Design of backdoor

Aim

      To design back door of car using NX12

BACK DOOR

       A door is a hinged part which is used for entry and exit of the vehicles.Back door are one of the type of door of the vehicles which are located next to the passanger seat which provides access to the luggage compartment.in the most of the car these back door are operated with the help of door.Some luxuary car have powerd back door which in turn is driven by an electric motor.This kind of system is also called a powered trunk lid system hatch back or station wagons are sold as 3door or 5doors models.In this case the rear hatch is classifed asdoor this is because it enters the passenger compartment.The naming is mainly used in europe countries.Should meet the safety requirement of the rear collision

      The majior problemin back door is material selection .mostly in past days steelis used but it makes a very problem the steel part have heavy wight so it reduces the fuel economy insted of steel presently in high end cars aluminum is used the main objective of aluminum it have less denser  material and its sutabile for complex shapes and it also given the thickness locally because it done casting in case of steel we used deep drawing operation there are some of the advantage and disadvantage.

TYPE OF BACK DOOR

• Top mounted
• Side  mounted door
• Bottom type 

Top mounted

        This type of back doors is used in a station wagon, pickup trunk and some of the spot utility vehicles. Today's modern cars use top mounted tailgating system which are both powered and also gas stay supported

SIDE MOUNTED DOORS

                  the name signifies the side mounted doors are the one which is used in the van typepickup truck vehicles. These side mounted doors or barn doors are a lot easier compare to  top mounted doors. These doors are generally smaller in size and can be easily accessed. These doors are more convenient for the goods handlers for long pipe and lengthy components where one door is kept open. These door also save accidental head impacts. It is a lot easier to load and unload items in the side mounted doors

BOTTOM TYPE DOOR

                  This bottom type type backdoor system are used in the car type such as car, pickup truck and some luxuary SUVs. These are the most convenient type of back door in which the bottom split is used as a support or even as a table for the tour going people.

Gas Stays type

            Gas Stay type backdoor is an ideal and most commonly used back door mechanism from lower segment car to luxury car segment. The ideal components of tailgate consist of a hinge, door, gas stay and some rubber beadings for sealing of door.

POWERED LIFT SYSTEM

           Power trunk lift system is another sophisticated way of trunk or liftgate opening mechanism which is to automatically open and close of the trunk and release of the latch by the touch of a bottom.

            Powered trunk Lift system consists of a power latch, anti pinch switch, PTG assly, PTG main switch

            The anti pinch switch is located in order to avoid accidental hand insertion during the operation of the door.

Latch Reinforcement

      A latch is not the same as the locking mechanism of a door or window, although often they are found together in the same product. Latches range in complexity from flexible one-piece flat springs of metal or plastic, such as are used to keep blow molded plastic power tool cases closed, to multi-point cammed latches used to keep large doors closed.

Hemming

       Hemming and seaming are two similar metalworking processes in which a sheet metal edge is rolled over onto itself. Hemming is the process in which the edge is rolled flush to itself, while a seam joins the edges of two materials.

The Different panels or regions are as follows

•  Inner panel
•  Outer upper panel
• outer lower panel

Backdoor Assembly

•  Inner panel
• Outer panel
• hinge and its reinforcement
• wiper motor reinforcement
• latch and stricker and its reinforcement

DIFFERENCES BETWEEN ALUMINUM AND STEEL PART

ALUMINUM	STEEL
Part are casted	part are stamped
Reinforcement can be neglected	Reinforcement are necessary
Local thickness can be varied	Has only uniform thickness
Light in weight	Heavier in weight
less number of components	more number of components