Estudio y modelización de la fase de estirado en el proceso de embutición profunda sobre chapa de acero bajo en carbono con revestimiento multicapa de polímero

El proceso de estirado es la fase más crítica en la fabricación de una lata metálica. Existe la posibilidad de utilizar como material de partida una chapa de acero revestida por tres capas de polímero, pero este revestimiento no debe de fallar ni romperse bajo ningún concepto, para que pueda ser considerado como una alternativa viable y eficaz al proceso tradicional. Durante el estirado, las deformaciones son muy severas y existen altas presiones entre la matriz y la pieza. La reducción de espesor que se produce en el estirado hace que se genere una gran cantidad de superficie nueva. El deterioro del revestimiento en esta delicada operación podría provocar que el alimento o bebida almacenado en el interior de la lata tuviese un contacto directo con el metal. Como puede apreciarse, la clave fundamental en el uso de láminas de acero revestidas por capas de polímero en la fabricación de latas radica precisamente en la supervivencia de éstas al proceso del estirado. Otro aspecto muy importante es la rugosidad superficial de la nueva superficie generada, porque la lata se ha de poder decorar perfectamente. El hecho de cambiar el método de fabricación tradicional de las latas de bebidas o de los envases metálicos, y utilizar en cambio este nuevo material previamente revestido, permite una notable reducción en la contaminación medioambiental generada al evitar la formación de compuestos orgánicos volátiles (COV's) en la fabricación de las capas de polímero. Esta reducción también es mayor al no utilizar lubricantes adicionales, ya que las capas de polímero sólido previamente revestidas sirven de auto-lubricante del proceso de la embutición. Estos objetivos, junto con el de la mejora de las características mecánicas y la adhesión de la pintura o imprimación decorativa, se consiguen con la utilización del material con el que se trabaja. Se ha realizado una búsqueda bibliográfica sobre el proceso de estirado en materiales revestidos, y algunos autores utilizan y argumentaSellés Cantó, MÁ. (2009). Estudio y modelización de la fase de estirado en el proceso de embutición profunda sobre chapa de acero bajo en carbono con revestimiento multicapa de polímero [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/5023Palanci

Social responsibility vs sustainability and development

[EN] This investigation deals with the Social Responsibility or Corporate, based on an important element in a very direct influence on the development of organizations, what are the trends that produce in the market that their products destined for thereupon undertake what could be considered as a suitable Integrated Business Management System CSR and trends nationally, internationally and in the specific area of Valencia.[ES] En la presente investigación se aborda la Responsabilidad Social Empresarial o Corporativa, partiendo de un importante elemento que influye de forma muy directa en el desarrollo de las organizaciones, cuales son las tendencias que se producen en el mercado al que destinan sus productos, para acto seguido acometer lo que podría considerarse como un adecuado Sistema Integral de Gestión Empresarial de RSE y sus tendencias a nivel nacional, internacional y en el ámbito específico de la Comunidad Valenciana.Pérez Bernabeu, E.; Sellés Cantó, MÁ. (2012). Responsabilidad social vs sostenibilidad y desarrollo. 3C Empresa, Investigación y pensamiento crítico. (2):37-44. http://hdl.handle.net/10251/34371S3744

An Efficient COVID-19 Prediction Model Validated with the Cases of China, Italy and Spain: Total or Partial Lockdowns?

[EN] The present work develops an accurate prediction model of the COVID-19 pandemic, capable not only of fitting data with a high regression coefficient but also to predict the overall infections and the infection peak day as well. The model is based on the Verhulst equation, which has been used to fit the data of the COVID-19 spread in China, Italy, and Spain. This model has been used to predict both the infection peak day, and the total infected people in Italy and Spain. With this prediction model, the overall infections, the infection peak, and date can accurately be predicted one week before they occur. According to the study, the infection peak took place on 23 March in Italy, and on 29 March in Spain. Moreover, the influence of the total and partial lockdowns has been studied, without finding any meaningful difference in the disease spread. However, the infected population, and the rate of new infections at the start of the lockdown, seem to play an important role in the infection spread. The developed model is not only an important tool to predict the disease spread, but also gives some significant clues about the main factors that affect to the COVID-19 spread, and quantifies the effects of partial and total lockdowns as well.Sanchez-Caballero, S.; Sellés Cantó, MÁ.; Peydro, MA.; Pérez Bernabeu, E. (2020). An Efficient COVID-19 Prediction Model Validated with the Cases of China, Italy and Spain: Total or Partial Lockdowns?. Journal of Clinical Medicine. 9(5):1-18. https://doi.org/10.3390/jcm9051547S11895Huang, C., Wang, Y., Li, X., Ren, L., Zhao, J., Hu, Y., … Cao, B. (2020). Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China. The Lancet, 395(10223), 497-506. doi:10.1016/s0140-6736(20)30183-5Al-qaness Mohammed A. A., Ewees, A. A., Fan, H., & Abd El Aziz, M. (2020). Optimization Method for Forecasting Confirmed Cases of COVID-19 in China. Journal of Clinical Medicine, 9(3), 674. doi:10.3390/jcm9030674Roosa, K., Lee, Y., Luo, R., Kirpich, A., Rothenberg, R., Hyman, J. M., … Chowell, G. (2020). Short-term Forecasts of the COVID-19 Epidemic in Guangdong and Zhejiang, China: February 13–23, 2020. Journal of Clinical Medicine, 9(2), 596. doi:10.3390/jcm9020596Shao, N., Zhong, M., Yan, Y., Pan, H., Cheng, J., & Chen, W. (2020). Dynamic models for Coronavirus Disease 2019 and data analysis. Mathematical Methods in the Applied Sciences, 43(7), 4943-4949. doi:10.1002/mma.6345Sun, K., Chen, J., & Viboud, C. (2020). Early epidemiological analysis of the coronavirus disease 2019 outbreak based on crowdsourced data: a population-level observational study. The Lancet Digital Health, 2(4), e201-e208. doi:10.1016/s2589-7500(20)30026-1Zhao, S., & Chen, H. (2020). Modeling the epidemic dynamics and control of COVID-19 outbreak in China. Quantitative Biology, 8(1), 11-19. doi:10.1007/s40484-020-0199-0Kuniya, T. (2020). Prediction of the Epidemic Peak of Coronavirus Disease in Japan, 2020. Journal of Clinical Medicine, 9(3), 789. doi:10.3390/jcm9030789Coronavirus COVID-19 Global Cases by the Center for Systems Science and Engineeringhttps://github.com/CSSEGISandData/COVID-19Wuhan Lockdown “Unprecedented”, Shows Commitment to Contain Virus: WHO Representative in Chinahttps://www.reuters.com/article/us-china-health-who-idUSKBN1ZM1G9First Case of Coronavirus Confirmed in Spainhttps://edition.cnn.com/asia/live-news/coronavirus-outbreak-02-01-20-intl-hnk/h_afcf3a4665521aab11c721c8cc80dd03Coronavirus Confirmed as Pandemic by World Health Organizationhttps://www.bbc.com/news/world-51839944MWC 2020: Smartphone Showcase Cancelled over Coronavirus Fearshttps://www.bbc.com/news/technology-51474116Capacity of the First League Stadiums in Spainhttps://www.enterat.com/actualidad/estadios-futbol-espana.phpMore than 550,000 People Demonstrating for Women Rights in Madrid and Barcelonahttps://www.elmundo.es/espana/2019/03/08/5c82a5da21efa09e348b469c.htmlMadrid Locksdown the Education System and Recommends Teleworkinghttps://www.lavanguardia.com/local/madrid/20200309/474061897680/madrid-ordena-cierre-colegios-coronavirus.htmlAll of Italy Placed under Coronavirus Lockdownhttps://www.bbc.com/news/world-europe-51810673State of Alarm Conditionshttps://www.boe.es/eli/es/rd/2020/03/14/463/conMerkel Says ‘Let’s Get through This’ as Shops, Bars and Churches Shuthttps://www.reuters.com/article/us-health-coronavirus-germany-economy/merkel-says-lets-get-through-this-as-shops-bars-and-churches-shut-idUSKBN213178Coronavirus: Europe Plans Full Border Closure in Virus Battlehttps://www.bbc.com/news/world-europe-51918596Italy Tightens Virus Lockdown after Worst Daily Death Tollhttps://www.bloomberg.com/news/articles/2020-03-19/italy-is-now-world-s-deadliest-hotspot-in-the-virus-pandemicChina to Lift Lockdown on Wuhan, Ground Zero of Coronavirus Pandemichttps://edition.cnn.com/2020/03/24/asia/coronavirus-wuhan-lockdown-lifted-intl-hnk/index.htmlCoronavirus: Strict New Curbs on Life in UK Announced by PMhttps://www.bbc.com/news/uk-52012432State of Alarm Thighteninghttps://www.boe.es/buscar/doc.php?id=BOE-A-2020-4166Coronavirus: Sharp increase in Deaths and Cases in Hubeihttps://www.bbc.com/news/world-asia-china-51482994Kampf, G., Todt, D., Pfaender, S., & Steinmann, E. (2020). Persistence of coronaviruses on inanimate surfaces and their inactivation with biocidal agents. Journal of Hospital Infection, 104(3), 246-251. doi:10.1016/j.jhin.2020.01.022Coronavirus Disease (COVID-2019) Situation Reportshttps://www.who.int/emergencies/diseases/novel-coronavirus-2019/situation-reports

FEM3DD software verification

Structural optimization requires a large numberof structures to be evaluated. In simultaneous size and shapeoptimization, where only metaheuristics techniques can beused, the number of evaluations can easily ran into thousands.Renowned and widespread commercial software like ANSYSor MSC Nastran are multipurpose FEM (Finite ElementMethod) programs have high initialization times which are evenhigher than the computing ones. This has a vital influence onthe algorithm performance, especially in population basedmetaheuristic techniques. In order to avoid this issue, lighterFEM software or even embedded FEM code should be used.Among the Openware FEM code, the software FEM3DD canbe highlighted. From its features, it is worthy to stand out: fastinitialization, multi-OS open source code (GNU license),command line operation, CSV and Matlab files reading, andwell documented.Sánchez Caballero, S.; Sellés Cantó, MÁ.; Peydro Rasero, MÁ.; Juárez Varón, D. (2013). FEM3DD software verification. Annals of The University of Oradea. XXII(1):335-338. http://hdl.handle.net/10251/35936S335338XXII

Design and simulation of a resorbable bone fixation plate made by additive manufacturing for femoral mid-SHAFT fractures

[EN] Finite element method has been employed to establish the feasibility of a fixation plate made of PLA by additive manufacturing for femoral shaft fractures. For this purpose, Von Mises stress and the pressure contact between bones had been analysed. The proposed design has been compared with an actual titanium fixation plate as a point of reference.J. Ivorra-Martinez is funded with a Formación de Profesorado Universitario (FPU) grant from the Spanish Government (Ministerio de Ciencia, Innovación y Universidades), with reference FPU19/01759.Ivorra Martínez, J.; Sellés Cantó, MÁ.; Sánchez Caballero, S.; Boronat Vitoria, T. (2021). Design and simulation of a resorbable bone fixation plate made by additive manufacturing for femoral mid-SHAFT fractures. Journal of Applied Research in Technology & Engineering. 2(1):11-16. https://doi.org/10.4995/jarte.2021.14712OJS111621Alizadeh-Osgouei, M., Li, Y., Wen, C. (2019). A comprehensive review of biodegradable synthetic polymerceramic composites and their manufacture for biomedical applications. Bioactive materials, 4(1), 22-36. https://doi.org/10.1016/j.bioactmat.2018.11.003Arabnejad, S., Johnston, B., Tanzer, M., Pasini, D. (2017). Fully porous 3D printed titanium femoral stem toreduce stress-shielding following total hip arthroplasty. Journal of Orthopaedic Research, 35(8), 1774-1783.https://doi.org/10.1002/jor.23445Elkins, J., Marsh, J.L., Lujan, T., Peindl, R., Kellam, J., Anderson, D D., & Lack, W. (2016). Motion predicts clinical callus formation: construct-specific finite element analysis of supracondylar femoral fractures. The Journal of bone and joint surgery. American volume, 98(4), 276. https://doi.org/10.2106/JBJS.O.00684Geetha, M., Singh, A.K., Asokamani, R., Gogia, A.K. (2009). Ti based biomaterials, the ultimate choice for orthopaedic implants-a review. Progress in materials science, 54(3), 397-425. https://doi.org/10.1016/j.pmatsci.2008.06.004George, D., Allena, R., Remond, Y. (2017). Mechanobiological stimuli for bone remodeling: mechanical energy, cell nutriments and mobility. Computer Methods in Biomechanics and Biomedical Engineering, 20(sup1), S91-S92, https://doi.org/10.1080/10255842.2017.1382876Guastaldi, F., Martini, A., Rocha, E., Hochuli-Vieira, E., Guastaldi, A. (2019). Ti-15Mo Alloy Decreases the Stress Concentration in Mandibular Angle Fracture Internal Fixation Hardware. Journal of Maxillofacial and Oral Surgery, 19, 314-320. https://doi.org/10.1007/s12663-019-01251-8Hayes, J., Richards, R. (2010). The use of titanium and stainless steel in fracture fixation. Expert review of medical devices, 7(6), 843-853. https://doi.org/10.1586/erd.10.53Heimbach, B., Grassie, K., Shaw, M.T., Olson, J.R., Wei, M. (2017). Effect of hydroxyapatite concentration on highmodulus composite for biodegradable bone-fixation devices. Journal of Biomedical Materials Research Part B: Applied Biomaterials, 105(7), 1963-1971. https://doi.org/10.1002/jbm.b.33713Jahagirdar, R., Scammell, B.E. (2009). Principles of fracture healing and disorders of bone union. Surgery (Oxford), 27(2), 63-69. https://doi.org/10.1016/j.mpsur.2008.12.011Kanno, T., Sukegawa, S., Furuki, Y., Nariai, Y., Sekine, J. (2018). Overview of innovative advances in bioresorbable plate systems for oral and maxillofacial surgery. Japanese Dental Science Review, 54(3), 127-138. https://doi.org/10.1016/j.jdsr.2018.03.003Kim, H.J., Chang, S.H., Jung, H.J. (2012). The simulation of tissue differentiation at a fracture gap using a mechanoregulation theory dealing with deviatoric strains in the presence of a composite bone plate. Composites Part B: Engineering, 43(3), 978-987. https://doi.org/10.1016/j.compositesb.2011.09.011Klein, K.F., Hu, J., Reed, M.P., Hoff, C.N., Rupp, J.D. (2015). Development and validation of statistical models of femur geometry for use with parametric finite element models. Annals of biomedical engineering, 43(10), 2503-2514. https://doi.org/10.1007/s10439-015-1307-6Li, J., Li, Z., Ye, L., Zhao, X., Coates, P., Caton-Rose, F. (2017). Structure and biocompatibility improvement mechanism of highly oriented poly (lactic acid) produced by solid die drawing. European Polymer Journal, 97, 68-76. https://doi.org/10.1016/j.eurpolymj.2017.09.038Li, J., Qin, L., Yang, K., Ma, Z., Wang, Y., Cheng, L., Zhao, D. (2020). Materials evolution of bone plates for internal fixation of bone fractures: A review. Journal of Materials Science & Technology, 36, 190-208. https://doi.org/10.1016/j.jmst.2019.07.024Li, J., Yin, P., Zhang, L., Chen, H., Tang, P. (2019). Medial anatomical buttress plate in treating displaced femoral neck fracture a finite element analysis. Injury, 50(11), 1895-1900. https://doi.org/10.1016/j.injury.2019.08.024Liu, B., Zhang, S., Zhang, J., Xu, Z., Chen, Y., Liu, S., Yang, L. (2019). A personalized preoperative modeling system for internal fixation plates in long bone fracture surgery-A straightforward way from CT images to plate model. The International Journal of Medical Robotics and Computer Assisted Surgery, 15(5), e2029. https://doi.org/10.1002/rcs.2029McClellan, R.T. (2013). The variable angle hip fracture nail relative to the Gamma 3: A finite element analysis illustrating the same stiffness and fatigue characteristics. Advances in orthopedics, 2013. https://doi.org/10.1155/2013/143801Murr, L.E. (2016). Frontiers of 3D printing/additive manufacturing: from human organs to aircraft fabrication. Journal of Materials Science & Technology, 32(10), 987-995. https://doi.org/10.1016/j.jmst.2016.08.011Narayanan, G., Vernekar, V.N., Kuyinu, E.L., Laurencin, C.T. (2016). Poly (lactic acid)-based biomaterials for orthopaedic regenerative engineering. Advanced drug delivery reviews, 107, 247-276. https://doi.org/10.1016/j.addr.2016.04.015Nurettin, D., Burak, B. (2018). Feasibility of carbon-fiber-reinforced polymer fixation plates for treatment of atrophic mandibular fracture: A finite element method. Journal of Cranio-Maxillofacial Surgery, 46(12), 2182-2189. https://doi.org/10.1016/j.jcms.2018.09.030Parthasarathy, J. (2015). 14 Additive Manufacturing of Medical Devices. Additive Manufacturing: Innovations, Advances, and Applications, 369.Ridzwan, M., Shuib, S., Hassan, A., Shokri, A., Ibrahim, M. (2006). Optimization in implant topology to reduce stress shielding problem. Journal of Applied Sciences, 6(13), 2768-2773. https://doi.org/10.3923/jas.2006.2768.2773Sariali, E., Mouttet, A., Pasquier, G., Durante, E. (2009). Three-dimensional hip anatomy in osteoarthritis: analysis of the femoral offset. The Journal of arthroplasty, 24(6), 990-997. https://doi.org/10.1016/j.arth.2008.04.031Singh, D., Singh, R., Boparai, K.S. (2018). Development and surface improvement of FDM pattern based investment casting of biomedical implants: A state of art review. Journal of Manufacturing Processes, 31, 80-95. https://doi.org/10.1016/j.jmapro.2017.10.026Spiridon, I., Tanase, C.E. (2018). Design, characterization and preliminary biological evaluation of new lignin-PLA biocomposites. International journal of biological macromolecules, 114, 855-863. https://doi.org/10.1016/j.ijbiomac.2018.03.140Tang, G., Liu, S.L., Wang, D.M., Wei, G.F., Wang, C.T. (2013). Finite element analysis in femoral fixation with TA3 titanium compressioll plate. In Advanced Materials Research, 647, 16-19. Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/AMR.647.16Tymrak, B., Kreiger, M., Pearce, J.M. (2014). Mechanical properties of components fabricated with open-source 3-D printers under realistic environmental conditions. Materials & Design, 58, 242-246. https://doi.org/10.1016/j.matdes.2014.02.038Wang, A.Y., Peng, J., Sun, M.X., Sui, X., Wang, X., Tian, Y., Lu, S.B. (2006). Biomechanical comparison of different structural bone grafting in femoral heads' defects of weight-bearing region. Journal of Medical Biomechanics, 4.Wang, J., Ma, J.X., Lu, B., Bai, H.H., Wang, Y., Ma, X.L. (2020). Comparative finite element analysis of three implants fixing stable and unstable subtrochanteric femoral fractures: Proximal Femoral Nail Antirotation (PFNA), Proximal Femoral Locking Plate (PFLP), and Reverse Less Invasive Stabilization System (LISS). Orthopaedics & Traumatology: Surgery & Research, 106(1), 95-101. https://doi.org/10.1016/j.otsr.2019.04.027Wang, X., Xu, S., Zhou, S., Xu, W., Leary, M., Choong, P., Xie, Y.M. (2016). Topological design and additive manufacturing of porous metals for bone scaffolds and orthopaedic implants: A review. Biomaterials, 83, 127-141. https://doi.org/10.1016/j.biomaterials.2016.01.012Wu, C., Zheng, K., Fang, J., Steven, G.P., Li, Q. (2020). Time-dependent topology optimization of bone plates considering bone remodeling. Computer Methods in Applied Mechanics and Engineering, 359, 112702. https://doi.org/10.1016/j.cma.2019.112702Wu, K.J., Li, S.H., Yeh, K.T., Chen, H., Lee, R.P., Yu, T.C., Wang, J.H. (2019). The risk factors of nonunion after intramedullary nailing fixation of femur shaft fracture in middle age patients. Medicine, 98(29). https://doi.org/10.1097/MD.0000000000016559Wu, X., Wang, Z., Li, H., Li, Y., Wang, H., Tian, W. (2019). Biomechanical evaluation of osteoporotic fracture: Metal fixation versus absorbable fixation in Sawbones models. Injury, 50(7), 1272-1276. https://doi.org/10.1016/j.injury.2019.05.023Zhao, X., Niinomi, M., Nakai, M., Hieda, J., Ishimoto, T., Nakano, T. (2012). Optimization of Cr content of metastable β-type Ti-Cr alloys with changeable Young's modulus for spinal fixation applications. Acta biomaterialia, 8(6), 2392-2400. https://doi.org/10.1016/j.actbio.2012.02.01

Subordination of pieces during the measurements with M.M.C

[EN] This Coordinate Measuring Machines (C.M.M.) has had an increasingly important role throughout history. We are talking to an enterprise-level quality control. A system that is being implemented in all companies, and has developed some tools to control a variety of parameters such as production stabilization. In this paper, we first set out an introduction to the use of C.M.M. as tools for quality control in SME's. Then we explore the importance of piece positioning and clamping before being measured in a C.M.M. We finally analyze four possible moorings, and deviations are obtained. These moorings are designed in order to place the same work piece in the four cases. Finally, the results obtained are compared and show which is the best way to put the part on the C.M.M.[ES] Las Máquinas de Medir por Coordenadas (M.M.C) han determinado a lo largo de su historia un papel cada vez más importante. Estamos hablando a un nivel empresarial, del control de calidad. Un sistema que se está implementando en todas las empresas, y que desarrolla unas herramientas para controlar una serie de parámetros con tal de estabilizar una producción a nivel estándar. En este trabajo, se expone en primer lugar una introducción al uso de las M.M.C. como herramientas de control de calidad en las Pymes. Después, se profundiza en la importancia que tiene la colocación y el amarre de una pieza antes de ser medida en una M.M.C. Para ello, se analizan cuatro posibles amarres, y se obtienen las desviaciones que se producen en cada uno de ellos. Estos amarres están diseñados para la colocación de una misma pieza en los cuatro casos. En último lugar, se comparan los resultados obtenidos y se muestra cual es la mejor forma de situar la pieza en la máquina M.M.C.Sellés Cantó, MÁ.; Peydro Rasero, MÁ.; Pérez Bernabeu, E.; Gisbert Soler, V. (2012). Sujeción de piezas durante las mediciones con M.M.C. 3c Tecnologia. 1(2):49-72. http://hdl.handle.net/10251/33495S49721

Nuevas perspectivas en la docencia y el teletrabajo

El impacto de las tecnologías ha llegado a la redefinición de una sociedad basada en una producción agrícola para dar lugar a la producción del conocimiento. La nueva sociedad de la información exige empresas cada vez más ágiles, más globalizadas y competitivas, sensibles a los cambios y que reaccionen rápidamente ante las variaciones del mercado, donde ya no importa la ubicación física de la misma ya que la tecnología de la comunicación permitirá subsanar la mayoría de los inconvenientes temporales. En una nueva era donde se da paso al poder del conocimiento que permite productos y servicios cada vez más dinámicos y personalizados parece haber terminado la producción en serie dando lugar a un proceso donde el trabajo sigue al hombre. Este nuevo concepto que se introduce en la era digital al que denominamos teletrabajo permite el acceso a fuentes de trabajo sin distinción de sexo, edad, ubicación y/o discapacidad física ya que gracias a las tecnologías disponibles y al buen aprovechamiento de las mismas podemos igualar las condiciones de acceso al trabajo para muchos que hoy no lo tienen. Este manejo de tecnología como email, video conferencia, navegar por Internet, telefonía, chat, es algo muy común e incorporado en su vida cotidiana para los niños de la actualidad y que seguramente lo incorporarán a su vida laboral cuando lleguen a ser profesionales. Por este motivo se necesitarán profesionales cada vez más ágiles y con destreza para ser competitivos en su vida personal y laboral y por lo tanto se necesitaran docentes con aptitudes y actitudes pro-activas que colaboren en el proceso educativo. En la actualidad la colaboración entre la Universidad y otras instituciones públicas y privadas en investigación y formación es un hecho concreto. Muchas empresas privadas y administraciones públicas se han acercado a la Universidad demandando servicios y ésta última a través de sus propios profesionales vuelca sus saberes a la comunidad realizando asistencia técnica a departamentos de Recursos Humanos, asesoramiento en los programas de formación, en el uso de materiales, en la didáctica, en la formación multimedia que facilita el autoaprendizaje, etc.Eje: Educación universitaria: Experiencias uso NTICRed de Universidades con Carreras en Informática (RedUNCI

Study regarding complex shapes manufacturing using CAM

In the case of complex cavities shapes, manufacture using classical methods proved to be a very difficult process. Classical methods imply splitting the part in many leveling planes, the distance between them being given by the depth of the cut and the feeding rate. The purpose of this paper is to present how cavities are made using CAM softwares, mainly SolidCAM and how fast this method is in comparison with the classical one. A mold cavity of a complex shape is presented as the example of this aspect. The cavity of the mold was made using 3 axes machine tool equipped with Heidenhain CNC control.Flavius, AA.; Sánchez Caballero, S.; Sellés Cantó, MÁ. (2012). Study regarding complex shapes manufacturing using CAM. Annals of The University of Oradea. 21(4):1-4. http://hdl.handle.net/10251/35931S1421

Double sampling in attribute control charts

A double sampling is applied to attribute control charts, using the methodology that Daudin developed for the X-bar charts. Daudin suggested taking two samples at the same time, and, depending on the circumstances, analyzing the second sample when necessary. This is a simple and easy method for decision making at this level, which has been shown to be effective and efficient for specific cases.Sellés Cantó, MÁ.; Pérez Bernabeu, E.; Juárez Varón, D.; Peydró Rasero, MÁ. (2014). Double sampling in attribute control charts. Annals of The University of Oradea. Fascicle of Management and Technological Engineering. 1(1):99-102. http://hdl.handle.net/10251/57739S991021

Methodology for the calculation of viscosity, using as a case study abs reprocessing

[EN] This paper explains the methodology for calculating the viscosity, using as a case study the recycling of Acrylonitrile-Butadiene-Styrene (ABS). To simulate recycled ABS, virgin ABS was processed through 5 cycles, at extreme processing temperatures, 220ºC and 260ºC. The virgin ABS and the recycled ABS were rheologically characterized after the various cycles of reprocessing in order to evaluate their corresponding properties and correlate them with the number of cycles undergone. The viscosity is expressed using the mathematical model of Cross-WLF. This mathematical model is used to introduce viscosity in Computer Aided Engineering (CAE). The results show that viscosity decreases as the number of reprocessing cycles increases.[ES] En este trabajo se explica la metodología de cálculo de la viscosidad, utilizando como caso práctico el reciclado de un Acrilonitrilo-Butadieno-Estireno (ABS). Para simular el ABS reciclado se ha reprocesado ABS virgen durante cinco ciclos a las dos temperaturas extremas de procesamiento, 220ºC y 260ºC. Se ha caracterizado reológicamente evaluando como cambia su propiedad con respecto al número de ciclos de proceso. Después de calcular la viscosidad, esta, se ha expresado utilizando el modelo matemático de Cross-WLF. Este modelo matemático sirve para introducir la viscosidad en los programas de análisis de simulación de inyección por ordenador (CAE: Computer Aided Engineering). Los resultados muestran que la viscosidad disminuye ligeramente conforme aumenta el número de ciclos de reprocesado.Peydró Rasero, MÁ.; Sellés Cantó, MÁ.; Juárez Varón, D.; Parres Garcia, A. (2012). Metodología para el cálculo de la viscosidad empleando como caso práctico el reprocesado de ABS. 3c Tecnologia. (1):33-47. http://hdl.handle.net/10251/34265S3347