Khoov thiab warping ntawm PCB board yog ib qho yooj yim tshwm sim nyob rau hauv lub backwelding rauv. Raws li peb txhua tus paub, yuav ua li cas los tiv thaiv kev khoov thiab sib tsoo ntawm PCB board los ntawm lub qhov cub rov qab tau piav qhia hauv qab no:

1. Txo qhov cuam tshuam ntawm qhov kub thiab txias ntawm PCB pawg thawj coj saib kev ntxhov siab

Txij li thaum "kub" yog qhov tseem ceeb ntawm lub rooj tsavxwm kev ntxhov siab, tsuav yog qhov kub ntawm lub qhov cub reflow txo qis los yog tus nqi ntawm cov cua sov thiab cua txias ntawm lub rooj tsavxwm nyob rau hauv lub qhov cub reflow yog qeeb, qhov tshwm sim ntawm phaj dabtsi yog khoov thiab warping yuav ua tau. txo qis heev. Txawm li cas los xij, lwm yam kev mob tshwm sim tuaj yeem tshwm sim, xws li solder luv Circuit Court.

2. Siv cov ntawv Tg siab

Tg yog lub iav hloov pauv kub, uas yog, qhov kub thiab txias ntawm cov khoom hloov ntawm lub khob iav mus rau lub xeev roj hmab. Qhov qis dua Tg tus nqi ntawm cov khoom, qhov ceev ntawm lub rooj tsavxwm pib softer tom qab nkag mus rau hauv lub reflow furnace, thiab lub sij hawm nws yuav siv sij hawm los ua mos roj hmab lub xeev nws kuj yuav ntev dua, thiab lub deformation ntawm lub rooj tsavxwm yuav yeej yuav hnyav dua. . Siv daim ntawv Tg siab dua tuaj yeem ua rau nws muaj peev xwm tiv taus kev ntxhov siab thiab deformation, tab sis tus nqi ntawm cov khoom kuj tseem siab.

3. Ua kom lub thickness ntawm lub rooj tsavxwm Circuit Court

Yuav kom ua tiav lub hom phiaj ntawm kev sib zog thiab thinner rau ntau yam khoom siv hluav taws xob, lub thickness ntawm lub rooj tsavxwm tau tso tseg 1.0mm, 0.8mm, lossis txawm tias 0.6mm. Xws li ib tug tuab yuav tsum ua kom lub rooj tsavxwm los ntawm deforming tom qab lub reflow rauv, uas yog heev nyuaj. Nws raug pom zoo tias yog tias tsis muaj qhov yuav tsum tau ua kom lub teeb thiab nyias, lub thickness ntawm lub rooj tsavxwm yuav tsum yog 1.6 hli, uas tuaj yeem txo qhov kev pheej hmoo ntawm kev khoov thiab deformation ntawm lub rooj tsavxwm.

4. Txo qhov loj ntawm lub rooj tsav xwm hauv Circuit Court thiab txo cov kev sib tw

Txij li thaum feem ntau ntawm cov reflow furnaces siv chains tsav lub Circuit Court board rau pem hauv ntej, qhov loj ntawm lub Circuit Court board yuav yog vim nws tus kheej hnyav, dent thiab deformation nyob rau hauv lub reflow furnace, yog li sim muab tso rau sab ntev ntawm lub Circuit Court board. raws li tus ntug ntawm lub rooj tsavxwm. Ntawm cov saw hlau ntawm reflow furnace, qhov kev nyuaj siab thiab deformation tshwm sim los ntawm qhov hnyav ntawm lub rooj tsav xwm Circuit Court tuaj yeem txo. Kev txo qis ntawm cov panels kuj yog raws li qhov laj thawj no. Uas yog hais tias, thaum dhau lub cub tawg, sim siv lub nqaim ntug kom dhau lub cub tawg kev taw qhia kom deb li deb tau kom ua tiav qhov qis tshaj plaws ntawm kev nyuaj siab deformation.

5. Siv lub tshuab hluav taws xob siv hluav taws xob

Yog tias cov txheej txheem saum toj no nyuaj rau ua tiav, qhov kawg yog siv cov cab kuj / cov qauv los txo qhov deformation. Yog vim li cas vim li cas lub reflow carrier / template tuaj yeem txo qhov khoov ntawm lub phaj yog vim tias txawm tias nws yog thermal expansion lossis txias contraction, nws cia siab tias lub tais tuaj yeem tuav lub rooj tsav xwm hauv Circuit Court thiab tos kom txog thaum qhov kub ntawm lub rooj tsavxwm Circuit Court qis dua Tg. tus nqi thiab pib tawv dua, thiab tseem tuaj yeem tswj qhov loj ntawm lub vaj.

Yog hais tias ib txheej txheej pallet tsis tuaj yeem txo qhov deformation ntawm lub rooj tsavxwm Circuit Court, yuav tsum tau ntxiv ib lub hau rau clamp lub rooj tsavxwm nrog rau sab sauv thiab sab pallets. Qhov no tuaj yeem txo qhov teeb meem ntawm Circuit Court board deformation los ntawm reflow rauv. Txawm li cas los xij, lub tshuab hluav taws xob no yog qhov kim heev, thiab kev siv tes ua haujlwm yuav tsum tau muab thiab rov ua dua cov tais.

6. Siv Router hloov V-Cut's sub-board

Txij li thaum V-Cut yuav ua kom puas lub zog ntawm lub vaj huam sib luag ntawm lub rooj tsav xwm hauv Circuit Court, sim tsis txhob siv V-Cut sub-board lossis txo qhov tob ntawm V-Cut.