[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.venth.cz\/protahovaci-trn-patri-do-strojirenske-vyroby\/#Article","mainEntityOfPage":"https:\/\/www.venth.cz\/protahovaci-trn-patri-do-strojirenske-vyroby\/","headline":"Protahovac\u00ed trn pat\u0159\u00ed do stroj\u00edrensk\u00e9 v\u00fdroby","name":"Protahovac\u00ed trn pat\u0159\u00ed do stroj\u00edrensk\u00e9 v\u00fdroby","description":"Stroj\u00edrenstv\u00ed je velmi rozs\u00e1hl\u00fd obor, kter\u00fd zahrnuje i obr\u00e1b\u011bn\u00ed kov\u016f. A te\u010f si p\u0159edstavte, \u017ee v\u00e1m, jestli\u017ee nejste stroja\u0159i, n\u011bkdo zad\u00e1 \u00fakol, abyste zhotovili otvor v ocelov\u00e9m v\u00e1le\u010dku ve tvaru sedmic\u00edp\u00e9 hv\u011bzdy. Kdyby to m\u011bl b\u00fdt otvor kruhov\u00fd, bylo by to vcelku snadn\u00e9, proto\u017ee by v\u00e1m na to sta\u010dil docela oby\u010dejn\u00fd vrt\u00e1k. P\u0159\u00edpadn\u011b byste je\u0161t\u011b …","datePublished":"2025-09-08","dateModified":"2025-09-08","author":{"@type":"Person","@id":"https:\/\/www.venth.cz\/author\/#Person","name":"","url":"https:\/\/www.venth.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/9bbe1b3bd68cf5b616cc697a459b86e3be4df6c120806baf939f8aad94b0a3d6?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/9bbe1b3bd68cf5b616cc697a459b86e3be4df6c120806baf939f8aad94b0a3d6?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"venth.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.venth.cz\/wp-content\/uploads\/lock-3109958_640.jpg","url":"https:\/\/www.venth.cz\/wp-content\/uploads\/lock-3109958_640.jpg","height":0,"width":0},"url":"https:\/\/www.venth.cz\/protahovaci-trn-patri-do-strojirenske-vyroby\/","about":["Zbo\u017e\u00ed"],"wordCount":417,"articleBody":"        Stroj\u00edrenstv\u00ed je velmi rozs\u00e1hl\u00fd obor, kter\u00fd zahrnuje i obr\u00e1b\u011bn\u00ed kov\u016f. A te\u010f si p\u0159edstavte, \u017ee v\u00e1m, jestli\u017ee nejste stroja\u0159i, n\u011bkdo zad\u00e1 \u00fakol, abyste zhotovili otvor v ocelov\u00e9m v\u00e1le\u010dku ve tvaru sedmic\u00edp\u00e9 hv\u011bzdy. Kdyby to m\u011bl b\u00fdt otvor kruhov\u00fd, bylo by to vcelku snadn\u00e9, proto\u017ee by v\u00e1m na to sta\u010dil docela oby\u010dejn\u00fd vrt\u00e1k. P\u0159\u00edpadn\u011b byste je\u0161t\u011b pou\u017eili v\u00fdhrubn\u00edk a v\u00fdstru\u017en\u00edk, s nimi\u017e lze vytvo\u0159it p\u0159esn\u011bj\u0161\u00ed otvor. Ale sedmic\u00edpou hv\u011bzdu? To u\u017e je p\u0159ece jen velmi slo\u017eit\u00e1 \u00faloha. Slo\u017eit\u00e9 tvary otvor\u016f se zhotovuj\u00ed pomoc\u00ed protahovac\u00edho trnu. Mohou b\u00fdt osov\u011b soum\u011brn\u00e9 i nesoum\u011brn\u00e9. T\u00edmto zp\u016fsobem se dokonce vyr\u00e1b\u00ed i otvory do cylindrick\u00fdch vlo\u017eek patentn\u00edch dve\u0159n\u00edch z\u00e1mk\u016f. V\u00fdrobn\u00ed proces prob\u00edh\u00e1 takto: Nejprve se v obrobku vytvo\u0159\u00ed kruhov\u00fd otvor, kter\u00fdm se pak protahuje protahovac\u00ed trn I-nastroje. M\u016f\u017eete si jej p\u0159edstavit jako dlouhou ty\u010d, je\u017e je opat\u0159ena \u0159ezn\u00fdmi zuby. Prvn\u00ed zub odebere z otvoru v obrobku ur\u010ditou t\u0159\u00edsku a zub, kter\u00fd se nach\u00e1z\u00ed za n\u00edm, na ten p\u0159edchoz\u00ed nav\u00e1\u017ee a odebere dal\u0161\u00ed t\u0159\u00edsku, tak\u017ee ve fin\u00e1le ten posledn\u00ed zub u\u017e pouze dokon\u010duje pr\u00e1ci a vytv\u00e1\u0159\u00ed po\u017eadovanou podobu otvoru. Po dokon\u010den\u00ed pr\u00e1ce ji\u017e tedy otvor nen\u00ed kruhov\u00fd, ale t\u0159eba v podob\u011b sedmic\u00edp\u00e9 hv\u011bzdy.Protahovac\u00ed trny mohou b\u00fdt drah\u00e9 n\u00e1stroje, cena n\u00e1stroj\u016f z\u00e1vis\u00ed na v\u00edce faktorech, jako je slo\u017eitost zhotovovan\u00e9ho tvaru, velikost trnu atd. Jsou to n\u00e1stroje, kter\u00e9 jsou vhodn\u00e9 pro velk\u00e9 po\u010dty vyr\u00e1b\u011bn\u00fdch obrobk\u016f, tedy pro s\u00e9riovou v\u00fdrobu. Typick\u00fdm p\u0159\u00edkladem vyu\u017eit\u00ed protahovac\u00edch trn\u016f jsou r\u016fzn\u00e9 typy ozuben\u00ed a dr\u00e1\u017eek a tak\u00e9 ji\u017e zm\u00edn\u011bn\u00e9 cylindrick\u00e9 vlo\u017eky do patentn\u00edch dve\u0159n\u00edch z\u00e1mk\u016f. J\u00e1 osobn\u011b jsem se s protahov\u00e1kem setkal a\u017e na st\u0159edn\u00ed \u0161kole a tehdy mi p\u0159ipadal tento n\u00e1stroj velmi zvl\u00e1\u0161tn\u00ed. Vlastn\u011b jsem ani nev\u011bd\u011bl, jak se vyr\u00e1b\u00ed vlo\u017eky do dve\u0159n\u00edch z\u00e1mk\u016f, tak\u017ee kdyby se m\u011b n\u011bkdo v m\u00fdch patn\u00e1cti letech zeptal, jak bych takovou cylindrickou vlo\u017eku do z\u00e1mku zhotovil, nev\u011bd\u011bl bych si rady.                                                                                                                                                                                                                                                                                                                                                                                          3.7\/5 - (4 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Protahovac\u00ed trn pat\u0159\u00ed do stroj\u00edrensk\u00e9 v\u00fdroby","item":"https:\/\/www.venth.cz\/protahovaci-trn-patri-do-strojirenske-vyroby\/#breadcrumbitem"}]}]