Design of backdoor

INTRODUCTION:

The Back Door of a car is the rearmost part of the vehicle which gives access to the trunk space of the vehicle. The rear door also supports the reinforcements and added weights of the Wiper Motor, Gas Stay, Tail Lamp, and Latch and Striker.

1) The Backdoor/tailgate is one of the closure commodities in BIW sheet metal design. The backdoor has a lot of components inside and is designed to incorporate them easily. It affects the rear visibility and luggage area.

# The backdoor consists of the following basic components:

1. Backdoor Outer Panel (Upper)

2. Backdoor Outer Panel (Lower)

3. Backdoor Inner Panel

4. Hinge Reinforcements (LH & RH)

5. Gas-Stay Reinforcements (LH & RH

6. DESIGN INTENT

   The intent of the project is to design a Body In White Back Door of the vehicle considering the engineering standards and manufacturing requirements which satisfies the Deep Drawing Process.

7. DESIGN OF BACKDOOR OUTER PANEL:

   The Outer Panel is the styling surface of the back door. Other components of the backdoor are designed with reference to the outer panel. It acts as the outer cover and deals with the aesthetics of the car.

   In this design outer panel is divided into two parts

   1. Outer Upper Panel

   2. Outer Lower Panel

   Outer Upper Panel:

   The Outer Upper Panel Extracted from a styling surface.

   The panel is altered for the required design with the surface tools of NX CAD

   The thickness provided for the outer panel is 0.75 mm

   Hemming is provided with the corner relief.

8. Tooling Direction:

   • Before starting to design the inner panel of the back door the tooling direction for Deep Drawing purpose should be created.

   • Then the styling surface needs to be checked and analyzed since it might have irregularities, hence it must be fixed first.

   • Then the back door was designed using the top-down

   • DESIGN OF BACKDOOR INNER PANEL:

     The Inner Panel Extracted from a styling surface.

     The panel is altered for the required design with the surface tools of NX CAD

     The thickness provided for the outer panel is 0.75 mm

   • After creating the tooling direction the design of the inner panel will begin where we will first develop an effective sealing flange by checking all the boundaries and by following the shape of the inner panel design. By creating multiple flanges and by using surface modeling techniques the concept design of the inner panel was created.

     • After the concept of the inner panel is developed, then the child components like a hinge, latch, gas-stay locations, and their reinforcements must be designed. Which completes the overall design of the tailgate.

     • The embosses were created in ‘V-Shape or Y-Shape’ so that if the vehicle undergoes the crash then the force dissipates over it which reduces the damage transferred to the trunk space.

     • CONCLUSION:

       Thus the Body In White Back Door of a car was designed following the engineering standards and also the deep drawing requirements were satisfied.