BIW

(BODY IN WHITE)

PRESENTATION BY

K. AJAY KUMAR

CONTENTS

1.Introduction2.Purpose of Body design3.Classification4.Description5.Reinforcement6.Factors Affecting BIW

Introduction

What is BIW?

BIW stands for Body in white.

A Body in white is an assembly of a frame and panels, made up of homogeneous materials (for instance, steel or aluminum sheets or composites).

A. 1)Body in white steel sheets and 2)roof panel of Fiat Stilo 3-doors,before their assembly.B. Audi A2 aluminum body frame.

BIW mainly refers to:

• Body in White or BIW refers to the stage in automobile manufacturing in which the car body sheet metal (including doors, hoods, Trunks, bumpers and deck lids) has been assembled but before the components (engine, chassis, exterior and interior trim i.e. door coverings, roof liners, carpets, seats, electronics, plastic trim parts) have been added.

Purpose of Body design• Aesthetics:

To provide a pleasing overall appearance, surface quality and consistent details.

• Structural function:To support the weight of the transported passengers and load as well as the mechanical parts required for vehicle propulsion, control and other system functions, so withstanding mechanical stresses from multiple sources.

• Ergonomy and roominess:To supply easy access and adequate room for the driver, passengers and transported goods.

• Safety: To ensure integrity of passenger compartment in the event of a crash, while absorbing the impact energy as well as to reduce injuries to vulnerable road users (pedestrians, wheelers), in case of collision.

• Aerodynamics: To minimize drag due to air impact; to control air flow effects on tyre-road contact and vehicle stability.

• Insulation: To minimize noise, vibration and thermal transmission, generated by body walls, by lack of sealing between compartment and movable parts and by thermal radiation from the surfaces of passengers compartment.

• Visibility: To provide the highest possible day and night visibility on the environment and to host the lighting devices in the most effective way.

Over view of BIW

Motor Front

Torque Box CompartmentUpper Rail

FBHP(Front Body Hinge Filler)

Rocker

Upper Tie Bar

Lower Tie Bar

Wheel House

Shock Tower

Roof Side Rail

Wheel House Roof Bow Rear Header / Hatch Header Rear End Panel

C- Pillar

Quarter Panel

Body Lock Pillar

A-Pillar Header

W/S Header

Plenum

B- Pillar

Lower Rail

Dashtunnel

Classification

There are two kinds of body structures in use:-

1. Monocoque Body Structure

2. Frame mounted Body Structure

DescriptionMonocoque Body Structure:-

In Monocoque Body, Chassis is in built in the BIW itself. And there is no separate chassis. Wheels are directly mounted to the BIW with the help of suspension

system.

Frame Mounted Body structure :-

In the Frame Mounted system body is mounted on the separate Chassis/Frame.

And wheels are mounted on the Chassis not to the body.

Monocoque Body structure

Frame Mounted Body Structure

BIW Structure can be divided into following sub structures:-

› Under Body Structure› Front End Structure› Body Side Structure› Closures› Roof

All those substructures consists of the following major panels:-

An Under Body Structure :-Dash panel-provides partition b/w engine and the driver cabin.FRT floor - provides base for seats.Raiser - connects front floor to rear floor by providing level difference.Rear floor - floor on the rear of the car and provides partition from ground and

base for rear seatsRear wheel house

Front End Structure :-Plenum Panel- a chamber located b/w the throttle body and runners of the intake manifold.

FRT wheel house(Fender)- is an encasement around the frt wheel.Wing panel - outer most side panel in the front .Cowl -portion of the body bounded by the front fenders, the base of the windshield, and the rear edge of the hood.

Upper tie bar -upper panel in front connecting the two sides of front structure.Lower tie bar- lower panel in front connecting the two sides of front structure.

Body side Structure:-A- pillar - front most support to the roofB- pillar - second support to the roofC/D pillar - c- is rear most support to roof in case of two row seating

system, it will be third one. D- is the fourth support usually rear side of quarter panel.

Ring panel - a structure panel connecting the rear and front portion.Quarter panel - rear most panel of a body side structure.Drip rails / Gutters- an exposed channel applied to the roof over the side windows

to direct water away from the windows. Closures :-

All doorsHoods/Bonnet -a hinged panel providing access to the engine compartment.

Roof Structure:-RoofHeaders - structural member above the windshield at juncture

with the forward edge of the roof panel.Bows

Reinforcement component

The part which are used to support and provides stiffness and strength to other components of BIW.

Factors affecting design and construction of BIW:-

Thank

you