This ppt gives information about the national bearing corporation popularly Knows as NBC bearing one of the coveted name in bearing industries.

1. “NATIONAL ENGINEERING
INDUSTRIES LTD.”
JAIPUR
By:
Ravi Vaishnav

2. Topics Covered :
 About the company
 Company’s milestones
 Technical Collaboration
 Departments in NBC, Jaipur
 Taper roller bearing(TRB) department(Allotted)
 Different processes under TRB department
 Suggestions
 Conclusion

3. About the company
• Established in 1946 by B.M. Birla
• Capacity – 3.8 million bearings per month
• Area – 4,78,900 meter square
• Bearing Range – 6mm bore to 1300 mm outer
diameter
• Nature of business – manufacturer ,exporter
• Exports to more than 21 countries
• Turnover (2012-13) – Rs1334 crores

4. Technical collaboration
o NTN Corporation of JAPAN
For Ball Bearings, Cylindrical, Spherical Roller Bearing &
Tapered Roller Bearings
o Izumi Kinzoku of JAPAN
For re-manufacturing, retrofitting and overhauling of Grinding
and Super-finishing machines for bearing races.
o BRENCO Incorporated of U.S.A.
For Cartridge Tapered Roller Bearings

5. NBC Products:

6. Departments in NBC Jaipur:
Ball bearing
Precision Ball Making
Tapered roller bearing
Railway bearing
Research and development
Large Dia Bearing
SAP- ERP

7. Overview of all departments:
• Ball bearing – range 6mm bore to 160 mm OD
and made three types of ball bearing-
(1) Radial ball bearing, (2) Single Row Angular
Contact Bearing & (3) Double Row Angular Contact
bearing
• Precision Ball Making– up to 25 mm dia and use
precision grinding and Lapping process to achieve
super finished surface
• Tapered roller bearing (TRB)– Two types of TRB-
Single row & Double Row Tapered roller bearing
and size varies from 15.857mm to 95.25mm bore

8. Continued…..
• Railway Bearing- Manufactures three types of
bearing-
(1) Cylindrical , (2) Spherical and (3) Cartridge Tapered roller bearing
• Large diameter bearing- NEI has capacity to
manufacturers up to 2000mm diameter
• Research and Development – Divided into four
sections- Design & Development, Test Rig,
Wear Test and Machine Building
• SAP-ERP-

9. Tapered Roller Bearings(Allotted):
TRB consists of four parts-
1. Cup (Outer Race)
2. Cone (Inner Race)
3. Retainer
4. Roller

12. Row material composition for cup and
cone:
• SAE 52100 High Carbon Chrome Bearing Steel
Constitute % Composition
Carbon 0.95 to 1.1
Chromium 1.4 to 1.6
Manganese 0.50 max.
Sulphur 0.025 max.
Silicon 0.15 to 0.35
Phosphorous 0.05

13. Processes involved in TRB production:
1. Forged Raw material from vendors
2. Raw material inspection
3. Heat treatment
4. Rockwell Hardness test
5. Grinding & Finishing
6. Assembly
7. Crack Inspection & Demagnetization
8. Final Inspection & Packaging

14. Raw material from vendors
• Forged raw material
• Suppliers – Ajanta turnings, Balaji engineering,
Keshav engineering, Microtech engineering,
Microtech rollers
• No. of lots per month= 300 (approx.) and each
lot has quantity of 2000-3000 bearing parts

15. Inspection:
• Name of Inspection Items: Turned Finish Cup,
Turned Finish Cone, Retainer, Semi
Finish/Finish Rollers
• Sample Plan= Zero Based Acceptance
• Hardness = 90HRB of cup & cone
= 20-25HRC for roller
• Major Issues: flange width, OD Size,
Undercut, Bore Size, Oil Groove Position,
Visual Defector, Eccentricity

16. Heat treatment
Process of hardening the soft material
It is done in CHUGAIRO furnace
• Continuous draw furnace
• Mesh belt conveyor type
• It involves six processes: prewash, hardening,
quenching, post washing, tampering, air cooling

17. Layout of CHUGAIRO furnace

18. Rockwell Hardness Test:
• Where we do this test-Before
and after tampering process
• After every hour 5 samples
taken out to check their
hardness
• Hardness –
Before tampering: 62-64 HRC
After tampering: 60-62 HRC

19. Ovality checking
• After hardening process ovalty of cup and
cone is checked
• If ovality <100 micro m then ok
• If 100 -200 micro m then keep separate and
their grinding is done separately
• If more than 200 micro m then ovalty is
corrected on stretching table and then pit
tempering is done

20. Grinding and finishing:
Different processes for cone
I. Dimension checking
II. Face grinding
III. OD Grinding
IV. Flange grinding
V. Bore grinding
VI. Honing
VII. Washing
VIII.Auto dimension check

21.  Different processes for cup:
I. Face Grinding
II. OD grinding
III. ID grinding
IV. ID Honing
V. Washing
VI. Auto dimension check

22.  Different processes for roller
I. Feed in to feeding hopper
II. Head grinding
III. OD Grinding
IV. OD Honing
V. Washing
VI. Inspection ( visual inspection of head face &
OD)

23. STEPS IN ASSEMBLY LINE
I. Rollers are assembled in retainer
II. Cone fitting with retainer and by pressing
they are fitted tightly
III. Demagnetization
IV. Oil washing ( Kerosine )
V. Noise checking
VI. Manually fitting the Cup
VII.Laser printing

24. Final inspection and Packing:
Height checking of assembled cone
Visual inspection
Packing- according to demand, some
companies like Tata motors, Mahindra &
Mahindra demand cup and cone separately

25. Miscellaneous:
Productivity- Avg. 8,40,000 TR bearings per
month
Quality- Avg. rejection by customers= 1 PPM
Disassembly- 4,000 PPM
Oil consumption during assembly- 2,780 liters
per lakh equivalent bearing

26. Comparison of NBC Bearing and TATA Bearing:
Type NBC Bearing TATA bearing
o Stake 11% 2%
o Turnover Rs. 1326 crores Rs. 186 Crores
o Quantity 45.6 Mn. Nos./annum 17 Mn. Nos./an.
o Range 6mm bore to 15mm bore to
1300mm OD 900mm OD
o Quality(Rejection) 1 PPM 7 PPM
o Customers More than 34 big 12 industries in
industries and India and 4 other
21 countries countries

27. Learning:
• Working of CHUGARIO Furnace
• Effect of quenching medium
• Effect of conveyor belt speed
• Process of Rockwell hardness test
• Why material is Demagnetized in assembly line

28. Suggestions:
• Reduce the distance between raw material
store room and Chugairo furnace
• After ovality checking use of conveyor belt
• In 3 lines out of total 12 lines of grinding, their
was manual inspection of cup & cone, that
must be eliminated
• Manual feeding of cone for face grinding
should be eliminated.

29. Bibliography:
• www.nbcbearings.in
• www.tatabearings.com
• www.timken.com
• www.rollerbearingcn.com
• Material Science and Engineering by W. Callister,
Chapter 7- Phase Diagrams, chapter 8- Phase
Transformations, page no. -170-275
• RAO P.N, volume 1, Engineering Materials, Tata
McGraw Hill Education Private Limited, Second
Reprint 2009.

30. THANK YOU