Ib qho tshuaj txhuam cov tshuaj txhuam hniav yog ib qho kev xaiv zoo rau PCB prototyping, kho hauv zos, thiab qis - ntim SMD rework thaum ua los yog ua kom tiav cov stencil tag nrho yuav tsis muaj txiaj ntsig. Lub syringe muab rau koj ncaj qha mus rau ib tug neeg ncoo, tab sis nws tsis cia li lav ib tug tswj solder sib koom.
Kev ua haujlwm tiav yog nyob ntawm tsib qhov kev txiav txim siab: xaiv cov khoom siv hluav taws xob- qib muab tshuaj txhuam uas haum rau kev sib dhos, xaiv cov lus qhia uas tuaj yeem hla cov hmoov txhuam kom ntseeg tau, siv cov khoom sib npaug, tso cov khoom sib xyaw yam tsis muaj smearing paste, thiab cua sov sib koom ua ke nyob rau hauv qhov txwv ntawm ob qho tib si muab tshuaj txhuam thiab cov khoom siv.
Teb ceev:Siv cov khoom siv hluav taws xob- qib hluav taws xob solder paste, khaws cov koob txhaj tshuaj ntawm cov khoom lag luam- qhia txog kev ua haujlwm ua ntej qhib, tshem tawm lub taub hau ntawm qhov chaw sim, tso me me thiab rov ua dua tso rau ntawm cov ntaub so huv huv, txo cov khoom siv ntsug, thiab rov ua kom sib koom ua ke nrog kev tswj xyuas cua sov thiab cua. Pib nrog cov lus qhia dav dua thiab qis dua qhov kev ua haujlwm zoo li xav tau. Txav mus rau lub mini-stencil lossis tswj dispenser thaum lub pob suab lossis zais -geometry sib koom ua rau phau ntawv tswj ntim tsis tuaj yeem ntseeg tau.
Rau kev pom dav dav ntawm cov formulations muaj, pib nrog covelectronic solder paste khoom ntau yam.
Dab tsi yog Solder Paste Syringe?
Ib tug solder paste syringe muaj cov hmoov hlau nplaum uas raug tshem tawm hauv lub tsheb flux. Thaum lub sij hawm cua sov, cov flux pab tshem tawm cov oxides saum npoo thiab txhawb kev ntub dej, thaum cov hlau hais coalesce rau hauv ib qho txuas txuas txuas ntxiv. Cov neeg nyeem uas xav tau cov lus qhia dav dav tuaj yeem tshuaj xyuas thawj zaugsolder paste yog dab tsi thiab nws ua haujlwm li cas.
Ib lub syringe ntawm cov tshuaj txhuam hniav tsis zoo ib yam li lub koob txhaj tshuaj ntawm tacky flux. Flux tuaj yeem txhim kho qhov ntws ntawm cov solder uas twb muaj lawm, tab sis nws ib txwm tsis muab cov hlau ntim uas yuav tsum tau tsim kom muaj kev sib koom ua ke tshiab. CovQhov sib txawv ntawm flux paste thiab solder pasteQhov teeb meem thaum twg lub ncoo tau raug ntxuav rov qab mus rau qhov liab qab los yog qhov sib koom ua ke uas twb muaj lawm muaj cov solder me dhau.
Tsis txhob Confuse Jewellery Solder Paste nrog Electronics Solder Paste
Kev tshawb fawb hauv online rau "cov tshuaj nplaum" feem ntau xa rov qab cov lus qhia txog cov hniav nyiaj hniav kub uas siv nyiaj los yog kub cov tshuaj txhuam hniav, lub teeb, quenching, thiab pickling. Cov lus qhia no hais txog cov khoom siv sib txawv thiab yuav tsum tsis txhob raug xa mus rau PCB rework.
Cov khoom siv hluav taws xob siv hluav taws xob yuav tsum raug xaiv raws li PCB tiav, cov hlau uas twb muaj lawm, cov khoom siv ntsuas kub, cov ntaub ntawv ntsuas qhov ntsuas, cov txheej txheem rov qab, cov kev xav tau ntawm cov khoom seem, thiab lub hom phiaj kev ntseeg tau. Cov khoom lag luam npaj rau cov hniav nyiaj hniav kub tsis tuaj yeem haum rau tooj liab PCB pads, plated tivthaiv, lossis hluav taws xob huv yuav tsum tau ua.
Thaum twg yog Solder Paste Syringe Txoj Kev Zoo?
Kev tuav syringe dispensing yog qhov tseem ceeb tshaj plaws thaum kho yog nyob hauv zos thiab ntau lawm ntim tsawg. Cov ntawv thov ib txwm muaj xws li:
- hloov tus kheej nti resistor, capacitor, diode, LED, lossis transistor;
- txhim kho ib qho SOIC lossis lwm tus gull nkag tau -tis pob ntawm tus qauv;
- kho ib lub ncoo uas tsis muaj solder tom qab lub qub qub tau raug tshem tawm;
- assembling ib tug me me ntawm cov boards tsis commissioning ib tug tag nrho stencil;
- ntxiv muab tshuaj txhuam rau cov ntaub qhwv uas tsis tuaj yeem ncav cuag los ntawm cov pa stencil.
Lub syringe ua tsis tshua muaj kev ntseeg siab thaum lub suab qis, ncoo suav nce, lossis cov pob qij txha tau muab zais hauv qab cov khoom. QFN, DFN, LGA, thiab BGA tej pob khoom xav tau kev tswj xyuas qhov ntim thiab tshuaj xyuas kom ze dua. IPC-7093 tshwj xeeb suav nrog kev siv tshuaj pleev xim rau, kev tso kawm, reflow profileing, X-ray tshuaj xyuas, voids, bridging, opens, solder balls, thiab kho rau hauv qab-termination Cheebtsam. Txheeb xyuas IPC-7093 cov ntsiab lus thaum npaj ua haujlwm ntawm cov pob no.
Yuav Ua Li Cas Xaiv Txoj Cai Solder Paste
Sib piv cov alloy uas twb muaj lawm thiab txheej txheem kub
Kev kho tshuaj yuav tsum tau sib xws nrog cov txheej txheem solder uas twb muaj lawm thiab cov txheej txheem npaj kub. Lead-dawb alloys tsis tuaj yeem hloov pauv tau yooj yim vim tias lawv txhua tus tau piav qhia tias yog txhuas{2}}dawb. Lawv cov cwj pwm melting, txhua yam khoom, thiab cov txheej txheem qhov rais tuaj yeem sib txawv. CovPCB solder alloy sib pivmuab qhov pib muaj txiaj ntsig zoo, tab sis thawj qhov kev sib dhos tshwj xeeb yuav tsum tswj qhov kev xaiv zaum kawg.
Yog tias lub rooj sib txoos yog cua sov-sensitive, alead-dawb low-kub solder pastetej zaum yuav txo tau cov thermal raug, tab sis tsuas yog thaum nws cov hlau alloy, kev ntseeg tau ntawm kev sib koom ua ke, qhov chaw tiav, thiab kev pabcuam kub yog qhov tsim nyog rau cov khoom. Tsis txhob xaiv qhov qis melting point tsuas yog ua kom rov ua haujlwm yooj yim dua.
Xaiv qhov Flux System txhob txwm tshaj tawm
Tsis muaj- huv, dej-soluble, rosin-raws li, thiab qis-halogen lossis xoom- halogen formulations muaj qhov sib txawv thiab kev tu kom huv. Ib qho tsis muaj- cov khoom seem huv si tseem yuav xav tau tshem tawm ua ntej txheej txheej, siab -impedance kuaj, tshuaj xyuas qhov muag, lossis siv hauv kev sib kis- ib puag ncig rhiab heev.
Rau kev sib sau ua ke nrog nruj halogen-cov cai tswj hwm, tshuaj xyuas qhov xav tau ntawm asiab -kev cia siab zero-halogen solder muab tshuaj txhuam. Qhov twg cov txheej txheem yuav tsum tau tshaj tawm -reflow ntxuav nrog dej deionized, adej -SMT cov tshuaj txhuam tau ntxuav tautej zaum yuav tsim nyog dua. Kev ntxuav chemistry thiab lub sijhawm yuav tsum ua raws li cov ntaub ntawv cov khoom lag luam es tsis yog cov lus pom zoo ntawm cov kuab tshuaj.
Paub meej tias Cov Tshuaj Txhuam Hniav yog tsim los rau Dispensing
Daim ntawv muab tshuaj txhuam tsuas yog rau kev luam ntawv stencil tuaj yeem txhaws, hlua, cais, lossis tsim cov dots tsis sib xws thaum thawb los ntawm qhov nqaim. Dispensing kev ua tau zoo nyob ntawm cov hmoov loj, hlau thauj khoom, viscosity, thixotropy, qhov kub thiab txias, thiab lub tshuab xa tawm.
Rau phau ntawv los yog automated point deposition, paub meej tias daim ntawv teev cov ntaub ntawv teev cov syringe dispensing, pneumatic dispensing, auger dispensing, los yog jetting raws li ib tug kev txhawb nqa. Adav hlau - luam tawm thiab xa tawm cov tshuaj txhuam hniavyog tsim nyob ib ncig ntawm cov kev xav tau sib txawv los ntawm cov pa stencil - luam ntawv muab tshuaj txhuam.
Yuav Ua Li Cas Xaiv Ib Daim Ntawv Tso Cai
Cov koob me tshaj plaws tsis yog qhov tseeb tshaj plaws. Ib txoj kab uas hla sab hauv tsim kom muaj kev khiav hauj lwm ntau dua, xav tau ntau dua, thiab ua rau muaj kev cuam tshuam los yog tso tawm tam sim ntawd. Qhov tseem ceeb tshaj plaws yog lub taub hau lub taub hau, tsis yog nws cov xim ib leeg, vim qhov ntsuas thiab xim tshuab yuav txawv ntawm tus neeg muag khoom.
Raws li lub hauv paus ntsiab lus pib, xaiv qhov luv tshaj plaws thiab dav tshaj plaws blunt dispensing cov lus qhia uas tseem tuaj yeem tso qhov xav tau teev yam tsis tau kov cov ntaub ntawv uas nyob ib sab. Txo txoj kab uas hla sab hauv tsuas yog thaum qhov tso nyiaj loj dhau rau lub ncoo geometry.
Indium Corporation's solder paste cia thiab tuav cov lus qhia muab cov piv txwv hauv qab no kev sib raug zoo ntawm EFD koob qhov ntau thiab tsawg thiab cov hom hmoov loj tshaj plaws. Qhov no yog tus neeg siv khoom siv, tsis yog qhov tshwj xeeb universal; txheeb xyuas compatibility nrog cov ntaub ntawv muab tshuaj tiag tiag.
| Koob ntsuas | Piv txwv Internal Diameter | Piv txwv Loj Tshaj Plaws Hom | Tswv yim txhais |
|---|---|---|---|
| 20 | 0.023 nyob rau hauv / 580 µm | Hom 3 | Tsawg khiav tsis kam; pab tau thaum ncoo geometry tso cai rau qhov tso nyiaj ntau dua. |
| 22 | 0.016 in / 410 µm | Hom 3 | Ib qho kev tswj xyuas ntau dua, tab sis siab thiab clogging rhiab heev nce. |
| 25 | 0.010 hli / 250 µm | Hom 4 | Finer deposits xav tau ib qho kev nplua zoo - hmoov dispensing formulation. |
| 27 | 0.008 in / 200 µm | Hom 5 | Siv tsuas yog thaum txoj kev muab tshuaj txhuam thiab xa tawm yog tsim los rau qhov kev txwv no. |
| 30 | 0.006 in / 150 µm | Hom 6 | Zoo heev dispensing nrog lub qhov rais nqaim txheej txheem thiab siab dua clogging rhiab heev. |
Tsis txhob theej lub rooj rau hauv cov lus qhia ua haujlwm yam tsis tau kuaj xyuas cov chaw tsim khoom muab tshuaj txwv. Alloy muaj pes tsawg leeg, particle tis, hlau loading, cia keeb kwm, siab, thiab koob ntev tuaj yeem hloov pauv tus cwj pwm dispensing.
Cov cuab yeej thiab cov ntaub ntawv los npaj ua ntej rov ua haujlwm
- lub solder paste TDS thiab SDS;
- lub rooj tsavxwm lossis cov khoom sib dhos specification;
- ib tug blunt dispensing tip tau tshaj lub paste;
- magnification thiab haum tweezers;
- solder wick thiab ib qho kev pom zoo tu txoj kev thaum qub solder yuav tsum tau muab tshem tawm;
- tswj kub- chaw nres tsheb huab cua, phaj kub, qhov cub me me, lossis qhov ntsuas cua sov hauv zos;
- ESD tswj tsim nyog rau lub cuab yeej;
- ib tug seem board los yog pov tseg xeem nto rau purging thiab sim deposits.
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Yuav Ua Li Cas Siv Cov Tshuaj Txhuam Txhuam Txhuam Txhuam
Kauj Ruam 1: Txheeb xyuas cov khoom siv thiab kev sib dhos
Paub meej tias cov alloy, flux faib, txee lub neej, cia keeb kwm, hom hmoov, tivthaiv orientation, PCB ncoo mob, thiab xaiv cov cua sov txoj kev. Yog hais tias tus thawj alloy tsis paub, txheeb xyuas qhov sib dhos specification ua ntej ntxiv cov hlau sib txawv rau qhov sib koom ua ke.
Kauj Ruam 2: Nqa cov koob txhaj tshuaj rau nws qhov kev ua haujlwm tshwj xeeb
Khaws lub tub yees muab tshuaj txhuam kaw thaum nws sib npaug rau ib puag ncig uas tus neeg muag khoom tau teev tseg. Qhib lub syringe txias hauv chav sov tuaj yeem ua rau muaj kuab paug. Tsis txhob siv rab phom kub, microwave, lossis phaj kub los ua kom sov- nce.
Cov khoom siv -cov lus qhia tshwj xeeb tswj qhov ntsuas qhov kub thiab txias, lub sijhawm sib npaug, lub neej ua haujlwm, thiab seb lub syringe qhib yuav rov qab mus rau tub yees. Txhawm rau tuav cov ntsiab lus ntxiv, tshuaj xyuas lub vev xaib cov lus qhia rausolder paste txee lub neej thiab cia. Indium cov kev taw qhia dav dav kuj pom zoo kom khaws cov koob txhaj tshuaj thiab cov cartridges nrog cov lus taw qhia rau kev xa cov kev ua tau zoo thiab tso cai rau muab tshuaj txhuam kom sib npaug ua ntej qhib.
Kauj Ruam 3: Npaj cov pav ca, huv si
Tshem tawm cov khoom ua tsis tau zoo thiab tshuaj xyuas cov qauv hauv av hauv qhov kev nthuav dav. Wick tshem cov qub qub qub thaum xav tau, ntxuav cov khoom seem uas tsis muaj paug nrog cov txheej txheem pom zoo, thiab tshawb xyuas cov ntaub qhwv nqa, solder- daim npog qhov ncauj puas, lossis txuas txuas ntxiv.
Cov khoom siv hloov pauv yuav tsum zaum sib npaug ntawm cov ntaub qhwv ua ntej rov ua dua. Kev muab tshuaj txhuam tshiab tsis tuaj yeem kho qhov av puas, oxidation hnyav, lossis tsis zoo rau cov neeg kho tshuab.
Kauj ruam 4: Txuas thiab tshem tawm cov lus qhia
Txhim kho lub hau kom ruaj ntseg thiab tuav lub koob txhaj tshuaj rau ntawm qhov chaw pov tseg. Siv lub zog ruaj khov kom txog thaum lub paste tsim ib qho chaw rov ua dua. Thawj qhov tso nyiaj yuav muaj cov cua nkag los yog cov khoom uas tau nthuav tawm ntawm qhov kawg.
Ib qho nyiaj ruaj khov yuav tsum tau tshem tawm kom huv si thaum lub siab tso tawm thiab lub taub hau raug tshem tawm. Yog tias qhov muab tshuaj txuas ntxiv mus rau txoj hlua, surges tom qab ncua sijhawm, lossis xav tau kev quab yuam ntau dhau, nres thiab xyuas qhov kub, qhov loj me, txhaws, thiab muab tshuaj txhuam kom haum ua ntej kov PCB.
Kauj Ruam 5: Xa cov nyiaj tshuav nyiaj li cas
Tuav lub hau ze rau ntawm lub ncoo yam tsis tau khawb lub npog ntsej muag lossis tooj liab tiav. Siv qhov tso nyiaj, tso siab, thiab nqa vertically. Siv cov khoom sib cais ntawm cov ntaub qhwv nyias tshwj tsis yog tias cov txheej txheem pob tau txhob txwm tsim ib ncig ntawm cov hlaws lossis cov qauv tso nyiaj.
Qhov nyiaj tshuav tseem ceeb npaum li qhov ntim tag nrho. Kev tso nyiaj tsis sib xws ntawm qhov sib txawv ntawm cov khoom me me tuaj yeem tsim cov dej tsis sib xws thiab ua rau muaj kev pheej hmoo tombstoning. Ntawm qhov zoo -pitch gull- tis coj, ntau ntau muab tshuaj txhuam ntawm cov ntaub so ntswg tsim txoj hauv kev ncaj qha mus rau kev sib txuas.
Kauj Ruam 6: Muab cov khoom xyaw yam tsis muaj smearing lub paste
Txo cov tivthaiv vertically nrog tweezers lossis ib lub cuab yeej tso. Zawv zawg qhov hla ntawm cov ntaub qhwv tuaj yeem thawb muab tshuaj txhuam rau hauv cov khoom siv - qhov ncauj qhov ntswg. Siv tsuas yog txaus siab rau lub rooj txiav tawm hauv qhov muab tshuaj txhuam, tom qab ntawd paub meej tias kev sib tw, kev taw qhia, thiab polarity.
Kauj Ruam 7: Reflow nrog Tswj Kub
Lub solder paste TDS yuav tsum txhais lub qhov rais profile pom zoo. Nyeem nws li plaub theem txuas:
- Ramp los yog preheat:lub rooj tsavxwm thiab cov khoom ua kom sov maj mam, txo cov thermal shock thiab cia cov khoom tsis haum rau kev khiav tawm hauv kev tswj hwm.
- Soak los yog qhib:Qhov kub thiab txias ua kom zoo sib xws thiab cov flux ua haujlwm.
- Lub sij hawm tshaj li kua thiab ncov:cov alloy melts, hais coalesce, thiab solder wets lub ncoo thiab terminations.
- Cua txias:qhov sib koom ua ke solidifies yam tsis muaj kev txav los yog siab thermal shock.
Nrog cua kub, pib nrog cov cua qis tshaj plaws uas ua kom sov lub hom phiaj zoo. Yog hais tias ib qho me me txav ua ntej lub paste coalesces, airflow siab dhau los yog lub nozzle ze dhau. Thaum muaj kev vam meej reflow, lub grainy muab tshuaj txhuam hloov mus rau hauv ib tug nruam solder nto thiab cov khoom yuav khom me ntsis raws li wetting rog sib npaug.
Paste profile tsuas yog ib qho txwv xwb. Cov pob khoom siv kuj tseem tuaj yeem muaj cov dej noo thiab qhov siab tshaj -kev txwv kub. IPC/JEDEC J-STD-020E hais txog kev faib cov dej noo/reflow rhiab heev rau qhov chaw uas tsis muaj dej tsis zoo-mount cov khoom siv thiab suav nrog kev rov ua haujlwm hauv nws qhov peev txheej. Tshawb xyuas daim ntawv lo thiab cov ntaub ntawv tsim khoom ua ntej siv lub cev tag nrho.
Kauj Ruam 8: Txias, tshuaj xyuas, thiab ntxuav
Cia lub rooj sib dhos kom txias yam tsis tau txav cov khoom. Raws li kev nthuav dav, tshawb xyuas qhov sib txawv, pom kev ntub dej, qhib cov pob qij txha, txuas hniav, cov pob qij txha, cov khoom nyob ze, qhov chaw puas tsuaj, thiab cov khoom seem.
Rau kev siv tau, kev tshuaj xyuas qhov muag tuaj yeem txheeb xyuas ntau yam teeb meem pom tseeb. Cov pob qij txha zais hauv QFN, DFN, LGA, lossis BGA tej pob khoom yuav xav tau X-ray lossis lwm txoj kev tshuaj xyuas tsim nyog. Lub site lub ntsiab lus ntawmsolder paste soj ntsuam thiab PCB zoomuab cov ntsiab lus ntxiv, thaum IPC-7093 txheeb xyuas X-ray thiab lwm txoj hauv kev tshuaj xyuas rau cov khoom siv hauv qab.
Koj yuav tsum thov npaum li cas Solder Paste?
Tsis muaj universal dot inch uas ua haujlwm rau txhua yam. Qhov yuav tsum tau ntim yog nyob ntawm thaj chaw ncoo, uas twb muaj lawm solder, lead geometry, muab tshuaj txhuam hlau thauj khoom, alloy, nto tiav, thiab qhov kawg yuav tsum tau ua.
Siv cov hauv qab no los ua ib daim ntawv qhia kev txiav txim es tsis yog daim ntawv qhia lej:
| Component los yog Joint | Deposit Strategy | Saib dab tsi |
|---|---|---|
| Chip resistor los yog capacitor | Muab ib qho me me, zoo ib yam tso rau ntawm txhua lub ncoo. | Qhov ntim tsis sib xws tuaj yeem ua rau tombstoneing; muab tshuaj txhuam sab nraum lub ncoo tuaj yeem tsim cov pob. |
| SOIC los yog dav dua -pitch gull-wing leads | Siv ib tug me me deposits los yog ib tug nqaim validated hlaws dai. | Muab tshuaj txhuam ntawm cov ntaub qhwv ua rau muaj kev pheej hmoo txuas ntxiv. |
| Zoo-pitch TSSOP lossis QFP | Nyiam dua kev xa rov qab lossis ib qho me me -stencil. | Kev hloov pauv ntawm cov dot ntawm phau ntawv tuaj yeem tshaj qhov muaj nyob hauv cov khoom siv - npog qhov sib nrug. |
| QFN thermal ncoo | Siv tus qauv tswj kev faib tawm es tsis yog ib lub mound. | Cov ntim ntau dhau tuaj yeem nqa lossis qaij lub pob thiab ua rau voiding. |
| BGA los yog LGA | Tsis txhob tswj tsis tau daim ntawv thov pub dawb. | Cov pob qij txha zais yuav tsum tau tswj lub ntim, sib dhos, thiab tshuaj xyuas kom haum. |
| Loj lub davhlau ya nyob twg los yog connector ncoo | Siv cov tshuaj nplaum txaus kom ntub ob qhov chaw yam tsis tau npog cov qhov ncauj qhov ntswg nyob ze. | Cov khoom siv ntau dhau tuaj yeem wick, txuas, lossis tiv thaiv cov khoom los ntawm kev zaum. |
Kev sib koom ua tiav yuav tsum tsis txhob txiav txim los ntawm qhov loj lossis ci. Kev ntub dej, kev sib dhos, hluav taws xob txuas ntxiv, kev sib koom ua ke geometry, qhov seem seem, thiab cov txheej txheem kev lees paub tseem ceeb dua. Rau cov ntaub ntawv- qib kuaj xyuas, saib lub vev xaib cov ntsiab lus ntawmsolder paste ntsuam xyuas kev ua tau zoo.
Ob qho piv txwv Rework
Piv txwv 1: Hloov lub 0603 Resistor
Qhov piv txwv no yog kev npaj ua haujlwm, tsis yog kev teeb tsa thoob ntiaj teb.
- Paub meej tias tus nqi hloov pauv, pob loj, qhov xav tau kev taw qhia, alloy, thiab qhov ntsuas kub ntawm qhov txwv.
- Tshem tawm qhov qub thiab theem ob lub ncoo kom lub resistor tuaj yeem zaum ncaj.
- Ntxuav lub syringe kom txog thaum nws tsim cov dots rov ua dua.
- Muab ib qho me me tso rau ntawm qhov chaw ntawm txhua lub ncoo thiab sib piv ob qhov tso nyiaj hauv qhov kev nthuav dav.
- Txo cov resistor vertically thiab xyuas tias ob qho tib si terminations hu rau paste yam tsis tau nyem nws dhau ntawm cov npoo npoo.
- Thaum tshav kub kub ob qhov kawg sib npaug. Yog hais tias ib qho kawg liquefies ntau ua ntej, xyuas cov nyiaj tshuav nyiaj li cas thiab thermal asymmetry.
- Tom qab txias, tshuaj xyuas kev sib dhos, ua kom tiav ntub dej, cov khoom siv, thiab qhov kawg nqa.
Piv txwv 2: Reworking SOIC Package
- Ntxuav thiab ua kom cov kab ntawm cov ntaub qhwv; ib lub ncoo tsa tuaj yeem tiv thaiv ob peb txoj hauv kev los tiv thaiv kom raug.
- Siv ib tus neeg tso nyiaj rau qhov dav dua -pitch leads, los yog ib lub hlaws nqaim tsuas yog tom qab lees paub tias qhov ntim yuav tsis dej nyab qhov khoob.
- Teem lub kaum sab xis ua ntej, tom qab ntawd xyuas tag nrho cov kev taw qhia pob ua ntej cua sov.
- Siv cov airflow tsawg thiab faib cov cua sov thoob plaws lub pob es tsis yog tsom rau ntawm ib qho txhuas.
- Tom qab rov ua dua, tshuaj xyuas txhua qhov pom cov hlau lead rau cov txuas hniav, qhib, thiab tawm -pad alignment.
- Yog hais tias lub suab tsis zoo heev rau kev rov ua dua phau ntawv tso nyiaj, nres thiab siv mini -stencil lossis lwm txoj kev tswj hwm.
Cov teeb meem tshwm sim: Lub Rooj Diagnostic Faster
| Teeb meem | Tej yam yuav tshwm sim | Thawj qhov kuaj xyuas | Kev taw qhia kho |
|---|---|---|---|
| Koob clogs | Lub tswv yim yog nqaim dhau, muab tshuaj txhuam tau qhuav ntawm qhov hluav taws xob, hom hmoov tsis haum, lossis cov tshuaj muab tshuaj tsis yog tsim los rau kev xa tawm. | Tshawb xyuas sab hauv txoj kab uas hla, muab tshuaj txhuam qhov kub thiab txias, qhov tshwm sim ntawm qhov taw qhia, thiab TDS. | Hloov cov lus taw qhia, txav mus rau qhov dav sab hauv txoj kab uas hla, lossis xaiv cov khoom faib tawm - qib muab tshuaj. Tsis txhob yuam kev thaiv nrog kev kub siab. |
| Muab cov hlua khi ntawm cov ntaub qhwv | Lub siab tsis tso tawm ua ntej nqa, lub taub hau yog rub, lossis muab tshuaj txhuam rheology tsis tsim nyog. | Saib xyuas qhov tso nyiaj rau ntawm qhov chaw sim thiab sib piv kev nqa ceev thiab qhov siab qhov siab. | Tso lub siab ua ntej, nqa vertically, luv lub ntsis yog tias tsim nyog, los yog hloov paste/tip ua ke. |
| Solder choj | Tshaj ntim, tawm -qhov tso nyiaj nruab nrab, smeared paste, misalignment, lossis cua sov tsis sib xws. | Tshawb xyuas ua ntej -reflow deposit txoj hauj lwm thiab post- qhov chaw sib kis. | Txo thiab rebalance deposits; txhim kho kev tso kawm thiab kev faib hluav taws xob. |
| Solder pob nyob ib ncig ntawm ib feem | Muab tshuaj txhuam rau sab nraud ciam teb, cua kub ceev, kis kab mob, ya raws, los yog degraded paste. | Tshawb xyuas qhov chaw muab tshuaj txhuam thiab tshuaj xyuas qhov chaw cia thiab sov- keeb kwm. | Khaws cov khoom tso rau ntawm -pad, kho cov txheej txheem thermal, thiab hloov cov khoom uas muaj lus nug. |
| Tsis txaus solder lossis qhib sib koom ua ke | Muab tshuaj me me dhau, hloov pauv tsis zoo, lub ncoo puas, kev sib cuag tsis tiav, lossis cua sov tsis txaus. | Txheeb xyuas qhov qub tso nyiaj, ncoo mob, qhov chaw zaum, thiab ntub dej. | Kho cov hauv paus hauv paus ua ntej yuav muab tshuaj txhuam ntxiv lossis rov ua cov cua sov. |
| Kev ntub dej tsis zoo | Oxidized los yog kab mob ntog, tsis raug flux system, degraded paste, incompatible finish, los yog tsis raug profile. | Tshawb xyuas qhov xwm txheej ntawm qhov chaw thiab txheeb xyuas cov alloy, flux, thiab qhov kub thiab txias. | Ntxuav lossis kho qhov chaw, siv cov khoom siv sib xws, thiab siv tau cov txheej txheem cua sov ntawm tus qauv tsis yog - tseem ceeb. |
Syringe, Stencil, Flux nkaus xwb, lossis Preform?
| Txoj kev | Kev siv zoo tshaj plaws | Main Advantage | Lub ntsiab txwv |
|---|---|---|---|
| Solder paste syringe | Kev kho hauv cheeb tsam, qauv qauv, kev hloov SMD tus kheej | Flexible thiab tsis tshua muaj nqi teeb tsa | Volume nyob ntawm tus neeg teb xov tooj, cov lus qhia, thiab tus cwj pwm muab tshuaj |
| Mini-stencil lossis stencil puv | Rov qab layouts, zoo -pitch pads, ntau yam | Ntau dua tso nyiaj geometry | Yuav tsum muaj kev sib raug zoo thiab tsim kom haum aperture |
| Flux nkaus xwb | Ib qho kev sib koom ua ke uas twb muaj cov solder txaus | Txhim kho ntub dej tsis txhob txhob txwm ntxiv hlau | Tsis tuaj yeem hloov cov ntim uas ploj lawm |
| Solder preform | Cov pob qij txha tshwj xeeb yuav tsum tau tswj cov hlau ntim | Txhais solder kom muaj nuj nqis | Yuav tsum muaj qhov tseeb alloy, qhov ntev, thiab kev tso kawm |
Rau kev rov ua dua lub rooj sib txoos los yog nplua -pitch ntau lawm, tshuaj xyuas lub vev xaib cov lus qhia raustencil-raws li solder paste daim ntawv thov. Lub koob txhaj tshuaj yog qhov yooj yim rau kev kho, tab sis kev yooj yim yuav tsum tsis txhob hloov cov nyiaj rov qab.
Yuav Ua Li Cas Khaws Cov Tshuaj Txhuam Txhuam Hniav
- Ua raws li cov khoom lag luam - qhov tshwj xeeb cia kub thiab txee- cov lus qhia txog lub neej.
- Khaws lub syringe kaw kom txog thaum nws tau mus txog qhov ua haujlwm tau teev tseg.
- Khaws cov koob txhaj tshuaj nyob rau hauv qhov kev taw qhia pom zoo los ntawm tus neeg muag khoom; qee tus neeg muag khoom hais qhia cov lus qhia - cia cia.
- Kev tshem tawm daim ntawv lo thiab lub sijhawm qhib kom sib sau ua ke tuaj yeem taug qab.
- Siv thawj-hauv, ua ntej- tawm ntawm kev tswj cov khoom muag.
- Hloov cov lus qhia uas muaj kab mob los yog ib nrab qhuav es tsis txhob thawb cov khoom qhuav rau hauv paste.
- Tsis txhob muab tshuaj txhuam siv nrog cov khoom tshiab.
- Tsis txhob rov tso tub yees ib lub koob txhaj tshuaj qhib tshwj tsis yog TDS thiab cov txheej txheem siv tau tso cai.
Xaus
Ib lub syringe muab tshuaj txhuam yog qhov zoo tshaj plaws thaum nws raug kho raws li cov cuab yeej tswj kev tso tawm es tsis yog lub thawv yooj yim ntawm cov tshuaj txhuam. Sib piv cov hlau thiab flux rau lub rooj sib txoos, xaiv lub koob los ntawm txoj kab uas hla thiab cov hmoov sib xyaw ua ke, tshem tawm ua ntej dispensing, sib npaug ntawm cov deposits, thiab siv txoj kev cua sov uas ua kom sov rau qhov sib npaug.
Rau qhov zoo - suab lossis zais - pob khoom sib koom ua ke, txav mus rau ib qho mini-stencil, tswj dispenser, lossis lwm txoj kev siv tau ua ntej phau ntawv hloov pauv yuav yog qhov tseem ceeb ntawm qhov tsis xws luag.
Thaum thov kev pom zoo ntawm cov tshuaj txhuam hniav, muab cov hlau nplaum, hmoov hom, cov khoom siv pob thiab cov suab, cov ntaub qhwv ntsej muag, xav tau rab koob sab hauv txoj kab uas hla, kev faib tawm, kev tu kom huv, kev cia khoom, thiab cov khoom siv rov qab. Koj tuaj yeem tiv tauj peb nrog cov ntsiab lus no kom xaiv cov khoom raws li cov txheej txheem tiag tiag es tsis yog tsuas yog lub npe alloy lossis tus nqi.
FAQ
Q: Puas tuaj yeem siv cov tshuaj txhuam hniav hauv ib lub syringe?
A: Tsis yog. Ib qho stencil- luam ntawv muab tshuaj txhuam yuav tsis muab xa mus zoo los ntawm qhov nqaim. Paub meej txog cov kev txhawb nqa daim ntawv thov, hom hmoov, hlau thauj khoom, thiab viscosity nyob rau hauv cov ntaub ntawv cov khoom.
Q: Puas yog ib rab koob zoo ib txwm muaj tseeb dua?
A: Tsis yog. Ib lub tswv yim zoo tuaj yeem tsim kom muaj qhov tso nyiaj me me, tab sis nws kuj ua rau muaj kev ua haujlwm tsis txaus, txhaws qhov rhiab heev, thiab kev hloov siab. Qhov tseeb yog los ntawm kev sib piv cov lus qhia, muab tshuaj txhuam, pad geometry, thiab txoj kev xa tawm.
Q: Can solder paste reflowed nrog ib tug soldering hlau?
A: Nws tuaj yeem ua tau rau qee qhov kev sib koom ua ke hauv zos, tab sis cov hlau tsis tuaj yeem ua kom sov ntau - cov pob txhuas sib npaug raws li kev tswj kub - cua lossis rov ua dua. Xaiv cov txheej txheem cua sov raws li lub pob geometry thiab cov khoom nyob ze.
Q: Yuav tsum tsis muaj- cov khoom seem huv si ib txwm nyob hauv lub rooj tsavxwm?
A: Tsis yog. "Tsis yog-huv" piav qhia txog kev tsim thiab kev cia siab rau residue nyob rau hauv cov xwm txheej tshwj xeeb; nws tsis txhais hais tias kev ntxuav yeej tsis tsim nyog. Cov txheej txheem sib xws, siab -impedance circuitry, cov kev xav tau ntawm cov tshuaj pleev ib ce, thiab ib puag ncig hnyav tuaj yeem ua pov thawj rau cov txheej txheem tu kom raug.
Q: Thaum twg kuv yuav tsum tsis txhob siv lub syringe thiab siv mini -stencil?
A: Hloov thaum uas nyob ib sab tso tsis tuaj yeem rov ua dua, thaum lub suab zoo dhau los tiv thaiv kev nkag mus rau qhov tsis sib xws, thaum lub pob muaj qhov loj zais thermal ncoo, lossis thaum ntau lub rooj sib txig sib luag yuav tsum muaj qhov ntim zoo ib yam.
Kawg Ua Ntej-Rework Checklist
- Cov khoom siv yog cov khoom siv hluav taws xob- qib muab tshuaj txhuam.
- Lub alloy thiab flux system phim cov kev cai sib dhos.
- Cov hmoov hom thiab rab koob sab hauv txoj kab uas hla yog sib xws.
- Lub syringe kaw tau mus txog qhov kev ua haujlwm tau teev tseg.
- Cov ntaub qhwv yog huv, tiaj tus, thiab tsis muaj kev puas tsuaj.
- Thawj qhov kev xeem tso nyiaj yog ruaj khov thiab rov ua dua.
- Cov txheej txheem cua sov nyob twj ywm nyob rau hauv paste thiab feem txwv.
- Cov pob qij txha ua tiav tuaj yeem raug tshuaj xyuas nrog txoj kev tsim nyog.
