Week 1:- Introduction to BiW and Fixtures Challenge

1.) WHAT IS BIW & DEFINE ITS PARTS?

• Body in white is refers to the welded sheet metal component which form the vehicle structure which the other component will be fixed.
• Biw means after welding, before painting body submerged into one liquid call primer it is in gray color.

BIW PARTS:

• Body sides----Body side outer, Body side inner
• Under body----Front end under frame, Main floor, Rear end upper frame
• Closures----Front door, Rear door, Hood, Deck lid
• Roof----Roo inner, Roof outer
• Fender

2.) WHAT DO YOU UNDERSTAND BY BIW NOMENCLATURE?

This are the basic name how they called.

• A - Inner wing panel
• B - Upper wing panel
• C - Suspension tower
• D - Upper A pillar
• S - Lower A pillar
• P - B pillar
• J - C pillar
• K - D pillar
• F - Roof

So this are some major parts form the BIW structure for the car body and ahow are they name in automotive industries.

3.) WHAT IS FIXTURE &ITS TYPES?

Fixtuer is a device to hold the workpiece to be processed

TYPES OF FIXTURE:

• Production fixture----Mass production
• Pre production operation fixture----Initial batch production
• Checking fixture----Car panel geometric inspection purpose

4.)WHAT IS THE BASIC PRINICIPLE OF FIXTURE DESIGN?

For the fixture design the major time is spend to deciding how to locate the work piece in the fixture.

For any free body there are total of twelve degrees of freedom.

a) 6 translational degree of freedom

b) 6 rotational degree of freedom

You must fix all degree of freedom in order to locate the work piece in the fixture. So the 12 degree of freedom of the work piece need to be fixed and we achieve the zero degree of freedom for the work piece.

5.)ELABORATE TYPES OF BIW STATIONS?

• Tools:

Tool is a fixture which contains number of units together to hold the car parts

Types:

1] Geo tool: It is a fixture in which the geomentry of the panels which are welded together is define accurately. The pin tolerance is 0.15

2] Re-spote tool: It is a fixture in which the remainig weld spot which are not achived in the geo tool are welded. The pin tolerance is -0.28

3] Marriage or Hemming: It is a fixture in which the inner pannel and outer pannel assembly are joined together.

• Gripper:

Gripper is a fixture which hold the car panels and is fixed in the d-end of the robot.Also known as EOAT- End Of Arm Tooling.

Types:

1] Material handling gripper: It is designed for handeling the car panel from one tool to other tool.

2] Process gripper:It is designed for handeling the car panel from one tool to other tool and addition to that it under goes process like welding, riveting, gluing.

3] Combo gripper: It is designed for handeling the car panel from one tool to other tool also combination of weld gun at another side of the gripper.

4] Dual gripper:It is designed for handeling the car panel from one tool to other tool with two side gripper.

• Stands:

1] Gluing and sealer stand: Gluing gun is fixed to a welded which is grounted to the floor permenantly.

2] Docking stand: When the robots for multi tasking like material handling and welding which cannot carry both. So the robot will drop and pick the gripper after completing some operation with the help of docking stand.

3] Date stamp stand

4] Pedestal gun stand

• Miscellaneous:

6.)WHAT ARE THE BASIC TERMINOLOGIES USED IN THE BIW FIXTURES?

• NC/Mylars/Fingers
• PLP
• Blade
• Risers
• Rough locators
• Hardwares
• CMM
• Units
• Number plate
• Name plate
• Pivot
• Sensors
• Class A surface