Hood design-Week 2

HOOD :

Hood is a one of the component of a car and also iimportant component. It is mountained on the engine compartment which is used to cover engine. It is a opening body part, the hood consists of an outer panel and inner panel which is joined together with help of hemming operation. The inner panel provides the strength of the hood and outer panel is covering unit and also styling unit.

DESIGN :

Mater section :

Given thicknesses of hood are

• Outer Panel Thickness = 0.75mm
• Inner panel Thickness = 0.75mm
• Reinforcement Thickness = 1.5mm

The four main parts of the hood assembly are

• Outer Panel
• Inner Panel
• Latch and Striker and
• Hinge

OUTER PANEL

We recive the skin of the hood outer panel with required design and dimentions. The sahpe of the outer panel is aerodynamic used for reduce the air effect. It is a coveing unit and it has less strength when compare with the inner panel.The hood outer panel does not required the embosses to provide the stregnt. This skin of the hood outer panel is used to design the inner panel.

INNER PANEL

The inner panel is developed by using the skin of the outer panel and is strengthening part of the hood. It has a lot of embosses which can be made the inner panel became strength. The outer panel and inner panels are joined together by using of hemming operation at the edges. And it has a mounting places of striker and the hinges at the required places.

LATCH AND STRIKER

It is the system of that used to opening and closing the hood perfectly. The latch is placed on the inner panel which is perpendicular to the hinge axis. The latch and striker system provides that your hood securely connected to your vehicle which is does not open unexpectedly. No need to operate the hood opening and closing when tha latch and striker system there. When the hood is locked state, it must remain locked and only unlock when we required by operating the opening button.

HINGE SYSTEM

The hinge assembly consists of two parts, one is connected to the hood inner panel and other one is connected to the engine compartment. Hinges are used to hold the hood when it is opening condition and closing condition

LATCH TRAJECTORY

The mounting place of the striker is can be easily find by using this latch trajectory system. A circle is drawn by using the hinge axis at the mid point. By this circle we can place the latch at required place. The position of the latch and striker follows the path of the this circle.

MASTIC DATA

Matic data is nothing but the mastic sealants with the material of rubber like elastic compound. Matic sealants are placed between the hood outer panel and inner panel. The hood outer and inner panels are joined together with less gap by hemming operation which is does not required spot welding or riveting there. And this sealants are used to fill the gap between the hood inner and outer panels. By using this mastic sealants helps to reduce noise between two attached components.

EMBOSS DEFENATIONS

Embosses are used to increase the strength of the sheet metal. The shape of the embosses are used to direction of opposite force ditribution. There is a lot designes of the embosses to distibute the force towards the hinges side.

HEMMING

Hemming is the process of sheet metal forming which sheets are joined by bending. The hemming process is mostly used in the final stage of the prodution of automobile parts like hood, door etc It is used where the welding and riveting processes are does not required for stylin purposes.

DEEP DRAWING

Deep drawing is a form of metal forming, where rigid tools such as pinch dis and blank holders are used. the blank is placed between the die na d the holder and then deformed by the punch pushing the sheet into the die and the blank finally assumes the shape of the die. The metal palte is fixed between the die and the holder before processing begins, this prevents the fomration of undesired deformations such s wrinkles. Deep drawing changes metal sheets into curved parts or create cuved parts with smaller diameter from already curved detailes.Often a series os deep draws are done to achieve the final shaoe.

HOOD ASSEMBLY

The hood assembly is done by following the master section by using the NX software.