Roof Design

 INTRODUCTION:

The roof of a car or other vehicle is the top part of it, which protects passengers or goods from the weather. the roof also protect the passengers from any injury when the car gets crashed or is rolled over or something heavy falls on the roof.

METHODOLOGY:

We get the ,model of the roof from the syling team. then we will have to do all the engineering work. we create the ditch area for the roof and also the bow roof and roof rails for the roof wich would we designed by us considering all the safety norms and regulations. 

DESCRIPTION:

DESIGN CONSIDERATION-

1. Visibility criteria
2. Head clearance
3. Curvature study
4. Hear Distortion and snow load criteria
5. Draft analysis

Components of Roof:

1) Front Roof Rail:

The front roof rail is located on the front of the roof where the wind shield joins the roof. The visibility criteria and the head room clearance of the passenger are taken into consideration for the bottom flange. one end of the rail is joined using spot welding while the other end is joined with the roof using mastic sealants for increased strength.

2) Bow Roof Rail 1:

Bow roof is am additional siffening member for the roof to increase the strength and so that it acn satisfy the norms. Both the ends are joined together using mastic sealants to increase strength and also since this would not affect the styling of the roof.

3) Center Roof rail:

Center roof rail or the reinforcement center is located at the center of the roof. the cross section of this is more since it needs to provide more strength to the roof. Here both are ends joined together using mastic sealants.

4) Bow Roof 2:

This bow roof also have the purpose as bow roof 1. this onbe is located between the center roof rail and rear roof rail.

5) Rear Roof Rail:

This roof rail joins with the back door and the roof. inputs from the back door are taken into consideration for designing this roof rail.

 Here one end is joined using spot welding while the other end is joining usig mastic sealants.

Ditch area

We also ctreaed Ditch area. It is extended portion of the main roof concealed by other BIW panels.

 Draft analysis:

Before we give the part for manufacturing we have to some analysis ourself to check all the constraints and to check if we have any negative draft on a part .

We have a tool called draft analysis in NX Cad to check the following.

Rear Roof Rail.

Roof outer Pannel:

Front Roof Rai:

Bow Roof Rail 1:

Center Roof rail:

Bow Roof Rail 2:

We gave a limit angle of 3 degree.

When the colour is green it means it has a positive draft it means area which are more than 3 degree is shown as green. If it is shwn in yellow that means it has less then 3 degrees and if in blue or red then it means it has negative draft.