{"id":3665,"date":"2026-06-20T16:42:45","date_gmt":"2026-06-20T14:42:45","guid":{"rendered":"https:\/\/stalo-se.cz\/?p=3665"},"modified":"2026-06-20T16:42:45","modified_gmt":"2026-06-20T14:42:45","slug":"jak-poznat-kvalitni-zavitnik","status":"publish","type":"post","link":"https:\/\/www.stalo-se.cz\/?p=3665","title":{"rendered":"Jak poznat kvalitn\u00ed z\u00e1vitn\u00edk?"},"content":{"rendered":"\n

Z\u00e1vitn\u00edk je n\u00e1stroj pro vytv\u00e1\u0159en\u00ed vnit\u0159n\u00edch z\u00e1vit\u016f v kovov\u00fdch a n\u011bkter\u00fdch nekovov\u00fdch materi\u00e1lech. Jeho kvalita m\u00e1 z\u00e1sadn\u00ed vliv na p\u0159esnost v\u00fdsledn\u00e9ho z\u00e1vitu, \u017eivotnost n\u00e1stroje i rychlost v\u00fdroby. Pr\u00e1v\u011b proto je tak d\u016fle\u017eit\u00e9 vybrat si ten spr\u00e1vn\u00fd.<\/p>\n\n\n\n

Jin\u00fd z\u00e1vitn\u00edk je pot\u0159eba pro pr\u016fchoz\u00ed otvory, jin\u00fd pro slep\u00e9. Vyb\u00edrat mus\u00edte podle materi\u00e1lu (m\u011bkk\u00fd hlin\u00edk versus tvrd\u0161\u00ed nerezov\u00e1 ocel \u010di litina). Co dal\u0161\u00edho ale obecn\u011b plat\u00ed, abyste si vybrali kvalitn\u00ed z\u00e1vitn\u00edk?<\/p>\n\n\n\n

Z\u00e1kladn\u00ed charakteristika dobr\u00e9ho z\u00e1vitn\u00edku<\/h2>\n\n\n\n

Z\u00e1kladem je p\u0159esn\u00e1 geometrie \u0159ezn\u00fdch hran. Jedin\u011b tak vytvo\u0159\u00edte p\u0159esn\u00fd z\u00e1vit odpov\u00eddaj\u00edc\u00ed toleranc\u00edm a norm\u00e1m. D\u016fle\u017eit\u00e1 je t\u00e9\u017e vysok\u00e1 odolnost proti opot\u0159eben\u00ed. Pot\u0159ebujete, aby si z\u00e1vitn\u00edk<\/a> zachov\u00e1val ostr\u00e9 \u0159ezn\u00e9 hrany po dlouhou dobu a vy jste ho nemuseli \u010dasto m\u011bnit. Nem\u00e9n\u011b kl\u00ed\u010dov\u00e1 je i pevnost a hou\u017eevnatost materi\u00e1lu. Nekvalitn\u00ed n\u00e1stroje praskaj\u00ed a l\u00e1mou se, co\u017e je probl\u00e9m hlavn\u011b u slep\u00fdch otvor\u016f, ze kter\u00fdch pak zlomen\u00fd z\u00e1vitn\u00edk budete jen t\u011b\u017eko dost\u00e1vat.<\/p>\n\n\n\n

Jak pozn\u00e1te, \u017ee z\u00e1vitn\u00edk tohle v\u0161echno spl\u0148uje? Nejjednodu\u0161\u0161\u00ed je nakupovat u prov\u011b\u0159en\u00fdch prodejc\u016f s dobrou pov\u011bst\u00ed. Takov\u00fdm je nap\u0159\u00edklad spole\u010dnost Michovsk\u00fd Tools s e-shopem Nastroje.cz. Prod\u00e1v\u00e1 z\u00e1vitn\u00edky, fr\u00e9zy z monolitn\u00edho tvrdokovu<\/a>, vrt\u00e1ky, kalibry, m\u011b\u0159idla a mnoho dal\u0161\u00edho pro va\u0161i v\u00fdrobu.<\/p>\n\n\n\n

Co materi\u00e1l a ochrann\u00fd povlak vrt\u00e1ku?<\/h2>\n\n\n\n

Pro b\u011b\u017en\u00e9 aplikace jsou \u010dasto vyu\u017e\u00edvan\u00e9 vrt\u00e1ky z rychlo\u0159ezn\u00e9 oceli HSS s dobr\u00fdm pom\u011brem ceny a kvality. Do n\u00e1ro\u010dn\u011bj\u0161\u00edch provoz\u016f se pou\u017e\u00edv\u00e1 kobaltov\u00e1 ocel HSS-E, kter\u00e1 l\u00e9pe zvl\u00e1d\u00e1 opot\u0159eben\u00ed a vysok\u00e9 teploty. St\u00e1le \u010dast\u011bji se vyu\u017e\u00edvaj\u00ed n\u00e1stroje vyroben\u00e9 technologi\u00ed pr\u00e1\u0161kov\u00e9 metalurgie, kter\u00e9 kombinuj\u00ed tvrdost s hou\u017eevnatost\u00ed.<\/p>\n\n\n\n

Modern\u00ed z\u00e1vitn\u00edky b\u00fdvaj\u00ed opat\u0159eny povlaky pro lep\u0161\u00ed vlastnosti. \u010casto jsou to povlaky TiN (nitrid titanu), TiCN (karbonitrid titanu) \u010di TiAIN (nitrid titanu a hlin\u00edku), kter\u00e9 sni\u017euj\u00ed t\u0159en\u00ed, pom\u00e1haj\u00ed odv\u00e1d\u011bt teplo a zvy\u0161uj\u00ed odolnost v\u016f\u010di opot\u0159eben\u00ed.<\/p>\n\n\n\n

Zva\u017ete, co pot\u0159ebujete pro va\u0161i v\u00fdrobu, a vyberte si ide\u00e1ln\u00ed z\u00e1vitn\u00edk na N\u00e1stroje.cz.<\/p>\n","protected":false},"excerpt":{"rendered":"

Z\u00e1vitn\u00edk je n\u00e1stroj pro vytv\u00e1\u0159en\u00ed vnit\u0159n\u00edch z\u00e1vit\u016f v kovov\u00fdch a n\u011bkter\u00fdch nekovov\u00fdch materi\u00e1lech. Jeho kvalita…<\/p>\n","protected":false},"author":4,"featured_media":3666,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"categories":[436],"tags":[503,504],"class_list":["post-3665","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-featured","tag-frezy-z-monolitniho-tvrdokovu","tag-zavitnik"],"amp_enabled":false,"_links":{"self":[{"href":"https:\/\/www.stalo-se.cz\/index.php?rest_route=\/wp\/v2\/posts\/3665","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.stalo-se.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.stalo-se.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.stalo-se.cz\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.stalo-se.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3665"}],"version-history":[{"count":1,"href":"https:\/\/www.stalo-se.cz\/index.php?rest_route=\/wp\/v2\/posts\/3665\/revisions"}],"predecessor-version":[{"id":3667,"href":"https:\/\/www.stalo-se.cz\/index.php?rest_route=\/wp\/v2\/posts\/3665\/revisions\/3667"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.stalo-se.cz\/index.php?rest_route=\/wp\/v2\/media\/3666"}],"wp:attachment":[{"href":"https:\/\/www.stalo-se.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3665"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.stalo-se.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3665"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.stalo-se.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3665"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}