Lub hauv paus ntsiab lus yog dab tsi, yam ntxwv, daim ntawv thov thiab txheej txheem ntawm kev txhaj tshuaj molding los ntawm kev txhaj tshuaj molding tshuab?

Hnub no cia peb tham txog lub hauv paus ntsiab lus, yam ntxwv, daim ntawv thov thiab txheej txheem ntawm kev txhaj tshuaj molding los ntawm txhaj tshuaj molding tshuab.

1. Lub hauv paus ntsiab lus ntawm txhaj tshuaj molding. Ntxiv granular los yog hmoov yas rau hauv lub hopper ntawm lub tshuab txhaj tshuaj. Cov yas yog rhuab thiab yaj hauv lub tshuab txhaj tshuaj kom nws ntws, thiab tom qab ntawd txhaj rau hauv lub pwm kaw hauv qab lub siab. Tom qab txias thiab shaping, nws melts Cov yas yog solidified los ua cov yas yuav tsum tau. Rau

2. Yam ntxwv ntawm kev txhaj tshuaj molding
Txhaj tshuaj molding muaj lub voj voog luv luv thiab tsim tau zoo. Kev txhaj tshuaj molding tuaj yeem tsim cov khoom yas nrog cov duab nyuaj, siab loj xav tau thiab ntau yam inserts, uas yog qhov nyuaj rau ua tiav los ntawm lwm txoj kev yas molding; thib ob, txhaj tshuaj molding yog nyob rau hauv cov txheej txheem ntau lawm Nws yog ib qho yooj yim kom paub automation, xws li txhaj tshuaj, demolding, tshem tawm rooj vag thiab lwm yam kev ua haujlwm tuaj yeem ua haujlwm, yog li kev txhaj tshuaj molding tau siv dav.

2.1 Qhov zoo:
Lub voj voog molding yog luv, ntau lawm efficiency yog siab, thiab nws yog ib qho yooj yim kom paub automation. Nws tuaj yeem tsim cov duab sib txawv, qhov tseeb qhov ntev, yas qhov chaw nrog hlau los yog tsis yog hlau inserts, ruaj khov khoom zoo, thiab dav siv ntau yam.

2.2 Qhov tsis zoo:
Tus nqi ntawm cov khoom siv txhaj tshuaj molding yog qhov siab; Cov qauv ntawm kev txhaj tshuaj pwm yog complex; tus nqi ntau lawm yog siab, lub voj voog ntau lawm yog ntev, thiab nws tsis tsim nyog rau kev tsim cov khoom ib leeg thiab cov khoom me me.
3. Daim ntawv thov Tsuas yog ob peb lub thermoplastics (fluoroplastics), yuav luag tag nrho cov thermoplastics tuaj yeem siv los tsim cov khoom yas los ntawm kev txhaj tshuaj molding. Txhaj tshuaj molding tsis yog tsuas yog siv rau molding ntawm thermoplastics, tab sis kuj tau ntse siv rau molding ntawm thermoset plastics. Tam sim no, nws cov khoom molded account rau 20-30% ntawm tag nrho cov khoom yas tam sim no. Txhawm rau txuas ntxiv nthuav dav ntawm kev txhaj tshuaj molded yas qhov chaw, qee qhov kev txhaj tshuaj tshwj xeeb tau tsim tshwj xeeb rau molding cov khoom yas nrog cov khoom tshwj xeeb lossis cov qauv tsim tshwj xeeb. Xws li precision txhaj tshuaj ntawm high-precision yas qhov chaw, ntau xim txhaj tshuaj ntawm cov khoom sib xyaw xim yas, sandwich txhaj ntawm sandwich yas qhov chaw muaj li ntawm cov khoom sib txawv sab hauv thiab sab nraud, thiab txhaj compression molding ntawm optically pob tshab yas qhov chaw. Rau

4. Txhaj tshuaj molding txheej txheem

4.1 Kev npaj ua ntej molding

Raw khoom zoo li tshuaj xyuas thiab kev ntsuas kev ua tau zoo: suav nrog kev tshuaj xyuas cov xim yas, particle loj thiab uniformity, fluidity (yaj index, viscosity), thermal stability thiab shrinkage tus nqi. Rau

Yas preheating thiab ziab: tshem tawm cov dej noo ntau dhau thiab volatiles nyob rau hauv cov khoom los tiv thaiv qhov tsis xws luag lossis degradation ntawm qhov chaw ntawm cov yas tom qab molding, uas yuav cuam tshuam cov tsos thiab sab hauv zoo ntawm cov yas. Txoj kev ziab cov khoom: me me batch ntau lawm, siv qhov cub kom qhuav; ntau lawm, siv lub tshuab ziab khaub ncaws los yog lub tshuab nqus tsev vacuum.
Kev tu lub thoob: Lub thoob yuav tsum tau ntxuav thaum hloov cov khoom, hloov cov ntaub ntawv thiab xim. Rau

Ntxig preheating: txo qhov kub ntawm qhov sib txawv ntawm cov khoom siv thiab qhov ntxig, txo qhov shrinkage kev nyuaj siab ntawm cov yas nyob ib ncig ntawm lub insert, thiab xyuas kom zoo ntawm cov yas. Rau

Kev xaiv tus neeg tso tawm: Feem ntau siv cov tshuaj tso tawm muaj xws li zinc stearate, kua paraffin thiab silicone roj. Rau

4.2 Kev txhaj tshuaj

Pub: Ntxiv granular los yog hmoov yas rau hauv lub hopper ntawm lub tshuab txhaj tshuaj. Rau

Plasticization: Through the heating of the heating device of the injection machine, the plastic raw material in the screw is melted and becomes a plastic melt with good plasticity. Rau

Mold filling: The plasticized plastic melt is pushed by the plunger or screw of the injection machine to enter and fill the mold cavity through the nozzle and the pouring system of the mold at a certain pressure and speed. Rau

Pressure maintaining and feeding: after the melt fills the cavity, under the plunger or screw of the injection machine, the melt still maintains the pressure for feeding, so that the melt in the barrel continues to enter the cavity to supplement the plastic in the cavity Shrinkage is required and can prevent the melt from flowing back.
To Cooling after the gate is frozen: After a period of time, cov yas molten nyob rau hauv cov kab noj hniav yog solidified rau hauv cov khoom kom ntseeg tau tias cov yas ib feem muaj rigidity txaus thaum nws yog demolded thiab tsis ua warpage los yog deformation.. Rau

Demoulding: Cov khoom yas yog txias rau qhov kub thiab txias, thiab lub ejection mechanism thawb cov yas tawm ntawm pwm. Rau

4.3 Tom qab ua cov khoom yas

Cov laj thawj thiab qhov cuam tshuam ntawm kev ua haujlwm tom qab:
Vim tsis sib xws plasticization los yog tsis sib xws crystallization, orientation thiab txias ntawm cov yas hauv kab noj hniav; los yog vim muaj kev cuam tshuam ntawm cov hlau ntxig lossis kev ua haujlwm tsis zoo ntawm cov khoom yas, qee qhov kev ntxhov siab sab hauv inevitably muaj nyob rau hauv cov khoom yas , Ua rau deformation lossis tawg ntawm cov khoom yas thaum siv, yog li peb yuav tsum sim tshem tawm lawv. Rau

Annealing kev kho mob: txheej txheem kev kho cua sov uas cov khoom yas tau muab tso rau hauv qhov ntsuas kub tsis tu ncua ua kua nruab nrab (xws li dej kub, roj kub, kua paraffin, lwm yam.) los yog cua kub ncig qhov cub rau lub sijhawm, thiab mam li maj mam txias rau chav tsev kub.
a) Kub: 10° ~ 15 ° siab tshaj qhov kev khiav hauj lwm kub los yog 10 ° ~ 20 ° qis dua qhov kub distortion kub.
b) Sijhawm: Feem ntau, nws tuaj yeem suav tau li ntawm ib nrab ib teev ib millimeter ntsig txog hom yas thiab lub thickness ntawm cov yas. Rau
c) Muaj nuj nqi: Tshem tawm cov kev ntxhov siab sab hauv ntawm cov yas, stabilize qhov loj ntawm cov yas, nce lub crystallinity, stabilize cov qauv crystalline, Li no txhim kho nws cov elastic modulus thiab hardness.Humidity txias kho: ib txoj kev kho mob tom qab uas muab cov yas tshiab demolded rau hauv qhov nruab nrab cua sov (xws li boiling dej, potassium acetate daws) txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau nqus noo noo. (Feem ntau yog siv rau cov yas uas muaj hygroscopic heev thiab yooj yim oxidized, zoo li PA)

a) Kub: 100~ 121 ℃ (lub sab sauv txwv yog noj thaum lub tshav kub distortion kub siab, thiab qhov kev txwv qis dua yog coj rov qab).
b) Sijhawm: Lub sijhawm tuav yog cuam tshuam nrog lub thickness ntawm cov yas, feem ntau 2 ~ 9h. Rau
c) Lub Hom Phiaj: Tshem tawm cov kev ntxhov siab seem; ua kom cov khoom ncav cuag noo noo qhov sib npaug kom sai li sai tau los tiv thaiv qhov hloov pauv thaum siv. Rau

5. Txheej txheem parameter ntawm txhaj tshuaj molding

5.1 Kub

a) Barrel kub

Qhov kub ntawm lub thoob yuav tsum nyob nruab nrab ntawm qhov kub ntawm qhov dej khov (los yog melting point) thiab thermal decomposition kub. Qhov kub ntawm lub plunger chim yog 10-20 ° C siab tshaj qhov kub ntawm lub taub hau. Rau

Cov yam ntxwv ntawm yas: Thaum tshav kub kub-sensitive yas xws li polyoxymethylene, polyvinyl fluoride, lwm yam. yuav tsum nruj me ntsis tswj qhov siab tshaj plaws kub ntawm lub thoob thiab lub sij hawm nyob rau hauv lub thoob; cov thermoplastic yas nrog iav fiber ntau yuav tsum nce lub chim kub vim tsis zoo fluidity. Txhawm rau tiv thaiv cov yaj los ntawm kev ua kom tawv thaum ntxov hauv lub thoob, qhov kub ntawm lub thoob yuav coj tus nqi me me.
Yas qhov chaw thiab pwm qauv: Rau nyias-walled qhov chaw, lub chim kub yog siab tshaj qhov tuab-walled qhov chaw; rau qhov chaw nrog cov duab complex lossis nrog cov ntxig, lub thoob kub yuav tsum siab dua. Rau

Qhov ntsuas kub ntawm lub thoob feem ntau ua raws li lub hauv paus ntsiab lus ntawm siab pem hauv ntej thiab qis rov qab, yog, qhov kub thiab txias ntawm sab nraub qaum ntawm lub thoob (noj chaw nres nkoj) yog qhov qis tshaj plaws thiab qhov kub ntawm nozzle yog siab tshaj.

Rau cov ntsia hlau txhaj tshuab, txhawm rau tiv thaiv thermal degradation ntawm cov yas vim yog cov shear sib txhuam tshav kub ntawm cov ntsia hlau thiab cov yaj, yaj thiab yaj, thiab yaj thiab lub thoob, qhov kub ntawm sab pem hauv ntej ntawm lub thoob tuaj yeem qis dua me ntsis ntawm qhov nruab nrab. Txhawm rau txiav txim seb qhov kub ntawm lub thoob puas tsim nyog, txoj kev txhaj tshuaj cua tuaj yeem siv los soj ntsuam lossis ncaj qha saib xyuas qhov zoo ntawm cov khoom yas.

Thaum tshav kub kub txhaj tshuaj, yog hais tias cov khoom ntws yog uniform, du, npuas-dawb, thiab uniform nyob rau hauv cov xim, cov khoom kub yog qhov tsim nyog; yog hais tias cov khoom ntws yog ntxhib, nyiaj hlau los yog discoloration, nws txhais tau hais tias cov khoom kub tsis tsim nyog. Rau

b) Nozzle kub

Feem ntau, nws yog me ntsis qis dua qhov kub siab tshaj plaws ntawm lub thoob los tiv thaiv cov khoom molten los ntawm drooling ntawm lub nozzle. Tab sis nws yuav tsum tsis txhob qis dhau, txwv tsis pub cov yaj yuav muaj qhov ua kom ntxov ntxov ntawm lub nozzle thiab thaiv lub nozzle, los yog ntxov ntxov solidification yuav raug txhaj rau hauv pwm kab noj hniav thiab cuam tshuam rau qhov zoo ntawm cov khoom yas. Rau

c) Pwm kub

Cov pwm kub yog txiav txim los ntawm cov yam ntxwv ntawm cov yas, qhov loj thiab cov qauv ntawm cov khoom yas, kev ua tau zoo thiab lwm yam txheej txheem txheej txheem. Pwm kub ↑, fluidity ↑, ceev thiab crystallinity ↑, shrinkage tus nqi thiab productivity ↓.
Cov pwm kub feem ntau yog tswj los ntawm qhov kub thiab txias qhov nruab nrab; kuj tseem muaj txoj hauv kev los tswj qhov kub thiab txias los ntawm kev txhaj cov khoom molten rau hauv pwm kom ua tiav qhov sib npaug ntawm cov cua sov thiab cov cua sov.; nyob rau hauv cov xwm txheej tshwj xeeb, cov kab hluav taws xob tiv thaiv thiab cov hluav taws kub tiv thaiv kuj tseem siv tau los tswj qhov kub thiab txias. Cov pwm yog rhuab kom cov pwm ntawm qhov kub thiab txias. Tab sis tsis muaj teeb meem dab tsi, rau cov yas yaj, nws yog txheej txheem txias. Rau

5.2 Siab

(1) Plasticizing siab (rov qab siab): hais txog lub siab ntawm cov yaj nyob rau sab saum toj ntawm cov ntsia hlau thaum cov ntsia hlau rov qab thaum siv lub tshuab txhaj tshuaj. Rau

Lub plasticizing siab nce, qhov kub ntawm cov yaj thiab nws cov uniformity zoo tuaj, cov ntaub ntawv xim yog tov uniformly, thiab cov roj hauv cov yaj yog tawm mus. Tab sis tus nqi plasticization yog txo, thiab lub voj voog molding yog ntev. Rau

Hauv kev ua haujlwm dav dav, nyob rau hauv lub hauv paus ntawm kev ua kom zoo ntawm cov khoom yas, lub plasticizing siab yuav tsum tsawg li tsawg tau, Feem ntau hais txog 6MPa, thiab feem ntau tsis tshua muaj ntau tshaj 20MPa
Rau
(2) Txhaj tshuaj: yog hais txog lub siab tawm ntawm lub plunger lossis sab saum toj ntawm cov ntsia hlau ntawm cov yas yaj. Rau

Muaj nuj nqi: kov yeej qhov kev khiav hauj lwm ntawm cov yaj ntws thaum lub sij hawm sau cov txheej txheem thaum txhaj tshuaj, yog li ntawd lub yaj muaj ib tug tej yam filling npaum li cas; thaum tuav lub siab, lub yaj yog compacted thiab tiv thaiv los ntawm ntws rov qab. Rau

Loj: Nws nyob ntawm hom kev txhaj tshuaj tshuab, hom yas, pwm qauv, pwm kub, phab ntsa thickness ntawm cov yas ib feem, thiab cov qauv thiab qhov luaj li cas ntawm lub pouring system. Raws li ib txwm muaj: txhaj tshuaj ntawm high-viscosity yas> low-viscosity yas; siab txhaj tshuaj rau nyias-walled, cheeb tsam loj, thiab complex-zoo li tus yas qhov chaw; yooj yim pwm qauv, loj rooj vag loj, thiab qis txhaj tshuaj; plunger txhaj tshuab Txhaj siab> ntsia hlau txhaj tshuab; lub chim kub thiab pwm kub yog siab, thiab kev txhaj tshuaj siab tsawg. Rau

5.3 Sijhawm

Lub sijhawm yuav tsum tau ua kom tiav cov txheej txheem txhaj tshuaj molding yog hu ua lub voj voog txhaj tshuaj molding.

6. Kev tsim cov txheej txheem molding txheej txheem Raws li kev siv cov khoom siv yas thiab cov txheej txheem ntawm cov yas, txoj kev molding raug raug xaiv, cov txheej txheem molding thiab txheej txheem molding yog txiav txim siab, thiab kev xaiv cov yas pwm thiab cov cuab yeej molding yog tsim los ua kom cov txheej txheem molding du Ua cov haujlwm no rau cov khoom yas kom tau raws li qhov yuav tsum tau yog feem ntau hu ua kev tsim cov txheej txheem tshwj xeeb rau cov khoom yas..
Nws yog cov ntaub ntawv qhia kev hauv cov yas molding ntau lawm thiab lub hauv paus tseem ceeb rau kev tsim khoom. Nws khiav los ntawm txhua theem ntawm cov txheej txheem tsim khoom thiab yuav tsum tau ua nruj me ntsis.6.1 Kev tshuaj xyuas cov khoom yas

Cov duab thiab cov qauv ntawm cov khoom yas txiav txim siab cov qauv ntawm cov pwm, thiab nws muaj kev cuam tshuam zoo rau seb cov khoom yas puas tuaj yeem tsim tau zoo thiab zoo tom qab tsim.

Txhawm rau kom ntseeg tau qhov zoo ntawm cov khoom yas, feem ntau cov ntsiab lus hauv qab no yuav tsum tau them sai sai rau:

6.1.1 Kev soj ntsuam ntawm cov yas

(1) Kev soj ntsuam ntawm kev ua haujlwm ntawm cov yas
(2) Kev soj ntsuam ntawm cov txheej txheem yas ua haujlwm

6.1.2 Kev tsom xam ntawm cov qauv, qhov ntev, kam rau ua, thiab cov qauv txheej txheem ntawm cov khoom yas

(1) Cov qauv ntawm cov yas puas ua tau raws li qhov yuav tsum tau ua ntawm molding processability?
(2) Qhov ntev, tolerances thiab technical Standards ntawm yas qhov chaw

6.2 Kev txiav txim siab ntawm txoj kev molding thiab txheej txheem ntws ntawm cov khoom yas

Raws li cov yam ntxwv ntawm cov yas, cov kev cai ntawm cov khoom yas, thiab tus qauv, qhov loj, ntau lawm batch, siv tej yam kev mob thiab molding khoom ntawm cov yas qhov chaw, ib tug series ntawm cov kev pab cuam molding yog npaj. Los ntawm kev sib piv ntawm txhua txoj kev npaj, txoj kev molding zoo tshaj plaws ntawm cov khoom yas yog txiav txim siab raws li qhov tseeb ntau lawm ntawm qhov chaw. Tom qab txoj kev molding ntawm cov khoom yas yog txiav txim siab, cov txheej txheem ntws yuav tsum tau txiav txim siab.
6.3 Kev txiav txim siab ntawm cov txheej txheem molding

Cov txheej txheem tsim nyog yuav tsum raug xaiv rau cov khoom siv yas uas tsim nyog los ntawm ntau txoj kev molding. Muaj ntau yam uas cuam tshuam rau cov txheej txheem yas molding, thiab muaj ntau yam txheej txheem uas yuav tsum tau tswj, thiab kev sib raug zoo ntawm cov txheej txheem txheej txheem yog ze heev. Yog li ntawd, Kev tsom xam yuav tsum tau ua raws li cov yam ntxwv thiab cov xwm txheej tiag tiag ntawm cov yas, thiab cov txheej txheem tsim nyog yuav tsum tau xaiv thawj zaug, thiab tom qab ntawd kuaj Thaum lub sij hawm molding txheej txheem, cov txheej txheem cov txheej txheem yog maj mam hloov kho raws li qhov tseeb qhov teeb meem ntawm molding ntawm cov yas qhov chaw thiab cov tshuaj ntsuam xyuas ntawm cov yas qhov chaw. Rau

6.4 Kev xaiv cov khoom siv thiab cov cuab yeej

Thaum txoj kev molding raug txiav txim, cov khoom siv molding tsim nyog yuav tsum tau xaiv, thiab cov txheej txheem cuam tshuam thiab kev teeb tsa ntawm cov khoom siv thiab pwm yuav tsum raug kuaj xyuas. Cov txheej txheem molding sib txawv siv cov cuab yeej molding sib txawv. Ntxiv nrog rau cov khoom siv molding, lwm cov txheej txheem kuj yuav tsum xaiv cov khoom siv sib xws, thiab qhia cov specifications thiab technical parameters ntawm cov cuab yeej siv raws li tus txheej txheem. Rau

6.5 Kev tsim cov ntaub ntawv txheej txheem

Kev npaj cov ntaub ntawv txheej txheem yog los sau cov ntsiab lus thiab qhov tsis zoo ntawm cov txheej txheem txheej txheem saum toj no thiab txiav txim siab lawv nyob rau hauv daim ntawv ntawm cov ntaub ntawv tsim nyog raws li lub hauv paus rau kev npaj ntau lawm thiab cov txheej txheem tsim khoom.. Cov txheej txheem daim npav yas yog cov ntaub ntawv tseem ceeb tshaj plaws hauv kev tsim khoom.