06-04-2011, 10:26 AM
Presented by:
Naveen Kumar Dubey
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A PRESENTATION ON SUMMER TRAINING 2010
NATIONAL ENGINEERING INDUSTRIES LTD.,JAIPUR
INTRODUCTION TO NEI
Founded in year 1946 by renowned industrialist Late Shri B.M. Birla under the name of “NATIONAL BEARING COMPANY LIMITED”.
With a modest start of 30,000 bearings in 19 sizes, the first bearing was manufactured in 1950.
This figure has increased to manufacturing of nearly 3.8 million bearings per month in over 500 different sizes ranging from 6mm bore to 1300mm outer diameter.
Company has the capacity to manufacture bearings up to 2000mm outer diameter.
The name of the company changed to “NATIONAL ENGINEERING INDUSTRIES LIMITED” in 1958 after getting industrial licenses for other vital industries and manufacturing of Roller Bearing Axle Boxes for Railway Rolling Stock, Steel Balls, Tapered Roller Bearings, Spindle Inserts etc.
INTRODUCTION TO NEI
Today, NEI is manufacturing wide variety and range of bearings such as Ball Bearings, Steel Balls, Tapered Roller Bearings, Cylindrical Roller Bearings & Axle Boxes for Railway Rolling Stock including Spherical Roller Bearings, Cartridge Tapered Roller Bearings and Large Diameter Bearings in separate fully equipped factories.
DEPARTMENTS OF NEI
MY DEPARTMENT WAS………
HEAT TREATMENT DEPARTMENT
MY PROJECT WAS………….
BEARING MATERIAL
ELEMENT AMOUNT
Manganese - 0.25 to 0.35
Silicon - 0.025 to 0.35
Sulphur - 0.025 max
Phosphorous - 0.025 max
Nickel - 0.025 max
Copper - 0.35 max
Molybdenum - 0.10 max
RAW MATERIAL
Balls - Ni-Cr steel wire
Rollers - High carbon chrome steel rods
Cage - Brass and mild steel
PARTS OF BEARING
Outer Ring
Inner Ring
Rolling Elements
Cage
STEPS OF HEAT TREATMENT
HARDENNING TEST
OVALITY CHECKING
Ovality checking is done to long diameter and thin width outer race of bearing.
Ovality checking is done automatically by ovality checking machine.
This machine checks the ovality of outer race and then put correct one to one side , wrong one to other side.
Now these outer race of bearing which are found oval in shape again taken to dial gauge for checking the ovality reading.
After this nails are put in between the outer race.
And again these outer race’s are put into different furnace.
After sometime all outer race’s are taken out and get cool.
This is how the ovality of outer race of bearing is removed.
PROCESS TO OUTER AND INNER RACE
ASSEMBLY SECTION
Cage Rivet Outer Ring Inner ring Balls
Put Inner In Outer
Insert cage
Insert Balls
Put under Riveting Machine
Riveting
Washing Of Bearing
DE Magnetizing
Clearance Testing
Application Anti Rust
Packing of bearing
Ready to Dispatch
