Design of backdoor

THE BACKDOOR

Aim :

To develop the car Backdoor(Tail gate) with the reference of given skin data as per engineering standared by using NX12

Back Door-

The Backdoor or Tailgate is the panel that covers the boot (or trunk) of an automobile. It enables access to the main luggage compartment. A hinge allows the boot lid to be raised, while devices such as springs or gas cylinders hold it up in the open position.

In principle, tailgate have to fulfil similar requirements and are subject to the same design guidelines as bonnets. However, aluminium sheets are used much less for Tailgate than for bonnets.

Backdoor are hinged at the top and open upwards, tailgates are lateral opening doors which are hinged at the left or right side. They greatly benefit from a reduced weight due to easier handling. In addition, a reduced weight can translate into significantly lower rear axle loads (as these panels overhang the rear axle) and hence additional seating capacity.

Design Consideration-

• Rear Visibility
• Hinges and gas stays
• Fit and Clearances
• Boot spaces and accessibility

Embossing -

Embossing is a metal forming process for producing raised or sunken designs or relief in sheet material by means of matched male and female roller dies, theoretically with no change in metal thickness. Embosses are created to provided addition strength and to direct the forces towards the hindge and body of the car.

For inner panel to act as a good reinforcement, it needs to disperse the stress outwards, hence the emboss was designed In such a way that the forces are directed outwards or away from the center.

Hinge Emboss

WiperMoter Emboss

Latch and Striker Emboss

Gas Stay Emboss

Reinforcement-

Instead of making the whole inner panel of a thicker sheet, a sheet with less thickness in addition to local reinforcement is provided to increase the strength of the component and reduce the weight.

Mastic Sealings –

As we know that the main purpose of the outer panel is for the aesthetic looks. Thus we cannot use bolts or welding. This has to be done with the help of the hemming and mastic sealants. Mastic sealants are elastic compound that behaves like the rubber. It is placed between the outer and inner panel. Initially is it in paste form, but after the hot furnace bath it gets hardened thus joining the outer and inner panel. Mastic sealant has the tendency to increase the strength of the panel and has influence of 80mm diameter.

Hemming:-

Hemming is the process in which the edge is rolled flush to itself, while a seam joins the edges of two materials. Normally hemming operations are used to connect parts together, to improve the appearance of a part and to reinforce part edges.

Relief is provided onto the part or component in order to remove any stresses developed in a particular area i.e sharp corners that takes place during the hemming process is carried out. Thus corners are rounded or chamfered.

Force Distribustion :

When the car hited at rear end, the force which acted should be react outside. The Y emboss which is helps to move the force to the outer end.

Corner Relief:

Relief helps to control sheet metal material behavior and to prevent unwanted deformation during unbend operations. So here i gave two cornor relief for Back door.

Final Images:

Conclusion:

Thus the design of BIW of a Backdoor of a car has been designed using NX-CAD-12.