P.Siddhartha

11305044

Importance of wheel rims

Metals used to make

Different processes in use

Best method of preparation

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.

Consists of three parts

Wheel base

Rim

spokes

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

Follows 6 steps

1.making wheel disks

2.making wheel rim

3.assembling disks into rim

4.finishing

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 rim and disk both are allowed to finishing

Finishing gives a plain smooth view of rim and disk

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

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