PCB Rework Mazano mukupera kweSMT PCBA

PCB Rework

 

Mushure mekuongororwa kwePCBA kwapera, iyo PCBA yakaremara inoda kugadziriswa.Iyo kambani ine nzira mbiri dzekugadzirisa iyoSMT PCBA.

Imwe ndeyokushandisa nguva dzose tembiricha soldering iron (manual welding) yekugadzirisa, uye imwe ndeyokushandisa kugadzirisa workbench (hot air welding) kugadzirisa.Hazvina mhosva kuti ndeipi nzira inogamuchirwa, inotarisirwa kuumba yakanaka solder joint munguva pfupi.

Naizvozvo, kana uchishandisa simbi yekunyungudutsa, inodiwa kuti upedze iyo solder poindi isingasviki 3 masekonzi, zviri nani anenge 2 masekonzi.

Iyo dhayamita yewaya yekutengesa inoda kukoshesa kushandisa dhayamita φ0.8mm, kana kushandisa φ1.0mm, kwete φ1.2mm.

Soldering simbi tembiricha kugadzika: yakajairika welding waya kusvika 380 giya, yakakwirira tembiricha welding waya kusvika 420 giya.

Ferrochrome rework nzira ndeye manual welding

1. Kurapwa kwesimbi itsva yesimbi isati yashandiswa:

Iyo itsva solder iron inogona kushandiswa zvakajairwa mushure mekunge solder iron tip yakaputirwa nedhizaini ye solder isati yashandiswa.Kana iyo solder iron ikashandiswa kwenguva yakati rebei, iyo oxide layer ichaumbwa pamusoro uye yakatenderedza blade pamusoro peiyo solder iron tip, izvo zvinokonzeresa kuoma mu "kudya tini".Panguva ino, iyo oxide layer inogona kuiswa, uye solder inogona kuiswa zvakare.

 

2. Mabatiro esimbi yekusimbisa:

Reverse grip: Shandisa zvigunwe zvishanu kubata mubato wesimbi yekunyungudutsa muchanza chako.Iyi nzira yakakodzera kune yakakwirira-simba magetsi ekuisa simbi kuti weld zvikamu zvine hombe kupisa disipation.

Ortho-grip: Bata mubato wesimbi yakanyungudutswa neminwe mina kunze kwechigunwe, wodzvanya chigunwe uchitevedza nzira yesimbi yekunyungudutsa.Simbi yekusimbisa inoshandiswa nenzira iyi zvakare yakakura, uye mazhinji acho imatipi esimbi akakomberedzwa.

Peni yekubata nzira: kubata simbi yemagetsi soldering, sekubata peni, yakakodzera kune yakaderera-simba simbi yemagetsi solder iron to weld zvidimbu zvidiki kuti zvipinze.

 

3. Welding matanho:

Munguva yekugadzira simbi, zvishandiso zvinofanira kuiswa zvakanaka, uye simbi yemagetsi inosungirirwa inofanira kunyatsoenderana.Kazhinji, zviri nani kushandisa chubhu-yakaita solder waya ine rosin ye soldering.Bata simbi yekunyungudutsa kune rumwe ruoko uye waya ye solder kune rumwe.

Chenesa simbi inonyungudutsa Piya panoungirwa Nyungudusa solder. Bvisa simbi inopinza

① Kurumidza kubata simbi yakadziya uye yakasungirirwa simbi kune cored waya, wobva wabata iyo solder yakabatana nzvimbo, shandisa yakanyungudutswa solder kubatsira kutanga kupisa kwekutanga kubva musimbi inotengeswa kuenda kune yekushanda, uye wobva wafambisa waya yekutengesa kure kuti ubate iyo. soldering Nzvimbo yepamusoro yesimbi yakasungwa tip.

②Bata simbi inopinza papini/pedhi, woisa waya yekusongedzera pakati pesimbi inosungwa nepini kuti iite zambuko rinopisa;wobva wakurumidza kufambisa waya wesolder kune rumwe rutivi rwenzvimbo yesolder.

Zvisinei, inowanzokonzerwa nekushisa kusina kunaka, kunyanya kudzvinyirira, nguva yekuchengetedza yakawedzerwa, kana kukanganisa kuPCB kana zvikamu zvinokonzerwa nevatatu pamwe chete.

 

4. Chengetedzo yewelding:

Kupisa kwesimbi yesimbi yesimbi kunofanira kunge kwakakodzera.Yakasiyana tembiricha yekushongedza simbi matipi inoburitsa akasiyana zviitiko kana yaiswa pane rosin block.Kazhinji, tembiricha kana rosin inonyungudika nekukurumidza uye isingabudise utsi ndiyo yakakodzera.

Nguva yekunyungudutsa inofanira kunge yakakodzera, kubva pakupisa mubatanidzwa we solder kusvika pakunyunguduka uye kuzadza iyo solder joint, kazhinji inofanira kupera mukati memasekondi mashoma.Kana iyo solder nguva yakarebesa, iyo inoyerera pamajoini e solder inoshanduka zvachose, uye mhedzisiro inorasika.

Kana iyo solder nguva ipfupi, kutonhora kweiyo solder hakuzosviki kutonhora kwekutengesa, uye solder haizonyungudika zvakakwana, izvo zvinozoita nyore kukonzera manyepo.

Nhamba ye solder uye flux inofanira kushandiswa zvakakodzera.Kazhinji, kushandisa yakawandisa kana kushoma solder uye flux pane solder joint ichava nerubatsiro rwakakura pamhando ye soldering.

Kuti udzivise kuti solder iri pajoint ye solder irege kufamba zvisina tsarukano, yakanakira solder inofanira kunge iri yekuti solder inongotengeswa painoda kutengeswa.Mukushanda kwekutengesa, solder inofanira kuva shoma pakutanga.Apo iyo solder inosvika pakupisa kwekutengesa uye solder inopinda mukati memukana wekutengesa nzvimbo, iyo solder inozadzwa zvakare kuti ipedze kutengesa nokukurumidza.

Usabata majoini e solder panguva yekugadzira.Kana iyo solder pamajoini emasoja isati yanyatso kuomeswa, iyo solder midziyo uye waya pamajoini e solder haifanirwe kufambiswa, kana zvikasadaro majoini ekutengesa achave akaremara uye virtual welding ichaitika.

Usapisa zvinhu zvakapoteredza uye waya.Paunenge uchitengesa, chenjerera kuti usapisa mupendero wepurasitiki wewaya dzakatenderedza uye nepamusoro pezvikamu, kunyanya kune zvigadzirwa zvine compact welding zvimiro uye maumbirwo akaomarara.

Ita basa rekuchenesa mushure mekucheka munguva.Mushure mekugadzirisa kwapera, musoro wewaya wakachekwa uye tin slag yakadonhedzwa panguva yekushongedza inofanira kubviswa nenguva kudzivirira njodzi dzakavanzika kubva pakuwira muchigadzirwa.

 

5. Kurapa mushure mekuputika:

Mushure mekugadzira, iwe unofanirwa kutarisa:

Kana pasina solder.

Ko kupenya kwemajoini emasoja kwakanaka here?

Solder joint haina kukwana.

Kunyangwe paine yakasara flux yakatenderedza majoini ekutengesa.

Kana paine continuous welding.

Kana pad yadonha.

Ingave kune mitswe mumajoini ekutengesa.

Iyo solder joint haina kuenzana here?

Kana majoini ekutengesa akapinza.

Dhonza chikamu chimwe nechimwe chine ma tweezers kuti uone kana paine kusununguka.

 

6. Desoldering:

Kana iyo solder iron tip ichipisa nenzvimbo yekuparara, kana solder yanyungudika, kutungamira kwechikamu kunofanira kudhonzwa munzira yakatarisana nebhodhi redunhu munguva.Pasinei nechinzvimbo chekuisa chechikamu, kana zviri nyore kutora kunze, usamanikidza kana kumonyanisa chikamu.Kuti urege kukuvadza bhodhi redunhu uye zvimwe zvikamu.

Usashandise simba rakawandisa paunenge uchibvisa.Muitiro wekutsvaga uye kuzunungusa kusangana nesimbi yemagetsi yakasvibiswa yakashata zvikuru.Kazhinji, kubata hakubvumidzwe kubviswa nekudhonza, kuzunza, kumonyorora, nezvimwe.

Usati waisa chikamu chitsva, solder mugomba repadhi yewaya inofanira kucheneswa, zvikasadaro padhi yebhodhi redunhu ichave yakamonyoroka kana ichiisa kutungamira kwechikamu chitsva.