Mukugadziriswa kwePCBA, kunaka kwewelding yebhodhi redunhu kune simba guru pakuita uye kuonekwa kwebhodhi redunhu. Naizvozvo, zvakakosha kwazvo kudzora welding mhando yePCB redunhu bhodhi.PCB redunhu bhodhiwelding mhando yakanyatsoenderana nedhizaini bhodhi dhizaini, process zvinhu, welding tekinoroji uye zvimwe zvinhu.
一、 Dhizaini yePCB redunhu bhodhi
1. Padhi kugadzira
(1) Paunenge uchigadzira mapadhi e-plug-in zvikamu, saizi yepadhi inofanirwa kugadzirwa nenzira kwayo. Kana iyo padhi yakakura kwazvo, iyo solder inopararira nzvimbo yakakura, uye majoini e solder akaumbwa haana kuzara. Kune rumwe rutivi, tension yepamusoro yefoil yemhangura yepadhi diki idiki, uye majoini anotengeswa akaumbwa haana-wetting solder joints. Mugero wekuenzanisa pakati peaperture uye chikamu chinotungamira chakakurisa uye zviri nyore kukonzera manyepo soldering. Kana iyo aperture iri 0.05 - 0.2mm yakafara kupfuura lead uye padhi dhayamita iri 2 - 2.5 times the aperture, ndiyo yakanaka mamiriro ekunama.
(2) Paunenge uchigadzira mapadhi ezvikamu zvechip, zvinotevera zvinofanirwa kutariswa: Kuti ubvise "mumvuri mhedzisiro" zvakanyanya sezvinobvira, solder terminals kana mapini eSMD anofanirwa kutarisana negwara rekuyerera kwetini kuti rifambise. kubata nekuyerera kwerata. Deredza kutengesa kwenhema uye kushayikwa kwekutengesa. Zvidiki zvidiki hazvifanirwe kuiswa mushure mezvimedu zvakakura kudzivirira zvikamu zvakakura kubva pakukanganisa kuyerera kwe solder uye kubata mapedhi ezvikamu zvidiki, zvichiita kuti solder idonhe.
2, PCB redunhu bhodhi flatness control
Wave soldering ine zvinodiwa zvakakwirira pane flatness yemapuranga akadhindwa. Kazhinji, iyo warpage inodiwa kuve isingasviki 0.5mm. Kana yakakura kudarika 0.5mm, inoda kubatwa. Kunyanya, ukobvu hwemamwe mabhodhi akadhindwa anongova 1.5mm, uye iwo warpage zvinodiwa zvakakwirira. Zvikasadaro, iyo welding mhando haigone kuvimbiswa. Zvinhu zvinotevera zvinofanira kutariswa:
(1) Chengeta nemazvo mabhodhi akadhindwa uye zvikamu uye kupfupisa nguva yekuchengetedza zvakanyanya sezvinobvira. Munguva yewelding, foil yemhangura uye chikamu chinotungamira chisina guruva, girisi, uye oxides zvinogoneka pakuumbwa kweanokwanisa solder majoini. Nokudaro, mapuranga akadhindwa uye zvikamu zvinofanira kuchengetwa munzvimbo yakaoma. , munzvimbo yakachena, uye kupfupisa nguva yekuchengetedza zvakanyanya sezvinobvira.
(2) Pamapuranga akadhindwa akaiswa kwenguva yakareba, nzvimbo yacho inowanzoda kucheneswa. Izvi zvinogona kuvandudza solderability uye kuderedza nhema soldering uye bhiriji. Kune mapini echikamu ane imwe dhigirii yepasi oxidation, iyo yepamusoro inofanira kubviswa kutanga. oxide layer.
二. Kudzora kwehutano hwezvinhu zvekugadzirisa
Mune wave soldering, iwo makuru maitiro ekushandisa anoshandiswa ndeaya: flux uye solder.
1. Kushandiswa kweflux kunogona kubvisa oxides kubva kune welding surface, kudzivirira zvakare-oxidation ye solder uye welding surface panguva yekuputika, kuderedza kushushikana kwepamusoro kweiyo solder, uye kubatsira kuendesa kupisa kunzvimbo yewelding. Flux inoita basa rakakosha mukutonga kwemhando yewelding.
2. Kudzora kwehutano hwe solder
Tin-lead solder inoramba ichiwedzera oxidize patembiricha yakakwira (250 ° C), zvichiita kuti tin-tine yemukati-lead solder muhari irambe ichidzikira nekutsauka kubva paeutectic point, zvichikonzera kusanaya kwemvura uye matambudziko emhando sekuenderera. soldering, empty soldering, uye kusakwana solder joint simba. .
三、Welding process parameter control
Kupesvedzera kwewelding process parameters pane welding surface quality inenge yakaoma.
Pane akati wandei pfungwa huru: 1. Kudzora preheating tembiricha. 2. Welding track inclination angle. 3. Wave crest urefu. 4. Welding tembiricha.
Welding inhanho yakakosha muPCB wedunhu bhodhi kugadzira maitiro. Kuti uve nechokwadi chekushongedza kwemhando yebhodhi redunhu, munhu anofanirwa kuve nehunyanzvi mumhando dzekudzora nzira uye hunyanzvi hwekushongedza.
