M. Garcia-Vilchez; Gamez-Montero, P.J.; Codina-Macia, Esteban; Castilla, R.; Raush, G.; Freire, F.; Rio, C. Advances in mechanical engineering Vol. 7, num. 7, p. 1-14 DOI: 10.1177/1687814015592561 Data de publicació: 2015 Article en revista
Trochoidal gear pumps produce significant flow pulsations that result in pressure pulsations, which interact with the system where they are connected, shortening the life of both the pump and circuit components. And this behaviour is not acceptable for the demands of its current applications. The complicated aspects of the operation of a gerotor pump make computational fluid dynamics the proper tool for modeling and
simulating its flow characteristics. Regarding the numerical simulation, a three-dimensional with deforming mesh Computational Fluid Dynamics (CFD) model is presented. The model includes the effects of the manufacturing tolerance and the leakage inside the pump. A new boundary condition is created for the simulation of the solid contact in the interteeth radial clearance. The experimental study of the pump is carried out by means of Time-Resolved Particle Image Velocimetry (TRPIV), and results are qualitatively evaluated thanks to the numerical simulation results. TRPIV is proved to be a feasible alternative to obtain the instantaneous flow of the pump in a direct mode. Thus, a new methodology involving CFD and TRPIV is presented, which allows the obtaining of the instantaneous flow of the pump in a direct mode without altering its behaviour significantly.
'The FLEXICAST project presents knowledge-based technologies that aim to follow the way to transform the conventional (batch-by-batch) foundry process into a flexible (mold-by-mold) process. The proposal technologies will be applicable not only to new cast iron foundry lines, but also is readily available to be retro-fitted to existing plants. The specific objectives are:a)A cast iron production cell. Together with melting, treatment and pouring sub processes in a cast iron production cell is essential and imperative. We propose to install the melting shop closer to the pouring system kept closed on the mould carrousel, while the transfer and treatment ladle is removed. The widespread adoption of new melting shop as an operating process is in itself fostering the creation of even more powerful induction-plasma power supplies, versatile melt control technology, high-power density furnaces, temperature control systems, nodularization systems(magnesium vapour), inoculation systems, and automated pouring systems.b)Integration of Artificial Intelligence-based Control System. The objective is to develop a software platform. This can help us to the prediction of local structures, phases and ultimately the local mechanical properties, to asses casting quality in the foundry. In this point, also, three specific methodologies will be studied and improved:DTA analysis and on-line microstructural analysis and X-ray for on-line inspection.c)A robot cell for automated metal finishing processes. d)Demo pilot plant in real industrial settings in order to demonstrate a clear breakthrough using project development in comparison with the state-of-art solutions. Some results are:a)Cast iron manufacturing cell represents, at least, 30% energy reduction in comparison with conventional melting systems.b)Drastic reduction melt temperature scattering during molding process. Reduce metal transport (No transfer and treatment ladles).c)Overheating reduction.d)Reduce rejection of casting pieces'
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Creation of microburrs drilling constitute a potencial danger because their detachment can modificate the correct operation of a mechanism. The burrs must be eliminated completely in the case of pistons brake, ensuring a high productivity and a low cost. In this work has been studied the mechanism for the creation of microburrs in thru holes drilled (phi2, 02 mm) of a aluminium alloy piston AA6065-T9 in order to various parameters such as the type of drill bit, feedrate, cutting speed and lubrication, imposing a minimum feedrate of 450 mm/min not to reduce the current production. Creation of microburrs drilling is inevitable and several deburring processes have been analyzed for their total elimination. After a few first essays, It has been determined that in order that the deburring are effective must be worked with minimal and known position burrr drillings.