Deg roughness yog ib qho tseem ceeb tshwj xeeb rau ntau yam khoom thiab cov khoom, tshwj xeeb tshaj yog cov uas yuav tsum tau muaj kev sib cuag nrog lwm qhov chaw. Hauv kev tsim khoom thiab kev tsim vaj tsev, qhov roughness feem ntau yog ntsuas hauv micrometers (μm) lossis microinches (μin), nrog cov nqi qis dua qhia qhov chaw smoother. Txawm li cas los xij, tsis muaj tus qauv thoob ntiaj teb rau qhov yuav tsum tau ua ntawm qhov roughness, thiab cov qib tsim nyog ntawm smoothness tuaj yeem sib txawv nyob ntawm daim ntawv thov thiab kev lag luam.
Ib qho qauv rau qhov roughness saum npoo yog tus nqi Ra, uas ntsuas qhov nruab nrab qhov sib txawv ntawm qhov chaw los ntawm txoj kab nruab nrab. Piv txwv li, yog tias qhov chaw muaj tus nqi Ra ntawm {{0}}.2 μm, qhov no txhais tau hais tias qhov nruab nrab ntawm qhov nruab nrab ntawm lub ncov thiab hav ntawm qhov chaw yog 0.2 μm. Rau qee qhov kev siv, xws li kev tsim khoom semiconductor lossis precision machining, qhov tsawg Ra qhov tseem ceeb yog tsim nyog los xyuas kom meej cov khoom ua haujlwm zoo. Nyob rau hauv sib piv, lwm yam kev siv, xws li hniav coatings los yog tej yam bearings, tej zaum yuav zam siab dua Ra tus nqi.
Lwm qhov tseem ceeb uas tuaj yeem cuam tshuam qhov kev xav tau ntawm qhov roughness yog cov khoom siv. Piv txwv li, cov hlau feem ntau nyuaj dua kom ua tiav qhov ua tiav zoo dua li cov yas lossis ceramics. Qhov no yog vim lub zog ntawm cov ntaub ntawv, xws li lawv hardness thiab ductility, nrog rau cov machining txoj kev siv.
Ntxiv rau Ra qhov tseem ceeb, muaj lwm yam kev ntsuas rau kev ntsuas qhov roughness uas yuav siv tau rau hauv qee qhov kev lag luam lossis kev siv. Piv txwv li, tus nqi Rz ntsuas qhov siab tshaj plaws-rau-kiv qhov siab ntawm qhov chaw, thaum tus nqi Rq suav tias yog lub hauv paus-txhais-square deviation. Lwm qhov kev ntsuas suav nrog qhov siab siab (Rp), qhov siab nruab nrab ntawm qhov siab-rau-qhov siab (Ry), thiab kurtosis (Rk).
Thaum kawg, qhov tsim nyog ntawm qhov roughness yuav tsum nyob ntawm cov khoom tshwj xeeb lossis cov khoom siv, nrog rau kev lag luam thiab daim ntawv thov uas nws yuav siv. Nws yog ib qho tseem ceeb uas yuav tau txiav txim siab txog yam xws li cov khoom siv thiab cov txheej txheem tsim khoom thaum txiav txim siab qhov tsim nyog roughness specifications. Tsis tas li ntawd, nws yuav muaj txiaj ntsig zoo rau kev sab laj nrog cov kws tshaj lij hauv thaj chaw lossis ua qhov kev sim kom ntseeg tau tias cov theem tsim nyog ntawm qhov smoothness tiav.
