Week 9 - Attachment Feature Creation (Ribs & Screw Boss) - Challenge 1

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

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

CLASS C SURFACE