{"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\/hu\/2018\/10\/17\/25-fejezet-1-marado-feszultseg\/","title":{"rendered":"25-1. \u00e1rucsoport, Marad\u00f3 fesz\u00fclts\u00e9g"},"content":{"rendered":"<h1>A zsugorod\u00e1s \u00e9s a vetemed\u00e9si probl\u00e9m\u00e1k egyik okoz\u00f3ja<\/h1>\n<p>A marad\u00f3 fesz\u00fclts\u00e9g a folyamat \u00e1ltal kiv\u00e1ltott fesz\u00fclts\u00e9g, amely az \u00f6nt\u00f6tt alkatr\u00e9szben megdermed. Ez lehet \u00e1raml\u00e1s- vagy h\u0151induk\u00e1lt. A marad\u00f3 fesz\u00fclts\u00e9gek hasonl\u00f3an hatnak az alkatr\u00e9szre, mint a k\u00fcls\u0151leg alkalmazott fesz\u00fclts\u00e9gek. Ha el\u00e9g er\u0151sek ahhoz, hogy legy\u0151zz\u00e9k az alkatr\u00e9sz szerkezeti integrit\u00e1s\u00e1t, akkor az alkatr\u00e9sz k\u00fcls\u0151 \u00fczemi terhel\u00e9s hat\u00e1s\u00e1ra kil\u00f6k\u00e9skor megvetemedik, vagy k\u00e9s\u0151bb megreped. A marad\u00f3 fesz\u00fclts\u00e9gek az alkatr\u00e9sz zsugorod\u00e1s\u00e1nak \u00e9s vetemed\u00e9s\u00e9nek f\u0151 okai. Az \u00fcregkit\u00f6lt\u00e9s sor\u00e1n a ny\u00edr\u00f3fesz\u00fclts\u00e9get cs\u00f6kkent\u0151 folyamatfelt\u00e9telek \u00e9s tervez\u00e9si elemek seg\u00edtenek az \u00e1raml\u00e1s okozta marad\u00f3 fesz\u00fclts\u00e9gek cs\u00f6kkent\u00e9s\u00e9ben. Hasonl\u00f3k\u00e9ppen, azok, amelyek el\u0151seg\u00edtik a megfelel\u0151 t\u00f6m\u00f6r\u00edt\u00e9st \u00e9s az egyenletes szersz\u00e1mh\u0171t\u00e9st, cs\u00f6kkenteni fogj\u00e1k a h\u0151 okozta marad\u00f3 fesz\u00fclts\u00e9get. A sz\u00e1lakkal t\u00f6lt\u00f6tt anyagok eset\u00e9ben azok a technol\u00f3giai felt\u00e9telek, amelyek el\u0151seg\u00edtik az egyenletes mechanikai tulajdons\u00e1gok kialakul\u00e1s\u00e1t, cs\u00f6kkentik a h\u0151 okozta marad\u00f3 fesz\u00fclts\u00e9get.\u00a0<a title=\"K\u00edna pen\u00e9sz sz\u00e1ll\u00edt\u00f3\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">K\u00edna pen\u00e9sz sz\u00e1ll\u00edt\u00f3<\/a><\/p>\n<h1>\u00c1raml\u00e1s okozta marad\u00f3 fesz\u00fclts\u00e9g<\/h1>\n<p>A fesz\u00fclts\u00e9g n\u00e9lk\u00fcli, hossz\u00fa l\u00e1nc\u00fa polimer molekul\u00e1k az olvad\u00e9kh\u0151m\u00e9rs\u00e9kletn\u00e9l magasabb h\u0151m\u00e9rs\u00e9kleten (azaz olvadt \u00e1llapotban) hajlamosak v\u00e9letlenszer\u0171 tekercses egyens\u00falyi \u00e1llapotba ker\u00fclni. A feldolgoz\u00e1s sor\u00e1n a molekul\u00e1k az \u00e1raml\u00e1s ir\u00e1ny\u00e1ba orient\u00e1l\u00f3dnak, ahogy a polimer ny\u00edr\u00f3dik \u00e9s megny\u00falik. Ha a megszil\u00e1rdul\u00e1s azel\u0151tt k\u00f6vetkezik be, hogy a polimer molekul\u00e1k teljesen ellazuln\u00e1nak az egyens\u00falyi \u00e1llapotukba, a molekul\u00e1ris orient\u00e1ci\u00f3 r\u00f6gz\u00fcl a<br \/>\n\u00f6nt\u00f6tt alkatr\u00e9sz. Ezt a fajta befagyott fesz\u00fclts\u00e9ges \u00e1llapotot gyakran nevezik \u00e1raml\u00e1s okozta marad\u00f3 fesz\u00fclts\u00e9gnek. Az \u00e1raml\u00e1s ir\u00e1ny\u00e1ban megny\u00fajtott molekul\u00e1ris orient\u00e1ci\u00f3 miatt anizotr\u00f3p, nem egyenletes zsugorod\u00e1st \u00e9s mechanikai tulajdons\u00e1gokat vezet be az \u00e1raml\u00e1s ir\u00e1ny\u00e1val p\u00e1rhuzamos \u00e9s arra mer\u0151leges ir\u00e1nyokban.<\/p>\n<h2>Befagyasztott molekul\u00e1ris orient\u00e1ci\u00f3<\/h2>\n<p>A nagy ny\u00edr\u00f3fesz\u00fclts\u00e9g \u00e9s a szersz\u00e1mfal melletti nagy h\u0171t\u00e9si sebess\u00e9g kombin\u00e1ci\u00f3ja miatt k\u00f6zvetlen\u00fcl az alkatr\u00e9sz fel\u00fclete alatt egy er\u0151sen orient\u00e1lt r\u00e9teg fagyott meg. Ezt az 1. \u00e1bra szeml\u00e9lteti. A nagy foly\u00e1si marad\u00f3 fesz\u00fclts\u00e9gekkel (vagy befagyott orient\u00e1ci\u00f3val) rendelkez\u0151 alkatr\u00e9sz k\u00e9s\u0151bbi magas h\u0151m\u00e9rs\u00e9kletnek val\u00f3 kit\u00e9tele lehet\u0151v\u00e9 teheti a fesz\u00fclts\u00e9gek egy r\u00e9sz\u00e9nek felold\u00e1s\u00e1t. Ez jellemz\u0151en az alkatr\u00e9sz zsugorod\u00e1s\u00e1t \u00e9s vetemed\u00e9s\u00e9t eredm\u00e9nyezi. A fagyott r\u00e9tegek h\u0151szigetel\u0151 hat\u00e1sa miatt a forr\u00f3 magban l\u00e9v\u0151 polimerolvad\u00e9k nagyobb m\u00e9rt\u00e9kben k\u00e9pes relax\u00e1lni, ami alacsony molekul\u00e1ris orient\u00e1ci\u00f3s z\u00f3n\u00e1hoz vezet.\u00a0<a title=\"K\u00edna pen\u00e9sz sz\u00e1ll\u00edt\u00f3\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">K\u00edna pen\u00e9sz sz\u00e1ll\u00edt\u00f3<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1303\" title=\"Fagyasztott-molekul\u00e1ris-orient\u00e1lt\" src=\"https:\/\/web.archive.org\/web\/20130131102842im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Frozen-in-molecular-orienta.gif\" alt=\"Fagyasztott-molekul\u00e1ris-orient\u00e1lt\" width=\"579\" height=\"258\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>1. \u00c1BRA.<\/strong>\u00a0A t\u00f6lt\u00e9si \u00e9s csomagol\u00e1si f\u00e1zisok sor\u00e1n a befagyott molekul\u00e1ris orient\u00e1ci\u00f3 miatt kialakul\u00f3 \u00e1raml\u00e1si marad\u00f3 fesz\u00fclts\u00e9gek.<br \/>\n(1) Magas h\u0171t\u00e9si, ny\u00edr\u00e1si \u00e9s orient\u00e1ci\u00f3s z\u00f3na (2) Alacsony h\u0171t\u00e9si, ny\u00edr\u00e1si \u00e9s orient\u00e1ci\u00f3s z\u00f3na<\/p>\n<h2>Az \u00e1raml\u00e1s okozta marad\u00f3 fesz\u00fclts\u00e9g cs\u00f6kkent\u00e9se<\/h2>\n<p>Az olvad\u00e9kban l\u00e9v\u0151 ny\u00edr\u00f3fesz\u00fclts\u00e9get cs\u00f6kkent\u0151 technol\u00f3giai felt\u00e9telek cs\u00f6kkentik az \u00e1raml\u00e1s okozta marad\u00f3 fesz\u00fclts\u00e9gek szintj\u00e9t. \u00c1ltal\u00e1ban az \u00e1raml\u00e1s okozta marad\u00f3 fesz\u00fclts\u00e9g egy nagys\u00e1grenddel kisebb, mint a h\u0151 okozta marad\u00f3 fesz\u00fclts\u00e9g.\u00a0<a title=\"K\u00edna pen\u00e9sz sz\u00e1ll\u00edt\u00f3\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">K\u00edna pen\u00e9sz sz\u00e1ll\u00edt\u00f3<\/a><\/p>\n<ul>\n<li>magasabb olvad\u00e1si h\u0151m\u00e9rs\u00e9klet<\/li>\n<li>magasabb pen\u00e9szfal-h\u0151m\u00e9rs\u00e9klet<\/li>\n<li>hosszabb t\u00f6lt\u00e9si id\u0151 (alacsonyabb olvad\u00e1si sebess\u00e9g)<\/li>\n<li>cs\u00f6kkentett t\u00f6m\u00edt\u00e9si nyom\u00e1s<\/li>\n<li>r\u00f6videbb \u00e1raml\u00e1si \u00fatvonal.<\/li>\n<\/ul>\n<h1>\u00a0Termikusan kiv\u00e1ltott marad\u00f3 fesz\u00fclts\u00e9g<\/h1>\n<p>A h\u0151hat\u00e1s okozta marad\u00f3 fesz\u00fclts\u00e9g a k\u00f6vetkez\u0151 okok miatt l\u00e9p fel:<\/p>\n<ul>\n<li>Az anyag zsugorodik, ahogy a h\u0151m\u00e9rs\u00e9klet a folyamat be\u00e1ll\u00edt\u00e1sait\u00f3l a folyamat befejez\u00e9sekor el\u00e9rt k\u00f6rnyezeti felt\u00e9telekig cs\u00f6kken.<\/li>\n<li>Az anyagelemek k\u00fcl\u00f6nb\u00f6z\u0151 h\u0151-mechanikai t\u00f6rt\u00e9n\u00e9seket (pl. k\u00fcl\u00f6nb\u00f6z\u0151 h\u0171t\u00e9si sebess\u00e9gek \u00e9s t\u00f6m\u00f6r\u00edt\u00e9si nyom\u00e1sok) tapasztalnak, ahogy az anyag a szersz\u00e1m fal\u00e1t\u00f3l a k\u00f6z\u00e9ppont fel\u00e9 haladva megszil\u00e1rdul.<\/li>\n<li>A v\u00e1ltoz\u00f3 nyom\u00e1s, h\u0151m\u00e9rs\u00e9klet, molekul\u00e1ris \u00e9s sz\u00e1lorient\u00e1ci\u00f3 v\u00e1ltoz\u00f3 s\u0171r\u0171s\u00e9get \u00e9s mechanikai tulajdons\u00e1gokat eredm\u00e9nyez.<\/li>\n<li>Bizonyos szersz\u00e1mkorl\u00e1toz\u00e1sok megakad\u00e1lyozz\u00e1k, hogy a fr\u00f6ccs\u00f6nt\u00f6tt alkatr\u00e9sz a s\u00edk ir\u00e1nyokban zsugorodjon.<\/li>\n<\/ul>\n<h2>P\u00e9lda a szabad olt\u00e1sra<\/h2>\n<p>A fr\u00f6ccs\u00f6nt\u00e9s sor\u00e1n bek\u00f6vetkez\u0151 anyagzsugorod\u00e1s k\u00e9nyelmesen szeml\u00e9ltethet\u0151 egy olyan p\u00e9ld\u00e1val, ahol egy egyenletes h\u0151m\u00e9rs\u00e9klet\u0171 alkatr\u00e9sz hirtelen hideg szersz\u00e1mfalak k\u00f6z\u00e9 ker\u00fcl. A korai h\u0171t\u00e9si szakaszokban, amikor a k\u00fcls\u0151 fel\u00fcleti r\u00e9tegek leh\u0171lnek \u00e9s zsugorodni kezdenek, a forr\u00f3 magban l\u00e9v\u0151 polimer nagy r\u00e9sze m\u00e9g mindig olvadt \u00e9s szabadon \u00f6sszeh\u00faz\u00f3dhat. Azonban ahogy a bels\u0151 mag leh\u0171l, a helyi termikus \u00f6sszeh\u00faz\u00f3d\u00e1st a m\u00e1r merev k\u00fcls\u0151 r\u00e9tegek korl\u00e1tozz\u00e1k. Ez egy tipikus fesz\u00fclts\u00e9geloszl\u00e1si \u00e1llapotot eredm\u00e9nyez, ahol a magban l\u00e9v\u0151 fesz\u00fclts\u00e9get a k\u00fcls\u0151 r\u00e9tegek \u00f6sszenyom\u00f3d\u00e1sa ellens\u00falyozza, amint azt az al\u00e1bbi 2. \u00e1bra szeml\u00e9lteti.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1304\" title=\"Free-quenching-p\u00e9lda\" src=\"https:\/\/web.archive.org\/web\/20130131102842im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Free-quenching-example.gif\" alt=\"Free-quenching-p\u00e9lda\" width=\"579\" height=\"258\" \/><\/p>\n<p><strong>2. \u00c1BRA.<\/strong>\u00a0A marad\u00f3 h\u0151fesz\u00fclts\u00e9gek kialakul\u00e1sa egy \"szabadon olvad\u00f3\" alkatr\u00e9szben, ami az \u00f6nt\u00f6tt alkatr\u00e9szen kereszt\u00fcli h\u0171t\u00e9s v\u00e1ltoz\u00e1sa \u00e9s az anyag reakci\u00f3ja a h\u0151m\u00e9rs\u00e9klet-el\u0151zm\u00e9nyekre.<\/p>","protected":false},"excerpt":{"rendered":"<p>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. If they are strong enough to overcome the structural integrity of the part, the part will warp upon ejection, or later [&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-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 v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\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\/hu\/2018\/10\/17\/kapitel-25-1-restspanning\/\" \/>\n<meta property=\"og:locale\" content=\"hu_HU\" \/>\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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