Class C finish allows more imperfections than Class A or B. Class C is often specified for interior surfaces not readily visible, surfaces that will be covered by another part when assembled, or surfaces which the Customer feels do not need to meet a high cosmetic finish.
The method used for class c surface is sweep feature
Since it is a complex class-A surface, we cannot create the class-A boundary curve and sweep in a single stretch .
small sections are created using multi-extract command and then create sweep of 90 degree with reference to the surface option.
SOLID SURFACE
CLASS A and CLASS C is JOIN together
CLASS B is trimmed with CLASS A AND C
SOLID SURFACE FORMED
TREE STRUCTURE
PART BODY
Close Surface feature usedto make a solid body from the surface
DOG HOUSE
"C" is where the doghouse contacts the backside of the surface
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Doghouse wall thickness at the intersection of the part wall ( C ) should be 40% or less than the main wall stock ( T ).
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The height of ( B ) should be between 3.0 – 6.0 mm
Surface is extraced and point is created
sketch
sweep in draft drection
surface is created
thicken to form solid
SIDE CORE TOOLINGAXIS CREATED
inside dratf provided
Doghouse wall at the intersection of the part wall
surface created according to design rules
trimmed with dog house body
draft provided at lower portion
the body copied translated from point to point tocreate doghouse at second point
assembled to part body
component is formed
DRAFT ANALYSISOF COMPONENT
Change the view to material mode for draft anlysis
draft analysis is done using featured draft analysis tool
Use the compass fucnction to aling the compass to the tooling direction and lock the direction using lock function in the draft analysis tool bar
the surface is showing green colour so that the surface clears the minimum draft angle of 3 degree
By using the analyses under the running pointwe can check draft angle on the individual faces. It shows how much draft on specific points when we move the cursor point.
side core tooling axis
Green colour - above 3 degree positive draft
Red colour -between 3 and 0
blue colour- below 0 degree
CONCLUSION
- TOOLING AXIS for the CLASS A SURFACE and MODEL is created
- CLASS B AND CLASS C surfaceis created from CLASS A surface
- SURFACE MODEL is created using CLASS A,B & C surface
- SOLID BODY is created from SURFACE MODEL using close surface
- DOG HOUSE are created considering the design rules
- DRAFT ANALYSIS is done on CLASS A SURFACE and SOLID BODY
- Publications: Use the publication option published the following
- Tooling Axis
- side core axis
- Class A, B, and C surface
- SURFACE MODEL
- SOLID BODY