SMT Stencil: Gwaro Rakakwana reMarudzi, Maparamita, uye Sarudzo

1. Nhanganyaya — Tsanangura SMT Stencil Nebasa Rayo

Chii chinonzi SMT Stencil?

Stencil yeSMT itemplate yesimbi yakatetepa inoshandiswa muhunyanzvi hwekuisa solder paste pamaPCB pads nemazvo. Kazhinji inogadzirwa nesimbi isingatsvedzi, stencil iyi ine maburi akachekwa nelaser anoenderana nehurongwa hwemapepa ebhodhi redunhu. Munguva yekudhinda, solder paste inoiswa pamusoro pestencil uye inomanikidzwa nepakati pemaburi aya kuenda pabhodhi riri pazasi.

Nei SMT Stencils Inokosha MuPCB Assembly

Stencil yeSMT inoshanda basa rakakosha muchikamu chekudhinda che solder paste, izvo zvinopesvedzera zvakananga kunaka kwekupedzisira kwe solder joint. Stencil dzakagadzirwa zvakanaka dzinovimbisa huwandu hwe paste hwakafanana pama pads ese, zvichideredza zvikanganiso zvakajairika zvakaita sekubatanidza, kusakwana kwe solder, uye kugadzira matombo eguva. Kuti pagadzirwe zvakawanda uye pave ne fine-pitch component, kunyatsoita stencil kunokosha kuti pave nemhedzisiro yakavimbika uye inodzokororwa.

2. Mhando dzeSMT Stencil — Kurongwa uye Mashandisirwo

Stencil yeSMT ine Furemu

Stencil yeSMT yakafurwa inoiswa mukati mefuremu yealuminium yakasimba pasi pekumanikidzwa kwakarongeka. Kugadziriswa uku kunoita kuti pave nekugadzikana kwakanyanya uye kurongeka kwakarurama panguva yekudhinda otomatiki, zvichiita kuti ive sarudzo inosarudzwa yemitsetse yekugadzira yakawanda. Furemu iyi inochengetedza kumanikidzwa kwakafanana pamusoro pestencil, zvichiita kuti paste irambe yakabatana. Zvisinei, mastencil akafurwa anoda nzvimbo yakawanda yekuchengetera uye anosanganisira mari yakawanda yekutanga.

Stencil yeSMT isina Frame

Mastencil eSMT asina Frameless anopa imwe nzira inodhura yekugadzira ma prototypes uye kugadzira zvinhu zvishoma. Pasina furemu inogara kwenguva refu, mastencil aya akareruka, ari nyore kuchengeta, uye anogona kugadziriswa nekukurumidza kuti aenderane nemagadzirirwo akasiyana ePCB . Anoshanda nema universal tensioning systems kana manual printing setups. Frameless options dzakakodzera zvikuru vagadziri vemagetsi vanobata maodha akasiyana-siyana, madiki-diki.

Stencil yedanho

Stencil ine ukobvu hwakawanda patemplate imwe chete, inogadzirwa kuburikidza nekusarudza etching kana electroforming. Dhizaini iyi inokwana maPCB ane zvinodiwa zvakasiyana-siyana—inopa paste yakawanda kune ma connectors makuru uku ichideredza vhoriyamu ye fine-pitch ICs pabhodhi rimwe chete. Stencil dzematanho dzakakosha pakubatanidza kwakaoma uko hukobvu hwakaenzana husingakwanirise mapedhi ese.

3. Magadzirirwo eSMT Stencil — Zvinokosha zveTechnical

Kukora kweStencil Kunokanganisa Sei Vhoriyamu yePaste

Ukobvu hwemastencil hunotarisa zvakananga huwandu hwechipunu chinosungirirwa papedhi rega rega. Mastencil akakora anotamisa chipunu chakawanda, chakakodzera zvikamu zvikuru zvinoda majoini akasimba echipunu. Sarudzo dzakajairika dzeukobvu dzinotangira pa0.1mm kusvika pa0.2mm, uye 0.12mm ndiyo yakajairika kumabhodhi mazhinji emhando dzakasiyana. Zvikamu zvechipunu chinopenya zvishoma (0.4mm pitch kana pasi) zvinowanzoda mastencil akatetepa kudzivirira kusangana.

Kusarudza Ukobvu Hwakakodzera

Kusarudza ukobvu hwakakodzera hwestencil kunoda kuyera zvikamu zvidiki uye zvikuru paPCB yako. Kana kusiyana kwehukuru hwepedhi kwakakosha, stencil inodzika kana kuti ukobvu hwenzvimbo yacho hunogona kudiwa. Chinangwa ndechekuwana mukana wekubvisa paste yakakwana yenzvimbo dzese uku uchichengetedza huwandu hwakakwana hwenzvimbo dzakavimbika dzesolder joints mushure mekudzokororwa.

Zvinhu zveSMT Stencil

Simbi isina ngura ichiri chinhu chinonyanya kushandiswa pakugadzira maSMT stencils nekuda kwekugara kwayo kwenguva refu, kuramba ngura, uye kushanda zvakanaka nekucheka nelaser. Mazhinji emastencils ekugadzira anoshandisa 300-series stainless steel, iyo inopa hunhu hwakanaka hwekupfekwa kwemavara akawanda ekudhinda. Kupera kwepamusoro kwakatsetseka kunoita kuti paste ibude yakachena uye ive nyore kuchenesa pakati pekudhinda.

Kuenzanisa Zvinhu: Simbi, Nickel, uye Polymer

Mastencil enickel akaumbwa nemagetsi anoita kuti madziro avhure zvakanaka uye anonyanya kufarirwa pakushandiswa kwepitch yakapfava zvikuru uko kuburitsa paste kwakakosha. Mastencil epolymer anopa sarudzo yakaderera yekunyora kana kuti mapfupi asi haagari kwenguva refu. Kusarudzwa kwezvinhu kunosanganisira kuchinjana pakati pezvinodiwa nemazvo, huwandu hwekugadzira, uye bhajeti shoma.

Dhizaini yeSaizi yeAperture

Zviyero zveAperture zvinofanirwa kuenderana nemagadzirirwo ePCB pad kuti pave nechokwadi chekuti paste yakavharwa zvakanaka. Maburi makuru anokonzera paste yakawandisa uye mukana wekuvharira; maburi mashoma anokonzera kusakwana kwe solder uye majoini asina kusimba. Maitiro akajairika anosanganisira kuderedza saizi yeaperture zvishoma (kazhinji 10-20%) zvichienzaniswa nehukuru hwepad kuti zviverengere kupararira kwepaste panguva yekufamba kwe squeegee.

Kufunga Nezvehuwandu hwenzvimbo uye chiyero cheaspect

Mitemo yeindasitiri inokurudzira kuchengetedza chiyero chenzvimbo (nzvimbo yekuvhura yakakamurwa nenzvimbo yemadziro) pamusoro pe0.66 kuti paste ibudiswe zvakanaka. Chiyero cheaperture (upamhi hweaperture hwakakamurwa nehukobvu hwestencil) chinofanira kudarika 1.5. Aya ma metrics, anotaurwa muIPC-7525, anobatsira mainjiniya kufanotaura kana paste ichafamba zvakanaka kubva pastencil kuenda kune pad panguva yekudhinda.

4. Kusarudzwa kweSMT Stencil Kunokanganisa Sei Hunhu hwePCB Assembly

Mhedzisiro paHunhu hweSolder Joint

Kusarudzwa kwakakodzera kweSMT stencil kunoderedza zvakananga zvikanganiso zve solder nekuona kuti paste yakawanda zvakakwana pahukuru hwema pad ese. Kugara uchiisa stencil kunoderedza kubatanidza mapini ari pedyo uye kudzivirira kutonhora kana kusakwana kwema solder joints. Pamamiriro ekugadzira, dhizaini chaiyo ye stencil inoshandura goho rekutanga rakakwira uye kuderedza mari yekugadzirisa.

Kusarudzwa kweStencil yeKusangana Kwakanyatsonaka

Mabhodhi ane huwandu hwakanyanya hwezvinhu zvine zvidimbu zvakapfava anoda kunyatsotsanangurwa kwestencil. Zvinhu zvinosanganisira kukwirira kwevhu, kutsvedzerera kwemadziro, uye kufanana kweukobvu zviri kuramba zvichikosha sezvo nzvimbo yezvikamu ichiderera. Kuenzanisa ma parameter estencil nekugadzirwa kwakaoma kunoita kuti paste ibude zvakanaka uye kunotsigira kudzokorora kunodiwa pakugadzira vhoriyamu.

5. Njodzi Dzinowanzoonekwa Uye Zvaunofanira Kufunga Nezvekuita

Zvikanganiso Zvakajairika Mukushandiswa KweSMT Stencil

Zvikanganiso zvinowanzo sanganisira kusarongeka pakati pemaburi estencil nemaPCB pads , kusarudzwa kweukobvu husina kunaka kwemusanganiswa wezvikamu, uye kusakwana kwehurongwa hwekuchenesa. Kushandisa mastencil akakuvara kana akasakara kunoita kuti paste irambe isina kurongeka. Kukundikana kusimbisa data regerber zvichienderana nehukuru hwemapedhi chaiwo usati wagadzira stencil kunokonzera zvikanganiso zvekudhinda.

Mazano Anoshanda Ekudhinda Kwakavimbika

Gadza nguva dzekuchenesa stencil zvichienderana nerudzi rwekunama uye mashandisirwo ekudhinda. Chengetedza kumanikidzwa kwakakodzera uye mafambiro ekumhanya kuti uwane mhedzisiro yakafanana. Tarisa kusimba kwestencil usati watanga kugadzira, kunyanya pakugadzirisa ma frame. Ongorora data repaste layer panguva yekugadzira kuti ubate matambudziko ehukuru hwe aperture usati watanga kugadzira.

6. pfupiso

Stencil yeSMT chinhu chakakosha pakuumbwa kwesimbi pamusoro pechinhu , ichinyatso batsira pakunyatsorongeka kwekuisa simbi yesolder paste uye kunaka kwekubatana kwesimbi. Kunzwisisa musiyano uripo pakati pemagadzirirwo estencil ane furemu, asina furemu, uye step stencil kunoita kuti pave nesarudzo yakakodzera yezvinodiwa pakugadzira. Zvinhu zvakakosha—ukobvu, zvinhu, uye dhizaini yeaperture—zvinofanirwa kugadziriswa zvichienderana nekuomarara kwePCB uye zvinodiwa nezvikamu.

Kusarudza mastencil nemazvo kunoderedza zvikanganiso, kunovandudza kugadzikana kwegoho, uye kunotsigira kugadzirwa kwakanaka kwehuwandu hwakawanda. Nekudzivirira matambudziko akajairika uye kutevedzera nhungamiro dzakagadzirwa, vagadziri vanogona kuwedzera mashandiro ekudhinda kwavo solder paste uye kuwana mhedzisiro yakavimbika yekubatanidza.