TYRE LIFE MANAGEMENT SYSTEM

GROUP – I

ALLU NARENDRANATHANSHUL MISHRAASHISH KUMAR PATLEASTHA TIWARINEELANJAY SAHAPALLAVI DANGERITWIK PANDEY

INTRODUCTION

1. Technical terms associated

2. Tyre repair methods

3. Operators role

4. Data analysis

5. Tyre management software

TERMS ASSOCIATED WITH TYRES

1.Tyre Type

2.Tyre width

3.Wheel Diameter

4.Load Index

5.Speed Rating

6.Side Wall

7.Bead

8.Carcass play

9.Crown Plies

10.Tread

TYPES OF TYRES

Tyres are classified into two types. They are

1.Tube Tyres2.Tubeless Tyres

Based on the principle of construction tyres are classified into 1.Radial Tyres2.Bias Tyres

In NMDC Tubeless Tyres are used in Heavy Earth Machinery like Dumpers, Loaders, Wheel Dozers.

THE BIAS TYRE

The casing is made up of several plies in acriss cross manner.

THE RADIAL TYRES

The casing made of single ply of steel cords.

The crown isconsolidated by a beltmade up of several piles.

TYRE REPAIR METHODS

There are three methods used during the tyre repair.

These are

1. Plug method

2. Filler method

3. Patch method

Bridgestone India Limited is against the recommendation of patch method.

Still the method is preferred in the project when compared to the other two methods.

EFFECTIVE TYRE USE

In order to permit the effective utilization of tyres, selection should be done properly according to the operating conditions and the type of vehicle on which they are intended for use and then mounted, used and maintained properly.

FACTOR PERSON RESPONSIBLE

1.Correct inflation pressure Tyre mechanic

2.Specified load Operator

3.Prescribed vehicle speed Operator

4. Full Haul road maintenance

Hall road operator staff.

TYRE INFLATION PRESSURE

Tyre serviceability depends upon the inflation pressure and maintaining the inflation pressure depends upon the tyre staff and tyre incharge. According to the operating conditions tyre inflation pressure is recommended by the tyre manufacturer .

Ex:85 Ton Dumper (27×R49) tyre1. Cold inflation pressure - 100 Psi2. Hot inflation pressure - 110 Psi

TYRE INFLATION EFFECT

Life

of

the t

yre

Cut, Burst

Measure the cut depth

Inspect the Air pressure

Serviceable

Rock pierce in the rubber

Remove the object.

Repair if necessary.

Inspect the Air pressure.

Serviceable

Swelling Tyre

Not repairable and the Tyre has to be scrapped.

Non-Serviceable

Rubber Chunks Out

Improve Road conditions

Rotate or Reverse Tyres

Avoid rough driving

Serviceable

Minor or severe cracks

Continue to use

Ensure adequate pressure

Inspect

Serviceable

Tyre burst from shock or cutting.

Scrap TyreUn Serviceable

SPECIFIC SPEED

The speed of the vehicle depends upon the operator. For the economical use of the tyres the tyre speed should be kept within the permissible limits so that the tyre life can be extended.Phenomenon Resulting damage

1.Higher heat generation inside tyre.

Heat damage.

2.Increased abrupt braking. Chipping and bead damage.

3. Obstacles in the road Cutting, cut burst and bead damage

4. Sharp cornering Irregular wear, quick abrasion and bead damage.

WHEEL ALIGNMENT

Proper alignment is necessary for perfect wheel control , uniform tyre wear and safety. When vibrations and vehicle pulling to one side or the tyre is wearing unevenly the vehicle alignment is to be checked. Steering, suspension components, wheel assembly is to be checked instead of charging only the suspension cylinder when the above cases occur. Tyre rotation pattern should be as per the manufactures considerations otherwise uneven wear happens on the tyres.

CORRECT LOADING

Avoid unbalanced loads.

Protect tyres from falling stones during loading.

When loading with a shovel, keep the prescribed rate of loading and considering the weight distribution aspect also.

EFFECT OF LOAD ON TYRE PERFORMANCE

REPAIRING AND RETREADING

1. Only cut and cracked tyres are repairable.2. Tyres for possible retreading must have

more tread left than that on the normally worn out tyres for protecting the casing.

3. An overhead casing is a poor prospect for retreading.

4. Tyres damaged by heat and bursting as well as damaged on the bead can neither be repaired nor can be retreaded.

TYRE ABRASION

The degree of tyre abrasion is measured by comparing the groove depth of the used tyre to the new tyre. The difference will indicate the rate of wearing.

Mean tread depth is to be calculated. Depth guage is used for this purpose. Depth guage positioning differs in lug pattern and traction pattern.

SHOVEL OPERATOR ROLE IN TYRE MAINTAINANCE

1. Avoid bucket spillage

2. Centering the load in the dumper

3. Avoid overloading

DUMPER OPERATOR ROLE IN TYRE MAINTAINANCE

1. Slow down on sharp turns.2. Avoid backing of rocks at shovel and dump

areas.3. Analysis of cut tyres indicate the tyres are

damaged during 9:00 PM to 5:00 AM mainly due to the poor visibility and inadequate lightning.

4. Keep the wind shields, rearview mirrors and headlights clean for good visibility.

5. Running on improperly inflated tyres should be avoided.

DOZER OPERATOR ROLE IN TYRE MAINTAINANCE

1. Spillage from the end of blades in road dump areas to be avoided.

2. Avoid exposure of rocks while crating the haul roads which can damage the tyres.

3. Wheel dozer operators can perform very valuable service in reducing tyre cuts by avoiding wheel spins as it cut treads.

MOTOR GRADER OPERATOR ROLE IN TYRE MAINTAINANCE

1. Good grading to remove all the rocks from the haulage roads.

2. Never leave high windrows which contain rocks if dumpers must cross them.

3. Haulage road must be without dips because dips in haul roads with 30 KMPH speed of haulage dumpers can increase the dynamic load by 1.5 to 3 times the tyre load rating.

WATER SPRINKLER OPERATOR ROLE IN TYRE MAINTAINANCE

1. Avoid over watering, because it exposes rocks in the haulage road creating tyre cutting conditions. Wet rubber cuts up to 50% easier than the dry.

2. Avoid slick surfaces because the dumper operators can lose vehicle control from skids, wheel spin and ineffective braking.

AVERAGE NEW TYRE LIFE (IN HOURS) TYRE SIZE 21.00R35 (Water Sprinkler)

TYRE SIZE 27.00R49 (Dumper)

TYRE SIZE 18.00 R25 (Motor Grader)

MAKE 2008-09

2009-10 2010-11 2011-12

MRF 3000 3195 2700 NA

BRIDGESTONE 3815 4005 NA NA

GOODYEAR 2800 NA NA NA

MAKE 2008-09

2009-10 2010-11 2011-12

MICHELIN 5270 6034 5550 4776

BRIDGESTONE 6056 5467 5457 5890

GOODYEAR 6522 NA NA 5770

MAKE 2010-11 2011-12

JK TYRE 2112 2300

AVERAGE LIFE COMPARISION OF NEW AND RETREADED TYRES(2011-12)

SIZE 27.00×49 (Dumper)

SIZE 35/65-35 (Front End Loader)

MAKE AVG LIFE(NEW)

AVG LIFE(RETREADED)

MICHELIN 4776 5597

BRIDGESTONE 5890 4817

MAKE AVG LIFE(NEW) AVG LIFE(RETREADED)

BRIDGESTONE 4528 8919

ANALYSIS OF TYRE DAMAGE

Reason for removal 2008-09 2009-10 2010-11 2011-12

Side wall cut 17.02% 16.67% 65% 44.4%

Burst 31.91% 50% 35% 11.11%

Inner ply separation 29.79% 16.67% 0 37.03%

Outer ply cut 21.28% 16.67% 0 7.4%

BREAKDOWN DISTRIBUTION

2008-09

2009-10

2010-11

2011-12

0

10

20

30

40

50

60

70

Sidewall cutBurstInner ply sepera-tionOuter ply sepera-tion

Perc

en

tag

e d

istr

ibu

tion

TYRE LIFE MANAGEMENT SOFTWARE

Tyre life management software helps in managing tyre status and tyre performance reports.

Advantages:1. Tyre report can be made in the required

format like according to the make wise, size wise or tyre type (new or retreaded)

2. HMR updating option will be there for the Tyres of each particular dumper.

CONCLUSION

Implement the kaizen improvement techniques.

Maintaining proper inflation pressure. Operators role. Tyre life management software.

THANK YOU