Week 8 - Challenge 2 - Base Bracket Design

DRAFT ANALYSIS OF BASE BRACKET

Draft is the angle that is put on the side faces of the part so that the part doesn’t get trapped in the mold or cast. Here the draft angle is checked on base bracket in CATIA V5.

The Class A surface is provided to us.

Fig 1. Class A Surface

First of all we need to check whether the surface provided has nay discontinuity in it. For that we will use the command boundary and check if there is any discontinuity in the surface.

After that we will join the whole surfaces of the fan cover by using join command.

Fig 2. Join Command

Then we will randomly select the tooling axis. For making the selection first analyse the shape of the product and avoid side cores as far as possible. Here we will take the Z axis as the tooling direction and mark a point there and create a datum axis at that point. We will make a dummy tooling axis in the Z direction.

Fig 3. Dummy Tooling Axis And datum axis is created

Next step is to take the intersect of the Class A Surface and the YZ plane.

Fig 4. Intersect at YZ plane.

Observe the surfaces which are parallel to the dummy tooling axes and which will create a problem while the component will be ejected from the mould. Draw a line through the surfaces.

Fig 5. Extending the parallel surfaces to the dummy tooling axis

Next bisect both the lines and obtain the line that is going in the direction of the dummy tooling axis. That will be the tooling axis in the YZ direction.

Fig 6. Bisecting the lines

Fig 7. Tooling axis in the YZ direction

Next obtain the tooling axis for the XZ direction by following the same steps.

Take the intersect of the Base Bracket and the XZ plane. Identify the faces which are parallel to the dummy tooling axis. Since there are no faces which are parallel to the dummy tooling axis we will create a line superimposing the dummy tooling axis which will be the XZ tooling axis.

Fig 8. Tooling axis in the XZ direction.

Now we have got tolling axis in the XZ and YZ direction. Bisect both the lines and obtain the line which is in the direction of the dummy tooling axis. That is the required tooling axis of the fan cover.

Fig 9. Tooling Axis

Now we have to perform the draft analysis in the required tooling direction.

Change the view to material mode in the customize view parameters.

Fig 10.Material Mode for Draft Analysis

Then insert > analysis > feature draft analysis.

Fig 11.Draft Analysis

Next take the compass and put it over the tooling axis to get the required direction of draft analysis and then lock the draft direction.

Fig 12. Compass over the tooling axis

Then double click on the component and it will show the draft analysis. It is shown according to different colours for different draft angles.

Fig 13. Draft Analysis

Fig 14. Isometric View

Fig 15. Front View

Fig 16. Side View

Draft analysis for Final Solid:

Fig 17. Isometric View

Fig 18. Front View

Fig 19. Side View