{"id":2608,"date":"2021-06-08T05:25:03","date_gmt":"2021-06-08T05:25:03","guid":{"rendered":"https:\/\/pj4iaixa9m.wpdns.site\/?p=2608"},"modified":"2021-08-04T14:15:21","modified_gmt":"2021-08-04T14:15:21","slug":"3-things-you-need-to-know-about-bent-parts-by-punch","status":"publish","type":"post","link":"https:\/\/harslepress.com\/cs\/3-things-you-need-to-know-about-bent-parts-by-punch\/","title":{"rendered":"3 v\u011bci, kter\u00e9 pot\u0159ebujete v\u011bd\u011bt o oh\u00fdb\u00e1n\u00ed d\u00edl\u016f d\u011brov\u00e1n\u00edm"},"content":{"rendered":"<p class=\"yoast-reading-time__wrapper\"><span class=\"yoast-reading-time__icon\"><\/span><span class=\"yoast-reading-time__descriptive-text\">P\u0159edpokl\u00e1dan\u00e1 doba \u010dten\u00ed:  <\/span><span class=\"yoast-reading-time__reading-time\">14<\/span><span class=\"yoast-reading-time__time-unit\"> minut<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-calculation-of-unfolded-dimensions-of-bent-parts-by-punch\"><strong>V\u00fdpo\u010det rozlo\u017een\u00fdch rozm\u011br\u016f oh\u00fdban\u00fdch d\u00edl\u016f<\/strong> podle <a href=\"https:\/\/www.harsle.com\/J23-Inclinable-Punching-Machine-pd6320164.html\" target=\"_blank\" rel=\"noopener\">r\u00e1na p\u011bst\u00ed<\/a><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-determination-of-the-position-of-the-curved-neutral-layer\"><strong>Ur\u010den\u00ed polohy zak\u0159iven\u00e9 neutr\u00e1ln\u00ed vrstvy<\/strong><strong><\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Ohnut\u00e1 neutr\u00e1ln\u00ed vrstva se t\u00fdk\u00e1 kovov\u00e9 vrstvy, jej\u00ed\u017e d\u00e9lka z\u016fst\u00e1v\u00e1 nezm\u011bn\u011bna p\u0159ed a po ohybov\u00e9 deformaci, tak\u017ee roz\u0161\u00ed\u0159en\u00e1 d\u00e9lka ohnut\u00e9 neutr\u00e1ln\u00ed vrstvy je velikost polotovaru oh\u00fdban\u00e9 \u010d\u00e1sti. Aby bylo mo\u017en\u00e9 vypo\u010d\u00edtat expandovanou velikost zak\u0159iven\u00e9 neutr\u00e1ln\u00ed vrstvy, mus\u00ed b\u00fdt nejprve ur\u010dena poloha neutr\u00e1ln\u00ed vrstvy. Polohu neutr\u00e1ln\u00ed vrstvy lze ur\u010dit podle jej\u00edho polom\u011bru ohybu \u03c1, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-1. \u03c1 lze vypo\u010d\u00edtat podle n\u00e1sleduj\u00edc\u00edho vzorce empiricky.<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">\u03c1=r+xt<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kde \u03c1\u2014 polom\u011br ohybu neutr\u00e1ln\u00ed vrstvy, mm;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">r \u2013 vnit\u0159n\u00ed polom\u011br ohybu, mm;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">l\u2014tlou\u0161\u0165ka materi\u00e1lu, mm;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">x \u2013 koeficient posunut\u00ed neutr\u00e1ln\u00ed vrstvy,<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dal\u0161\u00ed informace naleznete v n\u00e1sleduj\u00edc\u00ed tabulce:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-1-1.jpg\" alt=\"Obr\u00e1zek 1-1 Poloha neutr\u00e1ln\u00ed vrstvy d\u011brov\u00e1n\u00ed\" class=\"wd-lazy-fade wp-image-2610\" width=\"500\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-1-1.jpg 600w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-1-1-150x98.jpg 150w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-1-1-300x196.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption>Obr\u00e1zek 1-1 Poloha deforma\u010dn\u011b neutr\u00e1ln\u00ed vrstvy<\/figcaption><\/figure><\/div>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">r\/t<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.1<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.2<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.3<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.4<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.6<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.7<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.8<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.0<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.2<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.21<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.22<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.23<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.23<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.25<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.26<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.28<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.30<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.32<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.33<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">r\/t<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.3<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">2.0<\/td><td class=\"has-text-align-center\" data-align=\"center\">2.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.0<\/td><td class=\"has-text-align-center\" data-align=\"center\">4.0<\/td><td class=\"has-text-align-center\" data-align=\"center\">5.0<\/td><td class=\"has-text-align-center\" data-align=\"center\">6.0<\/td><td class=\"has-text-align-center\" data-align=\"center\">7.0<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u22658,0<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.34<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.36<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.38<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.39<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.40<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.42<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.44<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.46<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.48<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.50<\/td><\/tr><\/tbody><\/table><figcaption>Sou\u010dinitel posunut\u00ed neutr\u00e1ln\u00ed vrstvy<\/figcaption><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>V\u00fdpo\u010det neslo\u017een\u00e9 d\u00e9lky polotovaru oh\u00fdban\u00e9ho d\u00edlu<\/strong><strong><\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Po ur\u010den\u00ed polohy neutr\u00e1ln\u00ed vrstvy lze d\u00e9lku polotovaru vypo\u010d\u00edtat p\u0159\u00edmo n\u00ed\u017ee popsan\u00fdm zp\u016fsobem pro oh\u00fdban\u00e9 \u010d\u00e1sti s relativn\u011b jednoduch\u00fdm tvarem a n\u00edzkou rozm\u011brovou p\u0159esnost\u00ed. U zak\u0159iven\u00fdch d\u00edl\u016f se slo\u017eit\u011bj\u0161\u00edmi tvary nebo vysok\u00fdmi po\u017eadavky na p\u0159esnost je po pou\u017eit\u00ed n\u00e1sleduj\u00edc\u00edho vzorce pro po\u010d\u00e1te\u010dn\u00ed v\u00fdpo\u010det d\u00e9lky polotovaru nutn\u00e9 opakovan\u011b zkou\u0161et oh\u00fdb\u00e1n\u00ed a pr\u016fb\u011b\u017en\u011b jej korigovat, aby se nakonec ur\u010dil tvar a velikost polotovaru.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\" id=\"h-the-unfolded-length-of-the-bending-piece-with-the-fillet-radius-r-0-5t\">Rozlo\u017een\u00e1 d\u00e9lka oh\u00fdban\u00e9ho kusu s polom\u011brem zaoblen\u00ed r&gt;0,5t<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Jak ji\u017e bylo zm\u00edn\u011bno v\u00fd\u0161e, rozlo\u017een\u00e1 d\u00e9lka tohoto druhu oh\u00fdban\u00e9ho kusu se vypo\u010d\u00edt\u00e1v\u00e1 na z\u00e1klad\u011b principu, \u017ee velikost neutr\u00e1ln\u00ed vrstvy polotovaru p\u0159ed a po ohnut\u00ed z\u016fst\u00e1v\u00e1 nezm\u011bn\u011bna. Rozlo\u017een\u00e1 d\u00e9lka se rovn\u00e1 sou\u010dtu rozlo\u017een\u00fdch d\u00e9lek v\u0161ech rovn\u00fdch \u010d\u00e1st\u00ed a neutr\u00e1ln\u00ed vrstvy oh\u00fdban\u00e9 \u010d\u00e1sti, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-2. Kroky v\u00fdpo\u010dtu jsou n\u00e1sleduj\u00edc\u00ed.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Nejprve vypo\u010d\u00edtejte d\u00e9lku \u00fase\u010dek a, b, c\u2026;<\/li><li>Za druh\u00e9, vypo\u010d\u00edtejte r\/t a zjist\u011bte hodnotu koeficientu posunut\u00ed neutr\u00e1ln\u00ed vrstvy x podle n\u00ed\u017ee uveden\u00e9 tabulky;<\/li><li>Za t\u0159et\u00ed vypo\u010d\u00edtejte polom\u011br ohybu \u03c1 neutr\u00e1ln\u00ed vrstvy ka\u017ed\u00e9ho obloukov\u00e9ho segmentu podle vzorce;<\/li><\/ul>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">\u03c1=r+xt<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Podle polom\u011bru ohybu ka\u017ed\u00e9 neutr\u00e1ln\u00ed vrstvy \u03c1<sub>1<\/sub>, \u03c1<sub>2<\/sub>\u2026 a odpov\u00eddaj\u00edc\u00ed st\u0159edov\u00fd \u00fahel ohybu \u03b1<sub>1<\/sub>, \u03b1<sub>2<\/sub>\u2026Vypo\u010d\u00edtejte d\u00e9lku rozta\u017een\u00ed ka\u017ed\u00e9ho obloukov\u00e9ho segmentu l<sub>1<\/sub>, l<sub>2<\/sub>&#8230;<\/li><\/ul>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">l=\u03c0\u03c1\u03b1\/180\u00b0<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Vypo\u010d\u00edtejte celkovou rozta\u017eenou d\u00e9lku L<sub>z<\/sub>.<\/li><\/ul>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">L<sub>z<\/sub>=a+b+c+\u2026+l<sub>1<\/sub>+l<sub>2<\/sub>+l<sub>3<\/sub>+&#8230;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img class=\"wd-lazy-fade\" decoding=\"async\" width=\"600\" height=\"214\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-2-2.jpg\" alt=\"Obr\u00e1zek 1-2 Roz\u0161\u00ed\u0159en\u00e1 d\u00e9lka s polom\u011brem zaoblen\u00ed r\uff1e0,5t 90\u00b0 \u00fahlov\u00e1 oh\u00fdbac\u00ed \u010d\u00e1st\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-2-2.jpg 600w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-2-2-300x107.jpg 300w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-2-2-18x6.jpg 18w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-2-2-150x54.jpg 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption>Obr\u00e1zek 1-2 Roz\u0161\u00ed\u0159en\u00e1 d\u00e9lka s polom\u011brem zaoblen\u00ed r\uff1e0,5t 90\u00b0 oh\u00fdbac\u00ed \u010d\u00e1st&nbsp;<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Kdy\u017e je \u00fahel ohybu oh\u00fdban\u00e9 \u010d\u00e1sti 90\u00b0, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-2, lze v\u00fdpo\u010det d\u00e9lky rozta\u017een\u00ed oh\u00fdban\u00e9 \u010d\u00e1sti zjednodu\u0161it jako<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">L<sub>z<\/sub>=a+b+c+1,57(r+xt)<\/p>\n\n\n\n<h5 class=\"wp-block-heading\" id=\"h-fillet-radius-r-0-5t-bending-length\">Polom\u011br zaoblen\u00ed r\uff1c0,5t d\u00e9lka ohybu<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">U oh\u00fdban\u00e9ho d\u00edlu s r&lt;0,5t se p\u0159i deformaci ohybem v\u00e1\u017en\u011b zten\u010duje nejen zaoblen\u00e1 deforma\u010dn\u00ed z\u00f3na d\u00edlu, ale zten\u010duje se i p\u0159ilehl\u00e1 rovn\u00e1 hrana, proto by m\u011bl b\u00fdt polotovar ur\u010den podle podm\u00ednky konstantn\u00ed objem p\u0159ed a po deformaci. d\u00e9lka. Obvykle se vypo\u010d\u00edt\u00e1v\u00e1 pomoc\u00ed empirick\u00e9ho vzorce uveden\u00e9ho v tabulce n\u00ed\u017ee.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Skica<\/td><td class=\"has-text-align-center\" data-align=\"center\">V\u00fdpo\u010dtov\u00fd vzorec<\/td><td class=\"has-text-align-center\" data-align=\"center\">Skica<\/td><td class=\"has-text-align-center\" data-align=\"center\">V\u00fdpo\u010dtov\u00fd vzorec<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><img decoding=\"async\" width=\"128\" height=\"60\" src=\"\">&nbsp;<img decoding=\"async\" width=\"200\" height=\"93\" class=\"wd-lazy-fade wp-image-2612\" style=\"width: 150px\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c.jpg\" alt=\"\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c.jpg 200w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c-18x8.jpg 18w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c-150x70.jpg 150w\" sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/td><td class=\"has-text-align-center\" data-align=\"center\">L<sub>z<\/sub>=l<sub>1<\/sub>+l<sub>2<\/sub>+0.4&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\"><img decoding=\"async\" width=\"128\" height=\"73\" src=\"\">&nbsp;<img decoding=\"async\" width=\"200\" height=\"114\" class=\"wd-lazy-fade wp-image-2613\" style=\"width: 150px\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c-\u526f\u672c.jpg\" alt=\"\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c-\u526f\u672c.jpg 200w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c-\u526f\u672c-150x86.jpg 150w\" sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/td><td class=\"has-text-align-center\" data-align=\"center\">L<sub>z<\/sub>=l<sub>1<\/sub>+l<sub>2<\/sub>+l<sub>3<\/sub>+0,6t<br>(Ohn\u011bte dva rohy najednou)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><img decoding=\"async\" width=\"128\" height=\"57\" src=\"\">&nbsp;<img decoding=\"async\" width=\"200\" height=\"89\" class=\"wd-lazy-fade wp-image-2614\" style=\"width: 150px\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c-\u526f\u672c-2.jpg\" alt=\"\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c-\u526f\u672c-2.jpg 200w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c-\u526f\u672c-2-150x67.jpg 150w\" sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/td><td class=\"has-text-align-center\" data-align=\"center\">L<sub>z<\/sub>=l<sub>1<\/sub>+l<sub>2<\/sub>+0.4&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\"><img decoding=\"async\" width=\"128\" height=\"75\" src=\"\">&nbsp;<img decoding=\"async\" width=\"200\" height=\"116\" class=\"wd-lazy-fade wp-image-2615\" style=\"width: 150px\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c-\u526f\u672c-3.jpg\" alt=\"\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c-\u526f\u672c-3.jpg 200w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-3-\u8868\u683c-\u526f\u672c-3-150x87.jpg 150w\" sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/td><td class=\"has-text-align-center\" data-align=\"center\">L<sub>z<\/sub>=l<sub>1<\/sub>+l<sub>2<\/sub>+l<sub>3<\/sub>+t<br>(Ohn\u011bte dva rohy najednou)<br>L<sub>z<\/sub>=l<sub>1<\/sub>+2l<sub>2<\/sub>+2l<sub>3<\/sub>+1,2 t<br>(Rozd\u011bleno do dvou ohyb\u016f ve \u010dty\u0159ech roz\u00edch)<\/td><\/tr><\/tbody><\/table><figcaption>V\u00fdpo\u010dtov\u00fd vzorec d\u00e9lky polotovaru oh\u00fdban\u00e9 \u010d\u00e1sti s r\uff1c0,5t<\/figcaption><\/figure>\n\n\n\n<h5 class=\"wp-block-heading\" id=\"h-hinged-bending-parts-by-punching-machine\">Sklopn\u00e9 oh\u00fdbac\u00ed d\u00edly od <a href=\"https:\/\/www.harsle.com\/J23-Inclinable-Punching-Machine-pd6320164.html\" target=\"_blank\" rel=\"noopener\">d\u011brovac\u00ed stroj<\/a><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">U d\u00edl\u016f z\u00e1v\u011bs\u016f s r=(0,6~7,5)t, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-4, se pro tvarov\u00e1n\u00ed obvykle pou\u017e\u00edv\u00e1 metoda v\u00e1lcov\u00e1n\u00ed. B\u011bhem procesu v\u00e1lcov\u00e1n\u00ed plech zes\u00edl\u00ed a neutr\u00e1ln\u00ed vrstva se posune sm\u011brem ven. D\u00e9lka polotovaru L<sub>z<\/sub>&nbsp;lze p\u0159ibli\u017en\u011b vypo\u010d\u00edtat podle n\u00e1sleduj\u00edc\u00edho vzorce.<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">L<sub>z<\/sub>=l+.1,5\u03c0\uff08r+x<sub>1<\/sub>t\uff09+r\u2248l+5,7r+4,7x<sub>1<\/sub>t<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ve vzorci l \u2013 d\u00e9lka p\u0159\u00edmky;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">r \u2013 vnit\u0159n\u00ed polom\u011br z\u00e1v\u011bsu;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">X<sub>1<\/sub>\u2014Koeficient posunut\u00ed neutr\u00e1ln\u00ed vrstvy, viz tabulka n\u00ed\u017ee.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-4.jpg\" alt=\"Obr\u00e1zek 1-4 Kloubov\u00e9 oh\u00fdban\u00e9 d\u00edly\" class=\"wd-lazy-fade wp-image-2616\" width=\"500\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-4.jpg 600w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-4-150x83.jpg 150w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-4-300x166.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption>Obr\u00e1zek 1-4 Kloubov\u00e9 oh\u00fdban\u00e9 d\u00edly<\/figcaption><\/figure><\/div>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">r\/t<\/td><td class=\"has-text-align-center\" data-align=\"center\">\uff1e0,5~0,6<\/td><td class=\"has-text-align-center\" data-align=\"center\">\uff1e0,6~0,8<\/td><td class=\"has-text-align-center\" data-align=\"center\">\uff1e0,8~1<\/td><td class=\"has-text-align-center\" data-align=\"center\">\uff1e1~1.2<\/td><td class=\"has-text-align-center\" data-align=\"center\">\uff1e1,2~1,5<\/td><td class=\"has-text-align-center\" data-align=\"center\">\uff1e1,5~1,8<\/td><td class=\"has-text-align-center\" data-align=\"center\">\uff1e1,8~2<\/td><td class=\"has-text-align-center\" data-align=\"center\">\uff1e2~2.2<\/td><td class=\"has-text-align-center\" data-align=\"center\">\uff1e2.2<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">X<sub>1<\/sub>(mm)<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.76<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.73<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.7<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.67<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.64<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.61<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.58<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.54<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.5<\/td><\/tr><\/tbody><\/table><figcaption>Posun neutr\u00e1ln\u00ed vrstvy x<sub>1<\/sub> hodnota p\u0159i curlingu<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>V\u00fdpo\u010det ohybov\u00e9 s\u00edly<\/strong><strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Oh\u00fdbac\u00ed s\u00edla je jedn\u00edm z d\u016fle\u017eit\u00fdch podklad\u016f pro v\u00fdb\u011br lis\u016f a konstrukci forem. Velikost ohybov\u00e9 s\u00edly nesouvis\u00ed pouze s velikost\u00ed polotovaru, mechanick\u00fdmi vlastnostmi materi\u00e1lu, vzd\u00e1lenost\u00ed mezi osami matrice, polom\u011brem ohybu a mezerou mezi konvexn\u00ed a konk\u00e1vn\u00ed matric\u00ed, ale m\u00e1 tak\u00e9 velk\u00fd vztah k metoda oh\u00fdb\u00e1n\u00ed. Je obt\u00ed\u017en\u00e9 p\u0159esn\u011b vypo\u010d\u00edtat pomoc\u00ed metody teoretick\u00e9 anal\u00fdzy. Proto se ve v\u00fdrob\u011b \u010dasto pou\u017e\u00edvaj\u00ed empirick\u00e9 vzorce.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Voln\u00fd, uvolnit <a href=\"https:\/\/harslepress.com\/cs\/product\/100t-punching-machine-steel-hinge-making-automatic-power-press-production-line-foil-container-making-machine\/\">d\u011brov\u00e1n\u00ed<\/a> a oh\u00fdbac\u00ed s\u00edla<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Voln\u00e9 oh\u00fdb\u00e1n\u00ed lze rozd\u011blit na voln\u00e9 oh\u00fdb\u00e1n\u00ed ve tvaru V a voln\u00e9 oh\u00fdb\u00e1n\u00ed ve tvaru U podle tvaru oh\u00fdban\u00e9 \u010d\u00e1sti. U d\u00edl\u016f ve tvaru V vzorec pro v\u00fdpo\u010det ohybov\u00e9 s\u00edly F<sub>z<\/sub>&nbsp;je<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">F<sub>z<\/sub>= 0,6 kbt<sup>2<\/sup>\u03c3<sub>b<\/sub>\/ (r+t)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">U d\u00edl\u016f ve tvaru U vzorec pro v\u00fdpo\u010det ohybov\u00e9 s\u00edly F<sub>z<\/sub>&nbsp;je<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">F<sub>z<\/sub>= 0,7 kbt<sup>2<\/sup>\u03c3<sub>b<\/sub>\/ (r+t)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kde F<sub>z<\/sub>\u2014 ohybov\u00e1 s\u00edla materi\u00e1lu na konci lisovac\u00edho zdvihu, N;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b \u2013 \u0161\u00ed\u0159ka oh\u00fdban\u00e9 \u010d\u00e1sti, mm;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">t \u2013 tlou\u0161\u0165ka oh\u00fdban\u00e9 \u010d\u00e1sti, mm;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">r \u2014 Polom\u011br ohybu oh\u00fdban\u00e9 \u010d\u00e1sti, mm;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u03c3<sub>b<\/sub>\u2014mez pevnosti materi\u00e1lu, MPa;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">K \u2013 bezpe\u010dnostn\u00ed faktor, obecn\u011b K=1,3.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Korekce ohybu <\/strong><a href=\"https:\/\/harslepress.com\/cs\/an-introduction-to-the-calculation-of-punching-force-and-punching-pressure-center\/\"><strong>platnost<\/strong> silov\u00fdm lisem<\/a><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Kdy\u017e je oh\u00fdban\u00e1 \u010d\u00e1st korigov\u00e1na tlakem matrice na konci lisov\u00e1n\u00ed, lze korek\u010dn\u00ed s\u00edlu F1 ohybu aproximovat pomoc\u00ed n\u00e1sleduj\u00edc\u00edho vzorce.<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">F<sub>J<\/sub>=qA<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ve vzorci F<sub>J<\/sub>\u2014 ohybov\u00e1 korek\u010dn\u00ed s\u00edla, N;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">q\u2014Jednotkov\u00e1 korek\u010dn\u00ed s\u00edla, MPa, jej\u00ed hodnota je uvedena v tabulce n\u00ed\u017ee;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A\u2014Prom\u00edtnut\u00e1 plocha korigovan\u00e9 \u010d\u00e1sti obrobku, mm<sup>2<\/sup>.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Materi\u00e1l&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">Tlou\u0161\u0165ka materi\u00e1lu (mm)<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;Tlou\u0161\u0165ka materi\u00e1lu (mm)<\/td><td class=\"has-text-align-center\" data-align=\"center\">Tlou\u0161\u0165ka materi\u00e1lu (mm)&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;Tlou\u0161\u0165ka materi\u00e1lu (mm)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u22641<\/td><td class=\"has-text-align-center\" data-align=\"center\">\uff1e1~2<\/td><td class=\"has-text-align-center\" data-align=\"center\">\uff1e2~5<\/td><td class=\"has-text-align-center\" data-align=\"center\">\uff1e5~10<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Hlin\u00edk<\/td><td class=\"has-text-align-center\" data-align=\"center\">15~20<\/td><td class=\"has-text-align-center\" data-align=\"center\">20~30<\/td><td class=\"has-text-align-center\" data-align=\"center\">30~40<\/td><td class=\"has-text-align-center\" data-align=\"center\">40~50<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Mosaz<\/td><td class=\"has-text-align-center\" data-align=\"center\">20~30<\/td><td class=\"has-text-align-center\" data-align=\"center\">30~40<\/td><td class=\"has-text-align-center\" data-align=\"center\">40~60<\/td><td class=\"has-text-align-center\" data-align=\"center\">60~80<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">10~20 oceli<\/td><td class=\"has-text-align-center\" data-align=\"center\">30~40<\/td><td class=\"has-text-align-center\" data-align=\"center\">40~50<\/td><td class=\"has-text-align-center\" data-align=\"center\">60~80<\/td><td class=\"has-text-align-center\" data-align=\"center\">80~100<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">25~30 ocel<\/td><td class=\"has-text-align-center\" data-align=\"center\">40~50<\/td><td class=\"has-text-align-center\" data-align=\"center\">50~60<\/td><td class=\"has-text-align-center\" data-align=\"center\">70~100<\/td><td class=\"has-text-align-center\" data-align=\"center\">100~120<\/td><\/tr><\/tbody><\/table><figcaption>Jednotkov\u00e1 korek\u010dn\u00ed s\u00edla q (jednotka MPa)<\/figcaption><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>S\u00edla vyhazova\u010de pop\u0159 <a href=\"https:\/\/harslepress.com\/cs\/product\/100t-punching-machine-steel-hinge-making-automatic-power-press-production-line-foil-container-making-machine\/\">d\u011brovac\u00ed lisov\u00e1n\u00ed<\/a> platnost<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">U oh\u00fdbac\u00edho n\u00e1stroje se za\u0159\u00edzen\u00edm na horn\u00ed d\u00edl nebo lisovac\u00edm za\u0159\u00edzen\u00edm je s\u00edla F na horn\u00ed d\u00edl<sub>d<\/sub>&nbsp;nebo p\u0159\u00edtla\u010dn\u00e1 s\u00edla F<sub>y<\/sub>&nbsp;m\u016f\u017ee b\u00fdt p\u0159ibli\u017en\u011b 30% a\u017e 80% voln\u00e9 ohybov\u00e9 s\u00edly.<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">F<sub>d <\/sub>(nebo) F<sub>y<\/sub>=(0,3~0,8) F<sub>z<\/sub><sub><\/sub><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Stanoven\u00ed ton\u00e1\u017ee lisu<\/strong><strong><\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Ton\u00e1\u017e voln\u00e9ho oh\u00fdbac\u00edho lisu se za\u0159\u00edzen\u00edm s elastick\u00fdm horn\u00edm d\u00edlem lze vypo\u010d\u00edtat podle n\u00e1sleduj\u00edc\u00edho vzorce.<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">F <sub>lis<\/sub>&nbsp;= (1,1~1,2) (F<sub>Z<\/sub>+F<sub>D<\/sub>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ton\u00e1\u017e voln\u00e9ho oh\u00fdbac\u00edho lisu s pru\u017en\u00fdm lisovac\u00edm za\u0159\u00edzen\u00edm lze vypo\u010d\u00edtat podle n\u00e1sleduj\u00edc\u00edho vzorce.<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">F<sub>&nbsp;lis<\/sub>&nbsp;= (1,1~1,2) (F<sub>Z<\/sub>+F<sub>Y<\/sub>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ton\u00e1\u017e korek\u010dn\u00edho oh\u00fdbac\u00edho lisu lze vypo\u010d\u00edtat podle n\u00e1sleduj\u00edc\u00edho vzorce.<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">F <sub>lis<\/sub>&nbsp;\u2265 (1,1~1,2) F<sub>J<\/sub><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ve vzorci F <sub>lis<\/sub>&nbsp;&nbsp;se naz\u00fdv\u00e1 tlak, N.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Vyrobitelnost oh\u00fdban\u00fdch d\u00edl\u016f<\/strong><strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Vyrobitelnost oh\u00fdban\u00e9ho d\u00edlu se t\u00fdk\u00e1 p\u0159izp\u016fsobivosti oh\u00fdban\u00e9ho d\u00edlu procesu oh\u00fdb\u00e1n\u00ed, co\u017e je procesn\u00ed po\u017eadavek pro n\u00e1vrh oh\u00fdban\u00e9ho v\u00fdrobku z \u00fahlu procesu oh\u00fdb\u00e1n\u00ed. Oh\u00fdban\u00e9 d\u00edly s dobrou vyrobitelnost\u00ed mohou nejen zjednodu\u0161it proces oh\u00fdb\u00e1n\u00ed a konstrukci oh\u00fdbac\u00edho n\u00e1stroje, ale tak\u00e9 zlep\u0161it p\u0159esnost oh\u00fdban\u00fdch d\u00edl\u016f, \u0161et\u0159it materi\u00e1ly a zlep\u0161it efektivitu v\u00fdroby.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Polom\u011br ohybu<\/strong><strong><\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Polom\u011br ohybu oh\u00fdban\u00e9 \u010d\u00e1sti by nem\u011bl b\u00fdt men\u0161\u00ed ne\u017e minim\u00e1ln\u00ed polom\u011br ohybu, jinak bude ohnut v\u00edcekr\u00e1t, \u010d\u00edm\u017e se zv\u00fd\u0161\u00ed po\u010det proces\u016f; nem\u011bl by b\u00fdt p\u0159\u00edli\u0161 velk\u00fd, proto\u017ee p\u0159esnost \u00fahlu ohybu a polom\u011bru ohybu nen\u00ed snadn\u00e9 zaru\u010dit z d\u016fvodu efektu odpru\u017een\u00ed, kdy\u017e je p\u0159\u00edli\u0161 velk\u00fd.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Tvar ohnut\u00e9 \u010d\u00e1sti<\/strong><strong><\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Tvar oh\u00fdban\u00e9ho d\u00edlu by m\u011bl b\u00fdt co nejjednodu\u0161\u0161\u00ed a symetrick\u00fd doleva a doprava, aby se zajistilo, \u017ee polotovar b\u011bhem oh\u00fdb\u00e1n\u00ed neklou\u017ee a nezp\u016fsobuje p\u0159esazen\u00ed, \u010d\u00edm\u017e se ovlivn\u00ed p\u0159esnost oh\u00fdban\u00e9ho d\u00edlu. Obr\u00e1zek 1-5 (a) ukazuje zamezen\u00ed klouz\u00e1n\u00ed, kdy\u017e je polotovar ohnut, a um\u00edst\u011bn\u00ed procesn\u00edho otvoru je p\u0159id\u00e1no do n\u00e1vrhu. Zb\u00fdvaj\u00edc\u00ed \u010d\u00e1sti na obr\u00e1zku 1-5 (b), (c) jsou zn\u00e1zorn\u011bny na mal\u00fdch asymetrick\u00fdch oh\u00fdbac\u00edch \u010d\u00e1stech s pou\u017eit\u00edm p\u00e1ru oh\u00fdb\u00e1n\u00ed a n\u00e1sledn\u00e9ho \u0159ez\u00e1n\u00ed.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"600\" height=\"178\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-5.jpg\" alt=\"Obr\u00e1zek 1-5 Tvar d\u011brovan\u00fdch oh\u00fdban\u00fdch d\u00edl\u016f\" class=\"wd-lazy-fade wp-image-2617\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-5.jpg 600w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-5-300x89.jpg 300w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-5-18x5.jpg 18w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-5-150x45.jpg 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption>Obr\u00e1zek 1-5 Tvar oh\u00fdban\u00e9ho d\u00edlu<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">U zak\u0159iven\u00fdch d\u00edl\u016f se z\u00e1\u0159ezy, pokud jsou z\u00e1\u0159ezy vyra\u017eeny jako prvn\u00ed, dojde k vidlici a ve v\u00e1\u017en\u00fdch p\u0159\u00edpadech se nemus\u00ed ani vytvo\u0159it. Proto by m\u011bl b\u00fdt z\u00e1\u0159ez nejprve ponech\u00e1n jako spojovac\u00ed p\u00e1s a pot\u00e9 po ohnut\u00ed od\u0159\u00edznut, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-6 (a).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">U obrobk\u016f se z\u00e1\u0159ezy a ohyby by m\u011bla b\u00fdt ohnut\u00e1 \u010d\u00e1st obecn\u011b vytvo\u0159ena jako lichob\u011b\u017en\u00edk pro snadn\u00e9 vyhozen\u00ed. M\u016f\u017eete tak\u00e9 nejprve vyrazit obvodovou dr\u00e1\u017eku a pot\u00e9 ji ohnout do tvaru, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-6(b).<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-6.jpg\" alt=\"Obr\u00e1zek 1-6 Zak\u0159iven\u00e9 d\u00edly se z\u00e1\u0159ezy a \u0159ezy\" class=\"wd-lazy-fade wp-image-2618\" width=\"600\" height=\"268\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-6.jpg 600w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-6-150x67.jpg 150w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-6-300x134.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption>Obr\u00e1zek 1-6 Zak\u0159iven\u00e9 d\u00edly se z\u00e1\u0159ezy a \u0159ezy<\/figcaption><\/figure><\/div>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>V\u00fd\u0161ka rovn\u00e9 hrany oh\u00fdban\u00e9 \u010d\u00e1sti<\/strong> podle <a href=\"https:\/\/harslepress.com\/cs\/product\/100t-punching-machine-steel-hinge-making-automatic-power-press-production-line-foil-container-making-machine\/\">power press<\/a><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">P\u0159i oh\u00fdb\u00e1n\u00ed do prav\u00e9ho \u00fahlu by v\u00fd\u0161ka rovn\u00e9 strany oh\u00fdban\u00e9ho kusu nem\u011bla b\u00fdt p\u0159\u00edli\u0161 mal\u00e1. Pokud je v\u00fd\u0161ka rovn\u00e9 hrany oh\u00fdban\u00e9ho d\u00edlu p\u0159\u00edli\u0161 mal\u00e1, d\u00e9lka podep\u0159en\u00e1 rovn\u00fdm okrajem na form\u011b je p\u0159\u00edli\u0161 kr\u00e1tk\u00e1 a b\u011bhem procesu oh\u00fdb\u00e1n\u00ed nelze vytvo\u0159it dostate\u010dn\u00fd ohybov\u00fd moment a nelze zaru\u010dit rovn\u00fd okraj oh\u00fdban\u00e9ho d\u00edlu . Proto mus\u00ed b\u00fdt rovn\u00e1 hrana oh\u00fdban\u00e9ho d\u00edlu provedena rovn\u011b. V\u00fd\u0161ka hrany h&gt;r+2t, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-7 (a). Pokud h &lt;r+2t, you need to slot and then bend or increase the height of the straight edge first, and then cut off the excess part after bending, as shown in Figure 1-7 (b). When the bent side has a beveled bending part, it is impossible to bend to the required angle in the area where the bevel height is less than r+2t, and the place is also easy to crack, as shown in Figure 1-7 (c) , So it is necessary to change the shape of the workpiece and increase the height of the straight edge, as shown in Figure 1-7 (d).<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"600\" height=\"511\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-7-1.jpg\" alt=\"\" class=\"wd-lazy-fade wp-image-2668\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-7-1.jpg 600w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-7-1-150x128.jpg 150w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-7-1-300x256.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption>Obr\u00e1zek 1-7 V\u00fd\u0161ka rovn\u00e9 hrany oh\u00fdban\u00e9ho d\u00edlu&nbsp;<\/figcaption><\/figure><\/div>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Okraj otvoru oh\u00fdban\u00e9ho d\u00edlu<\/strong><strong><\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Pokud se p\u0159i oh\u00fdb\u00e1n\u00ed obrobku s otvory nach\u00e1z\u00ed otvor v bl\u00edzkosti oblasti ohybu, dojde po ohnut\u00ed k deformaci tvaru otvoru. Aby se zabr\u00e1nilo t\u00e9to z\u00e1vad\u011b, mus\u00ed b\u00fdt otvor mimo deforma\u010dn\u00ed z\u00f3nu, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-8 (a). Vzd\u00e1lenost l od okraje otvoru ke st\u0159edu polom\u011bru ohybu r je: kdy\u017e t&lt;2mm, l\u2265t; kdy\u017e t\u22652 mm, l\u22652t.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"600\" height=\"173\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-8.jpg\" alt=\"Obr\u00e1zek 1-8 Okraje otvor\u016f oh\u00fdban\u00fdch d\u00edl\u016f\" class=\"wd-lazy-fade wp-image-2620\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-8.jpg 600w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-8-300x87.jpg 300w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-8-18x5.jpg 18w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-8-150x43.jpg 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption>Obr\u00e1zek 1-8 Okraje otvor\u016f oh\u00fdban\u00fdch d\u00edl\u016f<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Pokud je vzd\u00e1lenost od okraje otvoru ke st\u0159edu polom\u011bru ohybu r p\u0159\u00edli\u0161 mal\u00e1, aby splnila v\u00fd\u0161e uveden\u00e9 podm\u00ednky, je pot\u0159eba otvor p\u0159ed d\u011brov\u00e1n\u00edm ohnout a vytvarovat.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pokud to struktura obrobku umo\u017e\u0148uje, m\u016f\u017ee b\u00fdt procesn\u00ed otvor p\u0159edem vyra\u017een v ohybu, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-8 (b), nebo je vyhrazena procesn\u00ed \u0161t\u011brbina, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-8 (c), kter\u00fd je absorbov\u00e1n procesn\u00edm otvorem nebo dr\u00e1\u017ekou Deforma\u010dn\u00ed nap\u011bt\u00ed v ohybu zabra\u0148uje deformaci otvoru p\u0159i jeho oh\u00fdb\u00e1n\u00ed.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Struktura obrobku, aby se zabr\u00e1nilo prasklin\u00e1m na ohnut\u00e9m ko\u0159eni<\/strong><strong><\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Kdy\u017e je ur\u010dit\u00fd segment okraje lok\u00e1ln\u011b ohnut\u00fd, aby se zabr\u00e1nilo roztr\u017een\u00ed ohnut\u00e9ho ko\u0159ene, m\u011bla by b\u00fdt d\u00e9lka neohnut\u00e9 \u010d\u00e1sti zkr\u00e1cena tak, aby vych\u00e1zela z ohybov\u00e9 linie, tj. b\u2265r, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-9 (A). Pokud d\u00e9lku obrobku nelze zkr\u00e1tit, m\u011bla by se mezi ohnutou \u010d\u00e1st\u00ed a neohnutou \u010d\u00e1st\u00ed vy\u0159\u00edznout dr\u00e1\u017eka, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-9 (b), nebo by se m\u011bl procesn\u00ed otvor p\u0159ed oh\u00fdb\u00e1n\u00edm vyrazit, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-9 (c) Zobrazeno.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"600\" height=\"189\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-9.jpg\" alt=\"Obr\u00e1zek 1-9 Struktura obrobku, aby se zabr\u00e1nilo prasklin\u00e1m na ohnut\u00e9m ko\u0159eni d\u011brov\u00e1n\u00ed\" class=\"wd-lazy-fade wp-image-2621\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-9.jpg 600w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-9-300x95.jpg 300w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-9-18x6.jpg 18w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-9-150x47.jpg 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption>Obr\u00e1zek 1-9 Struktura obrobku, aby se zabr\u00e1nilo prasklin\u00e1m na ohnut\u00e9m ko\u0159eni<\/figcaption><\/figure><\/div>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Zv\u011bt\u0161ete procesn\u00ed mezery, dr\u00e1\u017eky a procesn\u00ed otvory<\/strong><strong><\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">U oh\u00fdban\u00fdch d\u00edl\u016f s deformac\u00ed na stran\u011b zaoblen\u00e9 deforma\u010dn\u00ed z\u00f3ny b\u011bhem oh\u00fdb\u00e1n\u00ed lze pro zlep\u0161en\u00ed rozm\u011brov\u00e9 p\u0159esnosti oh\u00fdban\u00fdch d\u00edl\u016f p\u0159edem vy\u0159\u00edznout procesn\u00ed z\u00e1\u0159ezy nebo dr\u00e1\u017eky na obou konc\u00edch ohybov\u00e9 linie, aby se zabr\u00e1nilo vlivu zkreslen\u00ed na \u0161\u00ed\u0159ku oh\u00fdban\u00fdch \u010d\u00e1st\u00ed, nap\u0159. Jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-10.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"600\" height=\"386\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-10.jpg\" alt=\"Obr\u00e1zek 1-10 Metoda eliminace ohybov\u00e9ho zkreslen\u00ed\" class=\"wd-lazy-fade wp-image-2622\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-10.jpg 600w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-10-150x97.jpg 150w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-10-300x193.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption>Obr\u00e1zek 1-10 Metoda eliminace ohybov\u00e9ho zkreslen\u00ed<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Kdy\u017e je t\u0159eba ohnout okraj obrobku lok\u00e1ln\u011b, aby se zabr\u00e1nilo deformac\u00edm a prasklin\u00e1m zp\u016fsoben\u00fdm nerovnom\u011brnou silou na ohnut\u00e9 rohy, m\u011bly by b\u00fdt p\u0159edem vy\u0159\u00edznuty dr\u00e1\u017ekovac\u00ed nebo d\u011brovac\u00ed otvory, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 1-11. Mezi nimi hloubka procesn\u00ed dr\u00e1\u017eky L\u2265r+t+K\/2, \u0161\u00ed\u0159ka procesn\u00ed dr\u00e1\u017eky K\u2265t a pr\u016fm\u011br procesn\u00edho otvoru d\u2265t.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"600\" height=\"242\" src=\"https:\/\/harslepress.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-11.jpg\" alt=\"Obr\u00e1zek 1-11 Ohnut\u00e9 \u010d\u00e1sti p\u0159edd\u011brovan\u00fdch dr\u00e1\u017eek\" class=\"wd-lazy-fade wp-image-2623\" srcset=\"\" data-srcset=\"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-11.jpg 600w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-11-300x121.jpg 300w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-11-18x7.jpg 18w, https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u56fe1-11-150x61.jpg 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption>Obr\u00e1zek 1-11 Ohnut\u00e9 \u010d\u00e1sti p\u0159edd\u011brovan\u00fdch dr\u00e1\u017eek<\/figcaption><\/figure><\/div>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>P\u0159esnost oh\u00fdb\u00e1n\u00ed d\u00edl\u016f<\/strong> podle <a href=\"https:\/\/harslepress.com\/cs\/product\/100t-punching-machine-steel-hinge-making-automatic-power-press-production-line-foil-container-making-machine\/\">d\u011brovac\u00ed stroj<\/a><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">P\u0159esnost oh\u00fdban\u00e9ho d\u00edlu se t\u00fdk\u00e1 p\u0159edev\u0161\u00edm p\u0159esnosti a stability jeho tvaru a velikosti. P\u0159esnost oh\u00fdban\u00e9ho d\u00edlu je ovlivn\u011bna faktory, jako jsou mechanick\u00e9 vlastnosti plo\u0161n\u00e9ho materi\u00e1lu, tlou\u0161\u0165ka, struktura formy, p\u0159esnost formy, po\u010det postup\u016f, posloupnost postup\u016f a tvar a velikost samotn\u00e9ho obrobku. Obecn\u011b \u0159e\u010deno, \u00farove\u0148 ekonomick\u00e9 tolerance oh\u00fdban\u00fdch d\u00edl\u016f je pod \u00farovn\u00ed IT13. <\/p>","protected":false},"excerpt":{"rendered":"<p>Calculation of unfolded dimensions of bent parts by punch Determination of the position of the curved neutral layer The bent<\/p>","protected":false},"author":4,"featured_media":2624,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[691,693,694,692],"class_list":["post-2608","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-punching-machine","tag-bending-parts-by-punch","tag-punch-bending-force-calculation","tag-punch-bending-parts-accuracy","tag-punch-bending-parts-size"],"jetpack_featured_media_url":"https:\/\/harslepress.com\/wp-content\/uploads\/2021\/06\/\u4e3b\u56fe6.7.png","_links":{"self":[{"href":"https:\/\/harslepress.com\/cs\/wp-json\/wp\/v2\/posts\/2608","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/harslepress.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/harslepress.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/harslepress.com\/cs\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/harslepress.com\/cs\/wp-json\/wp\/v2\/comments?post=2608"}],"version-history":[{"count":0,"href":"https:\/\/harslepress.com\/cs\/wp-json\/wp\/v2\/posts\/2608\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/harslepress.com\/cs\/wp-json\/wp\/v2\/media\/2624"}],"wp:attachment":[{"href":"https:\/\/harslepress.com\/cs\/wp-json\/wp\/v2\/media?parent=2608"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/harslepress.com\/cs\/wp-json\/wp\/v2\/categories?post=2608"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/harslepress.com\/cs\/wp-json\/wp\/v2\/tags?post=2608"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}