Vim Li Cas Cov Neeg Tsim Tshuab Precision Thiaj Hloov Los Ntawm Cast Iron Mus Rau Granite

Txhua tus neeg uas tau siv sijhawm nyob hauv chav kuaj ntsuas metrology tej zaum yuav tau pom tib yam qauv: cov tshuab qub zaum ntawm cov txaj hlau cam khwb cia, cov tshiab dua zaum ntawm pob zeb dub. Qhov kev hloov pauv ntawd tsis tau tshwm sim vim tias granite zoo nkauj dua nyob rau hauv lub teeb. Nws tau tshwm sim vim yog qhov teeb meem physics tsis zoo nkauj - thermal expansion.

Cov hlau cam khwb cia nthuav dav thiab cog lus ntawm kwv yees li 10-12 x 10⁻⁶ ib °C. Qhov ntawd zoo li me me kom txog thaum koj muab tso rau ntawm granite ntuj, uas feem ntau nyob ib puag ncig 5-8 x 10⁻⁶ ib °C, thiab hauv qee cov granites dub ntom ze rau 4-5 x 10⁻⁶. Ntawm lub platform ntsuas 1-meter, qhov kub thiab txias 1 ° C tuaj yeem hloov qhov chaw hlau cam khwb cia los ntawm ntau microns ntau dua li qhov sib npaug granite. Rau kev kam rau siab hauv pem teb, tsis muaj leej twg mob siab. Rau CMM kuaj xyuas theem semiconductor wafer, lossis laser interferometer tuav sub-micron repeatability, qhov sib txawv ntawd yog tag nrho cov pob.

Kev txo qhov hnyav tseem ceeb npaum li kev nthuav dav

Kev ruaj khov ntawm qhov kub tau txais kev saib xyuas feem ntau, tab sis kev co damping yog qhov tseem ceeb rau txhua yam ua qhov kev txav mus los siab - pick-and-place heads, XY stages, air-bearing platforms. Granite yog cov khoom sib xyaw ua ke crystalline es tsis yog cov hlau sib xws, yog li kev co tshuab tsis kis mus rau nws tib yam li nws ua los ntawm cov hlau cam khwb cia. Cov ciam teb sab hauv tawg thiab nqus lub zog es tsis txhob xa nws huv si. Hauv kev xyaum qhov no txhais tau tias alub hauv paus granitenws nyob sai dua tom qab lub tshuab axis tsis txav mus los, uas txhais tau tias lub sijhawm nyob luv dua thiab muaj cov khoom siv ntau dua ntawm cov kab tshuaj xyuas thiab cov kab sib dhos.

Tseem muaj qhov teeb meem ntawm qhov tshwm sim rau lub sijhawm ntev. Cov txaj hlau cam khwb cia, txawm tias cov uas txo kev ntxhov siab, tuaj yeem nce me ntsis dhau xyoo vim tias kev ntxhov siab sab hauv casting rov faib dua. Granite, twb tau tsim nyob rau hauv lub zog ntuj loj heev dhau lub sijhawm geological, tsis muaj teeb meem ntawd - nws tsis "nyob ruaj khov" raws li txoj kev casting.

Tsis yog txhua lub granite zoo ib yam

Qhov no yog qhov uas ua rau ntau tus neeg yuav khoom xav tsis thoob. Granite raug muag ntawm qhov ceev thiab xim zoo li cov ntoo raug muag ntawm cov hom, tab sis kev ua haujlwm lub cev sib txawv ntau ntawm cov chaw txua zeb. Pob zeb qis dua, lossis cov khoom siv uas pom tseeb thiab cov noob tsis sib xws, yuav tsis tuav tib qhov tiaj tiaj raws sijhawm li cov granite dub ntom, zoo-grained hauv 2,900-3,100 kg / m³ ntau yam. Marble qee zaum hloov los ntawm cov neeg muag khoom me me vim tias nws pheej yig dua thiab yooj yim dua rau kev siv tshuab, tab sis marble yog pob zeb metamorphic carbonate - softer, ntau dua porous, thiab tsis ruaj khov dua li granite tiag tiag. Rau lub countertop kho kom zoo nkauj uas tsis muaj feem cuam tshuam. Rau lub phaj nto uas CMM probe yuav xa mus rau ntau txhiab zaus hauv ib hnub, nws tseem ceeb heev, thiab nws yog ib qho ntawm cov txoj hauv kev uas cov neeg yuav khoom tau luv luv yam tsis paub txog nws kom txog thaum calibration drift tshwm sim ntau lub hlis tom qab.

Qhov twg qhov no tshwm sim hauv kev xyaum

Qhov kev hloov mus rau granite bases yog qhov pom tseeb tshaj plaws hauv cov khoom siv tshuaj xyuas semiconductor, PCB drilling thiab AOI systems, peb-coordinate measuring machines, laser interferometry setups, thiab nce ntxiv hauv roj teeb thiab precision optics manufacturing, qhov twg sub-micron positioning tau dhau los ua qhov yuav tsum tau ua ntej es tsis yog qhov khoom kim heev. Raws li kev kam rau siab thoob plaws cov lag luam no khaws cia nruj - tsav los ntawm cov chip nodes me me, cov roj teeb nyias dua, thiab cov laser systems sai dua - qhov sib txawv ntawm "zoo txaus" cam khwb cia hlau thiab granite ruaj khov tsuas yog yuav tau txais ntau dua, tsis tsawg dua.

Yog tias muaj ib qho lus nug rau cov engineers uas xav txog lub platform tshiab uas muaj kev ua haujlwm zoo, nws yog qhov no: nug txog qhov tseeb ntawm qhov ceev thiab qhov thermal expansion, tsis yog tsuas yog "granite" ua ib qho checkbox material xwb. Qhov txawv ntawm cov granite uas tau xaiv zoo thiab cov khoom siv qis dua tuaj yeem yog qhov txawv ntawm lub tshuab uas tuav calibration rau ib xyoo caum thiab ib qho uas xav tau rov calibration txhua peb lub hlis.