{"id":600,"date":"2018-10-17T00:14:39","date_gmt":"2018-10-16T16:14:39","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=600"},"modified":"2018-10-17T00:14:39","modified_gmt":"2018-10-16T16:14:39","slug":"chapter-25-2-residual-stress-china-injection-mold","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/pl\/2018\/10\/17\/rozdzial-25-2-naprezenia-szczatkowe-w-porcelanowych-formach-wtryskowych\/","title":{"rendered":"Rozdzia\u0142 25-2, Napr\u0119\u017cenie szcz\u0105tkowe, porcelanowa forma wtryskowa"},"content":{"rendered":"<h1>Niezr\u00f3wnowa\u017cone ch\u0142odzenie<\/h1>\n<p>od \u015bciany formy do jej \u015brodka mo\u017ce powodowa\u0107 napr\u0119\u017cenia szcz\u0105tkowe indukowane termicznie. Co wi\u0119cej, asymetryczne napr\u0119\u017cenia szcz\u0105tkowe indukowane termicznie mog\u0105 wyst\u0105pi\u0107, je\u015bli szybko\u015b\u0107 ch\u0142odzenia dw\u00f3ch powierzchni jest niezr\u00f3wnowa\u017cona. Takie niezr\u00f3wnowa\u017cone ch\u0142odzenie spowoduje asymetryczny wz\u00f3r rozci\u0105gania i \u015bciskania w ca\u0142ej cz\u0119\u015bci, powoduj\u0105c moment zginaj\u0105cy, kt\u00f3ry ma tendencj\u0119 do powodowania wypaczania cz\u0119\u015bci. Zosta\u0142o to zilustrowane na rysunku 3 poni\u017cej. W zwi\u0105zku z tym cz\u0119\u015bci o nier\u00f3wnomiernej grubo\u015bci lub s\u0142abo ch\u0142odzonych obszarach s\u0105 podatne na niezr\u00f3wnowa\u017cone ch\u0142odzenie, a tym samym na szcz\u0105tkowe napr\u0119\u017cenia termiczne. W przypadku umiarkowanie z\u0142o\u017conych cz\u0119\u015bci, rozk\u0142ad napr\u0119\u017ce\u0144 szcz\u0105tkowych wywo\u0142anych temperatur\u0105 jest dodatkowo komplikowany przez nier\u00f3wnomiern\u0105 grubo\u015b\u0107 \u015bcianki, ch\u0142odzenie formy i ograniczenia formy do swobodnego kurczenia si\u0119.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1328\" title=\"Niezr\u00f3wnowa\u017cone ch\u0142odzenie\" src=\"https:\/\/web.archive.org\/web\/20130131102852im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Unbalanced-cooling.gif\" alt=\"\" width=\"584\" height=\"287\" \/><\/p>\n<h3>RYSUNEK 3. Asymetryczne napr\u0119\u017cenia szcz\u0105tkowe indukowane termicznie spowodowane niezr\u00f3wnowa\u017conym ch\u0142odzeniem na ca\u0142ej grubo\u015bci wypraski powoduj\u0105 jej wypaczenie.<\/h3>\n<h2>Zmienna g\u0119sto\u015b\u0107 zamro\u017cenia<\/h2>\n<p>Poni\u017cszy rysunek ilustruje zmiany g\u0119sto\u015bci zamro\u017conej spowodowane histori\u0105 ci\u015bnienia upakowania.<\/p>\n<h3>Profil temperatury<\/h3>\n<p>Lewy rysunek przedstawia profil temperatury w jednym miejscu na cz\u0119\u015bci. Dla cel\u00f3w ilustracji, cz\u0119\u015b\u0107 jest podzielona na osiem r\u00f3wnych warstw na ca\u0142ej grubo\u015bci cz\u0119\u015bci. Profil pokazuje temperatur\u0119 w momencie krzepni\u0119cia (zamarzania) dla ka\u017cdej warstwy (od t1 do t8). Nale\u017cy zauwa\u017cy\u0107, \u017ce materia\u0142 zaczyna krzepn\u0105\u0107 od zewn\u0119trznych warstw, a zamro\u017cony interfejs przesuwa si\u0119 do wewn\u0105trz wraz z up\u0142ywem czasu.<\/p>\n<h3>\u015alad ci\u015bnienia<\/h3>\n<p>\u015arodkowy rysunek przedstawia typow\u0105 histori\u0119 ci\u015bnienia, pokazuj\u0105c poziomy ci\u015bnienia (od P1 do P8) podczas krzepni\u0119cia ka\u017cdej warstwy. Og\u00f3lnie rzecz bior\u0105c, ci\u015bnienie stopniowo wzrasta podczas nape\u0142niania, osi\u0105gaj\u0105c maksimum na wczesnym etapie pakowania, a nast\u0119pnie zaczyna spada\u0107 z powodu ch\u0142odzenia i zamarzania bramy. W zwi\u0105zku z tym materia\u0142 w warstwach zewn\u0119trznych i \u015brodkowych zestala si\u0119, gdy poziom ci\u015bnienia jest niski, podczas gdy warstwy po\u015brednie zamarzaj\u0105 pod wysokim ci\u015bnieniem upakowania.<\/p>\n<h3>Obj\u0119to\u015b\u0107 w\u0142a\u015bciwa po zamro\u017ceniu<\/h3>\n<p>Prawa ilustracja przedstawia \u015blad obj\u0119to\u015bci w\u0142a\u015bciwej dla warstwy 5 na wykresie pvT oraz ostateczne zamro\u017cone obj\u0119to\u015bci w\u0142a\u015bciwe dla wszystkich warstw, oznaczone ponumerowanymi okr\u0119gami.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1329\" title=\"Frozen-in-specific-volume\" src=\"https:\/\/web.archive.org\/web\/20130131102852im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Frozen-in-specific-volume.gif\" alt=\"\" width=\"680\" height=\"251\" \/><\/p>\n<h3>RYSUNEK 4. Czynniki wp\u0142ywaj\u0105ce na rozw\u00f3j \"zamro\u017conej\" obj\u0119to\u015bci w\u0142a\u015bciwej<br \/>\nSkurcz r\u00f3\u017cnicowy<\/h3>\n<p>Bior\u0105c pod uwag\u0119 zamro\u017cone okre\u015blone obj\u0119to\u015bci, r\u00f3\u017cne warstwy b\u0119d\u0105 si\u0119 kurczy\u0107 w r\u00f3\u017cny spos\u00f3b, zgodnie z krzywymi pvT, kt\u00f3re reguluj\u0105 zachowanie skurczu materia\u0142u. Hipotetycznie, gdyby ka\u017cda warstwa zosta\u0142a od\u0142\u0105czona od innych (jak pokazano na rysunku 5), w\u00f3wczas elementy materia\u0142u na lewym rysunku poni\u017cej skurczy\u0142yby si\u0119 jak te na \u015brodkowym rysunku. W tym przypadku warstwy po\u015brednie maj\u0105 tendencj\u0119 do kurczenia si\u0119 mniej ni\u017c inne ze wzgl\u0119du na ni\u017csz\u0105 zamro\u017con\u0105 obj\u0119to\u015b\u0107 w\u0142a\u015bciw\u0105 (lub, r\u00f3wnowa\u017cnie, wy\u017csz\u0105 zamro\u017con\u0105 g\u0119sto\u015b\u0107). W rzeczywisto\u015bci wszystkie warstwy s\u0105 ze sob\u0105 zwi\u0105zane. Dlatego ko\u0144cowym rezultatem b\u0119dzie kompromisowy rozk\u0142ad skurczu, w kt\u00f3rym warstwy po\u015brednie s\u0105 \u015bciskane, a warstwy zewn\u0119trzne i \u015brodkowe s\u0105 rozci\u0105gane.<\/p>","protected":false},"excerpt":{"rendered":"<p>Unbalanced cooling from the mold wall to its center can cause thermal-induced residual stress. Furthermore, asymmetrical thermal-induced residual stress can occur if the cooling rate of the two surfaces is unbalanced. Such unbalanced cooling will result in an asymmetric tension-compression pattern across the part, causing a bending moment that tends to cause part warpage. This [&hellip;]<\/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-600","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 25-2, 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\/pl\/2018\/10\/17\/25-2-fejezet-marado-feszultseg-porcelan-froccsontoforma\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chapter 25-2, Residual stress, china injection mold - Plastic Mold | China Mold Maker\" \/>\n<meta property=\"og:description\" content=\"Unbalanced cooling from the mold wall to its center can cause thermal-induced residual stress. 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Furthermore, asymmetrical thermal-induced residual stress can occur if the cooling rate of the two surfaces is unbalanced. Such unbalanced cooling will result in an asymmetric tension-compression pattern across the part, causing a bending moment that tends to cause part warpage. 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