10409 Experimental study on rail wheel wear

2013 ◽  
Vol 2013.19 (0) ◽  
pp. 59-60
Author(s):  
Nonoka ADACHI ◽  
Hirotaka MORI ◽  
Yasuhiro SATO ◽  
Katsuyuki TAKAHASHI ◽  
Yasushi OKA ◽  
...  
Keyword(s):  
Experimental Study ◽  
Wheel Wear

An Experimental Investigation of the Effects of Microencapsulated Phase Change Material in Grinding Fluid Performance

1999 ◽  
Author(s):  
Jae M. Lee ◽  
Chi-Hung Shen
Keyword(s):  
Experimental Study ◽  
Phase Change ◽  
Phase Change Material ◽  
Metalworking Fluids ◽  
Wheel Wear ◽  
Significant Deterioration ◽  
The Third ◽  
Microencapsulated Phase Change Material ◽  
Change Material ◽  
High Shearing

Abstract This report documents an experimental study in the evaluation of the grinding performance of three metalworking fluids containing Microencapsulated Phase Change Material (MPCM) slurry. The results showed that wheel wear and surface finish were improved substantially in two cases while the performance became worse for the third fluid. There was significant deterioration of the microparticles because of the high shearing action of the circulating pump.

Experimental Study on Rail/Wheel Wear for Various Contact Conditions

2017 ◽  
Vol 2017.26 (0) ◽  
pp. 3203
Author(s):  
Kei OKUMURA ◽  
Yoshiaki TERUMICHI ◽  
Yasuhiro SATO ◽  
Hiroyuki OHNO ◽  
Katsuyuki TAKAHASHI ◽  
...  
Keyword(s):  
Experimental Study ◽  
Wheel Wear ◽  
Contact Conditions

Experimental Study on Grinding of a Nickel-Based Alloy Using Vitrified CBN Wheels

2011 ◽  
Vol 325 ◽  
pp. 134-139 ◽  
Author(s):  
Zhong De Shi ◽  
Amr Elfizy ◽  
Benoit St-Pierre ◽  
Helmi Attia
Keyword(s):  
Experimental Study ◽  
Surface Roughness ◽  
Material Removal ◽  
Removal Rate ◽  
Wheel Wear ◽  
Creep Feed ◽  
Nickel Based Alloy ◽  
Specific Material ◽  
Grinding Power ◽  
Vitrified Cbn

An experimental study is reported on the grinding of a nickel-based alloy using vitrified CBN wheels. This work was motivated by switching the grinding of fir-tree root forms of jet engine blades from creep-feed grinding with conventional abrasive wheels to vitrified CBN wheels. The objective is to explore process limits and practical grinding parameters for judging the switch in terms of overall costs and productivity. Straight surface grinding experiments were conducted with water-based fluid on rectangular blocks at a fixed wheel speed vs = 45 m/s, various depths of cut a = 0.05 - 1.0 mm, and workspeeds vw = 2 - 40 mm/s. Grinding power, forces, surface roughness, and radial wheel wear were measured. Specific material removal rate of 8 mm3/(mm.s) was reached in rough grinding using a wheel dressed for achieving surface roughness Ra = 0.8 µm in finish grinding. It was found that shallow depths of cut combined with fast workspeeds, or less creep-feed modes, are more suitable for achieving high material removal rates with vitrified CBN grinding. Rough grinding is restricted by high grinding temperatures with newly dressed wheels and by chatters with worn wheels.

Process Parameters and Residual Stresses in Cylindrical Grinding

2002 ◽  
Vol 124 (3) ◽  
pp. 615-623 ◽  
Author(s):  
Edoardo Capello ◽  
Quirico Semeraro
Keyword(s):  
Experimental Study ◽  
Residual Stresses ◽  
Process Parameters ◽  
Feed Rate ◽  
Depth Of Cut ◽  
Wheel Wear ◽  
Cylindrical Grinding ◽  
Grinding Conditions ◽  
Joint Parameters ◽  
The Relationship

The paper presents an experimental study on the relationship between process parameters and residual stresses in cylindrical grinding. In particular, the influence of the depth of cut (a) and the peripheral velocity of the workpiece vw was investigated. Residual stresses were found to depend on both parameters, but the effect of the peripherial velocity depends on the grinding conditions. In “easy to grind” conditions an increase in workpiece velocity leads to an increase in residual stresses, but in “difficult to grind” conditions an increase in workpiece velocity results in a decrease in residual stresses. Consequently, two joint parameters, Zw=as˙vw, and Kw=a/vw, were used to predict residual stresses. Regression analysis was then performed to determine the analytic relationship between the joint parameters and the residual stresses in “easy” and “difficult” grinding conditions. Finally, the influence of wheel wear, feed rate, sparkout and wheel dressing was investigated. The study showed that the workpiece feed rate does not seem to influence the residual stresses, while sparkout, wheel wear, and wheel dressing significantly affect the level of residual stresses generated during machining.

An Experimental Study of the Influence of the Amount of Top-Of-Rail Friction Modifiers on Traction

2021 ◽  
Author(s):  
Yu Pan ◽  
Ahmad Radmehr ◽  
Ali Tajaddini ◽  
Mehdi Ahmadian
Keyword(s):  
Experimental Study ◽  
Surface Profile ◽  
Traction Force ◽  
Friction Modifiers ◽  
Wheel Wear ◽  
Rail Wear ◽  
Traction Coefficient ◽  
Added Benefit ◽  
Roller Rig ◽  
Potential Factors

Abstract This study presents an experimental study of the effect of Top-of-Rail Friction Modifiers (TORFM) in quantities ranging from a small to a large amount on the progression of wheel-rail wear, using the Virginia Tech-FRA (VT-FRA) roller rig. TORFM behaves as a third body layer in between the wheel and rail and is applied to reduce wheel and rail wear while preserving a stable traction condition. An added benefit of TORFM is that it is estimated that it can reduce fuel consumption by controlling friction, although we are not aware of any proven data in support of this. Although widely used by the U.S. Class I railroads, there exists no proven method for determining, qualitatively or quantitatively, how the amount of TORFM and rail/wheel wear are related. Simply put, would increasing TORFM amount by a factor of two reduce wheel/rail wear and damage by one-half? How would such doubling effect traction or the longevity of TORFM on the wheel/rail surface? In this study, the VT-FRA roller rig is used to perform a series of tests under highly controlled conditions to shed more light on answering these questions. A series of controlled experiments are designed and performed in order to investigate the potential factors that may influence the traction performance. The wheel surface profile is measured by a high-precision, 3D, laser profiler to measure the progression of wheel wear for the duration of the experiments. The results indicate that it takes as much longer time for the traction force (traction coefficient) to reach a condition that is the same as the unlubricated rail, when compared between lightly-, moderately-, and heavily-lubricated conditions. The results further indicate that wear generation is delayed significantly among all lubrication conditions — even, the lightly-lubricated — when compared with the unlubricated conditions. A further evaluation of the results and additional tests are needed to provide further insight into some of the preliminary results that we have observed thus far.

An Experimental Study on Grinding Fir-Tree Root Forms Using Vitrified CBN Wheels

2014 ◽  
Vol 1017 ◽  
pp. 55-60 ◽  
Author(s):  
Zhong De Shi ◽  
Amr Elfizy ◽  
Helmi Attia
Keyword(s):  
Experimental Study ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Turbine Blades ◽  
Wheel Wear ◽  
Part Quality ◽  
Grinding Conditions ◽  
Vitrified Cbn ◽  
Maximum Material Removal Rate

An experimental study was undertaken to explore the conditions and performance on rough and finish grinding fir-tree root forms of turbine blades made of a nickel-based alloy using vitrified CBN wheels and water-based grinding fluid. This work was motivated by switching the grinding of fir-tree root forms from grinding with conventional abrasive wheels to vitrified CBN wheels for reducing overall production cost and enhancing productivity. Grinding experiments were conducted to measure grinding forces, power, surface roughness, and stress near the blade roots under various dressing and grinding conditions. Wheel re-dressing life in terms of the total number of good parts ground between dressing was tested with the condition producing the maximum material removal rate while satisfying preset part quality and process requirements. It was found that the maximum material removal rate achievable in rough grinding was restricted by the stress limit and the wheel re-dressing life was dominated by the radial wheel wear limit. The targeting part quality and process requirements were achieved. It was proved that vitrified CBN grinding process is feasible and very promising to machine fir-tree root forms.

Experimental study of wheel wear in electrolytic in-process dressing and grinding

2010 ◽  
Vol 50 (9-12) ◽  
pp. 931-940 ◽  
Author(s):  
Indraneel Biswas ◽  
A. Senthil Kumar ◽  
Mustafizur Rahman
Keyword(s):  
Experimental Study ◽  
Wheel Wear

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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