{"id":9037,"date":"2025-06-23T09:53:58","date_gmt":"2025-06-23T09:53:58","guid":{"rendered":"https:\/\/sinoextrud.com\/?p=9037"},"modified":"2025-06-23T09:53:58","modified_gmt":"2025-06-23T09:53:58","slug":"jaky-je-limit-ohybu-pro-plochou-tyc-z-hliniku-7075","status":"publish","type":"post","link":"https:\/\/sinoextrud.com\/cs\/what-is-the-bending-limit-for-a-7075-aluminum-flat-bar\/","title":{"rendered":"Jak\u00fd je limit ohybu pro plochou ty\u010d z hlin\u00edku 7075?"},"content":{"rendered":"

\"Segment
Oh\u00fdb\u00e1n\u00ed siln\u00fdch hlin\u00edkov\u00fdch profil\u016f s \u0159\u00edzen\u00fdm polom\u011brem pro zabr\u00e1n\u011bn\u00ed vzniku trhlin v materi\u00e1lu 7075-T6<\/figcaption><\/figure>\n<\/p>\n

Mnohokr\u00e1t jsem oh\u00fdbal ploch\u00e9 ty\u010de 7075 pro leteck\u00e9 d\u00edly. Tato slitina je velmi pevn\u00e1, ale tak\u00e9 k\u0159ehk\u00e1. Nau\u010dil jsem se, \u017ee oh\u00fdb\u00e1n\u00ed ploch\u00fdch ty\u010d\u00ed 7075 vy\u017eaduje opatrnost a pl\u00e1nov\u00e1n\u00ed.<\/p>\n

Slitina 7075?T6 pat\u0159\u00ed k nejpevn\u011bj\u0161\u00edm hlin\u00edkov\u00fdm slitin\u00e1m, kter\u00e9 m\u016f\u017eete pou\u017e\u00edt, ale tato pevnost je na \u00fakor tvarovatelnosti. Abyste se vyhnuli prask\u00e1n\u00ed, pot\u0159ebujete spr\u00e1vn\u00fd polom\u011br ohybu, teplo, n\u00e1stroje a proces.<\/strong><\/p>\n

\n

1. Jak\u00e1 je mezn\u00ed hodnota ohybu pro plochou ty\u010d 7075?<\/h2>\n

Kdy\u017e mluv\u00edme o \"hranici ohybu\", m\u00e1me na mysli. minim\u00e1ln\u00ed vnit\u0159n\u00ed polom\u011br ohybu<\/strong> a n\u011bkdy i maxim\u00e1ln\u00ed \u00fahel ohybu<\/strong> m\u016f\u017eete dos\u00e1hnout, ani\u017e by do\u0161lo k prasknut\u00ed.<\/p>\n

    \n
  • Minim\u00e1ln\u00ed polom\u011br ohybu<\/strong> je nejt\u011bsn\u011bj\u0161\u00ed vnit\u0159n\u00ed k\u0159ivka, kterou m\u016f\u017eete vytvo\u0159it. <\/li>\n
  • Maxim\u00e1ln\u00ed \u00fahel ohybu<\/strong> se obvykle uv\u00e1d\u00ed pro standardn\u00ed ohyb 90\u00b0 nebo 180\u00b0.<\/li>\n<\/ul>\n

    U materi\u00e1lu 7075?T6 se minim\u00e1ln\u00ed polom\u011br pohybuje p\u0159ibli\u017en\u011b v rozmez\u00ed. 1,5\u00d7 a\u017e 2\u00d7 tlou\u0161\u0165ka materi\u00e1lu<\/strong> pro tenk\u00e9 plechy nebo tenk\u00e9 ploch\u00e9 ty\u010de. U siln\u011bj\u0161\u00edch ty\u010d\u00ed (nad cca 6?mm nebo 0,25\") se pot\u0159ebn\u00fd polom\u011br v\u00fdrazn\u011b zv\u011bt\u0161uje - a\u017e na 0,25\". 7\u00d7 a\u017e 12\u00d7 v\u011bt\u0161\u00ed tlou\u0161\u0165ka<\/strong>, v z\u00e1vislosti na teplot\u011b a postupu.<\/p>\n

    Nap\u0159\u00edklad: pokud pou\u017e\u00edv\u00e1te materi\u00e1l 7075?T6 o tlou\u0161\u0165ce 0,5\" (12,7?mm), vnit\u0159n\u00ed polom\u011br ohybu by m\u011bl b\u00fdt. alespo\u0148 3,5\" (\u22487\u00d7t)<\/strong>. Pokud je t\u011bsn\u011bj\u0161\u00ed, obvykle se objev\u00ed praskliny.<\/p>\n

    \n

    2. Jak se m\u011b\u0159\u00ed mez ohybu?<\/h2>\n

    Mezn\u00ed hodnoty ohybu se obvykle m\u011b\u0159\u00ed a ur\u010duj\u00ed pomoc\u00ed dvou parametr\u016f:<\/p>\n

      \n
    1. Polom\u011br vnit\u0159n\u00edho ohybu (R)<\/strong> - vnit\u0159n\u00ed polom\u011br v m\u00edst\u011b ohybu kovu. <\/li>\n
    2. Tlou\u0161\u0165ka materi\u00e1lu (t)<\/strong> - \u010dasto vyjad\u0159ov\u00e1ny v pom\u011brech (nap\u0159. R \u2265 7?t).<\/li>\n<\/ol>\n

      Pro d\u016fkladn\u00fd v\u00fdpo\u010det:<\/p>\n

        \n
      • R = k \u00d7 t<\/strong> kde k<\/em> je faktor z\u00e1visl\u00fd na slitin\u011b, popu\u0161t\u011bn\u00ed a metod\u011b.\n
          \n
        • Tenk\u00fd plech v T6: k<\/em> ~ 1,5 a\u017e 2 <\/li>\n
        • Tlust\u00e1 ploch\u00e1 ty\u010d T6: k<\/em> ~ 7 a\u017e 12<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

          Alternativou jsou tabulky ze zdroj\u016f, jako je Aircraft Extrusion, kter\u00e9 uv\u00e1d\u011bj\u00ed \"tlou\u0161\u0165ka vs. minim\u00e1ln\u00ed polom\u011br\" v palc\u00edch nebo mm.<\/p>\n

          \n

          3. Jak\u00e9 faktory ovliv\u0148uj\u00ed mez ohybu?<\/h2>\n

          O tom, jak siln\u011b lze plochou ty\u010d 7075 ohnout, ani\u017e by do\u0161lo k jej\u00edmu prasknut\u00ed, rozhoduje mnoho prom\u011bnn\u00fdch:<\/p>\n

          - Teplota materi\u00e1lu<\/h3>\n
            \n
          • T6 \/ T651<\/strong> jsou vrcholov\u00e9 temperamenty s n\u00edzk\u00e1 ta\u017enost<\/strong>, n\u00e1chyln\u00e9 k prask\u00e1n\u00ed p\u0159i men\u0161\u00edch polom\u011brech. <\/li>\n
          • M\u00edrn\u011bj\u0161\u00ed povahy jako T0 \/ T4 \/ T42<\/strong> maj\u00ed v\u011bt\u0161\u00ed ta\u017enost, ale men\u0161\u00ed pevnost. <\/li>\n
          • Tepeln\u00e9 m\u011bk\u010den\u00ed (nap\u0159. retrogrese nebo roztok + op\u011btovn\u00e9 st\u00e1rnut\u00ed) zlep\u0161uje ohybatelnost.<\/li>\n<\/ul>\n

            - Tlou\u0161\u0165ka<\/h3>\n

            Siln\u011bj\u0161\u00ed materi\u00e1ly vy\u017eaduj\u00ed v\u011bt\u0161\u00ed polom\u011bry ohybu. Mez ohybu se zvy\u0161uje p\u0159\u00edmo \u00fam\u011brn\u011b s tlou\u0161\u0165kou.<\/p>\n

            - Metoda ohybu<\/h3>\n
              \n
            • Oh\u00fdb\u00e1n\u00ed za studena<\/strong> udr\u017euje v\u0161e p\u0159i pokojov\u00e9 teplot\u011b - nejv\u00edce n\u00e1chyln\u00e9 k prasknut\u00ed. <\/li>\n
            • Tepl\u00e9 oh\u00fdb\u00e1n\u00ed<\/strong> (60-200?\u00b0C) pom\u00e1h\u00e1 zm\u00edrnit nap\u011bt\u00ed a umo\u017e\u0148uje pevn\u011bj\u0161\u00ed ohyby. <\/li>\n
            • Tepeln\u011b asistovan\u00e9 tv\u00e1\u0159en\u00ed<\/strong> (retrogrese) m\u016f\u017ee v\u00fdrazn\u011b zlep\u0161it ohybatelnost.<\/li>\n<\/ul>\n

              - N\u00e1stroje a nadm\u011brn\u00e9 oh\u00fdb\u00e1n\u00ed<\/h3>\n

              Pou\u017eit\u00ed odpov\u00eddaj\u00edc\u00edch trn\u016f a CNC \u0159\u00edzen\u00e9ho nadm\u011brn\u00e9ho ohybu + kompenzace zp\u011btn\u00e9ho r\u00e1zu v\u00fdrazn\u011b zlep\u0161uje v\u00fdsledky.<\/p>\n

              - Odrazov\u00fd m\u016fstek<\/h3>\n

              Materi\u00e1l 7075 m\u00e1 vysokou mez kluzu a modul pru\u017enosti, tak\u017ee zp\u011btn\u00fd r\u00e1z je v\u00fdznamn\u00fd. Mus\u00edte to zohlednit nadm\u011brn\u00fdm ohybem.<\/p>\n

              \n

              4. Jak\u00e9 jsou typick\u00e9 polom\u011bry ohybu?<\/h2>\n

              Zde jsou uvedeny re\u00e1ln\u00e9 hodnoty polom\u011bru ohybu v z\u00e1vislosti na tlou\u0161\u0165ce:<\/p>\n\n\n\n\n\n\n\n
              Tlou\u0161\u0165ka (t)<\/th>\nMinim\u00e1ln\u00ed vnit\u0159n\u00ed polom\u011br (R)<\/th>\nPozn\u00e1mky<\/th>\n<\/tr>\n<\/thead>\n
              0,5?mm - 0,25\u2033<\/td>\n~0.06\u2033-0.09\u2033 (\u22481.5?\u00d7-2?\u00d7?t)<\/td>\nPlech nebo tenk\u00e1 ploch\u00e1 deska<\/td>\n<\/tr>\n
              0,25\u2033-0,5\u2033 (6-12?mm)<\/td>\nR ~7?\u00d7?t a\u017e 12?\u00d7?t (~1,75\u2033-6\u2033)<\/td>\nStandard pro ty\u010d T6<\/td>\n<\/tr>\n
              >0,5\u2033 (13?mm+)<\/td>\nR \u2265 10?t<\/td>\nVyhn\u011bte se prask\u00e1n\u00ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              P\u0159\u00edklad<\/strong>: U 0,125\u2033 (3,2?mm) plechu 7075?T6 se v tabulk\u00e1ch ohyb\u016f \u010dasto uv\u00e1d\u00ed R = 0,31\u2033 (~2,5\u00d7t).<\/p>\n

              \n

              5. Jak se vyhnout prask\u00e1n\u00ed p\u0159i oh\u00fdb\u00e1n\u00ed?<\/h2>\n

              Hlavn\u00edm probl\u00e9mem modelu 7075 je prask\u00e1n\u00ed. Zde je n\u00e1vod, jak tomu zabr\u00e1nit:<\/p>\n

              A. Zvolte spr\u00e1vn\u00fd polom\u011br<\/h3>\n

              Dodr\u017eujte pokyny pro tabulky - nikdy neomezujte jejich objem v\u00edce, ne\u017e je povoleno.<\/p>\n

              B. Oh\u00fdb\u00e1n\u00ed za tepla nebo s tepelnou asistenc\u00ed<\/h3>\n
                \n
              • Zah\u0159\u00e1t\u00ed na 60-200?\u00b0C<\/strong> p\u0159ed ohybem nebo b\u011bhem n\u011bj. To m\u016f\u017ee sn\u00ed\u017eit v\u00fdskyt trhlin a pot\u0159ebn\u00fdch R. <\/li>\n
              • Retrogrese<\/strong>: Zvy\u0161te teplotu na ~250?\u00b0C + op\u011btovn\u00e9 st\u00e1rnut\u00ed pro kontrolovanou ohybatelnost.<\/li>\n<\/ul>\n

                C. Pre-Tempering<\/h3>\n

                Tvarujte v m\u011bkk\u00e9m stavu (O nebo T0), po oh\u00fdb\u00e1n\u00ed zest\u00e1rn\u011bte na T6. T\u00edm se dos\u00e1hne nejlep\u0161\u00edho pom\u011bru mezi ta\u017enost\u00ed a pevnost\u00ed.<\/p>\n

                D. Spr\u00e1vn\u00e9 n\u00e1stroje<\/h3>\n

                Pou\u017e\u00edvejte vysoce kvalitn\u00ed n\u00e1stroje s trny a kompenzac\u00ed zp\u011btn\u00e9ho r\u00e1zu. Zajist\u011bte, aby byl d\u00edl p\u0159i oh\u00fdb\u00e1n\u00ed omezen.<\/p>\n

                E. Tepeln\u00e9 zpracov\u00e1n\u00ed po ohybu<\/h3>\n

                Po ohnut\u00ed prove\u010fte op\u011btovn\u00e9 st\u00e1rnut\u00ed (T6 nebo T651), abyste obnovili pevnost. T\u00edm se vyhnete p\u0159etrv\u00e1vaj\u00edc\u00edm slab\u00fdm m\u00edst\u016fm.<\/p>\n

                F. Zku\u0161ebn\u00ed ohyby<\/h3>\n

                P\u0159ed plnou v\u00fdrobou v\u017edy vytvo\u0159te prototyp. Materi\u00e1l jako 7075 se m\u016f\u017ee li\u0161it, proto je testov\u00e1n\u00ed velmi d\u016fle\u017eit\u00e9.<\/p>\n

                \n

                6. Souhrnn\u00e1 tabulka kl\u00ed\u010dov\u00fdch bod\u016f<\/h2>\n\n\n\n\n\n\n\n\n\n
                Ot\u00e1zka<\/th>\nKl\u00ed\u010dov\u00e9 poznatky<\/th>\n<\/tr>\n<\/thead>\n
                Mez ohybu pro 7075<\/strong><\/td>\nR \u2265 1,5-2?\u00d7?t pro tenk\u00e9, 7-12?\u00d7?t pro siln\u00e9 ploch\u00e9 ty\u010de<\/td>\n<\/tr>\n
                Metoda m\u011b\u0159en\u00ed<\/strong><\/td>\nPom\u011br vnit\u0159n\u00edho polom\u011bru k tlou\u0161\u0165ce; tabulky z leteck\u00e9ho pr\u016fmyslu\/pr\u016fmyslu<\/td>\n<\/tr>\n
                Faktory ovliv\u0148uj\u00edc\u00ed limit<\/strong><\/td>\nTeplota, tlou\u0161\u0165ka, teplo, proces oh\u00fdb\u00e1n\u00ed, n\u00e1stroje, zp\u011btn\u00fd r\u00e1z<\/td>\n<\/tr>\n
                Typick\u00e9 polom\u011bry<\/strong><\/td>\nTenk\u00fd plech: Tlust\u00fd plech: 1,5-2?t; tlust\u00e1 ty\u010d: 0,5\u2033 bar \u2192 \u22653,5\u2033 R<\/td>\n<\/tr>\n
                Vyhn\u011bte se prask\u00e1n\u00ed<\/strong><\/td>\nTepl\u00e9\/retrogresivn\u00ed tv\u00e1\u0159en\u00ed, m\u011bk\u010d\u00ed p\u0159edtvarov\u00e1n\u00ed, spr\u00e1vn\u00e9 obr\u00e1b\u011bn\u00ed, op\u011btovn\u00e9 st\u00e1rnut\u00ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
                \n

                7. Doporu\u010den\u00ed pro re\u00e1ln\u00e9 pou\u017eit\u00ed<\/h2>\n
                  \n
                1. V\u017edy zkontrolujte temperaci materi\u00e1lu<\/strong> p\u0159ed pl\u00e1nov\u00e1n\u00edm ohybu. <\/li>\n
                2. M\u011b\u0159en\u00ed tlou\u0161\u0165ky<\/strong> p\u0159esn\u011b, pak zvolte doporu\u010den\u00fd n\u00e1sobek polom\u011bru \u2265. <\/li>\n
                3. Pro T6 se zam\u011b\u0159te na konzervativn\u00ed ohyby - u kritick\u00fdch d\u00edl\u016f preferujte 10?\u00d7?t. <\/li>\n
                4. Tepl\u00fd ohyb<\/strong> pokud je to mo\u017en\u00e9, aby se sn\u00ed\u017eilo riziko vzniku trhlin. <\/li>\n
                5. Z\u00e1le\u017e\u00ed na konstrukci n\u00e1stroj\u016f<\/strong>-z\u00edskat spr\u00e1vn\u00e9 trny a kompenzaci zp\u011btn\u00e9ho r\u00e1zu. <\/li>\n
                6. Pou\u017eit\u00ed st\u00e1rnut\u00ed po ohybu<\/strong> aby znovu nabyl pln\u00e9 s\u00edly. <\/li>\n
                7. Prototyp p\u0159ed v\u00fdrobou<\/strong>-test na \u0161rotu pro vylad\u011bn\u00ed procesu. <\/li>\n
                8. Zdokumentujte ka\u017ed\u00fd proces<\/strong>-teplota, \u00fahel ohybu, n\u00e1stroje pro opakovatelnost.<\/li>\n<\/ol>\n
                  \n

                  8. P\u0159\u00edklad osnovy procesu<\/h2>\n

                  \u0158ekn\u011bme, \u017ee pot\u0159ebujete ohnout plochou ty\u010d 7075?T6 o pr\u016fm\u011bru 0,5\u2033 (12?mm) pod \u00fahlem 90\u00b0:<\/p>\n

                    \n
                  • C\u00edl uvnit\u0159 R = 10?t = 120?mm (\u22484,7\u2033)<\/strong>. <\/li>\n
                  • Zah\u0159ejte materi\u00e1l v troub\u011b na ~150?\u00b0C. <\/li>\n
                  • Pou\u017eijte CNC oh\u00fdba\u010dku trn\u016f s naprogramovan\u00fdm nadm\u011brn\u00fdm ohybem. <\/li>\n
                  • Po ohnut\u00ed podr\u017ete, aby se uvolnilo nap\u011bt\u00ed, a pot\u00e9 nechte 24 hodin zr\u00e1t p\u0159i 120?\u00b0C. <\/li>\n
                  • P\u0159ed pou\u017eit\u00edm zkontrolujte, zda nejsou praskliny, a zm\u011b\u0159te rozm\u011bry.<\/li>\n<\/ul>\n
                    \n

                    9. Z\u00e1v\u011bre\u010dn\u00e9 my\u0161lenky<\/h2>\n

                    Oh\u00fdb\u00e1n\u00ed ploch\u00fdch ty\u010d\u00ed z hlin\u00edku 7075 je n\u00e1ro\u010dn\u00e1 pr\u00e1ce - ale d\u00e1 se zvl\u00e1dnout. Vy\u017eaduje respekt k jeho limit\u016fm a chytr\u00e9 in\u017een\u00fdrstv\u00ed:<\/p>\n

                      \n
                    • Zjist\u011bte, jak\u00fd je polom\u011br ohybu v z\u00e1vislosti na tlou\u0161\u0165ce. <\/li>\n
                    • Pou\u017e\u00edvejte spr\u00e1vnou teplotu a \u0159\u00edzen\u00fd oh\u0159ev. <\/li>\n
                    • Vsa\u010fte na spr\u00e1vn\u00e9 n\u00e1stroje a dodr\u017eujte pokyny pro odleh\u010den\u00ed. <\/li>\n<\/ul>\n

                      P\u0159i spr\u00e1vn\u00e9m proveden\u00ed z\u00edsk\u00e1te siln\u00e9, p\u0159esn\u011b oh\u00fdban\u00e9 d\u00edly pro pou\u017eit\u00ed v letectv\u00ed, stroj\u00edrenstv\u00ed a konstrukci. Pokud m\u00e1te specifick\u00fd profil, tlou\u0161\u0165ku nebo p\u0159\u00edpad d\u00edlu, r\u00e1d v\u00e1m pomohu p\u0159esn\u011b dimenzovat proces.<\/p>","protected":false},"excerpt":{"rendered":"

                      Bending thick aluminum profiles with controlled radius to prevent cracking in 7075-T6 I\u2019ve bent 7075 flat bars for aerospace parts many times. This alloy is very strong\u2014but also brittle. I learned the hard way that bending 7075 flat bars needs care and planning. 7075?T6 is among the strongest aluminum alloys you can use\u2014but that strength […]<\/p>\n","protected":false},"author":6,"featured_media":8510,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"none","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"both","_seopress_redirections_param":"","_seopress_redirections_type":301,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-9037","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-custom-mold"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/9037","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/comments?post=9037"}],"version-history":[{"count":0,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/9037\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media\/8510"}],"wp:attachment":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media?parent=9037"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/categories?post=9037"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/tags?post=9037"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}