Design of backdoor
AIM:-
Use the provided styling surface to come up with a back door design, use appropriate design methodologies, and provide the necessary reinforcements and embosses
Types of Back door
- Top mounted
- Side mounted
- Bottom mounted
Back Door Assembly Components:
- Inner Panel
- Outer Panel
- Hinge Reinforcement.
- Gas Stay Reinforcement.
- Wiper Motor Reinforcement
- Striker Reinforcement.
Types of the back door based on working positions:-
MANUFACTURING PROCESS:-
STAMPING PROCESS
Stamping processes to be used for a panel depend on its design. However, normally the processes used extensively are blanking, drawing, piercing, forming, notching, trimming,hemming, etc. Blanking prepares the initial approximate form of the part in flat sheet. Drawing is generally the first operation to attain depth related form. Piercing, notching, hemming, are product design related operations. Trimming generally removes the extra material on the periphery of the panel provided for blankholding during draw operation. Decision on trim line is very important and becomes deciding factor to obtain good draw.
fig.3.2.1 stamping process
1. Blanking
When required, blanking is the first step of the stamping process. Blanking is the process of cutting larger sheet or coils of metal into smaller, more manageable pieces. Blanking is usually performed when a stamped metal piece will be drawn or formed.
2.Piercing
If a part requires slots, holes, or other cutouts, piercing can be employed. Piercing, which can be performed simultaneously with blanking, punches the requisite shapes out of the metal sheet.
3.Drawing
Drawing is the actual stamping in the metal stamping process. A punch forces a section of metal through a die, providing the primary shape of the part. When the depth of the part is less than the primary opening, it is considered shallow drawing; parts with a depth greater than the opening are deep drawn.
4.Bending
Bending is a fairly self-explanatory process. The part-in-progress is placed on a specially designed die and a ram pushes against the metal, providing the required bend. Bending is performed after drawing, as attempting to punch an already bent piece of metal causes the entire part to deform.
5.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. The accuracy of the operation affects significantly the appearance of the car’s outer surfaces and is therefore a critical factor in the final quality of a finished vehicle.
roller hemming :-The robotized hemming systems use a standard industrial robot integrated with a roller hemming head, offering a very flexible solution. This roller hemming head consists of a body, some guides and a number of rolls that are designed according to the geometry of the part in each case. 
TOOLING AXIS FOR PART :-
BACKDOOR DESIGN WITH INNER PANNEL OUTER PANNEL:-
- Outer Panel
- Inner Panel
Lancing:
As mentioned above about the lancing process. Here we use in the inner panel of the door. It is done to join the outer and inner panel with the help of mastic sealants.
Draft analysis:-
The Draft Analysis allows the user to easily analyze a part for proper draft angle. A Draft Angle describes the amount of taper for molded or cast parts perpendicular to the parting line. Find the Draft Analysis in Tools tab. Draft Analysis is applicable for 3D part models.
Hemming:-
Hemming is a technology used by the automotive industry to join inner and outer closure panels together (hoods, doors, tailgates, etc.).In addition adhesive bond provide for excellent joining of panels it also reduce vibration .here this design 0.2mm clearance provided for hem glue .
As explained above about the hemming. Here we have used it to join the inner and outer panel of the back door
CONCLUSION:-
Design of backdoor is made by NX CAD softwere and done draft analysis by using NX CAD. backdoor design is close made by using hemming process.