Challenge

Hood design-Week 2

HOOD DESIGN

hood also referred to as a bonnet is a cover of engine compartment it is very critical part because of consisting frontal crash pedestrian safry energy out side of the car rather than send force impact the car body dring the collusion . levers are provied inthe car two tybe to accesss the HOOD opening they are primary lever and secondary lever .
primary lever available in same cares below cars below the driver seat to open hood little around 10MM (to) 15MM and secondary lever present inside the hood to opening angle is less there is high chance of primary lever when hood opening angle id less there high avarage height in INDIA around 5.5 feet and europe about 6feet as per reqirement to concerwn company will design to fix necessary opening angle.

HEMMING PROCESS :

Hemming is a forming operation in wich the edges of the sheet are folded (or) folded over another part in order to achive a tifht fit. Normaly hemming oper ation are used to connect parts together , to improve the apperance of a part and to reinforce part edges
In car part production hemming is used in assembly as a secondry operation after deep drawing trimming and flanging operations to join two sheet metal parts (outer and inner ) together. tybical parts for this tybe of assembly are hoods doors, trunk lids fenders.
Convenstional die hemming
Rool hemming

CONVERSIONAL DIE HEMMING :

Conversional die is hemming is suitsble for mass production . in die hemming tool .Normally the actual hemming is a result of a forming operation in wich the flange is formed with a hemming tool after the drawing and trimming operation have been completed .The fromed with a hemming tool after the drawing and trimming operaton in which the flsnge id formed servel process steps .

ROLL HEMMING :

roll hemming is a carried out incermentally with a hemming roller . An industrial robot guides the hemming roller and the flange roll hemming operation can be divided into serveral pre-hemming and final hemming process steps .rool hemming is very fixable to use and tool cost are significantly lower as compared to those of conventional die hemming however the cycle times are much higher since the hemming is realized using a hemming roller follows a defined path.

IMPORTANT CONSIDERATION IN HOOD DESIGN :

CAR HOOD

GAS STAY :

suport rod in curve bend shape to increase rigity avoid wobbling with sufficent clearence around the parts provied bet ween the engine compartment and bonnet or in vice- versa supporting rod consist of opening angle mount and dis mount of the rod fixing location ( bend not less then 35 MM more bend casues reduce in opening angle and rod bends due to hood weight).
supporting rod should be arrange opposide side of battery in the engine compartment other vise causes difficult battery replacment .

GROMMET :

In engine compartment and hood grommet used to keep the support rod (or) gas stay in rest condition

STRICKER :

latch is a striker is placed over the hood & get atteched to the hole provided in engine compartment this isused for locking purpose of hood with engine compartment .
stricker is the part wich is used to hold the hood with the engine compartment by using the latch which it is attached in the engine compartment when the hood not require to open up the striket is attached to the bottom of the inner and it hits nthe latch and locked with it when the hood is dropped down.
there is lever which is provided inside the cabin to the driver to release the latch pressure once it can be done the hood will opens up in a inch then we can able to open hood more.

HINGES :

hinges is used for controlling element for opening & closing of the hood it connects the hood & engine compartment of car. The hood`s hings one other purpose besides holding the hood -saftey .
it is used to fix the hood to the engine compartment .
for any compant has to be open and close with an then hinge plays a majer role. it has two simple parts ( one is hood side hinge another one is engine compartment side hinge ) and assembled with the single axis.
hinge assembled with the each outwards end of the hood and engine compartment .

FINAL HOOD ASSEMPBLY DESIGN :

successfully completed hood assembly challenge based on given master section by following all given saftey parameter with help of NX CAD software .
kindly download hood assembly zip file attachment for the extract for your evalaution and thanks for your guidens .

CONCLUSION :

Thus the hood was successfully designed by following the procedures . The model is passed to the CAE team for further analysis for optimizing the design .hood inner and outer panales are usually manufacture through metal stamping process .Metal stamping is a manufacturing process used to convert flat metal sheets into specific shapes .is a a complax process that can include a number of metal forming techniques blanking ,punching ,bending and piercing ,to name of few stamping -also called pressing- involves placing flatsheet maeal flanging are all stamping techniques used to shape the Metal.
Important changes have been made to the EURO NCAP rating resulting in the indroduction of the over all rating scheme .
indiviual documents are relesed for the four mani areas of assesment.
Assessment protocol- Adult Occupant protection.
Assessment protocol-Child Occupant protection.
Assessment protocol- Pedestrain protection.
Aaaessment protocol- Safety Assist.

Thankyou :-)

Ship work like this
in your own course.