Week 1:- Introduction to BiW and Fixtures Challenge
1.What is BIW & define its parts.
BIW is the stage in automotive manufacturing in which parts of automobile parts created out in stamping or any other operation are welded together.The other componenets like engine,interior and exterior trims and chassis are joined to it.
various parts of BIW are given below.
a.Body sides.
1.Body side under.
2.Body side inner.
b.Under body.
1.front end under frame.
(Engine compartment).
2.Main floor.
3.Rear end under frame.
(Rear compartment).
c.Closures.
1.Doors.
2.Rear door.
3.Hook.
4.Lid.
d.Roof.
1.roof inner
2.roof outer.
e.Fender.
2.
3.Fixtures.
Fixtures are required to hold and locate different automobile parts in correct dimensional tolerance so that the required manufacturing process will be completed .The principle used in fixture design is generally 3-2-1 principle.BIW fixtures are used for clamping and holding the automobile parts in proper way so that reultant assembly is proper.
Production fixtures.
Production fixtures are used for purpose of increasing quality and efficiency in production .
manufacturing fixtures.
Manufacturing fixtures are used in machines for purpose of clamping intricate parts in machines for locating and ease of manufacturing.
a.Types of fixtures.
1.BIW fixtures.
a.They are generally used for welding and fixing the automobile parts with the use of welding or other process.
2.Checking fixtures.
They are process hardened and dimensionally sound fixtures used for purpose of checking the products or processes
3.Production fixtures.
The production fixtures are generally used for purpose of installing on machines for fixing the part on it.
4.Principle in fixture Design.
The main principle used in fixture design is 3-2-1 principle.
Where the translational and rotational degrees of freedom of part are arrested and fixed.
5 .Types of BIW stations.
The biw is located in such a way that whole operation is distributed in zones and zones are classified in stations and each station has units and tools ,stands and gripper.
Types of BIW stations.
Tools.
Different parts are held together for manufacturing operation
In geo tool fixture the the different parts are attached together by using these fixture.
Respot tools.
All operations cannot be performed on one station so certain operatons are performed at other stations.so respot tools station are
Marriage tools.
THESE TOOLS ARE GENERALLY USED FOR PROCESS OF JOINING THE PARTS WITH EACH OTHER.They can be welding or gluing or other tools used for ancillary purpose.
Gripper
They are generally used to hold the part so that corresponding operation can be performed to hold the parts or car panel.
Material handling Gripper.
Process Gripper.
Combo Gripper.
Dual Gripper.
Stands.
Stands are used for holding the operation equipment or mylars.
Types of stands.
Gluing Stand.
Docking stand.
Date stamp stand.
Pedestial stand.
Miscellaneous stand.
Curing stand.
6.BIW fixtures Basic terminologies.
1.NC/MYlars/Fingers.
2.PLP(principal locating point).
3.Blade
4.Riser.
5Shim.
6.Rough locators.
7.Hardware.
8.C.M.M.
9.Units
10.Clamp unit.
11.Sensors.
12.Reed Switches.
Mylars;
Mylars are used tohold the workpiece.
PLP
The principle locating point are used for locating the workpiece properly so that it is fixed.
Riser.
It is used to increase or reduce heights of the fixture.
SHIM
They are used to compensate stack up clerance.
Rough locators.
They are used for locating the parts properly on the fixture.
Hardware.
The other accessories comes in hardware.
CMM.
It is used for checking geometric tolerance and co-ordinates of part.
Sensors.
It is used for restricting the motion.