Ib daim ntawv qhia txog kev muab tshuaj txhuam cov ntaub ntawv tuaj yeem tshwm sim ua tiav thaum tseem tawm hauv cov txheej txheem tseem ceeb cov lus nug tsis teb. Ib daim ntawv tuaj yeem hais txog qhov loj ntawm cov hlau thiab hmoov, thaum lwm qhov tsom mus rau viscosity, luam ntawv ceev thiab kev taw qhia rov qab. Qee qhov txiaj ntsig piav qhia cov txiaj ntsig ntawm kev kuaj pom zoo; lwm tus yog lub hom phiaj, txwv lossis kev pom zoo ua haujlwm.
Kev sib piv cov khoom los ntawm ib tus lej xov tooj tuaj yeem ua rau muaj kev txiav txim siab tsis ncaj ncees lawm.
Ib qho zoo siv tshuaj txhuam TDS yuav tsum pab engineers, buyers thiab pab pawg zoo teb plaub nqe lus nug:
- Puas yog cov khoom siv sib xws nrog cov alloy, cov khoom thiab PCB tiav?
- Nws puas tuaj yeem tso siab tau nrog cov cuab yeej npaj?
- Nws puas yuav nyob ruaj khov los ntawm kev luam ntawv, tso thiab rov ua dua?
- Cov lus thov twg tseem xav tau kev lees paub ntawm lub rooj sib txoos tiag tiag?
Phau ntawv qhia no piav qhia txog kaum ob pab pawg tshwj xeeb thiab qhia tias yuav ua li cas tig ib daim ntawv teev cov ntaub ntawv mus rau hauv qhov kev ntsuam xyuas SMT.
Teb ceev: Dab tsi yuav tsum tau muab tshuaj txhuam TDS qhia rau koj?
Yam tsawg kawg nkaus, daim ntawv txheeb muab tshuaj txhuam yuav tsum txheeb xyuas lossis txhawb kev ntsuam xyuas ntawm:
- alloy muaj pes tsawg leeg;
- solidus, liquidus los yog melting ntau yam;
- hmoov hom thiab particle-loj faib;
- cov ntsiab lus hlau;
- Kev faib tawm flux;
- viscosity thiab nws cov kev xeem;
- poob qis los yog tus cwj pwm thixotropic;
- tack force thiab tack life;
- stencil lub neej lossis lub neej ua haujlwm;
- cia kub thiab txee lub neej;
- pom zoo rau daim ntawv thov;
- reflow, residue thiab ntxuav kev taw qhia.
Electronics -qib solder pasteyog ib qho khoom siv sib xyaw ua ke, tsis yog hmoov txhuas. Cov ntaub ntawv cov khoom txhawb nqa kev tshuaj xyuas thiab kev npaj cov txheej txheem, tab sis nws tsis hloov qhov kev tswj xyuas ntau lawm.
Tus nomIPC J-STD-005B solder paste txheemhais txog kev tsim nyog thiab cov yam ntxwv uas yuav tsum tau ua rau solder paste. Siv cov txheej txheem yuav khoom, cov ntaub ntawv khoom tam sim no thiab cov neeg siv khoom xav tau rau kev pom zoo.
TDS vs SDS vs CoA
Cov ntaub ntawv no teb cov lus nug sib txawv thiab yuav tsum tsis txhob muab hloov pauv rau ib leeg.
| Cov ntaub ntawv | Lub Hom Phiaj | Cov ntsiab lus |
|---|---|---|
| TDS | Kev xaiv cov khoom thiab kev coj ua | Tej yam khoom, specification ranges qhov twg muab, thiab pom zoo cia, luam ntawv thiab reflow tej yam kev mob |
| SDS | Kev noj qab haus huv thiab kev nyab xeeb | Kev phom sij, kev tiv thaiv, kev tuav, kev thauj mus los thiab cov ntaub ntawv xwm txheej ceev |
| CoA | Ntau-cov pov thawj tshwj xeeb | Cov txiaj ntsig kev xeem lossis cov lus qhia ua raws rau cov khoom tsim tawm, raws li tus neeg muag khoom thiab kev pom zoo yuav khoom |
TDS feem ntau qhia txog qhov tseem ceeb thiab cov txheej txheem pom zoo, txawm hais tias qee cov ntaub ntawv kuj muaj cov kev txwv tshwj xeeb. CoA tuaj yeem muab cov ntaub ntawv pov thawj qib - qib, tab sis nws cov ntsiab lus nyob ntawm tus neeg xa khoom, kev yuav khoom tshwj xeeb thiab kev pom zoo zoo.
Rau cov neeg nyeem uas xav tau cov ntaub ntawv tseem ceeb ua ntej, tsab xov xwm ntawmyuav ua li cas solder paste ua haujlwmpiav qhia txog kev sib raug zoo ntawm cov hmoov hlau alloy, flux thiab cua sov.
Tej yam muaj nuj nqis, Cov Hom Phiaj thiab cov kev txwv tshwj xeeb
Ua ntej muab piv rau ob qhov kev qhia tshwj xeeb ntawm cov tshuaj txhuam hniav, txheeb xyuas seb txhua tus lej sawv cev li cas.
| Lub sij hawm | Feem ntau txhais tau li cas | Yuav Siv Li Cas |
|---|---|---|
| Yam nqi | Ib tug neeg sawv cev tshwm sim, tsis tas yuav tsum tau lav batch txwv | Siv rau kev sib piv thawj zaug thiab kev npaj txheej txheem |
| Nominal nqi | Ib qho kev siv tau hais los yog qhov xav tau nruab nrab tus nqi | Xyuas seb puas muaj kev kam rau siab |
| Hom phiaj | Cov txheej txheem xav tau los yog qhov chaw ua haujlwm | Siv tau ntawm cov khoom siv tiag tiag thiab kev sib dhos |
| Specification txwv | Qhov tsawg kawg nkaus, qhov siab tshaj plaws lossis ntau yam siv rau kev lees paub | Paub meej txog txoj kev xeem thiab seb qhov kev txwv yog kev cog lus |
| Guaranteed tus nqi | Tus nqi uas tus neeg muag khoom tau cog lus rau raws li kev cai | Txheeb xyuas seb cov ntaub ntawv ua raws li cas thiab seb nws puas tshwm sim hauv CoA |
Yog tias TDS tsis paub qhov txawv ntawm cov pawg no, thov kom meej meej ua ntej siv tus nqi hauv cov phiaj xwm tshuaj xyuas los yog kev yuav khoom tshwj xeeb.
1. Alloy Composition
Lub alloy yog thawj solder paste specification los xyuas. A TDS yuav tsum txheeb xyuas qhov tseeb muaj pes tsawg leeg, xws li SAC305, Sn63/Pb37, Sn42/Bi58, qis-silver SnAgCu alloy lossis lwm cov qauv tsim.
Lub sij hawmlead-dawbtsis txaus tshwj xeeb. Cov hlau lead sib txawv- cov alloys dawb tuaj yeem muaj cov cwj pwm sib txawv, cov khoom siv kho tshuab, tus nqi thiab kev sib raug zoo nrog cov solder uas twb muaj lawm.
Alloy xaiv cuam tshuam:
- txheej txheem kub;
- tus cwj pwm ntub dej;
- thermal qaug zog ua haujlwm;
- compatibility nrog lub rooj sib txoos uas twb muaj lawm;
- tiv thaiv kub raug;
- kev tswj hwm thiab cov neeg siv khoom xav tau.
Thaum hloov cov khoom siv, txiav txim siab seb qhov kev sib dhos tau pom zoo tso cai rau kev hloov pauv ntawm cov hlau. Cov lus qhia rautin solder alloys rau PCB los ua kemuab alloy ntxiv - xaiv cov ntsiab lus.
2. Solidus, Liquidus thiab Melting Range
A TDS tuaj yeem sau ib qho chaw melting, cais cov solidus thiab liquidus kub, los yog ib qho melting ntau.
Ib qho eutectic alloy hloov los ntawm cov khoom mus rau cov kua ntawm ib qho kev ntsuas kub. Ib qho uas tsis yog -eutectic alloy kis tau los ntawm ntau yam hauv cov khoom thiab cov theem ua kua ua ke.
Qhov kev sib txawv no tseem ceeb hauv cov cua sov- cov khoom sib dhos, cov khoom sib txuas ua ke, qis- ua haujlwm kub thiab cov khoom uas twb muaj qis dua - melting alloy.
Melting kub tsis zoo ib yam li qhov yuav tsum tau qhov cub ncov. Cov hlau nplaum ntawm cov pob qij txha yuav tsum nyob twj ywm saum cov kua dej rau cov txheej txheem - lub sijhawm tshwj xeeb ntev txaus los txhawb kev ntub dej, tsis tas yuav nthuav tawm lub rooj tsavxwm thiab cov khoom kom tsis muaj cua sov.
Ib qho rov qab nkhaus hauv TDS yog lub qhov rais pib. Ntsuas qhov profile kawg ntawm lub rooj sib txoos PCB tiag. Rau cov ntawv thov uas txwv tsis pub thermal raug, tshuaj xyuas seb alead-dawb low-kub solder pastephim cov khoom siv tag nrho thiab kev ntseeg tau.
3. Hom hmoov thiab Particle Distribution
Hom hmoov piav qhia txog kev tswj cov khoom siv - qhov loj me. Cov khoom siv SMT feem ntau yuav siv hom 3, Hom 4, Hom 5 lossis hmoov zoo.
Daim ntawv teev cov ntaub ntawv yuav tsum ua kom pom tseeb tias:
- Hom hmoov;
- nominal particle ntau;
- Upper particle-loj txwv;
- particle zoo los yog cov ntaub ntawv sphericity;
- kev faib lossis kev xeem.
Tsis txhob xaiv qhov muab tshuaj txhuam los ntawm Hom naj npawb ib leeg. Kev luam ntawv tseem nyob ntawm lub tsheb flux, cov ntsiab lus hlau, stencil geometry thiab lub tshuab luam ntawv.
Rau cov ntawv thov stencil, sib piv cov khoom sab sauv - qhov loj me me nrog qhov tsawg tshaj plaws aperture, tom qab ntawd txheeb xyuas qhov sib piv ntawm thaj chaw thiab kev hloov pauv kev ua haujlwm. Tshooj lus ntawmsolder muab tshuaj txhuam lub cevpiav qhia vim li cas qhov loj me me tsuas yog ib feem ntawm cov khoom coj cwj pwm.
4. Cov ntsiab lus hlau
Solder paste muaj cov hmoov hlau thiab cov flux - muaj tsheb. Cov ntsiab lus hlau feem ntau qhia raws li qhov feem pua ntawm qhov hnyav.
Nws tuaj yeem cuam tshuam cov ntim ntim ntim, rheology, slump, luam ntawv teb, seem seem thiab faib tus cwj pwm. Qhov feem pua siab dua tsis tau zoo dua.
Thaum sib piv cov khoom, xyuas kom meej tias qhov tseem ceeb siv tib lub hauv paus thiab kev sim. Qhov sib txawv me me ntawm tus lej yuav tsis muaj txiaj ntsig thaum cov formulations los yog cov txheej txheem thov kev sib txawv.
Ntsuas cov ntsiab lus hlau ua ke nrog viscosity, deposit geometry, stencil tso, residue thiab solder ntim seem tom qab reflow.
5. Flux Classification
Lub tshuab flux tshem tawm cov oxides, tiv thaiv cov hlau hlau thaum lub sij hawm cua sov thiab txhawb kev ntub dej. Ib qho txiaj ntsig TDS yuav tsum txheeb xyuas qhov kev faib tawm flux cuam tshuam lossis coj tus nyeem ntawv mus rau cov ntaub ntawv txhawb nqa.
Txiav txim siab:
- seb chemistry yog rosin, resin, organic lossis lwm pawg;
- theem kev ua si;
- cov kev faib halide uas siv tau;
- seb cov residue tsis yog - huv, dej- soluble los yog washable;
- seb puas muaj pes tsawg-halogen thov tau txais kev txhawb nqa los ntawm txoj kev ntsuas tau hais tseg;
- seb residue compatibility tau raug soj ntsuam rau kev sim los yog conformal txheej.
Tus nomIPC J-STD-004D flux standardsuav nrog kev faib tawm thiab cov yam ntxwv uas yuav tsum tau ua rau soldering fluxes.
Kev faib tawm Flux thiab tag nrho -halogen kev lag luam thov tsis tas yuav yog tib nqe lus. Tshawb xyuas lub hauv paus xeem es tsis yog cia siab rau lo lus ib leeg. Qhov sib piv ntawmflux paste thiab solder pastetuaj yeem tiv thaiv cov khoom tsis meej pem.
Rau cov ntawv thov uas xav tau cov ntaub ntawv tswj hwm halogen, tshuaj xyuas cov txheej txheem thiab kev lees paub kev ntseeg tau cuam tshuam nrog asiab -kev cia siab zero-halogen solder muab tshuaj txhuam.
6. Viscosity thiab Test Conditions
Tus lej viscosity tsuas yog siv tau thaum paub txog cov xwm txheej kuaj.
Yog tias tsim nyog, TDS yuav tsum txheeb xyuas:
- ntsuas kub;
- ntsuas los yog xeem txoj kev;
- spindle los yog rotor;
- kev sib hloov ceev;
- txheej txheem txias;
- ntsuas ntsuas.
Ob yam khoom yuav qhia tau qhov sib txawv vim tias lawv tau sim nyob rau hauv cov xwm txheej sib txawv. Ib qho stencil- luam ntawv muab tshuaj txhuam, rab koob- muab tshuaj txhuam thiab cov khoom siv dav hlau kuj yuav tsum muaj tus cwj pwm sib txawv.
Tsis txhob sib piv cov khoom npaj rau kev tso nyiaj sib txawv los ntawm ib tus lej viscosity. Cov lus qhia rausolder paste daim ntawv thov txoj kevpiav qhia vim li cas luam ntawv, xa tawm thiab lwm yam txheej txheem xav tau cov khoom sib txawv.
7. Thixotropy thiab Slump
Solder paste yuav tsum tau ntws thaum lub zog siv, tom qab ntawd rov qab cov qauv txaus kom khaws cov duab luam tawm.
Tus cwj pwm no tuaj yeem piav qhia los ntawm thixotropy, viscosity rov qab, kev ua haujlwm poob qis lossis kev luam tawm.
Kev rov qab tsis zoo tuaj yeem tso cai rau cov nyiaj tso tawm mus rau cov ntaub ntawv nyob sib ze. Kev tiv thaiv ntau dhau tuaj yeem ua rau tsis tiav aperture filling lossis tso teeb meem.
Rau kev ua haujlwm zoo -pitch, nrhiav chav- kub thiab nce siab -cov ntaub ntawv kub slump, kuaj tej yam kev mob thiab kev lees paub. Ib nqe lus xws lizoo heev slump tsis kamtsis muaj txiaj ntsig ntau dua li txoj kev tau hais tseg thiab tau txais txiaj ntsig.
8. Tack Force thiab Tack Life
Tom qab luam ntawv, solder paste ib ntus tuav cov khoom ua ntej reflow. Tack tus cwj pwm cuam tshuam rau qhov chaw ruaj khov, txav mus los thaum tuav, ob npaug - sab sib dhos thiab tso cai ncua ua ntej rov qab.
- Tack zogpiav qhia qhov muab tshuaj txhuam lub peev xwm los tuav ib feem.
- Tack lub neejpiav qhia txog ntev npaum li cas uas tuav lub peev xwm tseem muaj txiaj ntsig.
- Stencil lub neejpiav qhia txog ntev npaum li cas cov paste tseem siv tau rau ntawm stencil raws li tau hais tseg.
Cov kab ntau lawm nrog rau qhov chaw ntev - mus rau -reflow ncua sij hawm yuav xav tau lub qhov rais sib txawv los ntawm txoj kab nrawm nrawm.
9. Stencil Lub Neej thiab Pause Rov Qab
Lub neej stencil piav qhia txog ntev npaum li cas cov tshuaj muab tshuaj tuaj yeem nyob ntawm stencil thaum tswj hwm tus cwj pwm luam tawm raws li tau teev tseg.
Qhov tshwm sim nyob ntawm chav tsev kub, av noo, kev ua haujlwm ntawm lub tshuab luam ntawv, ncua sij hawm, airflow, stencil tu, muab tshuaj ntxiv thiab cov ntsiab lus ntawm kev ua tau zoo.
Tus nqi xov xwm xws li yim teev tsis tas txhais tau tias cov khoom tuaj yeem nyob twj ywm rau lub sijhawm ntawd thiab rov pib dua yam tsis tau hloov kho.
Kev sim ntau lawm yuav tsum suav nrog kev luam ntawv tas mus li, ib qho kev npaj ncua, rov pib luam tawm, kev sib piv SPI, kev soj ntsuam ntawm kev muab tshuaj dov thiab aperture filling, thiab kuaj xyuas cov kab mob hauv qab. Pause rov qab tuaj yeem qhia ntau dua li cov ntawv xov xwm stencil-tus nqi ntawm lub neej.
10. Cia, Txee lub neej thiab ua kom sov
Cov lus qhia khaws cia yog cov khoom siv - tshwj xeeb. TDS yuav tsum hais txog qhov ntsuas kub uas yuav tsum tau muaj, tsis tau qhib lub txee lub neej, pob khoom, txheej txheem ua kom sov, tuav tom qab qhib thiab seb cov khoom siv puas yuav raug xa rov qab mus rau nws lub thawv qub.
Ua raws li tus neeg muag khoom cov lus qhia ua kom sov thiab khaws lub thawv ntim kom txog thaum lub sijhawm teev tseg. Pob loj cuam tshuam sai npaum li cas cov khoom ncav cuag nws qhov kev ua haujlwm, yog li lub koob txhaj tshuaj thiab lub thawv loj yuav tsum tsis txhob txais tib lub sijhawm sov so.
Sau cov hnub tsim khoom, hnub tas sijhawm, hnub qhib thiab sijhawm muab tso rau ntawm stencil. Cov ntawv teev sijhawm no pab taug qab qhov tsis xws luag tom qab rau cov ntaub ntawv keeb kwm tiag tiag.
Tshooj lus ntawmsolder paste txee lub neej thiab cianpog cov kev pheej hmoo tseem ceeb hauv kev nthuav dav ntau dua.
11. Printing thiab Application Window
TDS yuav pom zoo rau hom squeegee, luam ntawv ceev, siab, sib cais ceev, stencil thickness, chav tsev, dispensing siab, koob loj los yog daim ntawv thov ncua sij hawm.
Cov no yog cov txheej txheem pib, tsis yog universal tshuab zaub mov txawv. Cov txiaj ntsig tuaj yeem hloov pauv nrog aperture geometry, ntawv ci tuab, kev txhawb nqa lub rooj tsavxwm, gasketing, lub tshuab luam ntawv tsim, muab hnub nyoog thiab ib puag ncig.
Xyuas kom tseeb tias daim ntawv teev cov ntaub ntawv yog sau rau txoj kev npaj:
- stencil luam ntawv;
- syringe los yog pneumatic dispensing;
- dav hlau luam ntawv;
- rov ua dua;
- pin-in-paste.
Cov khoom siv optimized rau ib txoj kev yuav tsum tsis txhob xav tias haum rau lwm tus. Tsis yog-kev tiv tauj kev tso npe yuav xav tau lub hom phiaj- tsimdav hlau - luam ntawv solder paste.
12. Reflow, residue thiab ntxuav
TDS tej zaum yuav suav nrog cov lus qhia reflow profile lossis lub qhov rais thermal. Tshawb xyuas cov kev taw qhia ramp, soak ntau, lub sij hawm saum cov kua dej, qhov siab tshaj plaws, kev taw qhia cua txias, cua, qhov seem seem thiab cov lus pom zoo tu.
Cov khoom siv nkhaus feem ntau yog qhov pib. Qhov kawg profile nyob ntawm board thermal mass, tivthaiv txwv, tiav, alloy thiab qhov cub muaj peev xwm.
Cov ntaub ntawv seem yuav tsum teb ntau dua seb cov khoom puas tau piav qhia tias tsis yog - huv. Txiav txim siab seb qhov seem puas yog tacky, seb puas tau tso cai ntxuav, lub tshuab ntxhua khaub ncaws puas sib xws, seb cov seem puas tsim nyog rau kev kuaj hluav taws xob thiab seb cov txheej txheej puas sib xws lossis cov pov thawj kev ntseeg tau muaj.
Ib qho pom me me residue tsis tuaj yeem siv tau hluav taws xob. Kev lees txais yuav tsum yog los ntawm cov neeg siv khoom xav tau, muaj peev xwm ua haujlwm sab hauv thiab cov txheej txheem sib dhos siv tau.
Yuav Ua Li Cas Sib Piv Ob Daim Ntawv Sau Cov Ntawv Pov Thawj
Siv cov qauv sib piv ua ntej txiav txim siab txog kev thov kev lag luam lossis tus nqi.
| Specification | Nws puas tuaj yeem muab piv ncaj qha? | Yuav Qhia Li Cas |
|---|---|---|
| Alloy muaj pes tsawg leeg | Feem ntau | Txhua yam alloy thiab tso cai hloov pauv |
| Melting ntau | Feem ntau | Distinguishing melting cov ntaub ntawv los ntawm kev pom zoo qhov cub ncov |
| Hom hmoov | Ib nrab | Qhov tseeb particle range thiab sab sauv txwv |
| Cov ntsiab lus hlau | Ib nrab | Lub hauv paus thiab txoj kev xeem |
| Flux kev faib tawm | Feem ntau | Kev hloov kho tshiab, kev ua haujlwm thiab txhawb kev thov |
| viscosity | Tsuas yog nrog txoj kev sib txuam | Kub, ntsuas, ceev thiab units |
| Slump thiab tack | Tsuas yog nrog cov kev xeem sib txuam | Txoj kev, tej yam kev mob thiab kev lees txais |
| Stencil lub neej | Tsis yog los ntawm tus nqi headline xwb | Ib puag ncig, ncua lub ntsiab lus thiab rov pib tus cwj pwm |
| Cia | Feem ntau | Pob ntawv, cov xwm txheej tsis qhib thiab cov lus qhia ua kom sov |
| Phau ntawv qhia | Tsis muaj | Siv tau ntawm lub tshuab luam ntawv tiag tiag thiab stencil |
| Reflow kev taw qhia | Tsis muaj | Profile qhov tiag PCB sib dhos |
Hypothetical piv piv txwv
Cov piv txwv hauv qab no yog cov lus piav qhia thiab tsis sawv cev rau cov khoom lag luam tshwj xeeb.
Yam khoom A teev tus nqi viscosity ntsuas ntawm 25℃siv ib txoj kev tig. Cov khoom B teev tus nqi qis dua tab sis siv cov cuab yeej sib txawv, ceev thiab cov txheej txheem txias. Cov lej tsis tuaj yeem suav ncaj qha.
Cov kauj ruam tom ntej yog kom tau txais cov xwm txheej sib piv los yog ntsuas ob qho tib si hauv tib qho kev sim luam ntawv. Qhov qis tshaj tawm viscosity tsis ua pov thawj yooj yim luam ntawv, tso tawm zoo dua lossis ntau dua cov txheej txheem ruaj ntseg.
Revision Control thiab Purchasing Specifications
Kev pom zoo yuav tsum suav nrog kev tswj cov ntaub ntawv, tsis yog cov khoom siv xwb.
Cov ntaub ntawv:
- TDS kho tus lej;
- siv tau los yog hnub tshaj tawm;
- SDS kho;
- pom zoo cov khoom code thiab pob;
- pom zoo alloy thiab hmoov hom;
- xav tau cov khoom CoA;
- tus neeg muab khoom hloov pauv - cov cai ceeb toom.
TDS yuav tsis yog daim ntawv cog lus lav. Thaum ib qho parameter tseem ceeb rau kev lees txais los yog kev ntseeg siab ntawm kev tsim khoom, tso qhov kev pom zoo yuav tsum tau ua hauv kev yuav khoom lossis daim ntawv cog lus zoo thiab txhais tau tias yuav ua raws li qhov yuav tsum tau ua.
Cov chij liab nyob rau hauv Solder Paste TDS
Thov kom meej meej thaum daim ntawv teev cov ntaub ntawv:
- hais tias tsuas yog lead-dawb yam tsis tau txheeb xyuas cov hlau;
- muab cov hmoov hom tsis muaj particle ntau;
- teev viscosity yam tsis muaj kev sim;
- thov tsis muaj- ntxuav yam tsis muaj kev faib tawm lossis cov pov thawj seem;
- muab lub neej txee yam tsis muaj kev cia khoom;
- sau stencil lub neej yam tsis tau txhais ib puag ncig;
- nthuav tawm ib qho rov qab nkhaus raws li siv tau rau txhua lub rooj tsavxwm;
- siv xoom-halogen lossis halogen- cov lus pub dawb yam tsis muaj lub hauv paus kev xeem;
- tsis muaj hnub hloov kho;
- sib xyaw cov txiaj ntsig zoo thiab lav qhov txwv tsis pub txheeb xyuas lawv;
- tsis muaj txoj hauv kev rau SDS lossis ntau - cov ntaub ntawv qib.
Cov ntaub ntawv ploj tsis tuaj yeem ua rau cov khoom siv tsis zoo, tab sis nws tiv thaiv kev sib piv kev ua tiav.
Dab tsi TDS tsis tuaj yeem ua pov thawj: SMT Daim Ntawv Xeem Xeem
Kev tshuaj xyuas cov ntaub ntawv yuav tsum ua rau muaj kev sim ntsuas.
Ua ntej luam ntawv
- Sau cov khoom, ntau tus lej thiab hnub tas sijhawm.
- Tshawb xyuas keeb kwm khaws cia thiab ua kom sov.
- Cov ntaub ntawv sib xyaw cov lus qhia, stencil condition thiab chav nyob.
- Sau lub tshuab luam ntawv teeb tsa thiab qhov tseem ceeb aperture geometry.
Thaum luam ntawv
- Ntsuas dov, aperture filling thiab tso tawm.
- Ntsuas qhov ntim ntawm qhov tso nyiaj, qhov siab thiab qhov sib txawv ntawm cheeb tsam.
- Saib xyuas kev hloov pauv kev ua haujlwm thiab luam tawm - mus rau - luam ntawv sib xws.
- suav nrog kev npaj ncua thiab rov pib dua.
- Tshawb xyuas cov stencil hauv qab kom muaj kab mob.
Thaum Ntxov thiab Rov Qab
- Txheeb xyuas cov khoom ruaj khov thiab ruaj khov.
- Ntsuas qhov reflow profile ntawm lub rooj tsavxwm tiag.
- Tshawb xyuas ntub dej, solder balling, tombstoning, bridging thiab residue.
Tom qab Reflow
- Siv kev tshuaj xyuas qhov muag lossis AOI raws li qhov tsim nyog.
- Siv X-ray rau cov pob qij txha zais thaum xav tau.
- Ua cov khoom siv hluav taws xob, kev huv huv lossis kev ntseeg siab kuaj raws li cov khoom xav tau.
- Sau cov khoom siv ntau thiab cov txheej txheem.
Cov lus qhia rausolder paste soj ntsuam thiab PCB zoopiav qhia vim li cas cov ntaub ntawv luam tawm yuav tsum tau sau ua ntej tso thiab rov qab zais cov thawj tso nyiaj. Dav davsolder kev ntsuam xyuas txoj kevtuaj yeem txhawb txoj kev npaj tsim nyog kawg.
FAQ
Q: Puas yog TDS tus nqi lav rau txhua pawg?
A: Tsis tas li. Ntau qhov tseem ceeb yog cov txiaj ntsig zoo lossis cov xwm txheej pom zoo. Siv CoA, kev yuav khoom tshwj xeeb lossis kev pom zoo zoo thaum muaj ntau ntau - txwv tshwj xeeb yuav tsum tau.
Q: Puas yog ob qhov viscosity piv tau ncaj qha?
A: Tsuas yog thaum cov chav nyob, cov qauv ntsuas, qhov kub thiab txias, cov khoom siv thiab cov txheej txheem txias sib piv.
Q: Puas yog Hom 5 solder paste ib txwm luam tawm zoo dua li Hom 4?
A: Tsis yog. Cov khoom me me tuaj yeem muab cov duab geometric ntau dua, tab sis kev luam ntawv kuj yog nyob ntawm flux rheology, stencil tsim, cov ntsiab lus hlau thiab kev tswj cov txheej txheem.
Q: Puas yog tsis muaj - ntxuav cov tshuaj txhuam hniav tsis tas yuav tsum tau ntxuav?
A: Tsis yog. Kev ntxuav tej zaum tseem yuav xav tau rau txheej txheej, siab -impedance circuits, zoo li, residue compatibility lossis cov neeg siv khoom xav tau.
Q: Puas tuaj yeem pom zoo reflow profile tuaj yeem luam ncaj qha rau hauv qhov cub?
A: Tsis yog. Nws yog lub qhov rais pib. Qhov profile kawg yuav tsum tau ntsuas thiab hloov kho ntawm qhov tseeb PCB sib dhos.
Q: Dab tsi yuav tsum thov kev yuav khoom ntxiv rau TDS?
A: Thov SDS, kev kho cov ntaub ntawv tam sim no, ntim khoom thiab cov ntaub ntawv khaws cia, cov ntaub ntawv xeem siv tau, cov kev xaiv taug qab thiab CoA thaum xav tau.
Xaus
Ib tug solder paste TDS yuav tsum raug kho raws li daim ntawv txiav txim siab, tsis yog ua tiav cov khoom lav. Paub meej tias cov alloy, melting cwj pwm, hmoov faib thiab flux faib ua ntej. Tom qab ntawd sib piv cov ntsiab lus hlau, viscosity, slump, tack, stencil life, cia thiab daim ntawv thov kev taw qhia raws li qhov sib npaug ntawm qhov kev xeem.
Qhov kev txiav txim zaum kawg yuav tsum yog los ntawm cov ntaub ntawv uas yuav tsum tau ua thiab kev tswj xyuas SMT. Rov qab luam ntawv, SPI, ntsuas reflow profileing thiab post-reflow tshuaj xyuas seb cov khoom puas haum rau PCB, cov khoom siv thiab lub hom phiaj kev ntseeg siab.
Rau kev pom zoo raws li alloy, hmoov Hom, flux system, stencil geometry, cia thiab daim ntawv thov yuav tsum tau, xa cov txheej txheem cov ntsiab lus los ntawm lubYIHMA nplooj ntawv nug.
