{"id":608,"date":"2018-10-17T00:17:44","date_gmt":"2018-10-16T16:17:44","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=608"},"modified":"2018-10-17T00:17:44","modified_gmt":"2018-10-16T16:17:44","slug":"chapter-23alternative-cooling-devices","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/cs\/2018\/10\/17\/kapitola-23alternativni-chladici-zarizeni\/","title":{"rendered":"Kapitola 23,Alternativn\u00ed chladic\u00ed za\u0159\u00edzen\u00ed"},"content":{"rendered":"

Co d\u011blaj\u00ed?<\/h1>\n

P\u0159ep\u00e1\u017eky a bublinky jsou \u00faseky chladic\u00edho potrub\u00ed, kter\u00e9 odv\u00e1d\u011bj\u00ed proud chladic\u00ed kapaliny do m\u00edst, kde by za norm\u00e1ln\u00edch okolnost\u00ed chyb\u011blo chlazen\u00ed. Chladic\u00ed kan\u00e1ly jsou obvykle vyvrt\u00e1ny skrz dutinu formy a j\u00e1dro. Forma se v\u0161ak m\u016f\u017ee skl\u00e1dat z oblast\u00ed, kter\u00e9 jsou p\u0159\u00edli\u0161 vzd\u00e1len\u00e9 na to, aby se do nich ve\u0161ly b\u011b\u017en\u00e9 chladic\u00ed kan\u00e1ly. Alternativn\u00ed metody chlazen\u00ed t\u011bchto oblast\u00ed rovnom\u011brn\u011b se zbytkem d\u00edlu zahrnuj\u00ed pou\u017eit\u00ed baffl\u016f, bublin nebo tepeln\u00fdch kol\u00edk\u016f, jak je uvedeno n\u00ed\u017ee.<\/p>\n

\"\"<\/p>\n

OBR\u00c1ZEK 1. P\u0159ep\u00e1\u017eka, bublinkova\u010d a tepeln\u00fd kol\u00edk<\/h3>\n

Baffles<\/h1>\n

P\u0159ep\u00e1\u017eka je vlastn\u011b chladic\u00ed kan\u00e1l vyvrtan\u00fd kolmo k hlavn\u00edmu chladic\u00edmu potrub\u00ed s lopatkou, kter\u00e1 rozd\u011bluje jeden chladic\u00ed pr\u016fchod na dva p\u016flkruhov\u00e9 kan\u00e1ly. Chladic\u00ed kapalina proud\u00ed jednou stranou lopatky z hlavn\u00edho chladic\u00edho potrub\u00ed, ot\u00e1\u010d\u00ed se kolem hrotu na druhou stranu p\u0159ep\u00e1\u017eky a pak proud\u00ed zp\u011bt do hlavn\u00edho chladic\u00edho potrub\u00ed.<\/p>\n

Tato metoda poskytuje maxim\u00e1ln\u00ed pr\u016f\u0159ez pro chladic\u00ed kapalinu, ale je obt\u00ed\u017en\u00e9 namontovat rozd\u011blova\u010d p\u0159esn\u011b uprost\u0159ed. Chladic\u00ed \u00fa\u010dinek a s n\u00edm i rozlo\u017een\u00ed teploty na jedn\u00e9 stran\u011b j\u00e1dra se m\u016f\u017ee li\u0161it od rozlo\u017een\u00ed teploty na druh\u00e9 stran\u011b. Tuto nev\u00fdhodu jinak ekonomick\u00e9ho \u0159e\u0161en\u00ed, pokud jde o v\u00fdrobu, lze odstranit, pokud je plech tvo\u0159\u00edc\u00ed p\u0159ep\u00e1\u017eku zkroucen\u00fd. Nap\u0159\u00edklad \u0161roubovicov\u00e1 p\u0159ep\u00e1\u017eka, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 2 n\u00ed\u017ee, p\u0159iv\u00e1d\u00ed chladic\u00ed kapalinu ke \u0161pi\u010dce a zp\u011bt ve tvaru \u0161roubovice. Je u\u017eite\u010dn\u00e1 pro pr\u016fm\u011bry 12 a\u017e 50 mm a umo\u017e\u0148uje velmi homogenn\u00ed rozlo\u017een\u00ed teploty. Dal\u0161\u00edm logick\u00fdm v\u00fdvojem p\u0159ep\u00e1\u017eek jsou jedno- nebo dvoulet\u00e1 spir\u00e1lov\u00e1 j\u00e1dra, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 2 n\u00ed\u017ee.<\/p>\n

\"\"<\/p>\n

OBR\u00c1ZEK 2. (Vlevo) \u0160roubovicov\u00e1 p\u0159ep\u00e1\u017eka. (Vpravo) Spir\u00e1lov\u00e1 p\u0159ep\u00e1\u017eka.<\/h3>\n

Bublinky<\/h1>\n

Bublinkova\u010d je podobn\u00fd p\u0159ep\u00e1\u017ece, jen m\u00edsto lopatky je zde mal\u00e1 trubi\u010dka. Chladic\u00ed kapalina proud\u00ed do spodn\u00ed \u010d\u00e1sti trubice a \"bubl\u00e1\" z jej\u00ed horn\u00ed \u010d\u00e1sti, podobn\u011b jako u font\u00e1ny. Chladic\u00ed kapalina pak st\u00e9k\u00e1 dol\u016f kolem vn\u011bj\u0161\u00ed strany trubice a pokra\u010duje v proud\u011bn\u00ed chladic\u00edmi kan\u00e1ly.<\/p>\n

Nej\u00fa\u010dinn\u011bj\u0161\u00edho chlazen\u00ed \u0161t\u00edhl\u00fdch jader se dosahuje pomoc\u00ed bublinek. Pr\u016fm\u011br obou mus\u00ed b\u00fdt nastaven tak, aby byl odpor proud\u011bn\u00ed v obou pr\u016f\u0159ezech stejn\u00fd. Podm\u00ednkou pro to je:<\/p>\n

Vnit\u0159n\u00ed pr\u016fm\u011br \/ vn\u011bj\u0161\u00ed pr\u016fm\u011br = 0,707<\/p>\n

Bublinky jsou komer\u010dn\u011b dostupn\u00e9 a obvykle se \u0161roubuj\u00ed do j\u00e1dra, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 3 n\u00ed\u017ee. Do pr\u016fm\u011bru 4 mm je t\u0159eba trubku na konci zkosit, aby se zv\u011bt\u0161il pr\u016f\u0159ez v\u00fdvodu; tato technika je zn\u00e1zorn\u011bna na obr\u00e1zku 3. Bublinky lze pou\u017e\u00edt nejen k chlazen\u00ed j\u00e1dra, ale jsou ur\u010deny i k chlazen\u00ed ploch\u00fdch \u010d\u00e1st\u00ed formy, kter\u00e9 nelze vybavit vrtan\u00fdmi nebo fr\u00e9zovan\u00fdmi kan\u00e1ly.<\/p>\n

\"\"<\/p>\n

OBR\u00c1ZEK 3. (Vlevo) Bublinky za\u0161roubovan\u00e9 do j\u00e1dra. (Vpravo) Bublinky zkosen\u00e9 pro zv\u011bt\u0161en\u00ed v\u00fdstupu.<\/p>\n

POZN\u00c1MKA:<\/strong>\u00a0Proto\u017ee p\u0159ep\u00e1\u017eky i bublinky maj\u00ed z\u00fa\u017een\u00e9 pr\u016fto\u010dn\u00e9 plochy, zvy\u0161uje se odpor proud\u011bn\u00ed. Proto je t\u0159eba v\u011bnovat pozornost n\u00e1vrhu velikosti t\u011bchto za\u0159\u00edzen\u00ed. Pr\u016ftok a p\u0159enos tepla u p\u0159ep\u00e1\u017eek i bublin lze snadno modelovat a analyzovat pomoc\u00ed anal\u00fdzy C-MOLD Cooling.<\/p>\n

Tepeln\u00e9 kol\u00edky<\/h1>\n

Alternativou k p\u0159ep\u00e1\u017ek\u00e1m a bublin\u00e1m je tepeln\u00fd kol\u00edk. Jedn\u00e1 se o uzav\u0159en\u00fd v\u00e1lec napln\u011bn\u00fd kapalinou. Kapalina se odpa\u0159uje, kdy\u017e odeb\u00edr\u00e1 teplo z n\u00e1strojov\u00e9 oceli, a kondenzuje, kdy\u017e uvol\u0148uje teplo do chladic\u00ed kapaliny, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 4. \u00da\u010dinnost p\u0159enosu tepla tepeln\u00e9ho kol\u00edku je t\u00e9m\u011b\u0159 desetkr\u00e1t v\u011bt\u0161\u00ed ne\u017e u m\u011bd\u011bn\u00e9 trubky. Pro dobrou tepelnou vodivost se vyhn\u011bte vzduchov\u00e9 meze\u0159e mezi tepeln\u00fdm kol\u00edkem a formou nebo ji vypl\u0148te vysoce vodiv\u00fdm tmelem.<\/p>\n

\"\"<\/p>\n

OBR\u00c1ZEK 4. \u00da\u010dinnost p\u0159enosu tepla tepeln\u00fdm kol\u00edkem<\/h3>\n

Chlazen\u00ed \u0161t\u00edhl\u00fdch jader<\/h1>\n

Pokud je pr\u016fm\u011br nebo \u0161\u00ed\u0159ka velmi mal\u00e1 (m\u00e9n\u011b ne\u017e 3 mm), je mo\u017en\u00e9 pouze chlazen\u00ed vzduchem. Vzduch je p\u0159i otev\u00edr\u00e1n\u00ed formy vh\u00e1n\u011bn na j\u00e1dra zven\u010d\u00ed nebo proud\u00ed centr\u00e1ln\u00edm otvorem zevnit\u0159, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 5. Tento postup samoz\u0159ejm\u011b neumo\u017e\u0148uje udr\u017eet p\u0159esnou teplotu formy.<\/p>\n

\"\"<\/p>\n

OBR\u00c1ZEK 5. Vzduchov\u00e9 chlazen\u00ed \u0161t\u00edhl\u00e9ho j\u00e1dra<\/h3>\n

Lep\u0161\u00edho chlazen\u00ed \u0161t\u00edhl\u00fdch jader (s rozm\u011bry men\u0161\u00edmi ne\u017e 5 mm) se dosahuje pou\u017eit\u00edm vlo\u017eek z materi\u00e1l\u016f s vysokou tepelnou vodivost\u00ed, jako jsou m\u011bd\u011bn\u00e9 nebo beryllium-m\u011bd\u011bn\u00e9 materi\u00e1ly. Tato technika je zn\u00e1zorn\u011bna na obr\u00e1zku 6 n\u00ed\u017ee. Takov\u00e9 vlo\u017eky jsou do j\u00e1dra zalisov\u00e1ny a svou z\u00e1kladnou, kter\u00e1 m\u00e1 co nejv\u011bt\u0161\u00ed pr\u016f\u0159ez, zasahuj\u00ed do chladic\u00edho kan\u00e1lu.<\/p>\n

\"\"<\/p>\n

OBR\u00c1ZEK 6. Pou\u017eit\u00ed materi\u00e1lu s vysokou tepelnou vodivost\u00ed k chlazen\u00ed \u0161t\u00edhl\u00e9ho j\u00e1dra<\/h3>\n

Chlazen\u00ed velk\u00fdch jader<\/h1>\n

U velk\u00fdch pr\u016fm\u011br\u016f j\u00e1dra (40 mm a v\u00edce) mus\u00ed b\u00fdt zaji\u0161t\u011bn pozitivn\u00ed transport chladic\u00ed kapaliny. Toho lze dos\u00e1hnout pomoc\u00ed desti\u010dek, u nich\u017e chladic\u00ed kapalina dosahuje ke \u0161pi\u010dce j\u00e1dra st\u0159edov\u00fdm otvorem a je vedena spir\u00e1lou k jeho obvodu a mezi j\u00e1drem a desti\u010dkou \u0161roubovit\u011b k v\u00fdstupu, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 7. Tato konstrukce v\u00fdrazn\u011b oslabuje j\u00e1dro.<\/p>\n

\"\"<\/p>\n

OBR\u00c1ZEK 7. Pou\u017eit\u00ed \u0161roubovicov\u00e9 p\u0159ep\u00e1\u017eky k chlazen\u00ed velk\u00e9ho j\u00e1dra<\/h3>\n

Chlazen\u00ed jader v\u00e1lc\u016f<\/h1>\n

Chlazen\u00ed jader v\u00e1lc\u016f a jin\u00fdch kulat\u00fdch d\u00edl\u016f by m\u011blo b\u00fdt prov\u00e1d\u011bno pomoc\u00ed dvojit\u00e9 \u0161roubovice, jak je zn\u00e1zorn\u011bno n\u00ed\u017ee. Chladic\u00ed kapalina proud\u00ed do \u0161pi\u010dky j\u00e1dra v jedn\u00e9 \u0161roubovici a vrac\u00ed se zp\u011bt v druh\u00e9 \u0161roubovici. Z konstruk\u010dn\u00edch d\u016fvod\u016f by tlou\u0161\u0165ka st\u011bny j\u00e1dra m\u011bla b\u00fdt v tomto p\u0159\u00edpad\u011b alespo\u0148 3 mm.<\/p>\n

\"\"OBR\u00c1ZEK 8. Dvojit\u00e1 \u0161roubovice se st\u0159edov\u00fdm bublinkova\u010dem<\/p>","protected":false},"excerpt":{"rendered":"

What do they do? Baffles and bubblers are sections of cooling lines that divert the coolant flow into areas that would normally lack cooling. Cooling channels are typically drilled through the mold cavity and core. The mold, however, may consist of areas too far away to accommodate regular cooling channels. Alternate methods for cooling these […]<\/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-608","post","type-post","status-publish","format-standard","hentry","category-mould-technology-blog-1"],"yoast_head":"\nChapter 23,Alternative cooling devices - 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\/cs\/2018\/10\/17\/bolum-23alternati\u0307f-sogutma-ci\u0307hazlari\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chapter 23,Alternative cooling devices - Plastic Mold | China Mold Maker\" \/>\n<meta property=\"og:description\" content=\"What do they do? 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Baffles and bubblers are sections of cooling lines that divert the coolant flow into areas that would normally lack cooling. Cooling channels are typically drilled through the mold cavity and core. The mold, however, may consist of areas too far away to accommodate regular cooling channels. 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