Design of backdoor

#Challenge 8 Backdoor Design

Name: Sri Gokul P

Course: Automotive Sheet Metal Design using Siemens NX CAD / CATIA V5

BACK DOOR:

A backdoor is located behind the passenger seat and used to access a storage area also known as a luggage compartment.

It is easy to access because of gas stay is presented in the backdoor and opening using electric gas stay with sensors almost this feature in a luxury car.

Common name of backdoor: Dickeys, trunk, tailgate and boot.

Backdoor Material: steel, aluminium.

Benefits of backdoor: low cost, less maintenance, and easy replacement.

TYPE OF BACKDOOR:

They are mostly three types used in automotive industries because of cost-efficient and easy to access.

1. Top mount.
2. Side mount.
3. Bottom mounts.

Top mount ü Working process: the door is mounted in the hinged to lift upward ü Gas stay used because easy to access. Most backdoor top mount vehicles used in domestic car ü Easy access to store luggage.
Side mount ü Working process: the door is side mounted in the hinged. ü Backdoor open in outward. ü Uses: vans, school buses and heavy-duty vehicles.
Bottom mount ü Working process: the door is bottom mounted in the hinged. ü Uses: truck, Low-duty vehicles.

MAIN PART IN BACKDOOR:

1. Inner panel
2. Outer panel- they are two Parts
3. Upper outer panel
4. Lower outer panel
5. Hinge reinforcement
6. Wiper reinforcement
7. Gas stay reinforcement
8. Latch and striker reinforcement.

Inner Panel ü It is an important part of the hood because of increased pedestrian safety, the strength of backdoor, durability of the car. ü In inner panel to increase the durability of the structure includes reinforcement.
Outer Panel ü It is an important part of the hood because of increased pedestrian safety, the strength of backdoor, durability of the car. ü In Outer panel to increase the durability of the structure includes reinforcement. ü It has two Parts: I. Upper outer panel II. Lower outer panel	Upper outer panel Lower outer panel Upper & lower outer panel assembly
Hinge Reinforcement ü Hinges are connected car body and backdoor. Mounting is very important because during pedestrian all shock waves will move through hinges to the car body.
Wiper Reinforcement
Gas Stay Reinforcement ü Gas stay is used to lift the backdoor and the total weight of the backdoor impact the gas stays mount area.
Latch And Striker Reinforcement. o The purpose of these latches and strikers is to keep your backdoor closed, protecting you from getting injured by flying parts if there are any accidents while driving.

DESIGN METHODOLOGY:

Here I used the Top and bottom approach to create a back door.

The parameter of thickness is 0.75mm for all parts

• First, I created an assembly folder of the backdoor, in that given skin data of the backdoor has been reworked.
• Create the tooling direction for an operation like emboss used as a vector direction.
• In an inner panel, I create a sealing flange, connecting flange, connecting blends and all other work are done in the inner pane.
• And create a wiper mount area, gas stay mount area, hinge mount area, and latch & striker mount area in the inner panel of the backdoor.
• In the outer panel, hemming design and relief work were done.
• The backdoor reinforcement part is designed for improving the strength in the local area.
• And all parts are assembled in one assembly part file.

DRAFT ANALYSIS:

Inner Panel
Outer Panel	Upper outer panel Lower outer panel
Hinge Reinforcement
Wiper Reinforcement
Gas Stay Reinforcement
Latch And Striker Reinforcement.

MANUFACTURE TECHNIQUE:

• Bending: The act of bending involves applying force to a sheet metal workpiece to produce a curvature. In general, bends are used to produce simple curved surfaces instead of complex ones.
• Hemming: Hemming is a technology used by the automotive industry to join inner and outer closure panels together (hoods, doors, tailgates, etc.). It is the process of bending/folding the flange of the outer panel over the inner one.
• Hemming is performed in order to:
• Achieve a better final geometry in the vehicle´s part
• Add resistance and rigidity to the part
• Allow safe handling of the part.

• Stamping: Stamping is the process of cutting and forming metal using a stamping press and a series of dies. The material is commonly used to make auto parts like hubcaps and fenders.
• Extrusion: Extrusion is a process that is used to create long metal shapes. To make a rod, for example, the metal is pushed into a steel tube. The rod is then "extruded" through the tube to make it longer.

CONCLUSION:

As result, to determine a back door strength using draft analysis. Consider all of the parameters and generated the automobile back door.