110 cov ntsiab lus kev paub ntawm SMT nti ua - Ntu 1
1. Feem ntau hais lus, qhov kub ntawm SMT nti ua rhiav yog 25 ± 3 ℃;
2. Cov ntaub ntawv thiab cov khoom uas xav tau rau kev luam ntawv luam tawm, xws li cov tshuaj txhuam hniav, steel phaj, scraper, daim ntawv so, ntawv tsis muaj plua plav, tshuaj ntxuav tes thiab sib tov riam;
3. Qhov sib xyaw ua ke ntawm solder paste alloy yog Sn / Pb alloy, thiab qhov sib faib alloy yog 63 / 37;
4. Muaj ob yam tseem ceeb hauv cov tshuaj txhuam hniav, qee qhov yog tin hmoov thiab flux.
5. Lub luag haujlwm tseem ceeb ntawm cov dej ntws hauv vuam yog tshem tawm oxide, ua rau lub zog sab nraud ntawm cov molten tin thiab tsis txhob reoxidation.
6. Qhov ntim piv ntawm tin hmoov particles rau flux yog hais txog 1: 1 thiab cov khoom sib piv yog li 9: 1;
7. Lub hauv paus ntsiab lus ntawm solder paste yog thawj zaug tawm;
8. Thaum siv cov tshuaj txhuam hniav hauv Kaifeng, nws yuav tsum tau rov ua kom sov thiab sib tov los ntawm ob txheej txheem tseem ceeb;
9. Cov txheej txheem tsim khoom ntawm steel phaj yog: etching, laser thiab electroforming;
10. Lub npe tag nrho ntawm SMT chip processing yog nto mount (los yog mounting) technology, uas txhais tau hais tias zoo li adhesion (los yog mounting) technology hauv Suav;
11. Lub npe tag nrho ntawm ESD yog electrostatic paug, uas txhais tau hais tias electrostatic tawm hauv Suav;
12. Thaum tsim cov khoom siv SMT, qhov kev pab cuam suav nrog tsib ntu: PCB cov ntaub ntawv;cov ntaub ntawv cim;feeder cov ntaub ntawv;cov ntaub ntawv puzzle;cov ntaub ntawv ib feem;
13. Lub melting point ntawm Sn / Ag / Cu 96.5 / 3.0 / 0.5 yog 217c;
14. Qhov ntsuas kub thiab av noo ntawm qhov chaw ziab qhov cub yog <10%;
15. Cov khoom siv Passive feem ntau siv suav nrog kev ua haujlwm, kev ua haujlwm, qhov taw tes inductance (los yog diode), thiab lwm yam;cov khoom siv muaj xws li transistors, IC, thiab lwm yam;
16. Cov khoom siv raw ntawm feem ntau siv SMT steel phaj yog stainless hlau;
17. Lub thickness ntawm feem ntau siv SMT steel phaj yog 0.15mm (los yog 0.12mm);
18. Cov ntau yam ntawm cov nqi hluav taws xob muaj xws li kev tsis sib haum xeeb, kev sib cais, induction, electrostatic conduction, thiab lwm yam;Kev cuam tshuam ntawm electrostatic nqi ntawm kev lag luam hluav taws xob yog ESD tsis ua hauj lwm thiab cov pa phem electrostatic;Peb lub hauv paus ntsiab lus ntawm kev tshem tawm electrostatic yog electrostatic neutralization, grounding thiab shielding.
19. Qhov ntev x dav ntawm lus Askiv system yog 0603 = 0.06inch * 0.03inch, thiab hais tias ntawm metric system yog 3216 = 3.2mm * 1.6mm;
20. Code 8 "4" ntawm erb-05604-j81 qhia tias muaj 4 circuits, thiab tus nqi kuj yog 56 ohm.Lub capacitance ntawm eca-0105y-m31 yog C = 106pf = 1NF = 1 × 10-6f;
21. Lub npe Suav tag nrho ntawm ECN yog daim ntawv ceeb toom hloov pauv engineering;Lub npe Suav tag nrho ntawm SWR yog: kev txiav txim ua haujlwm nrog cov kev xav tau tshwj xeeb, uas yog qhov tsim nyog yuav tsum tau kos npe los ntawm cov tuam haujlwm cuam tshuam thiab muab faib rau hauv nruab nrab, uas yog qhov tseem ceeb;
22. Cov ntsiab lus tshwj xeeb ntawm 5S yog tu, txheeb xyuas, tu, tu thiab ua kom zoo;
23. Lub hom phiaj ntawm PCB lub tshuab nqus tsev ntim yog tiv thaiv plua plav thiab ya raws;
24. Txoj cai tswjfwm zoo yog: tag nrho cov kev tswj xyuas zoo, ua raws li cov txheej txheem, muab cov khoom zoo los ntawm cov neeg siv khoom;txoj cai ntawm kev koom tes tag nrho, ua haujlwm raws sij hawm, kom ua tiav qhov tsis zoo;
25. Peb txoj cai tsis zoo yog: tsis lees txais cov khoom tsis raug, tsis muaj kev tsim cov khoom tsis raug thiab tsis muaj kev tawm ntawm cov khoom tsis raug;
26. Ntawm xya QC txoj kev, 4m1h hais txog (Suav): tib neeg, tshuab, khoom siv, qauv thiab ib puag ncig;
27. Cov muaj pes tsawg leeg ntawm solder paste muaj xws li: hlau hmoov, Rongji, flux, anti ntsug ntws tus neeg saib xyuas thiab active neeg sawv cev;Raws li kev tivthaiv, cov hmoov hlau nyiaj rau 85-92%, thiab qhov ntim ntawm cov hlau hmoov nyiaj rau 50%;ntawm lawv, cov khoom tseem ceeb ntawm cov hmoov hlau yog cov tin thiab txhuas, qhov sib faib yog 63 / 37, thiab cov ntsiab lus melting yog 183 ℃;
28. Thaum siv cov tshuaj txhuam hniav, nws yog ib qho tsim nyog yuav tsum tau muab nws tawm ntawm lub tub yees kom rov ua kom sov.Lub hom phiaj yog ua kom qhov kub thiab txias ntawm solder paste rov qab mus rau qhov kub thiab txias rau kev luam ntawv.Yog tias qhov kub tsis rov qab los, cov hlaws hlaws yooj yim tshwm sim tom qab PCBA nkag mus rau reflow;
29. Cov ntaub ntawv muab cov ntaub ntawv ntawm lub tshuab suav nrog: daim ntawv npaj, daim ntawv sib txuas lus tseem ceeb, daim ntawv sib txuas lus thiab daim ntawv txuas ceev;
30. Cov txheej txheem PCB qhov chaw ntawm SMT muaj xws li: Nqus positioning, mechanical hole positioning, double clamp positioning and board edge positioning;
31. Qhov kev tiv thaiv nrog 272 silk screen (cim) yog 2700 Ω, thiab lub cim (silk screen) ntawm kev tiv thaiv nrog tus nqi tsis kam ntawm 4.8m Ω yog 485;
32. Silk screen printing ntawm BGA lub cev muaj xws li cov chaw tsim khoom, chaw tsim khoom tus lej, tus qauv thiab Datecode / (ntau yam tsis muaj);
33. Pitch ntawm 208pinqfp yog 0.5mm;
34. Ntawm xya txoj kev QC, daim duab pob txha yog tsom rau kev nrhiav kev sib raug zoo;
37. CPK hais txog cov txheej txheem muaj peev xwm raws li kev coj ua tam sim no;
38. Flux pib kis nyob rau hauv qhov kub thiab txias cheeb tsam rau tshuaj ntxuav;
39. Qhov zoo tshaj plaws txias cheeb tsam nkhaus thiab reflux cheeb tsam nkhaus yog daim iav duab;
40. RSS nkhaus yog cua sov → qhov kub thiab txias → reflux → txias;
41. Cov khoom siv PCB peb siv yog FR-4;
42. PCB warpage tus qauv tsis pub tshaj 0.7% ntawm nws kab pheeb ces kaum;
43. Lub laser incision ua los ntawm stencil yog ib txoj kev uas yuav reprocessed;
44. Txoj kab uas hla ntawm BGA pob uas feem ntau siv rau ntawm lub rooj tsavxwm loj ntawm lub computer yog 0.76mm;
45. ABS system yog qhov zoo ua haujlwm;
46. Qhov yuam kev ntawm ceramic nti capacitor eca-0105y-k31 yog ± 10%;
47. Panasert Matsushita puv active Mounter nrog ib tug voltage ntawm 3?200 ± 10vac;
48. Rau SMT qhov ntim ntim, txoj kab uas hla ntawm daim kab xev reel yog 13 ntiv tes thiab 7 ntiv tes;
49. Qhov qhib ntawm SMT feem ntau yog 4um me dua li ntawm PCB ncoo, uas tuaj yeem zam qhov tshwm sim ntawm cov pob tsis zoo;
50. Raws li PCBA kev soj ntsuam cov cai, thaum lub dihedral lub kaum sab xis yog ntau tshaj 90 degrees, nws qhia tau hais tias lub solder paste tsis muaj adhesion rau yoj solder lub cev;
51. Tom qab IC tau ntim, yog tias cov av noo ntawm daim npav siab dua 30%, nws qhia tau tias IC yog ntub thiab hygroscopic;
52. Qhov tseeb ntawm qhov sib piv thiab ntim piv ntawm tin hmoov rau flux hauv solder paste yog 90%: 10%, 50%: 50%;
53. Cov kev paub txog kev sib raug zoo thaum ntxov yog los ntawm kev ua tub rog thiab Avionics hauv nruab nrab-1960s;
54. Cov ntsiab lus ntawm Sn thiab Pb hauv solder paste uas feem ntau siv hauv SMT yog txawv
Post lub sij hawm: Sep-29-2020