Txhua tus neeg uas tau siv sij hawm nyob rau hauv pem teb metrology tej zaum yuav hnov ib co version ntawm tib qhov kev sib cav: granite zoo dua li cam khwb cia hlau, cam khwb cia hlau yog pheej yig dua granite, thiab marble yeej zoo ib yam li granite lawm. Qhov kev thov kawg no yog qhov tsim nyog rau kev tshem tawm, vim tias nws tsis raug rau txoj hauv kev uas muaj teeb meem thaum koj tab tom caum micron - theem kam rau ua.
Pib nrog ceev, tsis yog nqi
Density is a rough proxy for how a material behaves under load and vibration, and it's where the marble-versus-granite confusion usually starts. Kev lag luam dub granite feem ntau khiav ib ncig ntawm 2,900-3,100 kg / m³ nyob ntawm qhov chaw txua txiag zeb thiab pob zeb hauv av. Marble, los ntawm qhov sib txawv, zaum qis dua - feem ntau nyob rau hauv 2,600–2,700 kg/m³ ntau yam - thiab muaj cov qauv crystalline txawv txawv: softer, ntau ntxeem tau, thiab ntau dua rau micro- cracking nyob rau hauv rov qab thermal cycling.
Qhov sib txawv ntawd zoo li kev kawm txog thaum koj tso ib qhotswj ntsuas tshuabnyob saum nws. Lub denser, ntau homogeneous pob zeb resists deformation zoo dua thiab rov qab mus rau nws qhov qub geometry ntau txhim khu kev qha tom qab lub load raug tshem tawm. Tshaj li ob peb txhiab lub voj voog, qhov sib xws yog qhov sib txawv ntawm lub phaj saum npoo uas tuav calibration rau xyoo thiab ib qho uas drifts.
Qhov no kuj yog vim li cas qhov teeb meem kev hloov pauv hauv cov saw hlau granite yog qhov teeb meem tiag tiag, tsis yog kev lag luam hais lus xwb. Marble yog pheej yig dua rau cov chaw txua txiag zeb thiab yooj yim dua rau tshuab, yog li nws qee zaus tau muag rau hauv daim ntawv thov qhov tseeb precision granite tau teev tseg. Cov neeg yuav khoom uas tsis thov cov ntaub ntawv pov thawj lossis kev txheeb xyuas qhov ntom ntom tsis muaj txoj hauv kev yooj yim los ntes qhov no kom txog rau thaum cov khoom siv uas lawv ua rau saum nws pib qhia cov txiaj ntsig tsis sib xws.
Qhov twg cam khwb cia hlau tseem yeej - thiab qhov twg nws tsis
Cam khwb cia hlau tsis yog ib txwm siv. Rau hnyav dav dav - lub hom phiaj tshuab cuab yeej txaj qhov twg thermal stability tsis yog qhov kev txhawj xeeb tseem ceeb, nws tseem yog qhov tsim nyog, tus nqi - xaiv tau zoo, thiab nws tshuab sai dua pob zeb. Nws qhov zoo yog to taub zoo: zoo damping, siab tawv, ntau xyoo ntawm cov cuab yeej thiab cov txheej txheem kev paub tom qab nws.
Qhov twg nws tawm tsam yog tus cwj pwm thermal. Cam khwb cia hlau muaj cov coefficient ntawm thermal expansion roughly ob npaug ntawm granite (ib ncig ntawm 10-12 x 10⁻⁶/℃piv rau 5-8 x 10⁻⁶/℃rau granite, nyob ntawm seb muaj pes tsawg leeg). Hauv huab cua- tswj kev ntsuas ntsuas qhov sib txawv yuav tsis muaj teeb meem ntau. Nyob rau hauv lub khw hauv pem teb nrog ob peb degrees ntawm txhua hnub kub viav vias, nws tuaj yeem qhia qhov ntsuas qhov yuam kev rau txhua yam uas yuav tsum tau muaj cov micron repeatability - cov khoom siv tshuaj xyuas semiconductor, chaw kho qhov muag kho qhov muag, laser ntsuas platforms.
cam khwb cia hlau kuj yog hlau nplaum thiab hluav taws xob conductive, uas txwv nws tawm rau tej yam semiconductor thiab electronics manufacturing chaw uas stray teb los yog conductive nto yog ib qho teeb meem. Granite yog inert nyob rau hauv ob qho tib si suav.
Kev vibration damping yog qhov tsis txaus ntseeg
Kev nruj tau txais kev saib xyuas feem ntau hauv cov ntawv spec, tab sis sab hauv damping - sai npaum li cas cov khoom absorbs thiab dissipates vibration zog es tsis xa nws - yog arguably tseem ceeb tshaj rau txhua yam ua sub-micron ua hauj lwm. Granite's crystalline, tsis yog -homogeneous sab hauv cov qauv ua kom muaj zog vibration zoo dua li cov lattice ntau dua ntawm cov hlau cam. Qhov ntawd yog ib feem ntawm vim li cas granite saum npoo daim hlau thiab lub hauv paus tshuab tseem nyob hauv CMM chav, wafer tshuaj xyuas chaw, thiab laser interferometry teeb, txawm tias qhov chaw cam khwb cia hlau yuav tsim nyog.
Ib daim ntawv txheeb xyuas rau cov neeg yuav khoom
Yog tias koj tab tom qhia txog lub hauv paus granite lossis phaj saum npoo thiab xav kom tsis txhob muaj teeb meem hloov marble, ob peb yam tsim nyog nug koj tus neeg muag khoom ncaj qha:
Cov ntaub ntawv pov thawj ntom ntom - tiag tiag dub granite yuav tsum txheeb xyuas hauv 2,900–3, 100+ kg / m³ ntau, tsis qis dua.
Flatness calibration traceable mus rau lub koom haum metrology hauv teb chaws, tsis yog hauv - ntsuas hauv tsev.
Cov ntaub ntawv thermal nthuav dav rau cov chaw txua txiag zeb tshwj xeeb, vim granite muaj pes tsawg leeg sib txawv los ntawm qhov chaw.
Surface hardness thiab porosity cov ntaub ntawv, tshwj xeeb tshaj yog rau cov ntawv thov uas muaj lub tshuab nqus tsev chucks lossis cua bearings, qhov porosity cuam tshuam rau kev ua haujlwm.
Tsis muaj qhov no yog cov ntaub ntawv kab txawv - txhua qhov chaw tsim khoom lag luam raug cai granite yuav tsum tuaj yeem tsim nws yam tsis muaj hesitation. Cov neeg muag khoom uas ua tsis tau, lossis leej twg tau tsis meej pem thaum nug, feem ntau yog cov uas tsim nyog tau ceev faj txog.
Cov kab hauv qab
Tsis muaj cov khoom siv "zoo tshaj" thoob ntiaj teb - cam khwb cia hlau, granite, thiab txawm tias cov kev xaiv tshiab dua xws li ntxhia casting thiab UHPC txhua tus muaj qhov chaw raug cai nyob ntawm qhov load, thermal ib puag ncig, thiab kev kam rau siab. Dab tsi tsis muaj chaw rau yog kho marble li kev hloov pauv hloov tau rau precision granite. Ob cov ntaub ntawv zoo sib xws rau hauv chav ua yeeb yam hauv pem teb thiab coj txawv txawv thaum lawv nqa lub ntsuas ntsuas.