Lub tswvyim ntawm "precision txhaj molding" yog qhov txawv ntawm "paj txhaj tshuaj molding". Nws yog ua raws li kev txhim kho sai ntawm cov ntaub ntawv polymer thiab siv cov khoom siv yas los hloov cov khoom siv high-precision hlau hauv cov cuab yeej thiab cov khoom siv hluav taws xob.
1. Nta ntawm precision txhaj molding:
1.1 Qhov tseeb qhov tseeb ntawm lub workpiece yog siab thiab qhov kam rau ua me me, uas yog, muaj qhov siab-precision qhov ntev;
1. 2 Qhov hnyav ntawm cov khoom muaj qhov ua tau zoo dua qub, xav tau kev ruaj ntseg txhua hnub, txhua hli, thiab txhua xyoo;
1.3 Cov khoom ntawm cov pwm yog qhov zoo, qhov rigidity txaus, qhov tseeb qhov tseeb thiab du ntawm cov kab noj hniav thiab qhov chaw qhov tseeb ntawm cov qauv yog siab;
1.4 Hloov cov tshuab txhaj tshuaj nrog cov tshuab txhaj tshuaj precision;
1.5 Txais precision txhaj tshuaj molding txheej txheem;
1.6 Xaiv cov khoom tsim nyog rau kev txhaj tshuaj molding.
Qhov kev ntsuas tseem ceeb tshaj plaws rau kev soj ntsuam cov khoom lag luam yog qhov tseeb ntawm kev txhaj tshuaj molded cov khoom (qhov ntev ntev, kev kam rau siab thiab cov khoom nto tiav). Txhawm rau txhaj cov khoom yas, nws yog ib qho tsim nyog yuav tsum nruj me ntsis tswj plaub yam xws li xaiv cov khoom, pwm tsim, txheej txheem txhaj tshuaj molding, thiab tus neeg teb xov tooj cov txheej txheem.
Precision txhaj tshuaj molding tshuab xav kom qhov tseeb qhov tseeb ntawm cov khoom feem ntau nyob hauv 0.01-0.001mm, thiab ntau qhov kev txhaj tshuaj molding kuj xav tau cov tshuab txhaj tshuaj molding kom muaj kev txhaj tshuaj siab thiab kev txhaj tshuaj ceev;
Lub clamping system yuav tsum muaj txaus rigidity thiab siab txaus clamping precision. Lub npe hu ua clamping precision yog hais txog qhov sib xws, hloov kho, ruaj khov, thiab siab rov ua haujlwm ntawm lub clamping quab yuam, thiab siab precision ntawm pwm qhib thiab kaw txoj haujlwm;
Nws yuav tsum raug tswj xyuas kom raug lub siab, ntws tus nqi, qhov kub thiab txias, ntsuas, thiab lwm yam kom raug raws li qhov raug, thiab siv ntau theem lossis qib-tsawg txhaj tshuaj kom ntseeg tau tias cov khoom tsim tawm ntawm cov txheej txheem molding thiab rov ua dua ntawm cov khoom loj.
2. Cov yam ntxwv cuam tshuam rau qhov tseeb qhov tseeb ntawm qhov tseeb txhaj tshuaj molded qhov chaw:
2.1 Pwm precision;
2.2 molding shrinkage;
2.3 Qhov kub, av noo, thiab qhov hloov pauv ntawm ib puag ncig uas siv cov khoom siv.
3. Kev xaiv cov qauv ntawm kev txhaj tshuaj molding precision molding cov ntaub ntawv
High mechanical zog, zoo seem stability, zoo creep kuj, thiab dav ib puag ncig adaptability.
Muaj plaub yam khoom siv feem ntau:
POM thiab carbon fiber reinforced (CF) los yog iav reinforced (GF). Cov khoom no yog tus cwj pwm los ntawm kev nkag siab zoo, qaug zog tiv thaiv, huab cua tsis kam, zoo dielectric zog, nplaim taws retardant, thiab yooj yim demolding los ntawm kev ntxiv roj nplua nyeem.
PA thiab iav fiber reinforced PA66, nws cov yam ntxwv: muaj zog cuam tshuam thiab hnav tsis kam, zoo fluidity, thiab tuaj yeem tsim rau hauv cov khoom nrog phab ntsa tuab ntawm 0.4mm. Iav fiber reinforced PA66 muaj qhov kub tsis kam (lub ntsiab lus melting ntawm 250 degree), tab sis nws qhov tsis zoo yog tias nws yog hygroscopic, thiab feem ntau yuav tsum tau ua rau cov av noo tswj tom qab molding.
PBT-reinforced polyester nrog luv molding lub sij hawm. Lub sij hawm molding yog muab piv raws li hauv qab no: PBT Tsawg dua lossis sib npaug rau POM≈PA66 Tsawg dua lossis sib npaug rau PA6.
PC thiab GFPC. Nta: Zoo hnav tsis kam, nce rigidity tom qab qhov cuab lub zog, zoo seem stability, huab cua tsis kam, nplaim retardant, thiab zoo molding processability.
4. Shrinkage teeb meem nyob rau hauv precision txhaj molding
Muaj plaub yam uas cuam tshuam rau shrinkage: tshav kub shrinkage, theem hloov shrinkage, orientation shrinkage, thiab compression shrinkage.
Thaum tshav kub kub shrinkage yog ib qho khoom siv thermophysical ntawm cov khoom siv molding thiab cov ntaub ntawv pwm. Cov pwm kub yog siab, qhov kub ntawm cov khoom kuj yog siab, thiab qhov tseeb shrinkage tus nqi yuav nce, yog li cov pwm kub rau precision txhaj tshuaj yuav tsum tsis txhob siab dhau.
Theem hloov shrinkage yog vim lub shrinkage tshwm sim los ntawm qhov txo qis hauv cov ntim tshwj xeeb thaum lub sij hawm kev taw qhia ntawm crystalline resins, nrog rau crystallization ntawm polymers, uas yog hu ua theem hloov shrinkage. Cov pwm kub yog siab, crystallinity siab, thiab tus nqi shrinkage yog loj; tab sis ntawm qhov tod tes, qhov nce ntawm crystallinity yuav ua rau kom qhov ntom ntawm cov khoom, cov linear expansion coefficient yuav txo, thiab shrinkage tus nqi yuav txo. Yog li ntawd, qhov tseeb shrinkage tus nqi yog txiav txim los ntawm kev sib xyaw ua ke ntawm ob.
Orientation shrinkage, vim yog quab yuam stretching ntawm molecular chains nyob rau hauv cov kev taw qhia ntws, cov macromolecules yuav rov qab thiab rov qab thaum txias, thiab shrinkage yuav tshwm sim nyob rau hauv lub orientation kev taw qhia. Lub degree ntawm molecular orientation yog hais txog kev txhaj tshuaj siab, txhaj tshuaj ceev, resin kub, thiab pwm kub. Tab sis qhov tseem ceeb tshaj plaws yog kev txhaj tshuaj ceev.
Compression shrinkage thiab elastic reset, feem ntau plastics yog compressible. Ntawd yog, qhov tshwj xeeb ntim hloov pauv loj hauv kev kub siab. Ntawm qhov kub thiab txias, qhov tshwj xeeb ntim ntawm cov khoom siv pwm yuav txo qis, qhov ceev yuav nce, qhov nthuav dav coefficient yuav txo qis, thiab tus nqi shrinkage yuav txo qis. Raws li cov compressibility, cov khoom molding muaj cov nyhuv elastic reset, uas txo cov shrinkage ntawm cov khoom. Cov yam ntxwv uas cuam tshuam rau cov khoom molding shrinkage yog muaj feem xyuam rau molding tej yam kev mob thiab kev khiav hauj lwm tej yam kev mob.
5. Precision txhaj pwm
Qhov tseeb ntawm cov pwm feem ntau yog nyob ntawm qhov siab qhov tseeb ntawm cov pwm kab noj hniav, qhov tseeb qhov chaw ntawm cov kab noj hniav los yog seb qhov kev txiav txim siab ntawm qhov seem ua tau raws li qhov yuav tsum tau ua. Feem ntau, qhov ntev ntev ntawm kev txhaj tshuaj pwm yuav tsum tau tswj hauv qab 1/3 ntawm cov khoom qhov ntev ntev.
Machinability thiab rigidity, nyob rau hauv kev tsim cov pwm qauv, cov kab noj hniav yuav tsum tsis txhob ntau dhau, thiab cov phaj hauv qab, cov phaj txhawb, thiab cov phab ntsa kab noj hniav yuav tsum thicker kom tsis txhob muaj elastic deformation ntawm qhov chaw nyob rau hauv qhov kub thiab txias. .
Nyob rau hauv cov khoom molding, cov pwm yuav tsum sim siv ob peb kab noj hniav raws li qhov ua tau, ob peb thiab luv luv khiav, thiab ua tiav ntau dua li cov pwm zoo tib yam, uas yog qhov zoo rau molding.
Cov khoom ntawm precision pwm yog alloy steel nrog siab mechanical zog. Cov khoom siv rau kev ua cov kab noj hniav thiab cov sprue yuav tsum tau ua raws li kev kho cua sov, thiab cov ntaub ntawv uas muaj hardness siab (cov khoom molding yuav tsum ncav cuag HRC52), zoo hnav tsis kam thiab muaj zog corrosion kuj yuav tsum tau xaiv.
6. Cov yam ntxwv thiab kev xaiv ntawm precision txhaj tshuab
Nta nyob rau hauv cov nqe lus ntawm technical parameters:
Hais txog kev txhaj tshuaj siab, lub tshuab zoo tib yam: 147 ~ 177MPa; precision tshuab: 216 ~ 243MPa; Ultra-siab tshuab siab: 243 ~ 392MPa.
7. Yog vim li cas vim li cas lub precision txhaj molding tshuab yuav tsum muaj siab yog:
(1) Txhawm rau txhim kho qhov precision thiab zoo ntawm cov khoom precision, kev txhaj tshuaj siab muaj qhov pom tseeb tshaj plaws ntawm cov khoom shrinkage. Thaum lub siab txhaj tshuaj mus txog 392MPa, molding shrinkage ntawm cov khoom yog yuav luag xoom. Lub sijhawm no, qhov tseeb ntawm cov khoom tsuas yog cuam tshuam los ntawm kev tswj pwm lossis ib puag ncig. Cov kev sim tau ua pov thawj tias: tom qab kev txhaj tshuaj siab tau nce los ntawm 98MPa mus rau 392MPa, cov neeg kho tshuab lub zog nce 3 feem pua rau 33 feem pua.
(2) Nws tuaj yeem txo cov phab ntsa thickness ntawm cov khoom precision thiab ua kom ntev molding. Siv PC ua piv txwv, qhov kev txhaj tshuaj siab ntawm lub tshuab zoo tib yam yog 177MPa, thiab cov khoom siv nrog phab ntsa tuab ntawm 0.2-0.8mm tuaj yeem tsim tau, thaum txhaj tshuaj siab ntawm lub tshuab precision yog 392MPa , thiab cov khoom nrog lub thickness ntawm 0 15-0.6mm tuaj yeem tsim. Ultra-high-pressure txhaj tshuab tuaj yeem tau txais cov khoom lag luam nrog qhov sib piv loj dua.
(3) Ua kom lub zog txhaj tshuaj tuaj yeem paub meej tias cov nyhuv ntawm cov av nkos txhaj tshuaj. Txhawm rau ua kom tiav qhov ntsuas qhov ntsuas, tsuas muaj ob txoj hauv kev: ib qho yog txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau nws tsuas muaj ob txoj hauv kev: lwm qhov yog hloov kho cov ntsia hlau tsis thiab nce qhov nam piv. Qhov kev txhaj tshuaj ntawm lub tshuab txhaj tshuaj precision yuav tsum tau siab.
8. Cov yam ntxwv ntawm lub tshuab txhaj tshuaj precision raws li kev tswj hwm:
8.1 Cov kev cai rau kev rov ua dua (reproducibility) ntawm kev txhaj tshuaj molding tsis yog siab, thiab ntau theem kev txhaj tshuaj tawm tswv yim yuav tsum tau txais yuav:
a. Multi-level txoj hauj lwm tswj;
b. Multi-level ceev tswj;
c. Multi-theem siab tuav tswj;
d. Multi-theem rov qab siab tswj;
e. Multi-theem ntsia hlau ceev tswj.
Qhov tseeb ntawm qhov hloov pauv sensor yuav tsum ncav cuag {{0}}}.1mm, kom lub ntsuas ntsuas stroke, txhaj tshuaj stroke thiab lub thickness ntawm cov khoom seem ntawm lub ncoo (txhaj tshuaj xyuas taw tes) tuaj yeem tswj xyuas kom nruj qhov tseeb ntawm txhua qhov kev txhaj tshuaj thiab txhim kho molding qhov tseeb ntawm cov khoom. Lub chim thiab nozzle kub tswj yuav tsum tau meej, lub overshoot yuav tsum me me thaum kub nce, thiab kub hloov yuav tsum me me. Precision txhaj molding yuav tsum tau txais PID tswj, kom qhov kub thiab txias yog qhov zoo dua li ntawm ± 0.5 degree.
8.2 Plasticization zoo yuav tsum tau. Lub uniformity ntawm plasticization tsis tsuas yog cuam tshuam rau molding zoo ntawm kev txhaj tshuaj molded qhov chaw, tab sis kuj cuam tshuam qhov tsis kam ntawm molten yas thaum nws hla lub rooj vag. Txhawm rau kom tau txais cov yas zoo ib yam, cov ntsia hlau tshwj xeeb thiab siv cov cuab yeej tshwj xeeb plasticizing yog qhov tseem ceeb.
Tsis tas li ntawd, qhov kub ntawm lub thoob yuav tsum tau tswj kom meej meej. Tam sim no qhov kub ntawm cov ntsia hlau thiab lub thoob yog feem ntau tswj los ntawm PID (feem ntau, sib txawv, ib qho), thiab qhov tseeb tuaj yeem tswj tau hauv ± 1 degree, uas tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm kev txhaj tshuaj molding. Yog tias FUZZY tswj tau siv txoj kev, nws yog qhov tsim nyog rau kev txhaj tshuaj molding.
8.3 Qhov ntsuas kub ntawm cov roj ua haujlwm yuav tsum siab. Kev hloov ntawm cov roj kub yuav ua rau qhov hloov pauv ntawm qhov kev txhaj tshuaj siab. Nws yog ib qho tsim nyog yuav tau txais cov cuab yeej kaw rau cua sov thiab txias cov roj ua haujlwm, thiab nws yog ib qho tsim nyog yuav tsum ua kom ruaj khov ntawm cov roj kub ntawm 50-55 degree .
8.4 Kev cuam tshuam ntawm kev tuav lub siab, tuav lub siab muaj kev cuam tshuam zoo rau cov khoom yas precision. Txhawm rau kom meej meej, tuav lub siab tuaj yeem zoo dua pub shrinkage, txo qhov deformation ntawm cov khoom yas, thiab tswj cov khoom yas precision, thiab kev ruaj ntseg ntawm kev tuav lub siab txiav txim siab cov khoom yas. Kev tsim cov khoom raug thiab qhov kawg ntawm qhov kawg ntawm cov ntsia hlau yog qhov kev txiav txim siab uas txiav txim siab lub zog tuav.
8.5 Qhov yuav tsum tau ua rau pwm kub tswj yog tias lub sijhawm txias yog tib yam, cov khoom tuab ntawm cov pwm pwm kab noj hniav kub yuav loj dua cov uas muaj qhov kub thiab txias. Xws li cov ntaub ntawv POM thiab PA, cov khoom siv nrog lub thickness ntawm 50-100 μm ntawm pwm kub ntawm 50 degree, lub thickness yog txo mus rau 20-40 μm ntawm 80 degree, thiab txo mus rau 10 μm ntawm 100 degree. . Chav tsev kub kuj muaj qhov cuam tshuam rau qhov ntev ntev ntawm cov khoom precision.
9. Hydraulic system ntawm precision txhaj molding tshuab:
Cov roj hluav taws xob hluav taws xob yuav tsum muaj qhov sib faib ua ke siv qhov sib npaug ntawm lub siab li qub, proportional flow valves, lossis servo hloov pauv twj.
Nyob rau hauv lub siab ncaj pwm clamping mechanism, cov roj Circuit Court ntawm lub clamping ib feem yog sib cais los ntawm cov roj Circuit Court ntawm txhaj tshuaj.
Vim lub siab ceev ntawm precision txhaj molding tshuab, cov lus teb ceev ntawm hydraulic system yuav tsum tau hais txog.
Lub hydraulic system ntawm precision txhaj molding tshuab yuav tsum muaj kev cuam tshuam tag nrho cov engineering ntawm electromechanical hydraulic twj.
Cov yam ntxwv ntawm precision txhaj molding tshuab:
Vim lub siab txhaj tshuaj ntawm lub tshuab txhaj tshuaj precision, nws yog ib qho tsim nyog yuav tsum tau hais txog qhov rigidity ntawm pwm clamping system. Qhov sib npaug ntawm kev txav thiab cov qauv ruaj khov yog tswj tau nyob rau hauv thaj tsam ntawm 0.05-0.08mm.
Nws yuav tsum tau tiv thaiv cov pwm uas tsis tshua muaj siab thiab tswj qhov precision ntawm lub clamping quab yuam. Vim tias qhov loj ntawm pwm clamping quab yuam cuam tshuam rau qib ntawm pwm deformation, thiab thaum kawg cuam tshuam rau qhov ntev ntev ntawm lub workpiece.
Qhov ceev ntawm qhib thiab kaw cov pwm yuav tsum ceev, feem ntau nyob ib ncig ntawm 60mm / s.
Plasticizing Cheebtsam: ntsia hlau, ntsia hlau taub hau, tsis rov qab lub nplhaib, chim, thiab lwm yam, yuav tsum tau tsim kom muaj ib tug qauv nrog muaj zog plasticizing muaj peev xwm, zoo homogenization degree, thiab siab txhaj efficiency; qhov tsav torque ntawm cov ntsia hlau yuav tsum loj, thiab nws tuaj yeem hloov mus tas li.
Tsis muaj teeb meem dab tsi ntawm precision txhaj tshuaj molding tshuab, nws yuav tsum muaj peev xwm tswj tau qhov rov ua dua ntawm cov khoom loj thiab qhov zoo kawg nkaus. Nws kuj yog qhov tseem ceeb tshaj plaws rau txhua lub tuam txhab txhaj tshuaj molding. Peb lub tuam txhab muaj ntau xyoo ntawm kev paub hauvprecision txhaj molding. Zoo siab txais tos rau kev sib tham.