Volume 2 Issue 3
Characterization and Modelling of a New Heavy Axle Load Freight Wagon for Wheel Rail Wear Prediction
Authors: Guilherme Fabiano Mendon?a dos Santos; Roberto Spinola Barbosa; Xinggao Shu; Curtis Urban; Richard Joy
Abstract: Vale projects an increase in annual tonnage of more than 120 percent its Estrada de Ferro Carajás between 2012 and 2017. Part of the increase will be accomplished by obtaining new wagons that will be operated at 37.5 tonne axle loads. Transportation Technology Center, Inc. (TTCI) and Vale conducted a test of a new wagon to determine secondary suspension stiffness as well as inertial mass moments of inertia of the wagon body. The results were used in conjunction with results from track testing to construct an accurate model of the wagon. The validated model was used to compare wheel and rail wear at the increased axle loads with the current axle load of 32.5 tonnes. While wheel and rail RCF and wear are predicted to increase with current wheel profiles, implementation of improved wheel profiles may reduce wear and RCF significantly. In addition, the importance of preventive grinding and lubrication is emphasised.
Keywords: Rail Wheel Interaction; Rolling Contact Fatigue; Rolling Stock Design; Simulation; Wear
Authors: Markert F.; Braternitz V.; Sebhi A.
Abstract: Finding ways of precise machining and cutting circonstances such as the hardness of metal machining, leads us straight to the use of unconventional methods such as electric discharge machining, electrolytic machining, laser machining etc. In fact, the machining of molds for plastic injection, aluminum injection still requires an extreme precision and a best possible surface for the extraction of parts produced without possible deformation or fixing. Technically, electroerosion allows a greater precision and possible unequaled details with other processes. The aim of this study is to familiarize the manufacturer with this machining process by studying the interactions discharge parameters and their influence on the surface finish and the volume of chips debited to electroerosion. The results are given in the form of curves, which will enable us to choose the optimal regimes for pulse generators encountered in the workshop. But, the process has some major disadvantages that must be taken into consideration in order to carry out the machining operations in good conditions.
Keywords: Sinking; Discharge Current-Pulse-Frequency of The Capacitance-Voltage; Breakdown of the Flow of The Tool Wear-Roughness-GAP-Pulse Generator Of The-Surface State, Electrospark Machining, EDM (Electric Discharge Machining)