Lub hardness ntawm granite yog ib qho tseem ceeb tshaj plaws uas dictates nws cov tswv yim siv, kev pab lub neej, thiab tag nrho cov kev ua tau zoo. Feem ntau hais tias siv Mohs lossis Shore hardness scales, cov kev ntsuas no ncaj qha cuam tshuam rau kev ua haujlwm nyuaj, hnav tsis kam, thiab qhov ruaj khov. Xaiv qhov zoo granite yuav tsum tau ua tib zoo xav txog kev npaj siv ib puag ncig.
Thaum lub sijhawm ua tiav, granite hardness plays lub luag haujlwm txiav txim siab. Softer granites nrog Mohs hardness ntawm 3-4 yog yooj yim dua rau txiav, zom, thiab xyaum, ua rau lawv zoo tagnrho rau complex-zoo li tus Cheebtsam xws li ntsuas hauv paus nrog grooves. Kev ua tau zoo tuaj yeem ncav cuag 40% siab dua piv rau cov pob zeb nyuaj. Txawm li cas los xij, softer granite nto yog feem ntau yuav khawb, thiab nyob rau hauv precision daim ntaub ntawv, ntev - siv sij hawm yuav ua rau flatness deviations ntau tshaj 0.02mm / m. Los ntawm qhov sib piv, siab -hardness granite nrog Mohs hardness ntawm 5-6 xav tau pob zeb diamond tooling, uas ua rau cov nqi ntau lawm los ntawm 20-30%, tab sis ua tiav qhov zoo tshaj plaws, feem ntau nrog roughness hauv qab Ra0.8μm. Qhov no ua rau nws tshwj xeeb tshaj yog haum rau siab -cov cuab yeej ntsuas thiab cov khoom siv.
Granite hardness kuj tseem cuam tshuam rau hnav thiab cuam tshuam tsis kam. Pob zeb nrog Shore hardness saum toj no 70HS muab qhov tshwj xeeb hnav tsis kam, tswj txhua xyoo hnav kom tsis pub dhau 0.01mm nyob rau hauv siab -kev tiv tauj ib puag ncig xws li tshuab cuab yeej qhia kev txhawb nqa, thiab txuas ntxiv kev pab cuam lub neej los ntawm peb mus rau tsib zaug piv rau ntau hom softer. Txawm li cas los xij, hardness siab dua sib cuam tshuam nrog nce brittleness; nyob rau hauv kev cuam tshuam loj heev, xws li granite tuaj yeem tawg, txwv nws siv hauv kev vibration- ib puag ncig yooj yim. Nruab nrab- mus rau qis-hardness granite, nrog Shore hardness ntawm 50–60HS, qhia ntau dua toughness thiab cuam tshuam resilience, ua rau nws zoo tagnrho rau cov chaw ua hauj lwm rooj tog los yog hauv paus uas yuav tsum tau nquag txav.
Precision tuav yog lwm qhov chaw uas hardness tseem ceeb. High- hardness granite nta cov qauv siv lead ua denser thiab qis thermal expansion coefficient (feem ntau Tsawg dua lossis sib npaug li 5 × 10⁻⁶ / degree), muab kev ruaj ntseg zoo txawm tias nyob hauv kev cob qhia nrog qhov kub thiab txias. Qhov no ua kom micron-theem precision hla lub sijhawm ntev. Softer granite, conversely, muaj kev cuam tshuam rau cov av noo thiab siab variations, ua rau me me deformations thiab txwv nws haum rau tsawg tseem ceeb daim ntaub ntawv xws li kev them nyiaj yug puag rau cov khoom siv dav dav. Tsis tas li ntawd, cov tawv tawv tawv tiv thaiv cov plua plav thiab cov roj sib sau ua ke, ua kom yooj yim txij nkawm thiab khaws cia kom raug.
Hauv kev xyaum, xaiv qhov tsim nyog granite hardness suav nrog kev sib npaug machinability, cuam tshuam tsis kam, thiab qhov xav tau precision. Rau siab -cov cuab yeej precision, granite nrog Mohs hardness ntawm 5 lossis siab dua yog pom zoo. Nruab nrab-hardness granite yog qhov zoo- haum rau ib puag ncig uas muaj kev cuam tshuam tsis tu ncua, thaum muaj ntau hom softer yuav raug xaiv rau cov khoom sib txawv, tsis sib xws uas yooj yim ntawm kev ua haujlwm yog qhov tseem ceeb. Kev xav zoo sib xws ntawm hardness parameters ua kom muaj kev ua tau zoo tshaj plaws, ua haujlwm ntev, thiab tus nqi - ua haujlwm tau zoo.