Bridgestone South Africa. Tyre Selection Tyre Maintenance and Support

Transcription

1 Bridgestone South Africa Tyre Demand Tyre Selection Tyre Maintenance and Support

2 Forecast and Demand Planning Forecasting for tyres is essential, especially when These items are in great demand The demand outstrips the supply The correct selection needs to be determined for optimum life Lead time is more than four months Forecast / Demand Simple calculations can prevent downtime Number of tyres per truck Number of trucks Hours Mine operated per year Average tyre life ours Planned stock holding on site by size 2/24

3 Forecast Number of Tyre per Total wheel Hours Mined Tyre Hours Demand Trucks truck positions Demand Stock on hand required Commen t 6 2 Matching Matching /24

4 Logistics Just in time Or not 4/24

5 Tyre Performance There are several Factors affecting a tyres performance on a Mine. These can be categorized into the following ; 1. Tyre Selection 2. Tyre Maintenance 3. Operating Conditions 4. Tyre Management The best tyre for a task or job is the correct tyre and needs to be selected carefully 5/24

6 Functions of a tyre There are four Main Functions of a Tyre. Supporting Load Absorbing Road Shocks Transferring Traction & Braking Forces to the Road Surface Changing and Maintaining Direction of Travel 6/24

7 Tyre Selection In order to select the correct tyre, we need to understand the meaning of the size and description of a tyre. Bridgestone's Off-the Road tyres are designed and produced to meet the commonly accepted international standards, those set by the TRA (Tyre and Rim Association) in the USA, by the ETRTO (European Tyre and Rim Tech. Organization) in Europe, the ATRA (Australian Tyre and Rim Association)and by the JATMA (Japan Automobile Tyre Manufacturers Association) in Japan. TRA-USA ETRTO-EC ATRA - AUSTRALIA JATMA - JAPAN 7/24

8 Tyre Selection Why are these important? TRA codes stamped on the sidewall of the tyre indicate the type of machine or vehicle to which the tyre is best suited. It is a two-part code. The first letter refers to the machine or vehicle, the number describes the general service to which tyre is best suited as well as its tread depth. 8/24

9 TRA Code - Applications E - TYPE TYRES L - TYPE TYRES G - TYPE TYRES Vehicle Distance (One Way) Maximum Speed E Earth Mover 5 km 50 km/h L Loader / Dozer 76 m 10 km/h G Grader Unlimited 40 km/h 9/24

10 Tyre Selection Size description 10/24

11 Tyre Selection Size description 11/24

12 Tyre Selection Size description Data Book Overall Width (OW) Section Width (SW) Tread Width Overall Diameter (OD) = Free Radius x 2 Free Radius Rim Flange Height Section Height (SH) Rim Width Nominal Rim Diameter Static Loaded Radius (SLR) Static Loaded Width (SLW) 12/24

13 Tyre Maintenance Maintenance of tyres has two main components. Tyre Maintenance Tyre Pressures Tyre Loads Tyre condition maintenance Vehicle Speeds Rotation & Matching Operating Conditions Haul-roads Distances Haul-roads Condition Width / Drainage Haul-roads - Underfoot conditions Inclines and Elevations 13/24

14 Tyre Maintenance Tyre Pressures Tyre and Rim To satisfy the four functions, the construction of a tyre must provide a strong air container. Highly compressed air in a container Pneumatic tyre 14/24

15 Tyre Trends Demand for Larger sized tyres Larger Chamber Volume Larger Tyre Carrying Capacity Potential Tyre Size Load Capacity 18.00R Kg 18.00R Kg 21.00R Kg 24.00R Kg 24.00R Kg 27.00R Kg 30.00R Kg 33.00R Kg 36.00R Kg 37.00R Kg 40.00R Kg R25 50KMPH / 102PSI 1800R33 Load Capacity (Thousand Kg) 2100R R R R R R51 CHAMBER VOLUME TYRE SIZE 3600R R R57 15/24

16 Tyre Maintenance Tyre Pressures % 100% 80% Ty yre Life OVER RECOMMENDED INF. PRESS UNDER 16/24

17 Tyre Maintenance Tyre Loads 120% Tyr re Life % 100% W W W OVER RECOMMENDED INF. PRESS UNDER 17/24

18 Tyre Maintenance Vehicle Speeds INDEX 100% 120% 100% Wear Tyre 75% 50% 0% 40km/H 50km/H 70km/H 90km/h 18/24

19 Maintenance Rotation & Matching 3% 19/24

20 Operating conditions Haul-roads Distances Vehicle Distance (One Way) Maximum Speed E Earth Mover 5 km 50 km/h L Loader / Dozer 76 m 10 km/h G Grader Unlimited 40 km/h 20/24

21 Operating conditions Haul-roads Condition 21/24

22 Operating conditions Haul-roads Condition Width Ideal 3.5 times truck width 22 22/24

23 Operating conditions Haul-roads Condition Drainage 23/24

24 Operating conditions Haul-roads Condition Drainage 24/24

25 Operating conditions Haul-roads Condition Width / Drainage 25/24

26 Operating conditions Haul-roads - Underfoot conditions 26/24

27 Operating conditions Haul-roads - Underfoot conditions Keep Graders busy 27/24

28 Operating conditions Inclines and Elevations 10 Mph = 16 Kph 20 Mph = 32 Kph 30 Mph = 48 Kph 40 Mph = 64 Kph 28/24

29 Operating conditions Inclines and Elevations Banking / Super elevation === Less than.2 Gs(Gravity) Lateral Stress 29/24

30 TKPH - Rating The TKPH (Ton/Kilometer Per Hour) is an expression of the working capacity of a tyre, it is also what the work site demands of the tyre. The TKPH is a function of the maximum allowed internal operating temperature of the tyre TKPH is ONE of several criteria used for selecting a tyre for a job site The TKPH rating for a tyre is dependant upon the design of the tyre and varies according to its size, tread pattern, and tread compounding TYRE CAPABILITY TKPH Rating = Tread Compound Tread Design Tyre Construction Tyre Size = Tyre Heat Dissipating Capability 30/24

31 TKPH - Calculation TKPH = Mean tyre load x Average work shift speed Mean tyre load = Tyre load empty + Tyre load laden 2 Average work shift speed = Round trip distance x Number of cycles per shift Total hours of operation per shift Mean Tyre Load Average Work Shift Speed 2 Total hours of operation per shift 31/24

32 Tyre Repairs Can we repair Off the Road tyres? Of course! Doing repairs to tyre is very common. The Tread, Shoulder and Sidewall are repairable. Benefit is using more of the tyre reducing scrap and costs! 32/24

33 Handling tyres CORRECT INCORRECT 33/24

34 Storage BEST WAY TO STACK TYRES - IN STOREROOM - IN TYRE RACKS - ARRANGED ACCORDING TO SIZE IF NOT MOUNTED ON A RIM ALTERNATIVELY - COVER TYRES FROM ELEMENTS SUCH AS RAIN & SUN IF MOUNTED ON A RIM - NOT MORE THAN THREE TYRES ON TOP OF EACH OTHER 34/24

35 Questions Thank you... 35/24