Raws li peb txhua tus paub, PCB yog qhov yooj yim rau khoov thiab warping thaum dhau los ntawm qhov cub reflow.Yuav ua li cas tiv thaiv PCB los ntawm dabtsi yog khoov thiab warping thaum dhau los ntawm reflow qhov cub yog piav qhia hauv qab no
1. Txo qhov ntsuas kub ntawm PCB kev ntxhov siab
Txij li thaum "kub" yog lub hauv paus tseem ceeb ntawm phaj kev ntxhov siab, tsuav yog qhov kub ntawm reflow rauv txo qis los yog cua sov thiab cua txias ntawm phaj hauv reflow rauv yog qeeb, qhov tshwm sim ntawm phaj dabtsi yog khoov thiab warping yuav txo tau zoo heev.Txawm li cas los xij, tej zaum yuav muaj lwm yam kev mob tshwm sim, xws li solder luv Circuit Court.
2. Txais siab TG phaj
TG yog lub iav hloov pauv kub, uas yog, qhov kub ntawm cov khoom hloov pauv los ntawm lub xeev iav mus rau lub xeev rubberized.Qhov qis TG tus nqi ntawm cov khoom siv, lub phaj nrawm dua pib softer tom qab nkag mus rau hauv lub reflow furnace, thiab lub sij hawm ntev dua los ua cov mos rubberized lub xeev, qhov loj dua qhov deformation ntawm lub phaj.Lub peev xwm ntawm bearing kev ntxhov siab thiab deformation tuaj yeem nce los ntawm kev siv lub phaj nrog ntau dua TG, tab sis tus nqi ntawm cov khoom kuj yog siab.
3. Ua kom lub thickness ntawm lub rooj tsavxwm
Ntau cov khoom siv hluav taws xob kom ua tiav lub hom phiaj ntawm thinner, lub thickness ntawm lub rooj tsavxwm tau tso tseg 1.0 hli, 0.8 hli, los yog txawm 0.6 hli, xws li cov thickness kom lub rooj tsavxwm tom qab reflow furnace tsis deform, nws yog tiag tiag me ntsis. nyuaj, nws tau pom tias yog tias tsis muaj qhov yuav tsum tau nyias nyias, lub rooj tsavxwm tuaj yeem siv 1.6 hli thickness, uas tuaj yeem txo qhov kev pheej hmoo ntawm kev khoov thiab deformation.
4. Txo qhov loj ntawm lub rooj tsav xwm hauv Circuit Court thiab tus naj npawb ntawm cov vaj huam sib luag
Txij li feem ntau cov reflow ncu siv chains los tsav lub Circuit Court boards rau pem hauv ntej, qhov loj ntawm lub Circuit Court board, qhov ntau concave nws yuav nyob rau hauv lub reflow cub vim nws tus kheej qhov hnyav.Yog li ntawd, yog hais tias lub sab ntev ntawm lub rooj tsavxwm Circuit Court yog muab tso rau ntawm lub saw ntawm lub reflow qhov cub raws li lub ntug ntawm lub rooj tsavxwm, lub concave deformation tshwm sim los ntawm qhov hnyav ntawm lub rooj tsavxwm Circuit Court yuav raug txo, thiab tus naj npawb ntawm cov boards yuav txo tau. Qhov no yog vim li cas, Uas yog hais tias, thaum lub cub tawg, sim siv lub nqaim sab perpendicular mus rau cov kev taw qhia ntawm lub cub tawg, muaj peev xwm ncav cuag tsawg sag deformation.
5. Siv lub pallet fixture
Yog tias tag nrho cov txheej txheem saum toj no nyuaj rau kev ua tiav, Nws yog siv cov cab kuj / qauv los txo qhov deformation.Yog vim li cas reflow carrier / template yuav txo tau qhov khoov thiab warping ntawm lub rooj tsavxwm yog hais tias txawm hais tias nws yog thermal expansion los yog txias contraction, lub tais yuav tsum tuav lub Circuit Court board.Thaum qhov kub ntawm lub rooj tsavxwm Circuit Court yog qis dua TG tus nqi thiab pib tawv dua, nws tuaj yeem tswj tau qhov loj me.
Yog tias lub tais ib txheej tsis tuaj yeem txo qhov deformation ntawm lub rooj tsav xwm hauv Circuit Court, peb yuav tsum ntxiv ib txheej ntawm lub hau kom clamp lub rooj tsavxwm nrog ob txheej ntawm cov tais, uas tuaj yeem txo qhov deformation ntawm Circuit Court board los ntawm qhov cub reflow.Txawm li cas los xij, qhov cub lub tais no kim heev, thiab tseem yuav tsum tau ntxiv phau ntawv rau qhov chaw thiab rov ua dua lub tais.
6. Siv router hloov V-CUT
Txij li thaum V-CUT yuav ua rau lub zog ntawm cov khoom siv hluav taws xob puas tsuaj, sim tsis txhob siv V-CUT cais lossis txo qhov tob ntawm V-CUT.
Post lub sij hawm: Jun-24-2021