{"id":23758,"date":"2026-03-20T16:07:07","date_gmt":"2026-03-20T08:07:07","guid":{"rendered":"https:\/\/moldiecasting.com\/?p=23758"},"modified":"2026-10-09T02:23:31","modified_gmt":"2026-10-08T18:23:31","slug":"permanent-mold-casting-vs-die-casting-what-are-the-differences","status":"publish","type":"post","link":"https:\/\/moldiecasting.com\/cs\/blog\/permanent-mold-casting-vs-die-casting-what-are-the-differences\/","title":{"rendered":"Gravita\u010dn\u00ed lit\u00ed do trval\u00e9 formy vs. tlakov\u00e9 lit\u00ed: jak\u00e9 jsou rozd\u00edly?"},"content":{"rendered":"

V\u00fdrobci \u010dasto porovn\u00e1vaj\u00ed gravita\u010dn\u00ed lit\u00ed do trval\u00e9 formy a tlakov\u00e9 lit\u00ed<\/a><\/span> p\u0159i v\u00fdrob\u011b pevn\u00fdch a p\u0159esn\u00fdch kovov\u00fdch d\u00edl\u016f. Oba procesy vyu\u017e\u00edvaj\u00ed opakovan\u011b pou\u017eiteln\u00e9 kovov\u00e9 formy, ale pln\u00ed je velmi odli\u0161n\u00fdm zp\u016fsobem. Pr\u00e1v\u011b tento rozd\u00edl ovliv\u0148uje n\u00e1klady, rychlost, povrchovou \u00fapravu i pevnost d\u00edlu.<\/p>\n

Tlakov\u00e9 lit\u00ed a gravita\u010dn\u00ed lit\u00ed do trval\u00e9 formy: z\u00e1sadn\u00ed rozd\u00edly<\/h2>\n

Gravita\u010dn\u00ed lit\u00ed do trval\u00e9 formy i tlakov\u00e9 lit\u00ed vyu\u017e\u00edvaj\u00ed opakovan\u011b pou\u017eiteln\u00e9 formy, ale v\u00fdrazn\u011b se li\u0161\u00ed jejich konstrukce i zp\u016fsob, jak\u00fdm se roztaven\u00fd kov dost\u00e1v\u00e1 do dutiny.<\/p>\n

\"p\u00edstov\u00fd<\/p>\n

Zp\u016fsob pln\u011bn\u00ed a p\u0159ehled proces\u016f<\/h3>\n

P\u0159i gravita\u010dn\u00edm lit\u00ed do trval\u00e9 formy se kov pln\u00ed gravitac\u00ed. Obsluha nalije roztaven\u00fd kov do p\u0159edeh\u0159\u00e1t\u00e9 kovov\u00e9 formy a gravitace jej st\u00e1hne do dutiny. Po ochlazen\u00ed a ztuhnut\u00ed kovu pracovn\u00edci formu otev\u0159ou a d\u00edl vyjmou. V\u00fdroba obvykle dosahuje p\u0159ibli\u017en\u011b 5 a\u017e 50 odlitk\u016f za hodinu podle velikosti d\u00edlu.<\/p>\n

Tlakov\u00e9 lit\u00ed funguje jinak. Roztaven\u00fd kov se vst\u0159ikuje do formy pod vysok\u00fdm tlakem, \u010dasto p\u0159es 100 bar, co\u017e zaji\u0161\u0165uje vysokou \u00fa\u010dinnost. N\u011bkter\u00e9 syst\u00e9my tlakov\u00e9ho lit\u00ed vyrob\u00ed a\u017e 200 d\u00edl\u016f za hodinu, a podporuj\u00ed tak velk\u00e9 v\u00fdrobn\u00ed s\u00e9rie.<\/p>\n

Oba procesy pou\u017e\u00edvaj\u00ed kovov\u00e9 formy, ale zp\u016fsob jejich pln\u011bn\u00ed a pracovn\u00ed cyklus ur\u010duj\u00ed z\u00e1klad v\u0161ech dal\u0161\u00edch rozd\u00edl\u016f.<\/p>\n

Konstrukce opakovan\u011b pou\u017eiteln\u00fdch forem<\/h3>\n

Oba procesy se spol\u00e9haj\u00ed na opakovan\u011b pou\u017eiteln\u00e9 formy, jejich materi\u00e1ly a konstrukce se v\u0161ak li\u0161\u00ed.<\/p>\n

P\u0159i gravita\u010dn\u00edm lit\u00ed do trval\u00e9 formy v\u00fdrobci \u010dasto zhotovuj\u00ed kovov\u00e9 formy z litiny, grafitu nebo n\u00e1strojov\u00e9 oceli. Formy mus\u00ed odol\u00e1vat opakovan\u00e9mu oh\u0159\u00edv\u00e1n\u00ed a chlazen\u00ed, ale nemusej\u00ed sn\u00e1\u0161et extr\u00e9mn\u00ed vst\u0159ikovac\u00ed tlak.\u00a0V n\u011bkter\u00fdch p\u0159\u00edpadech se pou\u017e\u00edvaj\u00ed tak\u00e9 p\u00edskov\u00e1 j\u00e1dra.<\/p>\n

Naproti tomu tlakov\u00e9 lit\u00ed vyu\u017e\u00edv\u00e1 kalen\u00e9 a popou\u0161t\u011bn\u00e9 formy ze slitinov\u00e9 oceli, kter\u00e9 mus\u00ed odol\u00e1vat vysok\u00e9mu vst\u0159ikovac\u00edmu tlaku a opakovan\u00fdm up\u00ednac\u00edm sil\u00e1m. Pro mechanick\u00fd pohyb forma \u010dasto obsahuje posuvn\u00edky a vyhazovac\u00ed kol\u00edky. Tato konstrukce umo\u017e\u0148uje rychl\u00e9 vyjmut\u00ed tlakov\u00e9ho odlitku a podporuje v\u00fdrobu tenk\u00fdch st\u011bn a d\u00edl\u016f s \u00fazk\u00fdmi tolerancemi.<\/p>\n

N\u00e1stroje pro tlakov\u00e9 lit\u00ed obvykle stoj\u00ed v\u00edce, proto\u017ee mus\u00ed odol\u00e1vat vy\u0161\u0161\u00edmu nam\u00e1h\u00e1n\u00ed a zaji\u0161\u0165ovat p\u0159esn\u011bj\u0161\u00ed v\u00fdrobu.<\/p>\n

Pou\u017e\u00edvan\u00e9 materi\u00e1ly a slitiny<\/h2>\n

Volba materi\u00e1lu ovliv\u0148uje pevnost, hmotnost, odolnost proti korozi a n\u00e1klady u obou proces\u016f. V\u011bt\u0161ina d\u00edl\u016f se vyr\u00e1b\u00ed z ne\u017eelezn\u00fdch kov\u016f, ka\u017ed\u00fd proces v\u0161ak up\u0159ednost\u0148uje ur\u010dit\u00e9 slitiny podle zp\u016fsobu, jak\u00fdm kov ve form\u011b te\u010de a chladne.<\/p>\n

B\u011b\u017en\u00e9 kovy pro gravita\u010dn\u00ed lit\u00ed do trval\u00e9 formy<\/h3>\n

P\u0159i gravita\u010dn\u00edm lit\u00ed do trval\u00e9 formy se \u010dasto pou\u017e\u00edv\u00e1 ho\u0159\u010d\u00edk, n\u011bkter\u00e9 slitiny m\u011bdi a hlin\u00edkov\u00e9 slitiny<\/a><\/span>, zejm\u00e9na A356 a dal\u0161\u00ed slitiny \u0159ady 300. Tyto slitiny dob\u0159e te\u010dou p\u0159i pln\u011bn\u00ed gravitac\u00ed a po tepeln\u00e9m zpracov\u00e1n\u00ed dosahuj\u00ed dobr\u00e9 pevnosti.<\/p>\n

V n\u011bkter\u00fdch p\u0159\u00edpadech v\u00fdrobci pou\u017e\u00edvaj\u00ed v trval\u00fdch form\u00e1ch tak\u00e9 litinu, i kdy\u017e je to m\u00e9n\u011b b\u011b\u017en\u00e9 ne\u017e hlin\u00edk. Proces je vhodn\u00fd pro st\u0159edn\u00ed objemy v\u00fdroby a podporuje d\u00edly, u nich\u017e je \u017e\u00e1douc\u00ed ni\u017e\u0161\u00ed vnit\u0159n\u00ed p\u00f3rovitost.<\/p>\n

Up\u0159ednost\u0148ovan\u00e9 slitiny pro tlakov\u00e9 lit\u00ed<\/h3>\n

Tlakov\u00e9 lit\u00ed vyu\u017e\u00edv\u00e1 slitiny vhodn\u00e9 pro vst\u0159ikov\u00e1n\u00ed pod vysok\u00fdm tlakem. Nej\u010dast\u011bji se pou\u017e\u00edv\u00e1 zinkov\u00e1 slitina, nap\u0159\u00edklad Zamak, a hlin\u00edkov\u00e1 slitina A380, kter\u00e9 se vyzna\u010duj\u00ed dobrou tekutost\u00ed a rozm\u011brovou stabilitou. V\u00fdrobci \u010dasto pou\u017e\u00edvaj\u00ed tak\u00e9 ho\u0159\u010d\u00edkov\u00e9 slitiny<\/a><\/span> p\u0159i tlakov\u00e9m lit\u00ed, proto\u017ee maj\u00ed n\u00edzkou hmotnost a dobrou pevnost.<\/p>\n

\u017delezo se p\u0159i tlakov\u00e9m lit\u00ed pou\u017e\u00edv\u00e1 jen z\u0159\u00eddka, proto\u017ee vysok\u00e9 teploty taven\u00ed by po\u0161kodily ocelov\u00e9 formy a zv\u00fd\u0161ily n\u00e1klady. Proces je nejvhodn\u011bj\u0161\u00ed pro ne\u017eelezn\u00e9 kovy s ni\u017e\u0161\u00ed teplotou taven\u00ed a dobrou sl\u00e9vatelnost\u00ed.<\/p>\n

Hlin\u00edk z\u016fst\u00e1v\u00e1 nejb\u011b\u017en\u011bj\u0161\u00ed volbou pro oba procesy, ale zinek, ho\u0159\u010d\u00edk, slitiny m\u011bdi a omezen\u00e9 pou\u017eit\u00ed \u017eeleza slou\u017e\u00ed konkr\u00e9tn\u00edm konstruk\u010dn\u00edm c\u00edl\u016fm.<\/p>\n

Povrchov\u00e1 \u00faprava a rozm\u011brov\u00e1 p\u0159esnost<\/h2>\n

Povrchov\u00e1 \u00faprava a rozm\u011brov\u00e1 p\u0159esnost \u010dasto rozhoduj\u00ed p\u0159i v\u00fdb\u011bru mezi gravita\u010dn\u00edm lit\u00edm do trval\u00e9 formy a tlakov\u00fdm lit\u00edm. Ka\u017ed\u00fd proces dosahuje jin\u00e9 \u00farovn\u011b povrchov\u00e9 \u00fapravy po odlit\u00ed<\/a><\/span>, \u00fazk\u00fdch toleranc\u00ed a pot\u0159eby n\u00e1sledn\u00e9ho obr\u00e1b\u011bn\u00ed.<\/p>\n

Tolerance a geometrick\u00e1 p\u0159esnost<\/h3>\n

Oba procesy vyu\u017e\u00edvaj\u00ed kovov\u00e9 formy, a proto vytv\u00e1\u0159ej\u00ed hlad\u0161\u00ed povrch ne\u017e lit\u00ed do p\u00edsku. Pevn\u00e9 st\u011bny formy omezuj\u00ed drsnost povrchu a vytv\u00e1\u0159ej\u00ed \u010dist\u0161\u00ed hrany.<\/p>\n

Gravita\u010dn\u00ed lit\u00ed do trval\u00e9 formy m\u016f\u017ee dosahovat dobr\u00fdch rozm\u011brov\u00fdch toleranc\u00ed a zajistit dobr\u00e9 l\u00edcov\u00e1n\u00ed v d\u011bl\u00edc\u00ed rovin\u011b, dutinu v\u0161ak nepln\u00ed silou.\u00a0Tlakov\u00e9 lit\u00ed naopak dosahuje vysok\u00e9 rozm\u011brov\u00e9 p\u0159esnosti, proto\u017ee tlak vtla\u010duje kov do v\u0161ech \u010d\u00e1st\u00ed dutiny.<\/p>\n

Po\u017eadavky na n\u00e1sledn\u00e9 obr\u00e1b\u011bn\u00ed<\/h3>\n

Gravita\u010dn\u00ed odlitky \u010dasto vy\u017eaduj\u00ed lehk\u00e9 obr\u00e1b\u011bn\u00ed kritick\u00fdch ploch. Obr\u00e1b\u011bj\u00ed se nap\u0159\u00edklad ulo\u017een\u00ed lo\u017eisek, t\u011bsnic\u00ed plochy nebo z\u00e1vitov\u00e9 oblasti, aby spl\u0148ovaly \u00fazk\u00e9 tolerance. I tak obvykle vy\u017eaduj\u00ed m\u00e9n\u011b obr\u00e1b\u011bn\u00ed ne\u017e odlitky z p\u00edsku.<\/p>\n

Tlakov\u00e9 lit\u00ed m\u016f\u017ee d\u00edky vysok\u00e9 p\u0159esnosti a hladk\u00e9mu povrchu omezit obr\u00e1b\u011bn\u00ed nekritick\u00fdch ploch a mnoho d\u00edl\u016f opou\u0161t\u00ed formu p\u0159ipraven\u00fdch k mont\u00e1\u017ei.<\/p>\n

I u obou proces\u016f v\u0161ak \u010dasto vy\u017eaduj\u00ed n\u00e1sledn\u00e9 obr\u00e1b\u011bn\u00ed dal\u0161\u00ed prvky, nap\u0159\u00edklad p\u0159esn\u00e9 otvory nebo t\u011bsnic\u00ed plochy.<\/p>\n

Mechanick\u00e9 vlastnosti a kvalita odlitk\u016f<\/h2>\n

Mechanick\u00e9 vlastnosti z\u00e1vis\u00ed na tom, jak kov ve form\u011b te\u010de a chladne. Pevnost, \u00farove\u0148 p\u00f3rovitosti a schopnost vytv\u00e1\u0159et slo\u017eit\u00e9 tvary ovliv\u0148uj\u00ed chov\u00e1n\u00ed hotov\u00e9ho d\u00edlu v provozu.<\/p>\n

\"sch\u00e9ma<\/p>\n

Konstruk\u010dn\u00ed pevnost a p\u00f3rovitost<\/h3>\n

Gravita\u010dn\u00ed lit\u00ed do trval\u00e9 formy \u010dasto vytv\u00e1\u0159\u00ed d\u00edly s dobrou a\u017e vysokou pevnost\u00ed. Pln\u011bn\u00ed gravitac\u00ed zaji\u0161\u0165uje plynul\u00fd tok kovu a \u0159\u00edzen\u00e9 chlazen\u00ed v kovov\u00e9 form\u011b zlep\u0161uje strukturu zrn. Ve srovn\u00e1n\u00ed s mnoha metodami lit\u00ed do p\u00edsku m\u016f\u017ee tento proces omezit sta\u017eeniny.<\/p>\n

P\u00f3rovitost b\u00fdv\u00e1 st\u0159edn\u00ed a\u017e n\u00edzk\u00e1, ale v siln\u00fdch pr\u016f\u0159ezech se m\u016f\u017ee zachytit plyn, pokud je odvzdu\u0161n\u011bn\u00ed nedostate\u010dn\u00e9. Spr\u00e1vn\u00e1 konstrukce vtokov\u00e9 soustavy a formy z\u016fst\u00e1v\u00e1 z\u00e1sadn\u00ed.<\/p>\n

Tlakov\u00e9 lit\u00ed vyu\u017e\u00edv\u00e1 vysokou vst\u0159ikovac\u00ed s\u00edlu, \u010dasto p\u0159es 100 bar. Tlak pom\u00e1h\u00e1 vyplnit tenk\u00e9 st\u011bny a drobn\u00e9 detaily a u mal\u00fdch d\u00edl\u016f m\u016f\u017ee omezit povrchov\u00e9 dutiny.<\/p>\n

Tlakov\u00e9 lit\u00ed v\u0161ak m\u016f\u017ee m\u00edt probl\u00e9my s p\u00f3rovitost\u00ed<\/a><\/span>, zejm\u00e9na v siln\u011bj\u0161\u00edch \u010d\u00e1stech. Zachycen\u00fd vzduch a rychl\u00e9 pln\u011bn\u00ed mohou vytv\u00e1\u0159et vnit\u0159n\u00ed plynov\u00e9 dutiny. Tyto dutiny mohou sn\u00ed\u017eit ta\u017enost a \u00fanosnost konstruk\u010dn\u00edch d\u00edl\u016f.<\/p>\n

Slo\u017eit\u00e9 geometrie a vnit\u0159n\u00ed prvky<\/h3>\n

Gravita\u010dn\u00ed lit\u00ed do trval\u00e9 formy umo\u017e\u0148uje vytv\u00e1\u0159et slo\u017eit\u00e9 geometrie p\u0159i pou\u017eit\u00ed p\u00edskov\u00fdch nebo kovov\u00fdch jader. Polotrval\u00e1 forma umo\u017e\u0148uje v\u00fdrobu vnit\u0159n\u00edch galeri\u00ed, kan\u00e1l\u016f a dut\u00fdch \u010d\u00e1st\u00ed, kter\u00e9 se p\u0159i tlakov\u00e9m lit\u00ed vytv\u00e1\u0159ej\u00ed obt\u00ed\u017en\u011b.<\/p>\n

Tato flexibilita je v\u00fdhodn\u00e1 nap\u0159\u00edklad u sk\u0159\u00edn\u00ed s vnit\u0159n\u00edmi kan\u00e1ly. Podporuje tak\u00e9 siln\u011bj\u0161\u00ed pr\u016f\u0159ezy bez nutnosti extr\u00e9mn\u00edho tlaku.<\/p>\n

Tlakov\u00e9 lit\u00ed vynik\u00e1 p\u0159i v\u00fdrob\u011b tenk\u00fdch st\u011bn a ostr\u00fdch detail\u016f. Vysok\u00fd tlak vtla\u010duje kov do \u00fazk\u00fdch dutin a umo\u017e\u0148uje slo\u017eit\u00e9 vn\u011bj\u0161\u00ed tvary a mal\u00e9 polom\u011bry.<\/p>\n

Pohybliv\u00e1 j\u00e1dra umo\u017e\u0148uj\u00ed vytvo\u0159it n\u011bkter\u00e9 vnit\u0159n\u00ed prvky, velmi slo\u017eit\u00e9 vnit\u0159n\u00ed kan\u00e1ly v\u0161ak mohou zvy\u0161ovat n\u00e1klady na n\u00e1stroje a omezovat konstruk\u010dn\u00ed mo\u017enosti. P\u0159i v\u00fdb\u011bru procesu mus\u00ed in\u017een\u00fd\u0159i zv\u00e1\u017eit slo\u017eitost tvaru, konstrukci n\u00e1stroj\u016f a o\u010dek\u00e1van\u00e9 mechanick\u00e9 vlastnosti.<\/p>\n

N\u00e1stroje, objem v\u00fdroby a ekonomick\u00e9 hledisko<\/h2>\n

Konstrukce n\u00e1stroj\u016f, o\u010dek\u00e1van\u00fd objem v\u00fdroby a doba cyklu ur\u010duj\u00ed n\u00e1kladovou strukturu obou proces\u016f. Gravita\u010dn\u00ed lit\u00ed do trval\u00e9 formy i tlakov\u00e9 lit\u00ed pou\u017e\u00edvaj\u00ed ocelov\u00e9 formy<\/a><\/span>, li\u0161\u00ed se v\u0161ak v n\u00e1kladech na n\u00e1stroje<\/a><\/span>, \u017eivotnosti a rozsahu velkoobjemov\u00e9 v\u00fdroby, kterou podporuj\u00ed.<\/p>\n

\"pracovn\u00edk<\/p>\n

N\u00e1klady na n\u00e1stroje a objem v\u00fdroby<\/h3>\n

Gravita\u010dn\u00ed lit\u00ed do trval\u00e9 formy vyu\u017e\u00edv\u00e1 opakovan\u011b pou\u017eiteln\u00e9 ocelov\u00e9 formy pln\u011bn\u00e9 gravitac\u00ed, co\u017e udr\u017euje n\u00e1klady na n\u00e1stroje na st\u0159edn\u00ed \u00farovni.\u00a0Formy jsou odoln\u00e9, ale v d\u016fsledku teplotn\u00edch cykl\u016f se opot\u0159ebov\u00e1vaj\u00ed rychleji ne\u017e n\u00e1stroje pro vysokotlak\u00e9 lit\u00ed.<\/p>\n

Formy pro tlakov\u00e9 lit\u00ed mus\u00ed b\u00fdt z kalen\u00e9 oceli a navr\u017een\u00e9 tak, aby odol\u00e1valy vysok\u00fdm vst\u0159ikovac\u00edm tlak\u016fm, slo\u017eit\u00fdm chladic\u00edm kan\u00e1l\u016fm a automatick\u00fdm vyhazovac\u00edm syst\u00e9m\u016fm. Tato slo\u017eitost v\u00fdrazn\u011b zvy\u0161uje po\u010d\u00e1te\u010dn\u00ed n\u00e1klady na n\u00e1stroje.<\/p>\n

Odoln\u00e9 formy pro tlakov\u00e9 lit\u00ed jsou v\u0161ak navr\u017eeny pro dlouhou \u017eivotnost a mohou \u00fasp\u011b\u0161n\u011b vyrobit stovky tis\u00edc, nebo dokonce v\u00edce ne\u017e milion d\u00edl\u016f. Proto se tlakov\u00e9 lit\u00ed zam\u011b\u0159uje\u00a0zejm\u00e9na na\u00a0hromadnou v\u00fdrobu ve velk\u00fdch objemech, nap\u0159\u00edklad automobilov\u00fdch d\u00edl\u016f nebo kryt\u016f spot\u0159ebn\u00ed elektroniky.<\/p>\n

Efektivita v\u00fdroby<\/h3>\n

Gravita\u010dn\u00ed lit\u00ed do trval\u00e9 formy vyu\u017e\u00edv\u00e1 k pln\u011bn\u00ed ocelov\u00e9 formy gravitaci nebo \u0159\u00edzen\u00fd n\u00edzk\u00fd tlak. Doba cyklu je stabiln\u00ed, ale del\u0161\u00ed ne\u017e u tlakov\u00e9ho lit\u00ed, proto\u017ee pln\u011bn\u00ed a tuhnut\u00ed trv\u00e1 d\u00e9le.<\/p>\n

Obsluha \u010dasto zaji\u0161\u0165uje v\u00edce ru\u010dn\u00edch krok\u016f, nap\u0159\u00edklad p\u0159edeh\u0159ev formy a kontrolu jej\u00edho povlakov\u00e1n\u00ed. To omezuje rychlost procesu, zejm\u00e9na u siln\u011bj\u0161\u00edch d\u00edl\u016f.<\/p>\n

Tlakov\u00e9 lit\u00ed dosahuje vysok\u00e9 v\u00fdrobn\u00ed rychlosti. Roztaven\u00fd kov se do formy vst\u0159ikuje pod vysok\u00fdm tlakem, rychle vypl\u0148uje tenk\u00e9 st\u011bny a zkracuje dobu tuhnut\u00ed. Automatizovan\u00e9 syst\u00e9my zaji\u0161\u0165uj\u00ed post\u0159ik, uzav\u0159en\u00ed, vst\u0159ikov\u00e1n\u00ed, chlazen\u00ed a vyjmut\u00ed d\u00edlu.<\/p>\n

Jak vybrat spr\u00e1vn\u00fd proces pro v\u00e1\u0161 projekt<\/h2>\n

P\u0159i v\u00fdb\u011bru zp\u016fsobu odl\u00e9v\u00e1n\u00ed mus\u00ed v\u00fdrobci zv\u00e1\u017eit objem v\u00fdroby, slo\u017eitost d\u00edlu, rozpo\u010det na n\u00e1stroje a po\u017eadavky na materi\u00e1l.<\/p>\n

N\u00ed\u017ee uv\u00e1d\u00edme p\u0159\u00edklady pou\u017eit\u00ed t\u011bchto proces\u016f v praxi:<\/p>\n