Typical Sn96.5Ag3.0Cu0.5 alloy yechinyakare lead-free reflow soldering tembiricha curve.A inzvimbo yekudziya, B ndiyo inogara tembiricha nzvimbo (nzvimbo yekunyorova), uye C inzvimbo inonyungudika.Mushure me260S ndiyo nzvimbo yekutonhora.
Sn96.5Ag3.0Cu0.5 alloy yechinyakare lead-isina reflow soldering tembiricha curve
Chinangwa chekudziya nzvimbo A ndechekukurumidza kupisa PCB board kune flux activation tembiricha.Tembiricha inokwira kubva patembiricha yemumba kusvika pa150°C mumasekonzi angangoita 45-60, uye kutenuka kunofanira kuva pakati pe1 ne3. Kana tembiricha ikakwira nekukasira, inogona kudhirika zvoita kuti pave nekuremara kwakadai sema solder bead uye bhiriji.
Kugara tembiricha zone B, tembiricha inokwira zvinyoro nyoro kubva pa150°C kusvika 190°C.Iyo nguva yakavakirwa pane chaiyo chigadzirwa zvinodiwa uye inodzorwa paanenge 60 kusvika 120 masekonzi kupa kutamba kwakazara kune chiitiko che flux solvent uye kubvisa oxides kubva kune welding pamusoro.Kana iyo nguva yakarebesa, kuwedzeredza activation kunogona kuitika, kukanganisa welding mhando.Panguva ino, mumiriri anoshanda mu flux solvent anotanga kushanda, uye rosin resin inotanga kupfava uye kuyerera.Iyo inoshanda mumiriri inoparadzanisa uye inopinda nerosin resin paPCB pad uye inosongedza magumo echikamu, uye inopindirana neyepamusoro oxide yepadhi uye chikamu che soldering surface.Kuita, kuchenesa nzvimbo kuti isungirwe uye kubvisa tsvina.Panguva imwecheteyo, rosin resin inokurumidza kuwedzera kuumba firimu rekudzivirira pamusoro pekunze kweiyo welding surface uye inoiparadzanisa kubva pakusangana nekunze gasi, kudzivirira iyo welding pamusoro kubva kune oxidation.Chinangwa chekuisa yakakwana yenguva yekupisa tembiricha nguva ndeyekubvumidza iyo PCB padhi uye zvikamu kuti zvisvike tembiricha imwechete isati yayerera solder uye kuderedza tembiricha mutsauko, nekuti kupisa kunyura kwezvikamu zvakasiyana zvakaiswa paPCB zvakasiyana kwazvo.Dzivirira matambudziko emhando anokonzerwa nekusaenzana kwekushisa panguva yekuyerera, sematombo eguva, manyepo ekutengesa, etc. Kana iyo inogara tembiricha zone ichipisa nekukurumidza, iyo flux mu solder paste inokurumidza kuwedzera uye kunyungudika, zvichikonzera matambudziko akasiyana emhando senge pores, kupeperetswa. tin, nemabhindauko emarata.Kana tembiricha yenguva dzose yakarebesa, iyo flux solvent inonyungudika zvakanyanya uye inorasikirwa nekuita kwayo uye basa rekudzivirira panguva yereflow soldering, zvichikonzera kutevedzana kwemhedzisiro yakaipa senge virtual soldering, yakasvibiswa solder joint residues, uye dull solder joints.Mukugadzirwa chaiko, iyo nguva yekupisa yenguva dzose inofanirwa kuiswa zvinoenderana nehunhu hwechigadzirwa chaicho uye lead-isina solder paste.
Nguva yakakodzera ye soldering zone C ndeye 30 kusvika 60 seconds.Yakapfupika nguva yekunyunguduka kwetini inogona kukonzera kukanganisa senge isina kusimba solder, nepo yakarebesa inogona kukonzera yakawandisa dielectric simbi kana kusviba majoini ekutengesa.Panguva ino, alloy powder mu solder paste inonyunguduka uye inopindirana nesimbi pane yakatengeswa.Iyo flux solvent inovira panguva ino uye inowedzera kuvhuvhuta uye kupinza, uye inokunda kushushikana kwepamusoro pakupisa kwakanyanya, ichibvumira iyo liquid alloy solder kuyerera nekuyerera, kupararira pamusoro pepedhi uye kuputira iyo inosongedzera yekupedzisira yechikamu kuti iumbe. a wetting effect.Tichifunga, iyo yakakwirira tembiricha, zviri nani kuita wetting.Nekudaro, mumashandisirwo anoshanda, iyo yakanyanya kushivirira tembiricha yePCB board uye zvikamu zvinofanirwa kutariswa.Kugadziriswa kwetembiricha uye nguva ye reflow soldering zone ndeye kutsvaga chiyero pakati pepamusoro tembiricha uye solder mhedzisiro, ndiko kuti, kuwana yakanakira solder mhando mukati meinogamuchirwa tembiricha uye nguva.
Mushure mewelding zone ndiyo inotonhora nzvimbo.Muchikamu chino, solder inotonhora kubva pamvura kusvika kune yakasimba kuti igadzire majoini anotengeswa, uye tsanga dzekristaro dzinoumbwa mukati memajoini ekutengesa.Kukurumidza kutonhora kunogona kugadzira majoini ekutengesa akavimbika ane gloss inopenya.Izvi zvinodaro nekuti kukurumidza kutonhora kunogona kuita iyo solder yekubatanidza iite alloy ine yakaomesesa chimiro, nepo inononoka kutonhora mwero inoburitsa yakawanda yeintermetal uye kuumba hombe tsanga panzvimbo yakabatana.Kuvimbika kwesimba remagetsi eiyo solder joint yakaderera, uye Iyo pamusoro peiyo solder joint ichave yakasviba uye yakaderera mu gloss.
Kuisa lead-isina reflow soldering tembiricha
Mune inotungamira-isina reflow solder process, iyo mhango yevira inofanirwa kugadziriswa kubva pachidimbu chese chesimbi simbi.Kana mhango yechoto ichigadzirwa nezvidimbu zvidiki zvesimbi, kuputika kwegomba rechoto kunozoitika nyore pasi petembiricha isina mutobvu.Izvo zvinonyanya kukosha kuyedza iyo track parallelism pane yakaderera tembiricha.Kana iyo track yakaremara pakupisa kwakanyanya nekuda kwezvinhu uye dhizaini, jamming uye kudonha kwebhodhi kuchave kusingadzivisike.Kare, Sn63Pb37 lead solder yaive yakajairika solder.MaCrystalline alloys ane nzvimbo imwechete yekunyungudika uye tembiricha yechando, zvese zviri 183°C.Iyo inotungamira-isina solder yekubatanidza yeSnAgCu haisi eutectic alloy.Kunyungudika kwayo kunosvika 217°C-221°C.Tembiricha yakasimba kana tembiricha yakadzikira kupfuura 217°C, uye tembiricha iine mvura kana tembiricha iri pamusoro pe221°C.Kana tembiricha iri pakati pe217°C uye 221°C Iyo alloy inoratidza mamiriro asina kugadzikana.
Nguva yekutumira: Nov-27-2023