Jakunkuna na hannu gabaɗaya ana yin su da takarda mai inganci da inganci, takarda kraft, farin kwali mai rufi, takarda farantin karfe, farin kwali, da sauransu. Ana amfani da su sosai a cikin marufi na kaya kamar su tufafi, abinci, takalma, kyaututtuka, taba da barasa, da magunguna. A lokacin amfani da jakunkuna, sau da yawa ana samun matsala na tsagewa a ƙasa ko gefen hatimin jakar, wanda ke da matukar tasiri ga rayuwar hidimar jakar takarda da nauyi da adadin abubuwan da za ta iya ɗauka. Lamarin fashewa a cikin hatimin buhunan takarda da ke hannun hannu yana da alaƙa da ƙarfin mannewa. Yana da mahimmanci musamman don ƙayyade ƙarfin mannewa na rufe buhunan takarda da hannu ta hanyar fasahar gwaji.
Ƙarfin mannewa na jakunkuna na hannu an ƙayyade musamman a cikin QB/T 4379-2012, yana buƙatar ƙarfin mannewa wanda bai gaza 2.50KN/m ba. Ƙarfin mannewa mai rufewa za a ƙayyade ta hanyar madaidaiciyar saurin gudu a cikin GB / T 12914. Ɗauki jaka biyu na samfurin kuma gwada samfurori 5 daga ƙananan ƙarshen jaka da gefe. Lokacin yin samfur, yana da kyau a sanya yankin haɗin kai a tsakiyar samfurin. Lokacin da hatimin ya ci gaba kuma kayan ya karye, an bayyana ƙarfin rufewa azaman ƙarfin juzu'i na kayan a lokacin karaya. Yi ƙididdige ma'anar lissafin samfuran 5 a ƙananan ƙarshen da samfuran 5 a gefe, kuma ɗauki ƙasan biyun azaman sakamakon gwaji.
Ƙarfin mannewa shine ƙarfin da ake buƙata don karya hatimin wani nisa. Wannan kayan aiki yana ɗaukar tsari na tsaye, kuma an daidaita ma'auni don samfurin tare da ƙananan ƙuƙwalwa. Matsi na sama mai motsi ne kuma an haɗa shi zuwa firikwensin ƙimar ƙarfi. A lokacin gwajin, ana manne ƙarshen ƙarshen samfurin biyu na kyauta a cikin manyan maƙallan sama da na ƙasa, kuma ana cire samfurin ko kuma a shimfiɗa shi a wani takamaiman gudu. Ƙarfin firikwensin yana rikodin ƙimar ƙarfin a ainihin lokacin don samun ƙarfin mannewa na samfurin.
1. Samfur
Ɗauki jakunkuna samfurin guda biyu kuma gwada samfurori 5 daga ƙarshen kowane jaka da gefen ƙasa. Nisa samfurin ya zama 15 ± 0.1mm kuma tsawon ya zama aƙalla 250mm. Lokacin yin samfur, yana da kyau a sanya manne a tsakiyar samfurin.
2. Saita sigogi
(1) Saita saurin gwaji zuwa 20 ± 5mm / min; (2) Sanya nisa samfurin zuwa 15mm; (3) An saita tazara tsakanin ƙuƙumman zuwa 180mm.
3. Sanya samfurin
Ɗauki ɗaya daga cikin samfuran kuma maƙalla ƙarshen samfurin tsakanin manyan maƙallan sama da na ƙasa. Kowane matse ya kamata da ƙarfi danne cikakken faɗin samfurin tare da madaidaiciyar layi ba tare da lalacewa ko zamewa ba.
4. Gwaji
Danna maɓallin 'sake saiti' don sake saitawa kafin gwaji. Danna maɓallin "Test" don fara gwajin. Kayan aiki yana nuna ƙimar ƙarfi a ainihin lokacin. Bayan an gama gwajin, za a sake saita matsi na sama kuma allon yana nuna sakamakon gwajin ƙarfin mannewa. Maimaita matakai na 3 da 4 har sai an gwada dukkan samfurori 5. Latsa maɓallin "Kididdiga" don nuna sakamakon ƙididdiga, wanda ya haɗa da matsakaita, matsakaicin, mafi ƙaranci, daidaitaccen karkata, da ƙididdiga na bambancin ƙarfin mannewa.
5. Sakamakon gwaji
Yi ƙididdige ma'anar lissafin samfuran 5 a ƙananan ƙarshen da samfuran 5 a gefe, kuma ɗauki ƙasan biyun azaman sakamakon gwaji.
Kammalawa: Ƙarfin mannewa na hatimin jakar takarda da aka yi da hannu shine muhimmin abu wanda ke ƙayyade ko yana da wuya a yi amfani da shi. Har zuwa wani matsayi, yana ƙayyade nauyi, yawa, da rayuwar sabis na samfurin wanda jakar takarda ta hannun hannu zata iya jurewa, don haka dole ne a ɗauka da gaske.
Lokacin aikawa: Yuli-31-2024