A cikin dogon lokaci da suka gabata, mun ambaci teburin hira da kasashen waje zuwa Sinanci, amma yayin amfani, saboda abubuwan da ke tattare da sinadarai na kayan, fasahar sarrafa kayan aiki, girman nau'in samfurin da sauran dalilai da daidaiton kayan aunawa a cikin kasashe daban-daban, taurin kai da dangantakar jujjuyawar ƙarfi don kafa tushe da sarrafa bayanai yana nufin sun bambanta, mun gano cewa akwai babban bambanci tsakanin ƙimar canzawa daban-daban. Bugu da ƙari, babu ƙaƙƙarfan ma'auni, ƙasa daban-daban suna amfani da tebur na juyawa daban-daban, suna kawo rudani a cikin taurin ƙima da ƙarfin juyawa.
Tun daga shekarar 1965, binciken kimiyyar ilimin kimiya na kasar Sin da sauran raka'a sun kafa Brinell, Rockwell, Vickers da na sama na Rockwell hardness benchmarks da kuma tilasta dabi'u bisa adadi mai yawa na gwaje-gwaje da bincike na bincike, don gano alaƙar da ke tsakanin taurin iri-iri da ƙarfin ƙarfe na ƙarfe, ta hanyar tabbatar da samarwa. Haɓaka namu "baƙar taurin ƙarfe da ƙarfin juyawa tebur" wanda ya dace da jerin ƙarfe 9 kuma ba tare da la'akari da ƙimar ƙarfe ba. A cikin aikin tabbatarwa, fiye da raka'a 100 ne suka shiga, an yi amfani da samfurori fiye da 3,000, kuma an auna fiye da 30,000 bayanai.
Ana rarraba bayanan tabbatarwa daidai gwargwado a ɓangarorin biyu na jujjuyawar jujjuyawar, kuma sakamakon ya yi daidai da rarrabuwar al'ada, wato, waɗannan allunan jujjuya suna daidai da gaskiya da samuwa.
An kwatanta wa] annan alkaluman juzu'i a duniya da irin wannan teburi na jujjuyawar kasashe 10, kuma ma'aunin canjin da ake yi a kasarmu ya kai matsakaicin madaidaicin kimar canjin na kasashe daban-daban.
Lokacin aikawa: Maris 26-2024
