Week 1:- Introduction to BiW and Fixtures Challenge

1. What is BIW & its parts?

BIW, or Body in White, refers to the stage in automobile manufacturing where the car body's frame is assembled but not yet painted or equipped with components like the engine, chassis, or trim. It includes welded sheet metal components that form the vehicle's structure. Key parts of BIW include:

• Roof Panel

• Side Panels

• Floor Panel

• Hood

• Trunk Lid

• Doors

• Pillars (A, B, C, etc.)

2. BIW Nomenclature

BIW nomenclature involves the naming conventions and terminology used to describe various parts and features of the car body. It includes terms like:

• Pillars (A, B, C): Structural supports for the roof.

• Sill: The lower part of the car body.

• Firewall: A panel separating the engine compartment from the cabin

Function:
1 Separates the engine compartment from the passenger compartment.
2 Provides a barrier against fire, heat, and fumes.
3 Reduces engine noise.

• Wheel Arch: The curved section above the wheels. This nomenclature ensures consistency and clarity in design and manufacturing.

3. What is a Fixture & its Types?

A fixture is a device used to hold, locate, and support a workpiece during manufacturing processes like welding, drilling, or machining. Types of fixtures include:

• Welding Fixtures

• Drilling Fixtures

• Milling Fixtures

• Assembly Fixtures

• Inspection Fixtures

4. Basic Principle of Fixture Design

The 3-2-1 Principle is the foundation of fixture design. It involves:

• 3 Points to locate the workpiece on a primary plane.

• 2 Points to restrict movement on a secondary plane.

• 1 Point to fix the position on a tertiary plane. This principle ensures stability and precision by restricting all six degrees of freedom.

5. Types of BIW Stations

BIW stations are categorized based on their function in the assembly line:

• Geo Station: Defines the geometry of parts through precise welding or riveting.

• Respot Station: Completes leftover welding or riveting.

• Pedestal Station: Uses a pedestal-mounted tool for welding.

• Loading Station: Loads panels and adjusts their orientation.

• Marriage Station: Joins the car body with the chassis.

• Sealing Station: Applies sealants for waterproofing.

• Curing Station: Cures adhesives or coatings.

6. Basic Terminologies in BIW Fixture

Common terms include:

• Mylar: Blocks that hold or clamp panels in place.

• Pin: Used to lock rotational movement of panels.

• Blade: Supports the panel during operations.

• Riser: Elevates components to the required height.

• Shimming: Adjusts gaps for better fit and alignment.