Hood design-Week 2

HOOD:

The hood or bonnet is hinged cover over the engine of the vechiles.Hood can open to allow access to the engine compartment .Most of the hood material is about 0.75mm . It is used to cover the engine compartment with some locking mechanism inside such as hinge assembly,latch striker reinforcement and a gas stay or stay rod

Latch:

Latch is a striker,which is placed over the hood and get attached to the hole provided in engine compartment.It is used for locking purpose the hood with the engine compartment.

Latch Trajectory:

while assembling the latch with the hood pannel it is used to place the latch striker exactly to the loch hole of the engine compartment.The ltch striker is placed on the inner hood pannel using latch trajectory path.This path is created using the hinge axis to draw the required path.

Hinge:

It is used as a controlling element for opening and closingof thew hood.It is used to connect the hood and engine compartment of the car.The hood hinge serves one one other purpose besides holding the hood safety.

Reinforcements:

It is a structure provide to reduce impact in collisions and sound absorption.Glass fibre or Glass filament is the most widley material used in the automotive industry.

Ebossed Surface:

This is the very important role in the car hood pannel while crashing or accident of a car.Most of the impact force are directly floes in the direction of collision and thus harm the driver sitting under the car.To over come this problem mostly V or Y shaped embossed are given in the inner pannel.Therefore that the force acting on the car it helps to diverts the force and reduce the impact of the accident and injury of the driver.

Mastic Data:

The main puropse of the hood should be in aesthetic look.so that we cant use the bolts and nuts to join the both inner pannel and outer pannel,Therefore that it has to be done with Heamming and Mastic sealent.Mastic sealent are the elastic component that behaves as a rubber ,it is placed between the outer and inner pannel.Mastic sealent has the tendency to increase the strength of the pannel by 80mm diameter.Ther gap between inner and outer hood pannel is 2mm.

In this creating the hood pannel the two types of process used are:

1.Deep drawing

2.Hemming

Deep Drawing:

It is the sheet metal forming process in which a sheet metal blank is radially drawn into the forming die by the mechanical action of a punch.It is thus a shape transformation process with the material retention.

Hemming:

It is the process is used to join the inner hood pannel and outer hood pannel together.It is the metal working process the sheet metal is rolled over onto itself and procees in which the edge is rolled flush to itself while a seam joins the edge of the two materials.

Conclusion:

In this project i have learnt the design model and assembly of a car hood pannel and the basic surface commands on NX CAD Student version software.

I have also learnt about the pederstrion safety of the hood design to prevent the driver from harm or collision

And i also learnt the manufacturing process used in the hood pannel like deep drawing and hemming.