110 cov ntsiab lus kev paub ntawm SMT nti ua ntu 2
56. Nyob rau hauv thaum ntxov 1970s, muaj ib hom tshiab ntawm SMD nyob rau hauv kev lag luam, uas yog hu ua "sau ko taw tsawg nti carrier", uas feem ntau yog hloov los ntawm HCC;
57. Qhov tsis kam ntawm lub module nrog lub cim 272 yuav tsum yog 2.7K ohm;
58. Lub peev xwm ntawm 100nF module yog tib yam li ntawm 0.10uf;
eutectic point ntawm 63Sn + 37Pb yog 183 ℃;
60. Cov khoom siv dav siv ntau ntawm SMT yog ceramics;
61. Qhov kub siab tshaj plaws ntawm qhov cub reflow kub nkhaus yog 215C;
62. Qhov kub ntawm lub cub tawg yog 245c thaum kuaj xyuas;
63. Rau SMT qhov chaw, txoj kab uas hla ntawm coiling phaj yog 13 nti thiab 7 nti;
64. Lub hom qhib steel phaj yog square, daim duab peb sab, puag ncig, lub hnub qub zoo li tus thiab tiaj;
65. Tam sim no siv lub computer sab PCB, nws cov khoom siv raw yog: iav fiberboard;
66. Dab tsi ntawm substrate ceramic phaj yog cov tshuaj pleev xim ntawm sn62pb36ag2 siv;
67. Rosin raws li flux tuaj yeem muab faib ua plaub hom: R, RA, RSA thiab RMA;
68. Txawm hais tias qhov tsis kam ntawm SMT seem yog kev taw qhia los yog tsis;
69. Tam sim no solder paste nyob rau hauv kev ua lag luam tsuas yog xav tau 4 teev ntawm lub sij hawm nplaum hauv kev xyaum;
70. Cov huab cua ntxiv ib txwm siv los ntawm cov khoom siv SMT yog 5kg / cm2;
71. Yuav siv txoj kev vuam zoo li cas thaum PTH nyob rau sab pem hauv ntej tsis dhau ntawm lub qhov cub tin nrog SMT;
72. Kev tshuaj ntsuam xyuas ntau yam ntawm SMT: kev tshuaj xyuas qhov muag, X-ray tshuaj xyuas thiab kev tshuaj xyuas lub tshuab tsis pom kev
73. Cov txheej txheem cua sov ntawm ferrochrome kho qhov chaw yog conduction + convection;
74. Raws li cov ntaub ntawv BGA tam sim no, sn90 pb10 yog thawj pob tin;
75. Kev tsim cov hlau phaj: laser txiav, electroforming thiab tshuaj etching;
76. Qhov kub ntawm qhov cub vuam: siv tus pas ntsuas kub los ntsuas qhov ntsuas kub;
77. Thaum SMT SMT semi-tiav khoom raug xa tawm, cov khoom raug tsau rau ntawm PCB;
78. Cov txheej txheem ntawm kev tswj xyuas niaj hnub zoo tqc-tqa-tqm;
79. ICT xeem yog rab koob txaj kuaj;
80. ICT xeem tuaj yeem siv los ntsuas cov khoom siv hluav taws xob, thiab xaiv qhov kev xeem zoo li qub;
81. Cov yam ntxwv ntawm soldering tin yog tias lub melting point yog qis dua lwm yam hlau, lub cev lub cev muaj zog txaus, thiab fluidity yog zoo dua li lwm yam hlau nyob rau hauv qis kub;
82. Qhov ntsuas nkhaus yuav tsum tau ntsuas los ntawm qhov pib thaum cov txheej txheem ntawm vuam qhov cub tawg tau hloov pauv;
83. Siemens 80F / S belongs rau hluav taws xob tswj tsav;
84. Lub solder paste thickness gauge siv laser lub teeb los ntsuas: solder paste degree, solder paste thickness thiab solder paste printing dav;
85. SMT qhov chaw yog muab los ntawm oscillating feeder, disc feeder thiab coiling siv feeder;
86. Cov koom haum twg yog siv rau hauv cov khoom siv SMT: cam qauv, sab bar qauv, ntsia hlau qauv thiab zawv zawg qauv;
87. Yog tias tsis tuaj yeem lees paub qhov kev tshuaj xyuas qhov muag, BOM, kev pom zoo ntawm cov chaw tsim khoom thiab cov qauv pawg thawj coj saib yuav tsum ua raws;
88. Yog tias cov txheej txheem ntim khoom yog 12w8p, lub pinth nplai ntawm cov txee yuav tsum raug kho rau 8 hli txhua zaus;
89. Hom vuam tshuab: cua kub vuam rauv, nitrogen vuam rauv, laser vuam rauv thiab infrared vuam rauv;
90. Muaj txoj hauv kev rau SMT qhov chaw coj mus kuaj: streamline ntau lawm, tes tshuab luam ntawv mounting thiab tes luam ntawv tes mounting;
91. Cov khoom siv kos duab feem ntau yog: lub voj voog, ntoo khaub lig, square, pob zeb diamond, daim duab peb sab, Wanzi;
92. Vim hais tias cov reflow profile tsis yog teem kom zoo nyob rau hauv SMT seem, nws yog lub preheating cheeb tsam thiab cua txias cheeb tsam uas yuav ua rau lub micro tawg ntawm qhov chaw;
93. Ob qhov kawg ntawm SMT qhov chaw yog cua sov tsis sib luag thiab yooj yim rau daim ntawv: khoob vuam, sib txawv thiab cov ntsiav tshuaj pob zeb;
94. SMT qhov chaw kho tej yam xws li: soldering hlau, cua kub extractor, tin phom, tweezers;
95. QC muab faib ua IQC, IPQC, .FQC thiab OQC;
96. Kev kub ceev Mounter tuaj yeem mount resistor, capacitor, IC thiab transistor;
97. Cov yam ntxwv ntawm cov hluav taws xob zoo li qub: me me tam sim no thiab zoo heev los ntawm cov av noo;
98. Lub sijhawm voj voog ntawm lub tshuab ua haujlwm siab thiab lub tshuab universal yuav tsum sib npaug kom deb li deb tau;
99. Lub ntsiab lus tseeb ntawm kev ua tau zoo yog ua tau zoo hauv thawj zaug;
100. Lub tshuab muab tso rau yuav tsum lo me me ua ntej thiab tom qab ntawd loj qhov chaw;
101. BIOS yog ib qho yooj yim input / output system;
102. SMT qhov chaw tuaj yeem muab faib ua cov hlau lead thiab tsis muaj hlau lead raws li seb puas muaj ko taw;
103. Muaj peb hom kev siv cov tshuab tso rau hauv: kev tso chaw tas mus li, kev tso chaw tas mus li thiab ntau qhov chaw tso rau tes;
104. SMT tuaj yeem tsim tsis muaj loader;
105. Cov txheej txheem SMT muaj cov txheej txheem pub mis, tshuab luam ntawv tshuab luam ntawv, kev kub ceev tshuab, universal tshuab, vuam tam sim no thiab phaj sau tshuab;
106. Thaum qhov kub thiab av noo rhiab qhov chaw qhib, cov xim hauv cov av noo daim npav yog xiav, thiab cov khoom siv tau;
107. Tus qauv dimension ntawm 20 hli tsis yog qhov dav ntawm sawb;
108. Ua rau luv Circuit Court vim kev luam ntawv tsis zoo:
ib.Yog hais tias cov ntsiab lus hlau ntawm solder paste tsis zoo, nws yuav ua rau tawg
b.Yog tias qhov qhib ntawm lub phaj steel loj dhau, cov ntsiab lus tin ntau dhau
c.Yog tias qhov zoo ntawm cov phaj hlau tsis zoo thiab cov tin tsis zoo, hloov lub laser txiav template
D. muaj residual solder paste nyob rau sab nraub qaum ntawm stencil, txo qhov siab ntawm scraper, thiab xaiv lub tshuab nqus tsev tsim nyog thiab hnyav
109. Lub hom phiaj tseem ceeb ntawm engineering ntawm txhua cheeb tsam ntawm qhov profile ntawm reflow rauv yog raws li nram no:
ib.Preheat cheeb tsam;engineering lub tswv yim: flux transpiration hauv solder paste.
b.Kub sib npaug zos;engineering lub hom phiaj: flux activation kom tshem tawm oxides;transpiration ntawm residual noo noo.
c.Reflow cheeb tsam;engineering hom phiaj: solder melting.
d.Qhov chaw txias;engineering hom phiaj: alloy solder sib koom ua ke, ib feem ko taw thiab ncoo tag nrho;
110. Nyob rau hauv SMT SMT txheej txheem, lub ntsiab ua rau ntawm solder hlaws yog: tsis zoo depiction ntawm PCB ncoo, tsis zoo depiction ntawm steel phaj qhib, ntau qhov tob los yog siab ntawm kev tso kawm, loj heev nce txoj kab nqes ntawm profile nkhaus, solder paste collapse thiab tsis tshua muaj paste viscosity .
Post lub sij hawm: Sep-29-2020