Design of backdoor

BACK DOOR

AIM:- Construct back door design by using the provided styling surface, and also use appropirate design methodologies, provide the nescessary reinforcement and embosses

BACK DOOR

Back door is a hinged part which is used as enter and exit in vehicles.Back door also helps to access lungage compartment which is located near the rear passenger seat.In most of the cases these back doors are operated with the gas stay to reduce the human efforts. Some luxury cars have powered back door which functioned with the help of electic motor. This kind of sytem is called powered trunk link stytem. In case of safety, the back door desgined should meet the safety requirement for the rear collision

REQUIREMENTS OF TAIL GATE

• functional requirement
• Rear visibility criteria
• Rear crash regulation and requirments
• Sealing and its function

JOINING TECHNIQUE

• Hemming
• Spot welding

MANUFACTURING TECHNIQUE

• Casting
• Stamping

DOOR ANALYSIS

• Bend test
• Torsion test
• Assembly load test
• Assembly care
• Endurance test

TYPES OF BACK DOOR

TOP MOUNTED

This type of back door is used in a station wagon, pickup truck and of the SUV

todays modern cars use top mounted tailgate sytem which are both powered and aslo gase stay supported. These top mounted tailgates provide greater visibility compared to others door models

SIDE MOUNTED DOOR

Side mounted doors are which used in the van types MPVs,SUVs,pick up truck vehicles. These doors are more convienint to goods handle . These doors also save accidental head impacts. It is easier to load and unload items in the side mounted doors.

BOTTOM/SPIT TYPE

This type of door are used in pick up vehicles and some luxuary SUVs. The bottom spilt type is also used as table for the tour going peoples and its very easy to handle goods

BACK DOOR BASED ON WORKING MECHANISM

GASE STAY TYPE

Gase stay is a device which support the back door while open position. gase stay type back doors are commonly used tailgate mechanism from lower varient to luxury varient segment too. The components of tailgate consist of a hing, gas stay ,Reinforcement componets,striker and some rubber beadings .There is two varient in gase stay one is Hinge inside back door and second one is hinge out side back door.

POWER LIFT SYSTEM

Power lid stystem is another method used in trunk/liftgate opening mechanism which automatically open and close of the trunk and liftgate and realase of the latch by the touch of a button. The powered trunk lid system consists of a power switch,anti pinch switch,PTG assy,PTG main switch

MATERIAL COMPARISON

BACK DOOR ASSEMBLY

• Inner panel
• Outer panel
• Hinge reinforcement
• Gas stay reinforcement
• Wiper motor reinforcement
• Latch/stricker reinforcement
• 

INNER PANEL

The inner door pannel is a component which is used to strengthen the door assembly. and its is the major part on which all accessories are mounted like hinges, glass guied channel,moulded trim,latch/striker etc.The possible methode is intergration method. In this intergration method, the part is stamped out of a single blank. This reduce the number of tools needed, assembly cost and elimate the fit ability problem

OUTER PANEL

The outer pannel of the vehicle is a aesthetic part . The outer panel also has the provisions for the tail lamp, rear fog lamp and also has the provison for license plate mounting. The outer panel provided with the coating of multi stage which has the property of scracth resistance, rust preventison, smooth and attrative finishes.

HINGE REINFORCEMENT

Hinge is used to operate open and closeing of the door.Hinge can placed outside or inside of the door.One end of the hinge is fixed.

GASE STAY REINFORCEMENT

Gase stay reinforcement provided at the gas stay mounting area to compensate weakness and improve strength.

LATCH AND STRICKER REINFORCEMENT

Latch and stricker forms the locking mechanism of the back door with the car. Due to regular opening and closing and over slamming of the back door there is a stress developed in the latch and striker area to compensate this problem the reinforcement is used

WIPER MOTOR REINFORCEMENT

Wiper motor reinforcement created to mount the wiper motor.

HEMMING OPERTION

Hemming is a mechanical joining opertion which is used to join the inner panel and outer closure panels as found on hoods, bonnet,lift gate,doors, wheel arc. To increase crash resistance the gape between the hemming flang is filled with high strength adhesiv which also prevents from collision

HEMMING RELIEF

Hemming relif are cut out which are provided on the conner of the hemming flang to avoid some hemming defects such as wave-like and wrinkle fromed surface.

LATCH/STRIKER ROATION ANGLE

This rotation angle of the line denotes the where we want to place the Latch/striker

TOOLING DIRECTION

Tooling Direction basically the direction that the mold pulls apart.The mold is build two seperate parts one is core side and other one is cavity side. The core pulls apart from the cavity and thats the dyeline or the tooling direction

CONCLUSION

Thus the design of the BIW fixture of a backdoor of a car is designed using NX CAD