12. BUMPER DESIGN IN CATIA

BUMPER DESIGN

METHODOLOGY:

In this model we have focused on the following things:

1. Tooling axis

2. Draft analysis

3. Class-B surface

4. Class-C surface

5. Making a solid model from surface.

The following tools were used to reach the final step:

Extract

Un-trim

Trim

Extrapolate

Offset

Edge fillet

Boundary

Sweep

Join

Intersection

Close (part design)

TOOLING DIRECTION:

First we analyze the model and then choose dummy axis in x and y direction.

As we intersected to proceed we observed that the side walls are not given any draft.

Hence we assume the axis normal to the base surface and parallel to side walls. This surely will create problems because

a minimum draft has to be provided.

Now we go to insert< analysis< draft analysis and follow usual procedure to do the analysis.

Align the compass and click on the surface and as expected the model is mostly in red color i.e. negative draft with

respect to the axis.

To correct it to as best as we can we moved the compass a bit till we got most of the surfaces in green and lock that position.

After hitting ok, we change the direction of the line from z axis to compass direction. The axis will align itself accordingly.

FOR DRAFT ANALYSIS:

CLASS-B SURFACE

For Class B we did Offset by 3mm backside of the Class A

We have divided the entire model into base, side walls, inside side walls and outer flange

and worked on them one by one

Everywhere we follow same procedure

i.e. extract, un-trim, extrapolate, trim and offset.

First base, then side walls. To avoid confusion, we trimmed both together and made them one.

Also the fillet was given. In which radius is reduced by 3mm as thickness of our component is 3mm

FOR CLASS-C SURFACES

In this model, unlike the earlier models, we have used parallel tooling axis.

Hence we cannot use ‘with draft direction’ option under

sweep. So we used "sweep with surface as reference"

The C surfaces will mostly be created like shown below.

FOR FINAL MODEL

Join class-A and class-C surfaces together.

Then Trim class-B surface to them.

FINAL SOLID BODY