PCB Rework Tips ekupheleni SMT PCBA

PCB Rework

 

Emva kokuba uhlolo lwe-PCBA lugqityiwe, i-PCBA eneziphene kufuneka ilungiswe.Inkampani ineendlela ezimbini zokulungisa iSMT PCBA.

Omnye kukusebenzisa i-iron ye-solder yeqondo lokushisa rhoqo (i-welding manual) yokulungiswa, kwaye enye kukusebenzisa i-workbench yokulungisa (i-welding air eshushu) ukulungiswa.Kungakhathaliseki ukuba yeyiphi indlela eyamkelweyo, kuyafuneka ukuba wenze i-solder edibeneyo ngexesha elifutshane.

Ngoko ke, xa usebenzisa i-iron soldering, kufuneka ugcwalise indawo ye-soldering ngaphantsi kwemizuzwana emi-3, ngokukodwa malunga nemizuzwana emi-2.

I-diameter ye-solder wire ifuna ukubeka phambili ukusebenzisa i-diameter φ0.8mm, okanye usebenzise i-φ1.0mm, hayi φ1.2mm.

Ukuseta iqondo lobushushu bentsimbi: ucingo oluqhelekileyo lwe-welding ukuya kwi-380 gear, i-welding wire ye-welding ephezulu ukuya kwi-420 gear.

Indlela ye-Ferrochrome yokuphinda isebenze i-welding manual

1. Ukunyangwa kwentsimbi entsha yokugoqa phambi kokusetyenziswa:

Intsimbi entsha ye-solder ingasetyenziselwa ngokuqhelekileyo emva kokuba intsimbi ye-soldering ifakwe kwi-solder ngaphambi kokusetyenziswa.Xa i-iron soldering isetyenziselwa ixesha elithile, i-oxide layer iya kwenziwa kwaye ijikeleze i-blade surface ye-soldering iron tip, eya kubangela ubunzima "kwi-tin yokutya".Ngeli xesha, i-oxide layer ingafakwa, kwaye i-solder ingaphinda ifakwe.

 

2. Uyibamba njani intsimbi yokuthambisa:

Ukubamba umva: Sebenzisa iminwe emihlanu ukubamba umqheba wentsimbi entendeni yesandla sakho.Le ndlela ifanelekile kumandla aphezulu ombane we-soldering irons ukuze udibanise iindawo ezinokushisa okukhulu.

I-Ortho-grip: Bamba umqheba wentsimbi yokugoqa ngeminwe emine ngaphandle kwesithupha, kwaye ucinezele ubhontsi kwicala lentsimbi.Intsimbi yokudambisa esetyenziswa kule ndlela nayo inkulu ngokwentelekiso, kwaye uninzi lwayo ngamacangca entsimbi egobileyo.

Indlela yokubamba ipeni: ukubamba intsimbi yombane, njengokubamba ipeni, ifanelekile kwiintsimbi zombane eziphantsi kwamandla aphantsi ukuze zidibanise iinxalenye ezincinci ukuba zidityaniswe.

 

3. Amanyathelo okuwelda:

Ngethuba lenkqubo ye-welding, izixhobo kufuneka zibekwe ngokufanelekileyo, kwaye intsimbi ye-soldering yombane kufuneka ihambelane ngokuqinileyo.Ngokuqhelekileyo, kungcono ukusebenzisa i-tube-shaped solder wire kunye ne-rosin ukwenzela i-soldering.Bamba intsimbi yokujongisa ngesinye isandla kunye nocingo lwesolder ngesinye.

Coca incam yentsimbi yokujongisa Fudumeza indawo yokujongisa.

① Khawuleza uchukumise incam yentsimbi eshushu kunye nenkonkxiweyo kucingo olunabileyo, emva koko uchukumise indawo edityanisiweyo, sebenzisa i-solder etyhidiweyo ukunceda ubushushu bokuqala ukusuka kwintsimbi yokuthambisa ukuya kwindawo yokusebenza, kwaye emva koko uhambise ucingo lwesolder kude ukuze uqhagamshelane i-soldering Umphezulu wencam yentsimbi.

②Qhagamshelana nencam yentsimbi kwiphini/iphedi, kwaye ubeke ucingo lokujongisa phakathi kwencam yentsimbi kunye nephini ukuze wenze ibhulorho eshushu;ke ngokukhawuleza uhambise ucingo lwe-solder ukuya kwelinye icala lendawo ye-soldering.

Nangona kunjalo, ngokuqhelekileyo kubangelwa ukushisa okungafanelekanga, uxinzelelo olugqithisileyo, ixesha lokugcina elongezelelweyo, okanye umonakalo kwi-PCB okanye amacandelo abangelwa ngabathathu kunye.

 

4. Amanyathelo okuthintela ukuwelda:

Iqondo lokushisa kwincam yentsimbi ye-solder kufuneka ifaneleke.Iingcebiso ezahlukeneyo zobushushu bentsimbi ziya kuvelisa izinto ezahlukeneyo xa zibekwe kwibhloko yerosin.Ngokuqhelekileyo, iqondo lokushisa xa i-rosin inyibilika ngokukhawuleza kwaye ingakhuphi umsi ifanelekile ngakumbi.

Ixesha le-solder kufuneka lifaneleke, ukusuka ekufudumeni i-solder joint to solder melting kunye nokuzalisa i-solder joint, ngokuqhelekileyo kufuneka igqitywe kwimizuzwana embalwa.Ukuba ixesha le-solder lide kakhulu, i-flux kwi-solder joints iya kuguqa ngokupheleleyo, kwaye umphumo wokugungqa uya kulahleka.

Ukuba ixesha le-solder lifutshane kakhulu, iqondo lokushisa lendawo ye-solder aliyi kufikelela kwiqondo lokushisa, kwaye i-solder ayiyi kunyibilika ngokwaneleyo, eya kubangela ukuba lula ukubethelwa kobuxoki.

Ubungakanani be-solder kunye ne-flux kufuneka isetyenziswe ngokufanelekileyo.Ngokuqhelekileyo, ukusetyenziswa kwe-solder eninzi okanye encinci kakhulu kunye ne-flux kwi-joint solder iya kuba nefuthe elikhulu kumgangatho we-solder.

Ukuthintela i-solder kwi-joint ye-solder ukuba ihambe ngokungaqhelekanga, i-solder efanelekileyo kufuneka ibe kukuba i-solder ithengiswa kuphela apho idinga ukuthengiswa.Kwi-soldering operation, i-solder kufuneka ibe ngaphantsi ekuqaleni.Xa i-solder point ifikelela kubushushu be-soldering kwaye i-solder igeleza kwi-gap ye-solder point, i-solder iya kuzaliswa kwakhona ukugqiba i-soldering ngokukhawuleza.

Musa ukuthintela amajoyina e-solder ngexesha lenkqubo ye-soldering.Xa i-solder kwi-solder joints ingaqini ngokupheleleyo, izixhobo ezithengiswayo kunye neengcingo kwiindawo ze-solder akufanele zihanjiswe, ngaphandle koko i-solder joints iya kuba yinto ephosakeleyo kwaye i-welding ebonakalayo iya kwenzeka.

Musa ukutshisa amacandelo ajikelezileyo kunye neengcingo.Xa i-soldering, qaphela ukuba ungatshisi i-plastic insulation layer yeengcingo ezijikelezileyo kunye nomphezulu wamacandelo, ngakumbi kwiimveliso ezinezakhiwo ezidibeneyo kunye neemilo ezinzima.

Yenza umsebenzi wokucoca emva kwe-welding ngexesha.Emva kokuba i-welding igqityiwe, intloko yocingo olusikiweyo kunye ne-tin slag yehla ngexesha le-welding kufuneka isuswe ngexesha lokukhusela iingozi ezifihliweyo ekuweleni kwimveliso.

 

5. Unyango emva kwe-welding:

Emva kwe-welding, kufuneka ukhangele:

Nokuba akukho solder.

Ngaba igloss ye-solder joints ilungile?

I-solder joint ayinelanga.

Nokuba kukho ukuguquguquka okushiyekileyo okujikeleze amalungu e-solder.

Ingaba kukho i-welding eqhubekayo.

Ingaba i-pad iwile.

Ingaba kukho iintanda kwi-solder joints.

Ngaba i-solder joint ayilingani?

Ingaba i-solder joints ibukhali.

Tsala icandelo ngalinye kunye ne-tweezers ukubona ukuba kukho ukukhululeka.

 

6. Ukuchithwa:

Xa intsimbi ye-soldering itshiswe yi-desoldering point, ngokukhawuleza ukuba i-solder iyancibilika, i-lead yecandelo kufuneka ikhutshwe kwi-direction perpendicular kwibhodi yesiphaluka ngexesha.Kungakhathaliseki ukuba indawo yokufakela icandelo, nokuba kulula ukuyikhupha, unganyanzeli okanye ujike icandelo.Ukuze ungonakalisi ibhodi yesiphaluka kunye namanye amacandelo.

Musa ukusebenzisa amandla agqithisileyo xa uchitha.Umkhuba wokukhangela kunye nokugungqa uqhagamshelwano ngentsimbi yokuthambisa yombane imbi kakhulu.Ngokuqhelekileyo, umnxibelelwano akavumelekanga ukuba asuswe ngokutsala, ukuxubha, ukujija, njl.

Ngaphambi kokufaka inxalenye entsha, i-solder kwi-pad wire hole kufuneka ihlambuluke, ngaphandle koko i-pad yebhodi yesekethe iya kuphazamiseka xa ifaka i-lead yecandelo elitsha.