{"id":603,"date":"2018-10-17T00:14:55","date_gmt":"2018-10-16T16:14:55","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=603"},"modified":"2018-10-17T00:14:55","modified_gmt":"2018-10-16T16:14:55","slug":"chapter-25-1-residual-stress","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/es\/2018\/10\/17\/capitulo-25-1-tensiones-residuales\/","title":{"rendered":"Cap\u00edtulo 25-1, Tensiones residuales"},"content":{"rendered":"<h1>Un culpable de los problemas de contracci\u00f3n y alabeo<\/h1>\n<p>La tensi\u00f3n residual es una tensi\u00f3n inducida por el proceso, congelada en una pieza moldeada. Puede ser inducida por el flujo o inducida t\u00e9rmicamente. Las tensiones residuales afectan a una pieza de forma similar a las tensiones aplicadas externamente. Si son lo suficientemente fuertes como para superar la integridad estructural de la pieza, \u00e9sta se deformar\u00e1 en el momento de la expulsi\u00f3n o, m\u00e1s tarde, se agrietar\u00e1 cuando se aplique una carga de servicio externa. Las tensiones residuales son la causa principal de la contracci\u00f3n y el alabeo de la pieza. Las condiciones del proceso y los elementos de dise\u00f1o que reducen la tensi\u00f3n de cizallamiento durante el llenado de la cavidad ayudar\u00e1n a reducir la tensi\u00f3n residual inducida por el flujo. Del mismo modo, los que promueven un empaquetado suficiente y un enfriamiento uniforme del molde reducir\u00e1n la tensi\u00f3n residual inducida t\u00e9rmicamente. En el caso de los materiales rellenos de fibra, las condiciones de proceso que favorecen la uniformidad de las propiedades mec\u00e1nicas reducir\u00e1n la tensi\u00f3n residual t\u00e9rmica.\u00a0<a title=\"Proveedor de moldes de China\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Proveedor de moldes de China<\/a><\/p>\n<h1>Tensi\u00f3n residual inducida por el flujo<\/h1>\n<p>Las mol\u00e9culas de pol\u00edmero de cadena larga sin tensi\u00f3n tienden a conformarse en un estado de equilibrio de espiral aleatoria a temperaturas superiores a la temperatura de fusi\u00f3n (es decir, en estado fundido). Durante el procesado, las mol\u00e9culas se orientan en la direcci\u00f3n del flujo, a medida que el pol\u00edmero se cizalla y se alarga. Si la solidificaci\u00f3n se produce antes de que las mol\u00e9culas del pol\u00edmero se relajen completamente hasta su estado de equilibrio, la orientaci\u00f3n molecular queda bloqueada dentro del<br \/>\npieza moldeada. Este tipo de estado de tensi\u00f3n congelada suele denominarse tensi\u00f3n residual inducida por flujo. Debido a la orientaci\u00f3n molecular estirada en la direcci\u00f3n del flujo, introduce propiedades mec\u00e1nicas y de contracci\u00f3n anisotr\u00f3picas y no uniformes en las direcciones paralela y perpendicular a la direcci\u00f3n del flujo.<\/p>\n<h2>Orientaci\u00f3n molecular congelada<\/h2>\n<p>Debido a la combinaci\u00f3n de una alta tensi\u00f3n de cizallamiento y una alta velocidad de enfriamiento adyacente a la pared del molde, hay una capa altamente orientada congelada inmediatamente debajo de la superficie de la pieza. Esto se ilustra en la figura 1. La exposici\u00f3n posterior de una pieza con altas tensiones de flujo residuales (u orientaci\u00f3n congelada) a altas temperaturas puede permitir que se alivien algunas de las tensiones. Esto suele provocar la contracci\u00f3n y el alabeo de la pieza. Debido al efecto aislante t\u00e9rmico de las capas congeladas, el pol\u00edmero fundido en el n\u00facleo caliente puede relajarse en mayor grado, lo que da lugar a una zona de baja orientaci\u00f3n molecular.\u00a0<a title=\"Proveedor de moldes de China\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Proveedor de moldes de China<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1303\" title=\"Congelado-en-molecular-orienta\" src=\"https:\/\/web.archive.org\/web\/20130131102842im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Frozen-in-molecular-orienta.gif\" alt=\"Congelado-en-molecular-orienta\" width=\"579\" height=\"258\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>FIGURA 1.<\/strong>\u00a0El desarrollo de tensiones de flujo residuales debidas a la orientaci\u00f3n molecular congelada durante las etapas de llenado y empaquetado.<br \/>\n(1) Zona de alto enfriamiento, cizallamiento y orientaci\u00f3n (2) Zona de bajo enfriamiento, cizallamiento y orientaci\u00f3n<\/p>\n<h2>Reducci\u00f3n de la tensi\u00f3n residual inducida por el flujo<\/h2>\n<p>Las condiciones del proceso que reducen la tensi\u00f3n de cizallamiento en la masa fundida reducir\u00e1n el nivel de tensiones residuales inducidas por el flujo. En general, la tensi\u00f3n residual inducida por flujo es un orden de magnitud menor que la tensi\u00f3n residual inducida t\u00e9rmicamente.\u00a0<a title=\"Proveedor de moldes de China\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Proveedor de moldes de China<\/a><\/p>\n<ul>\n<li>mayor temperatura de fusi\u00f3n<\/li>\n<li>mayor temperatura de la pared del molde<\/li>\n<li>mayor tiempo de llenado (menor velocidad de fusi\u00f3n)<\/li>\n<li>disminuci\u00f3n de la presi\u00f3n de embalamiento<\/li>\n<li>trayecto de flujo m\u00e1s corto.<\/li>\n<\/ul>\n<h1>\u00a0Tensi\u00f3n residual inducida t\u00e9rmicamente<\/h1>\n<p>La tensi\u00f3n residual inducida por el calor se produce por las siguientes razones:<\/p>\n<ul>\n<li>El material se encoge a medida que la temperatura desciende desde los ajustes del proceso hasta las condiciones ambientales alcanzadas al finalizar el proceso.<\/li>\n<li>Los elementos de material experimentan diferentes historias termomec\u00e1nicas (por ejemplo, diferentes velocidades de enfriamiento y presiones de empaquetamiento) a medida que el material se solidifica desde la pared del molde hacia el centro.<\/li>\n<li>Los cambios de presi\u00f3n, temperatura y orientaci\u00f3n molecular y de las fibras dan lugar a propiedades mec\u00e1nicas y de densidad variables.<\/li>\n<li>Ciertas restricciones del molde impiden que la pieza moldeada se encoja en las direcciones planas.<\/li>\n<\/ul>\n<h2>Ejemplo de enfriamiento libre<\/h2>\n<p>La contracci\u00f3n del material durante el moldeo por inyecci\u00f3n puede demostrarse convenientemente con un ejemplo de enfriamiento libre, en el que una pieza de temperatura uniforme se intercala repentinamente entre las paredes fr\u00edas del molde. Durante las primeras fases de enfriamiento, cuando las capas superficiales externas se enfr\u00edan y empiezan a contraerse, la mayor parte del pol\u00edmero del n\u00facleo caliente sigue fundido y puede contraerse. Sin embargo, a medida que el n\u00facleo interno se enfr\u00eda, la contracci\u00f3n t\u00e9rmica local se ve limitada por las capas externas ya r\u00edgidas. Esto da lugar a un estado t\u00edpico de distribuci\u00f3n de tensiones con tensi\u00f3n en el n\u00facleo equilibrada por la compresi\u00f3n en las capas externas, como se ilustra en la figura 2.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1304\" title=\"Free-quenching-example\" src=\"https:\/\/web.archive.org\/web\/20130131102842im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Free-quenching-example.gif\" alt=\"Free-quenching-example\" width=\"579\" height=\"258\" \/><\/p>\n<p><strong>FIGURA 2.<\/strong>\u00a0El desarrollo de tensiones t\u00e9rmicas residuales en una pieza de \"enfriamiento libre\" debido a variaciones en el enfriamiento a trav\u00e9s de la pieza moldeada y la respuesta del material a la historia de la temperatura.<\/p>","protected":false},"excerpt":{"rendered":"<p>La tensi\u00f3n residual es una tensi\u00f3n inducida por el proceso, congelada en una pieza moldeada. Puede ser inducida por el flujo o inducida t\u00e9rmicamente. Las tensiones residuales afectan a una pieza de forma similar a las tensiones aplicadas externamente. Si son lo suficientemente fuertes como para superar la integridad estructural de la pieza, \u00e9sta se deformar\u00e1 en el momento de la expulsi\u00f3n, o m\u00e1s tarde [...].<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[15],"tags":[],"class_list":["post-603","post","type-post","status-publish","format-standard","hentry","category-mould-technology-blog-1"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Chapter 25-1, Residual stress - Plastic Mold | China Mold Maker<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.plasticmoldco.com\/es\/2018\/10\/17\/kapitel-25-1-restspanning\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chapter 25-1, Residual stress - Plastic Mold | China Mold Maker\" \/>\n<meta property=\"og:description\" content=\"A culprit in shrinkage and warpage problems Residual stress is a process-induced stress, frozen in a molded part. 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It can be either\u00a0flow-induced or thermal-induced. Residual stresses affect a part similarly to externally applied stresses. 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