-Ho tsoa lefats'eng la PC,
Ho chesa ha thepa, ho tsejoang hape e le ho lieha ha lelakabe, ho itima, ho hanyetsa lelakabe, ho hanyetsa lelakabe, ho hanyetsa mollo, ho chesa le lintho tse ling tse tukang, ke ho hlahloba bokhoni ba thepa ea ho hanela ho tuka.
Mohlala oa thepa e tukang o hotetsoa ka lelakabe le fihlelang litlhoko, 'me lelakabe le tlosoa ka mor'a nako e behiloeng.Boemo ba ho chesa bo hlahlojoa ho latela tekanyo ea ho tuka ha sampuli.Ho na le mekhahlelo e meraro.Mokhoa oa tlhahlobo o otlolohileng oa sampole o arotsoe ka FH1, FH2, FH3 boemo ba boraro, mokhoa oa tlhahlobo o otlolohileng o arotsoe ka FV0, FV1, VF2.
Boto e tiileng ea PCB e arotsoe ka boto ea HB le boto ea V0.
Letlapa la HB le na le ho lieha ha lelakabe le tlase 'me le sebelisoa haholo bakeng sa liboto tse nang le lehlakore le le leng.
Boto ea VO e na le ho lieha ho hoholo ha mollo 'me e sebelisoa haholo libotong tse nang le mahlakore a mabeli le tse nang le mekhahlelo e mengata.
Mofuta ona oa boto ea PCB e fihlelang litlhoko tsa boemo ba mollo oa V-1 e fetoha boto ea FR-4.
V-0, V-1, le V-2 ke limaraka tse sa cheng.
Boto ea potoloho e tlameha ho mamella lelakabe, e ke ke ea chesa mocheso o itseng, empa e ka nolofatsoa feela.Sebaka sa mocheso ka nako ena se bitsoa mocheso oa phetoho ea khalase (Tg ntlha), 'me boleng bona bo amana le botsitso ba sebopeho sa boto ea PCB.
Boto ea potoloho e phahameng ea Tg PCB le melemo ea ho sebelisa Tg PCB e phahameng ke efe?
Ha mocheso oa boto e hatisitsoeng ea Tg e phahameng e nyolohela sebakeng se itseng, substrate e tla fetoha ho tloha "boemong ba khalase" ho ea "boemong ba rabara".Mocheso ka nako ena o bitsoa mocheso oa phetoho ea khalase (Tg) ea boto.Ka mantsoe a mang, Tg ke mocheso o phahameng ka ho fetisisa oo substrate e bolokang botsitso.
Ke mefuta efe e khethehileng ea liboto tsa PCB?
E arotsoe ka sehlopha ho tloha tlase ho ea holimo ka tsela e latelang:
94HB - 94VO - 22F - CEM-1 - CEM-3 - FR-4
Lintlha ke tse latelang:
94HB: khateboto e tloaelehileng, eseng e sa chese mollo (thepa e tlase ka ho fetesisa, ho phunya, e ke ke ea sebelisoa e le boto ea phepelo ea motlakase)
94V0: Khateboto e Retardant ea Flame (Die Punching)
22F: Boto ea faeba ea khalase e nang le lehlakore le le leng (ho phunya)
CEM-1: Boto ea fiberglass e nang le lehlakore le le leng (ho cheka komporo hoa hlokahala, eseng ho phunya)
CEM-3: Boto ea fiber e nang le mahlakoreng a mabeli (ntle le karete e nang le mahlakoreng a mabeli, ke thepa e tlaase ka ho fetisisa ea boto e nang le mahlakore a mabeli, e bonolo.
Thepa ena e ka sebelisoa bakeng sa liphanele tse habeli, tse theko e tlase ho 5 ~ 10 yuan/square meter ho feta FR-4)
FR-4: Boto ea fiberglass e mahlakoreng a mabeli
Boto ea potoloho e tlameha ho mamella lelakabe, e ke ke ea chesa mocheso o itseng, empa e ka nolofatsoa feela.Sebaka sa mocheso ka nako ena se bitsoa mocheso oa phetoho ea khalase (Tg ntlha), 'me boleng bona bo amana le botsitso ba sebopeho sa boto ea PCB.
Boto ea potoloho ea Tg PCB e phahameng ke eng le melemo ea ho sebelisa Tg PCB e phahameng.Ha mocheso o nyolohela sebakeng se itseng, substrate e tla fetoha ho tloha "boemong ba khalase" ho ea "boemong ba rabara".
Mocheso ka nako eo o bitsoa mocheso oa phetoho ea khalase (Tg) ea poleiti.Ka mantsoe a mang, Tg ke mocheso o phahameng ka ho fetisisa (°C) oo substrate e bolokang botsitso.Ka mantsoe a mang, lisebelisoa tse tloaelehileng tsa substrate tsa PCB ha li hlahise feela ho nolofatsa, deformation, ho qhibiliha le liketsahalo tse ling ka mocheso o phahameng, empa hape li bontša ho fokotseha ho hoholo ha mekhoa ea mechine le ea motlakase (ke nahana hore ha u batle ho bona lihlopha tsa mapolanka a PCB). 'me u bone boemo bona lihlahisoa tsa hau).
Tg plate e akaretsang e feta likhato tse 130, Tg e phahameng ka kakaretso e feta likhato tse 170, 'me Tg e mahareng e ka ba likhato tse fetang 150.
Hangata mapolanka a hatisitsoeng a PCB a nang le Tg ≥ 170 ° C a bitsoa liboto tse hatisitsoeng tse phahameng tsa Tg.
Ha Tg ea substrate e ntse e eketseha, ho hanyetsa mocheso, ho hanyetsa mongobo, ho hanyetsa lik'hemik'hale, botsitso le litšobotsi tse ling tsa boto e hatisitsoeng li tla ntlafatsoa le ho ntlafatsoa.Ha boleng ba TG bo phahame, ho molemo ho hanyetsa mocheso oa boto, haholo-holo ts'ebetsong e se nang loto, moo likopo tse phahameng tsa Tg li atileng haholo.
Tg e phahameng e bolela ho hanyetsa mocheso o phahameng.Ka tsoelo-pele e potlakileng ea indasteri ea elektronike, haholo-holo lihlahisoa tsa elektronike tse emeloang ke lik'homphieutha, nts'etsopele ea ts'ebetso e phahameng le li-multilayer tse phahameng li hloka ho hanyetsa mocheso o phahameng oa thepa ea substrate ea PCB e le tiiso ea bohlokoa.Ho hlaha le nts'etsopele ea mahlale a phahameng a matla a phahameng a emeloang ke SMT le CMT a entse hore li-PCB li se ke tsa aroloa le ho feta ho ts'ehetso ea mocheso o phahameng oa li-substrates mabapi le lesoba le lenyenyane, lithapo tse ntle, le ho fokotsa.
Ka hona, phapang pakeng tsa kakaretso ea FR-4 le Tg FR-4 e phahameng: e sebakeng se chesang, haholo-holo ka mor'a ho kenngoa ha mongobo.
Tlas'a mocheso, ho na le phapang pakeng tsa matla a mochine, botsitso ba litekanyo, ho khomarela, ho kenngoa ha metsi, ho senyeha ha mocheso, le ho atolosoa ha mocheso oa thepa.Lihlahisoa tse phahameng tsa Tg ho hlakile hore li betere ho feta lisebelisoa tse tloaelehileng tsa substrate tsa PCB.
Lilemong tsa morao tjena, palo ea bareki ba hlokang tlhahiso ea liboto tse hatisitsoeng tse phahameng tsa Tg e eketsehile selemo le selemo.
Ka tsoelo-pele le tsoelo-pele e tsoelang pele ea thekenoloji ea elektronike, litlhoko tse ncha li lula li behiloe pele bakeng sa thepa e hatisitsoeng ea boto ea substrate, ka tsela eo ho khothalletsa tsoelo-pele e tsoelang pele ea litekanyetso tsa koporo tse apereng laminate.Hona joale, litekanyetso tse ka sehloohong tsa thepa ea substrate ke tse latelang.
① Litekanyetso tsa naha Hajoale, maemo a naha ea heso bakeng sa ho hlophisoa ha lisebelisoa tsa PCB bakeng sa substrates li kenyelletsa GB/
T4721-47221992 le GB4723-4725-1992, litekanyetso tsa laminate tsa koporo tsa Taiwan, Chaena ke litekanyetso tsa CNS, tse thehiloeng ho mokhoa oa JIs oa Japane 'me li ile tsa fanoa ka 1983.
②Litekanyetso tse ling tsa naha li kenyelletsa: Litekanyetso tsa Japane tsa JIS, American ASTM, NEMA, MIL, IPc, ANSI, UL standards, British Bs standards, German DIN le VDE standards, French NFC le UTE Standards, le Canadian CSA Standards, Australia's AS standard, ea pele. Tekanyetso ea FOCT ea Soviet Union, maemo a machaba a IEC, joalo-joalo.
Barekisi ba thepa ea mantlha ea moralo oa PCB ba tloaelehile ebile ba sebelisoa hangata: Shengyi \ Jiantao \ International, jj.
● Amohela litokomane: protel autocad powerpcb orcad gerber kapa boto ea sebele ea kopi, joalo-joalo.
● Mefuta ea maqephe: CEM-1, CEM-3 FR4, lisebelisoa tse phahameng tsa TG;
● Boholo bo boholo ba boto: 600mm*700mm (24000mil*27500mil)
● Botenya ba boto ea ho sebetsa: 0.4mm-4.0mm (15.75mil-157.5mil)
● Palo e phahameng ka ho fetisisa ea lihlopha tsa ts'ebetso: 16Layers
● Botenya ba lera la koporo: 0.5-4.0(oz)
● E qetile ho mamella botenya ba boto: +/-0.1mm(4mil)
● Ho mamella boholo ba ho bopa: ho sila ka komporo: 0.15mm (6mil) poleiti ea die punching: 0.10mm (4mil)
● Bophahamo bo fokolang ba mola/sebaka: 0.1mm (4mil) Bokhoni ba ho laola bophara ba mola: <+-20%
● Bonyenyane ba lesoba bophara ba sehlahisoa se felileng: 0.25mm (10mil)
Bonyane bo boholo ba lesoba la sehlahiswa se felilweng: 0.9mm (35mil)
Mamello ea lesoba e felileng: PTH: + -0.075mm(3mil)
NPTH: +-0.05mm(2mil)
● Botenya ba lesoba la lesoba la koporo: 18-25um (0.71-0.99mil)
● Nako e fokolang ea sebaka sa SMT: 0.15mm (6mil)
● Ho roala holim'a metsi: khauta e qoelisoang ka lik'hemik'hale, sefafatsi sa tin, khauta e kentsoeng ka nickel (metsi/khauta e bonolo), sekhomaretsi sa silika se putsoa, joalo-joalo.
● Botenya ba mask a solder holim'a boto: 10-30μm (0.4-1.2mil)
● Matla a ho ebola: 1.5N/mm (59N/mil)
● Ho thatafala ha mask a solder: > 5H
● Solder mask plug lesoba bophahamo ba lesoba: 0.3-0.8mm (12mil-30mil)
● Dielectric kamehla: ε = 2.1-10.0
● Ho hanyetsa mocheso: 10KΩ-20MΩ
● Tšitiso ea sebopeho: 60 ohm±10%
● Tšisinyeho ea mocheso: 288℃, 10 sec
● Warpage ea boto e felileng: <0.7%
● Sesebelisoa sa sehlahisoa: lisebelisoa tsa puisano, lisebelisoa tsa motlakase tsa likoloi, lisebelisoa, tsamaiso ea lefats'e ea boemo, k'homphieutha, MP4, phepelo ea motlakase, lisebelisoa tsa lapeng, joalo-joalo.