Zvinoenderana neEU's RoHS Directive (Directive Act yeEuropean Parliament neKanzuru yeEuropean Union pamusoro pekurambidzwa kwekushandiswa kwezvimwe zvinhu zvine njodzi mumagetsi nemidziyo yemagetsi), kuraira kunoda kurambidzwa kwemusika weEU kutengesa zvemagetsi uye zvemagetsi. midziyo yemagetsi ine zvinhu zvitanhatu zvine njodzi senge lead se "green kugadzira" lead-yemahara maitiro ayo ave maitiro asingadzokerike ebudiriro kubvira Chikunguru 1, 2006.
Pave nemakore anopfuura maviri kubva pakatanga nzira yekusununguka kubva padanho rekugadzirira.Vazhinji vagadziri vezvigadzirwa zvemagetsi muChina vakaunganidza ruzivo rwakawanda rwakakosha mushanduko inoshanda kubva kune lead-isina soldering kuenda kune lead-isina soldering.Ikozvino iyo nzira yekusununguka-yemahara iri kuramba ichiwedzera kukura, chinangwa chebasa chevagadziri vazhinji chashanduka kubva pakungokwanisa kuita kugadzirwa-isina kugadzirwa kusvika pakunyatso kuvandudza mwero wekutengesa-isina dhadha kubva kwakasiyana siyana semidziyo. , zvinhu, kunaka, maitiro uye kushandiswa kwesimba..
Iyo inotungamira-isina reflow soldering process ndiyo inonyanya kukosha solder process mune yazvino pamusoro pekukwira tekinoroji.Yakave ichishandiswa zvakanyanya mumaindasitiri mazhinji anosanganisira nharembozha, makomputa, mota dzemagetsi, kudzora maseketi uye kutaurirana.Zvishandiso zvakawanda zvemagetsi zvepakutanga zvinoshandurwa kubva kuburikidza-gomba kuenda pamusoro pegomo, uye reflow soldering inotsiva wave soldering mune yakakura renji inzira iri pachena muindasitiri yekutengesa.
Saka ndeipi basa richaitwa reflow soldering midziyo mukuwedzera kukura-isina SMT maitiro?Ngatizvitarisei kubva pamaonero eiyo yese SMT pamusoro pekukwira mutsara:
Iyo yese SMT pamusoro pekukwira mutsara kazhinji ine zvikamu zvitatu: screen printer, yekuisa muchina uye reflow oveni.Pamichina yekuisa, kana ichienzaniswa neyemahara-isina lead, hapana chitsva chinodiwa chemidziyo pachayo;Kumuchina wekudhinda wescreen, nekuda kwemusiyano mudiki mune zvemuviri zvimiro zve lead-isina uye leaded solder paste, zvimwe zvinodiwa zvekuvandudza zvinoiswa pamberi pemidziyo pachayo, asi hapana shanduko yemhando;Chinetso chemutobvu-isina kudzvanywa kuri pairi reflow oveni.
Sezvaunoziva mese, nzvimbo inonyungudika ye lead solder paste (Sn63Pb37) i183 madhigirii.Kana iwe uchida kuumba yakanaka solder joint, unofanira kuva 0.5-3.5um ukobvu intermetallic komboni panguva soldering.Iyo tembiricha yekuumbwa kweiyo intermetallic komisheni ndeye 10-15 madhigirii pamusoro penzvimbo yekunyungudika, inova 195-200 ye leaded soldering.degree.Iyo yakanyanya tembiricha yezvinhu zvekutanga zvemagetsi pabhodhi redunhu kazhinji 240 madhigirii.Naizvozvo, kune inotungamira solder, iyo yakakodzera solder process hwindo ndeye 195-240 madhigirii.
Lead-isina solder yakaunza shanduko huru kune solder process nekuti kunyungudika kwe lead-isina solder paste yachinja.Ikozvino inowanzoshandiswa lead-free solder paste is Sn96Ag0.5Cu3.5 ine melting point ye217-221 degrees.Yakanaka inotungamira-isina solder inofanirawo kuumba intermetallic makomisheni ane ukobvu hwe0.5-3.5um.Iyo tembiricha yekuumbwa kweiyo intermetallic komisheni zvakare 10-15 madhigirii pamusoro penzvimbo yakanyunguduka, iri 230-235 madhigirii ekutengesa-isina musodha.Sezvo tembiricha yepamusoro ye lead-isina soldering yemagetsi ekutanga michina isingachinji, iyo yakakodzera solder process hwindo re lead-isina soldering ndeye 230-240 madhigirii.
Kudzikiswa kwakanyanya kwehwindo rekuita kwakaunza matambudziko makuru ekuvimbisa kunaka kwewelding, uye kwakaunzawo zvinodiwa zvepamusoro zvekudzikama uye kuvimbika kwemidziyo isina mutobvu.Nekuda kweiyo lateral tembiricha mutsauko mumidziyo pachayo, uye mutsauko mukupisa kwekugona kwezvinhu zvekutanga zvemagetsi panguva yekudziya, iyo solder tembiricha process hwindo renji rinogona kugadziridzwa mu lead-isina reflow soldering process control inova diki kwazvo. .Uku ndiko kuoma chaiko kwe lead-isina reflow soldering.Iyo chaiyo inotungamira-isina uye inotungamira-isina reflow soldering process kuenzanisa inoratidzwa muMufananidzo 1.
Muchidimbu, ovheni yekuyerera inoita basa rakakosha mumhando yekupedzisira yechigadzirwa kubva pakuona kwese kutungamirira-isina maitiro.Nekudaro, kubva pakuona kwekudyara mune yese SMT mutsara wekugadzira, iyo mari mune inotungamira-isina solder mavira kazhinji inongoverengera 10-25% yekudyara mune yese SMT mutsetse.Ichi ndicho chikonzero nei vagadziri vemagetsi mazhinji vakakurumidza kutsiva maovheni avo ekutanga ekudzoreredza maovheni emhando yepamusoro mushure mekuchinja kugadzira-isina lead.
Nguva yekutumira: Aug-10-2020