Week 10 - Challenge 1- Attachment Feature Creation (Ribs & Screw Boss)
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 rib and screw boss as by 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.
CLASS B SURFACE
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
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.
