Munhu wose anoziva kudzivirira PCB kukotama uye kuputira bhodhi kubva pakupinda muchoto che reflow. Inotevera itsananguro yemunhu wese:

1. Deredza simba rekushisa paPCB board stress

Sezvo “tembiricha” ndiyo inonyanya kukonzera kushushikana kwebhodhi, chero bedzi tembiricha yehovhoni inoyerera ichidzikiswa kana mwero wekupisa uye kutonhora kwebhodhi muovheni reflow inononoka, kuitika kwekukotama kweplate uye warpage kunogona kuve kwakanyanya. kuderedzwa. Zvisinei, mamwe migumisiro inogona kuitika, yakadai solder short circuit.

2. Kushandisa high Tg sheet

Tg ndiyo tembiricha yekuchinja kwegirazi, ndiko kuti, tembiricha painochinja zvinhu kubva pagirazi kuenda kune rabha. Iyo yakaderera kukosha kweTg yezvinhu, nekukurumidza bhodhi rinotanga kupfava mushure mekupinda muovheni yekuyerera, uye nguva yainotora kuti ive yakapfava rubber mamiriro Inozoita zvakare kureba, uye deformation yebhodhi ichave yakakomba. . Kushandisa yakakwira Tg ndiro inogona kuwedzera kugona kwayo kutsungirira kushushikana uye deformation, asi mutengo wezvinhu wakakwira.

3. Wedzera kukora kwebhodhi redunhu

Kuti uwane chinangwa chekureruka uye kutetepa kune zvakawanda zvigadzirwa zvemagetsi, ukobvu hwebhodhi hwakasiya 1.0mm, 0.8mm, uye kunyangwe ukobvu hwe0.6mm. Zvakanyanya kuoma kune ukobvu hwakadaro kuchengetedza bhodhi kubva pakukanganisa mushure memoto wekuyerera. Zvinokurudzirwa kuti kana pasina chinodikanwa chekureruka uye kutetepa, bhodhi * inogona kushandisa ukobvu hwe1.6mm, iyo inogona kuderedza zvakanyanya njodzi yekukotama uye deformation yebhodhi.

4. Deredza ukuru hwebhodhi redunhu uye kuderedza nhamba yepuzzles

Sezvo mazhinji emafuta ekudzoreredza anoshandisa maketani kutyaira bhodhi redunhu kumberi, iyo yakakura saizi yedare redunhu ichave nekuda kwehuremu hwayo, dent uye deformation muvira reflow, saka edza kuisa rutivi rurefu rwedunhu redunhu. somupendero wepuranga. Paketani yevira reflow, kuora mwoyo uye deformation inokonzerwa nekurema kwebhodhi redunhu inogona kuderedzwa. Kuderedzwa kwenhamba yemapanera kunobvawo pachikonzero ichi. Low dent deformation.

5. Yakashandiswa tireyi yevira remoto

Kana nzira dziri pamusoro dzakaoma kuwana, * reflow carrier / template inoshandiswa kuderedza kuwanda kwe deformation. Chikonzero nei reflow carrier/template ichigona kuderedza kukotama kweplate imhaka yekuti inotarisirwa kungave kuwedzera kwemafuta kana kutonhora kwechando. Iyo tereyiti inogona kubata bhodhi redunhu uye kumirira kusvikira kutonhora kwebhodhi redunhu kwakaderera pane kukosha kweTg uye kutanga kuomesa zvakare, uye kunogonawo kuchengetedza ukuru hwebindu.

Kana iyo imwe-layer pallet isingakwanise kuderedza deformation yedare redunhu, chivharo chinofanira kuwedzerwa kuti chisungirire bhodhi redunhu nepamusoro uye pasi pallets. Izvi zvinogona kuderedza zvakanyanya dambudziko rekutenderera bhodhi deformation kuburikidza nereflow furnace. Nekudaro, iyi tireyi yeovheni inodhura zvakanyanya, uye inofanirwa kuiswa nemaoko uye kudzokororwa.

6. Shandisa Router panzvimbo yeV-Cheka kushandisa sub-board
Sezvo V-Cut ichaparadza simba rekugadzirisa kwepaneti pakati pemapuranga edunhu, edza kusashandisa V-Cut sub-board kana kuderedza kudzika kweV-Cut.