presentation
TRANSCRIPT
The rim is the outer edge of a wheel, holding the tire It makes up the outer circular design of the wheel on which the inside edge of the tire is mounted on vehicles such as automobiles.
In the 1st millennium BC an iron rim was introduced around the wooden wheels of chariots.
Aluminium alloys and steel
Aluminium has better qualities than steel like
Strength
Heat resistance
Better breaking system
But cost is higher than steel
• Forging
• Casting
Forging has more advantages when compared to casting
Forged rims can bear heavy load
Forged wheels are free from pores and cavities
Forged rims have better mechanical properties
initially pressures applied flat disk
by some series of
presses
first press gives the center of disk
For 1 inch 16 gauge steel 5 tons of
Pressure is required
The windows are cut in disk by
second pressing on the rim
Windows give good look and
Strengthen the disk
By third pressing the disk is
made into bowl shape and has
particular angles for particular designs
Holes are made around center disk
to mount it on vehicle
The sheet metal is rolled
by cold rolling process to remove
excess material
Then sheet is rolled into circular ring and
egdes are joined by welding
The excess welding wastes are
scratched out
The rim is forged into curved shapes
by using high pressures
Then the rim is shaped by a series of
rollers to provide the rim a bead seat
to hold the bead wall of tire
The disk is placed in rim and a high pressure is applied on disk to get fit into rim
Then the contact of both are welded together
It may be carried out by automated machines or by manual
In automation the laser detects the flaws
In manual a marking block is used to check the perfect spherical shape rim
There is a wide range of applications for wheel rims especially in automobiles,they are heart of automobile industry
Instead of rims it is impossible to have great grip on wheels and braking systems
Even bicycles , motor cycles have rims as per the size and shape of design
Rails run on rail road on these rims which are more stronger than actual rims