Design of backdoor
DESIGNING OF CAR BACKDOOR:
OBJECTIVE:
To design a car backdoor using the given styling surface and come up with a new backdoor design assembly with all necessary mountings attached using NX CAD software.
INTRODUCTION:
Back Door which can also be called as TailGate consist of various components such as Inner panel, Outer Panel, Side Mountings such as Gas stay, Hinge mounting, Wiper motor reinforcements, latch and striker and its reiforcements. The parts are either be manufactured using steel or aluminium considering the weight, strength and other considerations depending on the use of car.
By using Auminium, the number of parts manufactured can be reduced by varying thicckness of the sheet and hence improves strength. the only disadvantage is it cost more than that of steel. hence it can be mostly seen in costly premium cars. whereas Steel, can be only stamped or punched unlike alulmium and variations in the sheet metal cannot be adjusted and hence more number of parts will be manufacted and hence there will be increase in weight of the car.
Components of the Backdoor Designed in this Project:
1. Inner Panel.
2. Gas-Stay Reinforcement
3. Hinge Reinforcement.
4. Latch reinforcement.
5. Wiper motor reinforcement.
Since the Outer panel has separated as two parts as upper and lower, and is given as a refence surface from the styiling team, designing of the backdoor totally depends on the styling surface and if ther are any errors, we as engineers have to rectify and resolve it before starting the designing procedure.
INNER PANEL:
Inner Panel is the inside of the backdoor where all the emboss, shock flow, strength improvement criteria shuld be followed while designing.
SHOCK FLOW:
In order to consider the shock flow when the car is hit by accident, embossed faces are creaated facing outwards so when hit, the embossed faces get more damage first and help reducing the damage to the passengers. the embosses are designed in such a way that when hit the shock flow must travel to the side ends of the car which is also a criteria followed while designing car components.
TOOLING DIRECTION:
Tolling direction is the direction where the sheet metal is going to get stamped. hence it is created in such way so that it gets stamped easily without much loss in shape of the design.
DRAFT ANALYSIS:
Draft analysis will help us clear any doubts while stamping the sheet metal in manufacturing process. it will show a clear view of where exactly the pressing will be perfectly done and where will be erros popping up. The color green represents that it can be stapmed without any casualties.
HINGE INFORCEMENT:
Hinges are used to mount the backdoor with the roof top providing a pivot point for opening and closing the door. hence in order to provide more strength to the hinge mounting, a reinforce ments is added there.
GAS STAY REINFORCEMENT:
Gas Stay is used to lift the tail gate up. it uses a piston recrocating up and down while opening and closing the tail gate. this type of gas stay is most;y seen is normal budget cars.
WIPER MOTOR REINFORCEMENT:
wiper motor s used to wipe the windshield for visibility against fog, mist, snow, dust and rain. it is mounted in the back as well as in front for cleaning the windshield for visibility. that will be mounted using this reinforcements shown below.
LATCH AND STRICKER REINFORCEMENT:
Latch and stricker is used to keep the backdoor in closed position, the latch is where the stricker pins when we close the door so that it wont open automatically.
LATCH TRAJECTORY.
The latch will be positions in an angle where it will be perperndicular to the hinge circle when drawn from the hinge axix taking is center point as reference. ths is followed because the stricker wont fit properly inside the latch until it is not perpendicular to the circle.
HEMMING:
Hemming is a process where the outer panel is mounted on the inner panel and later it will be fixed to it using sealants. hence necessary relief and gaps should be provide between hem in order to provide space to sealants to ooze out and fix properly.
INNER PANEL MOUNTINGS(A view from the inside):
ASSEMBLY OF BACKDOOR:
CONCLUSION:
Thus by using NX CAD software, the design and assembly of the backdoor is sucessfully made and necessary consideration were made and mounting and reinforcements were attached properly.