Kana tichitaura nezve solder beading, isu chekutanga tinoda kunyatso tsanangura iyo SMT defect. Iyo tin bead inowanikwa pane reflow welded plate, uye unogona kuona uchingotarisa kuti ibhora hombe rerata rakaiswa mudziva rekuyerera rakamisikidzwa padivi pezvinhu zvakasarudzika zvine hurefu hwepasi hwakaderera, senge sheet resistors uye capacitor, nhete. diki profile package (TSOP), diki profile transistors (SOT), D-PAK transistors, uye kupikisa magungano. Nekuda kwechinzvimbo chavo maererano nezvikamu izvi, marata mabhedhi anowanzo kunzi "masatellite".
Tin mabheti haangokanganisa kutaridzika kwechigadzirwa, asi zvinonyanya kukosha, nekuda kwehuwandu hwezvikamu pane yakadhindwa ndiro, kune njodzi yekupfupika kwemutsara wemutsara panguva yekushandiswa, nekudaro inokanganisa kunaka kwezvigadzirwa zvemagetsi. Kune zvikonzero zvakawanda zvekugadzirwa kwemarata mabhesi, kazhinji anokonzerwa nechimwe kana zvimwe zvinhu, saka tinofanira kuita basa rakanaka rekudzivirira nekuvandudza kuitira kuti tizvidzore zviri nani. Nyaya inotevera ichakurukura zvinhu zvinokanganisa kugadzirwa kwemarata uye matanho ekuderedza kugadzirwa kwemarata.
Sei mabhedha emarata achiitika?
Zvichitaurwa zviri nyore, mabheji emarata anowanzo kubatanidzwa neakawandisa solder paste deposition, nekuti haina "muviri" uye inosvinwa pasi pezvikamu zvakadzika kuti zvigadzire mabheji emarata, uye kuwedzera kwekuonekwa kwavo kunogona kuverengerwa nekuwedzera kwekushandiswa kweyakagezwa. -mu solder paste. Kana iyo chip element ichiiswa mune rinseable solder paste, iyo solder paste inonyanya kudzvanya pasi pechikamu. Kana iyo yakaiswa solder paste yakawandisa, zviri nyore kuextrusion.
Zvinhu zvikuru zvinokanganisa kugadzirwa kwemarata ndezvi:
(1) Kuvhura template uye pad graphic dhizaini
(2) Kuchenesa matemplate
(3) Kudzokorora kurongeka kwemuchina
(4) Temperature curve ye reflow furnace
(5) Patch pressure
(6) solder paste uwandu kunze kwepani
(7) Kureba kwekumhara kwerata
(8) Gasi kuburitswa kwezvinhu zvinoputika muplate yemutsara uye solder resistance layer
(9)Inoenderana nekuyerera
Nzira dzekudzivirira kugadzirwa kwesimbi bead:
(1) Sarudza yakakodzera padhi mifananidzo uye saizi dhizaini. Mune chaiyo padhi dhizaini, inofanirwa kusanganiswa nePC, uyezve zvichienderana nechaiyo chikamu pasuru saizi, welding yekupedzisira saizi, kugadzira inoenderana padhi saizi.
(2) Ngwarira kugadzirwa kwesimbi mesh. Izvo zvinodikanwa kugadzirisa saizi yekuvhura zvinoenderana neiyo chaiyo chikamu marongero ePCBA board kudzora huwandu hwekudhinda hwema solder paste.
(3) Zvinokurudzirwa kuti PCB isina mabhodhi ane BGA, QFN uye gobvu tsoka zvikamu pabhodhi kutora yakasimba kubheka chiito. Kuve nechokwadi chekuti hunyoro hwepamusoro pane solder ndiro inobviswa kuti iwedzere kusimba.
(4) Kuvandudza kunaka kwekuchenesa template. Kana kuchenesa kusina kuchena. Residual solder paste pazasi pekuvhurwa kwetemplate inoungana pedyo nekuvhurwa kwetemplate uye kuita yakawandisa solder paste, zvichikonzera marata mabhedhi.
(5) Kuve nechokwadi chekudzokorora kwemidziyo. Kana iyo solder paste yakadhindwa, nekuda kweiyo offset pakati pe template uye padhi, kana iyo offset yakakura kwazvo, iyo solder paste ichanyoroveswa kunze kwepedhi, uye mabheji etani achaonekwa nyore mushure mekupisa.
(6) Dzora kukwira kwekumanikidza kwemuchina unokwirisa. Kunyangwe iyo yekumanikidza yekudzora modhi yakasungirirwa, kana iyo chikamu chehukobvu kutonga, Zvirongwa zvinoda kugadziriswa kudzivirira mabheji ematani.
(7)Optimize tembiricha curve. Dzora tembiricha ye reflow welding, kuitira kuti iyo solvent inogona kunyungudika papuratifomu iri nani.
Usatarise "satellite" idiki, imwe haigone kudhonzwa, dhonza muviri wese. Nemagetsi, dhiyabhorosi anowanzo ari mune zvakadzama. Naizvozvo, pamusoro pekutariswa kwevashandi vekugadzira maitiro, madhipatimendi akakodzera anofanirwawo kushandirapamwe, uye kutaurirana nevashandi vemaitiro munguva yekuchinja kwezvinhu, kutsiva uye zvimwe zvinhu kudzivirira shanduko mumaparamita emaitiro anokonzerwa nekuchinja kwezvinhu. Mugadziri ane mutoro wePCB wedunhu dhizaini anofanirwawo kutaurirana nevashandi vekuita, tarisa kune matambudziko kana mazano anopihwa nevashandi vekuita uye kuvavandudza zvakanyanya sezvinobvira.
Nguva yekutumira: Jan-09-2024
