Kwi-PCBA processing, umgangatho we-welding webhodi yesiphaluka unempembelelo enkulu ekusebenzeni kunye nokubonakala kwebhodi yesekethe.Ngoko ke, kubaluleke kakhulu ukulawula umgangatho welding webhodi yesekethe PCB.PCB ibhodi yeseketheumgangatho welding inxulumene ngokusondeleyo kuyilo ibhodi yesekethe, izinto inkqubo, iteknoloji welding kunye nezinye izinto.
一、 Uyilo lwebhodi yesekethe yePCB
1. Uyilo lwePad
(1) Xa uyila iipads zamacandelo eplagi, ubungakanani bepadi kufuneka buyilwe ngokufanelekileyo.Ukuba i-pad inkulu kakhulu, indawo yokusabalalisa i-solder inkulu, kwaye i-solder joints eyakhiweyo ayigcwele.Ngakolunye uhlangothi, ukunyanzeliswa komphezulu wefoyile yobhedu yephedi encinci incinci kakhulu, kwaye i-solder joints eyenziwa yi-non-wetting solder joints.Umsantsa ohambelanayo phakathi kwe-aperture kunye necandelo elikhokelela likhulu kakhulu kwaye kulula ukubangela i-soldering yobuxoki.Xa i-aperture i-0.05 - 0.2mm ububanzi ngaphezu kwe-lead kunye ne-pad ye-pad i-2 - 2.5 amaxesha okungena, yimeko efanelekileyo yokudibanisa.
(2) Xa uyila iipads zamacandelo e-chip, la manqaku alandelayo kufuneka athathelwe ingqalelo: Ukuze kupheliswe "impembelelo yesithunzi" kangangoko kunokwenzeka, iitheminali ze-soldering okanye izikhonkwane ze-SMD kufuneka zijongane necala lokuhamba kwe-tin ukuququzelela. ukudibana nokuhamba kwetoti.Nciphisa i-solder yobuxoki kunye ne-solder engekhoyo.Amacandelo amancinci akufanele abekwe emva kwamacandelo amakhulu ukukhusela amacandelo amakhulu ekuphazamiseni ukuhamba kwe-solder kunye nokuqhagamshelana neepads zamacandelo amancinci, okubangelwa ukuvuza kwe-soldering.
2, ibhodi yesekethe PCB ulawulo flatness
I-Wave soldering ineemfuno eziphezulu kwi-flatness yeebhodi eziprintiweyo.Ngokubanzi, iphepha lokulwa liyafuneka ukuba libe ngaphantsi kwe-0.5mm.Ukuba ingaphezulu kwe-0.5mm, kufuneka ithotywe.Ngokukodwa, ubukhulu bezinye iibhodi eziprintiweyo zimalunga ne-1.5mm kuphela, kwaye iimfuno zabo ze-warpage ziphezulu.Ngaphandle koko, umgangatho we-welding awunakuqinisekiswa.Le miba ilandelayo kufuneka ithathelwe ingqalelo:
(1) Gcina ngokufanelekileyo iibhodi eziprintiweyo kunye namacandelo kwaye unciphise ixesha lokugcina kangangoko kunokwenzeka.Ngexesha le-welding, i-foil yobhedu kunye necandelo elikhokelela ngaphandle kothuli, igrisi, kunye nee-oxides zilungele ukubunjwa kwamalungu afanelekileyo e-solder.Ngoko ke, iibhodi eziprintiweyo kunye namacandelo kufuneka agcinwe kwindawo eyomileyo., kwindawo ecocekileyo, kwaye unciphise ixesha lokugcina kangangoko kunokwenzeka.
(2) Kwiibhodi eziprintiweyo ezibekwe ixesha elide, umgangatho kufuneka ucocwe ngokubanzi.Oku kunokuphucula i-solderability kunye nokunciphisa i-soldering yobuxoki kunye nokudibanisa.Kwizikhonkwane zecandelo kunye neqondo elithile le-oxidation yomhlaba, umphezulu kufuneka ususwe kuqala.umaleko oxide.
二.Ukulawulwa komgangatho wezixhobo zenkqubo
Kwi-soldering ye-wave, eyona nto isetyenziswayo yinkqubo yezinto: i-flux kunye ne-solder.
1. Ukusetyenziswa kwe-flux kunokususa i-oxides kwi-welding surface, ukukhusela ukuphinda kufakwe i-oxidation ye-solder kunye ne-welding surface ngexesha le-welding, ukunciphisa ukunyanzeliswa komphezulu we-solder, kunye nokunceda ukudlulisa ukushisa kwindawo yokudibanisa.I-Flux idlala indima ebalulekileyo ekulawuleni umgangatho we-welding.
2. Ukulawulwa komgangatho we-solder
I-solder ye-tin-lead iyaqhubeka i-oxidize kumaqondo obushushu aphezulu (250 ° C), ibangela ukuba umxholo wetoti we-tin-lead solder kwi-tin-lead solder kwi-tin-lead solder iyancipha ngokuqhubekayo kwaye iphambuke kwindawo ye-eutectic, kubangele ukungahambi kakuhle kwamanzi kunye neengxaki ezisemgangathweni ezifana nokuqhubekayo. i-soldering, i-solder engenanto, kunye nokungonelanga kwamandla adibeneyo e-solder..
三、Ulawulo lweparamitha yenkqubo yeWelding
Impembelelo yenkqubo ye-welding parameters kwi-welding surface quality inzima kakhulu.
Kukho iingongoma eziphambili ezininzi: 1. Ukulawulwa kokushisa kwangaphambili.2. Welding track inclination angle.3. Ukuphakama kwe-Wave crest.4. Ubushushu be-welding.
Ukuwelda linyathelo lenkqubo ebalulekileyo kwinkqubo yokuvelisa ibhodi yesekethe PCB.Ukuze kuqinisekiswe umgangatho we-welding webhodi yesiphaluka, umntu kufuneka abe nobuchule kwiindlela zokulawula umgangatho kunye nezakhono ze-welding.
