Abantu abaninzi abaqapheli ukuba kukho uvavanyo olungaphezulu kweyodwa
Ukubeka nje, uvavanyo lwe-Rockwell ubunzima yindlela yokulinganisa ubunzima bezinto. Isilinganisi sobunzima be-Rockwell silawulwa ngokubanzi ukubonakalisa ubunzima bezinyithi, ezifana nesinyithi esincinci, i-carbides enomsila, inkokheli, i-aluminium, i-zinc, i-alloys zethusi, i-titane, nentsimbi. Kodwa i-scale ilawulwa kwakhona ukuvavanya ezinye iiplastiki.
Ukunyameka, njengoko kulinganiswa ngesikali se-Rockwell, kubhekisela ekumanyeni ukungena.
Uvavanyo lufumana igama layo ku-Stanley P. Rockwell, owenzela uvavanyo kunye noomatshini bokuqala, kamva uthengisa amalungelo kubo. Uvavanyo luqale lwaqhutywa ngo-1919.
Uvavanyo lwe-Rockwell lobunzima lusebenza njani
Uvavanyo lwe-Rockwell ubunzima bokunyanzelanisa ubunzima ngendlela elula kakhulu: ngokuchukumisa umfaki wezinto eziphathekayo kwizinto eziphathekayo kunye nomthwalo othile kwaye ulinganisa indlela umthengi ayenako ukufikelela ngayo. Uninzi lwexesha, indenter yenziwa yintsimbi yensimbi okanye idayimane.
Kodwa, inyaniso, inyaniso iyinkimbinkimbi, kuba iisampuli zensimbi ziyahlukahluka kakhulu. Ngenxa yoko, indlela efanayo ayinakusetyenziswa kuwo onke amasampuli. Enyanisweni, kukho izicwangciso ezingama-30 ezihlukeneyo ze-Rockwell. Ngamnye usebenzisa umdibaniso ohlukeneyo wohlobo lweemvavanyo kunye neentlobo zabathengisi. Xa ukhetha isilinganisi esifanelekileyo kwisampuli yesinyithi, abavandlakanyi bajonga ubungakanani kunye nomlo wezinto zokuvavanya, i-homogeneity, kunye nokulinganiselwa kwesilinganiso ngasinye.
Nangona kukho iindidi zee-Rockwell, ezi ziqhelekileyo kwizixhobo ezinzima kakhulu ziyi-Rockwell kunye ne-Rockwell C. Xa izinto eziphathekayo zincinci, imithwalo ye-lightweight isetyenziswe: i-Rockwell 30T, i-1ST, i-Rockwell 15-N, kunye ne-30- I sikali. Njengoko unokubona kule miyinganiso, iinombolo ze-Rockwell zobunzima zibonisa isiqalo esichaza isiqingatha se-Rockwell esisetyenziselwa ukulungiswa kunye nokudibanisa umthwalo kunye ne-indenter.
Kukho iitshathi zokuguqula eziya kuvumela ukuguqulwa kwindlela enye yobunzima ukuya kwelinye, kodwa kufuneka kukhunjulwe ukuba ezi tshintshi zenguqu azikwazi ukuguqula ngokuthe ngqo ukusuka kwelinye ukuya kwelinye.
Uninzi lwabantu abakhangela iziphumo ezivela kwi-Rockwell ukunyamezela iimvavanyo aziqali ukuba iintlobo ezininzi zezikali ziyafumaneka. Ngaloo ndlela, abanakho ukuqonda ukuba iitshathi zenguqu ayilunganga ngokupheleleyo. Kungenxa yokuba izilinganiso ze-Rockwell azikho iiyunithi. Njengoko i-Sizes.com ichaza, "Isimboli i-HR ilandelwa ngetekisi ebonisa enye yezikali ezinokwenzeka. Ngokomzekelo, 'i-HRC 96' ithetha 96 kwisikhulu seR Rockwell."
Isilinganisi esifana nesiqilima se-Rockwell
Isilinganiselo se-Rockwell sifaniswa ne-Test Mohs kunye ne-Brinell. Isikratshi seBrellen senziwa nguNjineenjineli waseSweden u-Johann A. Brinell ngo-1910, kwaye isebenza ngale ndlela ilandelayo. Umthwalo usetyenziselwa kwibhola enqiniweyo yensimbi ehleli kwi-flat surface yesitrindi elindele ukuvavanywa. Emva koko, ububanzi beentente ezifomayo ziyahlolwa.
Ngokutsho kwe-Sizes.com, ubunzima bunzima ngolu hlobo: "Inombolo yeBrnell ebonisa ubunzima bensimbi yimi mthwalo kwibhola kwiikhilogram ezahlulwe yindawo ejikelezayo yelente kwiimitha eziyi-square."