-Kuchokera ku dziko la pcb,

Kuwotcha kwa zinthu, zomwe zimadziwikanso kuti retardancy yamoto, kuzimitsa zokha, kukana lawi, kukana moto, kukana moto, kuyaka ndi kuyaka kwina, ndikuwunika kuthekera kwa zinthuzo kukana kuyaka.

Chitsanzo cha zinthu zoyaka moto chimayatsidwa ndi lawi lomwe limakwaniritsa zofunikira, ndipo lawilo limachotsedwa pambuyo pa nthawi yodziwika.Mlingo woyaka moto umawunikidwa molingana ndi kuchuluka kwa kuyaka kwachitsanzo.Pali magawo atatu.Njira yoyesera yopingasa yachitsanzo imagawidwa mu FH1, FH2, FH3 mlingo wachitatu, njira yoyesera yowonekera imagawidwa mu FV0, FV1, VF2.

The olimba PCB bolodi lagawidwa HB bolodi ndi V0 bolodi.

Tsamba la HB lili ndi mphamvu yocheperako yamoto ndipo limagwiritsidwa ntchito kwambiri pama board ambali imodzi.

VO board ili ndi kuchedwa kwamoto kwambiri ndipo imagwiritsidwa ntchito kwambiri pama board okhala ndi mbali ziwiri komanso masanjidwe ambiri.

Mtundu uwu wa bolodi wa PCB womwe umakwaniritsa zofunikira za V-1 moto umakhala FR-4 board.

V-0, V-1, ndi V-2 ndi magiredi osayaka moto.

Bolodi lozungulira liyenera kukhala lopanda moto, silingatenthe pa kutentha kwina, koma limatha kufewetsa.Kutentha kwa nthawiyi kumatchedwa kutentha kwa galasi (Tg point), ndipo mtengo uwu umagwirizana ndi kukhazikika kwa bolodi la PCB.

Kodi bolodi lalitali la Tg PCB ndi chiyani komanso ubwino wogwiritsa ntchito Tg PCB yapamwamba?

Pamene kutentha kwa bolodi lapamwamba la Tg losindikizidwa likukwera kudera linalake, gawo lapansi lidzasintha kuchokera ku "galasi la galasi" kupita ku "boma la rabara".Kutentha panthawiyi kumatchedwa kutentha kwa galasi (Tg) pa bolodi.Mwa kuyankhula kwina, Tg ndiye kutentha kwambiri komwe gawo lapansi limakhala lolimba.

Kodi mitundu yeniyeni ya matabwa a PCB ndi chiyani?

Agawikana ndi giredi kuyambira pansi mpaka pamwamba motere:

94HB - 94VO - 22F - CEM-1 - CEM-3 - FR-4

Zambiri ndi izi:

94HB: makatoni wamba, osati moto (zotsika kwambiri kalasi, kufa kukhomerera, sangagwiritsidwe ntchito ngati bolodi magetsi)

94V0: Kadibodi Yoyimitsa Moto (Kufa Kukhomerera)

22F: Single-mbali imodzi theka galasi fiber board (kufa kukhomerera)

CEM-1: bolodi la fiberglass yokhala ndi mbali imodzi (kubowola pakompyuta ndikofunikira, osati kubaya)

CEM-3: Magalasi opangidwa ndi magalasi awiri (kupatula makatoni amitundu iwiri, ndizitsulo zotsika kwambiri za bolodi lokhala ndi mbali ziwiri, zosavuta

Izi zitha kugwiritsidwa ntchito ngati mapanelo apawiri, omwe ndi 5 ~ 10 yuan/square mita otsika mtengo kuposa FR-4)

FR-4: bolodi la fiberglass yokhala ndi mbali ziwiri

Bolodi lozungulira liyenera kukhala lopanda moto, silingatenthe pa kutentha kwina, koma limatha kufewetsa.Kutentha kwa nthawiyi kumatchedwa kutentha kwa galasi (Tg point), ndipo mtengo uwu umagwirizana ndi kukhazikika kwa bolodi la PCB.

Kodi bolodi lalitali la Tg PCB ndi chiyani komanso ubwino wogwiritsa ntchito Tg PCB yapamwamba.Kutentha kumakwera kudera linalake, gawo lapansi lidzasintha kuchokera ku "galasi" kupita ku "rabala".

Kutentha panthawiyo kumatchedwa kutentha kwa galasi (Tg) ya mbale.Mwa kuyankhula kwina, Tg ndiye kutentha kwambiri (°C) komwe gawo lapansi limakhala lolimba.Ndiko kunena kuti, wamba PCB gawo lapansi zipangizo osati kutulutsa softening, mapindikidwe, kusungunuka ndi zochitika zina pa kutentha kwambiri, komanso kusonyeza kuchepa kwambiri mawotchi ndi magetsi makhalidwe (Ndikuganiza kuti simukufuna kuona gulu la matabwa PCB ndikuwona izi pazogulitsa zanu.

Mbale wamba wa Tg ndi wopitilira madigiri 130, Tg yapamwamba nthawi zambiri imakhala yopitilira madigiri 170, ndipo sing'anga Tg imakhala pafupifupi madigiri 150.

Kawirikawiri matabwa a PCB osindikizidwa ndi Tg ≥ 170 ° C amatchedwa mapepala apamwamba a Tg osindikizidwa.

Pamene Tg ya gawo lapansi ikuwonjezeka, kukana kutentha, kukana chinyezi, kukana kwa mankhwala, kukhazikika ndi zizindikiro zina za bolodi losindikizidwa zidzakonzedwa bwino ndikusintha.Kukwera kwa mtengo wa TG, kumakhala bwino kukana kutentha kwa bolodi, makamaka m'njira yopanda chitsogozo, pomwe ntchito zapamwamba za Tg ndizofala kwambiri.

High Tg imatanthauza kukana kutentha kwakukulu.Ndi chitukuko chofulumira cha mafakitale a zamagetsi, makamaka zinthu zamagetsi zomwe zimayimiridwa ndi makompyuta, kukula kwa magwiridwe antchito apamwamba komanso ma multilayer apamwamba kumafuna kukana kwa kutentha kwambiri kwa zinthu zam'munsi za PCB monga chitsimikizo chofunikira.Kuwonekera ndi chitukuko cha matekinoloje okwera kwambiri omwe amaimiridwa ndi SMT ndi CMT apangitsa ma PCB kukhala osasiyanitsidwa ndi chithandizo cha kutentha kwakukulu kwa magawo ang'onoang'ono pogwiritsira ntchito kabowo kakang'ono, waya wabwino, ndi kupatulira.

Choncho, kusiyana pakati pa FR-4 ndi Tg FR-4 yapamwamba: imakhala yotentha, makamaka pambuyo pa kuyamwa kwa chinyezi.

Pansi pa kutentha, pali kusiyana kwa mphamvu zamakina, kukhazikika kwa mawonekedwe, kumamatira, kuyamwa kwa madzi, kuwonongeka kwa kutentha, ndi kuwonjezereka kwa kutentha kwa zipangizo.Zogulitsa zapamwamba za Tg ndizabwinoko kuposa zida wamba za PCB.

M'zaka zaposachedwapa, chiwerengero cha makasitomala omwe akufuna kupanga mapepala apamwamba a Tg chawonjezeka chaka ndi chaka.

Ndi chitukuko ndi mosalekeza luso lamagetsi, zofunika zatsopano nthawi zonse kuperekedwa kwa kusindikizidwa dera gulu gawo lapansi zipangizo, potero kulimbikitsa chitukuko mosalekeza wa mfundo mkuwa atavala laminate.Pakalipano, mfundo zazikuluzikulu za substrate zipangizo ndi izi.

① Miyezo Yadziko Pakali pano, mikhalidwe yadziko langa pakugawika kwa zida za PCB pagawo la magawo akuphatikizapo GB/

T4721-47221992 ndi GB4723-4725-1992, mfundo zamkuwa zokhala ndi laminate ku Taiwan, China ndi CNS miyezo, zomwe zimachokera ku Japan JIs muyezo ndipo zidaperekedwa mu 1983.

②Miyezo ina yadziko ndi: Miyezo ya Japan JIS, American ASTM, NEMA, MIL, IPc, ANSI, UL miyezo, British Bs miyezo, German DIN ndi VDE miyezo, French NFC ndi UTE miyezo, ndi Canadian CSA Standards, Australia AS muyezo, wakale Soviet Union's FOCT standard, International IEC standard, etc.

Opereka zida zoyambirira za PCB ndizodziwika komanso zimagwiritsidwa ntchito: Shengyi \ Jiantao \ International, etc.

● Landirani zikalata: protel autocad powerpcb orcad gerber kapena bolodi lenileni kukopera bolodi, etc.

● Mitundu ya mapepala: CEM-1, CEM-3 FR4, zipangizo zapamwamba za TG;

● Kukula kwakukulu kwa bolodi: 600mm*700mm (24000mil*27500mil)

● Makulidwe a bolodi: 0.4mm-4.0mm (15.75mil-157.5mil)

● Chiwerengero chapamwamba cha zigawo zopangira: 16Layers

● makulidwe a zojambulazo za mkuwa: 0.5-4.0(oz)

● Anamaliza bolodi makulidwe kulolerana: +/-0.1mm(4mil)

● Kupanga kukula kulolerana: mphero kompyuta: 0.15mm (6mil) kufa punching mbale: 0.10mm (4mil)

● Mzere wocheperako/katalikirana kochepa: 0.1mm (4mil) Kutha kuwongolera m'lifupi: <+-20%

● Bowo laling'ono lazinthu zomalizidwa: 0.25mm (10mil)

The osachepera kukhomerera dzenje awiri a mankhwala yomalizidwa: 0.9mm (35mil)

Kutha kulolerana kwa dzenje: PTH: + -0.075mm (3mil)

NPTH: + -0.05mm (2mil)

● Anamaliza dzenje khoma mkuwa makulidwe: 18-25um (0.71-0.99mil)

● Mipata yocheperako ya SMT: 0.15mm (6mil)

● Kupaka pamwamba: golide womiza ndi mankhwala, utsi wa malata, golide wopaka faifi (madzi/golide wofewa), guluu wabuluu wa silk screen, ndi zina zotero.

● Makulidwe a chigoba cha solder pa bolodi: 10-30μm (0.4-1.2mil)

● Kuchucha mphamvu: 1.5N/mm (59N/mil)

● Kulimba kwa chigoba cha solder: > 5H

● Solder chigoba pulagi dzenje mphamvu: 0.3-0.8mm (12mil-30mil)

● Dielectric yosasintha: ε = 2.1-10.0

● Insulation resistance: 10KΩ-20MΩ

● Kulephera kwakhalidwe: 60 ohm±10%

● Kutentha kwa kutentha: 288℃, 10 sec

● Warpage wa bolodi yomalizidwa: <0.7%

● Kugwiritsa ntchito mankhwala: zida zoyankhulirana, zamagetsi zamagalimoto, zida, makina oyika padziko lonse lapansi, kompyuta, MP4, magetsi, zida zapanyumba, ndi zina.