Abubuwan ilimi 110 na sarrafa guntu SMT - Kashi na 1
1. Kullum magana, yawan zafin jiki na SMT guntu sarrafa bitar shine 25 ± 3 ℃;
2. Kayayyaki da abubuwan da ake buƙata don bugu na liƙa mai siyarwa, kamar manna mai siyarwa, farantin karfe, gogewa, takarda gogewa, takarda mara ƙura, wanka da wuƙa mai haɗawa;
3. Abubuwan da aka gama gama gari na kayan kwalliyar kayan kwalliyar Sn / Pb alloy, kuma rabon gami shine 63/37;
4. Akwai manyan abubuwa guda biyu a cikin manna na solder, wasu su ne foda da ruwa.
5. Babban aikin juzu'i a cikin walda shine cire oxide, lalata tashin hankalin waje na narkakkar tin da kuma guje wa reoxidation.
6. Matsakaicin ƙarar ƙwayar tin foda zuwa juzu'i shine game da 1: 1 kuma ɓangaren ɓangaren shine game da 9: 1;
7. Ka'idar solder manna ne na farko a farkon fitar;
8. Lokacin da aka yi amfani da man fetur mai sayarwa a cikin Kaifeng, dole ne a sake sakewa da haɗuwa ta hanyoyi guda biyu masu mahimmanci;
9. Hanyoyin masana'antu na yau da kullum na farantin karfe sune: etching, Laser da electroforming;
10. Cikakken sunan SMT guntu sarrafa shi ne fasahar mount (ko mounting), wanda ke nufin fasahar adhesion (ko hawan) bayyanar a Sinanci;
11. Cikakken sunan ESD shine fitarwa na lantarki, wanda ke nufin fitarwar lantarki a cikin Sinanci;
12. Lokacin ƙirƙirar shirin kayan aikin SMT, shirin ya haɗa da sassa biyar: bayanan PCB;alamar bayanai;bayanan ciyarwa;bayanai masu wuyar warwarewa;bayanan bangare;
13. Matsayin narkewa na Sn / Ag / Cu 96.5 / 3.0 / 0.5 shine 217c;
14. The aiki dangi zafin jiki da zafi na sassa bushe tanda ne <10%;
15. Na'urorin wucewa da aka saba amfani da su sun haɗa da juriya, ƙarfin ƙarfi, inductance aya (ko diode), da dai sauransu;na'urori masu aiki sun haɗa da transistor, IC, da dai sauransu;
16. The albarkatun kasa na saba amfani da SMT karfe farantin ne bakin karfe;
17. The kauri na fiye amfani da SMT karfe farantin ne 0.15mm (ko 0.12mm);
18. Daban-daban na cajin lantarki sun haɗa da rikici, rabuwa, ƙaddamarwa, ƙaddamarwa na lantarki, da dai sauransu;tasirin cajin lantarki akan masana'antar lantarki shine gazawar ESD da gurɓataccen iska;ka'idoji guda uku na kawar da electrostatic sune neutralization na electrostatic, grounding da garkuwa.
19. Tsawon x nisa na tsarin Ingilishi shine 0603 = 0.06inch * 0.03inch, kuma na tsarin awo shine 3216 = 3.2mm * 1.6mm;
20. Code 8 "4" na erb-05604-j81 ya nuna cewa akwai 4 da'irori, kuma juriya darajar ne 56 ohm.Matsakaicin ƙarfin eca-0105y-m31 shine C = 106pf = 1NF = 1 × 10-6f;
21. Cikakken sunan Sinanci na ECN shine sanarwar canjin injiniya;cikakken sunan Sinanci na SWR shine: tsarin aiki tare da bukatu na musamman, wanda ya zama dole don sake sa hannu ta sassan da suka dace kuma a rarraba su a tsakiya, wanda ke da amfani;
22. Abubuwan da ke ciki na musamman na 5S suna tsaftacewa, rarrabawa, tsaftacewa, tsaftacewa da inganci;
23. Manufar PCB injin marufi shine don hana ƙura da danshi;
24. Manufar ingancin ita ce: duk kula da inganci, bi ka'idoji, samar da ingancin da abokan ciniki ke buƙata;manufofin cikakken sa hannu, sarrafa lokaci, don cimma lahani na sifili;
25. The uku babu ingancin manufofin su ne: rashin yarda da m kayayyakin, babu masana'antu na m kayayyakin da babu fitar da m kayayyakin;
26. Daga cikin hanyoyin QC guda bakwai, 4m1h yana nufin ( Sinanci): mutum, inji, kayan aiki, hanya da yanayi;
27. A abun da ke ciki na solder manna hada da: karfe foda, Rongji, juyi, anti tsaye kwarara wakili da kuma aiki wakili;bisa ga bangaren, da karfe foda lissafin 85-92%, da kuma girma integral karfe foda lissafin for 50%;Daga cikin su, manyan abubuwan da ke cikin foda na karfe sune tin da gubar, rabon shine 63/37, kuma wurin narkewa shine 183 ℃;
28. Lokacin amfani da manna solder, wajibi ne a cire shi daga firiji don dawo da zafin jiki.Manufar ita ce a sanya yawan zafin jiki na manna mai siyarwa ya koma yanayin zafi na yau da kullun don bugawa.Idan ba a dawo da zafin jiki ba, ƙwanƙwasa mai siyar yana da sauƙin faruwa bayan PCBA ya shiga reflow;
29. Siffofin samar da takaddun na injin sun haɗa da: tsari na shirye-shirye, nau'in sadarwar fifiko, hanyar sadarwa da hanyar haɗin kai mai sauri;
30. Hanyoyin sakawa na PCB na SMT sun haɗa da: Matsayin Vacuum, Matsayin rami na inji, madaidaicin matsi guda biyu da matsayi na allo;
31. Juriya tare da allon siliki na 272 (alama) shine 2700 Ω, kuma alamar (alamar siliki) na juriya tare da ƙimar juriya na 4.8m Ω shine 485;
32. Silk allo bugu a kan BGA jiki ya hada da manufacturer, manufacturer ta part number, misali da Datecode / (yawan babu);
33. Pitch na 208pinqfp shine 0.5mm;
34. Daga cikin hanyoyin QC guda bakwai, zane-zanen kashin kifi yana mai da hankali kan gano alakar da ke haifar da;
37. CPK yana nufin ikon aiwatarwa a ƙarƙashin aikin yanzu;
38. Flux ya fara motsawa a cikin yankin zafin jiki akai-akai don tsaftace sinadarai;
39. Maƙasudin sanyaya yanki mai lankwasa da reflux zone kwana su ne madubi images;
40. RSS curve yana dumama → akai-akai zazzabi → reflux → sanyaya;
41. Kayan PCB da muke amfani da su shine FR-4;
42. PCB mizanin warpage bai wuce 0.7% na diagonal ba;
43. Ƙwararren Laser da aka yi ta hanyar stencil hanya ce da za a iya sake sarrafawa;
44. Diamita na ƙwallon BGA da ake yawan amfani da shi akan babban allon kwamfuta shine 0.76mm;
45. Tsarin ABS shine daidaitawa mai kyau;
46. Kuskuren yumbu capacitor eca-0105y-k31 shine ± 10%;
47. Panasert Matsushita cikakken aiki Mounter da wani irin ƙarfin lantarki na 3?200 ± 10vac;
48. Domin SMT sassa marufi, da diamita na tef reel ne 13 inci da 7 inci;
49. Buɗewar SMT yawanci 4um ya fi na PCB kushin, wanda zai iya guje wa bayyanar ƙwallon ƙarancin solder;
50. Bisa ga PCBA dubawa dokokin, a lokacin da dihedral kwana ne fiye da 90 digiri, shi ya nuna cewa solder manna ba shi da wani mannewa da kalaman solder jiki;
51. Bayan an cire IC, idan zafi a kan katin ya fi 30%, yana nuna cewa IC yana damp da hygroscopic;
52. Madaidaicin sashi rabo da girma rabo na tin foda zuwa juyi a solder manna ne 90%: 10%, 50%: 50%;
53. The farkon bayyanar bonding basira samo asali daga soja da kuma Avionics filayen a tsakiyar 1960s;
54. Abubuwan da ke cikin Sn da Pb a cikin manna waɗanda aka fi amfani da su a cikin SMT sun bambanta.
Lokacin aikawa: Satumba-29-2020