Design of backdoor

Note- Sir Due to the student edition of NX Cad , i am not able to upload the stp. file.

A

Project Report

Of

Design of Back door

On NX Cad

Submitted by

Manish Kumar

Back door

A back door is the is the rearmost part of an automotive which opens at the back end and gives access to the cargo area of the vehicle. Back door in a car gives access to the luggage area and in some cars to the passenger compartment. It is the rearmost part of the car and has mounts for tail lamp, hinges, wiper motor, gas stay etc.it is made up of an inner panel and 2 or 3 outer panel. All the panels of the back door are joined together by hemming or spot-welding process. In most of the car’s gas stay is used to operate the back door as it reduces the effort for the person opening. Few cars have electric motor to lift the back door when a switch is pressed. In the automotive industries it is known by different names such as tail gate, rear door and trunk.

Materials For Back door

Material used for the back door is chosen with various parameters such as cost, strength required, weight, no of the reinforcements required, method of creation. Steel is used mostly in cars. Now aluminium is also used in some luxury cars.

Types of Back Door

On the basis of the attachment of the back door to the car body during the opening of the back door, it is classified into 3 types

· Top mounted

· Bottom mounted

· Side mounted

Top mounted

It is the most common backdoor used in the automotive industry. It is used in passenger vehicles.it is has both gas stayed and motor powered.it provides greater rear visibility compared to other two backdoors.

Side mounted

It is mounted on the side of the car. Its advantage is that goods can be easily kept and removed from here. In India some SUVs used side mounted tail gate.

Bottom mounted

Bottom mount doors are used in estate type cars, pickup trucks and some luxury SUVs. This is the most comfortable type of back door, it can be also used as supporting table or holding long items.

On the basis of mode of operation, it is classified into two parts

a. Gas stay

Gas type is the common type used in the cars operating the backdoor. Components of backdoor are gas stay, hinge, wiper mechanism, rear light and rubber beadings for sealing of door.

b. Power lift type

Power lift type is also known as electric motor actuated type.It is mostly used in luxury cars. As it is the sophisticated type of operating the back door. A switch is pressed to open or close the door. This consists of the power latch, anti-pinch switch, PTF assembly.

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Design Consideration of the Back Door

· Visibility criteria

· Force dissipation

· Latch and striker positions

· Hinge positions

· Hemming and relief areas

· Gas stay position

Components of the back door

· Back door outer panel (upper and Lower)

· Back door inner panel

· Sealing flange

· Striker mount reinforcement

· Gas stay reinforcement

· Wiper motor reinforcement

· Hinge reinforcement

Raw surface of the back door

Back door outer panel upper part

Linked surface for the upper part

Using NX commands creating the part

Analysis of the back door outer panel upper part

Hemming and Relief Region

Draft analysis of the back door outer panel

Back door outer panel lower part

Linked surface for the lower part

The lower surface

Analysis of the lower part

Hemming and relief region

Draft analysis of the lower part

Sealing flange

Linked surface of the sealing flange

Tooling axis of the sealing flange

Sealing flange designed

Draft analysis of the sealing flange

Gas Stay Mount

It is an extra strength provided to the sealing flange which supports the gas stay mounting on the sealing flange.

Design of the gas stay mount

Using the sealing flange as reference surface creating the gas stay mount.

Draft analysis

There are two gas stay mounts in the sealing flange

Wiper motor mount

Draft analysis

Striker mount

Draft analysis

Hinge mount Reinforcement

Draft analysis

The two-hinge mount reinforcement

Hemming region of the back door

Draft Analysis

Conclusion

The backdoor is clearing the tooling axis with all the components.

https://drive.google.com/drive/folders/1Js_WESEHgD0SSfYy9DDs0HlAbr7YQA27?usp=drive_link