Kuthetha ukuthini u-4.8 kunye no-8.8 kwiiBolts?
Ukumakishwa kwiibholithi, ezifana ne-4.8 kunye ne-8.8, kubonisa amabakala okusebenza kweebholithi ezisetyenziselwa ukudibanisa isakhiwo sentsimbi. La mabanga ahlelwe ngokwamanqanaba angaphezu kweshumi kuquka 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, no-12.9. Phakathi kwezi, iibholiti ezifakwe kwi-8.8 nangaphezulu zenziwe ngentsimbi ephantsi kwe-carbon alloy okanye i-medium-carbon steel eye yafumana unyango lobushushu (ukucima kunye nokushisa), okubizwa ngokuba yi-bolts high-high-power. Ezinye ziyaziwa ngokubanzi njengeebholiti eziqhelekileyo.
Ukumakishwa kwebakala lentsebenzo kukho iiseti ezimbini zamanani ezimele ixabiso lamandla e-tensile yesiqhelo kunye nomlinganiselo wesivuno ukuya kwi-tensile yemathiriyeli yebholithi. Umzekelo:
- Ibholithi enebakala lentsebenzo lika-4.8 ibonisa:
- Amandla okuzibamba okubizwa ngokuba yi-bolt material afikelela kwi-400 MPa;
- Umlinganiselo wesivuno-kwi-tensile ye-bolt material yi-0.8;
- Ngoko ke, amandla okuvunwa okubizwa ngokuba yi-bolt material yi-400 × 0.8 = 320 MPa.
- I-bolt yamandla aphezulu kunye nebakala lokusebenza kwe-10.9, emva kokunyanga kobushushu, inokufikelela:
- Amandla okuqina okubizwa ngokuba yi-bolt material afikelela kwi-1000 MPa;
- Umlinganiselo wesivuno-kwi-tensile ye-bolt material yi-0.9;
- Ngaloo ndlela, amandla okuvunwa okubizwa ngokuba yi-bolt material yi-1000 × 0.9 = 900 MPa.
Umgangatho wokusebenza weebholithi ngumgangatho owaziwayo kwihlabathi, oqinisekisa ukuba iibholithi zomgangatho ofanayo zisebenza ngokufanayo kungakhathaliseki ukuba zithini na okanye imvelaphi yazo, nto leyo evumela ukuba kukhethwe uyilo olusekelwe kuphela kwibakala lokusebenza.
Ngokumalunga nebakala lamandla, kufuneka kuqatshelwe ukuba oku kubizwa ngokuba ngamabakala 8.8 kunye ne-10.9 awabhekiseli kumanqanaba oxinzelelo lwe-shear ka-8.8 ne-10.9 GPa, kodwa kunoko:
- Kwibakala le-8.8, amandla okuzinza okuqhelekileyo ngama-800 N/mm², kwaye amandla aqhelekileyo esivuno ngama-640 N/mm².
Amandla ebholithi aboniswa ngokuqhelekileyo ngokuthi "XY", apho i-X100 ilingana nokuqina kwebholithi, kwaye i-X100*(Y/10) ilingana namandla esivuno sebholithi (ngokwendibano yokumakisha: amandla emveliso/amandla okuqina = Y/10).
Umzekelo, kwibakala 4.8 ibhawuthi:
- Amandla okuqina aya kuba yi-400 MPa;
- Amandla esivuno aya kuba ngama-400 * 8/10 = 320 MPa.
Ukongezelela, iibholiti zensimbi ezingenasici zihlala ziphawulwa njenge-A4-70 okanye i-A2-70, enentsingiselo eyahlukileyo kwimigangatho elawula i-fasteners yensimbi engenasici.
Enkosi ngokufunda, ukuba ufuna ukubona ngaphezulu koko sinokukunika ungalandela ezi linki zingezantsi!