I. Keeb kwm piav qhia
Wave soldering tshuabwelding yog los ntawm cov molten solder ntawm cov khoom siv pins rau daim ntawv thov ntawm solder thiab cua sov, vim hais tias cov txheeb ze zog ntawm lub yoj thiab PCB thiab molten solder "nplaum", yoj soldering txheej txheem yog ntau nyuaj tshaj li reflow soldering, yuav tsum tau soldered pob. tus pin sib nrug, tus pin tawm ntev, ncoo loj yuav tsum tau, ntawm PCB Cov txheej txheem ntawm lub rooj tsavxwm kev taw qhia, qhov sib nrug, nrog rau kev teeb tsa ntawm lub qhov kab kuj muaj qhov yuav tsum tau ua, luv luv, cov txheej txheem nthwv dej tsis zoo, xav tau, vuam yields yeej nyob ntawm tus tsim.
II.Ntim cov cai
1. haum rau yoj soldering qhov chaw yuav tsum tau solder kawg los yog txhuas kawg raug;Pob lub cev los ntawm qhov av clearance (Stand Off) <0.15mm;Qhov siab <4mm qhov yuav tsum tau ua.Ua kom tau raws li cov xwm txheej no ntawm cov khoom tso kawm suav nrog:
0603 ~ 1206 pob loj ntau ntawm cov khoom siv hluav taws xob.
SOP nrog lead center nrug ≥1.0mm thiab qhov siab <4mm.
Chip inductors nrog qhov siab ≤ 4mm.
Tsis-exposed coil nti inductors (piv txwv li C, M hom)
2. haum rau yoj soldering ntawm qhov ntom ntom ntawm ko taw cov khoom siv rau qhov tsawg kawg nkaus ntawm cov pins uas nyob ib sab ≥ 1.75mm pob.
III.Kev taw qhia kis
Ua ntej nthwv dej ntawm qhov sib txuas ntawm qhov chaw, thawj zaug yuav tsum txiav txim siab PCB hla lub qhov cub hluav taws xob kev taw qhia, nws yog qhov kev teeb tsa ntawm cov khoom siv cartridge "cov txheej txheem ntsuas".Yog li ntawd, ua ntej lub nthwv dej ntawm qhov chaw ntawm cov khoom sib txuas, thawj zaug yuav tsum txiav txim siab txog kev xa mus.
1. Feem ntau, sab ntev yuav tsum yog cov kev taw qhia ntawm kev sib kis.
2. Yog hais tias lub layout muaj ib tug kaw ko taw cartridge connector (pitch <2.54mm), layout kev taw qhia ntawm lub connector yuav tsum yog cov kev taw qhia ntawm kis tau tus mob.
3. nyob rau hauv lub yoj soldering nto, yuav tsum tau txhob lo lo ntxhuav-screened los yog tooj liab ntawv ci etched xub cim cov kev taw qhia ntawm kis, thiaj li yuav txheeb xyuas thaum vuam.
IV.Layout kev taw qhia
Cov kev taw qhia layout ntawm cov khoom feem ntau yog cov khoom siv chip thiab ntau tus pin connectors.
1. cov kev taw qhia ntev ntawm SOP cov cuab yeej pob yuav tsum ua tib yam rau cov nthwv dej soldering kis tau tus mob kev taw qhia layout, ntev kev taw qhia ntawm cov nti Cheebtsam, yuav tsum yog perpendicular mus rau yoj soldering kis tau tus mob kev taw qhia.
2. ntau yam khoom siv ob-pin cartridge, lub jack center kab kev taw qhia yuav tsum yog perpendicular mus rau cov kev taw qhia ntawm kis tau tus mob, thiaj li yuav txo tau qhov tshwm sim ntawm ib kawg ntawm cov khoom floating.
V. Qhov yuav tsum tau muaj
Rau cov khoom siv SMD, qhov sib txawv ntawm lub ncoo yog hais txog lub sijhawm nruab nrab ntawm qhov kev nthuav dav siab tshaj plaws ntawm cov pob khoom uas nyob ib sab (nrog rau cov ntaub qhwv);rau cov khoom siv cartridge, qhov sib txawv ntawm lub ncoo yog hais txog lub sijhawm nruab nrab ntawm cov ntaub qhwv.
Rau SMD Cheebtsam, qhov sib nrug ntawm lub ncoo tsis yog tag nrho los ntawm kev sib txuas ntawm tus choj, nrog rau kev cuam tshuam ntawm lub pob lub cev yuav ua rau cov khoom tawg.
1. Cartridge Cheebtsam ncoo ncua sij hawm yuav tsum yog ≥ 1.00mm.rau cov khoom sib txuas zoo zoo, tso cai kom txo qis, tab sis qhov tsawg kawg nkaus yuav tsum tsis txhob <0.60mm.
2. Cartridge tivthaiv pads thiab yoj soldering SMD tivthaiv pads yuav tsum yog ≥ 1.25mm interval.
VI.Pad tsim tshwj xeeb xav tau
1. txhawm rau txo cov dej xau, rau 0805/0603, SOT, SOP, tantalum capacitor pads, nws raug nquahu kom tsim raws li cov cai hauv qab no.
Rau 0805/0603 Cheebtsam, raws li IPC-7351 pom zoo tsim (pad flare 0.2mm, dav txo los ntawm 30%).
Rau SOT thiab tantalum capacitors, cov ntaub qhwv yuav tsum tau nthuav tawm sab nraud los ntawm 0.3mm piv rau cov ntaub qhwv ib txwm tsim.
2. rau metalized qhov phaj, lub zog ntawm lub solder sib koom mas yog nyob rau hauv lub qhov kev twb kev txuas, ncoo nplhaib dav ≥ 0.25mm yuav ua tau.
3. Rau qhov tsis yog-metallized lub phaj (ib lub vaj huam sib luag), lub zog ntawm qhov sib koom ua ke yog txiav txim siab los ntawm qhov loj ntawm lub ncoo, lub taub hau dav dav yuav tsum yog ≥ 2.5 npaug ntawm txoj kab uas hla ntawm lub qhov.
4. rau SOP pob, yuav tsum tau tsim nyob rau hauv qhov kawg ntawm tinned pins nyiag tin pads, yog hais tias lub SOP pitch kuj loj, nyiag tin pad tsim kuj tuaj yeem loj dua.
5. rau multi-pin connectors, yuav tsum tau tsim nyob rau hauv lub off-tin kawg ntawm lub tin pads nyiag.
VII.Ua kom ntev
1. cov hlau lead tawm ntev ntawm kev tsim ntawm tus choj muaj kev sib raug zoo, qhov sib txawv ntawm tus pin me me, qhov cuam tshuam ntau dua ntawm cov lus pom zoo:
Yog hais tias tus pin suab nyob nruab nrab ntawm 2 ~ 2.54mm, cov hlau txuas ntxiv ntev yuav tsum tau tswj ntawm 0.8 ~ 1.3mm
Yog hais tias tus pin pitch <2mm, cov hlau lead txuas ntev yuav tsum tau tswj ntawm 0.5 ~ 1.0mm
2. cov hlau lead tawm ntev tsuas yog nyob rau hauv cov kev taw qhia layout kom tau raws li qhov yuav tsum tau ntawm yoj soldering tej yam kev mob tuaj yeem ua lub luag haujlwm, txwv tsis pub tshem tawm cov nyhuv ntawm kev sib txuas ntawm tus choj tsis pom tseeb.
VIII.daim ntawv thov ntawm solder resist number case
1. peb feem ntau pom ib co connector ncoo graphics txoj hauj lwm luam nrog number case graphics, xws li ib tug tsim feem ntau xav kom txo tau qhov tshwm sim ntawm bridging.Cov txheej txheem yuav yog tus number case txheej saum npoo yog qhov ntxhib, yooj yim rau adsorb ntau flux, flux ntsib nrog kub kub molten solder volatilization thiab tsim ntawm kev sib cais npuas, yog li txo qhov tshwm sim ntawm bridging.
2. Yog hais tias qhov kev ncua deb ntawm tus pin pads <1.0mm, koj tuaj yeem tsim lub solder tiv thaiv number case txheej sab nraum lub ncoo kom txo tau qhov tshwm sim ntawm bridging, uas feem ntau tshem tawm cov ntaub qhwv ntom ntom ntawm nruab nrab ntawm qhov sib koom ua ke, thiab tub sab ntawm tin. pads tsuas yog tshem tawm cov pawg tuab tuab kawg desoldering kawg ntawm cov sib koom ua ke bridging lawv cov haujlwm sib txawv.Yog li ntawd, rau tus pin ncua yog qhov me me ntom ntom ntom ntom, solder tiv mem kua thiab tub sab nyiag khoom ntawm cov quav solder yuav tsum tau siv ua ke.
Post lub sij hawm: Dec-14-2021