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PRESENTED BY:-
CHANDAN KUMAR
ME-4th yr.
(1164040014)
•Introduction
•Shaft
•Axle
•Important parts of shaft and axle
•Traction Motor
•WAP- 4 Characteristics.
• WAG- 7 Characteristics.
•Shaft failure condition
•Shaft failure due to stress concentration factor.
•Preventive measure ensure
Industrial training
Electrical Loco Shed, Kanpur
INTRODUCTION
o ESTABLISHMENT
o The Electric Loco Shed, Kanpur was established in 1965 with the
Electrification of Mughalsarai-Kanpur section. The shed started
functioning with a meager holding of 11 imported WAM-1 type
locomotives for Passenger services.
o It’s main purpose is of maintenance of
o WAP1,WAP4,WAP5,WAP7 ,WAG5, WAM4 engines.
o INITIAL COST
o Rs. 1.5 (IN CRORES)
o PRESENT LOCO HOLDING
o 201,(43-WAP4, 153-WAG7, 02-WAG-9 & 3-WAM4)
• A long cylindrical device such as a rod or pole. On a wheel, the shaft extends
from the centre of the wheel along its axis.
• Used to connect other component of a drive unit train, can’t be connected
directly.
• Shafts are carries of torque.
• Subject to torsion and shear stress.
• A circular cross-sectional member supports gear, wheel, rotor etc. subjected
to torsion.
• Axles are made from SAE grade 41xx steel (chrome molybdenum) or SAE
grade 10xx (carbon steel).
• The primary difference between both materials are that chrome
molybdenum is more resistant to bending or braking but it is very difficult
to weld.
Bearing- Tapered roller bearings are bearings that can take large axial forces
(i.e., they are good thrust bearings) as well as being able to sustain large radial
forces.
Wheel- A train wheel or rail wheel is a type of wheel specially designed for
use on rail tracks. A rolling component is typically pressed on axle and
mounted directly on a rail car or locomotive or indirectly on a bogie, also
called a truck wheels.
Spindle- A short shaft such as line shaft, head shaft, stub shaft, transmission
shaft, counter shaft, and flexible shaft.
• An electric motor providing the primary rotational torque of a machine.
• Traction are used to provide electrically powered in rail vehicles.
Model NO. HS-15250A
Capacity 630 KW
Rating Const
Voltage 750 V
Excitation Series
Current 500A
Cooling air 80 m3/min
Speed 895 rpm
Poles 6
TYPES OF LOCOMOTIVE WAP-4
Gauge 1676 mm
Wheel arrangement co-co
Service Passenger
Rating of traction motor 630kw, 750v, 500A,
895 rpm
Gear ratio 23/58
Max Speed 140km/hr
power of locomotive 5060hp
Length of loco 18794mm
Total wheel base 14595mm
Bogie wheel base 3895mm
Width of loco 3055mm
Weight of loco 112.8+-1% tones
Height of sander 60mm
Type of locomotive WAG-7
Gauge 1676 mm
Wheel arrangement Co-co
Service Goods
Rating of traction motor 630kw, 750v, 500A,
895 rpm
Gear ratio 16/65
Max. speed 100km/hr
Power of locomotive 5000hp
Length of loco 20394mm
Total wheel base 15690mm
Bogie wheel base 3800mm
Width of loco 3179mm
Weight of loco 123+-1% tones
Height of sander 60mm
• TM Pinion teeth broken & seizer
• Axle box bearing seizer
• Tapper rolling bearing seizer
•Surface finish is important.
•Tool marks and very shallow grooves increase the stress very significantly.
•Welding, brazing, arcing or weld splatter produces stress concentration of the some type fractures originate from such points.
•Modern machine shafts have many changes in section, grooves, etc.
•Actual stress is many times higher than the stress calculated by simple bending or torsion theory.
•All such features develop stress concentration at concave corners.
• Ultimate tensile strength, endurance limit, elongation, surface hardness of the shaft are all within the limits specified in the drawing.
• Highly stressed components are not allowed to corrode or rust.
• Introduce ultrasonic and dry penetrate tests (DPT) as may be convenient and practicable to detect shafts with incipient fatigue cracks.
• Examine the fracture aspects of every failed shaft very carefully.
• No tool marks (grooves, scratches etc.) in highly stressed zones of shafts.
REFERENCES
Manufacturing Science - By A. Ghosh
Production Technology - By R.K Jain
