Don allon SMT, musamman don BGA da IC da aka liƙa akan buƙatun gudanarwa dole ne su daidaita, ramin toshe rami convex concave da ko rage 1 mil, ba zai iya samun gefen ramin jagora akan kwano ja, ramin jagora shine beads na Tibet, don saduwa da su. abokin ciniki bukatun, gudanar da toshe rami tsari ne multifarious, exceptionally dogon tsari kwarara, tsari iko wuya, sau da yawa a zafi iska matakin da kore mai juriya ga soldering gwaji kashe;Bayan warkewa, fashewar mai da sauran matsaloli na faruwa.Dangane da ainihin yanayin samarwa, ana taƙaita matakai daban-daban na toshe PCB, kuma ana kwatanta tsari da fa'idodi da rashin amfani da fa'ida:
Lura: The aiki manufa na zafi iska matakin ne don amfani da zafi iska don cire wuce haddi solder a kan surface da rami na buga kewaye allon, da kuma sauran solder ne ko'ina rufe a kan kushin da bude solder line da surface hatimin ado, wanda shi ne daya. na hanyoyin jiyya na farfajiya na allon kewayawa da aka buga.
I. Toshe tsarin rami bayan matakin zafi mai zafi
Aiki kwarara: farantin surface tarewa waldi →HAL→ toshe rami → curing.An karɓi tsarin ramin da ba na toshe ba don samarwa.Bayan daidaitawar iska mai zafi, ana amfani da farantin allo na aluminum ko allon tawada don kammala filogi na duk kagara kamar yadda abokan ciniki ke buƙata.Toshe rami tawada na iya zama m tawada ko thermosetting tawada, domin tabbatar da daidaito na rigar fim launi, filogi rami tawada ya fi amfani da wannan tawada allo.Wannan tsari na iya tabbatar da cewa zafin iska mai zafi bayan ramin ba ya sauke mai, amma mai sauƙin haifar da bututun gurɓataccen ramin tawada, rashin daidaituwa.Abokin ciniki yana da wuyar yin walda mai kama-da-wane lokacin amfaniInjin SMTdon hawa (musamman a BGA).Don haka yawancin abokan ciniki ba sa yarda da wannan hanyar.
II.Haɓakar iska mai zafi kafin aiwatar da toshe rami
2.1 Graphic canja wurin ne da za'ayi bayan toshe rami, solidification da nika na aluminum takardar
Wannan tsari na tsari tare da injin hakowa na CNC, hakowa don toshe takardar aluminum ramin, wanda aka yi da allo, rami mai toshe, tabbatar da cewa ramin filogi cikakken ramin toshe, toshe rami tawada filogi rami tawada, kuma akwai tawada thermosetting, halayensa dole ne su zama taurin, resin shrinkage canji ne karami, da kuma rami bango dauri karfi da kyau.Tsarin ya kwarara shine kamar haka: pretreatment → toshe rami → nika farantin → hoto canja wuri → etching → farantin surface juriya waldi
Ta wannan hanya za a iya tabbatar da santsi conduction na toshe rami, zafi iska leveling ba zai zama mai, gefen rami ayukan iska mai ƙarfi kashe ingancin matsaloli kamar man fetur, amma aiwatar da ake bukata na yarwa thickening jan karfe, sa wannan rami bango jan karfe kauri hadu. abokin ciniki misali, don haka dukan hukumar high bukatar jan plating, kuma yana da wani babban bukata a kan yi na nika inji, don tabbatar da cewa guduro a saman na jan karfe da kyau cire, kamar jan karfe surface ne mai tsabta da kuma ba gurbata. .Yawancin tsire-tsire na PCB ba su da tsarin jan ƙarfe mai kauri na lokaci ɗaya, kuma aikin kayan aikin bai kai ga buƙatun ba, sakamakon wannan tsari ba a amfani da shi a cikin tsire-tsire na PCB.
2.2 Block waldi na allo bugu allon surface kai tsaye bayan toshe rami na aluminum takardar
Wannan tsari yana amfani da na'ura mai sarrafawa na NUMERICAL, ƙaddamar da takardar aluminum don toshe rami, wanda aka sanya shi cikin nau'in allo, wanda aka sanya akan ramin bugu na na'ura, bayan kammala filin ajiye motoci na ramin toshe ba zai wuce mintuna 30 ba, tare da allon 36T. allo kai tsaye allo bugu hukumar surface juriya waldi, tsari tsari ne: pretreatment - toshe rami - allo bugu - pre yin burodi - daukan hotuna - ci gaba - curing
Tare da wannan tsari na iya tabbatar da cewa madaidaicin murfin murfin mai yana da kyau, toshe rami lebur, launin fim ɗin rigar daidai yake, matakin iska mai zafi zai iya tabbatar da cewa ramin gudanarwa ba tin ba, beads ba a ɓoye a cikin rami, amma sauƙin haifar kushin tawada a cikin rami bayan warkewa, yana haifar da ƙarancin solderability;Bayan daidaitawar iska mai zafi, gefen ramin ramin yana faɗuwa da mai.Yana da wuya a yi amfani da wannan tsari don sarrafawar samarwa, kuma yana da mahimmanci ga injiniyoyin sarrafawa su ɗauki matakai na musamman da sigogi don tabbatar da ingancin ramin toshe.
2.3 Aluminum toshe rami, ci gaban, precuring, nika farantin surface waldi.
Tare da CNC hakowa inji, hakowa da aluminum takardar da ake bukata toshe rami, sanya a cikin wani allo, shigar a kan matsawa allo bugu inji toshe rami, toshe rami dole ne a cika, biyu bangarorin na protruding ne mafi alhẽri, sa'an nan bayan curing, nika farantin surface. magani, tsarin shine: pretreatment - toshe rami a pre-bushewa - tasowa - pre-curing - surface walda.
Tunda maganin toshe rami a cikin wannan tsari na iya tabbatar da cewa mai baya fadowa ko fashe ta cikin ramin bayan HAL, amma kwano da aka boye a cikin ramin da kwano a ramin bayan HAL ba za a iya warware su gaba daya ba, don haka abokan ciniki da yawa ba sa karba.
2.4 Block waldi da toshe rami an kammala a lokaci guda.
Wannan hanyar tana amfani da allo na 36T (43T), shigar da injin bugu na allo, yin amfani da kushin ko gadon ƙusa, a cikin kammala allon a lokaci guda, duk ta hanyar toshe rami, tsarin shine: pretreatment - bugu na allo - kafin - bushewa - fallasa - haɓaka - warkewa.
Lokacin aiwatarwa gajere ne, babban amfani da kayan aiki, yana iya ba da garantin bayan rami fitar da mai, ramin matakin jagorar zafi mai zafi ba a kan tin ba, amma saboda amfani da bugu na allo don toshe rami, a cikin ƙwaƙwalwar rami tare da babban adadin iska, lokacin da curing, iska kumbura, to karya ta juriya waldi membrane, da ramuka, m, zafi iska matakin zai jagoranci rami ne kadan adadin da tin.
Lokacin aikawa: Nuwamba 16-2021