Roof challenge

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 protects the passenger from any injury when the car gets crashed or is rolled over or something heavy falls on the roof.

OBJECTIVE:

The main obective of this project is to understand the design process to design the roof with all the roof rails and to understand the calculations behind it.we also get to learn about the different tools used in NX cad for designing

METHODOLOGY:

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

1.Front Roof Rail-

The front roof rail is located on the front of the roof there the wind shield joins with 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 joining using spot welding while the other end is joining with the roof using mastic sealants for increased strength

2.Bow Roof 1-

Bow roof is an additional siffening member for the roof to increase the strength and so that it can safity the norms.both the ends are joined together using mastic sealants to increase strength and also since this would not affect the styling of th roof

3.Centre Roof Rail-

Centre roof rail or the reinforcement centre is located at the centre of the roof.the cross section of this is more since it needs to provide more strength to the roof.here both are ends are joined together using mastic sealents.

4.Bow Roof 2-

This bow roof also have the same purpose as that of the first one.this one is located between the centre bow roof and rear roof rail.

5.Rear Roof Rail

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

here one end is joined using spot welding while the other end is joined using mastic sealents

we then also make the ditch area around the roof

Ditch area the extended portion of the main roof concealed by other BIW panels

CALCULATION:

Heat Distortion Curvature Study-

This study is used to find out and predict the heat distortion temperature at where the material starts to soften when exposed to a fixed load. so in order to avoid bending or damage of the roof based on the calculation we damage of the roof based on this calculation we will decide the position of the roof brows of the roof

ROOF:

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 shown in yellow that means it has less then 3 degrees and if in blue or red then it means it has negative draft.

CONCLUSION

We were successfully able to design the roof with all the roof rails for better support and strength.we designed if so as to satisty the norms and regulations by calculating the heat distortion criteria and the snow load critera.while doing this we also understood about the methodology behind designing the roof of the car and what all we take into consideration while designing so.