CAPITULO1: LA ESTRUCTURA DE LOS METALES PREGUNTAS DE REPASO 1. Explique la diferencia entre una celda unitario y un monocristal
R.
CELDA UNITARIO
CELDA MONOCRISTAL
Una celda unitario es el grupo mas pequeño de átomos que muestra la estructura cristalina característica de un metal en particular. Un monocristal consiste de un número de celdas unitarias; algunos ejemplos son chips para dispositivos semiconductores y álabes de la turbina. 2. En las tablas sobre estructuras cristalinas el hierro aparece listado como estructura tanto bcc como fcc ¿Por qué? R. Porque son los diferentes tipos de arreglos atomicos básicos, estructuras cristalina básica centrada en el cuerpo (bcc,por sus siglas en ingles) y estructura cristalina cubica centrada en la cara (fcc, por sus siglas en ingles) 3. Defina anisotropía ¿Qué materiales usted puede pensar distinto a los metales que exhiban un comportamiento comportamient o anisotropico? anisotropico ? R. Obsérvese en la figura que, como resultado de la deformación plástica, los granos se han alargado en una dirección y contraído en la otra. En con-secuencia, esta pieza de metal se ha vuelto anisotrópica, y por lo tanto, sus propiedades enla dirección vertical son diferentes de aquéllas en la dirección horizontal. Muchos productos desarrollan anisotropía de propiedades mecánicas después de haberse procesado mediante técnicas de trabajo de los metales. El grado de anisotropía depende decuán uniformemente se deforma el metal; obsérvese en la dirección de la grieta en la figura1.13a, por ejemplo, que la ductilidad de la hoja laminada en frío en la dirección transversal (vertical) es menor que aquélla en su dirección de laminado (longitudinal).La anisotropía influye tanto en las
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f) Características de la Maquina Herramienta g) Sujeciones y soportes de la pieza de trabajo. Variables Dependientes. Son aquellas que afectan los cambios en las variables independientes e incluyen: a) Tipo de viruta Producida. b) Fuerza y Energía disipada en el corte c) Elevación de Temperatura en la pieza de trabajo, la HC y l viruta. d) Desgaste y Falla de la HC. e) Acabado Superficial e Integridad de la superficie de la pieza de trabajo.
20.2.- Explique cual es la diferencia entre angulo de ataque positivo y negativo
R.-si el angulo formado por la superficie de ataque y la perpendicular queda fuera de la cuña se dice que es positivo, si dicho angulo queda dentro de la herramienta se tiene un angulo de ataque negativo.
20.3.- diferencia entre virutas continuas y segmentadas
R.- Viruta continua Se suele formar con materiales dúctiles a grandes velocidades de corte y/o con grandes ángulos de ataque (entre 10° y 30°). La deformación del material se efectúa a lo largo de una zona de cizallamiento angosta, llamada primera zona de corte. Las virutas continuas pueden, por la fricción, desarrollar una zona secundaria de corte en la interface entre herramienta y viruta. Dichazona secundaria se vuelve más gruesa a medida que aumenta la fricción entre la herramienta y la viruta.De forma general, g eneral, las virutas continuas producen buen acabado superficial (liso). Las virutas continuas no siempre son deseables, en especial en máquinas CNC, porque tienden a enredarse en los portaherramientas, los soportes y la pieza, así como en los sistemas de eliminación de viruta, por lo que se debe de parar la operación para apartarlas. Tal problema se puede solucionar con los rompevirutas (reduce la viruta y la corta en tramos cortos) y cambiando los parámetros del maquinado, como la velocidad de corte, el avance y los fluidos de corte Viruta escalonada o segmentada Son semicontinuas, con zonas de alta o baja deformación por cortante. Los metales de baja conductividad térmica y resistencia que disminuye rápidamente con la temperatura, como el titanio, muestran ese comportamiento. Las virutas tienen un aspecto de diente de sierra por la
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Las propiedades del producto final dependen del material original y su historia de procesamiento. Se deben evitar grandes variaciones en el tamaño de las secciones transversales y cambios abruptos en la geometría geometría para obtener mejor calidad en el producto y mayor mayor vida del molde.
16.- ¿Qué es la pultrusion?, ¿Qué es el pul formado? R.- La pultrusion es un proceso productivo de conformado de materiales plásticos termo plásticos termo rígidos para obtener perfiles de plástico reforzado, de forma continua, sometiendo las materias primas a un arrastre y parado por operaciones de impregnado, conformado, curado y corte. Este proceso se caracteriza por un buen acabado superficial. El pul formado es un proceso que convierte las piezas reforzadas en forma continua sin secciones transversales y constantes. 17.- Describa los principales procesos de manufactura para para fabricar materiales materiales compuestos compuestos con matriz de metal R.- se sigue los siguientes procesos que que son:
fundamentalmente en colar la matriz de líquido y Procesamiento en fase liquida: consiste fundamentalmente el refuerzo solido con alguno de los procesos convencionales de colado como vimos en el capítulo 11, o el colocado con infiltración de presión. Procesos en fase solida: consiste en métodos de metalurgia de polvos, incluyendo el prensado isostático frio o caliente. Es importante el mezclado adecuado para obtener una distribución homogénea en las fibras. Procesamiento en dos fases: consiste en el “rheocasting”, y en automatización y deposición. En los últimos procesos se mezclan las fibras de refuerzo con una matriz que contiene fases liquida y sólida en el mismo tiempo.
18.- ¿Cómo se producen las láminas y membranas gruesas de plástico? R.-La lamina se produce usando un dado plano de extrusión, se extruye forzándolo a pasar a tr avés de un dado de diseño especial los cual la lámina extruida es tomada primero por rodillos r odillos enfriados por agua. 19.- ¿Cómo se producen los vasos de espuma? R.- Se coloca unas perlas perlas de poliestireno en un molde con agente espumante espumante y se exponen al calor, normalmente clon vapor de agua. En consecuencia las perlas se expanden hasta 50 veces su tamaño original y toman la forma forma del molde ósea en en este caso un vaso. Se Se puede controlar la cantidad de expansión con temperatura y tiempo. 20.- Si un polímero está en en forma de una una lámina delgada, delgada, es un termoplástico o es un termofijo ¿Por qué? R.- Depende si la lámina ya fue moldeada sería un termofijo pero sino sería un termoplástico
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Cuestionario Capitulo 19
1.- ¿Qué es estereolitografia? R.- Es un proceso muy común para obtener prototipos rápidos. La estereolitografía es una forma de tecnología de manufactura utilizada para la producción de modelos, prototipos, patrones, o piezas definitivas. Es la técnica de prototipado y fabricación rápida más antigua. 2.- ¿Qué se pueden fabricar de piezas de papel con prototipo rápido? R.- Como Como vemos en las imágenes imágenes se pueden pueden fabricar fabricar varias piezas: piezas:
3.- ¿Qué es prototipo virtual y en que difiere de los métodos aditivos? R.- Es una forma totalmente programada de producir prototipos, aprovecha los ambientes avanzados de gráficas y de realidad virtual para permitir a los diseñadores examinar una pieza. En cierto sentido esta tecnología la usan usan los paquetes de CAD para presentar una pieza pieza de modo que la pueda observar y evaluar tal como está dibujado, dibujado, se debe reconocer reconocer que los sistemas de prototipo virtual son casos extremos de de presentación de detalles. Esta se diferencia por por su presentación de piezas en forma instantánea para su evaluación, tienen curvas de aprendizaje pronunciadas. 4.- ¿Qué es modelado por deposición de fundido (FDM)?
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5.- ¿Cuáles son los pasos para producir una pieza con curado en base sólida? R.- son: 1. Una vez creada la rebaba con base de cómputo, se imprime su mascarilla en una lámina de vidrio, mediante un proceso de impresión electrostática parecido a la de las impresoras láser. 2. Mientras se prepara la mascarilla se deposita una capa delgada de polímero fotoreactico en la superficie de trabajo y se reparte uniformemente. 3. La fotomascarilla se coloca sobre la superficie de trabajo y se enciende un reflector ultravioleta que la ilumina. Donde la mascarilla es transparente, la luz llega a curar al polímero y endurece la rebanada que se pretende. 4. La resina no afectada todavía líquida se aspira y se quita de la superficie. 5. Se reparte cera liquida soluble en agua por el área de trabajo que llena las cavidades que antes ocupaba el polímero liquido no expuesto a la luz. 6. A continuación de maquina la capa para obtener el espesor correcto y una buena planitud. 7. El proceso se repite capa tras capa, hasta completar la parte. 6.- ¿Qué quiere decir herramientas rápidas? R.- Es aplicación de operaciones de prototipos en tiempos más cortos para producción de piezas individuales, en comparación de otros métodos. 7.- Describa los métodos de producción de partes metálicas con los procesos descritos en este capítulo. R.- En unos de los métodos se muestra una operación de fundición en arena, en la que se ha fabricado las placas del molde mediante métodos de prototipo rápido y el resto del del proceso es idéntico a la fundición convencional en arena. Otra aplicación común es el del moldeo moldeo por inyección en este caso el molde se fabrica mediante prototipo rápido y se usa en las máquinas de moldeo por inyección. Para la producción de las herramientas se usan dos métodos: un termoplástico de alto punto de fusión o un termofijo estable.
Cuestionario Capitulo 20 20.1.- haga una lista de la variables en el corte de metales
R.- Variables Independientes. Independientes. Esenciales en un proceso de corte. a) Forma Acabado Superficial y Filo de la HC
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propiedades mecánicas como en las físicas. Por ejemplo, las hojas de acero para transformadores eléctricos se lamina de tal manera que la deformación resultante imparta propiedades magnéticas anisotrópicas a la hoja. Este arreglo reduce las pérdidas magnéticas por histéresis y mejora la eficiencia de los transformadores. Existen dos tipos generalesde anisotropía en los metales: la orientación preferida y la fibración mecánica .
El agua dentro de un tubo hervidor de una caldera o la atmosfera terrestre exhiben un comportamiento anisotropico
4. ¿Qué efectos tiene la re cristalización cristalizació n en las propiedades de los metales? R.- Como se ve en la figura la dureza es reducida,la ductilidad es incrementada y los esfuerzos residuales son relevados.
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20.5.- hay alguna ventaja en tener borde acumulado
R.- No por que no afecta a las propiedades 20.6.- cual es la función de los rompevirutas
R.-reduce la viruta y la corta en tramos cortos 20.7.- cuales son las fuerzas en una operación de corte
R.- Fuerzas de Corte Una operación de maquinado requiere de equipos que consumen cierta potencia. Esta potencia depende de las fuerzas de corte y velocidades presentes en el proceso de corte. Se distinguen: la Fuerza de Corte, la Fuerza de Alimentación y la Fuerza de Empuje
Fuerzas de corte en el Proceso de Torneado: Fc: Fuerza de Corte, Fa: Fuerza de Alimentación o Avance y Fp: Fuerza de Empuje
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