[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.jenikcz.cz\/protahovaci-trn\/#Article","mainEntityOfPage":"https:\/\/www.jenikcz.cz\/protahovaci-trn\/","headline":"Protahovac\u00ed trn","name":"Protahovac\u00ed trn","description":"Nejen v tov\u00e1rn\u00e1ch, ale tak\u00e9 v ka\u017ed\u00e9 d\u00edln\u011b \u2013 a\u0165 ji\u017e profesion\u00e1ln\u00ed \u010di dom\u00e1c\u00ed, se pou\u017e\u00edv\u00e1 mnoho r\u016fzn\u00fdch p\u0159\u00edstroj\u016f, n\u00e1stroj\u016f, n\u00e1\u0159ad\u00ed a pom\u016fcek, kter\u00e9 jsou v\u00fdsledkem...","datePublished":"2021-08-25","dateModified":"2023-05-31","author":{"@type":"Person","@id":"https:\/\/www.jenikcz.cz\/author\/#Person","name":"","url":"https:\/\/www.jenikcz.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/4eaadff62661a2c38386085c87f88f683e575f9fda122ff8560bf1208996f3c5?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/4eaadff62661a2c38386085c87f88f683e575f9fda122ff8560bf1208996f3c5?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"jenikcz.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.jenikcz.cz\/wp-content\/uploads\/paper-3225109_960_720.jpg","url":"https:\/\/www.jenikcz.cz\/wp-content\/uploads\/paper-3225109_960_720.jpg","height":0,"width":0},"url":"https:\/\/www.jenikcz.cz\/protahovaci-trn\/","about":["Produkty"],"wordCount":565,"articleBody":"   Nejen v tov\u00e1rn\u00e1ch, ale tak\u00e9 v ka\u017ed\u00e9 d\u00edln\u011b \u2013 a\u0165 ji\u017e profesion\u00e1ln\u00ed \u010di dom\u00e1c\u00ed, se pou\u017e\u00edv\u00e1 mnoho r\u016fzn\u00fdch p\u0159\u00edstroj\u016f, n\u00e1stroj\u016f, n\u00e1\u0159ad\u00ed a pom\u016fcek, kter\u00e9 jsou v\u00fdsledkem lidsk\u00e9ho d\u016fvtipu a b\u00e1d\u00e1n\u00ed vyn\u00e1lezc\u016f a zlep\u0161ovatel\u016f minul\u00e9ho stolet\u00ed. Jedn\u00edm z takov\u00fdch n\u00e1stroj\u016f, kter\u00fd je nezpochybniteln\u00fdm pomocn\u00edkem zejm\u00e9na stroja\u0159\u016f, je protahovac\u00ed trn. \u017de jste takov\u00fd n\u00e1zev je\u0161t\u011b nesly\u0161eli? Je to dost pravd\u011bpodobn\u00e9 \u2013 v b\u011b\u017en\u00e9 d\u00edln\u011b dom\u00e1c\u00edch kutil\u016f ho vlastn\u011b ani nenajdete. Ov\u0161em v odborn\u00fdch d\u00edln\u00e1ch a ve stroj\u00edrensk\u00e9m pr\u016fmyslu je to v\u011bc, bez n\u00ed\u017e by se pracovn\u00edci vlastn\u011b ani neobe\u0161li. Bez protahovac\u00edho trnu by toti\u017e nevzniklo mnoho prosp\u011b\u0161n\u00fdch produkt\u016f, kter\u00e9 n\u00e1m usnad\u0148uj\u00ed \u017eivot. Protahovac\u00ed trn slou\u017e\u00ed k obr\u00e1b\u011bn\u00ed materi\u00e1lu a stroj\u00edrensk\u00fdch polotovar\u016f (nap\u0159. r\u016fzn\u00e9 d\u00edly pro automobilov\u00fd \u010di leteck\u00fd pr\u016fmysl, ale i pro ostatn\u00ed dopravn\u00ed prost\u0159edky). P\u0159esn\u011bji \u0159e\u010deno, tento n\u00e1stroj se pou\u017e\u00edv\u00e1 k v\u00fdrob\u011b otvor\u016f (vnit\u0159n\u00ed dr\u00e1\u017ekov\u00e1n\u00ed), kter\u00e9 maj\u00ed jin\u00fd ne\u017eli kruhov\u00fd tvar. Mohou to b\u00fdt t\u0159eba r\u016fzn\u00e9 mnoho\u00faheln\u00edky, nap\u0159\u00edklad lichob\u011b\u017en\u00edky. Protahovac\u00edmu trnu se n\u011bkdy tak\u00e9 \u0159\u00edk\u00e1 protla\u010dovac\u00ed. A jak takov\u00e9 protahov\u00e1n\u00ed neboli protla\u010dov\u00e1n\u00ed prob\u00edh\u00e1? Tento proces je zn\u00e1m\u00fd u\u017e v\u00edce ne\u017e sto let. Stroj, kter\u00fd k t\u00e9to \u010dinnosti slou\u017e\u00ed, se naz\u00fdv\u00e1 protahova\u010dka a funguje na hydraulick\u00fd pohon; a pr\u00e1v\u011b v protahova\u010dce je protahovac\u00ed trn ukotven. Kov, jen\u017e m\u00e1me v \u00famyslu obr\u00e1b\u011bt, se pevn\u011b upne, a po spu\u0161t\u011bn\u00ed za\u010dne trn vykon\u00e1vat pohyb, kter\u00fdm se doc\u00edl\u00ed \u017e\u00e1dan\u00e9ho efektu \u2013 tedy z\u00edsk\u00e1n\u00ed ur\u010dit\u00e9ho otvoru. To v\u0161e prob\u00edh\u00e1 za vysok\u00e9ho tlaku a mechanick\u00e9ho t\u0159en\u00ed.Protahovac\u00ed trn je speci\u00e1ln\u00ed n\u00e1stroj, kter\u00fd sest\u00e1v\u00e1 z mnoha ostr\u00fdch zub\u016f \u2013 b\u0159it\u016f, r\u016fzn\u00fdch velikost\u00ed; neobr\u00e1b\u00ed materi\u00e1l tedy jen jedn\u00edm b\u0159item, ale m\u00e1 celou \u0159adu n\u011bkolika \u0159ezn\u00fdch \u010d\u00e1st\u00ed. Ka\u017ed\u00fd ze zub\u016f odebere z obrobku \u201et\u0159\u00edsku\u201c a kalibrovac\u00ed zuby uprav\u00ed tvar otvoru a jeho rozm\u011bry. Protahovac\u00ed trny se vyr\u00e1b\u00ed ze speci\u00e1ln\u00ed n\u00e1strojov\u00e9 oceli \u010di ze slinut\u00fdch karbid\u016f. Jejich d\u00e9lka m\u016f\u017ee b\u00fdt od des\u00edtky centimetr\u016f a\u017e t\u0159eba do dvou metr\u016f. N\u011bkdy je zapot\u0159eb\u00ed vyu\u017e\u00edt p\u0159i pr\u00e1ci i sadu trn\u016f, nebo\u0165 jeden jedin\u00fd by na obr\u00e1b\u011bn\u00ed nesta\u010dil \u2013 to se uplat\u0148uje hlavn\u011b v s\u00e9riov\u00e9 v\u00fdrob\u011b (nap\u0159. p\u0159i obr\u00e1b\u011bn\u00ed vnit\u0159n\u00edch dr\u00e1\u017eek ozuben\u00fdch kol, u m\u011b\u0159ic\u00ed a regula\u010dn\u00ed techniky, p\u0159i v\u00fdrob\u011b stroj\u016f, n\u00e1stroj\u016f a n\u00e1\u0159ad\u00ed, dom\u00e1c\u00edch elektrospot\u0159ebi\u010d\u016f nebo t\u0159eba u kovov\u00fdch \u010d\u00e1st\u00ed n\u00e1bytku, aj.). Av\u0161ak ani pou\u017eit\u00ed protahovac\u00edch trn\u016f u kusov\u00e9 v\u00fdroby nen\u00ed v\u00fdjimkou.U protahovac\u00edch trn\u016f doch\u00e1z\u00ed postupem \u010dasu k opot\u0159eben\u00ed, a proto je nezbytn\u00e9 prov\u00e1d\u011bt pr\u016fb\u011b\u017en\u011b jejich servis k zaji\u0161t\u011bn\u00ed del\u0161\u00ed \u017eivotnosti \u2013 zejm\u00e9na se jedn\u00e1 o ost\u0159en\u00ed a tak\u00e9 o povrchovou \u00fapravu.                                                                                                                                                                                                                                                                                                                                                                                          4.2\/5 - (8 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Protahovac\u00ed trn","item":"https:\/\/www.jenikcz.cz\/protahovaci-trn\/#breadcrumbitem"}]}]