Nto tiav hauv CNC sib tsoo ua haujlwm
1. Hom Nto Roughness Achievable
CNC sib tsoo ua tiav zoo tshaj saum npoo tiav piv rau cov txheej txheem txiav ib txwm vim nws ntau -point abrasive txiav mechanism thiab meej tswj ntawm geometric thiab kinematic tsis. Kev sib tsoo ntxhib rau kev tshem tawm cov khoom hnyav feem ntau ua rau qhov roughness ntawm 0.8 thiab 3.2 micrometers Ra, haum rau qhov ua ntej sizing thiab cov duab kho qhov chaw ua tiav tom ntej yuav ua raws. Semi-kev sib tsoo tiav nrog qhov nruab nrab tsis zoo thiab cov khoom zoo tshaj plaws yields 0.4 txog 0.8 micrometers Ra, tsim nyog rau cov khoom siv dav dav thiab tsis yog- cov kabmob tseem ceeb. Precision sib tsoo siv optimized log specifications, hnav khaub ncaws raws tu qauv, thiab kinematic tej yam kev mob mus txog 0.1 mus rau 0.4 micrometers Ra, txaus rau hydraulic spools, precision shafts, thiab tshuab cuab tam txoj kev. Kev sib tsoo zoo nrog cov thev naus laus zis thev naus laus zis thiab kev teeb tsa nruj ua tiav 0.05 txog 0.1 micrometers Ra, haum rau siab -kev ua tau zoo bearings, roj txhaj tshuaj, thiab aerospace qhov chaw tseem ceeb. Ultra- precision sib tsoo siv lub log tshwj xeeb, hauv - txheej txheem hnav khaub ncaws, thiab kev vibration- ib puag ncig sib cais ua rau daim iav-zoo li qhov chaw qis dua 0.025 micrometers Ra, nrog rau kev siv tshwj xeeb hauv cov pwm kho qhov muag, cov khoom siv semiconductor, thiab cov qauv ntsuas ntsuas 1 micrometer mus txog 0.0.
2. Txheej Txheem Sib Tsoo Mechanism thiab Deg Generation
Kev sib tsoo hauv paus sib txawv ntawm ib qho - taw tes txiav hauv nws cov txheej txheem tshem tawm cov khoom. Tsis yog ib qho kev txiav ntug txiav cov khoom siv, kev sib tsoo ua haujlwm ntau txhiab microscopic abrasive nplej uas ua raws li tus neeg txiav cov ntsiab lus. Txhua lub lis piam nkag mus rau qhov chaw ua haujlwm rau qhov tob tob, tsim cov chips me me thiab tawm hauv cov cim kos zoo. Kev sib koom ua ke ntawm suav tsis txheeb nplej sib cuam tshuam ua rau cov yam ntxwv hauv av zoo nkauj. Qhov saum npoo tiav yog nyob ntawm qhov ceev ntawm cov ntsiab lus txiav, qhov tob ntawm tus kheej nkag mus, lub log-workpiece txheeb ze zog, thiab cov khoom deformation tus cwj pwm nyob rau hauv siab - lim- tus nqi.
Lub kinematic kev sib raug zoo ntawm lub log nto topography thiab workpiece motion txiav txim theoretical tiav txwv. Lub undeformed nti thickness, uas sawv cev rau qhov tob ntawm cov khoom tshem tawm los ntawm ib tug grain, nyob ntawm seb lub log ceev, workpiece ceev, qhov tob ntawm txiav, thiab lub log txoj kab uas hla. Cov nti me me ua rau qhov zoo nkauj zoo nkauj tab sis yuav tsum tau txo cov khoom tshem tawm. Qhov kev lag luam muaj txiaj ntsig no- tawm ntawm kev tsim khoom lag luam thiab kev ua tiav txhais cov kev sib tw kev lag luam zoo hauv kev sib tsoo.
3. Log Specification thiab Conditioning Effects
Abrasive hom xaiv tsim lub hauv paus rau kev ua tiav tiav. Aluminium oxide abrasives haum rau dav dav - lub hom phiaj ferrous cov khoom sib tsoo nrog kev sib npaug zoo ntawm kev txiav muaj peev xwm thiab lub neej log. Silicon carbide abrasives ua tau zoo rau cov khoom tsis yog{3}}ferrous, cam khwb cia hlau, thiab ceramics vim lawv cov ntse thiab brittleness. Cubic boron nitride abrasives ua rau siab - nrawm nrawm sib tsoo ntawm cov hlau tawv tawv thiab superalloys nrog cov ntawv zoo dua khaws cia thiab thermal stability. Pob zeb diamond abrasives muab qhov kawg hardness rau kev sib tsoo carbides, ceramics, thiab tsis yog -ferrous cov ntaub ntawv, ua kom tiav zoo tshaj plaws nyob rau hauv ultra- daim ntaub ntawv precision.
Grain loj profoundly cuam tshuam nto zoo nkauj. Coarse grains ntawm 24 mus rau 60 mesh tshem tawm cov khoom sai tab sis tawm hauv qhov sib sib zog nqus khawb thiab ntxhib qhov chaw. Cov nplej nruab nrab ntawm 80 mus rau 180 mesh tshuav nyiaj li cas thiab ua tiav rau kev ua haujlwm dav dav. Cov nplej zoo ntawm 220 mus rau 400 mesh tsim cov npoo du rau cov khoom siv. Cov nplej zoo heev saum 600 mesh thiab micrograins ua kom daim iav tiav hauv cov ntawv tshwj xeeb. Cov qoob loo loj yuav tsum tau xaiv raws li qhov xav tau ua tiav thiab cov khoom tshem tawm, nrog cov nplej nplua nuj tshwj xeeb rau kev ua tiav dhau los tom qab qhov hnyav.
Lub log qib lossis hardness txiav txim siab npaum li cas cov nplej khov kho tau tuav hauv daim ntawv cog lus. Cov qib nyuaj khaws cov nplej ntev dua, tswj lub log geometry tab sis muaj peev xwm ua rau glazing thiab hlawv thaum cov nplej ua npub. Cov qib mos tso tawm cov khoom hnav yooj yim, nthuav tawm cov ntsiab lus tshiab thiab txo cov thermal puas tab sis hnav sai dua thiab yuav tsum tau hnav khaub ncaws ntau dua. Rau kev sib tsoo zoo, cov qib mos mos uas txhawb nqa tus kheej -ntxhiab tsis hnav ntau dhau feem ntau ua pov thawj pom zoo.
Bond hom cuam tshuam tus cwj pwm ntawm lub log thiab kev ua tiav tiav. Vitrified bonds muab rigidity, porosity rau coolant nkag, thiab zoo heev daim ntawv tuav rau precision sib tsoo. Resin bonds muab elasticity thiab poob siab tsis kam, haum rau kev ua tiav zoo thiab nyias - daim ntawv thov log. Cov ntawv cog lus hlau muab qhov siab tshaj plaws khaws cia rau cov log superabrasive hauv siab - nrawm thiab nkag- pub kev sib tsoo. Electroplated bonds concentrate superabrasives hauv ib txheej rau kev tshem tawm cov khoom hnyav thiab cov ntawv sib tsoo.
Log hnav khaub ncaws thiab txias sawv cev rau cov txheej txheem tseem ceeb uas ncaj qha tsim qhov kev txiav saum toj kawg nkaus. Tib - taw tes pob zeb diamond hnav khaub ncaws hla lub ntsej muag lub log kom tsim cov macro meej-geometry thiab nthuav tawm cov nplej tshiab. Rotary pob zeb diamond dressers ua tiav kev hnav khaub ncaws ntau dua thiab ua kom zoo sib xws ntawm cov nplej. Crush hnav khaub ncaws ua rau lub log siv cov yob hardened rau siab - ntau lawm daim ntawv thov. Rau kev sib tsoo ultra-precision sib tsoo, electrolytic hauv- txheej txheem kev hnav khaub ncaws tuav lub log sharpness tsis tu ncua thaum lub sij hawm machining, tiv thaiv glazing thiab ua kom zoo ib yam ua tiav thoob plaws kev tsim khoom.
4. Sib tsoo Parameter Optimization
Lub log ceev muaj feem cuam tshuam rau qhov chaw tiav thiab kev ua haujlwm zoo. Kev nrawm dua tuaj yeem ua rau tus lej ntawm cov ntsiab lus txiav tawm hauv ib lub sijhawm thiab txo qis cov nti tuab, txhim kho qhov zoo nkauj. Kev sib tsoo ua haujlwm ntawm 25 mus rau 35 meters ib ob. High- sib tsoo ceev nce mus rau 45 mus rau 80 meters ib ob, nrog creep- pub thiab tshwj xeeb daim ntawv thov mus txog 100 mus rau 200 meters ib ob. Kev nrawm nrawm ua kom muaj cua sov ntau dhau thiab yuav tsum tau xa cov khoom cua txias kom tiv thaiv kev puas tsuaj thermal.
Workpiece ceev los yog pub tus nqi cuam tshuam rau qhov sib tshooj ntawm kev sib hloov ntawm lub log txuas ntxiv. Tsawg workpiece speeds nce tus naj npawb ntawm cov nplej sib koom ua ke ntawm ib chav tsev ntev, txhim kho kev ua tiav tab sis ncua sij hawm mus txog. Hom workpiece ceev ntawm 0.5 mus rau 30 meters ib feeb nyob ntawm seb hom txheej txheem sib tsoo. Hauv kev sib tsoo cylindrical, lub workpiece rotational ceev txheeb ze rau lub log ceev txiav txim siab tus qauv nto.
Qhov tob ntawm kev txiav los yog kev pub noj tus nqi tswj cov khoom siv tshem tawm. Rough sib tsoo siv qhov tob ntawm 0.01 mus rau 0.05 millimeter kom tshem tawm cov khoom lag luam sai. Kev sib tsoo kom tiav txo qhov tob rau 0.001 txog 0.01 millimeter kom txo qis zog thiab txhim kho qhov zoo nkauj. Kev ua tiav tiav tuaj yeem siv qhov tob hauv qab 0.001 millimeter nrog lub txim taws - tawm lub sijhawm kom ua tiav qhov kawg. Qhov tob tob ua rau muaj zog sib tsoo, ua rau lub log deflection, workpiece distortion, thiab thermal puas uas degrades tiav thiab qhov tseeb.
Spark-tawm los yog nyob hauv kev sib tsoo muaj kev sib hloov ntawm lub log txuas ntxiv yam tsis muaj kev nkag mus ntxiv tom qab ncav cuag qhov kawg. Qhov kev ua kom kub hnyiab no ua rau deforms nto asperities thiab txo qhov seem roughness los ntawm 20 mus rau 50 feem pua. Lub sijhawm yog nyob ntawm qhov kev nruj nruj thiab qhov pib ntawm qhov chaw, feem ntau yog li ntawm ob peb feeb mus rau feeb rau cov ntawv thov raug.
5. Coolant thiab Fluid Delivery
Sib tsoo coolant pab ntau yam tseem ceeb tshaj li qhov yooj yim tswj qhov kub thiab txias. Nws tshem tawm kev sib tsoo cua sov los ntawm thaj chaw tiv tauj, tiv thaiv thermal expansion, metallurgical theem hloov, thiab residual tensile stresses. Nws tshem tawm swarf thiab tawg nplej nplej kom tiv thaiv lub log loading thiab nto khawb. Nws lubricates lub log -workpiece interface, txo kev sib txhuam thiab txhim kho qhov chaw ncaj ncees.
Kev xaiv hom coolant sib npaug lubricity, txias peev xwm, thiab tshuaj stability. Roj-raws li cov coolants muab lubrication zoo dua rau kev ua tiav zoo thiab nyuaj- rau- cov khoom sib tsoo tab sis tam sim no muaj kev pheej hmoo hluav taws kub thiab kev txhawj xeeb ntawm ib puag ncig. Dej-soluble synthetic coolants muab cov cua txias zoo heev thiab yaug rau kev ua haujlwm siab -. Semi-synthetics ua ke nruab nrab lubrication thiab txias rau dav -lub hom phiaj precision sib tsoo.
Kev xa khoom siab thiab kev tsim nozzle tseem ceeb cuam tshuam rau kev ua haujlwm txias. Kev xa dej nyab ntawm qhov tsis tshua muaj siab haum rau kev sib tsoo. High- siab nozzles ntawm 10 mus rau 40 bar ncaj qha coolant mus rau hauv kev sib tsoo cheeb tsam rau siab -ceev thiab creep- pub daim ntaub ntawv. Khau nozzles uas ntim lub log periphery maximize coolant nkag mus rau hauv cheeb tsam tiv tauj. Los ntawm - log coolant passages nyob rau hauv cov log tshwj xeeb ua rau kev xa khoom sab hauv rau kev nkag mus rau hauv daim ntawv sib tsoo.
Coolant filtration tswj cov kua dej huv. Cov dej tsis huv nrog cov khoom abrasive thiab cov hlau nplua ua rau nto khawb thiab ua ntej lub log loading. Cov tshuab lim dej xws li cov khoom sib nqus sib nqus mus rau cov ntawv lim ntawv thiab cov tshuab centrifugal yuav tsum ua kom tiav cov kev huv huv uas tsim nyog rau kev ua tiav.
6. Lub tshuab txias thiab Rigidity
Sib tsoo tshuab rigidity fundamentally constrains ua tiav tiav. Lub sib tsoo lub tog raj kheej yuav tsum tswj cov sub-micrometer runout nyob rau hauv kev ua haujlwm. Hydrostatic los yog hydrodynamic bearings muab superior nruj thiab damping piv rau dov caij bearings rau precision daim ntaub ntawv. Log taub hau infeed daws teeb meem thiab rov ua dua yuav tsum ua tiav 0.1 micrometer lossis zoo dua rau kev ua tiav zoo.
Workpiece spindle mob zoo ib yam li cylindrical sib tsoo tiav. Bearing runout, tsav vibration, thiab thermal loj hlob ncaj qha mus rau hauv daim ntawv tsis raug thiab kev ntxhib los mos variation. Cov tshuab Precision siv hydrostatic workhead spindles nrog cov tsav ncaj qha los txo qhov kev vibration.
Tshuab structural dynamics txiav txim siab rau regenerative chatter. Cov txheej txheem sib tsoo ua rau muaj cov txheej txheem siab nruj thiab cov txheej txheem qis qis, ua rau nws raug rau tus kheej -zoo siab vibration ntawm qhov ceev ceev. Lub tshuab tsim yuav tsum muab cov qauv tsim kom txaus, thiab kev ua haujlwm tsis zoo yuav tsum tsis txhob muaj qhov tsis ruaj khov ceev uas tau txheeb xyuas los ntawm kev ua haujlwm zoo.
Thermal stability tau txais kev saib xyuas tshwj xeeb hauv kev sib tsoo precision. Thaum tshav kub kub los ntawm lub log tsav lub cev muaj zog, lub tshuab hydraulic, thiab kev sib tsoo ua rau lub tshuab qauv nthuav dav. Qhov kub thiab txias-tswj ib puag ncig, lub sijhawm tshuab ntxhua khaub ncaws, thiab cov txheej txheem thermal them nyiaj muaj qhov ruaj khov ntawm qhov ntev thaum ua haujlwm ntev.
7. Kev txiav txim siab ntawm cov khoom siv ua haujlwm
Cov khoom siv tseem ceeb cuam tshuam rau kev sib tsoo thiab ua tiav tiav. Hardened steels ntawm 50 thiab 65 HRC zom tau yooj yim nrog txhuas oxide los yog cubic boron nitride log, ua tiav zoo tiav nrog rau qhov tsis zoo. Cov hlau mos hauv qab 45 HRC nyiam thauj cov log thiab tsim cov burr ntau dhau, ua kom tiav kev sib tsoo nyuaj dua. Cov hlau tsis muaj steel, tshwj xeeb tshaj yog qib austenitic, ua haujlwm- tawv thiab nthuav tawm cov thermal conductivity tsis zoo, xav tau lub log ntse thiab ua kom txias txias kom tiv thaiv qhov kub hnyiab thiab ua tiav tiav.
Cam khwb cia hlau zom zoo vim graphite lubrication, nrog grey hlau ua tiav zoo dua li nodular hlau vim flake graphite morphology. Titanium alloys muaj kev sib tsoo loj heev los ntawm cov tshuaj reactivity, tsis tshua muaj thermal conductivity, thiab elastic rov qab, feem ntau txwv cov pa sib tsoo rau 0.4 mus rau 0.8 micrometers Ra. Ceramics thiab carbides xav tau pob zeb diamond abrasive log thiab tshwj xeeb tsis muaj peev xwm ua tiav nyob ntawm cov khoom siv porosity thiab grain qauv.
8. Cov txheej txheem sib tsoo tshwj xeeb rau kev ua tiav tiav
Creep- pub kev sib tsoo siv cov khoom ua haujlwm qeeb heev thiab qhov tob loj ntawm kev txiav hauv ib qho dhau los, feem ntau yog siv rau qhov sib sib zog nqus thiab cov ntawv. Txawm hais tias muaj kev tshem tawm cov khoom siv siab, kev xaiv qhov kev xaiv ua tiav tiav ntawm 0.4 txog 0.8 micrometers Ra vim qhov hnav khaub ncaws tsis tu ncua thiab ruaj khov txiav.
Centerless sib tsoo tshem tawm workpiece centering yuam kev, ua tau zoo roundness thiab zoo finishes rau cylindrical qhov chaw. Los ntawm - pub centerless sib tsoo suits ntev tuav thiab shafts, thaum infeed centerless sib tsoo handles stepped diameters. Kev ua tiav tiav ntawm 0.1 txog 0.4 micrometers Ra nyob ntawm kev teeb tsa precision.
Internal sib tsoo tshuab bores thiab qhov siv me me - txoj kab uas hla log ntawm cov quills ntev, nthuav qhia ntau dua deflection cov nyom dua li sab nraud sib tsoo. Kev ua tiav tiav feem ntau yog li ntawm 0.2 txog 0.8 micrometers Ra, nrog siab - kev teeb tsa qhov tseeb txog 0.1 micrometer.
Kev sib tsoo deg ua rau thaj chaw tiaj tus siv cov khoom siv peripheral lossis lub ntsej muag lub log. Precision nto sib tsoo nrog cov log zoo thiab kev hnav khaub ncaws zoo ua tiav 0.1 txog 0.2 micrometers Ra ntawm cov khoom tiaj tus. Muab ob npaug rau-disk sib tsoo ib txhij tshuab ob lub ntsej muag ntawm qhov chaw tiaj tus, ua tiav kev sib luag thiab ua tiav tsim nyog rau qhov tseeb thrust bearings thiab twj tso kua mis vanes.
Superfinishing thiab microfinishing siv cov pob zeb abrasive sib koom ua ke los yog cov kab xev oscillating ntawm lub siab zaus nrog lub teeb siab kom tshem tawm cov txheej txheej sab nraud ntawm cov chaw hauv av. Cov txheej txheem no txo qhov roughness ntawm 0.2 mus rau 0.4 micrometers Ra mus rau 0.025 mus rau 0.1 micrometers Ra thaum qhia txog compressive residual stresses muaj txiaj ntsig rau lub neej qaug zog.
9. Cov txheej txheem saib xyuas thiab kev tswj kom haum
Niaj hnub nimno CNC sib tsoo integrates sensors rau tiag - lub sij hawm cov txheej txheem saib xyuas. Acoustic emission sensors ntes lub log- ua haujlwm sib cuag, hnav khaub ncaws zoo, thiab sib tham pib. Force sensors ntsuas ib txwm thiab tangential sib tsoo rog, ua rau kev hloov pauv kev tswj hwm uas tswj xyuas cov khoom siv tas li tshem tawm txawm tias lub log hnav lossis qhov sib txawv ntawm qhov nyuaj. Kev saib xyuas lub zog muab qhov qhia tsis ncaj qha rau kev ntsuas kev ruaj ntseg. Nyob rau hauv- txheej txheem ntsuas ntsuas workpiece txoj kab uas hla thaum lub sij hawm cylindrical sib tsoo, ua kom loj-tswj chim- tawm thiab tsis siv neeg them nyiaj rau thermal drift thiab log hnav.
Cov peev xwm saib xyuas no ua rau kaw- lub voj voog tswj uas tswj xyuas qhov ua tiav nyob rau hauv lub neej ntawm lub log thiab them nyiaj rau cov khoom sib txawv. Adaptive systems txo tus neeg teb xov tooj kev vam thiab txhim kho batch sib xws rau precision ntau lawm.
10. Kev daws teeb meem kev ua tiav tag nrho
Log loading manifests li glazed nto tsos thiab ntxhib, torn workpiece kev ntxhib los mos, yuav tsum softer qib xaiv, nruj hnav khaub ncaws ntau, los yog txhim kho coolant xa. Kev sib tsoo kub tshwm sim li discoloration, metallurgical transformation, los yog nto tawg los ntawm kub heev, yuav tsum tau txo qhov tob ntawm txiav, ntxiv coolant txaus, los yog qis log ceev. Chatter tsim cov qauv waviness tsis tu ncua los ntawm kev co regenerative vibration, yuav tsum tau hloov ceev, ntxiv zog zog, los yog log rebalancing. Cov kab pub los yog cov cim traverse qhia tias hnav cov hlau lead tsis zoo lossis tus nqi pub ntau dhau ntawm lub log dav. Tawm- ntawm- roundness nyob rau hauv cylindrical sib tsoo qhia txog kev ua haujlwm ntawm lub taub hau, qhov chaw tsis raug, lossis tsis sib xws hauv kev sib tsoo tsis sib xws.
Xaus
CNC sib tsoo ua tiav nto tiav los ntawm semi-precision ntawm 0.8 micrometers Ra mus rau ultra- qhov tseeb daim iav nto hauv qab 0.025 micrometers Ra, tshaj cov txheej txheem txiav cov txheej txheem nyob rau hauv qhov chaw ncaj ncees thiab qhov tseeb. Lub multi-taw tes abrasive mechanism ua rau kev tswj cov khoom tshem tawm ntawm cov nplais me me, ua rau thaj chaw nrog cov kev ntxhov siab seem seem thiab daim ntawv geometric meej. Ua tiav cov peev txheej no yuav tsum tau ua tib zoo saib xyuas lub log specification thiab txias, parameter optimization, coolant xa, tshuab mob, thiab xyuas cov txheej txheem. Rau cov ntawv thov tseem ceeb hauv kev tsim cov kabmob, precision hydraulics, aerospace Cheebtsam, thiab cov tshuab kho qhov muag, kev sib tsoo tseem yog qhov tseem ceeb ntawm cov txheej txheem tiav uas txhais tau tias qhov zoo tshaj plaws ntawm precision mechanical systems.
