[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.vkolonce.cz\/k-cemu-je-potrebny-protahovaci-trn-a-co-to-vlastne-je\/#Article","mainEntityOfPage":"https:\/\/www.vkolonce.cz\/k-cemu-je-potrebny-protahovaci-trn-a-co-to-vlastne-je\/","headline":"K \u010demu je pot\u0159ebn\u00fd protahovac\u00ed trn a co to vlastn\u011b je","name":"K \u010demu je pot\u0159ebn\u00fd protahovac\u00ed trn a co to vlastn\u011b je","description":"Stroj\u00edrensk\u00e1 v\u00fdroba je pro mnoho laik\u016f skute\u010dnou z\u00e1hadou, je to jeden z nejslo\u017eit\u011bj\u0161\u00edch a nejn\u00e1ro\u010dn\u011bj\u0161\u00edch obor\u016f lidsk\u00e9 \u010dinnosti a zdaleka nejde o pouh\u00e9 soustruhy, kter\u00e9 m\u016f\u017eete zahl\u00e9dnout v kdejak\u00e9m propagandistick\u00e9m t\u00fdden\u00edku z obdob\u00ed socialismu. Stroj\u00edrenstv\u00ed \u2013 to jsou i protahovac\u00ed trny Stroja\u0159i dob\u0159e znaj\u00ed protahovac\u00ed trny https:\/\/www.i-nastroje.cz\/protahovaci-trny, je to jedno","datePublished":"2020-12-01","dateModified":"2023-05-03","author":{"@type":"Person","@id":"https:\/\/www.vkolonce.cz\/author\/#Person","name":"","url":"https:\/\/www.vkolonce.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/01173f1da90dde8adb887d6793fa4e42c4004e53f8d645d9b1cb57c2dee8e188?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/01173f1da90dde8adb887d6793fa4e42c4004e53f8d645d9b1cb57c2dee8e188?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"vkolonce.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.vkolonce.cz\/wp-content\/uploads\/z%C3%A1mek%20ve%20dve%C5%99%C3%ADch.jpg","url":"https:\/\/www.vkolonce.cz\/wp-content\/uploads\/z%C3%A1mek%20ve%20dve%C5%99%C3%ADch.jpg","height":0,"width":0},"url":"https:\/\/www.vkolonce.cz\/k-cemu-je-potrebny-protahovaci-trn-a-co-to-vlastne-je\/","wordCount":428,"articleBody":"   Stroj\u00edrensk\u00e1 v\u00fdroba je pro mnoho laik\u016f skute\u010dnou z\u00e1hadou, je to jeden z nejslo\u017eit\u011bj\u0161\u00edch a nejn\u00e1ro\u010dn\u011bj\u0161\u00edch obor\u016f lidsk\u00e9 \u010dinnosti a zdaleka nejde o pouh\u00e9 soustruhy, kter\u00e9 m\u016f\u017eete zahl\u00e9dnout v kdejak\u00e9m propagandistick\u00e9m t\u00fdden\u00edku z obdob\u00ed socialismu.Stroj\u00edrenstv\u00ed \u2013 to jsou i protahovac\u00ed trnyStroja\u0159i dob\u0159e znaj\u00ed protahovac\u00ed trny https:\/\/www.i-nastroje.cz\/protahovaci-trny, je to jedno z t\u00e9mat u\u010diva ji\u017e na st\u0159edn\u00ed pr\u016fmyslov\u00e9 \u0161kole ve t\u0159et\u00edm ro\u010dn\u00edku a maj\u00ed-li studenti \u0161t\u011bst\u00ed, mohou se s nimi sezn\u00e1mit i v praxi. Lidov\u011b se jim \u0159\u00edk\u00e1 \u201eprotahov\u00e1ky\u201c, jsou ta\u017eeny (nikoli tla\u010deny) up\u00ednac\u00edm segmentem obr\u00e1b\u011bc\u00edho stroje p\u0159edvrtan\u00fdm, p\u0159\u00edpadn\u011b odl\u00e9van\u00fdm otvorem uvnit\u0159 obrobku (odlitku) a t\u00edm vytv\u00e1\u0159\u00ed r\u016fzn\u00e9 vnit\u0159n\u00ed tvary, zpravidla nepravideln\u00e9ho \u010di osov\u011b nesoum\u011brn\u00e9ho pr\u016f\u0159ezu. Tvary mohou b\u00fdt skute\u010dn\u011b r\u016fzn\u00e9, nap\u0159. mnoho\u00faheln\u00edky, rovn\u00e9 \u010di \u0161ikm\u00e9 dr\u00e1\u017eky, zoubky, z\u00e1\u0159ezy.Takto se kup\u0159\u00edkladu vyr\u00e1b\u00ed dr\u00e1\u017eka pro pero u ozuben\u00e9ho kola, kter\u00e9 se upev\u0148uje na h\u0159\u00eddel, anebo vnit\u0159n\u00ed profil dr\u00e1\u017eek u v\u0161ech vlo\u017eek b\u011b\u017en\u00fdch klasick\u00fdch patentn\u00edch z\u00e1mk\u016f.Hlavn\u00ed d\u016fvod, pro\u010d se s v\u00fdrobou protahovac\u00edch trn\u016f za\u010dalo ji\u017e p\u0159ed mnoha lety, je obt\u00ed\u017en\u00e9 obr\u00e1b\u011bn\u00ed t\u011bchto, zvl\u00e1\u0161t\u011b nepravideln\u00fdch, otvor\u016f kovov\u00fdch sou\u010d\u00e1st\u00ed. U drobn\u00fdch sou\u010d\u00e1stek, jimi\u017e jsou kup\u0159\u00edkladu patentn\u00ed z\u00e1mky, by bylo tak\u0159ka nemo\u017en\u00e9 zhotovit nepravideln\u00fd mal\u00fd otvor jin\u00fdm zp\u016fsobem, ne\u017e pr\u00e1v\u011b protahov\u00e1kem.Jak vlastn\u011b takov\u00fd trn vypad\u00e1? Je zhotoven z kvalitn\u00ed n\u00e1strojov\u00e9 oceli, d\u00e9lka trnu dosahuje n\u011bkolika des\u00edtek centimetr\u016f a \u010dinn\u00e1 \u010d\u00e1st sest\u00e1v\u00e1 z odstup\u0148ovan\u00fdch \u0159ezn\u00fdch b\u0159it\u016f, kter\u00e9 jeden po druh\u00e9m postupn\u011b odeb\u00edraj\u00ed t\u0159\u00edsku na obrobku, aby po pr\u016ftahu posledn\u00edho b\u0159itu do\u0161lo k po\u017eadovan\u00e9mu v\u00fdsledku (tvaru a rozm\u011bru vnit\u0159n\u00edho otvoru).Produktivita pr\u00e1ce v s\u00e9riov\u00e9 v\u00fdrob\u011bProtahov\u00e1ky maj\u00ed i sv\u016fj rub a t\u00edm je jejich po\u0159izovac\u00ed cena. Je pom\u011brn\u011b vysok\u00e1 a tak se vyplat\u00ed hlavn\u011b u s\u00e9riov\u00e9 v\u00fdroby. Otvory v obrobc\u00edch jsou v\u0161ak velmi p\u0159esn\u00e9, maj\u00ed po\u017eadovanou jakost povrchu a v\u00fdrobn\u00ed proces umo\u017e\u0148uje v relativn\u011b kr\u00e1tk\u00e9m \u010dase zhotovit stovky a\u017e tis\u00edce kus\u016f.                                                                                                                                                                                                                                                                                                                                                                                          4.2\/5 - (8 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"K \u010demu je pot\u0159ebn\u00fd protahovac\u00ed trn a co to vlastn\u011b je","item":"https:\/\/www.vkolonce.cz\/k-cemu-je-potrebny-protahovaci-trn-a-co-to-vlastne-je\/#breadcrumbitem"}]}]