{"id":23493,"date":"2025-03-09T13:30:22","date_gmt":"2025-03-09T05:30:22","guid":{"rendered":"https:\/\/moldiecasting.com\/?p=23493"},"modified":"2026-10-09T02:21:36","modified_gmt":"2026-10-08T18:21:36","slug":"die-casting-porosity","status":"publish","type":"post","link":"https:\/\/moldiecasting.com\/cs\/blog\/die-casting-porosity\/","title":{"rendered":"P\u00f3rovitost p\u0159i tlakov\u00e9m lit\u00ed: p\u0159\u00ed\u010diny a \u0159e\u0161en\u00ed pro kvalitn\u011bj\u0161\u00ed d\u00edly"},"content":{"rendered":"<p><span style=\"font-size: 16px; font-weight: 500;\">Tlakov\u00e9 lit\u00ed je proces tv\u00e1\u0159en\u00ed kov\u016f, p\u0159i n\u011bm\u017e se vst\u0159ikov\u00e1n\u00edm roztaven\u00e9ho kovu do opakovan\u011b pou\u017eiteln\u00fdch forem vyr\u00e1b\u011bj\u00ed p\u0159esn\u00e9 d\u00edly s jemn\u00fdmi detaily.<\/span><\/p>\n<p>Nab\u00edz\u00ed vynikaj\u00edc\u00ed rozm\u011brovou p\u0159esnost, hladk\u00fd povrch a slo\u017eit\u00e9 tvary, kter\u00fdch by bylo jin\u00fdmi metodami obt\u00ed\u017en\u00e9 dos\u00e1hnout.<\/p>\n<p>Tlakov\u00e9 lit\u00ed za\u010d\u00edn\u00e1 p\u0159\u00edpravou ocelov\u00e9 formy. Ta se skl\u00e1d\u00e1 ze dvou polovin, kter\u00e9 se spoj\u00ed a vytvo\u0159\u00ed dutinu ve tvaru v\u00fdsledn\u00e9ho d\u00edlu.<\/p>\n<p>Na za\u010d\u00e1tku procesu se forma uzav\u0159e velmi vysokou silou.<\/p>\n<p>Pot\u00e9 se do formy pod vysok\u00fdm tlakem vst\u0159\u00edkne roztaven\u00fd kov. Ten velmi rychle vypln\u00ed celou dutinu, co\u017e umo\u017e\u0148uje vyr\u00e1b\u011bt detailn\u00ed d\u00edly s tenk\u00fdmi st\u011bnami.<\/p>\n<p>Po ztuhnut\u00ed kovu se forma otev\u0159e a d\u00edl se vyjme. Proces lze rychle opakovat a vyrobit stovky stejn\u00fdch d\u00edl\u016f za hodinu.<\/p>\n<h2>Co je p\u00f3rovitost p\u0159i tlakov\u00e9m lit\u00ed<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-704\" src=\"https:\/\/moldiecasting.com\/wp-content\/uploads\/2025\/03\/Die-Casting-Porosity-3.jpg\" alt=\"Sch\u00e9ma t\u0159\u00ed typ\u016f p\u00f3rovitosti: slep\u00e9, pr\u016fchoz\u00ed a zcela uzav\u0159en\u00e9 p\u00f3ry s popisem jejich um\u00edst\u011bn\u00ed a vlivu.\" width=\"800\" height=\"450\" srcset=\"https:\/\/moldiecasting.com\/wp-content\/uploads\/2025\/03\/Die-Casting-Porosity-3.jpg 800w, https:\/\/moldiecasting.com\/wp-content\/uploads\/2025\/03\/Die-Casting-Porosity-3-300x169.jpg 300w, https:\/\/moldiecasting.com\/wp-content\/uploads\/2025\/03\/Die-Casting-Porosity-3-768x432.jpg 768w, https:\/\/moldiecasting.com\/wp-content\/uploads\/2025\/03\/Die-Casting-Porosity-3-18x10.jpg 18w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>Vysok\u00e1 rychlost tlakov\u00e9ho lit\u00ed zp\u016fsobuje, \u017ee ur\u010dit\u00e9 p\u00f3rovitosti se t\u00e9m\u011b\u0159 nelze vyhnout.<\/p>\n<p>P\u00f3rovitost ozna\u010duje otvory, dutiny nebo vzduchov\u00e9 kapsy uvnit\u0159 \u010di na povrchu tlakov\u011b lit\u00e9ho d\u00edlu. Vady sahaj\u00ed od drobn\u00fdch mikroskopick\u00fdch p\u00f3r\u016f a\u017e po v\u011bt\u0161\u00ed, viditeln\u00e9 dutiny.<\/p>\n<p>N\u011bkdy se projev\u00ed jako drobn\u00e9 prohlubn\u011b na povrchu, jindy se odhal\u00ed uvnit\u0159 d\u00edlu p\u0159i zkou\u0161k\u00e1ch.<\/p>\n<p>P\u00f3rovitost si lze p\u0159edstavit jako ne\u017e\u00e1douc\u00ed pr\u00e1zdn\u00e1 m\u00edsta v kovu, kter\u00fd by m\u011bl b\u00fdt kompaktn\u00ed. Dutiny se mohou vyskytovat v r\u016fzn\u00fdch podob\u00e1ch:<\/p>\n<ul>\n<li><strong>Povrchov\u00e1 p\u00f3rovitost<\/strong>: viditeln\u00e1 na vn\u011bj\u0161\u00ed stran\u011b d\u00edlu<\/li>\n<li><strong>Vnit\u0159n\u00ed p\u00f3rovitost<\/strong>: skryt\u00e1 uvnit\u0159 struktury d\u00edlu<\/li>\n<li><strong>Plynov\u00e1 p\u00f3rovitost<\/strong>: vznik\u00e1 zachycen\u00fdmi plyny<\/li>\n<li><strong>Smr\u0161\u0165ovac\u00ed p\u00f3rovitost<\/strong>: vznik\u00e1 p\u0159i chladnut\u00ed a smr\u0161\u0165ov\u00e1n\u00ed kovu<\/li>\n<\/ul>\n<p>P\u00f3rovitost je p\u0159i tlakov\u00e9m lit\u00ed pom\u011brn\u011b b\u011b\u017en\u00e1. V\u011bt\u0161ina v\u00fdrobc\u016f p\u0159ipou\u0161t\u00ed ur\u010ditou m\u00edru vnit\u0159n\u00ed p\u00f3rovitosti, nadm\u011brn\u00e1 nebo povrchov\u00e1 p\u00f3rovitost v\u0161ak m\u016f\u017ee zp\u016fsobit nepou\u017eitelnost d\u00edlu.<\/p>\n<h3>P\u0159\u00ed\u010diny p\u00f3rovitosti p\u0159i tlakov\u00e9m lit\u00ed<\/h3>\n<p>K p\u00f3rovitosti p\u0159i tlakov\u00e9m lit\u00ed p\u0159isp\u00edv\u00e1 n\u011bkolik faktor\u016f. Hlavn\u00ed p\u0159\u00ed\u010dinou je vzduch nebo plyn zachycen\u00fd b\u011bhem vst\u0159ikov\u00e1n\u00ed kovu. Kdy\u017e roztaven\u00fd kov rychle vnik\u00e1 do formy, m\u016f\u017ee v n\u00ed uv\u011bznit vzduch, kter\u00fd nem\u00e1 kudy uniknout.<\/p>\n<p>P\u00f3rovitost zp\u016fsobuje tak\u00e9 nedostate\u010dn\u00e1 kontrola teploty. Pokud teplota p\u0159i odl\u00e9v\u00e1n\u00ed nen\u00ed rovnom\u011brn\u00e1, kov tuhne r\u016fznou rychlost\u00ed a vznikaj\u00ed dutiny.<\/p>\n<p>Mezi dal\u0161\u00ed b\u011b\u017en\u00e9 p\u0159\u00ed\u010diny pat\u0159\u00ed:<\/p>\n<ul>\n<li>Nedostate\u010dn\u00e9 odvzdu\u0161n\u011bn\u00ed v konstrukci formy<\/li>\n<li>P\u0159\u00edli\u0161 mnoho maziva na povrchu formy<\/li>\n<li>Nespr\u00e1vn\u011b navr\u017een\u00e1 vtokov\u00e1 nebo rozv\u00e1d\u011bc\u00ed soustava<\/li>\n<li>Nespr\u00e1vn\u00e1 rychlost vst\u0159ikov\u00e1n\u00ed kovu<\/li>\n<li>Turbulentn\u00ed proud\u011bn\u00ed kovu p\u0159i pln\u011bn\u00ed<\/li>\n<\/ul>\n<h2>Jak p\u0159edch\u00e1zet nadm\u011brn\u00e9 p\u00f3rovitosti<\/h2>\n<h3>Konstruk\u010dn\u00ed hlediska<\/h3>\n<p>Za\u010dn\u011bte n\u00e1vrhem formy, kter\u00fd podporuje plynul\u00e9 proud\u011bn\u00ed kovu. Vyhn\u011bte se ostr\u00fdm roh\u016fm a n\u00e1hl\u00fdm zm\u011bn\u00e1m tlou\u0161\u0165ky, kde by se mohl zachytit vzduch nebo vznikat turbulence.<\/p>\n<p>Do <a href=\"https:\/\/moldiecasting.com\/cs\/die-casting-mold-design\/\">konstrukce formy<\/a> zahr\u0148te spr\u00e1vn\u011b dimenzovan\u00e9 p\u0159etokov\u00e9 a odvzdu\u0161\u0148ovac\u00ed kan\u00e1ly. Umo\u017en\u00ed plyn\u016fm b\u011bhem lit\u00ed unikat a sn\u00ed\u017e\u00ed mno\u017estv\u00ed zachycen\u00fdch vzduchov\u00fdch bublin.<\/p>\n<p>Zva\u017ete dopln\u011bn\u00ed syst\u00e9mu tlakov\u00e9ho lit\u00ed o vakuovou podporu. Ta p\u0159ed vstupem roztaven\u00e9ho kovu odsaje vzduch z dutiny formy a v\u00fdrazn\u011b omez\u00ed plynovou p\u00f3rovitost.<\/p>\n<p>Zajist\u011bte, aby vtokov\u00e1 soustava vedla proud kovu sm\u011brem k odvzdu\u0161\u0148ovac\u00edm kan\u00e1l\u016fm a plyny v n\u011bm nezachycovala.<\/p>\n<h3>V\u00fdb\u011br materi\u00e1lu<\/h3>\n<p>Kdykoli je to mo\u017en\u00e9, volte <a href=\"https:\/\/moldiecasting.com\/cs\/blog\/aluminum-die-casting-machine\/\">hlin\u00edkov\u00e9 slitiny<\/a> s ni\u017e\u0161\u00ed schopnost\u00ed pohlcovat plyny. N\u011bkter\u00e9 slitiny p\u0159irozen\u011b odol\u00e1vaj\u00ed pohlcov\u00e1n\u00ed vod\u00edku, \u010d\u00edm\u017e se sni\u017euje riziko plynov\u00e9 p\u00f3rovitosti.<\/p>\n<p>P\u0159ed odl\u00e9v\u00e1n\u00edm kov \u0159\u00e1dn\u011b odplyn\u011bte.<\/p>\n<p>Materi\u00e1ly skladujte v kontrolovan\u00e9m prost\u0159ed\u00ed, aby neabsorbovaly vlhkost. Vlhkost m\u016f\u017ee p\u0159i taven\u00ed zan\u00e9st vod\u00edk do slitiny.<\/p>\n<p>Lze tak\u00e9 pou\u017e\u00edt tavidla, kter\u00e1 pom\u00e1haj\u00ed odstranit ne\u010distoty zp\u016fsobuj\u00edc\u00ed p\u00f3rovitost. \u010cist\u00fd kov vede k \u010dist\u0161\u00edm odlitk\u016fm s men\u0161\u00edm po\u010dtem vad.<\/p>\n<h3>\u0158\u00edzen\u00ed parametr\u016f procesu<\/h3>\n<p>Nastavte spr\u00e1vnou teplotu kovu i formy. P\u0159i p\u0159\u00edli\u0161 vysok\u00e9 teplot\u011b se plyny rozp\u00ednaj\u00ed; p\u0159i p\u0159\u00edli\u0161 n\u00edzk\u00e9 kov ztuhne d\u0159\u00edve, ne\u017e plyny uniknou.<\/p>\n<p>B\u011bhem tuhnut\u00ed udr\u017eujte stabiln\u00ed dotlak. Pom\u00e1h\u00e1 p\u0159edch\u00e1zet smr\u0161\u0165ovac\u00ed p\u00f3rovitosti t\u00edm, \u017ee dopl\u0148uje kov do m\u00edst, kde by jinak mohly vzniknout dutiny.<\/p>\n<p>Sledujte dobu cyklu a rychlost chlazen\u00ed. Spr\u00e1vn\u00e9 chlazen\u00ed poskytne plyn\u016fm \u010das uniknout, ne\u017e kov zcela ztuhne.<\/p>\n<h2>Detekce a m\u011b\u0159en\u00ed p\u00f3rovitosti<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-704\" src=\"https:\/\/moldiecasting.com\/wp-content\/uploads\/2025\/03\/Die-Casting-Porosity-3.jpg\" alt=\"\" width=\"800\" height=\"450\" srcset=\"https:\/\/moldiecasting.com\/wp-content\/uploads\/2025\/03\/Die-Casting-Porosity-3.jpg 800w, https:\/\/moldiecasting.com\/wp-content\/uploads\/2025\/03\/Die-Casting-Porosity-3-300x169.jpg 300w, https:\/\/moldiecasting.com\/wp-content\/uploads\/2025\/03\/Die-Casting-Porosity-3-768x432.jpg 768w, https:\/\/moldiecasting.com\/wp-content\/uploads\/2025\/03\/Die-Casting-Porosity-3-18x10.jpg 18w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>Ke zji\u0161t\u011bn\u00ed skryt\u00fdch dutin lze pou\u017e\u00edt r\u016fzn\u00e9 metody od jednoduch\u00e9 vizu\u00e1ln\u00ed kontroly po pokro\u010dil\u00e9 zobrazovac\u00ed technologie.<\/p>\n<h3>Nedestruktivn\u00ed zku\u0161ebn\u00ed metody<\/h3>\n<p>Rentgenov\u00e1 kontrola je jedn\u00edm z nejb\u011b\u017en\u011bj\u0161\u00edch zp\u016fsob\u016f, jak odhalit p\u00f3rovitost bez po\u0161kozen\u00ed d\u00edlu. Na sn\u00edmc\u00edch se vnit\u0159n\u00ed dutiny zobrazuj\u00ed jako tmav\u0161\u00ed m\u00edsta na pozad\u00ed kovu.<\/p>\n<p><em>M\u016f\u017eete rychle prov\u011b\u0159it v\u00edce d\u00edl\u016f a odhalit probl\u00e9my, ani\u017e byste museli n\u011bkter\u00fd roz\u0159ezat.<\/em><\/p>\n<p>CT skenov\u00e1n\u00ed (po\u010d\u00edta\u010dov\u00e1 tomografie) poskytuje podrobn\u011bj\u0161\u00ed trojrozm\u011brn\u00fd pohled na vnit\u0159n\u00ed strukturu. Tato pokro\u010dil\u00e1 metoda p\u0159esn\u011b uk\u00e1\u017ee, kde se p\u00f3rovitost v d\u00edlu nach\u00e1z\u00ed, a umo\u017en\u00ed zm\u011b\u0159it jej\u00ed objem.<\/p>\n<p><em>CT skenov\u00e1n\u00ed je zvl\u00e1\u0161\u0165 u\u017eite\u010dn\u00e9 u slo\u017eit\u00fdch d\u00edl\u016f, u nich\u017e z\u00e1le\u017e\u00ed na um\u00edst\u011bn\u00ed p\u00f3rovitosti.<\/em><\/p>\n<p>Ultrazvukov\u00e1 kontrola vyu\u017e\u00edv\u00e1 zvukov\u00e9 vlny k detekci nespojitost\u00ed uvnit\u0159 kovov\u00fdch d\u00edl\u016f. Kdy\u017e vlna naraz\u00ed na dutinu, odraz\u00ed se jin\u00fdm zp\u016fsobem.<\/p>\n<p><em>Tato metoda dob\u0159e odhaluje v\u011bt\u0161\u00ed shluky p\u00f3r\u016f.<\/em><\/p>\n<h3>Kvantitativn\u00ed hodnocen\u00ed p\u00f3rovitosti<\/h3>\n<p>M\u011b\u0159en\u00ed m\u00edry p\u00f3rovitosti pom\u00e1h\u00e1 ur\u010dit, zda d\u00edl spl\u0148uje normy kvality. Archim\u00e9dova metoda porovn\u00e1v\u00e1 hmotnost d\u00edlu na vzduchu a v kapalin\u011b a vypo\u010d\u00edt\u00e1 rozd\u00edly v hustot\u011b zp\u016fsoben\u00e9 vnit\u0159n\u00edmi dutinami.<\/p>\n<p><em>Tento jednoduch\u00fd postup stanov\u00ed celkov\u00e9 procento p\u00f3rovitosti.<\/em><\/p>\n<p>Metalografie zahrnuje od\u0159\u00edznut\u00ed vzorku, vyle\u0161t\u011bn\u00ed povrchu a jeho prohl\u00e9dnut\u00ed pod mikroskopem. Na \u0159ezu lze zm\u011b\u0159it velikost a rozlo\u017een\u00ed p\u00f3r\u016f.<\/p>\n<p><em>Tato metoda poskytuje podrobn\u00e9 informace o konkr\u00e9tn\u00edch oblastech, vy\u017eaduje v\u0161ak zni\u010den\u00ed vzorku.<\/em><\/p>\n<p>Software pro anal\u00fdzu obrazu dok\u00e1\u017ee z rentgenov\u00fdch nebo CT sn\u00edmk\u016f kvantifikovat p\u00f3rovitost. Automaticky vypo\u010d\u00edt\u00e1 procento dutin, jejich velikost i rozlo\u017een\u00ed.<\/p>\n<h2>\u0158e\u0161en\u00ed probl\u00e9m\u016f s p\u00f3rovitost\u00ed<\/h2>\n<h3>N\u00e1prava p\u00f3rovit\u00fdch odlitk\u016f<\/h3>\n<p>Odlitky prohl\u00e9dn\u011bte p\u0159i zv\u011bt\u0161en\u00ed 5\u201310\u00d7, abyste p\u00f3rovitost spr\u00e1vn\u011b identifikovali. Zjist\u00edte tak, zda jde o plynovou p\u00f3rovitost (kulat\u00e9 bubliny), nebo smr\u0161\u0165ovac\u00ed p\u00f3rovitost (nepravideln\u00e9 dutiny).<\/p>\n<p>U m\u00edrn\u00e9 p\u00f3rovitosti je \u00fa\u010dinn\u00e1 impregnace. P\u0159i tomto procesu se dutiny vypln\u00ed t\u011bsnic\u00edm prost\u0159edkem a d\u00edl za\u010dne odol\u00e1vat tlaku. B\u011b\u017en\u011b se pou\u017e\u00edv\u00e1 u sou\u010d\u00e1st\u00ed, kter\u00e9 mus\u00ed zadr\u017eovat kapaliny nebo plyny.<\/p>\n<p>Vnit\u0159n\u00ed p\u00f3rovitost lze \u0159e\u0161it tak\u00e9 n\u00e1sledn\u00fdmi operacemi, nap\u0159\u00edklad izostatick\u00fdm lisov\u00e1n\u00edm za tepla (HIP). Tento proces vyu\u017e\u00edv\u00e1 vysok\u00fd tlak a teplotu ke stla\u010den\u00ed a odstran\u011bn\u00ed vnit\u0159n\u00edch dutin.<\/p>\n<h2>Pro sv\u016fj dal\u0161\u00ed projekt zvolte Moldiecasting<\/h2>\n<p>\u0158e\u0161\u00edte p\u00f3rovitost u tlakov\u011b lit\u00fdch sou\u010d\u00e1st\u00ed? Plynov\u00e1 a smr\u0161\u0165ovac\u00ed p\u00f3rovitost i dutiny zp\u016fsoben\u00e9 zachycen\u00fdm vzduchem nebo nerovnom\u011brn\u00fdm tuhnut\u00edm mohou naru\u0161it struktur\u00e1ln\u00ed celistvost odlitk\u016f, zhor\u0161it jejich mechanick\u00e9 vlastnosti a zv\u00fd\u0161it riziko koroze. Ve spole\u010dnosti <a href=\"https:\/\/moldiecasting.com\/cs\/\">Moldiecasting<\/a> se specializujeme na pokro\u010dil\u00e1 \u0159e\u0161en\u00ed proces\u016f tlakov\u00e9ho lit\u00ed, kter\u00e1 pom\u00e1haj\u00ed p\u00f3rovitost kontrolovat a dosahovat bezvadn\u00fdch v\u00fdsledk\u016f.<\/p>\n<p>Na\u0161e zku\u0161enosti s optimalizac\u00ed toku roztaven\u00e9ho kovu, vysokotlak\u00e9ho vst\u0159ikov\u00e1n\u00ed a p\u0159esn\u00fdch parametr\u016f stroje pom\u00e1haj\u00ed minimalizovat smr\u0161\u0165ovac\u00ed p\u00f3rovitost a odstra\u0148ovat vzduch zachycen\u00fd p\u0159i lit\u00ed. P\u0159\u00ed\u010diny p\u00f3rovitosti \u0159e\u0161\u00edme v ka\u017ed\u00e9 f\u00e1zi \u00fapravou tlou\u0161\u0165ky st\u011bn, v\u00fdb\u011brem slitiny (v\u010detn\u011b zinku a ho\u0159\u010d\u00edku) a \u0159\u00edzen\u00edm tuhnut\u00ed. Pro kritick\u00e9 aplikace nab\u00edz\u00edme vakuovou impregnaci nebo p\u0159etlakov\u00e9 techniky k ut\u011bsn\u011bn\u00ed p\u00f3r\u016f a zv\u00fd\u0161en\u00ed odolnosti, a to i po obr\u00e1b\u011bn\u00ed.<\/p>\n<p>Pro\u010d se spokojit s <a href=\"https:\/\/moldiecasting.com\/cs\/blog\/die-casting-defects-and-solutions\/\">vadami<\/a>? Sta\u0148te se na\u0161\u00edm partnerem a vyu\u017eijte kvalitn\u00ed a n\u00e1kladov\u011b efektivn\u00ed odl\u00e9v\u00e1n\u00ed kov\u016f s d\u016frazem na kontrolu kvality a maxim\u00e1ln\u00ed v\u00fdkon d\u00edl\u016f. Kontaktujte n\u00e1s na adrese <a href=\"https:\/\/moldiecasting.com\/cs\/\" target=\"_blank\" rel=\"noopener noreferrer\">moldiecasting<\/a> a probereme, jak m\u016f\u017ee impregnace dodat va\u0161emu p\u0159\u00ed\u0161t\u00edmu projektu jistotu a zajistit, \u017ee ka\u017ed\u00fd odlitek spln\u00ed nejvy\u0161\u0161\u00ed po\u017eadavky na p\u0159esnost a spolehlivost. Prom\u011b\u0148me probl\u00e9my s p\u00f3rovitost\u00ed v dokonalej\u0161\u00ed \u0159e\u0161en\u00ed!<\/p>\n<h2>\u010casto kladen\u00e9 ot\u00e1zky<\/h2>\n<h3>Jak\u00e9 typy p\u00f3rovitosti se b\u011b\u017en\u011b vyskytuj\u00ed v kovov\u00fdch odlitc\u00edch?<\/h3>\n<p>U tlakov\u00fdch odlitk\u016f se obvykle setk\u00e1v\u00e1me se t\u0159emi hlavn\u00edmi typy p\u00f3rovitosti. Plynov\u00e1 p\u00f3rovitost vznik\u00e1, kdy\u017e se b\u011bhem tuhnut\u00ed v kovu zachyt\u00ed plyny a vytvo\u0159\u00ed mal\u00e9 kulat\u00e9 dutiny.<\/p>\n<p>Smr\u0161\u0165ovac\u00ed p\u00f3rovitost vznik\u00e1 p\u0159i nerovnom\u011brn\u00e9m chladnut\u00ed kovu. P\u0159i smr\u0161\u0165ov\u00e1n\u00ed se v siln\u011bj\u0161\u00edch \u010d\u00e1stech vytvo\u0159\u00ed dutiny nepravideln\u00e9ho tvaru.<\/p>\n<p>Mezidendritick\u00e1 p\u00f3rovitost se objevuje mezi dendritick\u00fdmi strukturami p\u0159i krystalizaci kovu, \u010dasto v m\u00edstech s pomalej\u0161\u00edm chlazen\u00edm.<\/p>\n<h3>Jak\u00e9 \u00farovn\u011b p\u00f3rovitosti pro odlitky stanovuje norma ASTM E505?<\/h3>\n<p>Norma ASTM E505 pou\u017e\u00edv\u00e1 referen\u010dn\u00ed rentgenov\u00e9 sn\u00edmky a klasifikuje p\u00f3rovitost na stupnici od 1 do 7. \u00darove\u0148 1 ozna\u010duje minim\u00e1ln\u00ed p\u00f3rovitost, zat\u00edmco \u00farove\u0148 7 znamen\u00e1 z\u00e1va\u017enou p\u00f3rovitost.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tlakov\u00e9 lit\u00ed je proces tv\u00e1\u0159en\u00ed kov\u016f, p\u0159i n\u011bm\u017e se vst\u0159ikov\u00e1n\u00edm roztaven\u00e9ho kovu do opakovan\u011b pou\u017eiteln\u00fdch forem vyr\u00e1b\u011bj\u00ed p\u0159esn\u00e9 d\u00edly s jemn\u00fdmi detaily. Nab\u00edz\u00ed vynikaj\u00edc\u00ed rozm\u011brovou p\u0159esnost, hladk\u00fd povrch a slo\u017eit\u00e9 tvary, kter\u00fdch by bylo jin\u00fdmi metodami obt\u00ed\u017en\u00e9 dos\u00e1hnout. Tlakov\u00e9 lit\u00ed za\u010d\u00edn\u00e1 p\u0159\u00edpravou ocelov\u00e9 formy. Ta se skl\u00e1d\u00e1 ze dvou polovin, kter\u00e9 se spoj\u00ed a vytvo\u0159\u00ed [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":24113,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_titles_title":"P\u00f3rovitost p\u0159i tlakov\u00e9m lit\u00ed: p\u0159\u00ed\u010diny a \u0159e\u0161en\u00ed \u2013 Moldiecasting","_seopress_titles_desc":"Poznejte p\u00f3rovitost p\u0159i tlakov\u00e9m lit\u00ed, jej\u00ed p\u0159\u00ed\u010diny a \u0159e\u0161en\u00ed, jako je vakuov\u00e1 impregnace a tlakov\u00e9 lit\u00ed, kter\u00e1 zlep\u0161uj\u00ed kvalitu a spolehlivost odlitk\u016f.","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"none","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"both","_seopress_redirections_param":"","_seopress_redirections_type":301,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[],"iawp_total_views":2006,"footnotes":""},"categories":[219],"tags":[],"class_list":["post-23493","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/moldiecasting.com\/cs\/wp-json\/wp\/v2\/posts\/23493","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/moldiecasting.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/moldiecasting.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/moldiecasting.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/moldiecasting.com\/cs\/wp-json\/wp\/v2\/comments?post=23493"}],"version-history":[{"count":4,"href":"https:\/\/moldiecasting.com\/cs\/wp-json\/wp\/v2\/posts\/23493\/revisions"}],"predecessor-version":[{"id":26435,"href":"https:\/\/moldiecasting.com\/cs\/wp-json\/wp\/v2\/posts\/23493\/revisions\/26435"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/moldiecasting.com\/cs\/wp-json\/wp\/v2\/media\/24113"}],"wp:attachment":[{"href":"https:\/\/moldiecasting.com\/cs\/wp-json\/wp\/v2\/media?parent=23493"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/moldiecasting.com\/cs\/wp-json\/wp\/v2\/categories?post=23493"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/moldiecasting.com\/cs\/wp-json\/wp\/v2\/tags?post=23493"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}