[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.csfho.cz\/protahovaci-trn\/#Article","mainEntityOfPage":"https:\/\/www.csfho.cz\/protahovaci-trn\/","headline":"Protahovac\u00ed trn","name":"Protahovac\u00ed trn","description":"Z\u00e1kladn\u00edm principem vrt\u00e1n\u00ed, fr\u00e9zov\u00e1n\u00ed \u010di soustru\u017een\u00ed je rota\u010dn\u00ed ...","datePublished":"2021-12-11","dateModified":"2023-05-01","author":{"@type":"Person","@id":"https:\/\/www.csfho.cz\/author\/#Person","name":"","url":"https:\/\/www.csfho.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/edf965aa5e6319b22667bed24bb070a38fc0326fd1c728db50dc1d860a4a16ad?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/edf965aa5e6319b22667bed24bb070a38fc0326fd1c728db50dc1d860a4a16ad?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"csfho.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.csfho.cz\/wp-content\/uploads\/gear-g1508ee14c_640.png","url":"https:\/\/www.csfho.cz\/wp-content\/uploads\/gear-g1508ee14c_640.png","height":0,"width":0},"url":"https:\/\/www.csfho.cz\/protahovaci-trn\/","about":["N\u00e1kupy"],"wordCount":367,"articleBody":"   Z\u00e1kladn\u00edm principem vrt\u00e1n\u00ed, fr\u00e9zov\u00e1n\u00ed \u010di soustru\u017een\u00ed je rota\u010dn\u00ed pohyb obrobku nebo n\u00e1stroje. Co ale kdy\u017e pot\u0159ebujeme \u010dty\u0159hrann\u00fd otvor? Zn\u00e1te protahova\u010dku a protahovac\u00ed trny I-nastroje? Protahovac\u00ed trn m\u00e1 \u0159adu odstup\u0148ovan\u00fdch b\u0159it\u016f. Stroj na protahov\u00e1n\u00ed je protahova\u010dka, obvykle s hydraulick\u00fdm pohonem. Protahova\u010dka m\u016f\u017ee b\u00fdt svisl\u00e1 nebo vodorovn\u00e1. Obdobn\u00fd princip obr\u00e1b\u011bn\u00ed je protla\u010dov\u00e1n\u00ed, kde stroj na n\u00e1stroj p\u016fsob\u00ed tlakem. Protahovac\u00ed trn je velkou silou protahov\u00e1n p\u0159edvrtan\u00fdm nebo p\u0159edlit\u00fdm otvorem. Hlavn\u00edm pohybem je p\u0159\u00edmo\u010dar\u00fd pohyb n\u00e1stroje, kter\u00fd postupn\u00fdm z\u00e1b\u011brem zub\u016f odeb\u00edr\u00e1 materi\u00e1l za vzniku t\u0159\u00edsky. B\u011bhem operace protahov\u00e1n\u00ed je v\u017edy v z\u00e1b\u011bru v\u00edce zub\u016f, co\u017e zvy\u0161uje produktivitu obr\u00e1b\u011bn\u00ed. Nelze protahovat pln\u00fdm materi\u00e1lem. Protahov\u00e1n\u00edm se obr\u00e1b\u00ed vnit\u0159n\u00ed ozuben\u00ed nebo dr\u00e1\u017ekov\u00e9 n\u00e1boje.Protahov\u00e1n\u00edm se mohou opracov\u00e1vat i slo\u017eit\u00e9 vn\u011bj\u0161\u00ed povrchy. Hlavn\u00edmi v\u00fdhodami protahov\u00e1n\u00ed jsou t\u00e9m\u011b\u0159 libovoln\u00e9 tvary dr\u00e1\u017eek, p\u0159esnost a vysok\u00e1 kvalita povrchu. Nev\u00fdhodou je vy\u0161\u0161\u00ed po\u0159izovac\u00ed cena protahovac\u00edho trnu, kter\u00fd se ale pr\u00e1v\u011b proto pou\u017e\u00edv\u00e1 p\u0159i s\u00e9riov\u00e9 a hromadn\u00e9 v\u00fdrob\u011b, kter\u00e1 je s protahovac\u00edmi trny vysoce produktivn\u00ed. Protahovan\u00ed trny mohou b\u00fdt profilov\u00e9, na jemn\u00e9 dr\u00e1\u017ekov\u00e1n\u00ed, evolventn\u00ed, na dr\u00e1\u017eky pro pera, rovnobok\u00e9 a speci\u00e1ln\u00ed.Protahovac\u00ed trny se vyr\u00e1b\u011bj\u00ed z rychlo\u0159ezn\u00e9 oceli HSS, n\u00e1strojov\u00e1, povlakovan\u00e1 \u010di nepovlakovan\u00e1 oceli nebo ze slinut\u00fdch karbid\u016f. Dle konstruk\u010dn\u00edho hlediska mohou b\u00fdt celistv\u00e9, se vsazovan\u00fdmi zuby nebo skl\u00e1dan\u00e9. Dle proveden\u00ed mohou b\u00fdt jedno\u010dlenn\u00e9 nebo sadov\u00e9. Protahovac\u00ed trn m\u00e1 stopku, vod\u00edc\u00ed \u010d\u00e1st, \u0159eznou \u010d\u00e1st, kalibrovac\u00ed \u010d\u00e1st a zadn\u00ed veden\u00ed. N\u00e1stroj je upnut\u00fd na obou konc\u00edch ve stroji. Opot\u0159eben\u00fd n\u00e1stroj se d\u00e1 op\u011btovn\u011b nabrousit a t\u00edm se zv\u00fd\u0161\u00ed jeho \u017eivotnost. Pot\u0159ebujete vyrobit vnit\u0159n\u00ed \u010dty\u0159hran nebo dr\u00e1\u017ekov\u00fd n\u00e1boj? Koukn\u011bte na n\u00e1\u0161 web a vyberte si vhodn\u00fd rozm\u011br protahovac\u00edho trnu.                                                                                                                                                                                                                                                                                                                                                                                          3.7\/5 - (7 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Protahovac\u00ed trn","item":"https:\/\/www.csfho.cz\/protahovaci-trn\/#breadcrumbitem"}]}]