SMT yekugadzira michina yakanyatsoita otomatiki, yakakwira kunyatsoita, kumhanya kwazvo, kugona kwakanyanya uye zvichingodaro. PCB dhizaini inofanirwa kusangana nezvinodiwa zvemidziyo yeSMT. Iyo dhizaini yezvinodiwa zveSMT zvigadzirwa zvekugadzira zvinosanganisira: pcb chimiro, saizi, yekumisikidza gomba uye yekukochekera kumucheto, revo Mako, kuunganidza bhodhi, kusarudzwa kwechinhu kurongedza uye kurongedza fomu, pcb dhizaini kuburitsa faira, nezvimwe.

Paunenge uchigadzira PCB, chimiro chePCB chinofanira kutarisirwa pakutanga. When kukura kwePCB kwakanyanya, mutsetse wakadhindwa wakareba, iyo impedance inowedzera, iyo yekurwisa-ruzha kugona inoderera, uye mutengo unowedzera. Zvidiki kwazvo, kupisa kupisa hakuna kunaka, uye mitsara iri padhuze inogona kupindirwa. Panguva imwecheteyo, iko kurongeka uye kutsanangurwa kwePCB chimiro dhizaini zvinokanganisa kugadzirwa uye hupfumi hwekugadzira nekugadzirisa. Huru zvemukati pcb chimiro dhizaini zvinotevera.

(1) Kureba-upamhi reshiyo dhizaini

Yakadhindwa bhodhi chimiro chinofanirwa kuve chakareruka sezvinobvira, kazhinji rectangular, kureba kusvika pahupamhi reshiyo ye3: 2 kana 4: 3, saizi yayo inofanirwa kunge iri padhuze neyakajairwa akateedzana saizi, kuitira kurerutsa kugadzirisa ini hunyanzvi, kudzora kugadzirisa mitengo. Icho chepamusoro pebhodhi hachifanirwe kunge chakakomberedzwa chakakura kwazvo, kuti chisakonzere deformation kana uchinge wadzosera mutserendende. Saizi uye ukobvu hwebhodhi zvinofanirwa kuenderana, yakatetepa pcb, bhodhi saizi haifanire kunge yakanyanya kukura.

Ndezvipi zvinodiwa zvePCB dhizaini yeSMT yekugadzira michina

(2) pcb chimiro

Pcb chimiro uye saizi zvinotsanangurwa nePCB yekuparadzira modhi uye nekumisikidza renji yekumisikidza muchina.

① Kana Iyo pcb yakaiswa panzvimbo yekusimudza bhenji uye ichitamiswa kuburikidza nebhenji rebasa, hapana chakakosha chinodiwa pakuonekwa kwePCB.

② Kana iyo pcb ikatapurirana zvakananga nechitima, chimiro chePCB chinofanira kuve chakatwasuka. Kana iri profiled pcb, iyo nzira yekumucheto inofanirwa kuve yakagadzirirwa kuitira kuti kunze kwePCB igadzire yakatwasuka mutsara, sezvakaratidzwa muMufananidzo 5-80.

③ Mufananidzo 5-81 inoratidza PCB makona akapoteredzwa kana makumi mana. Chamfering dhayagiramu. Mune pcb chimiro dhizaini, zvakanakira kugadzirisa iyo PCB mumakona akapoteredzwa kana makumi mashanu. Chamfer kudzivirira inopinza Angle kukuvara kune pcb yekufambisa bhandi (fiber bhandi).

(3) pcb saizi dhizaini

Pcb saizi inotemwa nekukwira renji. Paunenge uchigadzira pcb, zvinodikanwa kuti utarise huwandu uye hushoma hunowedzera saizi yemuchina unosimudza. Pcb yekupfuura saizi = hukuru hwekuwedzera saizi yekumisikidza muchina; Minimum pcb saizi = kushoma kwekuwedzera saizi yekumisikidza muchina. Mhando yekumisikidza yemhando dzakasiyana dzekusimudza michina dzakasiyana. Kana saizi pcb iri diki pane iyo saizi yekuwedzera saizi, iyo bhodhi inofanira kushandiswa.

(4) pcb ukobvu dhizaini

Kazhinji, kukora kweplate kwakatenderwa nemuchina wekumisikidza ndeye 0.5 ~ Smm. Ukobvu hwePCB hunowanzo kuverengera 0.5-2mm.

① Ingo unganidza maseketi akasanganiswa, akaderera-simba ma transistors, maresitor, ma capacitor uye zvimwe zvakaderera-simba zvikamu, mukushomeka kwakasimba mutoro vibration mamiriro, saizi yePCB mukati me500mmx500mm, iko kushandiswa kwehukuru hwe1.6mm.

② Pasi pemamiriro ekutakurwa kwemutoro, saizi yeplate inogona kudzikiswa kana nzvimbo inotsigira inogona kusimbiswa kana kuwedzerwa, uye ukobvu hwe1.6mm hunogona kushandiswa.

③ Kana iyo ndiro pamusoro kana yakakura kana kusakwanisa kutsigira, 2-3mm gobvu ndiro inofanira kusarudzwa.