Lub platen loj heev uas tau cycled mus rau 300℃txhua hnub rau ib xyoo caum maj mam hneev nyob rau hauv nruab nrab, rub down down los ntawm nws tus kheej qhov hnyav thiab sau thermal qaug zog. Raws li deformation tsim, cov txheej txheem cov txheej txheem pib qhia cov txheej txheem thickness variation, feem ntau thinner nyob rau hauv nruab nrab thiab inconsistent nyob rau hauv ib cheeb tsam. Hauv cov xwm txheej zoo li no, kev kho dua tshiab tau ua tiav los ntawm kev tswj hwm kev kho kho ntawm kev txhawb nqa geometry, txheej txheem siv los uaqib sagging multizone cua sov platenassemblies rov qab mus rau lawv cov thawj thermal flatness specification.
Nkag siab Ntev -Lub Sij Hawm Platen Sagging
Thermal Cycling thiab Structural Creep
Cov cua kub loj loj ua haujlwm nyob rau hauv kev rov ua kom thermal expansion thiab contraction cycles. Nyob rau lub sijhawm ua haujlwm ntev, deformation tuaj yeem tsim vim:
Maj mam creep ntawm structural steel nyob rau hauv load
Tsis sib xws thermal gradients hla ib cheeb tsam
Txhawb kev daws teeb meem lossis lub hauv paus so
Localized overloading nyob rau hauv central cheeb tsam
Qhov tshwm sim yog ntsuas qhov sib txawv los ntawm kev tsim flatness, tshwj xeeb tshaj yog nyob rau hauv kev khiav hauj lwm kub qhov twg expansion tshwm sim tau qhia tag nrho.
Flatness specifications feem ntau txhais ntawm qhov siab tshaj plaws ua haujlwm kub, ua rau hauv - kev kho qhov tseem ceeb.
Flatness Measurement thiab Surveying
Tsim ib lub dav hlau Thermal Reference Plane
Cov txheej txheem theem pib nrog kev ntsuam xyuas meej meej ua raws li kev tswj xyuas.
Lub platen yog thawj zaug stabilized ntawm idle khiav hauj lwm kub kom txo thermal distortion variation. Cov txheej txheem ntsuas muaj xws li:
Laser tracker systems rau tag nrho -mapping saum npoo
Precision straightedges ua ke nrog feeler gauges
Multi-point dial indicator scanning
Qhov saum npoo yog muab piv rau lub dav hlau siv los txheeb xyuas:
Cov ntsiab lus qis (sag zones)
Cov ntsiab lus siab (txhawb qhov chaw overloading)
Zone-rau-zone variation in multi-heater systems
Cov ntaub ntawv no tsim lub hauv paus rau kev suav shim.
Shim-Raws li Mechanical Correction
Tswj Kev Pabcuam Re-Leveling
Thaum deformation daim ntawv qhia tiav lawm, kev kho yog ua ntawm lub platen txhawb interface.
Lub platen yog ib nrab unloaded los ntawm raising xovxwm ram los yog relieving mechanical clamping rog. Precision- hauv av stainless hlau shims yog tom qab ntawd ntsia rau hauv cov ncej txhawb nqa.
Ib feem ntawm ib millimeter ntawm shim Tshuag tuaj yeem txuag tau ntau lab -dollar platen thaum siv kom raug.
Cov kauj ruam tseem ceeb suav nrog:
Txheeb xyuas cov ntsiab lus txhawb nqa sib xws rau thaj tsam qis
Xam qhov yuav tsum tau nqa ntawm txhua qhov chaw
Txhim kho shims ntawm tswj thickness
Ua kom muaj kev sib npaug ntawm kev faib khoom thoob plaws txhua qhov kev txhawb nqa
Kev saib xyuas yuav tsum tau ua kom tsis txhob overstressing tus ncej, raws li kev thauj khoom tsis sib xws tuaj yeem ua rau muaj kev cuam tshuam tshiab.
Thermal Cycling Verification
Rechecking nyob rau hauv kev ua hauj lwm tej yam kev mob
Tom qab pib shimming, lub platen rov qab mus rau tag nrho kev khiav hauj lwm kub. Kev nthuav dav cua sov tuaj yeem hloov pauv geometry me ntsis, yuav tsum tau ua pov thawj raws li kev ua haujlwm tiag tiag.
Lub voj voog ntsuas ntsuas suav nrog:
Cua sov kom siab tshaj plaws tsim kub
Stabilization ntawm thermal equilibrium
Re- ntsuas qhov flatness
Kev sib piv nrog cov kev txwv tsis pub dhau
Yog tias qhov sib txawv tseem tshuav, kev hloov kho shim ntxiv tau ua rov ua dua kom txog thaum ua tiav tiav.
Kev xav txog kev tsim thiab engineering
Load Redistribution Effects
Ntxiv cov khoom shim hloov kho tag nrho cov qauv kev thauj khoom. Raws li qhov tshwm sim:
Load tuaj yeem hloov mus rau cov kev txhawb nqa uas nyob ib sab
Cov kev ntxhov siab hauv zos tuaj yeem nce ntxiv
Lub hauv paus tiv thaiv rog tuaj yeem hloov pauv
Rau cov tshuab loj, kev tshuaj xyuas kev tsim vaj tsev yuav raug txiav txim siab kom siv tau qhov kev tso kawm shim thiab xyuas kom ntev - lub sij hawm txhua yam kev ncaj ncees.
Ncej -Kev kho kom ruaj khov
Thermal Stress Relief Consideration
Tom qab loj re-kev ua haujlwm shimming, kev ntxhov siab rov ua dua tshiab tshwm sim hauv cov qauv platen. Yog tias ua tau, lub voj voog tiv thaiv kev ntxhov siab yuav raug siv rau:
Stabilize cov kev ntxhov siab sab hauv
Txo cov teeb meem ntev - lub sij hawm creep
Txhim kho repeatability ntawm flatness nyob rau hauv lub voj voog
Cov kauj ruam no txhim kho qhov ntev - lub sij hawm seem stability tom qab kho tshuab.
Cov ntaub ntawv thiab kev tswj xyuas
Cov ntaub ntawv Shim Configuration
Txhua qhov chaw shim thiab thicknesses raug sau tseg rau kev saib xyuas yav tom ntej. Qhov no ua kom:
Rov ua dua thaum hloov kho yav tom ntej
Traceability ntawm cov qauv kev hloov kho
Kev daws teeb meem sai dua thaum rov tshwm sim dua
Cov ntaub ntawv tsim nyog dhau los ua qhov tseem ceeb rau ntau -zone systems nrog cov kab sib txuas sib txuas.
Xaus
Lub sagging cua sov platen tsis yog ib qho khoom seem tab sis ib qho kev ua kom zoo dua qub. Los ntawm kev ntsuas ceev, tswj qhov chaw tso tawm, thiab thermal- kev txheeb xyuas lub voj voog, qhov qub flatness tuaj yeem rov qab tau txawm tias tom qab xyoo ntawm kev pabcuam deformation.
Cov txheej txheem los ua kom qib ib qho sagging ntau cheeb tsam cua sov platen qhia tau hais tias loj - cov cuab yeej thermal tuaj yeem kho dua tshiab dua li hloov thaum ua haujlwm nrog qhov tseeb thiab ua siab ntev. Txawm tias cov cuab yeej hnyav tshaj plaws tuaj yeem rov ua haujlwm zoo los ntawm kev kho cov txheej txheem coj los ntawm kev ntsuas qhov tseeb thiab kev paub txog thermal.
