Roof challenge
Design And Analysis of Roof
Objective
To design the Roof based on the given inputs, Such As roof Styling ,design perameters and standards to develop essential flanges and reinforcement.
The roof panel serves as a compartment shielding and connection of body sides, front and rear roof cross members.
The main purpose of roof is protect the passenger from sunlight, rain, wind, dust and other medium.
In this projects we will be focusing on design of roof rails ,Reinforcement centre and bow roofs.
Roof Calculation.
Design of roof rails
Front roof rail
Bow roof
Center roof
Rear Roof Rail
Design of roof
Draft Analysis
drft analysis is carried out to obtain visual feedback on back draft condition of the part and an optimum die press direction is defined that maximum back draft. this Analysis helps us to avoid die lock sistuation,make decision on an appropriate parting line,obtain suggestions on cutter sizing for machining and other purpose.
Section Modulus
The Study is done based on two Criteria
1 Heat Distortion criteria
2 Snow load criteria
Heat Distortion Criteria
Bow Roof Prediction Fromula :- W = 1.73*10^(-3)*L + 1.85*10^(-8)*R^2/t +1.10*10^(-3)*I-2.68
Judgment criteria :- ok<2.7mm<NG
L =Roof length criteria
R = Roof curvature
R =2(Rx*Ry)/(Rx + Ry)
Rx = X Curvature
Ry =Y Curvature
t =Roof plate thickness (mm)
I =Bow Roof Span (mm)
|
Parts |
Rx |
Ry |
R |
t |
L |
I |
W |
Ok/NG |
|
FR & BW 1 |
5358.43 |
3427.59 |
4180.84 |
0.75 |
2103.68 |
593.78 |
1.66 |
Ok |
|
BW 1 & CTR |
4667.76 |
7438.74 |
5736.13 |
0.65 |
2103.68 |
241.07 |
2.16 |
Ok |
|
CTR & BW 2 |
3969.93 |
10559.68 |
5770.45 |
1 |
2103.68 |
314.98 |
1.92 |
Ok |
|
BW & RR |
3315.10 |
14498.99 |
5396.35 |
0.75 |
2103.68 |
354.98 |
2.068 |
Ok |
Snow load criteria
|
Parts |
Iy |
α |
Lx |
Ly |
Y |
s |
Rx |
Ry |
t |
Qr |
Determination |
|
Bow roof 1 |
44497 |
1.045 |
1097.42 |
2054.5 |
593.78 |
519.96 |
3001.31 |
7301.10 |
0.65 |
129.76 |
Ok |
|
Center reinforcement |
47151 |
0.51 |
1077.57 |
2054.5 |
241.078 |
373.33 |
4271.17 |
4284.64 |
1 |
135.32 |
Ok |
|
Bow roof 2 |
47434 |
0.616 |
1060.62 |
2054.5 |
314.98 |
441.67 |
3098.08 |
16142.05 |
0.65 |
79.59 |
Ok |
From the above results it can be seen that the designed roof passes Snoe load criteria.