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White Paper 8 – Lubrication Mechanism of Grease for High Speed Spindle Bearings Application

Foreword

In order to reduce processing time and improve machining accuracy, machine tools bearings should have high rigidity, higher running speed and minimal temperature rise. Also, to prevent environmental pollution, there is an increased demand to reduce lubricant consumption and adoption of grease lubrication. In particular, the most wanted technology in the bearing market is adoption of a grease lubrication system that is eco-friendly and is easy to handle and maintain. A grease lubricated bearing system is required to withstand operation of 20,000 hours without re-lubrication therefore, grease with high durability is needed.

Generally, durability of a given grease is affected by its heat resistance feature (resistance against oxidation-deterioration. Thus, to evaluate their durability the bearings need to be tested by subjecting them to high temperature in excess of 150˚C . However, on machine tool bearings that are used under ordinary-temperature high-speed environment, it has been observed from experience that greases with high-temperature durability do not always achieve longer life. Therefore, greases for actual machine tool bearings have been evaluated and selected through durability tests.

Consequently, for machine tools bearings to efficiently achieve longer life under grease lubrication, we have to (a) define the mechanism that controls grease life under an ordinary-temperature high-speed environment and (b) develop a long-life bearing based on the resultant finding.

This technical paper identifies the various characteristics needed for long-life grease in machine tool bearings, and presents the information about  “SE-1” grease that is used on sealed angular contact ball bearings that can operated with  dmn=1.7 million.

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White Paper – Lubrication Mechanism of Grease for High Speed Bearings Spindle Application

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NEWS LETTER – SANDESH DHAARA APRIL 2019

News Letter Highlights : Sandesh Dhaara April 2019

  1. Message from MD’s Desk
  2. TPM Awareness Programs
  3. KAIZEN Improvement at NIBL Plant
  4. Hannover Messe 2019 (1st April 2019 – 5th April 2019)
  5. Ram Navami Celebration at Korta Bangalore Plant on 13th April 2019
  6. Birthday Celebration at Mumbai HO
  7. Women Empowerment at Shendra, Aurangabad Plant
  8. Bearing Facts !!

Click to Download News Letter : Sandesh Dhaara April 2019

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WHITE PAPER 7 – Boundary Dimensions and Bearing Numbers

BOUNDARY DIMENSIONS AND BEARING NUMBER

ISO Dimensional system for Bearings

Standardized dimension system is adopted worldwide for dimensioning the rolling bearings, as bore diameter, outer diameter, width and chamfer dimensions. The ISO dimensional system defines the nomenclatures for the following dimensions for rolling bearings: bore diameter: d, outside diameter: D, width: B and height: T and chamfer dimension: r.

The table 5.1 shows factor fD and bore diameter d, from which the outer diameter of the bearing can be obtained. Symbols 9,0,2,3 are the common diameter series symbols. The diameter series helps to determine the thickness between the bore and the outer diameter of the bearings. Fig 5.1 shows the increasing order for the outer diameter series and same bore size i.e. 7, 8, 9, 0, 1, 2, 3, and 4.   The factor fB combines with the diameter series to classify the width series of the bearing. The combination of the diameter series and width series is the dimensional series.

The boundary dimensions of the thrust bearings are given same as the dimensions of the radial bearings as, outside diameter: D=d+ f Dd0.8, and height: T= fT · (D–d)/2. Minimum chamfer dimension: rs min, should be selected from ISO table

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White Paper – Boundary Dimensions and Bearing Numbers

 

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News Letter – Sandesh Dhaara March 2019

News Letter Highlights : Sandesh Dhaara March 2019

  1. Message from MD’s Desk
  2. Design and development of Spinning Machine by R&D Team.
  3. SAFETY WEEK observed at Shendra Plant
  4. KAIZEN Improvement at NIBL Plant
  5. Women’s Day Celebration at Mumbai HO
  6. Birthday Celebration at Mumbai HO
  7. Fun Facts about Bearing !!

Click to Download News Letter : Sandesh Dhaara March 2019

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News Letter – Sandesh Dhaara February 2019

News Letter Highlights : Sandesh Dhaara February 2019

  1. Message from MD’s Desk
  2. Total Productive Maintenance ( TPM ) Team Introduction
  3. Lecture at Deogiri Institute of Engineering & Management Studies – ” KAIZEN & Industrial Applications “
  4. Program on “ Digital Literacy ” at Shri. Trilochan Singh Sahney Memorial Centre For Learning & Development
  5. KAIZEN Improvement at NIBC Plant
  6. ” Maan Ki Baat ” with Mr. Mangesh Joshi ( HR Head )
  7. Cricket Match for Employees at Shendra
  8. Head Office Team – Outbound Trip to Gorai Beach

Click to Download News Letter : Sandesh Dhaara February 2019

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News Letter – Sandesh Dhaara January 2019

News Letter Highlights : Sandesh Dhaara January 2019

  1. Message from MD’s Desk
  2. Total Productive Maintenance ( TPM ) Introduction
  3. Lecture at MGM Institute – ” Effective Sales & Marketing of Machine Tool Accessories “
  4. Program on “8D Corrective Action & Root Cause Analysis”
  5. Participation in IMTEX 2019 Bangalore : 24th–30th Jan 2019

Click to Download News Letter : Sandesh Dhaara January 2019

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White Paper 6 – Handling of Bearings

Handling of Bearings

  • Precautions for Proper Handling of Bearings

Bearings must be handled carefully as they are high precision machine parts and the small damage may affect the performance of the machine where bearings are installed.

Some important precautions to be taken in bearing handling are as follows:

  • Clean Bearings and Surrounding Area of bearings

Bearings and the area surrounding the bearings should be kept clean as the small amount of the dust and dirt can be harmful to the performance of the high precision bearing.

  • Careful Handling

Bearing should be handled with care as they are high precision machined parts. Small damage may cause bearing scratched, brinelling, and permanent deformation of raceways, breaking or cracking that may lead bearing failure and may not run to its full capacity. Proper training should be given for the handling of the bearing.

  • Use Proper Tools

Proper bearing handling equipments should be used for handling the bearings

  • Prevent Corrosion

The bearings should be prevented from corrosion. Dust on the hands, moisture and contaminants while handling the bearing may cause corrosion on the bearing surfaces. Wear gloves while handling the bearing. Bearing should not be stored in the atmosphere where there are the chances of the presence of the corrosive gases. Proper standard should be prepared and followed for the prevention of the corrosion on bearing while handling.

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White Paper – Handling of Bearings

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White Paper 5 – Bearing Lubrication

Bearing Lubrication

  • Lubrication of Rolling Bearings

 One of the most important requirements for effective function of bearing arrangements is proper lubrication.

The lubricant forms the layer between metallic bearing surfaces and thus reduces friction among the surfaces, also it acts as a barrier against entry and reach of contaminations or impurities to bearing raceways protects the steel parts. For each of these reasons the lubrication fulfils a key function in each bearing application. A malfunction of the lubrication usually causes an immediate failure of bearing.

  • Basic Function of Lubrication:
  1. Reduce the friction between contact surface of bearing components
  2. Reduce wear of bearing components
  3. Carry away heat generated in the bearing due to friction and other causes
  4. Prolong bearing life by covering rolling contact surfaces with proper oil film
  5. Prevent corrosion and contamination
  • Methods of Lubrication

Normally three different lubrication methods are used:

  1. Grease lubrication
  2. Oil lubrication
  3. Solid and dry lubrication

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White Paper – Bearing Lubrication

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White Paper 4 – Speed of Bearings

Speed of Bearings

  • Limiting Speed of Bearings

 The rotation of the rolling bearings is limited to certain limits. During operating condition the increase in speed of the bearing also led to the increase of temperature because of the friction. The maximum speed at which bearing can be operated continuously without failure and excessive heat generation, such speed can be determined by the formula called as limiting speed of the bearings. The factors which affect the limiting speed of the bearings are, bearing type and size, cage form and material, applied load, lubrication method, and heat dissipation method including design of the bearing’s surroundings.

The limiting speeds can be given as C/P ≥ 12.5 and Fa /Fr ≤ 0.25 for the bearings of standard design and subjected to normal loads.

Different lubricants are used for different operating speed. Lubricants used for the high speed have different characteristics. When the limiting speeds increases to more than 70 % of the bearing limiting speed special type of oil or lubricants should be used, else contact NIBL.

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White Paper – Speed of Bearings

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White Paper 3 – Friction in Bearings

Friction in Bearings

Rolling bearings are called anti-friction bearing. They have high loading capacity and exhibit very low rolling friction torques.   The friction torques are similar or lower than ideally designed plain bearing operating under conditions of thick film lubrication.  Rolling bearing has low starting torques.

  • Friction component and influence factor

 

The idling friction is depends on the quantity of lubricant, operating speed, viscosity of lubricant during operation, seal and operating conditions in which bearing is running.

The bearing friction torque Mr = F. f. (d/2) or

The bearing friction torque Mr = F. fm. (Dm/2)

  • Mr = Friction torque (N mm)
  • F = Radial (or axial load) (N)
  • f = coefficient of friction of rolling bearing.
  • fm = coefficient of friction of rolling bearing based on mean diameter
  • d = Diameter of the bore of the bearing (Shaft diameter)(mm)
  • D = Outside diameter of the bearing (mm)
  • Dm = (d+D)/2 (mm)

To know more click on the below link … 

White Paper – Friction in Bearings

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