The document provides information about National Bearing Company (NBC). It discusses the different types of bearings NBC manufactures, including ball bearings, tapered roller bearings, cylindrical roller bearings, and spherical roller bearings. The document outlines the manufacturing process for ball bearings at NBC, including steps like forging, heat treatment, grinding, and assembly. It also discusses features and applications of ball bearings.

1. 1A presentation
On
NATIONAL BEARING COMPANY
CHIRAG JOSHI
BY

2. Contents
 About NBC
 Introduction to Bearing
 Types of Bearing
 Ball Bearing
 Construction of Ball Bearing
 Manufacturing Process of Ball Bearing
 Features of Ball Bearings
 Types of Load and Load Equations
 Applications of Ball Bearings
2

3. Company Profile
 NBC Bearings is the product of National Engineering Industries Limited
(NEI), a part of the CK Birla Group, which manufactures a wide range of
bearings for the automotive, industrial and railways
 NEI manufactures bearings in about 1000 different sizes
 It has the capacity to develop bearings from 10 mm bore to 2000 mm
outer diameter.
 NBC’s current capacity is to make 100 million bearings annually across its
three plants (Jaipur, Newai, Manesar). NEI aims to double the production
capacity in next seven years
3

4. Introduction to Bearings
 The term "bearing" is derived from the verb "to bear"; a bearing being a
machine element that allows one part to bear (i.e., to support) another
 A bearing is a machine element that constrains relative motion to only the
desired motion, and reduces friction between moving parts
 Objective of bearing is to provide relative positioning and rotational
freedom while transmitting a load between two parts.
 It needs a good support to ensure stability and frictionless rotation.
4

5. Types of Bearing 5
Ball Bearing
Tapered Roller Bearing
Cylindrical Roller Bearing
Spherical Rolling Bearing

6. Ball Bearing
 A ball bearing is a most common type of rolling-element bearing that uses
balls to maintain the separation between the bearing races
 Precision Ball Bearings from 6 mm bore to 75 mm bore diameter are
manufactured in NBC
 This Division is spread over a covered area of 14,694 Sq. Meters
6

7. Tapered Roller Bearing
 Can take large axial forces as well as being able to sustain large radial
forces.
 Based on the observation that cones that meet at a point can roll over
each other without slipping.
 Generally separable, which means the cone assembly, consisting of the
inner ring with roller and cage
 Precision Ball Bearings from 17 mm bore to 100 mm bore diameter are
manufactured in NBC
7

8. Tapered Roller Bearing Cont.… 8

9. Cylindrical Roller Bearing
 Have a high radial load capacity and are suitable for high speeds
 Precision Ball Bearings from 20 mm bore to 75 mm bore diameter are
manufactured in NBC
 Cylindrical bearings provide the highest possible radial load capacity
compared to other roller bearing types
9

10. Spherical Roller Bearing
 Spherical roller bearings are self-aligning bearings designed for heavy
radial loading.
 Precision Ball Bearings from 50 mm bore to 200 mm bore diameter are
manufactured in NBC
 A spherical roller bearing is a rolling-element bearing that permits rotation
with low friction, and permits angular misalignment
10

11. Assembling of Ball Bearing 11

12. Rolling vs. Sliding Friction 12

13. Manufacturing Process 13
Ball forging
Tube extrusion
Heat
Treatment
Ball
manufacturing
Race
Grinding
Assembly
Finished goods
Warehouse &
Shipping
Bought out
component
Turning

14. Manufacturing Process Cont.…
 CARBURIZATION
 Carburizing is a is a heat treatment process in which iron or steel absorbs carbon
liberated when the metal is heated in the presence of a carbon bearing material,
such as charcoal or carbon monoxide, with the intent of making the metal harder.
 The carburizing is performed 940º to 980ºc in rotary hearth furnace with time of
10hrs. But carburizing is done for only cup and cone with Air: LPG =10:1 (Endo
Gas).
14

15. Manufacturing Process Cont.…
 QUENCHING
 Quenching is a process of cooling a metal at a rapid rate. This is most often done
to produce a marterialistic transformation. In ferrous alloys, this will often produce
a harder metal, while non-ferrous alloys will usually become softer than normal.
 In NBC Oil is used in the quenching process and the oil is kept at a temperature of
250C. Agitator is used to stir the oil in the oil quenching tank.
15

16. Manufacturing Process Cont.… 16
Stress Reliving

17. Interesting Facts
 If you were to file down onto a ball bearing, you would wear out the file
before you would wear out the bearing!
 If you were to expand a 1-inch ball to equal the size of planet Earth, the
ball would be rounder than the actual Earth
 The Hubble telescope, weather satellites and even the Mars Space Rover
all use bearings.
 When using outer race rotation, you are reducing your bearing lifespan by
20%
 70% of bearing failures are from improper lubrication
17

18. Features of Ball Bearing
 Can be used under wide range of temperature
 Internationally available and available.
 Maintenance, replacement, inspection are easy
 Cheap
 Have great rigidity and are robust
18

19. Applications of Ball Bearing 19
 In horology, the company Jean Lassale designed a watch movement that
used ball bearings to reduce the thickness of the movement
 Aerospace bearings are used in many applications on commercial, private
and military aircraft including pulleys, gearboxes and jet engine shafts
 Skateboard wheels each contain two bearings, which are subject to both
axial and radial time-varying loads

20. Types of Bearing Load
 Bearings typically have to deal with two types of load:
 Radial Load
 Axial Load (Thrust)
 RADIAL LOAD act at right angles to the shaft (bearing's axis of rotation)
 AXIAL LOAD (Thrust) acts parallel to the axis of rotation.
20

21. Types Of Bearing Load Cont.… 21
The bearings in the electric
motor and the pulley pictured
above face only a radial load.
In this case, most of the load
comes from the tension in the
belt connecting the two
pulleys.
The bearing above is like the
one in a barstool. It is loaded
purely in thrust, and the entire
load comes from the weight of
the person sitting on the stool.
The bearing above is like the
one in the hub of your car
wheel. This bearing has to
support both a radial load and
a thrust load. The radial load
comes from the weight of the
car, the thrust load comes from
the cornering forces when you
go around a turn.

22. Load Equations
 Relative axial load = (Fa/ZDw )
 Fa = Axial Force
 Z = Number of balls
 Dw = Ball Diameter
 Relative radial load = (MF/R)
 M = Torque
 R = Radius
 F = Load Connection Factor
22
F = Load Connection Factor
Single Chain Drive 1.00
Timing Belt Drive 1.10
Spur, Helical Gear 1.25
Double Chain Drive 1.25
V-Belt Drive 1.50
Flat Belt Drive 2.50

23. 23