Tribological Relationship for Sintered Bearing Using Taguchi Technique

Tribological Relationship for Sintered Bearing Using Taguchi Technique

Priya Shekhar Gajjal (Department of Mechanical Engineering, Sinhgad College of Engineering, Pune, India), Geeta Lathkar (MGM'G College of Engineering and Technology, Nanded, India) and Harijan Bagchi (College of Engineering, Pune, Pune, India)
DOI: 10.4018/IJSEIMS.2015010103
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Abstract

Sintered bearing materials have been developed in order to be used as a journal bearing material without lubrication. This paper presents a study of influence of manufacturing and process parameters on friction and wear of bearing. Plan of experiments, based on Taguchi technique was used to acquire the data in a controlled way. An orthogonal array (L27) and analysis of variance were employed to investigate the influence of parameters of dry ferrous bearing. The objective is to establish a correlation between process and manufacturing parameters with friction and wear by multiple regression analysis. Finally, confirmation tests were performed to validate the relationship as suggested through experiments.
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2. Experimental Set-Up And Procedure

The experiments were carried on a specially designed “Dry bearing test rig” (fig. 1) having shaft size 50 mm diameter. Test bearing is directly mounted on the shaft experiencing direct loading under a wide range of speed. Friction force is measured by an arm sensor suitably located in the frame. Wear is measured by off-line method. After running the samples for required duration on dry bearing test rig, wear is observed as dimensional changes of internal diameter of specimen and measured on coordinate measuring machine. Dimensional changes of bore are measured before and after experiment with samples and average wear are estimated. The test rig has got a control panel properly interfaced with the PC for data logging of process parameters. The test rig is powered by 5 HP, 3500 rpm, swinging field type. Counter face material is made up of case hardened steel, Rc-65 and surface roughness of 0.45 μm (CLA).

Figure 1.

Photographic view of Dry bearing test rig

3. Material

The material used in the study is ferrous sintered bearing having density 6.3-6.4 g/cm3. Chemical composition constitutes 99% Fe, 0.8% Cu and rest as impurities. Compaction pressure range from 500 to 800 MPa and curing temperature from 800ºC to 1100ºC. Dimension of the bearing specimen was ID-50mm, OD-70mm and length 60mm.

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