Isu tese tinotarisira kuti iyo SMT maitiro akakwana, asi chokwadi chine hutsinye.Izvi zvinotevera ruzivo pamusoro pematambudziko anogona kuitika ezvigadzirwa zveSMT uye maitiro avo ekupikisa.
Zvadaro, tinotsanangura nyaya idzi zvakadzama.
1. Tombstone chiitiko
Tombstoneing, sezvakaratidzwa, idambudziko mune iro mapepa ezvikamu anosimuka kune rimwe divi.Ichi chikanganiso chinogona kuitika kana kudzvinyirirwa kwepamusoro kumativi ose echikamu chacho kusina kuenzana.
Kuti izvi zvisaitike, tinogona:
- Kuwedzera nguva munzvimbo inoshanda;
- Optimize pad dhizaini;
- Kudzivirira oxidation kana kusvibiswa kwezvikamu zvinoguma;
- Calibrate parameters ye solder paste printers nemichina yekuisa;
- Kuvandudza template dhizaini.
2. Solder zambuko
Kana solder paste inoumba hukama husina kujairika pakati pepini kana zvikamu, inonzi solder bridge.
Zvinopikisa zvinosanganisira:
- Calibrate printer kudzora chimiro chekudhinda;
- Shandisa solder paste ine viscosity chaiyo;
- Kukwenenzvera aperture pane template;
- Optimize pick uye isa michina kugadzirisa chikamu chinzvimbo uye kushandisa kumanikidza.
3. Zvikamu zvakakuvadzwa
Zvikamu zvinogona kuve nekutsemuka kana zvakakuvadzwa seyakagadzirwa kana panguva yekuiswa uye kuyerera
Kudzivirira dambudziko iri:
- Ongorora uye kurasa zvinhu zvakakanganisika;
- Dzivisa kusangana kwenhema pakati pezvikamu uye michina panguva yeSMT kugadzirisa;
- Dzora kutonhora kuri pasi pe4°C pasekondi.
4. kukanganisa
Kana mapini akakuvadzwa, anosimudza mapedhi uye chikamu chacho hachigoni kutengesa kune mapepa.
Kuti tidzivise izvi, tinofanira:
- Tarisa zvinhu kuti urase zvikamu nemapini akaipa;
- Ongorora zvikamu zvakaiswa nemaoko usati wazvitumira kune reflow process.
5. Nzvimbo isina kururama kana kutariswa kwezvikamu
Dambudziko iri rinosanganisira mamiriro akati wandei senge kusarongeka kana kutarisika kwakashata / polarity apo zvikamu zvinosungirirwa mumativi akasiyana.
Countermeasures:
- Kugadziriswa kwezviyero zvemushini wekuisa;
- Tarisa nemaoko zvikamu zvakaiswa;
- Dzivisa zvikanganiso zvekusangana usati wapinda mukuita reflow;
- Gadzirisa mafambiro emhepo panguva yekuyerera, iyo inogona kuridza chikamu kubva panzvimbo yayo chaiyo.
6. Solder paste dambudziko
Mufananidzo wacho unoratidza mamiriro matatu ane hukama kune solder paste vhoriyamu:
(1) Yakawandisa solder
(2) Kusakwana solder
(3) Hapana solder.
Pane kunyanya 3 zvinhu zvinokonzera dambudziko.
1) Kutanga, maburi etemplate anogona kuvharwa kana kuti asina kururama.
2) Chechipiri, viscosity ye solder paste inogona kunge isiri yakarurama.
3) Chechitatu, kushayikwa kwekutengesa kwezvikamu kana mapadhi kunogona kukonzera kusakwana kana kusakwana.
Countermeasures:
- yakachena template;
- Ita shuwa kurongeka kwakajairwa kwematemplate;
- Kunyatso kudzora kwe solder paste volume;
- Rasa zvikamu kana mapedhi ane low solderability.
7. Abnormal solder joints
Kana mamwe matanho ekutengesa akatadza, majoini ekutengesa anoumba akasiyana uye asingatarisirwi maumbirwo.
Maburi e stencil asina kujeka anogona kukonzera (1) mabhora ekutengesa.
Oxidation yemapedhi kana zvikamu, nguva isina kukwana muchikamu chekunyorova uye kukurumidza kukwira kwekushisa kwekudzoka kunogona kukonzera mabhora ekutengesa uye (2) maburi ekutengesa, kuderera kwekushisa kwekutengesa uye nguva shoma yekutengesa inogona kukonzera (3) solder icicles.
Countermeasures ndeaya anotevera:
- yakachena template;
- Kubika maPCB pamberi peSMT kugadzirisa kudzivirira oxidation;
- Nyatsogadzirisa tembiricha panguva yekugadzira welding.
Izvo zviri pamusoro ndiwo matambudziko akajairika emhando uye mhinduro dzakatsanangurwa neiyo reflow soldering inogadzira Chengyuan Indasitiri mune SMT maitiro.Ndinovimba zvichabatsira kwauri.
Nguva yekutumira: May-17-2023