Dab tsi yog qhov tseem ceeb ntawm kev txhaj tshuaj pwm?

Mainstream
Nws yog ib feem ntawm cov channel txuas cov tshuaj nozzle ntawm lub tshuab txhaj tshuaj mus rau txoj kab sib txawv los yog kab noj hniav hauv pwm. Sab saum toj ntawm lub ntsiab channel yog concave mus txuas nrog lub nozzle. Txoj kab uas hla ntawm lub ntsiab channel inlet yuav tsum yog me ntsis loj dua lub nozzle txoj kab uas hla (0.8mm) kom tsis txhob overflow thiab tiv thaiv qhov thaiv ntawm ob vim yog kev twb kev txuas tsis raug. Txoj kab uas hla ntawm qhov nkag yog nyob ntawm qhov loj ntawm cov khoom, feem ntau 4-8mm. Txoj kab uas hla ntawm tus khiav lub ntsiab yuav tsum tau nthuav mus rau sab hauv ntawm lub kaum sab xis ntawm 3 degree mus rau 5 degree kom yooj yim rau demoulding ntawm tus khiav.
Nws yog kab noj hniav nyob rau hauv qhov kawg ntawm lub ntsiab ntws ntws mus ntes cov khoom txias uas tsim los ntawm ob qho kev txhaj tshuaj ntawm qhov kawg ntawm lub nozzle, thiaj li tiv thaiv cov blockage ntawm txoj kev nkag los yog lub rooj vag. Yog tias cov khoom txias sib xyaw rau hauv pwm kab noj hniav, kev ntxhov siab sab hauv yuav yooj yim tshwm sim hauv cov khoom. Txoj kab uas hla ntawm lub qhov dej txias yog li ntawm 8-10mm, thiab qhov tob yog 6mm. Txhawm rau kom yooj yim demoulding, nws cov hauv qab feem ntau yog los ntawm tus pas nrig demoulding. Sab saum toj ntawm demoulding pas nrig yuav tsum tau tsim raws li ib tug zigzag nuv zoo los yog teem nrog ib tug sinking groove, thiaj li hais tias lub ntsiab channel yuav rub tawm smoothly thaum lub sij hawm demoulding.
Shunt
Nws yog cov channel txuas lub ntsiab channel thiab txhua kab noj hniav nyob rau hauv multi-groove tuag. Txhawm rau ua kom cov khoom molten sau txhua qhov kab noj hniav ntawm qhov sib npaug ntawm qhov sib npaug, kev teeb tsa ntawm cov channel shunting ntawm cov pwm yuav tsum sib npaug thiab sib npaug. Cov duab thiab qhov luaj li cas ntawm cov khoom sib tw muaj feem cuam tshuam rau qhov ntws ntawm cov yas yaj, qhov nyuaj ntawm cov khoom demoulding thiab pwm tsim. Yog hais tias tus nqi ntws yog sib npaug, qhov tsis kam ntawm cov dej ntws nrog lub voj voog yog qhov tsawg tshaj plaws. Txawm li cas los xij, vim tias qhov tshwj xeeb ntawm cov cylindrical khiav yog me me, nws tsis zoo rau qhov txias ntawm cov neeg khiav dej num cov khib nyiab, thiab cov neeg khiav dej num zoo li no yuav tsum tau qhib rau ntawm ob sab ntawm cov pwm, uas yog kev siv zog ntau thiab yooj yim rau kev sib dhos.
Yog li ntawd, tus khiav nrog trapezoidal los yog semicircular seem feem ntau yog siv, thiab nws yog teem rau ntawm ib nrab pwm nrog lub tso pas nrig. Cov neeg khiav dej num yuav tsum tau polished kom txo tau qhov khiav tsis kam thiab muab pwm ua kom nrawm dua. Qhov loj ntawm tus khiav yog nyob ntawm hom yas, qhov loj thiab tuab ntawm cov khoom. Rau feem ntau cov thermoplastics, qhov dav ntawm txoj kab sib txawv tsis ntau tshaj 8 m, qhov loj tuaj yeem ncav cuag 10-12 m, thiab cov me me tuaj yeem ncav cuag 2-3m. Nyob rau ntawm qhov chaw ua tau raws li qhov xav tau, thaj chaw seem yuav tsum raug txo kom ntau li ntau tau kom tsis txhob ua kom lub nra ntawm txoj kev hloov pauv thiab ua kom lub sijhawm txias.
Rooj vag
Nws yog channel txuas lub ntsiab channel (los yog shunt channel) thiab kab noj hniav. Qhov chaw hla ntu ntawm cov channel tuaj yeem sib npaug ntawm lub ntsiab ntws channel (lossis hloov pauv channel), tab sis feem ntau nws txo qis. Yog li ntawd, nws yog qhov tsawg tshaj plaws nyob rau hauv tag nrho cov ntws channel system. Cov duab thiab qhov loj ntawm lub rooj vag muaj kev cuam tshuam zoo rau cov khoom zoo.
Lub luag haujlwm ntawm rooj vag yog:
A. Tswj cov khoom ntws ceev:
B. Backflow tuaj yeem tiv thaiv tau thaum txhaj tshuaj vim thaum ntxov solidification ntawm cov khoom molten khaws cia hauv qhov no:
C. Ua kom cov khoom siv molten dhau los ua kom muaj zog shearing thiab nce qhov kub, yog li txo qhov pom tseeb viscosity thiab txhim kho fluidity:
D. Nws yog qhov yooj yim los cais cov khoom los ntawm cov dej ntws channel. Qhov tsim ntawm lub rooj vag zoo, qhov loj thiab qhov chaw nyob ntawm qhov xwm txheej ntawm cov yas, qhov loj thiab cov qauv ntawm cov khoom. Feem ntau, qhov seem ntawm lub rooj vag yog cov duab plaub lossis voj voog, qhov seem yuav tsum me me thiab qhov ntev yuav tsum luv. Qhov no tsis yog tsuas yog raws li cov haujlwm saum toj no xwb, tab sis kuj vim tias nws yooj yim rau lub rooj vag me me kom loj dua, thaum nws nyuaj rau lub rooj vag loj kom txo tau. Feem ntau, lub rooj vag txoj hauj lwm yuav tsum tau xaiv ntawm qhov chaw uas cov khoom yog thickest thiab tsis cuam tshuam rau cov tsos. Qhov tsim ntawm lub rooj vag loj yuav tsum coj mus rau hauv tus account qhov xwm ntawm cov yas yaj.
Nws yog qhov chaw rau kev tsim cov khoom yas hauv pwm. Cov khoom siv los ua cov kab noj hniav yog sib sau ua ke hu ua molded qhov chaw. Txhua qhov molding feem ntau muaj lub npe tshwj xeeb. Cov khoom tsim uas tsim cov duab ntawm cov khoom yog hu ua poj niam pwm (tseem hu ua poj niam pwm), thiab cov khoom uas tsim cov duab puab ntawm cov khoom (xws li qhov, grooves, thiab lwm yam) yog hu ua core lossis txiv neej pwm (tseem. hu ua txiv neej pwm). Thaum tsim molded qhov chaw, tag nrho cov qauv ntawm cov kab noj hniav yuav tsum tau txiav txim siab ua ntej raws li kev ua tau zoo ntawm cov yas, cov duab geometric ntawm cov khoom, qhov ntev ntev thiab kev siv yuav tsum tau ua.
Secondly, according to the determined structure, the position of parting surface, gate and vent hole and the demoulding mode are selected. Finally, the design of each part and the combination mode of each part are determined according to the size of the control part. The plastic melt has a high pressure when entering the mold cavity, so the molding parts should be reasonably selected and checked for strength and stiffness. In order to ensure the smooth and beautiful surface of plastic products and easy demoulding, the surface in contact with plastic should have a roughness of Ra>0.32um thiab corrosion resistant. Cov khoom tsim feem ntau yog ua los ntawm corrosion-resistant steel los ntawm kev kho cua sov los txhim kho hardness.
Exhaust chaw nres nkoj
Nws yog lub qhov hluav taws xob grooved qhib rau hauv pwm kom tso tawm cov roj qub thiab cov roj coj los ntawm cov khoom siv molten. Thaum cov khoom molten raug txhaj rau hauv pwm kab noj hniav, cov huab cua qub tau khaws cia rau hauv pwm kab noj hniav thiab cov roj uas coj los ntawm cov yaj yuav tsum tau tawm ntawm cov pwm los ntawm qhov chaw nres nkoj ntawm qhov kawg ntawm cov khoom ntws, txwv tsis pub cov khoom yuav muaj qhov pores, tsis zoo fusion, tsis txaus pwm filling, thiab txawm tias cov huab cua sib xyaw yuav hlawv cov khoom vim qhov kub thiab txias tsim los ntawm compression.
Feem ntau, lub qhov tso pa tawm tuaj yeem nyob rau ntawm qhov kawg ntawm cov khoom molten ntws hauv cov pwm kab noj hniav lossis ntawm qhov seem ntawm cov pwm yas. Lub tom kawg yog qhib ib tug ntiav zawj nrog qhov tob ntawm 0.03-0.2mm thiab dav ntawm 1.5-6mm ntawm ib sab ntawm lub concave tuag. Thaum lub sij hawm txhaj tshuaj, yuav tsis muaj ntau cov khoom molten seeping tawm ntawm lub qhov cua, vim hais tias cov khoom molten yuav txias thiab solidify muaj thiab thaiv cov channel. Qhov qhib qhov chaw ntawm qhov chaw nres nkoj yuav tsum tsis txhob ntsib tus neeg teb xov tooj los tiv thaiv kev sib tsoo ntawm cov khoom molten thiab raug mob. Tsis tas li ntawd, qhov haum clearance nruab nrab ntawm lub ejector pas nrig thiab lub ejector qhov, qhov haum clearance ntawm lub ejector thaiv thiab lub stripper thiab cov tub ntxhais kuj yuav siv tau los tso pa tawm.
T structural qhov chaw
Nws hais txog ntau qhov chaw uas tsim cov qauv pwm, suav nrog ntau qhov chaw rau kev taw qhia, demoulding, core-rub thiab parting. Xws li pem hauv ntej thiab nram qab clamping daim hlau, pem hauv ntej thiab nram qab clamping daim hlau, siab bearing daim hlau, siab bearing kab, qhia kab, tso daim hlau, tso rods thiab rov qab rods.
Cov khoom siv cua sov los yog cua txias Qhov no yog ib qho khoom siv los ua kom cov khoom sib txuas hauv cov pwm. Rau cov thermoplastics, nws feem ntau yog cov channel ntawm cov cua txias nruab nrab hauv yin thiab yang pwm. Lub hom phiaj txias yog ua tiav los ntawm kev ncig ntawm qhov nruab nrab cua txias. Qhov nruab nrab cua txias tau qhia txawv ntawm cov yas thiab cov qauv khoom, nrog rau cov dej txias, dej kub, roj kub thiab chav. Qhov tseem ceeb yog kev ua kom txias txias. Cov cua txias tsis sib xws yuav cuam tshuam ncaj qha rau qhov zoo thiab qhov loj ntawm cov khoom. Kev npaj ntawm cov cua txias thiab kev xaiv cov cua txias nruab nrab yuav tsum raug txiav txim siab raws li cov khoom siv thermal ntawm cov khoom molten (xws li crystallization), cov duab ntawm cov khoom thiab cov qauv pwm.