Thereflow oveninoshandiswa kutengesa iyo SMT chip zvikamu kune redunhu bhodhi muSMT process solder yekugadzira michina.Ovheni inoyerera inovimba nekuyerera kwemhepo inopisa muchoto kukwesha solder paste pamajoini e solder paste redunhu bhodhi, kuitira kuti solder paste inyungudiswe zvakare kuita mvura tini kuitira kuti SMT chip zvikamu uye bhodhi redunhu. zvinosungirirwa uye zvakasungirirwa, uye zvino reflow soldering Icho choto chinotonhodzwa kuti chigadzire majoini ekutengesa, uye colloidal solder paste inopinda maitiro emuviri pasi peimwe tembiricha yepamusoro yemhepo kuti iwane soldering yeSMT process.
Iyo solder muhovheni inoyerera yakakamurwa kuita mana maitiro.Mabhodhi edunhu ane smt components anotakurwa kuburikidza nereflow oven gwara renzira kuburikidza nenzvimbo yekupisa, nzvimbo yekuchengetedza kupisa, solder zone, uye inotonhorera nzvimbo yeovheni inoyerera zvichiteerana, uyezve mushure mekushambadzira solder.Iwo mana tembiricha nzvimbo dzechoto zvinoumba yakakwana welding point.Tevere, Guangshengde reflow soldering inotsanangura misimboti yenzvimbo ina tembiricha yehovhoni inoyerera zvichiteerana.
Preheating ndeye kumisa solder paste, uye kudzivirira kukurumidza kupisa kwekushisa kwepamusoro panguva yekunyudzwa kwetin, inova chiito chekupisa chinoitwa kukonzera mativi akaremara.Chinangwa chenzvimbo iyi kupisa PCB patembiricha yekamuri nekukurumidza, asi mwero wekupisa unofanirwa kudzorwa mukati mechikamu chakakodzera.Kana ikanyanya kukurumidza, kupisa kwekushisa kuchaitika, uye bhodhi redunhu uye zvikamu zvinogona kukuvara.Kana ikanyanya kunonoka, solvent haizonyungudika zvakakwana.Welding quality.Nekuda kwekukurumidza kupisa kumhanya, mutsauko wetembiricha muchoto chekuyerera wakakura muchikamu chekupedzisira chenzvimbo yekushisa.Kuti udzivise kuvhunduka kwekupisa kubva mukukuvadza zvikamu, huwandu hwekudziya hwepamusoro hunowanzo kutsanangurwa se4 ℃/S, uye chiyero chekukwira chinowanzoiswa pa1 ~ 3 ℃/S.
Chinangwa chikuru chedanho rekuchengetedza kupisa ndechekudzikamisa tembiricha yechikamu chimwe nechimwe muchoto chekuyerera uye kuderedza mutsauko wekushisa.Ipa nguva yakakwana munzvimbo iyi kuita kuti tembiricha yechikamu chikuru chibatane nechikamu chidiki, uye kuve nechokwadi chekuti flux mu solder paste yakanyungudika.Pakupera kwechikamu chekuchengetedza kupisa, maokisidhi pamapadhi, mabhora ekutengesa uye mapini echikamu anobviswa pasi pechiito chekuyerera, uye kutonhora kwebhodhi redunhu rose kunoenderanawo.Izvo zvinofanirwa kucherechedzwa kuti zvikamu zvese paSMA zvinofanirwa kunge zvine tembiricha yakafanana pakupera kwechikamu ichi, zvikasadaro, kupinda muchikamu chekudzoka kunokonzeresa dzakasiyana-siyana dzakaipa solder phenomena nekuda kwekushisa kusina kuenzana kwechikamu chimwe nechimwe.
Kana PCB ichipinda munzvimbo yekuyerera, tembiricha inokwira nekukurumidza kuitira kuti solder paste isvike pakunyungudika.Nzvimbo yakanyunguduka yelead solder paste 63sn37pb i183 ° C, uye nzvimbo yakanyunguduka yelead solder paste 96.5Sn3Ag0.5Cu i217 ° C.Munharaunda iyi, kupisa kwekushisa kunogadzika kumusoro, kuitira kuti kutonhora kwechikamu kukwire nokukurumidza kusvika kuhutano hwekukosha.Iko kukosha kwekushisa kweiyo reflow curve kunowanzo kutsanangurwa nekunyunguduka kwekushisa kweiyo solder uye kupisa kwekudzivirira kupisa kweiyo yakaungana substrate uye zvikamu.Muchikamu che reflow, tembiricha yekudziya inosiyana zvichienderana neiyo solder paste inoshandiswa.Kazhinji, tembiricha yepamusoro yemutobvu i230-250℃, uye tembiricha yemutobvu i210-230℃.Kana kutonhora kwakanyanya kuderera, zviri nyore kugadzira majoini anotonhora uye kusakwana wetting;kana tembiricha yakanyanyisa, coking uye delamination ye epoxy resin substrate uye zvikamu zvepurasitiki zvingangoitika, uye yakawandisa eutectic simbi makomisheni ichaumba, izvo zvinozotungamira kune brittle solder majoini, izvo zvinokanganisa kusimba kwesimbi.Munzvimbo ye reflow soldering, nyatsoteerera kune nguva yekudzorera kuti isanyanya kureba, kudzivirira kukanganisa kwevira reflow, inogonawo kukonzera kushanda kusina kunaka kwezvikamu zvemagetsi kana kuita kuti bhodhi redunhu ripiswe.
Panguva ino, tembiricha inotonhodzwa kusvika pazasi petembiricha yakasimba kuti isimbise majoini anotengeswa.Chiyero chekutonhora chichakanganisa simba rejoint solder.Kana kutonhora kwakanyanya kunonoka, kuchaita kuti eutectic metal compounds yakawandisa ibudiswe, uye zviyo zvakakura zvinowanzoitika pamajoini ekutengesa, izvo zvinoderedza kusimba kwemajoini ekutengesa.Mwero wekutonhodza munzvimbo yekutonhodza kazhinji inenge 4 ℃/S, uye mwero wekutonhora i75 ℃.anogona.
Mushure mekukwesha solder paste nekumisikidza smt chip components, dare redunhu rinotakurwa kuburikidza negwara renjanji reflow soldering vira, uye mushure mekuita kwenzvimbo ina dzetembiricha pamusoro pechoto reflow soldering, yakazara soldered redunhu bhodhi rinoumbwa.Iyi ndiyo yose nheyo yekushanda yevheni reflow.
Nguva yekutumira: Jul-29-2020