{"id":9321,"date":"2017-03-27T15:46:40","date_gmt":"2017-03-27T13:46:40","guid":{"rendered":"http:\/\/lcm-content.web-email.at\/en\/?post_type=project&#038;p=9321"},"modified":"2018-05-24T10:53:53","modified_gmt":"2018-05-24T08:53:53","slug":"design-of-extrusion-dies-using-network-analysis","status":"publish","type":"project","link":"https:\/\/lcm-content.web-email.at\/en\/project\/design-of-extrusion-dies-using-network-analysis\/","title":{"rendered":"Design of extrusion dies using network analysis"},"content":{"rendered":"<p>The production of plastic parts in a continuous process requires accurate knowledge of the melt distribution inside the die. Common numerical methods give good results, but they require high computational power and complex geometry generation. Using a method analogous to the analysis of electrical networks, a quick analytical examination is possible.<\/p>\n<p>Designing extrusion dies, the flow channel has to be defined in such a way, that the average velocity in the outlet cross-section is constant. In flat dies and side-fed mandrel dies for the production of flat profiles (plates, sheets) or hollow profile (tubes, pipes), respectively, a distribution channel provides a constant melt distribution perpendicular to the extrusion direction.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-9324\" src=\"http:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Law_2en-690x488.png\" alt=\"\" width=\"690\" height=\"488\" srcset=\"https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Law_2en-690x488.png 690w, https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Law_2en-300x212.png 300w, https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Law_2en-768x543.png 768w, https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Law_2en-400x284.png 400w, https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Law_2en-1080x763.png 1080w\" sizes=\"auto, (max-width: 690px) 100vw, 690px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-9323\" src=\"http:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Analogy-to-Kirchhoffs_En-611x1024.png\" alt=\"\" width=\"611\" height=\"1024\" srcset=\"https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Analogy-to-Kirchhoffs_En-611x1024.png 611w, https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Analogy-to-Kirchhoffs_En-179x300.png 179w, https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Analogy-to-Kirchhoffs_En.png 672w\" sizes=\"auto, (max-width: 611px) 100vw, 611px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-9322\" src=\"http:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Law_En-690x488.png\" alt=\"\" width=\"690\" height=\"488\" srcset=\"https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Law_En-690x488.png 690w, https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Law_En-300x212.png 300w, https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Law_En-768x543.png 768w, https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Law_En-400x284.png 400w, https:\/\/lcm-content.web-email.at\/wp-content\/uploads\/2017\/03\/Law_En-1080x763.png 1080w\" sizes=\"auto, (max-width: 690px) 100vw, 690px\" \/><\/p>\n<p style=\"text-align: justify;\">3D-Str\u00f6mungsberechnungen, die auf numerischen Diskretisierungverfahren wie der Finite-Elemente-Methode (FEM) oder der Finite-Volumen-Methode (FVM) beruhen, erm\u00f6glichen eine Bestimmung der zu erwartenden Schmelzeverteilung. Diese Methoden versuchen komplexe physikalische Gleichungen numerisch zu l\u00f6sen. Dazu m\u00fcssen jedoch detaillierte Kenntnisse \u00fcber die Werkzeuggeometrie vorhanden sein, die zu einem fr\u00fchen Entwurfszeitpunkt in dieser Form noch nicht vorliegen. Ein weiterer Nachteil rein numerischer Ans\u00e4tze sind die immer noch relativ langen Rechenzeiten, welche die im Vorentwurf geforderten zahlreichen Variantenberechnungen in einen zeitlich nicht mehr vertretbaren Rahmen zwingen.<\/p>\n<p style=\"text-align: justify;\">Eine aussichtsreiche Alternative stellen analytische Zusammenh\u00e4ngen und Berechnungsverfahren dar. Dazu wird das Extrusionswerkzeug in mehrere Segmente unterteilt. Wie in Abbildung 1 dargestellt, besteht jedes Segment aus einem Verteilerkanalabschnitt und dem zugeh\u00f6rigen Drosselfeld. Die Kopplung der Str\u00f6mungen in Verteilerkanal und Drosselfeld erfolgt \u00fcber Dr\u00fccke und Volumenstr\u00f6me.<\/p>\n<p style=\"text-align: justify;\">Zur Berechnung des Druck-Durchsatzverhaltens in den einzelnen Segmenten sind exakte, analytische Zusammenh\u00e4nge vorhanden. Das dabei entstehende Netzwerk aus Flie\u00dfwiderst\u00e4nden kann analog zur Analyse elektrischer Netzwerke, die aus ohmschen Widerst\u00e4nden aufgebaut sind, gel\u00f6st werden. Hierzu werden folgende Analogien definiert:<\/p>\n<ul>\n<li>Spannung U &#x2194; Druckabfall Dp<\/li>\n<li>Stromst\u00e4rke I &#x2194; Volumenstrom<\/li>\n<li>Ohmscher Widerstand W &#x2194; Flie\u00dfwiderstand C f\u00fcr geometrisch einfaches Segment<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Anschlie\u00dfend wird mit Hilfe der systematischen Netzwerkanalyse ein lineares Gleichungssystem aufgestellt und gel\u00f6st. Die Laufzeit auf einem Standardrechner betr\u00e4gt dabei einige Sekunden, w\u00e4hrend bei herk\u00f6mmlichen, numerischen Verfahren ein Rechenaufwand im Bereich einiger Stunden n\u00f6tig ist.<\/p>\n<p style=\"text-align: justify;\">Der Einsatz der Netzwerkanalyse zur Auslegung von Extrusionswerkzeugen in der Kunststoffverarbeitung stellt eine Alternative zu zeit- und rechenintensiven 3D-FEM\/FVM-Berechnungen dar. Es ist eine schnelle, qualitative Absch\u00e4tzung der Schmelzeverteilung im Werkzeug bei Materialwechsel oder Betriebspunkt\u00e4nderung m\u00f6glich. Die Methode ist in ihrer Anwendung nicht auf Extrusionswerkzeuge beschr\u00e4nkt, sondern kann auch auf weitere Anlagenkomponenten (statische Mischer, Barriereschnecken, Schmelzepumpen) \u00fcbertragen werden, in den Str\u00f6mungen und Druckverlustberechnungen bei der Auslegung ber\u00fccksichtigt werden m\u00fcssen.<\/p>\n<div class=\"shariff shariff-align-flex-start shariff-widget-align-flex-start\"><div class=\"ShariffHeadline\">Share this information<\/div><ul class=\"shariff-buttons theme-round orientation-horizontal buttonsize-medium\"><li class=\"shariff-button facebook shariff-nocustomcolor\" style=\"background-color:#4273c8\"><a href=\"https:\/\/www.facebook.com\/sharer\/sharer.php?u=https%3A%2F%2Flcm-content.web-email.at%2Fen%2Fproject%2Fdesign-of-extrusion-dies-using-network-analysis%2F\" title=\"Share on Facebook\" aria-label=\"Share on Facebook\" role=\"button\" rel=\"nofollow\" class=\"shariff-link\" style=\"; background-color:#3b5998; color:#fff\" target=\"_blank\"><span class=\"shariff-icon\" style=\"\"><svg width=\"32px\" height=\"20px\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 18 32\"><path fill=\"#3b5998\" d=\"M17.1 0.2v4.7h-2.8q-1.5 0-2.1 0.6t-0.5 1.9v3.4h5.2l-0.7 5.3h-4.5v13.6h-5.5v-13.6h-4.5v-5.3h4.5v-3.9q0-3.3 1.9-5.2t5-1.8q2.6 0 4.1 0.2z\"\/><\/svg><\/span><\/a><\/li><li class=\"shariff-button linkedin shariff-nocustomcolor\" style=\"background-color:#1488bf\"><a href=\"https:\/\/www.linkedin.com\/sharing\/share-offsite\/?url=https%3A%2F%2Flcm-content.web-email.at%2Fen%2Fproject%2Fdesign-of-extrusion-dies-using-network-analysis%2F\" title=\"Share on LinkedIn\" aria-label=\"Share on LinkedIn\" role=\"button\" rel=\"noopener nofollow\" class=\"shariff-link\" style=\"; background-color:#0077b5; color:#fff\" target=\"_blank\"><span class=\"shariff-icon\" style=\"\"><svg width=\"32px\" height=\"20px\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 27 32\"><path fill=\"#0077b5\" d=\"M6.2 11.2v17.7h-5.9v-17.7h5.9zM6.6 5.7q0 1.3-0.9 2.2t-2.4 0.9h0q-1.5 0-2.4-0.9t-0.9-2.2 0.9-2.2 2.4-0.9 2.4 0.9 0.9 2.2zM27.4 18.7v10.1h-5.9v-9.5q0-1.9-0.7-2.9t-2.3-1.1q-1.1 0-1.9 0.6t-1.2 1.5q-0.2 0.5-0.2 1.4v9.9h-5.9q0-7.1 0-11.6t0-5.3l0-0.9h5.9v2.6h0q0.4-0.6 0.7-1t1-0.9 1.6-0.8 2-0.3q3 0 4.9 2t1.9 6z\"\/><\/svg><\/span><\/a><\/li><li class=\"shariff-button xing shariff-nocustomcolor\" style=\"background-color:#29888a\"><a href=\"https:\/\/www.xing.com\/spi\/shares\/new?url=https%3A%2F%2Flcm-content.web-email.at%2Fen%2Fproject%2Fdesign-of-extrusion-dies-using-network-analysis%2F\" title=\"Share on XING\" aria-label=\"Share on XING\" role=\"button\" rel=\"noopener nofollow\" class=\"shariff-link\" style=\"; background-color:#126567; color:#fff\" target=\"_blank\"><span class=\"shariff-icon\" style=\"\"><svg width=\"32px\" height=\"20px\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 25 32\"><path fill=\"#126567\" d=\"M10.7 11.9q-0.2 0.3-4.6 8.2-0.5 0.8-1.2 0.8h-4.3q-0.4 0-0.5-0.3t0-0.6l4.5-8q0 0 0 0l-2.9-5q-0.2-0.4 0-0.7 0.2-0.3 0.5-0.3h4.3q0.7 0 1.2 0.8zM25.1 0.4q0.2 0.3 0 0.7l-9.4 16.7 6 11q0.2 0.4 0 0.6-0.2 0.3-0.6 0.3h-4.3q-0.7 0-1.2-0.8l-6-11.1q0.3-0.6 9.5-16.8 0.4-0.8 1.2-0.8h4.3q0.4 0 0.5 0.3z\"\/><\/svg><\/span><\/a><\/li><li class=\"shariff-button mailto shariff-nocustomcolor\" style=\"background-color:#a8a8a8\"><a href=\"mailto:?body=https%3A%2F%2Flcm-content.web-email.at%2Fen%2Fproject%2Fdesign-of-extrusion-dies-using-network-analysis%2F&subject=Design%20of%20extrusion%20dies%20using%20network%20analysis\" title=\"Send by email\" aria-label=\"Send by email\" role=\"button\" rel=\"noopener nofollow\" class=\"shariff-link\" style=\"; background-color:#999; color:#fff\"><span class=\"shariff-icon\" style=\"\"><svg width=\"32px\" height=\"20px\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 32 32\"><path fill=\"#999\" d=\"M32 12.7v14.2q0 1.2-0.8 2t-2 0.9h-26.3q-1.2 0-2-0.9t-0.8-2v-14.2q0.8 0.9 1.8 1.6 6.5 4.4 8.9 6.1 1 0.8 1.6 1.2t1.7 0.9 2 0.4h0.1q0.9 0 2-0.4t1.7-0.9 1.6-1.2q3-2.2 8.9-6.1 1-0.7 1.8-1.6zM32 7.4q0 1.4-0.9 2.7t-2.2 2.2q-6.7 4.7-8.4 5.8-0.2 0.1-0.7 0.5t-1 0.7-0.9 0.6-1.1 0.5-0.9 0.2h-0.1q-0.4 0-0.9-0.2t-1.1-0.5-0.9-0.6-1-0.7-0.7-0.5q-1.6-1.1-4.7-3.2t-3.6-2.6q-1.1-0.7-2.1-2t-1-2.5q0-1.4 0.7-2.3t2.1-0.9h26.3q1.2 0 2 0.8t0.9 2z\"\/><\/svg><\/span><\/a><\/li><\/ul><\/div>","protected":false},"excerpt":{"rendered":"<p>The production of plastic parts in a continuous process requires accurate knowledge of the melt distribution inside the die. Common numerical methods give good results, but they require high computational [&hellip;]<\/p>\n","protected":false},"author":20,"featured_media":9324,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"project_category":[205,265],"project_tag":[],"class_list":["post-9321","project","type-project","status-publish","has-post-thumbnail","hentry","project_category-area-1-en","project_category-k2-success-stories"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Design of extrusion dies using network analysis - LCM<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Design of extrusion dies using network analysis - LCM\" \/>\n<meta property=\"og:description\" content=\"The production of plastic parts in a continuous process requires accurate knowledge of the melt distribution inside the die. 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