UBURYO BUKURIKIRA

Kugurisha ibicuruzwa nuburyo bukoreshwa cyane muguhuza ibice byubuso bwibibaho ku mbaho ​​zacapwe (PCBs).Intego yibikorwa ni ugushiraho ingingo zemewe zemewe kubanza kubanza gushyushya ibice / PCB / kugurisha hanyuma ugashonga uwagurishije bitarinze kwangiza ubushyuhe bwinshi.

Ibintu by'ingenzi biganisha ku kugurisha neza uburyo bwo kugurisha ni ibi bikurikira:

1. Imashini ibereye
2. Umwirondoro wemewe
3. Igishushanyo mbonera cya PCB / ibice
4. Witonze wanditse PCB ukoresheje stencil yateguwe neza
5. Gusubiramo inshuro nyinshi ibice byubuso
6. PCB nziza nziza, ibice hamwe na paste yo kugurisha

Imashini ibereye

Hariho ubwoko butandukanye bwimashini igurisha iboneka bitewe numuvuduko ukenewe wumurongo nigishushanyo / ibikoresho byinteko za PCB bigomba gutunganywa.Ifuru yatoranijwe igomba kuba ifite ubunini bukwiye kugirango igabanye umusaruro wibikoresho byo gutoranya no gushyira ibikoresho.

Umuvuduko wumurongo urashobora kubarwa nkuko bigaragara hano: -

Umuvuduko wumurongo (ntarengwa) =Ikibaho kumunota x Uburebure kuri buri kibaho
Ibintu biremereye (umwanya uri hagati yimbaho)

Ni ngombwa gusuzuma isubiramo ryibikorwa bityo 'Load Factor' isanzwe igaragazwa nuwakoze imashini, kubara byerekanwe hepfo:

Kugirango ubashe guhitamo ingano yukuri yerekana ifuru umuvuduko wibikorwa (bisobanuwe hepfo) bigomba kuba birenze umuvuduko muto wabazwe.

Umuvuduko wibikorwa =Icyumba cy'itanura gishyushye
Inzira yo gutura

Hasi nurugero rwo kubara kugirango umenye ingano yitanura: -

Inteko ya SMT irashaka gukora imbaho ​​za santimetero 8 ku gipimo cya 180 ku isaha.Ugurisha paste uruganda rusaba iminota 4, imyirondoro itatu.Nkeneye itanura kugeza ryari nkeneye gutunganya imbaho ​​kuriyi nyungu?

Ikibaho kumunota = 3 (180 / isaha)
Uburebure kuri buri kibaho = santimetero 8
Ibintu biremereye = 0.8 (umwanya wa santimetero 2 hagati yimbaho)
Inzira yo Gutura Igihe = iminota 4

Kubara Umuvuduko Wumurongo:(Ikibaho 3 / min) x (santimetero 8 / ikibaho)
0.8

Umuvuduko wumurongo = santimetero 30 / umunota

Kubwibyo, itanura ryerekana rigomba kugira umuvuduko wibikorwa byibura santimetero 30 kumunota.

Menya icyumba cya hoteri gishyushye uburebure hamwe no kugereranya umuvuduko:

30 muri / min =Icyumba cy'itanura gishyushye
Iminota 4

Ifuru ishyushye uburebure = santimetero 120 (metero 10)

Menya ko uburebure rusange bw'itanura buzarenga metero 10 harimo igice cyo gukonjesha hamwe n'ibice byo gupakira.Kubara ni kubushyuhe BUSHYUSHYE - NTIBISANZWE CYANE.

2. Gufunga loop ifunga umuvuduko wabafana ba convection - Hariho uduce tumwe na tumwe twa sisitemu yo hejuru nka SOD323 (reba shyiramo) ifite agace gato gahuza abantu ku kigereranyo rusange gishobora guhungabana mugihe cyo kugaruka.Gufunga umuvuduko wo kugenzura abafana b'ikoraniro ni amahitamo asabwa guterana ukoresheje ibice nkibi.

3. Igenzura ryikora rya convoyeur hamwe na centre-yubuyobozi-bushyigikire ubugari - Imashini zimwe zifite ubugari bwintoki ariko niba hari inteko nyinshi zitandukanye zigomba gutunganywa nubugari butandukanye bwa PCB noneho ubu buryo burasabwa gukomeza inzira ihamye.

Umwirondoro wemewe

Kugirango ushireho umwirondoro wa thermocouples ihujwe ninteko ntangarugero (mubisanzwe hamwe nu ugurisha ubushyuhe bwo hejuru) ahantu henshi kugirango bapime urugero rwubushyuhe muri PCB.Birasabwa kugira byibuze thermocouple imwe iri kuri padi yerekeza kumpera ya PCB hamwe na thermocouple imwe iri kuri padi yerekeza hagati ya PCB.Byiza cyane thermocouples igomba gukoreshwa mugupima ubushyuhe bwuzuye muri PCB - izwi nka 'Delta T'.

Muburyo busanzwe bwo kugurisha umwirondoro harimo ibyiciro bine - Shyushya, ushire, ugaragaze kandi ukonje.Intego nyamukuru nukwimura ubushyuhe buhagije mumateraniro kugirango ushongeshe uwagurishije kandi agire ingingo zigurisha nta kwangiza ibice cyangwa PCB.

Shyushya- Muri iki cyiciro ibice, PCB nuwagurishije byose bishyushya ubushyuhe bwihariye cyangwa gutura ahantu witonde kugirango udashyuha vuba (mubisanzwe ntibirenza 2ºC / isegonda - reba paste datasheet).Gushyushya vuba birashobora gutera inenge nkibigize gucika hamwe na paste yuwagurishije gutemba bigatuma imipira yabagurisha mugihe cyo kugaruka.

Wibike- Intego y'iki cyiciro ni ukureba ko ibice byose bigera ku bushyuhe bukenewe mbere yo kwinjira mu cyiciro.Kwibika mubisanzwe bimara amasegonda 60 na 120 bitewe n '' itandukaniro rusange 'ryinteko nubwoko bwibigize bihari.Nuburyo bwiza bwo kohereza ubushyuhe mugihe cya soak igihe gito kirakenewe.

Niba umwirondoro wo gusubiramo ufite ubushyuhe budahagije bwakoreshejwe mugihe cyo kugaruka hazabaho kugurisha ibicuruzwa bigaragara nkibishusho bikurikira: -

ugurisha ntabwo yashizeho fillet hamwe na gurş

Imipira yabagurisha yose ntabwo yashonga

Inenge isanzwe yo kugurisha nyuma yo kugaruka ni ugukora imipira yo hagati yo kugurisha imipira / amasaro nkuko bigaragara hano hepfo.Igisubizo kuri iyi nenge ni uguhindura igishushanyo mbonera -ibisobanuro birambuye murashobora kubibona hano.

Imikoreshereze ya azote mugihe cyo kugaruka igomba gutekerezwa bitewe nuburyo bwo kuva kure ya pasteur irimo ibicuruzwa bikomeye.Ikibazo mubyukuri ntabwo ari ubushobozi bwo kugaruka muri azote, ahubwo ni ubushobozi bwo kwigaragaza mugihe ogisijeni idahari.Gushyushya ugurisha imbere ya ogisijeni bizana okiside, ubusanzwe ntibishobora kugurishwa.

Gukonja- Uru ni urwego gusa inteko ikonjesha ariko ni ngombwa kudakonjesha inteko vuba - mubisanzwe igipimo gisabwa cyo gukonjesha ntigishobora kurenga 3ºC / isegonda.

Igishushanyo cya PCB / Ibigize Ibirenge

Hariho ibintu byinshi byubushakashatsi bwa PCB bigira ingaruka kuburyo inteko izagaruka neza.Urugero ni ubunini bwinzira zihuza ikirenge - niba inzira ihuza uruhande rumwe rwikirenge cyibintu binini kuruta urundi ibi birashobora gutuma habaho ubusumbane bwumuriro butera igice 'ibuye ryimva' nkuko bigaragara hano hepfo: -

Urundi rugero ni 'kuringaniza umuringa' - ibishushanyo byinshi bya PCB bifashisha ahantu hanini h'umuringa kandi iyo pcb ishyizwe mumwanya wo gufasha mubikorwa byo gukora birashobora gutuma habaho ubusumbane bwumuringa.Ibi birashobora gutuma akanama kanyeganyega mugihe cyo kugaruka bityo igisubizo gisabwa nukwongeramo 'kuringaniza umuringa' mumyanda yimyanya yabantu nkuko bigaragara hano: -

Reba'Igishushanyo mbonera'kubindi bitekerezo.

Witonze wanditse PCB ukoresheje stencil yateguwe neza

Intambwe yambere yintambwe murwego rwo guterana hejuru ningirakamaro muburyo bwiza bwo kugurisha.Uwitekakugurisha paste yo gucapani urufunguzo rwo kwemeza kubitsa byimazeyo kugurisha kuri PCB.Ikosa iryo ari ryo ryose kuri iki cyiciro rizaganisha ku bisubizo bitifuzwa bityo rero kugenzura neza iki gikorwa hamweIgishushanyo mbonerani ngombwa.

Gusubiramo inshuro nyinshi ibice byubuso

Gutandukanya ibice bitandukanye

Gushyira ibice byubuso bigomba gusubirwamo bityo rero kwizerwa, kubungabungwa neza no gufata imashini birakenewe.Niba ibice bigize ibice bitigishijwe muburyo bukwiye birashobora gutuma imashini iyerekwa sisitemu itabona buri gice muburyo bumwe bityo rero gutandukana mubyerekanwe bizagaragara.Ibi bizaganisha kubisubizo bidahuye nyuma yo kugurisha ibintu.

Porogaramu yo gushyira ibice irashobora gushirwaho ukoresheje imashini zitoranya kandi zigashyira ariko iyi nzira ntabwo arukuri nko gufata amakuru ya centroid uhereye kumakuru ya PCB Gerber.Kenshi na kenshi aya makuru ya centroid yoherezwa muri software ya PCB yo gushushanya ariko harigihe ntaboneka bityo reroserivisi yo kubyara centroid ya dosiye kuva Gerber itangwa na Surface Mount Process.

Imashini zose zimashini zizaba zifite 'Ahantu ho Gushyira' hasobanuwe nka: -

35um (QFPs) kugeza 60um (chips) @ 3 sigma

Ni ngombwa kandi ko nozzle ikwiye yatoranijwe kugirango ubwoko bwibigize bushyirwe - urutonde rwibintu bitandukanye byashyizwe mu majwi murashobora kubibona hepfo: -

PCB nziza nziza, ibice hamwe na paste yo kugurisha

Ubwiza bwibintu byose byakoreshejwe mugihe cyibikorwa bigomba kuba biri hejuru kuko ikintu cyose cyubuziranenge kizaganisha kubisubizo bitifuzwa.Ukurikije uburyo bwo gukora bwa PCB nuburyo zabitswe kurangiza PCB birashobora gutuma umuntu adacumura nabi mugihe cyo kugurisha ibintu.Hasi ni urugero rwibishobora kugaragara mugihe ubuso burangiye kuri PCB bukennye buganisha ku nenge izwi nka 'Black Pad': -

UMUNTU WIZA PCB FINISH

PCB YATANZWE

Igurisha ritemba mubice ntabwo ari PCB

Muburyo busa ubwiza bwibintu byo hejuru yubuso buyobora birashobora kuba bibi bitewe nuburyo bwo gukora nuburyo bwo kubika.

Ubwiza bwumugurisha paste bugira ingaruka cyane kurikubika no gutunganya.Ibicuruzwa byiza byo kugurisha paste iyo bikoreshejwe birashoboka gutanga ibisubizo nkuko bigaragara hano: -