Design of backdoor

OBJECTIVE : To design the back door of the car using the appropriate design and provided class-A surface by considering the design parameters and also design the necessary reinforcements using NX-CAD.

PARTS OF BACKDOOR :

• Back door outer panel
• Back door inner panel 
• Hinge reinforements 
• Gas stay reinforcements
• Wiper motor reinforcements 
• Latch and striker reinforcemnts

CLASS A SURFACE : The given class A surface is repaired before proceding further. Backdoor outer surface is divided into two parts as back door outer upper and door outer lower.

TOOLING DIRECTION : 

BACK DOOR INNER PANEL : Back door inner panel is a component which is used to strengthen the door assembly and it is an important component on which all the accessories and reinforcements are mounted.

MASTIC REGION : Mastic points are defined on the back door inner panel where mastic sealents are used to join the inner panel and outer panel. Mastic sealents are elastic compound that behave like rubber.

EMBOSSES AND REINFORCEMENT 

Hinge emboss and reinforcement : 

Gas stay emboss and reinforcement :

Wiper motor emboss amd reinforcement :

Latch and striker emboss and reinforcement :

LATCH AND STRIKER TRAJECTORY : The trajectory is created to position the latch and striker. Latch system must be able to catch striker of the door while closing. Circle is drawn from the hinge axis. The striker follow this path.

HEMMING : Hemming is a forming operation in which the edges of the sheet are folded over another part to achieve a tight fit. Normally hemming operation is used to join inner and outer closure panels together. This improves the appearance of a part and also reinforce the part edges.

Hemming corner relief : Hemming relief are cut out which are provided on the hemmed corner of the panel assembly to avoid some of the hemming defects.

DRAFT ANALYSIS : Draft analysis is performed to check wheater the designed part is suitable for stamping operation with respect to the tooling direction. The minimum draft angle provided here is 7 degree.

BACK DOOR ASSEMBLY :