Roof Design

OBJECTIVE:

They are provided car roof styling design develop the BIW Roof rail, the bow roof rail, the center roof rail and the rear roof rail by the following engineering standards. The roof must subjected to draft analysis to verifying whether its satisfies the manufacturing requirements and we need calculate the heat distrotion and the snow load calculation.

INTRODUCTION:

1. An automoblie roof or car top is a portion of an automobile that sits above the passengers compartment protecting the vechicle from the sun, wind, rain and the other things.

2. It is also acts as the cross member between body sides of the car body and provides provisions for the front wind shield, backdoor.. Roof assembly also one among the parts which provide safety for the rollover accidents.

DESIGNING OF THE REINFORCEMENTS:

1. Ditch area:

The ditch area of the roof was designed by taking that considerations provided by styling team. The ditch area has designed to have a mininmum of 3 degree of maximum draft angle and the 0.75mm thickness. The ditch area is extended portion of the main roof concealed by the other Biw panels. The rails of the roof were attached by using spot welds and the mastic sealents. visiblity criteria, Head room cleareance, windshield clearence and back door clearence has also going to be taken in the design consideration of roof.

2) Front roof rail.

The front roof rail has located in the front of the roof were the wind shield is join with the roof. The visiblity criteria and the head room clearance of a passenger are taken in a consideration for that bottom flange one end is join using spot welding while the other end as joined using mastic sealents for a joining process.

3. Bow roof

Bow roof is additional stiffening member for roof to the increase the strength and so it can satisfy those standards both the end are used to join the mastic sealent to improve the strength and also that would not affect the styling surface.

for creating bow roof we need to take a reference from the surface A . The tool name is geomentry wave linker it is very use take that referance by using that we are needs to develop the bow roof with the respect to the standards.

4. Center roof rail

Center roof rail or the reinforcement center is located at the center of a roof. The cross section of this is more since its needed to provide more strength to the roof. here both the ends are joined by the use of mastic sealent.

The center roof rail is a center parts that we need to create and the width for center roof rail is about 80mm to 90mm . the center roof rail has to be bigger one than the bow roof rail so that we can have that sufficent strength to protect the car..

5. Rear roof rail

This roof rail is joined with the back door and the roof. inputs from the back door are taken according to consideration for designing this roof rail. here one end is joined by using the spot welding and another side is joining by using the mastic sealent

we have to use the designing standard to design the rear roof rails so we can give the efficient space for the placement for the backdoor and also for the c piller .

ANALYSIS:

1.Heat distrotion criteria:

1.Heat distortion is the temperature at which the metal is softens and deforms unders a specific load. This study is the done to check the ability of the roof to withstand high temperature with respect to the positioning of reinforcements which contribute to increase the strenth.

In the heat distrotion criteria my module has been passed the standards and good to go for the furher process and so we can able to maufactures the part .

SNOW LOAD CALCULATION:

Snow load calculation is the type of a study done to check the ability of roof whethwer it can be withstand to different temperatures like cold weathers and for also from the atmosphere were the snow falls and the rebounds to its orginal position when a snow of load has removed.

From above the results, these values for the snowload values it does satisfyed those condition.

But we can add the additional strength for the roof so we can able to increase the thickness and create the emboss for the roof.

3. section modulus..

1. Bow roof 1

2. Bow roof 2

3. Center roof rail:

4. DRAFT ANALYSIS:

1.While designing a component a the design engineer must make sure that component can produced by any means of the maufacturing methods with least amount of time , material and man power. so that we can reduces over all cast of a car.

2. In NX draft analysis can be done after the modelling so that we can verify whether the manufacturing by the pressing or not. one surface can be highlighted by the green and other side by red colour means that the model can be manufactured

3. draft means which is essitential for a creating product basically the draft is angle . by using the angle so we can able to remove our work piece or the finished product saftely with out damage from the operation of making components.

Results of draft analysis shown in figure:

ROOF :

2. Front roof rail :

3. Bow roof :

4. Center roof rail:

4.Rear roof rail:

Conclusion:

1. Thus required Ditch area, Bows and reinforcement for the roof were designed and the developed from the given class A surfaces.

2. Calculations for the heat distrotion and the snow load predictions its also performed

3. The BIW roof of a car has designed and achieved.