"Dent" yog tshwm sim los ntawm lub hauv paus hauv zos shrinkage tom qab lub qhov rooj kaw los yog tsis muaj cov khoom txhaj tshuaj.Cov kev nyuaj siab los yog micro kev nyuaj siab nyob rau saum npoo ntawmtxhaj tshuaj molded qhov chawyog ib qho teeb meem qub hauv kev txhaj tshuaj molding.
Cov dents feem ntau tshwm sim los ntawm kev nce hauv zos ntawm shrinkage tus nqi ntawm cov khoom yas vim qhov nce ntawm phab ntsa thickness ntawm cov khoom yas.Tej zaum lawv yuav tshwm sim ze rau sab nraud ntawm cov ces kaum ntse ntse los yog tam sim ntawd hloov ntawm phab ntsa tuab, xws li sab nraub qaum, stiffeners lossis bearings, thiab qee zaum ntawm qee qhov tsis tshua muaj.Lub hauv paus ua rau dents yog thermal expansion thiab txias contraction ntawm cov ntaub ntawv, vim hais tias lub thermal expansion coefficient ntawm thermoplastics yog heev.
Qhov luaj li cas ntawm kev nthuav dav thiab kev cog lus nyob ntawm ntau yam, ntawm qhov kev ua haujlwm ntawm cov yas, qhov siab tshaj plaws thiab qhov ntsuas kub tsawg kawg nkaus thiab kev tswj xyuas qhov siab ntawm pwm kab noj hniav yog qhov tseem ceeb tshaj plaws.Qhov loj thiab cov duab ntawmyas qhov chaw, nrog rau qhov txias ceev thiab qhov sib xws kuj tseem cuam tshuam rau yam.
Tus nqi ntawm kev nthuav dav thiab kev cog lus ntawm cov ntaub ntawv yas hauv cov txheej txheem molding yog cuam tshuam nrog thermal expansion coefficient ntawm cov txheej txheem yas.Lub thermal expansion coefficient nyob rau hauv cov txheej txheem molding yog hu ua "moulding shrinkage".Nrog rau qhov txias shrinkage ntawm molded ib feem, lub molded ib feem poob kev sib cuag nrog lub txias nto ntawm pwm kab noj hniav.Nyob rau lub sijhawm no, qhov ua kom txias txias txo qis.Tom qab lub molded ib feem tseem txias, lub molded ib feem tseem ntsws.Tus nqi ntawm shrinkage nyob ntawm qhov sib xyaw ua ke ntawm ntau yam.
Lub kaum ntse ntse ntawm qhov molded txias qhov ceev tshaj plaws thiab tawv ua ntej tshaj lwm qhov chaw.Qhov tuab nyob ze ntawm qhov nruab nrab ntawm qhov molded yog qhov deb tshaj plaws ntawm qhov chaw txias ntawm cov kab noj hniav thiab dhau los ua qhov kawg ntawm qhov molded ib feem kom tso cua sov.Tom qab cov khoom ntawm cov ces kaum yog kho, qhov molded ib feem yuav txuas ntxiv mus raws li cov yaj nyob ze ntawm qhov chaw ntawm qhov chaw txias.Lub dav hlau nruab nrab ntawm cov kaum ntse ntse tsuas tuaj yeem ua kom txias unilaterally, thiab nws lub zog tsis siab npaum li cov khoom ntawm cov ces kaum ntse.
Cov cua txias shrinkage ntawm cov khoom yas ntawm qhov nruab nrab ntawm qhov rub tawm qhov chaw tsis muaj zog ntawm qhov txias txias thiab lub kaum ntse ntse nrog ntau dua qhov cua txias sab hauv.Nyob rau hauv no txoj kev, ib tug dent yog generated nyob rau saum npoo ntawm txhaj molded ib feem.
Lub hav zoov ntawm cov dents qhia tias cov molding shrinkage ntawm no yog siab tshaj qhov shrinkage ntawm nws cov nyob ib puag ncig.Yog hais tias lub shrinkage ntawm molded ib feem ntawm ib qhov chaw siab tshaj qhov uas nyob rau hauv lwm qhov chaw, yog vim li cas rau lub warpage ntawm molded ib feem.Qhov kev ntxhov siab nyob hauv cov pwm yuav txo qhov cuam tshuam lub zog thiab kub tsis kam ntawm cov pwm pwm.
Qee zaum, cov hniav tuaj yeem zam tau los ntawm kev kho cov txheej txheem.Piv txwv li, thaum lub sij hawm lub siab tswj txheej txheem ntawm molded ib feem, ntxiv cov khoom yas yog txhaj rau hauv pwm kab noj hniav kom them rau lub molding shrinkage.Feem ntau, lub rooj vag yog thinner dua li lwm qhov ntawm qhov chaw.Thaum lub molded ib feem tseem kub heev thiab txuas ntxiv mus, lub rooj vag me me tau kho.Tom qab kho, lub siab tuav tsis muaj qhov cuam tshuam rau qhov molded hauv kab noj hniav.
Post lub sij hawm: Nov-15-2022