Design of backdoor

back_door_introduction:-

Back door is an closure commodity,for designing back door designer has to cosider rear visibility criteria,hinge position as per latch and srtiker trajectory,rear crashworthiness,wiper motor position,manufacturing feasibility and joining method.

1.Back door upper panel:-

at corner hemming relief is provided to avoid overlaping(wrikle) defect.

outer panel and inner panel are joined with the help of hemming process

2.Back door Lower panel:-

at corner hemming relief is provided to avoid overlaping(wrikle) defect.

outer panel upper and lower are joined with thw help of spot welding and

lower outer and inner panel are joined with the help of hemming process

3.Back door Inner panel:-

back door inner panel is designed to increase strenght of back door.this inner panel is joined with thw help of hemming process with outer panel.

back door is designed as per  manufacturing feasibility by deep draw method in which designer has to consider positive draft of minimum 7 degree w.r.t tooling direction.

4.Back door Hinge/gas stay/latch/wiper motor reinforcements:-

all reinforcements are added in door inner panel with 1.5mm thickness,to compensate strenght.

5.draft analysis:-

following image shows draft analysis for back door inner panel with respect to topling direction.

with the help of draft analysis we can conclude that panel is feasible to manufacture.

6.Assembly view

Objective:-

with the help of given outer panel and all other constrians for back door we can design door.

by knowing hinge position we can calcutate latch position with the help of trajectory circle.

with thw help of body-side,roof and floor flange resting can be designed.with the help of draft analysis we can check manufacturing feasibility. and also while designing we have to consider rear visibility criteria.

Manufacturing process:-

stamping(deep drawing) with the help of required tonnage press machine we can manufacture all outer,inner and reinforecement panels.

joining methods:- 

outer panel and inner panel are joined with the help of hemming outer panel.at some portion we use mastic joint in outer and inner panel.

outer upper panel and outer lower panel are joined with the help of spot welding.

windshield is joined with the help of sealant with panel.