CNC Tolerance Tsim: GD&T, ISO 2768 & Kev Ua Haujlwm Zoo

Tshaj -kev qhia txog qhov kam rau ua yog qhov tseem ceeb ntawm kev tsim cov peev txheej ntawm CNC tshuab. Hloov los ntawm tus qauv machining kam rau ua ntawm ± 0.1 hli raws li ISO 2768-m kom nruj kam rau ua ntawm ± 0.005 hli nce nqi ntau lawm los ntawm 250% mus rau 400% los ntawm cov cuab yeej tshwj xeeb, kev sib tsoo theem nrab, thermal soaking cycles, thiab yuav tsum tau Coordinate Measuring Machine (CMM) tshuaj xyuas. Kev thovGD & T rau CNC machiningnrog Cov Khoom Siv Ntau Tshaj Plaws (MMC) es tsis txhob tawm cov kab ntxiv rau - qhov ntev me me nthuav dav siv tau qhov rais los ntawm 57% yam tsis muaj kev cuam tshuam cov khoom siv sib dhos.

Vim li cas dhau -Kev Ua Siab ntev nce CNC Machining Budgets?

Txhua micrometer tau teev nyob rau hauv engineering print yog raug nplua nyiaj ncaj qha. Nyob rau hauv ib puag ncig ntau lawm, tus tsim engineers feem ntau muab kev zam nruj rau txhua qhov kev kos duab tawm ntawm kev lav phib xaub los yog tsis paub meej txog kev sib dhos kinematics. Qhov kev xyaum no hloov qhov kev pheej hmoo ncaj qha mus rau cov peev nyiaj tsim khoom.

Qhov Tsis yog -Linear Machining Tus nqi sib npaug

Ua kom tiav qhov tseeb qhov tseeb ua raws li tus nqi exponential nkhaus. Txav los ntawm cov txheej txheem roughing hla mus rau siab- precision milling yuav tsum tau qeeb qeeb qeeb, qhov tob tob ntawm kev txiav, tshwj xeeb micro-grain carbide tooling, kev nyab xeeb- tswj machining ib puag ncig khaws cia ntawm 20 degrees Celsius, thiab nquag nyob rau hauv - txheej txheem soj ntsuam. Thaum muab cov khoom siab -precision Cheebtsam los ntawm pebprecision CNC machining cov kev pab cuam. To taub covCov qauv txheej txheem uas cuam tshuam rau txhuas CNC machining nqiNws yog ib qho tseem ceeb ua ntej siv cov kev ua siab ntev nruj thoob plaws uas tsis yog -qhov tseem ceeb clearance geometry.

Thaum ib txoj kab ncaj nraim txav los ntawm kev lag luam nce mus txog tsib micrometers, tus qauv 3-axis CNC ntsug machining chaw tsis tuaj yeem tuav cov txheej txheem txhim khu kev qha. Ib feem yuav tsum raug xa mus los ntawm kev ua haujlwm thib ob, xws li kev sib tsoo cylindrical, jig tho txawv, lossis high-precision Hlau Hluav taws xob tso tawm Machining.

tswjnruj kam rau ua CNC machining nqi, pibzam tsimtheem yuav tsum paub qhov txawv ntawm kev sib raug zoo mating interfaces thiab tsis yog - tseem ceeb clearing geometries.

Kev Muaj Peev Xwm Muaj Peev Xwm: 35% Tus Nqi Tshaj Tawm Tsis yog-Cov Lus Qhia Ua Haujlwm

Ntawm Dazao Machinery, cov neeg siv khoom siv kho qhov muag tau xa cov duab kos uas muaj 16 qhov kev tshem tawm los ntawm - qhov rau M4 lub qhov taub hau taub hau screws. Daim duab lub npe thaiv siv daim pam kam rau ua ntawm ± 0.010 hli hla txhua yam tsis muaj kev ua haujlwm GD&T callouts.

Vim hais tias tus qauv twist drilling drifts nyob ntawm cov cuab yeej nkag dynamics thiab cov khoom grain qauv hauv tus qauvindustrial aluminium CNC machining txheej txheem, ua tau raws li qhov kev qhia tshwj xeeb no tau yuam lub khw hauv pem teb kom pom -drill, ntxhib -drill undersized, kawg- zeb rau qhov chaw, thiab ua tiav nrog kev cai reamers.

Thaum lub sij hawm thawj batch ntawm 200 units, cov cuab yeej hnav ntawm lub reamer ua rau 70 qhov chaw poob tawm ntawm lub nruj specification band, uas ua rau ib tug 35% seem seem. Tom qab kev tshuaj xyuas engineering, Dazao paub tseeb tias lub qhov tsuas yog tshem tawm cov yam ntxwv. Kev tshuaj xyuas qhov tseem ceebprecision CNC qhov ua thiab drilling tsistso cai rau cov neeg siv khoom hloov kho cov duab kos rau ISO tus qauv tshem tawm qhov ntawm 4.5 hli nrog tus qauv kaum ntawm ib millimeter kam rau ua. Qhov kev hloov pauv no tshem tawm qhov kev hla dhau, txo lub sijhawm voj voog los ntawm 4 feeb ib feem, thiab txo qis tus nqi mus rau 0%.

TS EN ISO 2768 Cov Qauv thiab Lub Npe Block General Tolerances: Tshem Tawm Teeb Duab Tsis Zoo

Ib tug qauvmachining kam rau ua engineering kos duabtso siab rau lub npe thaiv qhov dav dav rau kev tswj tsis tau sau npe geometric thiab linear qhov ntev. Kev qhia txog tus txheej txheem thoob ntiaj teb lees paub tiv thaiv kev teeb duab clutter thiab txhais cov theem pib zoo uas xav tau los ntawm cov chaw tsim khoom.

ISO 2768-1 thiab ISO 2768-2 Kev Ua Haujlwm

ISO 2768 tau muab faib ua ob ntu:

TS EN ISO 2768-1:Npog cov kab thiab qhov ntev, categorized rau hauv cov chav kawm kam rau ua: Fine (f), Nruab Nrab (m), Coarse (c), thiab ntxhib heev (v).

TS EN ISO 2768-2:Npog geometrical kam rau ua nrog rau flatness, ncaj, cylindricity, thiab symmetry, tawg mus rau hauv chav kawm H, K, thiab L.

Rau precision CNC milling thiab tig ntawm Dazao, specificationingISO 2768 CNC kam rau uachav kawm mK sawv cev rau kev muaj peev xwm ntawm kev lag luam ntawm cov chaw ua haujlwm niaj hnub. Kev ntsuas qhov Muaj peev xwm sib txawv ntawm 3-axis thiab 5-axis CNC teeb tsalees paub tias kev teeb tsa dav dav rau cov chav kawm f hla cov thav ntawv loj ua rau lub voj voog tsis tsim nyog qeeb qeeb, thermal stabilization pauses, thiab nquag kho cov cuab yeej offset. Cov neeg tsim qauv tuaj yeem ntsuas cov ciam teb no tiv thaivstandard aluminium machining kam rau ua bands.

CNC Tolerance Chart (ISO 2768-1 Linear Dimensions)

Qhov noCNC tolerance daim ntawvtxhais cov kev xav tau sib txawv raws li qhov loj me, kom ntseeg tau tias qhov loj ntawm lub cev tau txais kev faib khoom tsim khoom.

Lub Npe Block Ambiguity Trap thiab Quoting Defense Buffers

Ib qho teeb meem tshwm sim thaum lub sij hawm kev tshuaj ntsuam xyuas yog kos qhov tsis pom tseeb tshwm sim los ntawm cov ntawv tsis sib haum xeeb. Ib daim duab kos npe yuav hais txog General Tolerance: ISO 2768-mK, thaum daim ntawv qhia hauv daim duab qhia tias tshwj tsis yog tau teev tseg, txhua qhov ntev yuav tsum tuav rau ± 0.05 hli.

Ntawm 250 mm ntev tag nrho cov yam ntxwv, ISO 2768-m tso cai rau qhov sib txawv ntawm ib nrab millimeter, uas yooj yim ua tiav los ntawm ib qho kev kub ceev dhau. Txawm li cas los xij, kev txwv tsis pub kos duab yuam kev tso cai sib txawv mus rau nees nkaum ntawm ib millimeter, xav tau ntau qhov kev ua tiav, thermal normalization, thiab tag nrho CMM pov thawj.

Thaum qhov kev tsis sib haum xeeb no tshwm sim, cov kws tsim khoom tsim khoom yuav tsum tau hais raws li qhov yuav tsum tau nruj dua kom tsis txhob muaj kev lees paub los ntawm kev tswj xyuas zoo. Raws li qhov tshwm sim, lub sij hawm voj voog raug suav nrog siv cov cuab yeej ua kom tiav, thiab cov kwv yees ntxiv 30% mus rau 45% pheej hmoo tsis ua rau tus nqi tsev. Thov kom meejengineering cov txheej txheem rau txhuas CNC ib feem tsimthiab txhaisgeneral kam rau ua title block machiningtxoj cai tshem tawm cov nqi buffers no.

Tswv yim GD&T rau CNC Machining: Expanding Manufacturing Windows with True Position

Coordinate dimensioning nrog ntxiv rau -minus tolerances tsim square lossis rectangular tolerance zones. Cov txheej txheem ib txwm siv no ua rau lub tshuab kinematics tsis raug thiab txwv tsis pub muaj kev sib txawv ntawm cov yam ntxwv mating. Kev siv geometric dimensioning thiab kam rau ua muab ib txoj hauv kev ua haujlwm ntau dua.

Coordinate Tolerancing vs. Txoj Haujlwm Tseeb

Thaum lub qhov qhov chaw raug txhais los ntawm kev siv ntxiv rau -minus coordinate dimensions, qhov kev tso cai sib txawv ua rau ib thaj tsam square. Qhov loj tshaj plaws tso cai hloov chaw yog tshwm sim ntawm cov kab pheeb ces kaum kawg ntawm lub square.

Yog hais tias qhov mating ib feem ua haujlwm zoo ntawm qhov kev hloov ntawm kaum sab xis, ib qho cylindrical kam rau ua ib cheeb tsam tuaj yeem txhais tau tias siv kab pheeb ces kaum qhov deb raws li txoj kab uas hla. Hloov cov square ciam teb nrog thaj tsam cylindrical nce qhov chaw tsim khoom tsim los ntawm 57 feem pua.

Kev qhiaqhov tseeb txoj hauj lwm kam rau ua CNC machined qhov chawnrog ib ncig ciam teb muab lub tshuab tus neeg teb xov tooj tseem ceeb ntxiv txheej txheem margin yam tsis hloov lub haum haum ntawm mating fasteners los yog dowels. Qhov no yog tshwj xeeb tshaj yog muaj nqis thaum aligning clearance qhov nrogtxheem xov tsim cov cai rau machined enclosures.

Maximum Material Condition (MMC) thiab Bonus Tolerance

Thaum ib txoj hauj lwm kam rau ua nrog rau qhov Maximum Material Condition modifier, qhov kev tso cai tso cai tso cai tsuas yog siv thaum lub feature ntawm qhov loj yog nyob rau hauv nws cov khoom siab tshaj plaws ciam teb, uas sib haum mus rau qhov tsawg tshaj plaws permissible qhov taub los yog loj tshaj permissible ncej txoj kab uas hla.

Bonus kam rau ua tau txais raws li qhov tseeb tsim lub qhov taub yuav loj dua qhov tsawg kawg nkaus specification txwv. Qhov kev tso cai ntxiv qhov kev hloov pauv no tiv thaiv cov khoom siv suab nrov los ntawm kev khawb vim kev xyaum me ntsis, vim tias qhov loj ntawm qhov ntim tau yooj yim haum rau tus pin mating.

Datum Reference Ncej Alignment nrog CNC Fixturing

Ib qho kev ua tsis zoo tsis tu ncua hauv kev kos duab tsim yog tsim cov hloov pauv tau, tsis yog- tshuab, lossis tsis siv tau raws li cov ntaub ntawv tseem ceeb. CNC fixtures nrhiav cov khoom siv 3-2-1 nrhiav txoj hauv kev:

1. Cov ntaub ntawv tseem ceeb A:Yuav tsum muaj qhov ruaj khov, tag nrho cov txheej txheem txheej txheem tsim 3 lub ntsiab lus sib cuag, txwv lub suab, yob, thiab ntsug txhais lus.

2. Secondary Datum B:Ib tug perpendicular machined ntug los yog precision bore tsim 2 kev sib cuag cov ntsiab lus, constraining yaw thiab kab rov tav txhais.

3. Tertiary Datum C:Lub ntsej muag kawg ntawm lub ntsej muag lossis nres tus pin tsim 1 qhov chaw tiv tauj, txwv qhov seem ntawm txoj kev ywj pheej ntawm kev ywj pheej.

Muab Datum A rau hauv qhov tob tob hauv pem teb machined thaum lub sijhawm teeb tsa theem nrab thaum siv cov khoom siv raw khoom los ntawm kev teeb tsa thawj zaug li Datums B thiab C rog sib cais. Qhov no qhia txog kev teeb tsa kev hloov chaw yuam kev uas siv cov peev nyiaj kam rau siab. Kev sab lajsib sib zog nqus hnab tshos milling txwv thiab cov cuab yeej ncav cuag kev txwvxyuas kom cov datums dlhos nrog lub cev machining teeb.

Engineering Ncej thiab Bore Fits: Xovxwm Fit suav thiab cov cuab yeej Deflection txwv

Kev qhia tshwj xeeb cylindrical fits yuav tsum sib piv cov ciam teb ntawm mating shafts thiab qhov rau lawv cov neeg kho tshuab loads, kev khiav hauj lwm ceev, thiab ib puag ncig kub.

ISO 286 Fit System hauv Precision Machining

Lub ISO haum system ua ke cov qib siab kam rau ua nrog rau qhov txawv txav:

· Clearance Fits (xws li H7/g6 los yog H7/h6):Guarantee zoo clearance rau dawb tig los yog zawv zawg zog.

· Hloov Hloov Fits (xws li H7/k6 lossis H7/n6):Muab qhov chaw raug qhov chaw uas cov khoom xav tau lub teeb lub zog rau kev sib dhos.

· Interference Fits (xws li H7/p6 lossis H7/s6):Muab kev tuav ruaj ruaj thiab torque kis tau tus mob yam tsis muaj cov yuam sij lossis teeb tsa screws.

Kev Tsim Kho Kev Ruaj Ntseg Xovxwm Fit Tolerance Shaft Bore

Thaum engineering anias haum kam rau ua ncej bore,Cov neeg tsim qauv yuav tsum suav rau kev txiav cov cuab yeej deflection thaum lub sijhawm ua haujlwm tho txawv. Cov cuab yeej deflection nce exponentially nrog tho txawv bar overhang thiab txo qis raws li qhov bar txoj kab uas hla nce.

Raws li qhov tob - rau - txoj kab uas hla ntawm ib qho bore sab hauv tshaj plaub mus rau ib qho, txiav quab yuam thawb lub boring bar deb ntawm qhov chaw txiav. Qhov no tsim ib lub ntuj taper qhov twg lub qhov ncauj ntawm lub bore ua tau raws li lub hom phiaj txoj kab uas hla, thaum lub hauv qab ntawm lub bore tseem undersized.

Txhawm rau tiv thaiv kev khi thaum sib dhos:

1. Tsim kev pab cuam undercuts:Siv cov grooves sab hauv hauv qab ntawm qhov muag tsis pom kev bores, siv tus qauvInternal groove thiab undercut machining txoj kevtshem tawm cov cuab yeej nyob ntawm lub hauv paus.

2. Qhia cov hmoov lead-hauv chamfers:Tsim cov khoom siv lead ua- nyob rau hauv lub kaum sab xis ntawm 15 txog 20 degrees nrog qhov tob ntawm axial yam tsawg kawg ib millimeter los tiv thaiv galling thaum lub tshuab xovxwm- haum.

3. Tswj qhov tob- mus rau - txoj kab uas hla:Txwv nruj- kam rau ua cov kabmob bores mus rau qhov tob- rau- txoj kab uas hla qis dua peb mus rau ib qho kom ua kom nruj ib leeg - cov cuab yeej tho txawv los ua haujlwm yam tsis muaj kev sib tham.

Material Physics thiab Surface Finishing: Tswj kev ntxhov siab thiab plating loj hlob

Ua kom tau raws li qhov tseeb qhov tseeb yuav tsum tau ntsuas lub cev metallurgy ntawm lub workpiece thiab cov tshuaj lom neeg qhov ntev ntxiv thaum kho qhov chaw.

Nyias Phab Ntsa thiab Residual Stress Warpage

Nyias-walled aluminium vaj tse nyob rau hauv ib millimeter thiab nyias cross-section rings deform nyob rau hauv clamping quab yuam thiab txiav loads. Nyob rau hauv cov qauv alloys, sab hauv residual stresses los ntawm raw cov ntaub ntawv tso tawm thaum lub sij hawm bulk tshem tawm, ua rau asymmetric warpage.

Kev tuav ruaj khov ntawm qhov ntev ntawm nyias geometry yuav tsum tau saib xyuasQhov tseem ceeb ntawm phab ntsa thickness thresholds nyob rau hauv precision milling. Cov txheej txheem txheej txheem muaj xws li roughing feem ntau ntawm cov khoom Tshuag, unfastening ib feem kom tso cai rau sab hauv kev ntxhov siab so, thiab re-clamping nyob rau hauv lub teeb torque rau zaum kawg tiav.

Ncej -Kev Kho Mob Dimensional Drift: Anodizing Loj hlob

Feem ntau cov hauv paus ntsiab lus ntawm kev kos duab tsis yog -raws li hauvCNC tolerance tsimyog ua tsis tau tejyam account rau nto finish build-up. Anodizing converts puag aluminium rau hauv ib txheej aluminium oxide uas kwv yees li ib nrab ntawm cov txheej nkag mus rau hauv cov substrate thiab ib nrab tsim tawm sab nraud ntawm qhov qub. Thaum ua raws li nrujprecision anodizing thiab nto plating qauv, qhov loj me me yuav tsum raug xam ncaj qha rau hauv pre-machined toolpaths.

Rau cov qauv sulfuric anodizing, sab nrauv kev loj hlob txo qis hauv cov kab uas hla ntawm kwv yees li ib mus rau ob puas ntawm ib millimeter. Rau hardcoat anodizing, sab nrauv kev loj hlob yuav txo tau cov bore diameters txog li tsib puas ntawm ib millimeter.

Yog hais tias lub puab bearing bore yuav tsum tau ib tug precision haum tom qab hardcoat anodizing, machining lub bore rau nominal loj ua ntej plating tshwm sim nyob rau hauv ib tug undersized, tsis kam lees ib feem. Kev kos duab kos duab yuav tsum qhia meej meej seb qhov ntev npaum li cas ua ntej txheej txheej lossis tom qab txheej txheej kom CNC machinists tuaj yeem ua ntej - tho qhov loj.

Multi-Part Tolerance Stack-Up Analysis: Qhov phem tshaj -Case vs. Statistical RSS Models

Thaum ntau qhov precision CNC Cheebtsam sib sau ua ke rau hauv ib qho sub-system, ib feem ntawm qhov sib txawv sib sau ua ke. Kev xam qhov kev hloov pauv no thaum tsim qauv tiv thaiv kev cuam tshuam los ntawm kev sib dhos.

Qhov phem tshaj -Case vs. Root Sum Square (RSS) Analysis

Qhov phem tshaj plaws - cov ntaub ntawv kam rau ua pawg tsom xam xav tias txhua yam khoom tsim nyob rau hauv cov khoom sib dhos yog tsim los ntawm nws qhov kev txwv tsis pub dhau lub cev ib txhij. Tag nrho qhov phem tshaj - qhov sib txawv ntawm qhov sib npaug sib npaug ntawm cov kab ncaj nraim ntxiv ntawm txhua tus neeg kam rau ua.

Statistical Root Sum Square tsom xam xav tias cov khoom sib txawv ntawm kev tsim khoom ua raws li Gaussian kev faib tawm ib txwm nyob nruab nrab ntawm qhov loj me. Tag nrho cov statistical pawg variation yog txiav txim los ntawm combining lub squared variations ntawm tus kheej Cheebtsam.

Nyob rau hauv tsib-ib qho kev sib dhos tshuab qhov twg txhua qhov khoom muaj qhov ua rau tus kheej ntawm ± 0.040 mm, qhov phem tshaj - cov ntaub ntawv sib txawv sib txawv mus txog ± 0.200 mm. Hauv qhov sib piv, qhov sib txawv ntawm qhov sib txawv tseem nyob li ntawm ± 0.090 hli. Tus qauv txheeb cais qhia tau hais tias qhov tseeb sib dhos sib txawv yog tsawg dua ib nrab ntawm qhov kev xav phem tshaj plaws - rooj plaub siab tshaj.

Siv qhov phem tshaj -kev tshuaj ntsuam xyuas rau qis- ntim ntau lawm hauv qab 50 units, luv luv kinematic txuas nrog peb lossis tsawg dua, thiab kev nyab xeeb- kev kho mob tseem ceeb lossis aerospace systems. Siv cov ntaub ntawv txheeb cais rau siab - ntim cov khoom lag luam uas cov txheej txheem muaj peev xwm raug txheeb xyuas los ntawm kev tswj cov txheej txheem txheeb cais. Chaw nyobkam rau ua pawg-nce hauv CNC machiningthaum ntxov hauv CAD theem tiv thaiv ob qho tib si sib dhos ua haujlwm thiab pob nyiaj siv.

Dazao Case Study: daws qhov teeb meem Optical Housing Stack yuam kev

Lub siab - daws teeb meem LiDAR sensor enclosure tsim nyob rau hauv Dazao muaj tsib stacked CNC txhuas tuav rings, spacers, thiab lens rooj. Txhua tus neeg tivthaiv dhau los ntawm kev tswj xyuas zoo tiv thaiv nws tus kheej cov kab kos qhov siab ntev ntawm ± 0.035 hli.

Txawm li cas los xij, thaum lub rooj sib txoos zaum kawg ntawm cov neeg siv khoom, lub hom phiaj lens ua tsis tiav vim yog pawg axial - nce qhov yuam kev ntawm ze li ob - feem kaum ntawm ib millimeter.

Nyob rau hauv thawj lub rooj sib txoos tsim, tsib yam khoom sib cais tau muab tso ua ke, suav nrog lub hauv paus flange, ob lub shims, lub rooj zaum lens, thiab lub nplhaib xauv. Qhov sib txawv axial sib txawv thoob plaws tsib qhov sib cuam tshuam tsim kev cuam tshuam ncaj qha nrog lub focal adjustment mechanism.

Dazao tus nqi- engineering daws qhov teeb meem los ntawm redesigning sub- sib dhos rau hauv ib qho monolithic tsib-axis milled vaj tsev uas ua ke lub hauv paus flange, thawj shim, thiab lub rooj zaum lens. Machining cov yam ntxwv no los ntawm ib qho kev siv datum hauv ib qho teeb tsa txo qhov kev hloov pauv axial tiav rau ± 0.020 hli thaum txiav tag nrho cov nqi tsim khoom los ntawm 22%.

Metrology Disconnects: daws CMM Inspection Reports vs. Physical Assembly Binding

Ib feem uas ntsuas nyob rau hauv kev kos duab kam rau ntawm daim ntawv tshuaj ntsuam CMM tseem tuaj yeem khi lossis ua tsis tiav thaum lub sijhawm sib dhos ntawm lub cev vim yog cov ntsiab lus - piv txwv thiab cov ntawv yuam kev.

CMM Probe Point Sampling vs. Functional Form Errors

Cov txheej txheem tsis sib xws- taw tes CMM niaj hnub feem ntau ntsuas qhov bore sab hauv los ntawm kev kaw plaub mus rau yim lub ntsiab lus kov. Lub software tom qab ntawd siv qhov nruab nrab algorithm los tsim lub voj voog theoretical.

Yog peb- lub puab tsaig chuck clamping quab yuam deform ib tug nyias- lub tes tsho phab ntsa thaum tig, lub tiav lawm bore yuav pom ib tug peb -lobed daim ntawv defect. Kev tshuaj ntsuam xyuas CMM tus qauv tuaj yeem kov cov cheeb tsam nruab nrab thiab suav cov kab uas siv tau rau 20 hli nominal qhov. Txawm li cas los xij, thaum lub cylindrical ntsuas tus pin raug tso, lub lobed cuam tshuam peaks tiv thaiv kev nkag.

Txhawm rau tshem tawm qhov kev tshuaj ntsuam no disconnect:

· Qhia kom meej kev soj ntsuam tas li CMM niaj hnub nrog cov ntsiab lus siab siab tshaj 500 cov ntsiab lus ib kiv puag ncig, lossis ntxiv cov Cylindricity thiab Roundness callouts ntawm precision bores.

· Qhia meej txog kev ntsuas kev ua haujlwm ncaj qha rau hauv cov ntawv sau, hais tias cov yam ntxwv yuav tsum dhau tag nrho -Length Class X Go thiab Tsis yog- Mus ntsaws cov ntsuas ntawm 20 degrees Celsius.

Thermal Expansion hauv Precision Metrology

Machining Rhiav feem ntau ua haujlwm ntawm 24 txog 30 degrees Celsius, thaum ntsuas ntsuas ntsuas ntsuas ntsuas nruj nruj ntawm 20 degrees Celsius.

Thermal contraction tshwm sim thaum lub sov aluminium tivthaiv nkag mus rau hauv ib tug txias metrology kuaj. Rau 300 hli txhuas cov qauv phaj, yim -degree kub poob los ntawm lub khw sov hauv pem teb mus rau qhov chaw ua haujlwm txias txias ua rau ntau tshaj tsib puas ntawm ib millimeter ntawm qhov me me.

Yog tias qhov kev tiv thaiv nruj ntawm ± 0.025 hli raug tshawb xyuas tam sim ntawd ntawm lub tshuab cuab yeej lub txaj tsis muaj lub voj voog sov so, qhov yuav ntsuas tawm ntawm qhov tshwj xeeb thaum kuaj zaum kawg. Dazao cov txheej txheem zoo cia siab rau kev nrujkub - tswj kev ntsuas ntsuas thiab CMM tshuaj xyuas kev ua haujlwm, yuav tsum tau muaj 4-teev thermal stabilization lub sij hawm nyob rau hauv lub metrology cleanroom rau tag nrho cov precision Cheebtsam ua ntej kev soj ntsuam zaum kawg qhia.

Dazao DFM Matrix: Actionable Tolerance Allocation and Drawing Review Checklist

Kev sib npaug ntawm kev ua haujlwm nrog kev lag luam ntau lawm yuav tsum tau categorizing txhua qhov duab kos rau hauv cov theem ua haujlwm ua ntej ua tiav cov ntawv luam tawm.

Ua ntej-Tshaj tawm DFM Tolerance Checklist rau Engineers

Ua ntej tso ib daim duab rau kev tsim khoom lossis kev hais tawm, tshuaj xyuas tsib yam hauv qab no:

1. Title Block Cleanness:Puas yog qhov kev zam dav dav tau teeb tsa rau ISO 2768-mK, thiab muaj cov ntawv sau tsis sib haum xeeb raug tshem tawm?

2. GD&T Datum Alignment:Puas yog Datums A, B, thiab C raug xa mus rau kev siv tau, tag nrho lub ntsej muag lub ntsej muag uas phim lub cev 3-2-1 CNC clamping teeb?

3. Txoj Haujlwm Tseeb nrog MMC:Puas muaj kev sib koom ua ke ntawm cov qauv ntawm lub qhov tau hloov mus rau Txoj Haujlwm Tseeb nrog cov khoom siv siab tshaj plaws hu xov tooj?

4. Txheej Kev Loj Hlob:Puas yog daim duab piav qhia seb qhov tseem ceeb ntawm qhov bore thiab ncej qhov ntev siv ua ntej txheej lossis tom qab txheej?

5. Internal Pocket Geometry:Muaj cov kab noj hniav sab hauv kaum radii tau teev nrog siv rautswj lub kaum sab xis radii los tswj cov nqi machiningtxhawm rau tshem tawm cov kaum sib tham thiab tso cai rau cov txheej txheem kev hla dhau?