Informatics Publishing Limited

Ritesh Kumar Dewangan ¹, Surendra Pal Singh Matharu ²

Affiliations
1 Department of Mechanical Engineering, Rungta College of Engineering & Technology, Raipur (C.G.)-492001., IN
2 Department of Mechanical Engineering, National Institute of Technology, Raipur (C.G.)-492001., IN

Abstract

Performance of ball bearings depends on the quantity of lubricant present between the rolling elements. A separating oil film is essential in between the elements of the bearing having relative motion for smooth operation and long life. Effective lubrication enhances working life of the bearing by reducing the friction between balls and races. Absence or paucity of the lubricant film leads to early bearing failure. In the present work, the lubricant film thicknesses for bearings 6207 and 6307 are calculated for variety of lubricants based on formula proposed by Archard and Kirk. The developed formula along with inexpensive measuring instruments can be used for online condition monitoring of rolling element bearings.

Keywords

Ball Bearing, Friction, Lubricant Film Thickness, Online Condition Monitoring, Rolling Elements, Working Life

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Ritesh Kumar Dewangan ¹, Surendra Pal Singh Matharu ²

Affiliations
1 Department of Mechanical Engineering, Rungta College of Engineering & Technology, Raipur (C.G.), IN
2 Department of Mechanical Engineering, National Institute of Technology, Raipur (C.G.), IN

Abstract

Rolling element bearing is one of the most essential component of the machinery and automobile. Proper lubrication of the bearing enhances its life. Out of various monitoring methods, online condition monitoring of Rolling Bearing yields useful results. A setup for this purpose has been earlier developed by researchers. The method uses electrical resistance between the races of bearing for evaluation of analytically formulated representative lubricant film thickness (RLFT). The formula developed has one parameter Electrical Resistivity of the lubricant. Present work incorporates planning of experiment by General full factorial design for determination of resistivity of lubricant SAE 40. Analysis has been done by Graphical Representation and 2- level factorial design of Design of Experiment (DOE). The 2-level factorial design is performed on statistical software Minitab 16 for the proper value of the Resistivity of the Lubricant.

Keywords

Rolling Element Bearing, Representative Film Thickness (RLFT), Design of Experiment, General Full Factorial Design, 2-Level Factorial Design, Electrical Resistivity, P-Value, Significant Factor.

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Ritesh Kumar Dewangan ¹, Manoj Kumar Sahoo ², Manas Patnaik ¹

Affiliations
1 Department of Mechanical Engineering, Rungta College of Engineering & Technology, Raipur, IN
2 Department of Mechanical Engineering, Lakhmi Chand Institute of Technology, Bilaspur, IN

Abstract

Implementation failure in six sigma concept in supply chain management has been increasing as a concern. The reason for many Six Sigma programmes to fail is due to an implementation model which is not at all user friendly. Using a successful Six Sigma, we have to perform strategic analysis driven by the market and the customer. It is necessary to establish a high-level, cross-functional team to drive the improvement initiative and to identify overall improvement tools. We can perform high-level process mapping and prioritize improvement opportunities and develop a detailed plan for low-level improvement teams, and then to implement, document, and revise as necessary. This is important for both practitioners and academicians for achieving success at the industry level.

Keywords

Document, Implementation, MSOC, Revise, Six Sigma.

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Ritesh Kumar Dewangan ¹, Surendra Pal Singh Matharu ²

Affiliations
1 Department of Mechanical Engineering, Rungta College of Engineering and Technology, Raipur - 492001, Chhattisgarh, IN
2 Department of Mechanical Engineering, National Institute of Technology, Raipur – 492001, Chhattisgarh, IN

Abstract

Objective: In rolling bearing the contact area between the ball and race plays a vital role for the formation of the lubricant film. Objective of present work is calculation of major and minor axis and further the elliptic contact area developed between the ball & races of the rolling element bearing. Methods/Statistical Analysis: For this bearing 6207 is selected and analytically the contact area is calculated at different load and how the load affects the contact area is analyzed. In addition to analytical method elliptical contact area is also calculated using Artificial Neural Network (ANN). Findings: Using the ANN the error in the calculated contact area is found nearly 1%. So ANN is found to be a successful tool for the prediction of the elliptic contact area. Application/improvement: This eliminates the cumbersome of calculation.

Keywords

Artificial Neural Network (ANN), Elliptical Contact Area, Elliptic Parameter, Elliptic Integral, Lubricant Film Thickness, Rolling Element Bearing.

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Ritesh Kumar Dewangan ¹, Surendra Pal Singh Matharu ²

Affiliations
1 Department of Mechanical Engineering, Rungta College of Engineering & Technology, Raipur (C.G.) 492001, IN
2 National Institute of Technology, Raipur (C.G.) - 492001, IN

Abstract

Rolling element bearings are widely used in the industry and automobiles. Contact area between the races and balls plays an important role for the formation of elastohydrodynamic lubricant film. Formation of elastohydrodynamic lubricant film is the deciding factor for the life of the bearing. To increase the life it is important to maintain the lubricant film between the ball and races. Hertz has given the idea to calculate the contact area. Aim of this present paper is to calculate the elliptical and circular contact area for the rolling element bearing 6007, 6207, 6307&6407 at different load. And comparison is also made for elliptical and circular contact area.

Keywords

Rolling Element Bearing, Elastohydrodynamic Lubricant Film, Hertz Contact Area, Elliptical Contact Area, Elliptical Parameter, Complete Elliptical Integral of Second Kind.

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