{"id":599,"date":"2018-10-17T00:13:07","date_gmt":"2018-10-16T16:13:07","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=599"},"modified":"2018-10-17T00:13:07","modified_gmt":"2018-10-16T16:13:07","slug":"chapter-25-3-residual-stress-china-injection-mold","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/de\/2018\/10\/17\/kapitel-25-3-eigenspannung-porzellan-spritzgussform\/","title":{"rendered":"Kapitel 25-3, Eigenspannung, Porzellan-Spritzgussform"},"content":{"rendered":"
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Kapitel 25-3, Eigenspannung, Porzellan-Spritzgussform
\nStartseite<\/a>\u00a0\"\u00a0Werkzeugtechnik-Blog<\/a>\u00a0\"\u00a0Nachrichtenzentrum<\/a>\u00a0\" Kapitel 25-3, Eigenspannung, Porzellan-Spritzgussform<\/div>\n<\/div>\n<\/div>\n
<\/div>\n

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ABBILDUNG 5. Unterschiedliche Eigenspannungen entstehen und das Teil verformt sich, wenn Schichten mit unterschiedlichem spezifischem Volumen miteinander interagieren<\/h3>\n

Prozessbedingte Eigenspannung vs. Eigenspannung im Hohlraum<\/h2>\n

Prozessinduzierte Eigenspannungsdaten sind f\u00fcr die Formsimulation wesentlich n\u00fctzlicher als Eigenspannungsdaten in der Kavit\u00e4t. Im Folgenden finden Sie Definitionen der beiden Begriffe sowie ein Beispiel, das den Unterschied zwischen ihnen verdeutlicht.<\/p>\n

Prozessinduzierte Eigenspannung<\/h3>\n

Nach dem Auswerfen des Teils werden die Zw\u00e4nge des Formhohlraums aufgehoben, und das Teil kann sich frei schrumpfen und verformen. Nachdem sich ein Gleichgewichtszustand eingestellt hat, wird die verbleibende Spannung im Inneren des Teils als prozessinduzierte Eigenspannung oder einfach als Eigenspannung bezeichnet. Prozessinduzierte Eigenspannungen k\u00f6nnen flie\u00dfbedingt oder thermisch bedingt sein, wobei letztere die dominierende Komponente darstellen.<\/p>\n

Eigenspannung im Hohlraum<\/h3>\n

W\u00e4hrend das Teil noch im Formhohlraum eingespannt ist, wird die Eigenspannung, die sich w\u00e4hrend der Erstarrung aufbaut, als Eigenspannung im Formhohlraum bezeichnet. Diese Eigenspannung im Formhohlraum ist die Kraft, die die Schrumpfung und den Verzug des Teils nach dem Auswerfen verursacht.<\/p>\n

Beispiel<\/h3>\n

Die unter Verzug aufgrund von Schwindungsdifferenzen beschriebene Schwindungsverteilung f\u00fchrt zu einem thermisch bedingten Eigenspannungsprofil f\u00fcr ein ausgeworfenes Teil, wie in der Abbildung unten links dargestellt. Das Spannungsprofil in der oberen linken Abbildung ist die Eigenspannung in der Kavit\u00e4t, bei der das Formteil vor dem Auswerfen im Werkzeug eingespannt bleibt. Sobald das Teil ausgeworfen und die Zwangskraft aus der Form freigesetzt wird, schrumpft und verformt sich das Teil, um die eingebaute Eigenspannung (im Allgemeinen Zugspannung, wie dargestellt) abzubauen und einen Gleichgewichtszustand zu erreichen. Der Gleichgewichtszustand bedeutet, dass keine \u00e4u\u00dfere Kraft auf das Teil einwirkt und dass sich die Zug- und Druckspannungen \u00fcber den Teilquerschnitt die Waage halten sollten. Die Abbildungen auf der rechten Seite entsprechen dem Fall einer ungleichm\u00e4\u00dfigen Abk\u00fchlung \u00fcber die Bauteildicke und damit einer asymmetrischen Eigenspannungsverteilung.<\/p>\n

\"Eigenspannungsprofil<\/p>\n

ABBILDUNG 6: Eigenspannungsprofil im Hohlraum (oben) im Vergleich zum prozessinduzierten Eigenspannungsprofil und der Form des Teils nach dem Auswerfen (unten).<\/p>\n

Reduzierung der thermisch bedingten Eigenspannung<\/h2>\n

Bedingungen, die zu einer ausreichenden Packung und gleichm\u00e4\u00dfigeren Formwandtemperaturen f\u00fchren, verringern die thermisch bedingten Eigenspannungen. Dazu geh\u00f6ren:
\n- Richtiger Packungsdruck und Dauer
\n- Gleichm\u00e4\u00dfige K\u00fchlung aller Oberfl\u00e4chen des Werkst\u00fccks
\n- Einheitliche Wandst\u00e4rke<\/p>","protected":false},"excerpt":{"rendered":"

Kapitel 25-3, Eigenspannungen, Porzellan-Spritzgussform Home \" Mould Technology Blog \" News Center \" Kapitel 25-3, Eigenspannungen, Porzellan-Spritzgussform ABBILDUNG 5. Variable Eigenspannungen entstehen und das Teil verformt sich, wenn Schichten mit unterschiedlichem spezifischem Volumen miteinander interagieren Prozessinduzierte vs. kavit\u00e4tsinterne Eigenspannungen Prozessinduzierte Eigenspannungsdaten sind viel n\u00fctzlicher als kavit\u00e4tsinterne Eigenspannungen [...]<\/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-599","post","type-post","status-publish","format-standard","hentry","category-mould-technology-blog-1"],"yoast_head":"\nChapter 25-3, Residual stress, china injection mold - 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\/de\/2018\/10\/17\/\u03ba\u03b5\u03c6\u03ac\u03bb\u03b1\u03b9\u03bf-25-3-\u03c5\u03c0\u03bf\u03bb\u03b5\u03b9\u03bc\u03bc\u03b1\u03c4\u03b9\u03ba\u03ad\u03c2-\u03c4\u03ac\u03c3\u03b5\u03b9\u03c2-\u03c3\u03b5-\u03ba\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chapter 25-3, Residual stress, china injection mold - 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