Kev ntsuas qhov ceev tsis tu ncua yog qhov tseem ceeb heev raukev tsim cov qauv siv quav ciabrau kev pov tseg peev, ncaj qha ua kom muaj kev ruaj khov ntawm qhov ntev, kev kwv yees tau qhov me me, thiab kev ncaj ncees ntawm qhov chaw/sab hauv—cov yam ntxwv uas hloov mus rau qhov kawg pov tseg. Qhov tsis sib xws ntawm qhov ceev ua rau muaj qhov tsis zoo xws li cov npuas cua, kev sau tsis tiav, lossis kev me me tsis sib xws, uas nce mus rau qhov tsis zoo ntawm kev pov tseg kim heev. Kev saib xyuas lub sijhawm tiag tiag tswj cov khoom xyaw quav ciab, cov kev txhaj tshuaj, thiab kev sib xws ntawm cov khoom siv, txo cov kev pheej hmoo thiab tuav qhov tseeb uas xav tau rau kev pov tseg peev txhim khu kev qha.
Vim li cas qhov zoo ntawm cov qauv quav ciab thiaj tseem ceeb
Lub hauv paus ntawm cov txheej txheem casting peev yog nyob rau qhov tseeb ntawm cov txheej txheem tsim cov qauv quav ciab. Txhua qhov kev hloov pauv ntawm qhov ntev, qhov tsis zoo ntawm qhov chaw, lossis qhov tsis sib xws sab hauv ntawm cov qauv quav ciab raug xa mus rau qhov casting kawg. Kev hloov pauv me me ntawm qhov ceev ntawm cov qauv quav ciab lossis kev sib xws ntawm cov kauj ruam tom ntej, ua rau muaj kev pheej hmoo ntawm qhov tsis zoo ntawm casting xws li shrinkage, qhov tsis ruaj khov ntawm qhov ntev, lossis qhov tsis zoo ntawm qhov chaw.
Cov Khoom Siv Casting Peev
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Qhov teeb meem tseem ceeb ntawm cov quav ciab yog qhov ua rau cov quav ciab me me. Thaum cov quav ciab uas yaj txias thiab khov hauv pwm, nws yuav raug kev sib txhuam linear thiab volumetric. Yog tias qhov ceev ntawm cov quav ciab sib xyaw tsis sib xws, qhov kev sib txhuam no yuav tsis paub tseeb, ua rau muaj kev phom sij rau qhov tseeb ntawm cov quav ciab thiab thaum kawg qhov ruaj khov ntawm qhov ntev hauv kev casting. Cov kev tshawb fawb qhia tau tias kev tswj cov quav ciab ceev - txawm tias muaj kev ntxiv cov khoom sau thiab cov resins - tuaj yeem txo qhov kev sib txhuam ntau dua 4%, txhim kho qhov kev tsim cov quav ciab siab siv hauv kev tsim khoom siv hauv aerospace thiab turbine castings.
Cov teeb meem ntawm qhov chaw ua tiav yog lwm qhov kev pheej hmoo uas cuam tshuam nrog qhov sib xws ntawm cov qauv quav ciab. Cov khoob, cov npuas dej, lossis cov khoom me me hauv cov quav ciab ua rau muaj qhov khawb ntawm qhov chaw sab hauv ntawm pwm. Yog li ntawd, kev tiv thaiv qhov tsis zoo ntawm kev nqis peev casting tsom mus rau kev tswj xyuas qhov zoo ntawm cov qauv quav ciab. Txawm tias muaj kev txhim kho cov txheej txheem dewaxing siab heev, yog tias muaj qhov tsis zoo ntawm cov qauv, cov qhov tsis zoo xws li kev kaw txias, cov chaw ntxhib, lossis kev sau tsis tiav tuaj yeem tshwm sim, ua rau cov nqi tsis lees paub thiab cov nqi nce ntxiv.
Qhov sib xws ntawm cov qauv cuam tshuam rau qhov ruaj khov ntawm qhov ntev thoob plaws hauv cov txheej txheem casting, tsis yog thaum lub sijhawm pib khov xwb tab sis kuj thaum lub sijhawm thauj mus los, kev tuav, thiab kev sib sau ua ke. Yog tias cov qauv quav ciab muaj lub zog lossis qhov ceev sib txawv, kev sib sau ua ke ntawm cov pawg yuav yooj yim rau kev tsis sib xws, sag, thiab tawg, ua rau muaj kev pheej hmoo ntawm kev ua yuam kev ntxiv. Kev saib xyuas zoo ntawm cov khoom zoo thiab cov kev tswj hwm ua rau muaj kev tswj hwm zoo ntawm cov khoom casting txij thaum pib.
Cov Hom Tshuaj Siv Ciab, Cov Khoom Sib Xyaws, thiab Lawv Cov Kev Cuam Tshuam
Cov qauv siv quav ciab sib xyaw ua ke tau tsim los kom muaj kev sib npaug ntawm kev txhaj tshuaj, kev yooj yim rhuav tshem, thiab kev ruaj khov ntawm cov qauv tiav. Cov quav ciab paraffin yog cov khoom siv dav tshaj plaws; nws ua rau nws yooj yim yaj thaum tuav cov quav ciab rau kev casting thiab ua rau sab nraud du. Cov yam ntxwv ntawm cov quav ciab paraffin—tshwj xeeb tshaj yog qhov melting point thiab purity—txiav txim siab ob qho tib si moldability thiab kev tswj hwm shrinkage hauv casting.
Stearic acid ua haujlwm ua ib qho plasticizer, ua rau paraffin mos thiab txhawb nqa ob qho tib si kev ywj pheej thiab kev ua haujlwm demolding. Kev tshuaj xyuas los ntawm cov phooj ywg qhia tias kev ua kom zoo dua qhov sib piv ntawm paraffin wax hauv kev casting, feem ntau ntawm lossis ze ntawm 1: 1 piv nrog stearic acid, ua rau muaj txiaj ntsig zoo dua rau kev pwm, kev tswj kev ntsws, thiab kev txhim kho qhov chaw casting. Cov piv txwv meej raug kho kom haum rau daim ntawv thov: cov ntsiab lus paraffin siab dua ua rau muaj zog thiab txo qhov tsis yooj yim ntawm cov qauv tab sis yuav ua rau muaj npuas lossis tsis ruaj khov rov qab yog tias siab dhau. Kev tsa cov feem pua ntawm stearic acid dhau qhov zoo tshaj plaws txhim kho kev tiv thaiv thermal thiab qhov chaw tiav tab sis yuav txo cov qauv kev ua haujlwm. Cov piv txwv ntawm 1: 1, tshwj xeeb tshaj yog nrog cov paraffin melting point siab dua (saum toj no 60 ° C), pom tias zoo tshaj plaws rau ntau cov qauv siv quav ciab dav dav.
Cov khoom ntxiv xws li beeswax, microcrystalline wax, lossis cov polymers me me feem ntau raug muab tso rau hauv cov khoom sib xyaw kom kho cov qauv wax rau cov kev xav tau tshwj xeeb. Beeswax txhim kho kev ductility thiab hloov kho cov yam ntxwv kho; microcrystalline wax txhim kho lub zog thiab txo cov noob me me, ua rau muaj qhov chaw zoo dua. Hauv qhov chaw uas xav tau ob qho tib si shrinkage tsawg thiab high-fidelity casting, multi-wax blends nrog paraffin (60%), beeswax (25%), microcrystalline (5%), thiab carnauba (10%) tau ua pov thawj tias shrinkage qis dua thiab zoo dua qhov chaw.
Qhov muaj thiab qhov sib piv ntawm cov khoom ntxiv tsis yog tsuas yog cuam tshuam rau lub cev xwb tab sis kuj tseem muaj cov khoom siv kho tshuab - lub zog ntawm cov qauv, kev ntev ntawm cov khoom, kev tiv taus thermal deformation, thiab txawm tias kev sib haum xeeb tshuaj lom neeg nrog cov plhaub ceramic slurries. Cov mis kom raug tiv thaiv kev ua tsis tiav ntawm kev tuav cov pawg, txo qhov kev cuam tshuam thaum lub sijhawm molding, thiab ua kom muaj kev ua tau zoo mus txog rau qhov kawg casting. Tsis tas li ntawd, kev tswj hwm qhov kub thiab txias ntawm kev txhaj tshuaj, lub zog molding siv, thiab lub sijhawm tuav yog qhov tseem ceeb npaum li kev xaiv cov quav ciab rau kev tswj hwm cov qauv quav ciab siab.
Kev ua kom zoo dua ntawm kev sib xyaw ua ke ntawm cov quav ciab yog ib qho txheej txheem uas siv cov ntaub ntawv los ua, thiab rov ua dua. Txhua qhov kev hloov pauv ntawm cov khoom siv—txawm tias yog cov khoom siv paraffin, stearic acid hauv cov quav ciab sib xyaw, lossis hom tshuaj ntxiv—tuaj yeem cuam tshuam rau tus nqi ntawm cov qauv uas yuav ntsws, kev nthuav dav ntawm thermal, thiab thaum kawg, cov txheej txheem tiv thaiv kev puas tsuaj ntawm cov khoom siv casting. Cov txiaj ntsig ntawm kev ua kom raug ntawm cov qauv, kev txo qis kev ntsws, thiab kev txhim kho qhov chaw yog qhov tseem ceeb rau cov txheej txheem dav dav ntawm kev tiv thaiv kev puas tsuaj ntawm cov khoom siv casting thiab kev txhim kho qhov chaw tiav ntawm cov khoom siv casting.
Kev Txhaj Tshuaj Rau Cov Qauv Siv Ciab: Kev Xav Txog Cov Txheej Txheem
Cov Kev Ntsuas Txhaj Tshuaj Molding thiab Chemistry ntawm Wax
Kev tswj hwm meej ntawmkev txhaj tshuaj moldingCov kev ntsuas yog qhov tseem ceeb rau cov txheej txheem tsim cov qauv quav ciab thiab tag nrho cov txheej txheem casting peev. Kev ncaj ncees thiab qhov tseeb ntawm cov qauv quav ciab rau kev casting raug cuam tshuam los ntawm qhov kub txhaj tshuaj, siab, thiab cov khoom ntws. Kev tswj qhov kub kom raug thaum lub sijhawm txhaj tshuaj yog qhov tseem ceeb rau cov khoom paraffin quav ciab thiab cov qauv nrog cov khoom ntxiv xws li stearic acid, vim tias qhov kub hloov pauv tuaj yeem hloov cov viscosity ntawm quav ciab los ntawm qhov kev txiav txim ntawm qhov loj. Qhov kub qis dua sai sai ua rau viscosity nce, ua rau cov pwm tsis tiav thiab qhov tsis zoo ntawm qhov chaw, thaum qhov kub ntau dhau yuav ua rau overfilling, qhov roughness ntawm qhov chaw, lossis shrinkage tsis tsim nyog.
Kev nias ua ob lub luag haujlwm: kev nias txhaj tshuaj txaus ua kom pwm puv, ntes cov ntsiab lus zoo uas tseem ceeb rau kev tsim cov qauv siv quav ciab siab, thaum kev nias ntau dhau ua rau muaj kev sib cavitation - tsim cov qhov khoob thiab cov kab nrib pleb sab hauv. Kev kho qhov ceev ntawm kev txhaj tshuaj tso cai rau cov chaw tsim khoom kom sib npaug lub sijhawm sau nrog cov ntsiab lus ntawm cov qauv, cuam tshuam rau ob qho tib si qhov tiav ntawm qhov chaw thiab qhov ua tau rau kev nqis peev casting qhov tsis zoo.
Cov tshuaj lom neeg ntawm cov quav ciab yog qhov tseem ceeb rau kev txhaj tshuaj. Kev hloov pauv ntawm cov piv ntawm cov quav ciab paraffin, cov ntsiab lus microcrystalline, thiab kev siv cov khoom ntxiv xws li cross-linked polystyrene lossis terephthalic acid ncaj qha hloov pauv qhov viscosity profile ntawm cov yaj. Piv txwv li, cov ntsiab lus paraffin ntau dua feem ntau txo cov viscosity, pab kom ntws tab sis ua rau muaj kev pheej hmoo ntawm cov cim poob lossis shrinkage ntau dhau. Ntawm qhov tod tes, kev ntxiv cov khoom sau tuaj yeem ua rau viscosity thiab lub zog kho tshuab nce ntxiv, tab sis, yog tias tsis tau faib zoo, yuav ua rau cov dej ntws thiab qhov zoo ntawm qhov chaw poob qis. Kev ua kom zoo dua yog rov ua dua thiab txuas nrog cov lus teb tiag tiag; kev rov ua dua cov txheej txheem kawm mus rau hauv kev hloov kho parameter yog qhov tseem ceeb hauv kev nqis peev casting qhov chaw ua tiav kev txhim kho.
Qhov kev sib cuam tshuam ntawm cov khoom sib xyaw ua ke ntawm cov quav ciab thiab cov txheej txheem txheej txheem yog qhov pom tseeb: piv txwv li, ib qho kev sib xyaw ua ke uas muaj polyethylene ntau yuav tsum tau kho qhov kub thiab siab ntawm kev txhaj tshuaj kom ntseeg tau tias pwm puv tag thiab tswj tus nqi shrinkage kom nyob hauv qhov txwv. Cov pov thawj ntawm kev sim qhia tau tias kev hloov kho viscosity tiag tiag - teb rau cov khoom sib xyaw ua ke thiab cov xwm txheej ib puag ncig - yog qhov tseem ceeb rau kev tswj hwm cov qauv kom zoo thiab txo qhov tsis zoo.
Kev Saib Xyuas Qhov Ceev thiab Qhov Zoo ntawm Cov Khoom Siv
Kev ntsuas qhov ceev tsis tu ncua thaum lub sijhawm txhaj tshuaj pwm yog qhov tsim nyog rau kev tswj hwm qhov zoo ntawm cov khoom siv casting thiab kev tswj hwm qhov nrawm ntawm kev poob qis hauv kev casting. Kev hloov pauv ntawm qhov ceev thaum lub sijhawm txhaj tshuaj tuaj yeem ua rau muaj qhov tsis sib xws hauv cov khoom siv ciab, kev sau pwm tsis tiav, lossis cua nkag - txhua yam tseem ceeb ua rau muaj qhov tsis zoo ntawm kev casting.
Lonnmeter, ua ib lub chaw tsim khoom ntawm cov ntsuas qhov ceev hauv kab, muab lub peev xwm rau kev taug qab lub sijhawm tiag tiag ntawm qhov ceev ntawm cov qauv quav ciab tam sim ntawd tom qab txhaj tshuaj. Cov cuab yeej no, ntsia rau ntawm kab txhaj tshuaj, xa cov kev ntsuas tas mus li, tso cai rau cov pab pawg zoo kom sai sai ntes tau qhov sib txawv ntawm qhov ntsuas qhov ceev teeb tsa. Txoj hauv kev no sib haum nrog cov kev coj ua zoo tshaj plaws pom zoo kom saib xyuas tas mus li thiab sau cov ntaub ntawv qhov ceev, uas qhia txog cov qauv thiab ua rau muaj kev saib xyuas cov khoom siv tam sim ntawd hauv kev ua haujlwm casting.
Kev ntsuas qhov ceev thiab kev sib xyaw ua ke tam sim ntawd qhia rau cov neeg ua haujlwm yog tias kev siv cov quav ciab uas yaj tas yuav tsum tau hloov kho - txawm tias los ntawm qhov kub, siab, lossis txawm tias qhov sib xyaw ntawm cov quav ciab hloov pauv. Cov qauv uas tsis sib xws ntawm qhov ceev feem ntau qhia txog kev ruaj khov ntawm qhov loj me hauv kev nqis peev casting, ua rau muaj kev hloov pauv me me thiab teeb meem tiav ntawm qhov chaw tom qab.
Cov kev tshawb fawb pom tau tias muaj kev sib txuas ncaj qha ntawm qhov ceev ntawm cov qauv sib xws thiab qhov tseeb ntawm qhov ntev ntawm cov castings kawg. Cov qauv uas muaj qhov ceev sib xws tsis yog tsuas yog tiv taus kev warping thaum lub sijhawm de-molding thiab kev tuav tab sis kuj txo qis qhov shrinkage tsis paub tseeb thaum lub sijhawm dewaxing txheej txheem optimization thiab ceramic plhaub firing. Cov kev tswj hwm ceev no ua rau cov qhov rai txheej txheem nruj dua thiab txhim kho qhov kev sib txuas ntawm cov qauv geometry thaum casting.
Kev saib xyuas tas mus li nrog cov cuab yeej meej pab txhawb kev tiv thaiv qhov tsis zoo, ua kom cov txheej txheem tsim cov qauv siv quav ciab rov ua dua, thiab tsim lub hauv paus ntawm cov txheej txheem tiv thaiv qhov tsis zoo. Los ntawm kev sib txuas cov txheej txheem, cov tshuaj lom neeg ntawm quav ciab, thiab kev taug qab qhov ceev, cov chaw tsim khoom tuaj yeem xa cov qauv quav ciab zoo sib xws, tsim rau cov ntawv thov casting.
Kev Ruaj Ntseg ntawm Qhov Ntev, Qhov Ntsws, thiab Qhov Tiav Ntawm Qhov Chaw
Tswj Kev Ntsws thiab Tswj Xyuas Qhov Tseeb ntawm Qhov Ntev
Thaum lub sijhawm ua cov txheej txheem casting, cov qauv quav ciab raug cua sov contraction thaum nws txias thiab khov. Qhov kev contraction no, hu ua shrinkage, yog qhov tseem ceeb ntawm kev ruaj khov ntawm qhov ntev rau cov khoom kawg casting. Qhov kev contraction tshwm sim hauv ob theem: thawj zaug txias hauv pwm thiab ntxiv shrinkage tom qab demolding raws li cov quav ciab sib npaug nrog ib puag ncig. Ob theem yog cuam tshuam los ntawm cov quav ciab sib xyaw, cov khoom pwm, geometry, thiab qhov kub thiab txias.
Cov roj hmab paraffin uas siv rau hauv kev tsim cov qauv roj hmab, qhia tau tias muaj kev cuam tshuam loj heev rau qhov hloov pauv ntawm qhov kub. Cov qauv ua los ntawm cov roj hmab paraffin uas tsis tau ntim yuav pom qhov hloov pauv loj dua - txog li ± 0.4% ntawm qhov ntev - dhau 24 teev thaum raug rau qhov kub hloov pauv, piv rau cov roj hmab sib xyaw uas tau ntim. Cov pwm roj hmab silicone qhia qhov hloov pauv tsawg tshaj plaws ntawm cov khoom pwm, muab qhov txo qis hauv kev ntsws rau cov qauv roj hmab paraffin.
Cov qauv khoom siv, tshwj xeeb tshaj yog kev siv cov khoom sau xws li hmoov txhuv nplej siab thiab teraphenolic resin, ua lub luag haujlwm tseem ceeb. Cov khoom sau tuaj yeem txo qhov kev ntsws linear los ntawm kwv yees li 4.5% yam tsis muaj kev cuam tshuam rau qhov zoo ntawm qhov chaw. Cov quav ciab uas muaj ntau heev tsis yog tsuas yog ua kom qhov loj me ruaj khov xwb tab sis kuj ua rau qhov ntsws tsis tshua muaj kev cuam tshuam rau qhov kub thiab txias ib puag ncig.
Cov txheej txheem txheej txheem kuj tseem ceeb heev. Qhov kub ntawm kev txhaj tshuaj, qhov siab tuav, thiab lub sijhawm tuav qhia txog keeb kwm thermal, kev ntxhov siab sab hauv, thiab qhov sib xws ntawm cov quav ciab sau. Kev kho kom raug ntawm cov kev ntsuas no, xws li nrog Taguchi L9 orthogonal optimization, ua rau muaj kev hloov pauv tsawg dua hauv kev ntsws. Rau cov khoom nyuaj heev lossis qhov ntev rhiab heev, kev tshuaj xyuas cov khoom kawg (FEA) yog qhov tseem ceeb. FEA ua rau muaj kev kwv yees tseeb thiab kho qhov ntsws, warpage, thiab lwm yam kev hloov pauv ntawm theem tsim. Piv txwv li, cov qauv hniav turbine tsim nrog FEA-guided parameters qhia tau tias muaj kev warping tsawg dua, raws li tau lees paub los ntawm cov tshuab ntsuas kev sib koom tes thiab kev tshuaj xyuas qhov muag.
Kev soj ntsuam qhov ceev tiag tiag thaum lub sijhawm txhaj tshuaj siv quav ciab ua pov thawj thiab kho cov kev sim ua kom haum rau cov xwm txheej tiag tiag. Kev ntsuas tas mus li no txhawb nqa kev hloov kho cov txheej txheem, yog li tswj hwm qhov kev tso cai shrinkage thiab xyuas kom meej qhov tseeb ntawm qhov ntev. Kev siv cov ntsuas qhov ceev hauv kab, xws li cov uas tsim los ntawm Lonnmeter, tau pom tias muab cov lus teb tam sim ntawd uas tseem ceeb rau kev them nyiaj thaum lub sijhawm tsim cov qauv siv quav ciab.
Daim duab qhia hauv qab no qhia txog qhov nrawm ntawm cov qauv siv quav ciab ua haujlwm ntawm paraffin-filler ratios thiab ambient temperature:
| Kev Tsim Cov Tshuaj Ciab | Qhov Kub Ib puag ncig -5°C | 20°C | 35°C |
|-------------------|-------------------|------|------|
| Cov Paraffin Ntshiab | +0.31% | 0.00%| -0.11%|
| Paraffin + 10% Hmoov Nplej | +0.10% | 0.00%| -0.03%|
| Paraffin + 10% TP Resin | +0.12% | 0.00%| -0.04%|
| Pwm Silicone (Zoo Tshaj Plaws) | +0.05% | 0.00%| -0.01%|
Qhov no qhia tau hais tias ob qho tib si kev tsim qauv thiab kev tswj hwm ib puag ncig yog qhov yuav tsum tau ua kom tsis txhob ntsws rau kev tsim cov qauv siv quav ciab siab.
Ua tiav qhov zoo tshaj plaws ntawm qhov chaw tiav
Qhov ua tiav ntawm cov qauv siv quav ciab muaj qhov cuam tshuam ncaj qha rau kev txhim kho qhov ua tiav ntawm qhov chaw pov tseg thiab kev tiv thaiv qhov tsis zoo. Tus cwj pwm ntawm qhov chaw feem ntau yog tswj hwm los ntawm kev tsim cov quav ciab thiab kev tswj hwm qhov tseeb ntawm cov txheej txheem txhaj tshuaj molding. Cov qauv du txo qhov kev pheej hmoo ntawm qhov tsis zoo ntawm qhov chaw pov tseg thiab ua rau yooj yim rhuav tshem.
Qhov piv ntawm paraffin wax rau stearic acid hauv kev sib xyaw yog qhov tseem ceeb rau kev tswj qhov zoo ntawm qhov chaw. Kev nce qhov feem pua ntawm stearic acid, ntawm 5% txog 15%, tau pom tias txhim kho qhov du ntawm qhov chaw thiab txhim kho demolding. Stearic acid ua haujlwm ua plasticizer, txhawb cov khoom ntws ntawm cov quav ciab thaum lub sijhawm txhaj tshuaj thiab ua rau cov pwm zoo dua. Qhov sib piv ze ntawm paraffin rau stearic acid (piv txwv li, 1: 1) tau txais patent rau kev tsim cov txiaj ntsig zoo tshaj plaws: qis dua shrinkage, zoo dua qhov ntev, thiab kev txhim kho qhov tiav ntawm qhov chaw.
Txawm li cas los xij, qhov txiaj ntsig yog qhov sib txawv - cov stearic acid ratios siab dua txo qis kev ntsws tab sis yuav hloov pauv cov quav ciab ntws thiab cov khoom kho yog tias dhau qhov txwv zoo tshaj plaws. Cov paraffin-stearic acid sib xyaw cuam tshuam rau rheology ntawm cov quav ciab molten, cuam tshuam rau ob qho tib si tiav ntawm qhov chaw thiab sab hauv qauv ceev. Yog li ntawd, kev saib xyuas zoo ntawm cov khoom siv thiab kev tswj hwm cov txheej txheem nruj yog qhov tseem ceeb thaum lub sijhawm tuav cov quav ciab molten rau casting.
Cov txheej txheem txhaj tshuaj pwm ntawm cov qauv siv quav ciab - tshwj xeeb tshaj yog qhov kub thiab siab - kuj muaj feem cuam tshuam loj heev. Qhov viscosity ntawm cov quav ciab, uas tuaj yeem hloov pauv ntawm qhov ntau thiab tsawg ntawm 60 ° C thiab 90 ° C, txiav txim siab qhov tiav thiab qhov tseeb ntawm kev sau pwm. Qhov kub lossis siab tsis txaus ua rau kev sau tsis tiav, txias kaw, qhov chaw burrs, thiab roughness. Ntawm qhov tod tes, cov txheej txheem zoo tshaj plaws txhim kho cov quav ciab ntws, ua rau cov qauv nrog cov ntsiab lus zoo dua thiab qhov tsis sib xws ntawm qhov chaw tsawg kawg nkaus.
Cov ntaub ntawv duab qhia txog qhov cuam tshuam ntawm stearic acid ratio ntawm qhov nruab nrab ntawm qhov roughness ntawm qhov chaw (Ra):
| Stearic Acid (%) | Qhov nruab nrab ntawm qhov chaw Roughness Ra (µm) |
|------------------|-------------------------------------|
| 0 | 1.7 |
| 5 | 1.3 |
| 10 | 1.0 |
| 15 | 0.9 |
Qhov no qhia tau hais tias kev nce ntxiv ntawm cov stearic acid hauv cov qib tswj tau ua rau cov qauv siv quav ciab du thiab zoo rau cov txheej txheem casting downstream.
Hauv kev xaus lus, kev tswj hwm cov yam tseem ceeb - kev ntsws thiab qhov ua tiav ntawm qhov chaw - vam khom kev sib koom ua ke ntawm kev xaiv cov quav ciab sib xyaw, kev ntsuas cov txheej txheem tiag tiag, kev ua kom zoo dua ntawm cov txheej txheem, thiab kev tswj hwm cov yam ntxwv ib puag ncig thiab kev txhaj tshuaj. Txoj hauv kev holistic no txhawb nqa kev tsim cov qauv quav ciab siab, kev tiv thaiv kev puas tsuaj ntawm kev nqis peev, thiab qhov zoo tshaj plaws ntawm qhov chaw kawg hauv kev castings.
Kev Tswj Xyuas Qhov Sib Piv Paraffin thiab Kev Tswj Xyuas Additive
Kev tswj qhov tseeb ntawm cov piv ntawm cov roj paraffin hauv kev tsim cov qauv roj yog lub hauv paus rau cov txheej txheem casting. Qhov sib piv ntawm cov roj paraffin hauv kev sib xyaw hloov cov lus teb ntawm cov khoom siv tseem ceeb: kev ua kua rau kev txhaj tshuaj molding, lub zog kho tshuab, thiab kev ua haujlwm ntawm kev tshem tawm cov qauv thaum lub sijhawm dewaxing. Kev kho kom zoo dua cov yam ntxwv no hais txog kev tiv thaiv qhov tsis zoo ntawm casting thiab kev tsav tsheb rau kev txhim kho qhov chaw tiav thiab qhov tseeb ntawm qhov ntev.
Cov roj hmab paraffin, thaum muaj ntau dua - txog li 40-45 wt% - ua rau cov roj hmab sib xyaw ua ke muaj zog dua thiab txo lawv qhov tsis muaj zog rau kev hloov pauv thermal. Cov khoom sib xyaw no txhawb nqa kev nqus zog thaum lub sijhawm tuav thiab ua, ua rau cov qauv muaj kev ua haujlwm zoo thiab ruaj khov. Txawm li cas los xij, cov roj hmab paraffin ntau dhau tuaj yeem ua rau lub zog ntawm cov khoom siv tsis ruaj khov los ntawm kev ua rau lub network siv lead ua tsis ruaj khov, uas ua rau cov qauv tsis muaj zog thiab tuaj yeem ua rau muaj qhov tsis meej lossis cov kab nrib pleb me me uas tshwm sim thaum lub sijhawm dewaxing lossis casting hlau.
Kev tswj tus nqi shrinkage thiab qhov ruaj khov ntawm qhov ntev tseem txuas ncaj qha rau cov ntsiab lus paraffin. Qhov sib npaug ntawm paraffin tswj hwm tus cwj pwm yaj thiab kev txias ua rau muaj kev sib txhuam, ob qho tib si tseem ceeb cuam tshuam rau qhov kawg geometry ntawm cov qauv siv quav ciab rau kev casting. Piv txwv li, cov qauv nrog cov piv paraffin tsis zoo yuav ua rau muaj kev sib txhuam ntau ntxiv lossis volumetric, cuam tshuam rau pwm-haum thiab qhov zoo ntawm casting. Kev khaws qhov sib npaug no ua rau ob qho tib si cov qauv siv quav ciab txhaj tshuaj molding thiab kev hloov pauv ntawm qhov chaw.
Kev xaiv cov khoom ntxiv—tshwj xeeb tshaj yog kev siv stearic acid—ua kom tiav qhov kev tswj hwm paraffin piv hauv kev kho kom zoo nkauj cov quav ciab sib xyaw ua haujlwm. Stearic acid hloov kho crystallization, txhawb nqa denser thiab loj dua crystallites uas muab kev sib xyaw ua ke thiab kev ua haujlwm shear ntau dua. Nrog paraffin-stearic acid sib xyaw, qhov kev ua kom zoo dua ntawm qhov sib piv no tsis yog tsuas yog txhawb nqa kev ua haujlwm ruaj khov xwb tab sis kuj tseem ua rau cov txheej txheem dewaxing ntseeg tau. Tsim kom zoo, cov sib xyaw no tsim cov qauv uas demold huv si thiab ua rau qhov tiav ntawm qhov chaw zoo dua ntawm cov castings. Yog tias stearic acid concentration poob qis dhau, txawm li cas los xij, cov tshuaj tsis xav tau (xws li saponification) yuav tshwm sim, ua rau muaj kev pheej hmoo ntawm qhov chaw roughness thiab txawm tias pwm puas tsuaj.
Cov kev xaiv cov khoom siv no yog cov kev coj ua zoo saib xyuas zoo. Cov khoom sib xyaw yuav tsum tau ntsuas qhov ceev tsis tu ncua kom paub tseeb tias muaj qhov sib xws thiab nrhiav tau cov khoom tsis huv nrog cov roj av lossis cov khoom me me. Cov txheej txheem niaj hnub no hu rau ob qho kev tshuaj xyuas hauv chaw kuaj mob - siv cov txheej txheem xws li roj chromatography thiab kev ntsuas calorimetry sib txawv los tsim cov cim ntiv tes - thiab kev sim lub cev hauv cov txheej txheem rau cov khoom tseem ceeb xws li qhov chaw yaj thiab viscosity. Cov kev ntsuas lub cev sib xws qhia txog kev sib xyaw ua ke, txhawb nqa kev ruaj khov thiab kev tiv thaiv qhov tsis zoo.
Cov chaw tsim khoom siv cov cuab yeej ntsuas tas mus li - zoo li cov ntsuas qhov ceev uas Lonnmeter tsim - los xa cov lus teb tiag tiag thaum lub sijhawm ua haujlwm rau kev ua cov quav ciab. Cov cuab yeej no, koom ua ke rau hauv cov kab tsim khoom, tso cai rau kev saib xyuas ze ntawm cov khoom siv paraffin ntawm txhua theem. Ua ke nrog cov txheej txheem kuaj mob tsis tu ncua rau kev tshuaj xyuas cov khoom tsis huv thiab kev txheeb xyuas microstructural, txoj hauv kev no tsim cov ntaub thaiv zoo tiv thaiv kev hloov pauv zoo.
Kev saib xyuas tas li ua rau muaj kev kho tam sim ntawd ntawm cov piv ntawm paraffin lossis cov qib ntxiv, txhawb nqa cov nqi shrinkage ruaj khov thiab qhov tseeb ntawm cov qauv rov ua dua. Hauv cov chaw tsim khoom, cov ntaub ntawv sib xyaw los ntawm cov txheej txheem ntsuas inline tuaj yeem suav nrog rau hauv cov txheej txheem tswj kev zoo dav dua, xyuas kom meej tias txhua pawg ua raws li cov qauv tsim qauv siv quav ciab thiab cov kev cai lij choj.
Hauv kev xaus lus, kev ua tiav qhov sib piv ntawm cov roj paraffin zoo tshaj plaws thiab kev tswj cov khoom ntxiv - tshwj xeeb tshaj yog stearic acid - xav tau ib qho kev tsim qauv sib xyaw ua ke, kev tswj hwm cov txheej txheem tiag tiag, thiab kev ntsuas tas mus li. Txoj kev no ua kom muaj kev coj ua zoo ntawm cov khoom siv, kev tshem tawm cov roj zoo, thiab cov qauv roj zoo sib xws uas tseem ceeb rau cov txiaj ntsig casting siab.
Kev Ua Haujlwm Dewaxing thiab Kev Tiv Thaiv Qhov Tsis Zoo ntawm Casting
Kev Ua Haujlwm Zoo ntawm Kev Tshem Tawm Wax Txuas Nrog Cov Khoom Siv Wax
Cov qauv ntawm cov quav ciab ua lub luag haujlwm tseem ceeb hauv cov kauj ruam dewaxing ntawm cov txheej txheem casting peev. Qhov kev nthuav dav thermal thiab cov cwj pwm yaj ntawm cov khoom sib xyaw quav ciab cuam tshuam ncaj qha rau lub plhaub ceramic robust. Paraffin quav ciab, nrog nws tus nqi qis thiab cov yam ntxwv txhaj tshuaj molding zoo, nthuav dav sai thaum sov. Yog tias tsis tswj hwm zoo, qhov kev nce volumetric sai no ua rau muaj kev nyuaj siab sab hauv ntau dhau uas tuaj yeem tawg lub plhaub, tshwj xeeb tshaj yog nyob ze cov cheeb tsam nyias lossis geometrically complex. Qhov sib piv, microcrystalline quav ciab lossis quav ciab nrog kev tswj hwm stearic acid ntxiv tuaj yeem muab cov mos mos maj mam thiab qis dua qhov kev nthuav dav, txo qhov kev pheej hmoo ntawm lub plhaub tawg thaum lub sijhawm dewaxing.
Qhov piv ntawm paraffin-rau-stearic acid yuav tsum sib npaug. Cov stearic acid siab dua yuav txo qhov viscosity ntawm cov quav ciab, ua rau cov quav ciab uas yaj tau ntws zoo dua thiab txo qhov muaj feem yuav tsis muaj cov khoom seem thiab cov khib nyiab. Txawm li cas los xij, cov stearic acid ntau dhau tuaj yeem ua rau qhov nrawm ntawm kev nthuav dav, ua rau muaj kev pheej hmoo ntawm kev tawg. Kev kho kom raug ntawm cov mis - xws li kev txwv cov theem stearic acid thiab siv kev ntsuas kev nthuav dav thermal hauv cov txheej txheem - pab sib phim cov khoom quav ciab nrog lub zog ntawm lub plhaub thiab cov yam ntxwv tshwj xeeb ntawm autoclave lossis lub tshuab cua sov dewaxing.
Cov ntaub ntawv sim ua pov thawj tias cov quav ciab uas muaj cov yam ntxwv zoo tshaj plaws ntawm kev ntsws thiab kev nthuav dav txo qhov tshwm sim ntawm cov qhov tsis zoo xws li cov kab nrib pleb thiab kev tshem tawm cov quav ciab tsis tiav. Cov qauv phab ntsa tuab sib xws thiab cov tub ntxhais lossis qhov cua tso rau hauv qhov chaw zoo pab txo qhov siab thiab txhawb kev ntws dej kom huv si. Kev tsim qhov cua, kev nias autoclave sai, thiab kev tswj hwm qhov kub yog cov tswv yim tau ua pov thawj los txo qhov kev puas tsuaj thaum lub sijhawm tshem tawm cov quav ciab paraffin sai.
Kev tshem tawm cov quav ciab tsis tiav lossis kev yaj tsis sib npaug ua rau cov khoom seem daig rau ntawm qhov chaw ntawm lub plhaub ceramic, ua rau muaj kev pheej hmoo ntawm cov qhov tsis zoo. Txhawm rau daws qhov no, cov txheej txheem dewaxing yuav tsum tau sib phim nrog cov qauv sib xyaw - xav tau kev saib xyuas zoo ntawm cov cwj pwm yaj thiab cov qauv kub ntawm lub plhaub. Kev siv cov txheej txheem dewaxing xws li FlashFire - cuam tshuam nrog kev tiv thaiv roj inert - tuaj yeem tiv thaiv cov plhaub los ntawm kev ua tsis tiav lossis kev hlawv quav ciab, tshwj xeeb tshaj yog nyob rau hauv cov qauv paraffin lossis cov qauv quav ciab sib xyaw.
Tiv Thaiv Cov Kev Ua Phem Los Ntawm Kev Tswj Xyuas Txheej Txheem
Kev tswj hwm zoo ntawm cov txheej txheem tsim cov qauv siv quav ciab yog lub hauv paus rau kev tiv thaiv qhov tsis zoo ntawm kev nqis peev casting. Kev hloov pauv ntawm qhov ceev, cov khoom sib xyaw, thiab qhov ruaj khov ntawm cov qauv siv quav ciab kis mus rau qhov zoo ntawm lub plhaub ceramic, thiab tom qab ntawd, mus rau cov hlau cam khwb ciab. Cov qauv uas muaj qhov tsis sib xws ntawm qhov ceev lossis cov nqi shrinkage tsis zoo tuaj yeem ua rau lub plhaub tsis muaj zog hauv zos, ua rau muaj kev pheej hmoo ntawm kev ua tsis tiav ntawm lub plhaub lossis casting tsis lees paub nrog cov qhov saum npoo, kev khiav tsis raug, lossis qhov tsis sib xws ntawm qhov ntev.
Kev saib xyuas tas mus li ntawm qhov ceev ntawm cov qauv quav ciab, tej zaum los ntawm cov ntsuas qhov ceev hauv kab xws li cov uas tsim los ntawm Lonnmeter, pab ua kom muaj kev tsim cov qauv quav ciab raug siab. Los ntawm kev lees paub qhov sib xws ntawm cov khoom siv paraffin wax thoob plaws txhua tus qauv txhaj tshuaj, cov kws ua haujlwm txheej txheem tuaj yeem ntes tau cov teeb meem xws li cov quav ciab txias lossis tsis sib xyaw zoo ua rau muaj qhov khoob, cua nkag, lossis cov noob ntoo. Kev kuaj pom thaum ntxov thiab kev kho cov txheej txheem ntawm theem no tiv thaiv kev tshwm sim tom qab ntawm cov kab nrib pleb lossis qhov tsis ruaj khov thaum lub sijhawm dewaxing thiab nchuav hlau.
Qhov chaw puas thiab qhov loj ntawm cov khoom feem ntau yog vim tsis siv lossis tsis ua raws li cov khoom sib xyaw ua ke - xws li qhov kub thiab txias hloov pauv, dej noo ntau dhau, lossis kev ua qias tuaj thaum lub sijhawm txhaj tshuaj pwm. Kev saib xyuas cov khoom zoo thiab kev tswj hwm ib puag ncig (kub thiab av noo) thaum lub sijhawm txhaj tshuaj pwm pwm ua rau qhov chaw tiav ntawm cov pwm zoo dua thiab txo qhov kev pheej hmoo ntawm kev poob qis.
Cov txheej txheem dewaxing, tshwj xeeb tshaj yog qhov ceev thiab kev sib xws ntawm lub plhaub cua sov, yuav tsum tau tswj hwm kom meej kom tiv thaiv lub plhaub kom ruaj khov. Kev saib xyuas qhov kub nce, lub plhaub permeability, thiab kinetics evacuation cia rau kev cuam tshuam sai yog tias pom muaj qhov tsis zoo - xws li kev sib sau ua ke ntau dhau lossis kev tshem tawm tsis tiav -. Kev tswj hwm cov txheej txheem hauv kab, ua ke nrog cov ntaub ntawv ntawm qhov ceev ntawm cov quav ciab thiab cov khoom sib xyaw, ua rau cov chaw tsim khoom tswj tau qhov ntev thiab txo cov qhov tsis zoo uas cuam tshuam nrog kev ua tsis tiav ntawm lub plhaub, kev sib xyaw ntawm qhov chaw, lossis kev castings tsis kam.
Kev tshuaj xyuas cov hauv paus tseem ceeb ntawm cov teeb meem uas tshwm sim ntau - xws li kev tawg ntawm lub plhaub thiab cov khoom sib xyaw ntawm qhov chaw mus rau qhov chaw me me - qhia tau tias kev cuam tshuam ua ntej ntawm kev tuav cov quav ciab thiab cov theem dewaxing yog txoj hauv kev zoo tshaj plaws rau kev tiv thaiv qhov tsis zoo ntawm kev casting. Nrog rau kev kam rau siab ntawm kev nqis peev casting los ua nruj dua, kev sib koom tes ntawm kev npaj cov khoom siv tswj hwm, kev saib xyuas cov txheej txheem kom raug, thiab kev ua kom zoo tshaj plaws ntawm kev dewaxing yog qhov tseem ceeb rau kev ua tiav ob qho tib si lub plhaub pwm ruaj khov thiab cov castings kawg tsis muaj qhov tsis zoo.
Kev Ntsuas Txuas Ntxiv thiab Kev Koom Tes QA
Kev ntsuas tas mus li ntawm qhov ceev thiab kev sib xws ntawm cov qauv quav ciab yog lub hauv paus tseem ceeb ntawm kev lees paub zoo hauv kev tsim cov qauv quav ciab siab. Muaj ob txoj hauv kev tseem ceeb: kev ntsuas qauv mus rau qauv thiab kev ntsuas hauv kab. Kev ntsuas qauv mus rau qauv yog nyob ntawm kev xaiv cov khoom los ntawm kev tsim khoom, tom qab ntawd ntsuas lawv qhov hnyav, qhov loj me, lossis kev hloov chaw kom xam qhov ceev. Txawm hais tias yooj yim, txoj kev no ua rau muaj kev ncua sijhawm ntawm qhov tshwm sim ntawm kev hloov pauv thiab kev kuaj pom, uas ua rau cov qauv tsis raws li qhov kev qhia txuas ntxiv mus yam tsis pom.
Kev ntsuas inline daws cov teeb meem no los ntawm kev koom ua ke cov platform sensor ncaj qha rau hauv cov txheej txheem txhaj tshuaj pwm. Cov ntsuas qhov ceev inline, xws li cov uas tsim los ntawm Lonnmeter, saib xyuas cov yam ntxwv xws li cov huab hwm coj, qhov ntim hloov pauv, lossis cov neeg sawv cev ceev hauv lub sijhawm tiag tiag thaum lub sijhawm tsim khoom. Piv txwv li, lub ntsuas qhov ceev inline tuaj yeem ntsia tau rau hauv qab ntawm lub tshuab txhaj tshuaj kom taug qab cov qauv ceev ntawm txhua tus qauv quav ciab thaum nws tawm ntawm pwm. Kev hloov pauv ntawm cov qhov ceev teeb tsa tam sim ntawd ua rau muaj kev ceeb toom lossis kev hloov kho cov txheej txheem, txo qhov kev pheej hmoo ntawm kev nqis peev casting tsis zoo thiab ruaj khov ob qho tib si shrinkage tus nqi thiab qhov tseeb ntawm qhov ntev.
Cov ntsuas viscosity inline siab heev ua kom tiav qhov kev saib xyuas qhov ntom ntom los ntawm kev ntsuas cov yam ntxwv ntws ntawm cov quav ciab uas yaj. Txij li thaum qhov sib piv ntawm cov quav ciab paraffin rau stearic acid thiab lwm yam khoom ntxiv cuam tshuam rau ob qho tib si cov khoom ntws thiab cov qauv khov kho, cov ntaub ntawv viscosity tiag tiag muab cov lus tawm tswv yim zoo rau kev tswj hwm cov khoom sib xyaw ua ke zoo tshaj plaws. Hauv kev xyaum, cov teeb liab sensor los ntawm cov ntsuas qhov ntom ntom thiab viscosity tau koom ua ke rau hauv cov txheej txheem tsim cov qauv quav ciab, tsav kev tswj hwm nruj ntawm ob qho tib si cov khoom sib xyaw ua ke thiab kev tuav cov quav ciab yaj rau kev casting.
Txawm hais tias Lonnmeter tsom mus rau kev siv cov cuab yeej ntsuas lub cev, cov sensors tau tsim los tso tawm cov ntaub ntawv txuas ntxiv mus, qhov kev daws teeb meem siab uas tseem ceeb rau kev sau ntawv thiab kev taug qab cov txheej txheem. Txhua qhov kev nyeem ceev tuaj yeem sib phim nrog cov cim qhia tus qauv tshwj xeeb - xws li cov lej batch lossis cov cim digital - tsim cov ntaub ntawv zoo sib xws uas txuas ntxiv los ntawm kev txhaj tshuaj quav ciab mus rau kev sib dhos pwm.
Cov ntaub ntawv zoo no ua haujlwm ntau yam tseem ceeb:
- Tshawb pom qhov tsis zoo tam sim ntawd thiab tiv thaiv qhov tsis zoo ntawm kev nqis peev hauv casting, los ntawm kev ua kom muaj kev teb rau qhov sib txawv ntawm cov khoom sib xws, qhov ceev, lossis viscosity.
- Kev txhim kho cov txheej txheem mus sij hawm ntev, ua rau muaj kev tshuaj xyuas rov qab ntawm cov qauv ceev, cov khoom siv paraffin, thiab lawv cov teebmeem rau kev ruaj khov ntawm cov qauv siv quav ciab lossis qhov chaw tiav.
- Kev taug qab tag nrho, los ntawm kev tswj hwm cov ntaub ntawv ntsuas digital thoob plaws hauv kev tsim khoom. Qhov no txhawb nqa cov kev cai lij choj hauv kev lag luam muaj kev ntseeg siab thiab tso cai rau kev tsom mus rau qhov tseeb thaum lub sijhawm tshawb nrhiav qhov tsis zoo ntawm kev casting.
Cov ntaub ntawv uas cov ntsuas inline xws li cov los ntawm Lonnmeter feem ntau yog mapped rau cov yam ntxwv ntawm tus qauv suav nrog qhov sib txawv ntawm qhov ceev, cov qauv ntawm qhov ntsws, thiab lwm yam tseem ceeb uas cuam tshuam rau cov txheej txheem casting. Ua piv txwv, kev nyeem qhov ceev sab nraum qhov ntau thiab tsawg uas tau teev tseg ua ntej tuaj yeem qhia txog teeb meem hauv cov piv ntawm paraffin wax, qhov kub thiab txias hloov pauv, lossis kev tuav tsis raug, tag nrho cov no tuaj yeem txheeb xyuas thiab daws tau sai kom tiv thaiv qhov tsis zoo thiab txhim kho qhov chaw casting.
Cov duab kos qhia txog cov qauv ntom ntom ntawm cov quav ciab raws sijhawm, tsim los ntawm cov ntaub ntawv ntsuas hauv kab, yog ib qho cuab yeej tseem ceeb rau cov neeg ua haujlwm thiab cov kws ua haujlwm. Cov duab no pab txheeb xyuas cov txheej txheem hloov pauv sai sai - txawm tias yog cyclical, random, lossis systematic - uas tom qab ntawd tuaj yeem sib raug zoo nrog cov xwm txheej ua haujlwm lossis kev hloov pauv ntawm cov khoom siv, kom ntseeg tau tias cov khoom siv zoo saib xyuas hauv kev casting.
Kev ntsuas tas mus li, kev ntsuas hauv kab thiab kev sib koom ua ke ntawm cov ntaub ntawv QA ua rau cov qauv siv quav ciab txo qis kev tshuaj xyuas tes, ua kom cov khoom siv ntau ntxiv, thiab txhim kho cov txiaj ntsig ntawm kev ua haujlwm casting: qhov tseeb ntawm qhov ntev, kev tswj qhov ntsws, thiab qhov zoo ntawm qhov chaw. Txoj hauv kev no muab txoj hauv kev uas muaj qauv thiab kuaj xyuas tau los txo cov qhov tsis zoo thiab txhim kho qhov rov ua dua ntawm cov qauv siv quav ciab siab thoob plaws txhua daim ntawv thov casting.
Cov Lus Nug Feem Ntau
Qhov tseem ceeb ntawm kev ntsuas qhov ceev tas mus li hauv kev tsim cov qauv siv quav ciab yog dab tsi?
Kev ntsuas qhov ceev tsis tu ncua ua lub hauv paus tseem ceeb ntawm kev tsim cov qauv quav ciab. Qhov ceev sib xws ua kom cov qauv quav ciab rov ua cov qauv tsim qauv kom raug, qhov tseem ceeb rau kev ua tiav ntawm cov txheej txheem casting. Kev hloov pauv ntawm qhov ceev quav ciab cuam tshuam ncaj qha rau qhov ruaj khov ntawm qhov ntev, qhov nrawm ntawm kev ntsws, thiab qhov zoo ntawm qhov chaw tiav ntawm cov qauv. Qhov ceev tsis sib xws tuaj yeem ua rau muaj cua nkag, sau tsis tiav, thiab qhov tsis zoo sab hauv, uas thaum kawg ua rau muaj kev pheej hmoo ntawm kev casting tsis zoo lossis rov ua haujlwm. Kev kuaj pom thaum ntxov ntawm cov kev tsis sib xws - tshwj xeeb tshaj yog nrog cov ntsuas qhov ceev inline zoo li cov uas tsim los ntawm Lonnmeter - ua rau muaj kev hloov kho cov txheej txheem tam sim ntawd. Qhov no ua rau cov txheej txheem tsim khoom zoo dua, kev kam rau siab dua, thiab kev txhim kho qhov tseeb ntawm qhov chaw hla ob qho tib si kev coj ua ib txwm muaj thiab kev ua qauv sai rau cov qauv quav ciab rau casting. Kev ntsuas ncaj qha, lub sijhawm tiag tiag muab kev saib xyuas zoo ntawm cov khoom siv hauv casting thiab txhawb nqa kev teb sai hauv cov chaw muaj txiaj ntsig zoo, ua rau nws tseem ceeb rau kev tswj hwm zoo ntawm cov khoom siv casting thiab cov txheej txheem tiv thaiv qhov tsis zoo casting.
Qhov piv ntawm cov roj paraffin cuam tshuam li cas rau kev tsim cov qauv roj?
Qhov piv ntawm cov tshuaj paraffin hauv kev sib xyaw ua ke tswj hwm cov khoom tseem ceeb xws li kev ua kua, lub zog kho tshuab, tus cwj pwm shrinkage, thiab kev yooj yim tso tawm qauv. Cov ntsiab lus paraffin ntau dua feem ntau ua rau kom muaj kev ua kua ntau dua, ua rau kev tuav cov tshuaj molten rau kev casting ua haujlwm tau zoo dua thiab ua rau cov qauv du thaum lub sijhawm txhaj tshuaj pwm. Txawm li cas los xij, cov tshuaj paraffin ntau dhau tuaj yeem ua rau shrinkage thiab qis zog, muaj kev pheej hmoo ntawm kev cuam tshuam thiab qhov tsis zoo thaum lub sijhawm txias lossis dewaxing. Los ntawm kev ua kom zoo dua cov piv ntawm cov tshuaj paraffin hauv kev casting, cov chaw tsim khoom tuaj yeem ua tiav qhov sib npaug - lub zog txaus rau kev tuav, tswj kev shrinkage rau qhov tseeb ntawm qhov ntev, thiab kev txhim kho qhov chaw tiav. Kev koom ua ke ntawm cov tshuaj microcrystalline lossis polymers nrog cov tshuaj paraffin tuaj yeem txhim kho kev ua haujlwm kho tshuab thiab kev tswj tus nqi shrinkage hauv kev casting. Qhov sib piv meej yuav tsum sib haum nrog cov qauv tshwj xeeb, cuam tshuam txhua yam los ntawm kev tshem tawm qauv mus rau kev tiv thaiv qhov tsis zoo ntawm kev nqis peev casting.
Vim li cas qhov ruaj khov ntawm qhov ntev thiaj li tseem ceeb hauv cov txheej txheem casting peev?
Kev ruaj khov ntawm qhov ntev ntawm cov qauv siv quav ciab yog lub hauv paus rau kev tsim cov khoom kawg uas phim cov qauv tsim. Yog tias cov qauv siv quav ciab deformed lossis shrinked tsis tau kwv yees, cov hlau casting sib xws yuav tau txais cov kev hloov pauv no, ua rau cov khoom uas yuav tsis haum lossis ua haujlwm raws li tau npaj tseg. Rau kev tsim cov qauv siv quav ciab siab, kev tswj hwm qhov ntev ntawm txhua theem yog qhov tseem ceeb kom tsis txhob muaj kev hloov kho tom qab casting kim lossis pov tseg. Cov qauv sib xws yog lub hauv paus ntawm cov txheej txheem casting peev, qhov twg txawm tias qhov tsis ruaj khov me me tuaj yeem txhais tau tias kev ua pwm kim, kev sib dhos tsis ua haujlwm, lossis kev ntseeg siab ntawm cov khoom. Yog li ntawd, qhov ntev ntawm qhov ntev txhawb nqa tag nrho cov txheej txheem ua haujlwm zoo thiab kev tswj hwm cov khoom siv casting peev.
Lub luag haujlwm ntawm stearic acid ua si li cas hauv kev txhaj tshuaj pwm siv quav ciab?
Stearic acid yog muab tso rau hauv cov khoom sib xyaw ua ke ua ib qho kev hloov pauv txheej txheem. Nws cov khoom xyaw ua rau cov yam ntxwv ntawm cov quav ciab yaj thaum lub sijhawm txhaj tshuaj pwm, txo qhov viscosity thiab ua rau quav ciab sau cov qhov pwm kom huv si - txawm tias cov uas muaj cov qauv geometries nyuaj. Dhau li ntawm kev txhim kho liquidity, stearic acid ua haujlwm ua tus neeg sawv cev tso pwm sab hauv, txo qhov kev sib txuas ntawm cov qauv rau cov phab ntsa pwm thiab txo qhov muaj feem ntawm kev rhuav tshem qauv lossis kev sau tsis tiav. Qhov no ua rau muaj kev sib cais huv dua, tsawg dua qhov tsis zoo ntawm qhov chaw, thiab kev tsim kho tshiab txhim khu kev qha - cov txiaj ntsig channeled rau kev txhim kho qhov tiav ntawm qhov chaw hauv castings thiab txo qis cov kev pheej hmoo ntawm cov qauv cuam tshuam nrog casting.
Kev saib xyuas tus nqi shrinkage yuav ua li cas thiaj tiv thaiv tau qhov tsis zoo ntawm casting?
Kev tswj tus nqi shrinkage hauv casting yog qhov tseem ceeb rau kev tiv thaiv kev hloov pauv ntawm qhov ntev, porosity, thiab tawg hauv cov khoom tiav. Kev saib xyuas lub sijhawm tiag tiag ntawm cov qauv quav ciab shrinkage - siv kev ntsuas ncaj qha lossis kev hloov pauv qauv - ua rau cov kws ua haujlwm txheej txheem tuaj yeem kho cov yam ntxwv xws li qhov kub ntawm pwm, qhov ceev ntawm kev txhaj tshuaj, lossis tus nqi txias. Kev saib xyuas ze tso cai rau kev txheeb xyuas cov cheeb tsam uas muaj kev pheej hmoo rau kev contraction ntau dhau, yog li cov xwm txheej tuaj yeem hloov kho ua ntej muaj qhov tsis zoo. Piv txwv hauv cov ntaub ntawv qhia tau hais tias qhov kev tswj hwm adaptive no txo cov qhov tsis zoo me me thiab loj casting, ua rau muaj cov txiaj ntsig zoo dua thawj zaug dhau thiab txo cov khoom seem. Hauv kev nqis peev casting, kev saib xyuas shrinkage tas mus li sib haum xeeb nrog lwm cov txheej txheem tiv thaiv qhov tsis zoo, tshwj xeeb tshaj yog thaum cov qauv yuav tsum khaws cov geometries nyuaj rau cov ntawv thov tseem ceeb.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-15-2025
