{"id":3304,"date":"2026-05-14T03:12:24","date_gmt":"2026-05-14T03:12:24","guid":{"rendered":"https:\/\/sprocket-chain.net\/?p=3304"},"modified":"2026-05-14T03:13:04","modified_gmt":"2026-05-14T03:13:04","slug":"cast-iron-vs-steel-sprockets","status":"publish","type":"post","link":"https:\/\/sprocket-chain.net\/sk\/cast-iron-vs-steel-sprockets\/","title":{"rendered":"Liatinov\u00e9 vs. oce\u013eov\u00e9 ozuben\u00e9 koles\u00e1: Technick\u00e9 argumenty pre ka\u017ed\u00e9 z nich \u2013 a kedy je vo\u013eba d\u00f4le\u017eit\u00e1"},"content":{"rendered":"
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Liatina<\/div>\n
Ni\u017e\u0161ie n\u00e1klady.
\nSamotlmenie.
\nKrehk\u00fd.<\/div>\n

Siv\u00e1 a tv\u00e1rna liatina. Trieda AGMA I \/ II. Ide\u00e1lne pre aplik\u00e1cie s n\u00edzkym n\u00e1razom a ve\u013ek\u00fdm objemom v\u00fdroby, kde po\u010diato\u010dn\u00e9 n\u00e1klady ovplyv\u0148uj\u00fa rozhodnutie o k\u00fape.<\/p>\n<\/div>\n<\/div>\n

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Uhl\u00edkov\u00e1 a legovan\u00e1 oce\u013e<\/div>\n
Kalen\u00e9.
\nTv\u00e1rny.
\nVy\u0161\u0161\u00ed \u017eivot.<\/div>\n

1045, 4140, 8620. Tvrdos\u0165 povrchu zuba HRC 55\u201360. Vy\u017eaduje sa pre r\u00e1zov\u00e9 za\u0165a\u017eenia, vysokocyklov\u00e9 pohony a ak\u00e9ko\u013evek aplik\u00e1cie, kde opotrebenie zuba ur\u010duje \u017eivotnos\u0165.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Liatinov\u00e9 vs. oce\u013eov\u00e9 ozuben\u00e9 koles\u00e1: Technick\u00e9 argumenty pre ka\u017ed\u00e9 z nich \u2013 a kedy je vo\u013eba d\u00f4le\u017eit\u00e1<\/h1>\n<\/div>\n
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K\u0155mny z\u00e1vod v provincii Severn\u00fd \u010cchung\u010dchong zak\u00fapil v roku 2022 liatinov\u00e9 ozuben\u00e9 koles\u00e1 na moderniz\u00e1ciu svojho dopravn\u00edka \u2013 boli o model 35% lacnej\u0161ie ako oce\u013eov\u00fd ekvivalent, dod\u00e1vate\u013e potvrdil kompatibilitu s existuj\u00facou re\u0165azou #80 a mana\u017e\u00e9r \u00fadr\u017eby \u00faspe\u0161ne pou\u017eil liatinov\u00e9 ozuben\u00e9 koles\u00e1 na rovnakom type dopravn\u00edka v predch\u00e1dzaj\u00facom zariaden\u00ed. O osemn\u00e1s\u0165 mesiacov nesk\u00f4r mali dve z dvan\u00e1stich poz\u00edci\u00ed pohonu zlomeniny zubov ozuben\u00fdch kolies. Nie opotrebovanie \u2013 zlomeniny. Zlomen\u00e9 zuby sa nach\u00e1dzali v miestach, kde dopravn\u00edk niesol nakladacie rameno kore\u010dkov\u00e9ho elev\u00e1tora \u2013 v mieste, kde re\u0165az dopravn\u00edka za\u017e\u00edva moment\u00e1lny n\u00e1rast nap\u00e4tia pri plnen\u00ed ka\u017edej vedra pri zdvihu smerom nadol. Liatinov\u00e9 zuby sa postupne l\u00e1mali, jeden hrot zuba na jedno naplnenie vedra, a\u017e k\u00fdm nech\u00fdbalo viacero zubov a re\u0165az sa neuvo\u013enila. \u0160pecifik\u00e1cia n\u00e1hrady bola uhl\u00edkov\u00e1 oce\u013e 1045 s cement\u00e1ciou. V nasleduj\u00facich 30 mesiacoch prev\u00e1dzky nedo\u0161lo k \u017eiadnym zlomenin\u00e1m. Po\u010diato\u010dn\u00e1 \u00faspora n\u00e1kladov na liatinov\u00e9 ozuben\u00e9 koles\u00e1 35% st\u00e1la pribli\u017ene osemn\u00e1sobok ich hodnoty na v\u00fdmene a prestojoch po\u010das 18-mesa\u010dn\u00e9ho obdobia.<\/p>\n

Liatinov\u00e9 ozuben\u00e9 koles\u00e1 s\u00fa legit\u00edmnou technickou \u0161pecifik\u00e1ciou pre spr\u00e1vne aplik\u00e1cie. Chybou nie je v\u00fdber liatiny \u2013 je to v\u00fdber liatiny pre aplik\u00e1cie, ktor\u00e9 zah\u0155\u0148aj\u00fa r\u00e1zov\u00e9 za\u0165a\u017eenie, stav, pri ktorom krehk\u00e9 poru\u0161enie liatiny premie\u0148a men\u0161ie pre\u0165a\u017eenie zuba na \u00fapln\u00fd lom zuba, a nie na plastick\u00fa deform\u00e1ciu, ktor\u00e1 by nastala v oceli.<\/p>\n

\"ozuben\u00e9<\/p>\n

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Tri vlastnosti, ktor\u00e9 ur\u010duj\u00fa v\u00fdber materi\u00e1lu ozuben\u00e9ho kolesa<\/h2>\n
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Tvrdos\u0165 \u010dela zuba<\/div>\n
\u2192 riadi \u017eivotnos\u0165<\/div>\n<\/div>\n
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Tvrdos\u0165 \u010dela zuba ur\u010duje, ako r\u00fdchlo sa val\u010dek re\u0165aze opotrebuje do profilu zuba ozuben\u00e9ho kolesa. Tvrd\u0161ia plocha zuba sa opotrebuje pomal\u0161ie pri rovnakom kontaktnom nap\u00e4t\u00ed val\u010deka. Liatina v odliatku m\u00e1 tvrdos\u0165 \u010dela zuba 160 \u2013 220 HB (HRC ~0 \u2013 18). Cementovan\u00e1 oce\u013e dosahuje na povrchu zuba tvrdos\u0165 HRC 55 \u2013 60 (pribli\u017ene 595 \u2013 746 HB). Rozdiel v tvrdosti je pribli\u017ene 4 \u2013 5:1 \u2013 a miera opotrebenia sa pribli\u017ene zvy\u0161uje s druhou mocninou pomeru tvrdosti, \u010do znamen\u00e1, \u017ee zuby z cementovanej ocele sa opotreb\u00favaj\u00fa pribli\u017ene 1\/16 \u2013 1\/25 r\u00fdchlosti opotrebovania liatinov\u00fdch zubov v rovnakom pohone.<\/p>\n

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Siv\u00e1 liatina<\/div>\n
160\u2013220 HB<\/div>\n<\/div>\n
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Cementovan\u00e1 oce\u013e<\/div>\n
HRC 55\u201360<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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N\u00e1razov\u00e1 h\u00fa\u017eevnatos\u0165<\/div>\n
\u2192 riadi odolnos\u0165 vo\u010di n\u00e1razom<\/div>\n<\/div>\n
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Siv\u00e1 liatina m\u00e1 takmer nulov\u00fa vrubov\u00fa r\u00e1zov\u00fa h\u00fa\u017eevnatos\u0165 \u2013 mikro\u0161trukt\u00fara grafitov\u00fdch vlo\u010diek vytv\u00e1ra vn\u00fatorn\u00e9 koncentr\u00e1cie nap\u00e4tia, ktor\u00e9 sa pri r\u00e1zovom za\u0165a\u017een\u00ed \u0161\u00edria ako trhliny. Jedin\u00fd n\u00e1raz zuba nad prah lomovej h\u00fa\u017eevnatosti materi\u00e1lu sp\u00f4sob\u00ed \u00fapln\u00e9 lomenie zuba. Uhl\u00edkov\u00e1 oce\u013e (1045, 4140) m\u00e1 hodnoty r\u00e1zovej h\u00fa\u017eevnatosti 30 \u2013 80 J (Charpy) \u2013 pri rovnakom r\u00e1zovom za\u0165a\u017een\u00ed sa deformuje plasticky, a nie l\u00e1me. Pre r\u00e1zov\u00e9 aplik\u00e1cie je tento rozdiel ur\u010duj\u00faci: prv\u00fd n\u00e1raz, ktor\u00fd pre\u0165a\u017e\u00ed liatinov\u00fd zub, ho zlom\u00ed; rovnak\u00e9 pre\u0165a\u017eenie oce\u013eov\u00e9ho zuba ho mierne deformuje, \u010d\u00edm sa zn\u00ed\u017ei geometria kontaktu, ale funkcia sa zachov\u00e1.<\/p>\n

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Siv\u00e1 liatina<\/div>\n
~2\u20134 J<\/div>\n<\/div>\n
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Oce\u013e 1045<\/div>\n
40 \u2013 80 J<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Tlmenie vibr\u00e1ci\u00ed<\/div>\n
\u2192 reguluje hluk<\/div>\n<\/div>\n
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Siv\u00e1 liatina m\u00e1 v porovnan\u00ed s oce\u013eou lep\u0161ie tlmenie vibr\u00e1ci\u00ed \u2013 mikro\u0161trukt\u00fara grafitov\u00fdch vlo\u010diek, ktor\u00e1 zni\u017euje h\u00fa\u017eevnatos\u0165, z\u00e1rove\u0148 zabezpe\u010duje vn\u00fatorn\u00e9 trenie, ktor\u00e9 rozpty\u013euje energiu vibr\u00e1ci\u00ed. Koeficient tlmenia sivej liatiny je pribli\u017ene 10\u201325-n\u00e1sobok koeficientu uhl\u00edkovej ocele. V aplik\u00e1ci\u00e1ch s vysokor\u00fdchlostn\u00fdmi re\u0165azov\u00fdmi pohonmi, kde je hluk zo z\u00e1beru val\u010dekov probl\u00e9mom (napr. pohony obr\u00e1bac\u00edch strojov, dopravn\u00edky s pr\u00edstrojmi, pohony v bl\u00edzkosti presn\u00fdch merac\u00edch zariaden\u00ed), ozuben\u00e9 koles\u00e1 zo sivej liatiny merate\u013ene zni\u017euj\u00fa pren\u00e1\u0161an\u00e9 vibr\u00e1cie a akustick\u00fd hluk v porovnan\u00ed s oce\u013eov\u00fdmi ekvivalentmi pri rovnakej r\u00fdchlosti re\u0165aze.<\/p>\n

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Siv\u00e1 liatina<\/div>\n
Vysok\u00e9 tlmenie<\/div>\n<\/div>\n
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Uhl\u00edkov\u00e1 oce\u013e<\/div>\n
N\u00edzke tlmenie<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
Protiintuit\u00edvne: vlastnos\u0165, ktor\u00e1 rob\u00ed liatinu zlou vo\u013ebou pre n\u00e1razov\u00e9 aplik\u00e1cie \u2013 jej mikro\u0161trukt\u00fara grafitov\u00fdch vlo\u010diek \u2013 je presne t\u00e1 ist\u00e1 vlastnos\u0165, ktor\u00e1 ju rob\u00ed lep\u0161ou ako oce\u013e pre tlmenie vibr\u00e1ci\u00ed.<\/strong> Grafitov\u00e9 vlo\u010dky p\u00f4sobia ako inici\u00e1tory trhl\u00edn pri n\u00e1razovom za\u0165a\u017een\u00ed a ako tlmi\u010de vibra\u010dnej energie po\u010das ust\u00e1lenej prev\u00e1dzky. Ozuben\u00e9 koleso zo sivej liatiny v hladkom, vysokor\u00fdchlostnom re\u0165azovom pohone s n\u00edzkymi r\u00e1zmi bude tich\u0161ie a pren\u00e1\u0161a menej vibr\u00e1ci\u00ed na susedn\u00e9 kon\u0161trukcie ako oce\u013eov\u00e9 ozuben\u00e9 koleso. To ist\u00e9 ozuben\u00e9 koleso v dopravn\u00edkovej aplik\u00e1cii s ob\u010dasn\u00fdm n\u00e1razov\u00fdm za\u0165a\u017een\u00edm (p\u00e1dy materi\u00e1lu, \u0161ikm\u00e9 \u0161tarty re\u0165aze, udalosti zaseknutia a uvo\u013enenia) sp\u00f4sob\u00ed zlomenie zubov. V\u00fdber materi\u00e1lu ozuben\u00fdch kolies nie je len \u201eoce\u013e je lep\u0161ia ako \u017eelezo\u201c \u2013 vy\u017eaduje si identifik\u00e1ciu, ktor\u00e1 vlastnos\u0165 (odolnos\u0165 proti opotrebeniu, h\u00fa\u017eevnatos\u0165 alebo tlmenie) ur\u010duje konkr\u00e9tnu aplik\u00e1ciu.<\/div>\n

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Kompletn\u00e9 porovnanie materi\u00e1lov: \u0160pecifik\u00e1cie materi\u00e1lov siedmich ozuben\u00fdch kolies<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n
Materi\u00e1l<\/th>\nTvrdos\u0165 zubov<\/th>\nOdolnos\u0165 vo\u010di n\u00e1razom<\/th>\n\u017divotnos\u0165 (relat\u00edvna)<\/th>\nObrobite\u013enos\u0165<\/th>\nCena (relat\u00edvna)<\/th>\nPrim\u00e1rne aplik\u00e1cie<\/th>\n<\/tr>\n<\/thead>\n
Siv\u00e1 liatina (FC200)<\/td>\n160\u2013200 HB<\/td>\nVe\u013emi n\u00edzke<\/td>\n1\u00d7 (referen\u010dn\u00fd)<\/td>\nVynikaj\u00face<\/td>\nNajni\u017e\u0161ia (1,0\u00d7)<\/td>\n\u013dahk\u00fd dopravn\u00edk, n\u00edzkotlakov\u00e9, vysokor\u00fdchlostn\u00e9 tich\u00e9 pohony<\/td>\n<\/tr>\n
Tv\u00e1rna liatina (FCD450)<\/td>\n180\u2013240 HB<\/td>\nMierne<\/td>\n1,4\u00d7<\/td>\nDobr\u00e9<\/td>\n1,2\u20131,4\u00d7<\/td>\nMierne n\u00e1razov\u00e9, po\u013enohospod\u00e1rske, n\u00edzkor\u00fdchlostn\u00e9 priemyseln\u00e9<\/td>\n<\/tr>\n
Uhl\u00edkov\u00e1 oce\u013e C45 \/ 1045 (po obr\u00e1ban\u00ed)<\/td>\n200\u2013250 HB<\/td>\nVysok\u00e1<\/td>\n1,5\u00d7<\/td>\nDobr\u00e9<\/td>\n1,3\u20131,6\u00d7<\/td>\n\u0160tandardn\u00e9 priemyseln\u00e9 pohony, s klzn\u00fdm otvorom alebo s ku\u017ee\u013eov\u00fdm z\u00e1mkom<\/td>\n<\/tr>\n
1045 \/ C45 cementovan\u00e9<\/td>\npovrch HRC 55\u201360<\/td>\nVysok\u00e1<\/td>\n5\u20138\u00d7<\/td>\nDobr\u00e9 (pred stvrdnut\u00edm)<\/td>\n1,8\u20132,5\u00d7<\/td>\nV\u00e4\u010d\u0161ina priemyseln\u00fdch prenosov energie \u2013 \u0161tandardn\u00e1 \u0161pecifik\u00e1cia<\/td>\n<\/tr>\n
Legovan\u00e1 oce\u013e 4140 \/ SCM440 (Q&T)<\/td>\n280\u2013340 HB cez<\/td>\nVe\u013emi vysok\u00e1<\/td>\n3\u20135\u00d7<\/td>\nMierne<\/td>\n2,0\u20133,0\u00d7<\/td>\nVysokon\u00e1razov\u00e9, vysokov\u00fdkonn\u00e9 dopravn\u00edky, lisovac\u00ed transfer<\/td>\n<\/tr>\n
8620 kalen\u00e9<\/td>\npovrch HRC 58\u201362<\/td>\nVe\u013emi vysok\u00e1<\/td>\n7\u201312\u00d7<\/td>\nMierne<\/td>\n2,5\u20133,5\u00d7<\/td>\nVysokocyklov\u00e1, presn\u00e1 index\u00e1cia, automobilov\u00e1 prevodovka<\/td>\n<\/tr>\n
Nerezov\u00e1 oce\u013e 304 \/ 316L<\/td>\n170\u2013200 HB (po obr\u00e1ban\u00ed)<\/td>\nMierne<\/td>\n0,3\u20130,5\u00d7 (ni\u017e\u0161ie ako CI)<\/td>\nMierne<\/td>\n3\u20135\u00d7<\/td>\nPotravin\u00e1rske spracovanie, chemik\u00e1lie, um\u00fdvanie \u2013 nie je odoln\u00e9 vo\u010di opotrebovaniu<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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Kalenie povrchov: Pre\u010do mus\u00ed by\u0165 profil zuba kalen\u00fd po obr\u00e1ban\u00ed, nie pred n\u00edm<\/h2>\n

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Povrchov\u00e1 \u00faprava (cement\u00e1cia alebo induk\u010dn\u00e9 kalenie) vytv\u00e1ra na povrchu zuba tvrd\u00fa vonkaj\u0161iu vrstvu (pl\u00e1\u0161\u0165) a z\u00e1rove\u0148 zachov\u00e1va pod \u0148ou tvrd\u00e9 jadro s n\u00edzkou tvrdos\u0165ou. T\u00e1to kombin\u00e1cia \u2013 tvrd\u00fd povrch pre odolnos\u0165 proti opotrebovaniu, tvrd\u00e9 jadro pre odolnos\u0165 proti n\u00e1razu \u2013 je presne to, \u010do vy\u017eaduje kontakt re\u0165aze s ozuben\u00fdm kolesom: povrch zuba mus\u00ed odol\u00e1va\u0165 opakovan\u00e9mu kontaktn\u00e9mu nam\u00e1haniu val\u010dekov bez opotrebenia, zatia\u013e \u010do kore\u0148 zuba mus\u00ed odol\u00e1va\u0165 ohybov\u00e9mu nam\u00e1haniu od \u0165ahu re\u0165aze bez zlomenia.<\/p>\n

Kritick\u00e1 v\u00fdrobn\u00e1 postupnos\u0165 pri v\u00fdrobe ozuben\u00e9ho kolesa je: obr\u00e1banie profilu zuba na kone\u010dn\u00e9 rozmery, n\u00e1sledn\u00e9 kalenie a n\u00e1sledn\u00e9 jemn\u00e9 dokon\u010dovanie, iba ak je to potrebn\u00e9 pre presnos\u0165 otvoru. Kalenie profilu zuba, ktor\u00fd e\u0161te nebol obroben\u00fd na kone\u010dn\u00e9 rozmery, nie je praktick\u00e9; prekalenie ozuben\u00e9ho kolesa pred obr\u00e1ban\u00edm zuba zni\u017euje \u017eivotnos\u0165 rezn\u00e9ho n\u00e1stroja a vytv\u00e1ra nepresn\u00fa geometriu zuba. Krok kalenia mus\u00ed nasledova\u0165 po obr\u00e1ban\u00ed profilu zuba.<\/p>\n

H\u013abka puzdra ozuben\u00fdch kolies sa pre re\u0165aze #60\u2013#100 zvy\u010dajne \u0161pecifikuje na 0,8\u20131,5 mm. H\u013abka men\u0161ia ako 0,8 mm predstavuje riziko pretrhnutia puzdra v oblasti kore\u0148a zuba, ke\u010f sa zub ohne pod \u0165ahom re\u0165aze. H\u013abka men\u0161ia ako 1,5 mm predstavuje riziko krehkosti cel\u00e9ho prierezu zuba, ak sa h\u013abka puzdra pribl\u00ed\u017ei k hodnote viac ako 25\u2013301 TP3T celkovej hr\u00fabky zuba. Pre aplik\u00e1cie s vysok\u00fdm za\u0165a\u017een\u00edm je spr\u00e1vnym pr\u00edstupom explicitn\u00e9 \u0161pecifikovanie h\u013abky puzdra v objedn\u00e1vke \u2013 nielen \u201ecementovan\u00e9\u201c.<\/p>\n

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Matica rozhodovania o v\u00fdbere materi\u00e1lu<\/h2>\n
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\u0160pecifikujte siv\u00fa liatinu, ke\u010f:<\/div>\n