{"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\/fi\/2018\/10\/17\/luku-25-1-jaannosjannitys\/","title":{"rendered":"25-1 luku, J\u00e4\u00e4nn\u00f6sj\u00e4nnitys"},"content":{"rendered":"<h1>Syyllinen kutistumis- ja v\u00e4\u00e4ntymisongelmiin.<\/h1>\n<p>J\u00e4\u00e4nn\u00f6sj\u00e4nnitys on prosessin aiheuttama j\u00e4nnitys, joka on j\u00e4hmettynyt valettuun kappaleeseen. Se voi olla joko virtauksen tai l\u00e4mm\u00f6n aiheuttama. J\u00e4\u00e4nn\u00f6sj\u00e4nnitykset vaikuttavat kappaleeseen samalla tavalla kuin ulkoisesti kohdistuvat j\u00e4nnitykset. Jos ne ovat tarpeeksi voimakkaita voittaakseen osan rakenteellisen eheyden, osa v\u00e4\u00e4ntyy ulosheitt\u00e4misen yhteydess\u00e4 tai my\u00f6hemmin murtuu, kun ulkoinen k\u00e4ytt\u00f6kuorma kohdistuu. J\u00e4\u00e4nn\u00f6sj\u00e4nnitykset ovat t\u00e4rkein syy osan kutistumiseen ja v\u00e4\u00e4ntymiseen. Prosessiolosuhteet ja suunnitteluelementit, jotka v\u00e4hent\u00e4v\u00e4t leikkausj\u00e4nnityst\u00e4 ontelon t\u00e4yt\u00f6n aikana, auttavat v\u00e4hent\u00e4m\u00e4\u00e4n virtauksen aiheuttamia j\u00e4\u00e4nn\u00f6sj\u00e4nnityksi\u00e4. Samoin ne, jotka edist\u00e4v\u00e4t riitt\u00e4v\u00e4\u00e4 pakkautumista ja muotin tasaista j\u00e4\u00e4hdytyst\u00e4, v\u00e4hent\u00e4v\u00e4t l\u00e4mp\u00f6per\u00e4ist\u00e4 j\u00e4\u00e4nn\u00f6sj\u00e4nnityst\u00e4. Kuitut\u00e4ytteisten materiaalien osalta tasaisia mekaanisia ominaisuuksia edist\u00e4v\u00e4t prosessiolosuhteet v\u00e4hent\u00e4v\u00e4t l\u00e4mp\u00f6j\u00e4\u00e4nn\u00f6sj\u00e4nnityst\u00e4.\u00a0<a title=\"Kiina muotti toimittaja\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Kiina muotti toimittaja<\/a><\/p>\n<h1>Virtauksen aiheuttama j\u00e4\u00e4nn\u00f6sj\u00e4nnitys<\/h1>\n<p>J\u00e4nnitt\u00e4m\u00e4tt\u00f6m\u00e4t, pitk\u00e4ketjuiset polymeerimolekyylit pyrkiv\u00e4t sulan l\u00e4mp\u00f6tilaa korkeammissa l\u00e4mp\u00f6tiloissa (eli sulassa tilassa) mukautumaan satunnaiskierteiseen tasapainotilaan. K\u00e4sittelyn aikana molekyylit suuntautuvat virtaussuuntaan, kun polymeeri leikkautuu ja venyy. Jos j\u00e4hmettyminen tapahtuu ennen kuin polymeerimolekyylit ovat t\u00e4ysin relaksoituneet tasapainotilaansa, molekyylien suuntautuminen lukittuu<br \/>\nvalettu osa. T\u00e4llaista j\u00e4\u00e4tynytt\u00e4 j\u00e4nnitystilaa kutsutaan usein virtauksen aiheuttamaksi j\u00e4\u00e4nn\u00f6sj\u00e4nnitykseksi. Koska molekyylien suunta on venytetty virtaussuunnassa, se aiheuttaa anisotrooppista, ep\u00e4yhten\u00e4ist\u00e4 kutistumaa ja mekaanisia ominaisuuksia virtaussuunnan suuntaisesti ja kohtisuoraan virtaussuuntaan n\u00e4hden.<\/p>\n<h2>Molekyylien orientaatio j\u00e4\u00e4dytettyn\u00e4<\/h2>\n<p>Suuren leikkausj\u00e4nnityksen ja suuren j\u00e4\u00e4hdytysnopeuden yhdistelm\u00e4n vuoksi muotin sein\u00e4m\u00e4n vieress\u00e4 on eritt\u00e4in suuntautunut kerros, joka j\u00e4\u00e4tyy v\u00e4litt\u00f6m\u00e4sti kappaleen pinnan alle. T\u00e4m\u00e4 on esitetty kuvassa 1. Jos korkeat j\u00e4\u00e4nn\u00f6svirtausj\u00e4nnitykset (tai j\u00e4\u00e4tynyt orientaatio) omaava kappale altistetaan my\u00f6hemmin korkealle l\u00e4mp\u00f6tilalle, osa j\u00e4nnityksist\u00e4 voi purkautua. T\u00e4m\u00e4 johtaa tyypillisesti osan kutistumiseen ja v\u00e4\u00e4ntymiseen. J\u00e4\u00e4tyneiden kerrosten l\u00e4mp\u00f6erist\u00e4v\u00e4n vaikutuksen vuoksi kuumassa ytimess\u00e4 oleva polymeerisula voi rentoutua enemm\u00e4n, mik\u00e4 johtaa matalan molekyyliorientaation vy\u00f6hykkeeseen.\u00a0<a title=\"Kiina muotti toimittaja\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Kiina muotti toimittaja<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1303\" title=\"Frozen-in-molecular-orienta\" src=\"https:\/\/web.archive.org\/web\/20130131102842im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Frozen-in-molecular-orienta.gif\" alt=\"Frozen-in-molecular-orienta\" width=\"579\" height=\"258\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>KUVA 1.<\/strong>\u00a0J\u00e4\u00e4nn\u00f6svirtausj\u00e4nnitysten kehittyminen, joka johtuu j\u00e4\u00e4tyneest\u00e4 molekyylien suuntautumisesta t\u00e4ytt\u00f6- ja pakkausvaiheessa.<br \/>\n(1) Korkean j\u00e4\u00e4hdytyksen, leikkauksen ja suuntautumisen vy\u00f6hyke (2) Matalan j\u00e4\u00e4hdytyksen, leikkauksen ja suuntautumisen vy\u00f6hyke<\/p>\n<h2>Virtauksen aiheuttaman j\u00e4\u00e4nn\u00f6sj\u00e4nnityksen v\u00e4hent\u00e4minen<\/h2>\n<p>Prosessiolosuhteet, jotka v\u00e4hent\u00e4v\u00e4t sulan leikkausj\u00e4nnityst\u00e4, v\u00e4hent\u00e4v\u00e4t virtauksen aiheuttamia j\u00e4\u00e4nn\u00f6sj\u00e4nnityksi\u00e4. Yleens\u00e4 virtauksen aiheuttama j\u00e4\u00e4nn\u00f6sj\u00e4nnitys on kertaluokkaa pienempi kuin l\u00e4mp\u00f6j\u00e4nnitys.\u00a0<a title=\"Kiina muotti toimittaja\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Kiina muotti toimittaja<\/a><\/p>\n<ul>\n<li>korkeampi sulamisl\u00e4mp\u00f6tila<\/li>\n<li>korkeampi muottisein\u00e4n l\u00e4mp\u00f6tila<\/li>\n<li>pidempi t\u00e4ytt\u00f6aika (alhaisempi sulamisnopeus)<\/li>\n<li>v\u00e4hentynyt pakkauksen paine<\/li>\n<li>lyhyempi virtausreitti.<\/li>\n<\/ul>\n<h1>\u00a0L\u00e4mp\u00f6tilan aiheuttama j\u00e4\u00e4nn\u00f6sj\u00e4nnitys<\/h1>\n<p>L\u00e4mp\u00f6tilan aiheuttama j\u00e4\u00e4nn\u00f6sj\u00e4nnitys johtuu seuraavista syist\u00e4:<\/p>\n<ul>\n<li>Materiaali kutistuu, kun l\u00e4mp\u00f6tila laskee prosessiasetuksista ymp\u00e4rist\u00f6n olosuhteisiin, jotka saavutetaan prosessin p\u00e4\u00e4tytty\u00e4.<\/li>\n<li>Materiaalielementit kokevat erilaisen l\u00e4mp\u00f6mekaanisen historian (esim. erilaiset j\u00e4\u00e4hdytysnopeudet ja pakkauspaineet), kun materiaali j\u00e4hmettyy muotin sein\u00e4m\u00e4st\u00e4 keskelle.<\/li>\n<li>Paineen, l\u00e4mp\u00f6tilan sek\u00e4 molekyylien ja kuitujen suuntautumisen muuttuminen johtaa vaihtelevaan tiheyteen ja mekaanisiin ominaisuuksiin.<\/li>\n<li>Tietyt muotin rajoitukset est\u00e4v\u00e4t muottiin valetun kappaleen kutistumisen tasosuunnissa.<\/li>\n<\/ul>\n<h2>Esimerkki vapaasta sammutuksesta<\/h2>\n<p>Materiaalin kutistuminen ruiskuvalun aikana voidaan havainnollistaa k\u00e4tev\u00e4sti esimerkill\u00e4 vapaasta sammutuksesta, jossa tasal\u00e4mp\u00f6inen kappale on yht\u00e4kki\u00e4 kylmien muotin sein\u00e4mien v\u00e4liss\u00e4. J\u00e4\u00e4hdytyksen alkuvaiheessa, kun ulkoiset pintakerrokset j\u00e4\u00e4htyv\u00e4t ja alkavat kutistua, suurin osa polymeerist\u00e4 kuumassa ytimess\u00e4 on edelleen sulaa ja voi vapaasti supistua. Sis\u00e4isen ytimen j\u00e4\u00e4htyess\u00e4 paikallista l\u00e4mp\u00f6supistumista rajoittavat kuitenkin jo valmiiksi j\u00e4yk\u00e4t ulkoiset kerrokset. T\u00e4m\u00e4 johtaa tyypilliseen j\u00e4nnitysjakauman tilaan, jossa j\u00e4nnitys ytimess\u00e4 on tasapainossa ulkokerrosten puristumisen kanssa, kuten alla olevassa kuvassa 2 on esitetty.<\/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>KUVIO 2.<\/strong>\u00a0J\u00e4\u00e4nn\u00f6sl\u00e4mp\u00f6j\u00e4nnityksen kehittyminen vapaasti sammuvassa kappaleessa, joka johtuu j\u00e4\u00e4hdytyksen vaihteluista koko muottiin valetussa kappaleessa ja materiaalin reaktiosta l\u00e4mp\u00f6tilahistoriaan.<\/p>","protected":false},"excerpt":{"rendered":"<p>Syyllinen kutistumis- ja v\u00e4\u00e4ntymisongelmiin J\u00e4\u00e4nn\u00f6sj\u00e4nnitys on prosessin aiheuttama j\u00e4nnitys, joka j\u00e4\u00e4tyy muottiin valettuun kappaleeseen. Se voi olla joko virtauksen tai l\u00e4mm\u00f6n aiheuttama. J\u00e4\u00e4nn\u00f6sj\u00e4nnitykset vaikuttavat kappaleeseen samalla tavalla kuin ulkoisesti kohdistuvat j\u00e4nnitykset. Jos ne ovat tarpeeksi voimakkaita voittaakseen osan rakenteellisen eheyden, osa v\u00e4\u00e4ntyy ulosheitt\u00e4misen yhteydess\u00e4 tai my\u00f6hemmin [...].<\/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\/fi\/2018\/10\/17\/kapitel-25-1-restspanning\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\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. It can be either\u00a0flow-induced or thermal-induced. Residual stresses affect a part similarly to externally applied stresses. 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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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