{"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\/cs\/2018\/10\/17\/kapitola-25-3-zbytkove-napeti-porcelanove-vstrikovaci-formy\/","title":{"rendered":"Kapitola 25-3, Zbytkov\u00e9 nap\u011bt\u00ed, vst\u0159ikovac\u00ed forma z porcel\u00e1nu"},"content":{"rendered":"<div id=\"titlep\">\n<div>\n<div>Kapitola 25-3, Zbytkov\u00e9 nap\u011bt\u00ed, vst\u0159ikovac\u00ed forma z porcel\u00e1nu<br \/>\n<a href=\"https:\/\/web.archive.org\/web\/20130131102856\/http:\/\/www.moldchina.org\/\">Home<\/a>\u00a0\"\u00a0<a title=\"Zobrazit v\u0161echny p\u0159\u00edsp\u011bvky v blogu Technologie forem\" href=\"https:\/\/web.archive.org\/web\/20130131102856\/http:\/\/www.moldchina.org\/mold-news\/mould-china-blog\" rel=\"category tag\">Blog o technologii forem<\/a>\u00a0\"\u00a0<a title=\"Zobrazit v\u0161echny p\u0159\u00edsp\u011bvky v News Center\" href=\"https:\/\/web.archive.org\/web\/20130131102856\/http:\/\/www.moldchina.org\/mold-news\" rel=\"category tag\">Centrum zpravodajstv\u00ed<\/a>\u00a0\" Kapitola 25-3, Zbytkov\u00e9 nap\u011bt\u00ed, vst\u0159ikovac\u00ed forma z porcel\u00e1nu<\/div>\n<\/div>\n<\/div>\n<div id=\"mge\"><\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1332\" title=\"Diferenci\u00e1ln\u00ed smr\u0161\u0165ov\u00e1n\u00ed\" src=\"https:\/\/web.archive.org\/web\/20130131102856im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Differential-shrinkage.gif\" alt=\"\" width=\"569\" height=\"209\" \/><\/p>\n<h3>OBR\u00c1ZEK 5. Vznikaj\u00ed prom\u011bnn\u00e1 zbytkov\u00e1 nap\u011bt\u00ed a d\u00edl se deformuje, kdy\u017e na sebe vz\u00e1jemn\u011b p\u016fsob\u00ed vrstvy s r\u016fzn\u00fdm m\u011brn\u00fdm objemem zmrazen\u00e9ho materi\u00e1lu.<\/h3>\n<h2>Zbytkov\u00e9 nap\u011bt\u00ed vyvolan\u00e9 procesem vs. zbytkov\u00e9 nap\u011bt\u00ed v dutin\u011b<\/h2>\n<p>\u00dadaje o zbytkov\u00e9m nap\u011bt\u00ed vyvolan\u00e9m procesem jsou pro simulaci tv\u00e1\u0159en\u00ed mnohem u\u017eite\u010dn\u011bj\u0161\u00ed ne\u017e \u00fadaje o zbytkov\u00e9m nap\u011bt\u00ed v dutin\u011b. N\u00e1sleduj\u00ed definice t\u011bchto dvou pojm\u016f spolu s p\u0159\u00edkladem, kter\u00fd ilustruje rozd\u00edl mezi nimi.<\/p>\n<h3>Zbytkov\u00e9 nap\u011bt\u00ed zp\u016fsoben\u00e9 procesem<\/h3>\n<p>Po vyhozen\u00ed d\u00edlu se uvoln\u00ed omezen\u00ed z dutiny formy a d\u00edl se m\u016f\u017ee voln\u011b smr\u0161\u0165ovat a deformovat. Pot\u00e9, co se ust\u00e1l\u00ed do rovnov\u00e1\u017en\u00e9ho stavu, se zb\u00fdvaj\u00edc\u00ed nap\u011bt\u00ed uvnit\u0159 d\u00edlu naz\u00fdv\u00e1 zbytkov\u00e9 nap\u011bt\u00ed vyvolan\u00e9 procesem nebo jednodu\u0161e zbytkov\u00e9 nap\u011bt\u00ed. Procesem indukovan\u00e9 zbytkov\u00e9 nap\u011bt\u00ed m\u016f\u017ee b\u00fdt indukovan\u00e9 proud\u011bn\u00edm nebo teplem, p\u0159i\u010dem\u017e dominantn\u00ed slo\u017ekou je tepeln\u00e9 nap\u011bt\u00ed.<\/p>\n<h3>Zbytkov\u00e9 nap\u011bt\u00ed v dutin\u011b<\/h3>\n<p>Zat\u00edmco je d\u00edl st\u00e1le omezen v dutin\u011b formy, vnit\u0159n\u00ed nap\u011bt\u00ed, kter\u00e9 vznik\u00e1 b\u011bhem tuhnut\u00ed, se ozna\u010duje jako zbytkov\u00e9 nap\u011bt\u00ed v dutin\u011b. Toto zbytkov\u00e9 nap\u011bt\u00ed v dutin\u011b je silou, kter\u00e1 zp\u016fsobuje smr\u0161\u0165ov\u00e1n\u00ed a deformace d\u00edlu po vst\u0159ikov\u00e1n\u00ed.<\/p>\n<h3>P\u0159\u00edklad<\/h3>\n<p>Rozlo\u017een\u00ed smr\u0161t\u011bn\u00ed popsan\u00e9 v kapitole Deformace v d\u016fsledku diferenci\u00e1ln\u00edho smr\u0161t\u011bn\u00ed vede k tepeln\u011b indukovan\u00e9mu profilu zbytkov\u00e9ho nap\u011bt\u00ed pro vysunut\u00fd d\u00edl, jak je zn\u00e1zorn\u011bno na obr\u00e1zku vlevo dole. Profil nap\u011bt\u00ed na lev\u00e9m horn\u00edm obr\u00e1zku je zbytkov\u00e9 nap\u011bt\u00ed v dutin\u011b, kdy v\u00fdlisek z\u016fst\u00e1v\u00e1 p\u0159ed vyhozen\u00edm omezen ve form\u011b. Po vyhozen\u00ed d\u00edlu a uvoln\u011bn\u00ed omezuj\u00edc\u00ed s\u00edly z formy se d\u00edl smr\u0161t\u00ed a deformuje, aby se uvolnilo zabudovan\u00e9 zbytkov\u00e9 nap\u011bt\u00ed (obecn\u011b tahov\u00e9 nap\u011bt\u00ed, jak je zn\u00e1zorn\u011bno) a dos\u00e1hlo rovnov\u00e1\u017en\u00e9ho stavu. Rovnov\u00e1\u017en\u00fd stav znamen\u00e1, \u017ee na d\u00edl nep\u016fsob\u00ed \u017e\u00e1dn\u00e1 vn\u011bj\u0161\u00ed s\u00edla a tahov\u00e1 a tlakov\u00e1 nap\u011bt\u00ed v pr\u016f\u0159ezu d\u00edlu by se m\u011bla vz\u00e1jemn\u011b vyrovnat. Obr\u00e1zky na prav\u00e9 stran\u011b odpov\u00eddaj\u00ed p\u0159\u00edpadu, kdy doch\u00e1z\u00ed k nerovnom\u011brn\u00e9mu ochlazov\u00e1n\u00ed po cel\u00e9 tlou\u0161\u0165ce d\u00edlu, a t\u00edm k asymetrick\u00e9mu rozlo\u017een\u00ed zbytkov\u00e9ho nap\u011bt\u00ed.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1333\" title=\"Profil zbytkov\u00e9ho nap\u011bt\u00ed v dutin\u011b (naho\u0159e) vs. profil zbytkov\u00e9ho nap\u011bt\u00ed vyvolan\u00e9ho procesem a tvar d\u00edlu po vysunut\u00ed (dole).\" src=\"https:\/\/web.archive.org\/web\/20130131102856im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/In-cavity-residual-stress-p.gif\" alt=\"Profil zbytkov\u00e9ho nap\u011bt\u00ed v dutin\u011b (naho\u0159e) vs. profil zbytkov\u00e9ho nap\u011bt\u00ed vyvolan\u00e9ho procesem a tvar d\u00edlu po vysunut\u00ed (dole).\" width=\"662\" height=\"512\" \/><\/p>\n<p>OBR\u00c1ZEK 6. Profil zbytkov\u00e9ho nap\u011bt\u00ed v dutin\u011b (naho\u0159e) vs. profil zbytkov\u00e9ho nap\u011bt\u00ed vyvolan\u00e9ho procesem a tvar d\u00edlu po vysunut\u00ed (dole).<\/p>\n<h2>Sn\u00ed\u017een\u00ed zbytkov\u00e9ho nap\u011bt\u00ed zp\u016fsoben\u00e9ho teplem<\/h2>\n<p>Podm\u00ednky, kter\u00e9 vedou k dostate\u010dn\u00e9mu zapln\u011bn\u00ed a rovnom\u011brn\u011bj\u0161\u00ed teplot\u011b st\u011bn formy, sn\u00ed\u017e\u00ed tepeln\u011b indukovan\u00e9 zbytkov\u00e9 nap\u011bt\u00ed. Pat\u0159\u00ed mezi n\u011b:<br \/>\n- Spr\u00e1vn\u00fd tlak a doba trv\u00e1n\u00ed ucp\u00e1vky<br \/>\n- Rovnom\u011brn\u00e9 chlazen\u00ed v\u0161ech povrch\u016f d\u00edlu<br \/>\n- Jednotn\u00e1 tlou\u0161\u0165ka st\u011bny<\/p>","protected":false},"excerpt":{"rendered":"<p>Kapitola 25-3, Zbytkov\u00e9 nap\u011bt\u00ed, porcel\u00e1n vst\u0159ikovac\u00ed formy Dom\u00e1c\u00ed \u00bb Mould Technology Blog \u00bb News Center \u00bb Kapitola 25-3, Zbytkov\u00e9 nap\u011bt\u00ed, porcel\u00e1n vst\u0159ikovac\u00ed formy OBR\u00c1ZEK 5. Prom\u011bnliv\u00e1 zbytkov\u00e1 nap\u011bt\u00ed vznikaj\u00ed a d\u00edl se deformuje p\u0159i vz\u00e1jemn\u00e9 interakci vrstev s r\u016fzn\u00fdm m\u011brn\u00fdm objemem zmrazen\u00e9ho materi\u00e1lu vs. zbytkov\u00e9 nap\u011bt\u00ed v dutin\u011b \u00dadaje o zbytkov\u00e9m nap\u011bt\u00ed vyvolan\u00e9m procesem jsou mnohem u\u017eite\u010dn\u011bj\u0161\u00ed ne\u017e \u00fadaje o zbytkov\u00e9m nap\u011bt\u00ed v dutin\u011b [...].<\/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":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Chapter 25-3, 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