Hood design-Week 2

Aim:-Design Hood outer panel, inner panel and the necessary reinforcements by following the Master section

mentioned with the design parameter

explained in the videos. assembly of Hood

inner panel, outer panel, latch, hinge and

the reinforcements

Inputs:-

Master Section of Outer & Inner Panel Assembly

A car hood, also referred to as a bonnet in some other countries, is the hinged cover that rests over the engine of a front-engine vehicle.

Its purpose is to provide access to the engine for repair and maintenance. A concealed latch is typically used to hold down the hood.

On vehicles with an aftermarket hood and on racecars, hood pins may be used to hold down the car hood. Hoods sometimes also contain

a hood scoop, wiper jets, power bulge, and/or hood ornament. Car hoods are typically constructed from steel and sometimes from aluminum.

Aftermarket car hoods may be constructed from various other materials, including carbon fiber, fiberglass, or dry carbon.

Steps for CAR HOOD DESIGN :-

1.Design Outer Panel with the Hem.

2.Develop the Inner Panel.

3.Develop all the Necessary Reinforcements.

4.Mirror and position the Hinge & Striker.

5.Provide Mastic Data.

6.Provide the required Emboss definition.

7.Develop a detailed Report for the Mastic position and Embosses you have placed.

A hood ornament (or bonnet ornament in Commonwealth English), also called radiator cap, motor mascot, or car mascot

is a specially crafted model which symbolizes a car company like a badge, located on the front center portion of the hood. It has been used

as an adornment nearly since the inception of automobiles.

Hood Assembly Consists of following parts:-

1.Hood outer panel
2.Hood inner panel
3.Hinge assembly
4.Striker assembly
5.Hood thickness-
Outer panel thickness= 0.75 mm
Inner panel thickness= 0.75 mm
Reinforcement thickness= 1.5 mm

Inner Panel:-

In the inner panel only we can research & implement the safety of pedestrians & as well as the driver. In this panel only we can attach

the reinforcement, embossed, mastic points etc.
It is an object of the present invention to provide a hood inner panel capable of reduction of a reaction force of the hood inner panel even

if a level of deformation of a hood of a vehicle increases, & ensuring a sufficient energy absorption capacity.

Outer Panel-

We can also call it as cover of inner panel. It is the part, which gives luxurious look to the hood or bonnet

Outer & inner panel can not join by any welding process like spot welding or rivet, which spoil the outer

look of a car. The outer panel is generally extracted model from the prototype design

Hinge Assembly-

Hinge is a component that fixes the hood to the fenders of the car. The latch must be fixed perpendicular to the hinge axis so that the hood opens or closes properly.

Striker Assembly-

Latch & striker is used for locking the hood with the car. It is usually placed on the space provided on the inner panel.

The process involved in designing hood as a sheet metal operations is
Blanking
Hemming
Punch cutting or piercing
Deep drawing
Embossing
Hemming-

Hemming-
Hemming is a sheet metal forming process in which sheets are joined by bending it usually to 180 degree. Automotive body panels & parts

such as deck-lids, trunk-lids, doors, hoods & tailgates are formed by hemming processes.
Roll hemming is carried out incrementally with a hemming roller. An industrial robot guides the hemming roller & forms the flange. Roll

hemming operation can also be divided into several pre-hemming & final hemming process steps.
Conventional die hemming is suitable for mass production. In die hemming, the flange is folded over the entire length with a hemming tool.

Normally the actual hemming is a result of a forming operation in which the flange is formed with a hemming tool after the drawing & trimming

operations have been completed.

While doing the hemming process a relief angle is formed as a product of hemming when attaining at the corner of the sheet.

Conclusion:-

We have designed a hood that falls under the rules & regulations of the manufacturer's standards