1. Nei redunhu bhodhi chinodiwa sandara chaizvo
Munguva otomatiki kupinza mutsetse, kana kudhinda redunhu bhodhi hakusi sandara, zvichaita kuti nzvimbo kuti kururama, zvakamisa hurongwa hazvigoni akaiswa mugomba rejeri uye pemvura ndiro, uye kunyange otomatiki chivhariso loader.When ari pcb bhodhi iro akaunganidza chazvo iri welded pashure pokunamatidza uye wetsoka chinhu rakaoma kuzovauraya neatly.The pcb puranga zvakare haakwanise iiswe ari mumuchina bhokisi kana panosangana iri muchina, saka, kuti pcb gungano fekitari musangano ndiro kuvhiringidzika kuri kwazvo troublesome.At ino, rokudhinda redunhu bhodhi wakapinda nenguva pamusoro chokugadza Chip kugadzwa, uye rakadhindwa redunhu bhodhi gungano chirimwa inofanira kuva zvakawanda kuzviomesera nezvaidiwa kuti ndiro akakuvadzwa.
2. Standard uye bvunzo nzira kuti yakarukwa
Maererano United States IPC-6012 (1996 yakabudiswa) << vanachandagwinyira akadhindwa redunhu bhodhi kuzivikanwa uye mabasa nokurondedzerwa >>, kuti zvinobvumidzwa kunonyanyisa the warp uye kukanganisa pemvura hwakawanda ndiro riri 0.75%, uye zvose zvimwe pCB mapuranga vanobvumirwa 1,5% .This yakawedzera zvinodiwa kuti pamusoro hwakawanda hwendefa Board of ipc-rb-276 (1992 shanduro) .At chipo, yakarukwa dhigirii pamusoro rezinesi mumwe yemagetsi pcb gungano chirimwa, zvisinei kaviri kana multi-rukoko pcb, 1.6mm ukobvu, kazhinji 0,70 ~ 0.75%, vazhinji SMT, BGA ndiro, kuti chinodiwa 0.5% .Some zvemagetsi mafekitari vanopesanisa kuti 0.3 muzana kuwedzera the warp mitemo, uye bvunzo the warp matanho vanotevera gb4677. 5-84 kana ipc-TM-650.2.4.22b.Put pcb bhodhi iri akapupurirawo papuratifomu, muedzo tsono kuti avhiringidze dhigirii makurusa emo, kuedza dhayamita ari tsono, yakakamurwa nokuda munyonga kureba pcb bhodhi, yakarukwa dhigirii of akadhindwa redunhu bhodhi kunogona dzaona.
3. the warp panguva mukugadzira muitiro
1. Engineering design: pamasikiro zvokudhinda redunhu bhodhi anofanira kucherechedzwa:
A. The nokurongwa prepreg pakati akaturikidzana vanofanira zvakafanana, ichibata, dzakadai laminates nhanhatu pcb Board , pakukora 1 ~ 2 uye 5 ~ 6 akaturikidzana inofanira kupindirana nemashoko nhamba Semi-Rakasimbisa zvidimbu, zvimwe zvakaturikidzaniswa kufurirwa richava nyore kuti avhiringidze.
B. Multi-laminated makirisito pcb uye mahwendefa Semi-arapwa inofanira kushandiswa chete nokutengesa wacho zvigadzirwa.
C. Nzvimbo rokunze A uye B mitsetse vanofanira kuva pedyo sezvo possible.If A chiso ndiyo A guru mhangura pamusoro, uye B ndiyo chete A mitsetse mishomanana, ndiro riri nyore kuti avhiringidze pashure etching.If maviri kumativi mutsetse nzvimbo musiyano iri guru, unogona kuwedzera mamwe hanya afoot iri mhou divi, kuti vaite.
2, Baking bhodhi vasati achicheka:
CCL kubikira pcb bhodhi asati achicheka (madhigirii 150, 8 ± 2 maawa) kuti chinangwa kubvisa mwando mukati bhodhi, uye kuti nebwe arapwa mukati ndiro, mamwe kubvisa residual kushushikana mune ndiro, iyo zvinobatsira kudzivirira bhodhi warping.At aripo, vakawanda kaviri madziro pcb, multi-rukoko pcb mapuranga vachiri kuomerera pre-blanking kana post-kugocha step.But pane pcb bhodhi kugadzira mufekitari, zvino pcb redunhu bhodhi fekitari kubikira bhodhi nguva mitemo uyewo dzisingapindirani, kubvira 4 kusvika 10 maawa, akataura kuti kirasi maererano kugadzirwa akadhindwa redunhu bhodhiuye mutengi kudiwa yakarukwa madhigirii kuti decide.Cut zvidimbu kana pashure yose chigamba bheka bheka hovhoni kucheka zvinhu, nzira mbiri vari noitika, Zvinokurudzirwa kutema bhodhi pashure achicheka. Yomukati bhodhi vanofanirawo kuva kupwa bhodhi.
3. yakarukwa uye weft pamusoro prepreg:
Mushure prepreg lamination, kuti shrinkage iri yakarukwa uye weft mirayiridzo yakasiyana, uye yakarukwa uye weft mirayiridzo anofanira kusiyaniswa apo blanking uye stacking.Otherwise, zviri nyore kuti avhiringidze Finished ndiro pashure laminating, kunyange kana zvakaoma kugadzirisa. Multi-rukoko pcb the warp zvikonzero, vazhinji lamination ari prepreg apo pakarukwa uye weft haana kusiyanisa, kusingasaruri kuburitsa mufananidzo kunokonzerwa.
How kusiyanisa Latitude uye Longitude? Roll prepreg akapeta mirayiridzo iri pakarukwa, uye upamhi mirayiridzo ndiye weft; mhangura foil bhodhi nokuda refu divi latitudinal, pfupi divi iri yakarukwa, kana asina chokwadi kuongorora pamwe mugadziri kana nokutengesa.
4. Stress pashure laminating:
multilayer pcb puranga, pashure kuzadzikisa hot-kudzvanya inotonhorera-wokudhinda akagerwa kana azvikuya cheek, ipapo sandara iri kugocha ari madhigirii muovheni 150 Celsius nokuda 4 kwemaawa, zvokuti intraplate mupfungwa zvishoma kusunungura uye kuti nebwe arapwa , danho iri Haatauri.
5. Kudiwa kutwasanudza ari bwendefa apo ra:
0,4 ~ 0.6mm matete multi-rukoko pcb pepuranga nokuda redunhu bhodhi yakanamirwa pamifananidzo uye hwakajeka yakanamirwa pamifananidzo uitwe aikosha NIP rwakapetwa, otomatiki yakanamirwa pamifananidzo mutsetse uri Feiba Clip pamusoro jira, ane kumativi pakapuranga akazara Clip pamusoro Fiba The parukungiso vari strung pamwechete kutwasanudza ose akadhindwa vematunhu mapuranga ari chinotenderera kuti kuifukidza mahwendefa haazorambi deform. Pasina izvi chiyero, pashure ra makumi maviri kana matatu microns mhangura layer jira achaparadzwa hwakakungwa, uye zvakaoma chingamubatsira.
6. Board kutonhora pashure inopisa mhepo munoenzanisa:
Inopisa mhepo yacho akadhindwa redunhu bhodhi iri sei nemupristi tembiricha iri solder muchimwiro (madhigirii anenge 250 Celsius). Mushure hwaputswa, inofanira kuiswa flat machena kana simbi yairema kuchitonhora sezvingatarisirwa, uye ipapo post-kubudiswa muchina ndiye cleaned.This akanaka nokuda the warp pakati boards.Some fekitari yokuwedzera nokupenya pemvura mutobvu , tini, bhodhi mumvura inotonhora, pakarepo mushure inopisa mhepo munoenzanisa kubva pashure mashomanana mumasekonzi iri reprocessing, fivha kwakadaro inotonhora nehana, nokuti mamwe mapuranga chinowanzoitika kubereka the warp, layered kana blister.In Uyezve mhepo kuyangarara mubhedha inogona kuwedzerwa kuchitonhora zvokushandisa.
7. the warp bhodhi kugadzira:
Mufekitari zvakanaka akakwanisa, bhodhi achava 100% flatness kuongorora yokupedzisira kuongorora. Zvisingagamuchirwi PCB mapuranga ose achaparadzwa ichisarudzwa, akaisa sechoto, chakabikwa dzimwe madhigirii 150 Celsius uye rinorema kumanikidzwa kuti 3 kusvika 6 maawa, uye pasi kumanikidzwa rwokuzvarwa kutonhora. Zvadaro tutunura ndiro uye kubvisa pcb bhodhi iri flatness cheki, saka kuti chikamu bhodhi angaponeswa, uye vamwe akadhindwa redunhu pamapuranga vanofanira kuva maviri katatu bheka kuti level.If Anti-ataurwa pamusoro apa -warping muitiro matanho hadzina chinozoiswa, vamwe bhodhi kubika maturo, chete scrapped.