INSTITUTO TECNOLÓGICO TECNOLÓGICO SUPERIOR DE SAN S AN ANDRES TUXTLA INGENIERÍA ELECTROMECANICA
Manual de Prácticas de Laboratorio
Código: MANLAB/IEMPDM Revisión: ASIGNATURA:
NOMBRE DEL MAESTRO(A): M.I.I. JUAN CARLOS CARDENAS TUFIÑO
PROCESOS DE MANUFACTURA
PRÁCTICA NO. 4
NOMBRE DE LA PRÁCTICA:
PRACTICA DE INYECCION DE PLASTICO OBJETIVO:
Aprender a moldear con plástico. Con MEDIDA DE SEGURIDAD: plástico reciclado de tapas de plástico de Mediano botellas, con la máquina de inyección de Bajo riesgo plástico. NOMBRE DEL ALUMNOS(A): ALUMNOS(A): EQUIPO NO.1 SHEILA ALISDALCI AVILEZ TRUJILLO COBIX COTA GERARDO PELAYO AZAMAR ANGEL DE JESUS PEREZ ANOTA EDGAR ULISES RAMIREZ SIXTECO ANGEL ARTURO SOSA VALENZUELA MARIO JOSUE EQUIPO NO.2 ANA MARIA CHONTAL CHIGO CHIGO COBAXIN ACUA ERICK SANTIAGO COLORADO MARTINEZ DIANA CARMEN DIAZ SALEN DANIEL PEREZ HERNANDEZ PEDRO DE JESUS RIVERA POLITO EDILBERTO EQUIPO NO.3 BRAVO HERNANDEZ JAVIER CRUZ CATILLO JULIO LEON CABRERA MAGDIEL LINDO GOMEZ GUSTAVO ADOLFO MENDOZA DELGADO JOSE ENRIQUE POLITO AZAMAR ADRIAN DE JESUS
Alto
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INSTITUTO TECNOLOGICO SUPERIOR DE SAN ANDRES TUXTLA
PRACTICA DE INYECCION DE PLASTICO PROCESOS DE MANUFACTURA Ingeniería Electromecánica 27 de Noviembre de 2015
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INSTITUTO TECNOLÓGICO TECNOLÓGICO SUPERIOR DE SAN S AN ANDRES TUXTLA INGENIERÍA ELECTROMECANICA
Manual de Prácticas de Laboratorio
Código: MANLAB/IEMPDM Revisión:
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INTRODUCCIÓN El diseño actual de la máquina de moldeo por inyección ha sido influido por la demanda de productos con diferentes características geométricas, con diferentes polímeros involucrados y colores. Además, su diseño se ha modificado de manera que las piezas moldeadas tengan un menor costo de producción, lo cual exige rapidez de inyección, bajas temperaturas, y un ciclo de moldeo corto y preciso. John Hyatt registró en 1872 la primera patente de una máquina de inyección, la cual consistía en un pistón que contenía en la cámara derivados celulósicos fundidos. Sin embargo, se atribuye a la compañía alemana Cellon-Werkw el haber sido pionera de la máquina de inyección moderna. Esta firma presentó, en 1928 , una patente incluyendo la descripción de nitrocelulosa ( celuloide ). Debido al carácter inflamable de la nitrocelulosa, se utilizaron posteriormente otros derivados celulósicos como el etanoato de celulosa . Los británicos John Beard y Peter Delafield, debido a ciertas diferencias en la traducción de la patente alemana, desarrollaron paralelamente la misma técnica en Inglaterra, con los derechos de patente inglesa para la compañía F.A. Hughes Ltd. La inyección, es un proceso adecuado para piezas de gran consumo. La materia prima se puede transformar en un producto acabado en un solo paso. Con la inyección se pueden obtener piezas de variado peso y con geometrías complicadas. En ese molde el material se solidifica, comenzando a cristalizar en polímeros semicristalinos . La pieza o parte final se obtiene al abrir el molde y sacar de la cavidad la pieza moldeada. El moldeo por inyección es una técnica muy popular para la fabricación de artículos muy diferentes. Sólo en los Estados Unidos, la industria del plástico ha crecido a una tasa de 12 % anual durante los últimos 25 años, y el principal proceso de transformación de plástico es el moldeo por inyección, seguido del de extrusión . Un ejemplo de productos fabricados por esta técnica son los famosos bloques interconectables LEGO y juguetes Playmobil , así como una gran cantidad de componentes de automóviles, componentes para aviones y naves espaciales. La finalidad del presente documento es aprender la manera en fundir plástico mediante el proceso de fundición por moldeo en una máquina que funde el
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INSTI INSTITUT TUTO O TECNOL TECNOL GICO GICO SUPERI SUPERIOR OR DE SAN SAN ANDRES TUXTLA INGENIERÍA ELECTROMECANICA
Manual de Prácticas de Laboratorio
Código: MANLAB/IEMPDM Revisión:
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INYECCION EN PLASTICO
Proceso de inyección. La inyección, es un proceso adecuado para piezas de gran consumo. La materia prima se puede transformar en un producto acabado en un solo paso. Con la inyección se pueden obtener piezas de variado peso y con geometrías complicadas. Las características más importantes del proceso de inyección son las siguientes:
La pieza se obtiene en una sola etapa. Se necesita poco o ningún trabajo final sobre la pieza obtenida. obtenida. El proceso es totalmente automatizable. Las condiciones de fabricación son fácilmente reproducibles. Las piezas acabadas son de una gran calidad. calidad.
Para el caso de la inyección de plásticos, se han de tener en cuenta las siguientes restricciones:
Dimensiones de la pieza. Tendrán que ser reproducibles y de acuerdo a unos valores determinados, lo que implicará minimizar las contracciones de la misma. Propiedades mecánicas. La pieza deberá resistir las condiciones de uso a las que esté destinada durante un tiempo de vida largo. Peso de la pieza. Es de gran importancia, sobre todo, porque está relacionada con las propiedades de ella. Tiempo de ciclo. Para aumentar la producción será necesario minimizar, en lo posible, el tiempo de ciclo de cada pieza. Consumo energético. Una disminución del consumo energético implicará un menor coste de producción.
Etapas del proceso de inyección. El proceso de obtención de una pieza de plástico por inyección, sigue un orden de operaciones que se repite para cada una de las piezas. Este orden, conocido como ciclo de inyección, se puede dividir en las siguientes etapas:
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Cierre del molde. Con el cierre del molde se inicia el ciclo, preparándolo para recibir la inyección del material fundido. En esta fase se aplica la tuerza de cierre, que es aquella que hace la máquina para mantener cerrado el molde durante la inyección. Depende de la superficie proyectada de la pieza y de la presión real (presión específica), que se tiene en la cavidad del molde.
Inyección. En esta etapa se producen dos fases: fase de llenado y fase de mantenimiento.
Fase de llenado. Una vez cerrado el molde y aplicada la fuerza de cierre, se inicia la fase de llenado del molde (inyección). El husillo de la unidad de inyección inyecta el material fundido, dentro del molde y a una presión elevada; al inyectar, el husillo avanza sin rotación. La duración de esta etapa puede ser de décimas de segundo hasta varios segundos, dependiendo de la cantidad de material a inyectar y de las características del
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El sistema hidráulico ejerce presión sobre el husillo, el cual se mueve axialmente. Esta presión hace que el mismo se mueva hacia delante d elante o hacia la boquilla. El material se expulsa fuera de la cámara de inyección y se introduce en la cavidad dentro del molde. El material fundido solidifica dentro de la cavidad para que la pieza moldeada pueda ser expulsada. Los moldes usados para materiales termoplásticos están sujetos al control de temperatura (enfriamiento). Esto transporta el calor, el cual ha sido introducido al fundir el material, para permitir solidificar el material. Tan pronto como el material que se moldea contacta con el molde en la operación de inyección, comienza a enfriarse y a solidificar. Por este motivo la inyección debe ocurrir rápidamente, con lo que la cavidad se llena mientras que el material se encuentre fundido. Esto requiere presiones muy grandes ya que el compuesto es muy viscoso, a pesar de las temperaturas elevadas. El material fundido debe superar la resistencia ofrecida por la fricción, en la boquilla y cavidad. Las presiones, en el interior del molde, son altísimas a causa de la inyección; por lo que la unidad de cierre debe ser capaz de mantener el molde cerrado, en oposición a estas presiones. Durante el enfriamiento el material se contrae dentro del d el molde. Por este motivo se ha de añadir más material para que el volumen de la pieza sea el deseado. En esta fase de mantenimiento, que es posterior a la del llenado en la inyección, la
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La temperatura del molde. Nivel de presión de mantenimiento. Ajuste del tiempo de mantenimiento.
Este tiempo dependerá mucho del material que estemos inyectando y del grosor que tenga la pieza que se inyecte. Tiene especial relevancia cuando se emplean materiales semicristalinos, pues las diferencias de volúmenes específicos son considerables entre su estado líquido y el sólido. Para ajustar el tiempo de mantenimiento, se recurre a la construcción de una curva que relacione los pesos de las piezas inyectadas con el tiempo para la presión de mantenimiento.
Plastificación o dosificación. Después de aplicar la presión de mantenimiento, comienza a girar el husillo; de forma que el material va pasando progresivamente de la tolva de alimentación a la cámara de inyección, homogeneizándose tanto su temperatura como su grado de mezcla. Esta fase se realiza en forma paralela a la etapa de enfriamiento, acelerando así el tiempo total de ciclo. A medida que el husillo va transportando el material hacia delante, éste sufre un retroceso debido a la acumulación que se produce en la zona delantera. El retroceso del husillo finaliza cuando éste ha llegado a una posición definida con anterioridad. En este
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tiempo de refrigeración que necesita la pieza inyectada. Un tiempo largo de carga provoca una masa fundida homogénea. Una velocidad excesivamente alta puede generar la presencia de infundidos y una homogeneización insuficiente del material en el interior del cilindro.
LA CONTRAPRESIÓN Tiene como función principal, garantizar una adecuada plastificación y homogenización del material, también tiene como función, frenar el retroceso del husillo en la etapa de plastificación. Un aumento de la contrapresión implica que aumente el tiempo de plastificación, la compresión sobre el material y, por tanto, la cantidad de material acumulado y la temperatura de la masa fundida. Al contrario, contrapresiones bajas pueden dar lugar a piezas inconsistentes y una insuficiente homogeneización del material.
LA SUCCIÓN Se utiliza principalmente para reducir el goteo de material. Normalmente se suele trabajar con descompresión pequeña o nula.
Apertura del molde y expulsión de la pieza. Cuando se considera que el material de la pieza ha alcanzado la temperatura
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El objetivo de ello es conseguir una consistencia tal, que impida su deformación al ser expulsada. Las variables que más afecta en esta fase es la temperatura de molde. La fase de mantenimiento termina cuando solidifica el bebedero o el punto de inyección. A partir de entonces ya no entra más material en la cavidad. Durante las fases de llenado y mantenimiento, el material dentro de la cavidad ya ha comenzado a solidificar contra la pared del molde que está más fría. Las capas más externas solidifican antes. El tiempo de enfriamiento empieza con la inyección. El enfriamiento es más lento hacia el centro de la pieza ya que los plásticos son poco conductores del calor. El calor cedido por la solidificación se disipa a través de las capas más externas de las paredes del molde. El tiempo de enfriamiento depende del tipo de pieza que se enfría dentro del molde . No es necesario esperar que toda la pieza enfríe hasta la temperatura del mismo; sino que, es suficiente que estén frías las regiones externas de la pieza, para poder extraerla en condiciones estables.
CONTAMINACION AMBIENTAL La sociedad industrial ha centrado tradicionalmente su atención en la producción de objetos con lo que se ha dado prioridad siempre a los requerimientos del producto principal de cara a la satisfacción de las necesidades del mercado. El consumo de materias primas (recursos naturales, incluida el agua potable y la energía),
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La contaminación ha estado presente en todo momento en menor o mayor grado, conforme las necesidades del hombre han ido aumentando también el consumo y de la la misma manera los desechos que estos producen. A medida que aumenta el poder del hombre sobre la naturaleza y aparecen nuevas necesidades y como consecuencia de sus acciones el medio se deteriora cada vez más. El comportamiento del hombre ha cambiado, sus valores y el empeño por cuidar el ambiente ha ido disminuyendo, es así como ahora en la actualidad las consecuencias se han vuelto irremediables. El agua, el suelo y el aire contaminado son causados única y exclusivamente por el hombre ya sea por los desechos producidos día a día, el daño causado para la salud, generando inseguridad y así perjudicando nuestra calidad de vida.
PET Es utilizada por las empresas para la venta de sus productos, en su mayoría mayoría bebidas, materia proveniente del petróleo. El cual empezó a ser utilizado como materia prima en fibras para la industria textil y la producción de films. El PET (Poli Etilén Tereftalato) perteneciente al grupo de los
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posterior traslado a las plantas de transferencia. El reciclaje, al margen de su complejo proceso de transformación, es uno de los puntos básicos de estrategia de tratamiento de residuos 3R.
Reducir , acciones para reducir la producción de objetos susceptibles de convertirse en residuos. Reutilizar , acciones que permiten el volver a usar un producto para darle una segunda vida, con el mismo uso u otro diferente. Reciclar , el conjunto de operaciones de recogida y tratamiento de residuos que permiten reintroducirlos en un ciclo de vida. Conservar los recursos naturales implica en primer lugar tanto la reducción de su consumo como el aumento de la eficiencia en su transformación en bienes utilizables. Y, en segundo lugar, es necesario llevar a cabo un conjunto de buenas prácticas que permitan el máximo aprovechamiento de estos, con una reducción significativa de su impacto ambiental tanto en el medio atmosférico como en el edáfico y el hídrico, todos ellos interrelacionados.
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INSTITUTO TECNOLÓGICO TECNOLÓGICO SUPERIOR DE SAN S AN ANDRES TUXTLA INGENIERÍA ELECTROMECANICA
Manual de Prácticas de Laboratorio
Código: MANLAB/IEMPDM Revisión:
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1.- ¿Qué es Proceso de Inyección? Es un proceso adecuado para piezas de gran consumo. La materia prima se puede transformar en un producto acabado en un solo paso. Con la inyección se pueden obtener piezas de variado peso y con geometrías complicadas.
2.- ¿Cuáles son las características del proceso de inyección? Las características más importantes del proceso de inyección son las siguientes:
La pieza se obtiene en una sola etapa. Se necesita poco o ningún trabajo final sobre la pieza obtenida. obtenida. El proceso es totalmente automatizable. Las condiciones de fabricación son fácilmente reproducibles. Las piezas acabadas son de una gran calidad.
3.- ¿Cuáles son las restricciones que se deben tomar en cuenta para llevar a cabo el proceso de inyección?
Dimensiones de la pieza. Tendrán que ser reproducibles y de acuerdo a unos valores determinados, lo que implicará minimizar las contracciones de
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5.- ¿Cómo se puede definir al reciclaje? Es un término empleado de manera general para describir el proceso de utilización de elementos o partes de un artículo que todavía pueden ser usadas a pesar de pertenecer a algo que ya llegó al final de su vida útil.
6.- ¿Cómo está relacionado el reciclaje con la contaminación ambiental? Está estrechamente relacionado, porque al llevar a cabo el reciclaje de plástico o reutilización de estos, estamos contribuyendo a evitar que estos residuos terminen en calles o ríos contaminando aún más nuestro planeta. Ya que la sociedad industrial ha centrado tradicionalmente su atención en la producción de objetos con lo que se ha dado prioridad siempre a los requerimientos del producto principal de cara a la satisfacción de las necesidades del mercado.
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INSTI INSTITUT TUTO O TECNOL TECNOL GICO GICO SUPERI SUPERIOR OR DE SAN SAN ANDRES TUXTLA INGENIERÍA ELECTROMECANICA
Manual de Prácticas de Laboratorio
Código: MANLAB/IEMPDM Revisión:
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PROCESO DE MOLDEO EN INYECCION DE PLASTICO. PL ASTICO. A continuación se explicaran los pasos a seguir para poder llevar a cabo la inyección de plástico. Esta práctica se llevara a cabo con plástico triturado el cual ha sido reutilizado, ayudando así a la preservación del planeta. Materiales: -
Moldeadora por inyección de plástico Moldes para el acabado de la inyección Espátula Cucharon
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1.- Para poder dar inicio a la inyección es necesario el verificar que la máquina de inyección este energizada, el cual se podrá dar cuenta mediante una luz led. Se pasa a encender la máquina y esperar a que caliente hasta llegar a los 185C°.
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3.-Para que se pueda hacer un uso adecuado de la máquina es necesario el cuidado del llenado del depósito del material, ya que se debe procurar que no se llene de más ya que esto podría afectar al momento de bajar el tubo para poder llevar a cabo la inyección.
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4.- Otro paso importante es la colocación del molde, donde se depositara el plástico derretido obteniendo así una figura de acuerdo al molde colocado Para poder colocarlo se debe girar una palanca que se encuentra en la parte izquierda de la máquina, donde una vez puesto el molde se pasara a volver a girar la palanca para poder llevar a cabo el cerrado del molde.
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5.- Una vez hecho todo lo anterior y teniendo en cuenta que la temperatura ha llegado a 185C° pasaremos a elaborar la inyección del plástico, donde solamente se girara una palana que se encuentra en la parte derecha de la máquina, la cual bajara un tubo que hará comprimir el plástico derretido para que pueda ir saliendo
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6.-Para finalizar se volverá a abrir el molde el cual se hará de la misma manera en la que fue puesto el molde.
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8.- Teniendo como resultado las siguientes figuras plásticas.
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INSTITUTO TECNOLÓGICO TECNOLÓGICO SUPERIOR DE SAN S AN ANDRES TUXTLA INGENIERÍA ELECTROMECANICA
Manual de Prácticas de Laboratorio
Código: MANLAB/IEMPDM
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RESULTADOS. Como etapa final de esta práctica se llegaron a resultados favorables, puesto que no surgió algún problema durante la práctica excepto que algunas piezas salieron incompletas. El resultado de las piezas fueron estas:
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Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.