Tsvagiridzo nezve Mhedzisiro yeScrew Rotation Yekumhanyisa Yejekiseni Molding Machine paPlasticizing Kugona uye Inooneka Viscosity.

0 Nhanganyaya

Jekiseni molding muchina ndiyo huru midziyo yekuumba epurasitiki, kunyanya nejekiseni system.System, clamping system, magetsi ekudzora hurongwa, lubrication system, hydrostatic transmission system,Kupisa uye kutonhora system, kuchengetedzwa kwekutarisa system, nezvimwewo. Kuvandudza chigadzirwa chemhandoQuantity, kugadzirwa zvakanaka, kuderedza kushandiswa kwesimba, vanhu vakaita tsvakiridzo yakadzama pazviri.Tsvakiridzo pamichina yekuumba jekiseni ine zvakawanda, kusanganisira magetsi ekudzora system.Intelligent transformation.Servo shanduko yetransmission system Simba rekuchengetedza kupisa uye kutonhora systemReform.The screw structure shanduko yeplasticizing kugona. Iyo screw ndiyo musimboti wemajekiseni ekuumba muchinaHeart zvikamu, ane maparamendi anotarisa huwandu hwejekiseni yemuchina wejekiseni, vatsvakurudzi vakadzidza Zvimwe. Iyo iri nani iyo plasticizing kufanana kwesiruu inomiririra kudzokororwa kwechokwadi kwechigadzirwa.Iyo yakakwirira kuyerwa kwechiyero, iyo parameter yekuita yeplasticizing uniformity inooneka viscosity.Imo iyo shanduko ye screw structure inobatsira kudzikisa inooneka viscosity yekunyungudika., sikuruu.

Iyo simba inotarwa neiyo screw chimiro uye screw speed, pressure, speed, tembiricha, etc.Ndiyo huru parameter kuyera kushanda kwe screw. Wang XishMelting yejekiseni screwBody transport yakaongororwa nedzidziso. Li Zhenge Mhedzisiro yekushisa uye kumashure kumanikidza pane hozhwaKufurira kwetsvimbo plasticizing kugona. Plasticizing simba inomiririra kugona kwekugadzira jekiseni rekugadzira muchina,Izvo zvinodikanwa kuvandudza kugona kweplasticizing ye screw kune mabhenefiti ehupfumi emabhizinesi.

Kugona kweplasticizing yetsvimbo kunoreva kunaka kwezvinhu zvepurasitiki pane imwe nguva yejekiseni yekuumba muchina screw. Hunhu hwekuchengetera zvinhu hunotarwa nekamuri yekuyera., uye kubuda kwescrew homogenization chikamuYakabatana nekamuri yekuyeresa, iyo vhoriyamu pakubuda kwescrew homogenizing chikamu inogona kuyerwa.Kugona kweplasticizing kwescrew kwakatemwa nehuwandu hwekupasa.Mukusarudzwa kwezvinhu zvekushandisa., iyo viscosity inokanganiswa zvakanyanya neshear rate uye tembirichaChiyero chekunzwa kwakaderera kwepolypropylene kufambisa kuonekwa uye kucherechedzwa kwemhedzisiro yekuedza.. Iri bepaMunda wekuyerera wePP unonyunguduka muchikamu chehomogenizing che screw inoongororwa neFluent software..

Kushandisa nzira yekutsvagisa yekubatanidza kuyedza uye ongororo yetioretical, screw rotation

Mhedzisiro yekudzika kwakasiyana sikururu pane tembiricha, kuoneka viscosity, velocity uye plasticizing kugonaThe volumetric pass rate pakubuda kwescrew homogenizing chikamu inoongororwa kuti ikwidzise theScrew kumhanya kwejekiseni rekugadzira muchina wekugadzira paramita..

1 Theoretical analysisMupepa rino, iyo homogenization yeLYH680 yepurasitiki jekiseni rekugadzira muchina inoteedzerwa neFluent.Section yepombi fluid., kuseta akasiyana screw speed, kuongororwa kwechikamu chehomogenization chepombiChiyero chekufamba kwevhoriyamu pakubuda kwechikamu chepropylene fluid homogenization chinowanikwa. Iyo inooneka viscosity yePP inonyunguduka uye kugona kweplasticizing ye screw yakaongororwa.. Chikamu chemushini wekuumba jekiseni Iwo akakodzera paramita ndeaya: kureba kwechikamu chehomogenized che screw ndeye 80 mm, uye tembiricha yebhari muchikamu chehomogenizing inoiswa Set pa 220 C, kunyunguduka kumanikidzwa muchikamu chehomogenizing ndiko 1.5 MPa, uye kudzika kwescrew groove i2.2Mm, screw screw angle ndiyo 17.66 °, sikuruu urefu-dhayamita reshiyo iri 19.6, screw diameter32 mm; Iyo yakanyunguduka density ye polypropylene (PP) aiva 770 kg / m3 Nzvimbo yekunyungudika ndeye 170 °C, iyo thermal conductivity coefficient yekunyungudika ndeye 0.182W / (m · °C), uye the melt ratioHeat kugona kwe 2900 J / (kg · C), nyungudutsa viscosity ye 421 Pa · s (453 K / 320)Pa·s (463 K)/250 Pa·S (473 K)。 Mukuita engineering, funga nezvemvuraKuwanda kunochinja zvishoma nekuda kwekuti polima yakanyungudutswa inogerwa mumushini wekupeta jekiseni kana yagadzirwa kare.Kuveura chiyero kushoma pane 10-3 m / s, panguva iyo kunyunguduka kunowanikwa munzvimbo isiri yeNewtonian rheological yekutanga Munharaunda iyi, iyo yakanyunguduka polymer inogona kutorwa seNewtonian fluid, saka iyo PP inonyunguduka inoonekwa senge isingagoneki laminar Newtons fluid mune theoretical uye yekuyedza bvunzo yekuongorora..

• Kugadzwa kweiyo coordinate system

Iyo yekutanga inotenderera nzira iyo iyo chinhu chinopfuura yakatambanudzwa kuita cuboid chiteshi,Iwo matatu-dimensional space modhi yakagadzirwa kubva kwaakabva inoratidzwa muFigure 1 kuFigure 3.

1.2 Kugadzwa kweFluid Governing Equation (f) + div (p f) = div (γ gradphi) + S. (1) Ipo φ ishanduko yemuviri yakajairika; Iyo generalized diffusion coefficient inoenderana ne phi; S ishoko rinowanikwa mune zvese.

Maererano neGuangyi nzira, iyo equation yekuchengetedza huwandu uye kukurumidza inotangwa pamusuwo wehomogenization chikamu che x-y ndege. (z = 0).

dV

r

Z = – zve pb + π F + δ V.

(2) Mune dt formula: rho ndiyo density yakanyungudika, kg / m3; Vz ndiko kuyerera kwechinhambwe mu z direction, m / s, kupinda mu spiral groove munharaunda ye homogenization; F ndiko kukurumidza kwegiravhiti, m / s2; Pb is back pressure, Pa; Iko kunyunguduka viscosity,

Pa·s; T kwenguva, s; ▽ ndiye mushandisi weHamiltonian，▽= ∂ i+ ∂ j+ ∂ k。 ∂x ∂y ∂z

Equation (2) ndiyo momentum equilibrium equation (N-S equation) ye viscous fluid, mvura iri muspiral groove inonzi isothermal flow; Iyo viscosity uye density minda yakafanana. Upamhi hwe spiral groove hwakakura zvakanyanya kupfuura kudzika kwe spiral groove, uye mhedzisiro ye screw side wall haina kufuratirwa. Iyo inonyunguduka inoyerera zvizere ichitevedza screw channel, kusazvidza kuyerera kweiyo inopinza uye yekubuda, asi tichifunga nezve mhedzisiro ye reverse back pressure. N-S equation inorerutswa nemamiriro ari pamusoro:

2

dp

dy=1·b。 (3) dy2ta dx

Batanidza y kaviri uye upe mamiriro emiganhu (y = 0, Vz = 0; Y = h, Vz = π NDcos theta / 60). Iyo inoyerera velocity kugovera mamiriro ehurumende basa munzira yekunyungudika inowanikwa, ndizvo

NDyπ cos theta hy-y2pb

Vz = 120h – 2uye × Lsintheta. (4)

Iko h ndiko kudzika kwescrew groove muchikamu chehomogenization, m; Iyo helix angle ye screw, (°); L ndihwo hurefu hwechikamu chehomogenized, m; N is screw speed, r a d / m ini n; D ndiyo dhayamita yakatwasuka yescrew rod, m.

1.3 Kuverengera kwe theoretical plasticizing kugona

Kutsiva Eq. (4) mune inoyerera tsananguro equation, Q = WhVz = π DhVzsynthesizer, anopa

22 32

Mpt = Qπ = π D Nhрsin θ cos θ – p Dhsin

Pitch. (5) 120 12 L uko: W ndiyo hupamhi hwechikamu chemvura, m; MPT ndiyo Theoretical Plastic yeScrew Type Plastic Injection Molding Machine

Kukwanisa kwemakemikari, kg / s; Q ndiyo vhoriyamu yekupasa mwero we melt homogenization chikamu, m3 / s. Kuburikidza ne equation (5), zvinogona kuonekwa kuti plasticizing kukwanisa kwe screw inobatwa nemhando dzakasiyana-siyana dzemaitiro akadai se screw diameter, screw groove angle, nyungudutsa pressure uye screw groove kudzika. Iyo yakakwira screw speed, iyo yakasimba iyo plasticizing kugona; Apo iyo inooneka viscosity yekunyunguduka inowedzera, iyo plasticizing kugona kwe screw inowedzera.

Migumisiro yekuedza uye kuenzanisa kuongorora

2.1 Simulation kuongorora nemigumisiro

1) Mamiriro ekufananidza kuongorora.

Chiso chinopinda chinoguma: kubva pavelocity distribution state function mu z direction yekunyungudika (zvakaita se (4)), kumhanya kwepanopinza chikamu chehomogenizing chinoshanduka ne y kukosha. Iye zvino N = 120, 140, 160, 180 rad / min inotsiviwa muVz zvakateerana, uye iyo yekutanga yakateedzerwa velocity padivi pe spiral direction pamusuwo wehomogenization chikamu chinotemerwa kuburikidza nebasa dudziro yeFluent nemutauro wayo wekuronga UDF., ndizvo, iyo yekutanga velocity pasi pekufananidza uye kuyerwa mamiriro; Nekuti kunyungudika kunyungudika painopinza kwakadzikira zvakanyanya pane screw head pressure, kudzvinyirirwa pakupinza kwechikamu chehomogenization ndiko 0; Zvinoenderana nemaitiro ma paramita ePP zvinhu uye zvishandiso, iyo

Iyo yekunyunguduka tembiricha yakaiswa 465 K. Kuruboshwe uye kurudyi madziro emadziro: y-z ndege (x = 0), (x zvakaenzana 3.2 × 10-2 m) se homogenization zvikamu

Mativi maviri escrew groove wall akaiswa semadziro asina kutsvedza, uye tembiricha yekunyunguduka ndiyo tembiricha yekuwa, iyo yakagadzirirwa 473 K maererano nePP zvinhu maitiro uye mamiriro chaiwo emidziyo.

Kumusoro uye kuzasi sidewalls: x-z ndege (y = 0), (y = 2.2 × 10-3 m) sepazasi nepamusoro mativi escrew groove yechikamu chehomogenization, rutivi rwezasi rwunoonekwa semadziro asina kutsvedza, tembiricha yekunyunguduka ndiyo tembiricha yekuwa, uye tembiricha yakaiswa 473 K maererano nemhando yezvinhu zvePP uye mamiriro chaiwo emidziyo; Rutivi rwepamusoro rwescrew groove muchikamu chehomogenization inzvimbo yekubatana yekunyunguduka uye mbiya., iyo melt flow rate ndiyo yakanyanya, uye tembiricha yekunyunguduka yakaenzana neiyo tembiricha yekupisa mbiya, iyo yakagadzirirwa 493 K maererano nekugadzirwa kwemamiriro ezvinhu ePP zvinhu.

Chiso chinobuda kunze: iyo x-y ndege (z = 0.264 m) sekubuda kwechikamu chehomogenization, muganhu wekumanikidza unogamuchirwa, uko kudzvinyirirwa kunopesana nekwakananga z, uye kudzvinyirirwa kunoiswa kuti kuenzane nemichina yekuedza yekuongorora nyore uye kuenzanisa, uye kumanikidzwa kwemashure kunoiswa -1.2 MPa.

• Simulation analysis results

Zve x = 0.01, iyo curve diagram yevelocity, tembiricha uye viscosity pakubuda kwechikamu chehomogenization sebasa rekudzika kwespiral groove inoratidzwa muFigures. 4 ku 6.

Tinogona kuona kubva Figure 4 kuti pamwe nekuwedzera screw speed, kumhanya kwechikamu chehomogenization pakubuda kunowedzerawo, nekuwedzera kwekudzika kwescrew groove, speed inotanga yadzikira yobva yawedzera, izvo zvinokonzeresa simba rekugera uye viscosity pamusoro nepamusoro pepasi peiyo screw groove., zvinoenderana nepolymer fluid mundiro.

Kuchinja pakati. Sezvatinogona kuona kubva Figure 4, nekuwedzera kwe screw speed, Iyo velocity pakubuda kwehomogenizing chikamu inowedzerawo. Nekuwedzera kwekudzika kwegorofu, iyo velocity inoderera kutanga uye inowedzera. Izvi zvinokonzerwa nesimba guru rekugera uye viscosity pamusoro nepamusoro pepamusoro penzvimbo ye groove., iyo inoenderana nekushandurwa kwepolymer fluid pakati pemahwendefa. Shanduko yetembiricha munzira yeradial sezvakaratidzwa muFIG. 5. Iyo PP inonyungudika inosangana nescuru pazasi (y = 0), pamusoro pekubata ne screw (y = 0.0022m) kupisa conduction kunoitika, kupisa kubva pasi, yokumusoro kupinda mukunyunguduka, tembiricha kubva kumativi maviri zvichidzika zvichidzika maitiro, kuita concave tembiricha curve. Nekuwedzera kwe screw speed, kumhanya kunowedzera, nguva yekupisa mumhanyi inoderera, uye tembiricha inoderera nekuwedzera kwenhamba yekuchinja. Sezvinoratidzwa muFIG. 6, iyo inooneka viscosity yekunyunguduka inotanga kuwedzera uyezve inoderera nekuwedzera kwe spiral urefu, Kusiyana neiyo tembiricha curve, iyo inooneka viscosity ndiyo yakaderera kumusoro kweiyo yakanyanya kunyunguduka tembiricha, uye iyo inooneka viscosity ndiyo yepamusoro-soro pakati pekupisa kwakadzika kunyunguduka. Nekuwedzera kwe screw speed, iyo inooneka viscosity yekunyunguduka yakakwirira uye yakakwirira, uye iyo inooneka viscosity kufanana inoderera. Zvinogona kuoneka kuti iyo inooneka viscosity yePP inonyunguduka yakatarisana nekushisa., iyo inoratidza kururama kwekufananidza.

Inogona kuonekwa kubva Figure 6 kuti viscosity haina kugadziriswa muFluent simulation, saka tinotora avhareji viscosity pakubuda kwehomogenization chikamu pa x = 0.01 here, nekuti viscosity inoshanduka pano kuburikidza nekuenzanisa data.

Iyo viscosity iri padyo neiyo theoretical calculation.

2.2 Kuyera uye Kuongorora kwePlasticizing kugona

Mushure mekutanga kupisa mushini wekuumba jekiseni, iyo polypropylene raw material inoiswa mufunnel yepurasitiki. Iyo inotenderera inotenderera parameter ye screw yakaiswa pa 120,140,160,180 rpm, kutonhora kwechikamu chehomogenized chakaiswa pa 220 °C, uye kunyungudika kunyunguduka muchikamu chehomogenizing chakaiswa pa 1.2 MPa. Nguva yekuchengetedza t pane imwe neimwe inotenderera inotenderera inorekodhwa nestopwatch, uyezve chikafu chisina chinhu chinoiswa.

Mushure mejekiseni, mushure mekunge jekiseni ratonhodzwa, the mass m yejekiseni inounganidzwa uye kuyerwa, uye iyo chaiyo plasticizing kugona mps inowanikwa ne mps = 1000m/t. Mhedzisiro yekuenzanisa neye theoretical plasticizing kugona mpt pasi pemamiriro akafanana inoratidzwa muFig. 7.

Mufananidzo 7 inoratidza kuti theoretical plasticizing simba uye screw speed ye screw inofungidzira basa

Nekuwedzera kwe screw speed, iyo plasticizing kugona kwe screw inowedzerwa, uye screw chaiyo

Rod plasticizing kugona yakaderera pane theoretical plasticizing kugona, iyo chaiyo plasticizing kugona kwejekiseni molding muchina nekumhanya kwe 120 ~ 180 rad / min accounts for 82% ~ 86% ye theoretical plasticizing kugona, zvichiratidza kuti jekiseni rekugadzira muchina screw plasticizing kugona kuri pamusoro peavhareji. 2.3 Kuongorora kukanganisa

Pane misiyano pakati peiyo chaiyo plasticizing kugona uye theoretical plasticizing kugona kwe screw, hapana chinopfuura pfungwa idzi: 1) chikamu chezvinyorwa zvinoumba firimu rakanyungudutswa panguva yeplasticizing process, zvichikonzera kubuda kwezvinhu; 2) Kubuda kwespiral pressure hakuna kutariswa mune theoretical plasticizing kugona kuongorora, izvo zvakaita kuti zvimwe zvinhu zvirambe zviri pamhepo. 3) Mukuwedzera kune kupisa kunoparidzirwa nebhari heater, iyo nyaya yakawanda kubva pakuveura kupisa kwe screw uye kukweshana pakati pezvinhu, zvichiita kuti kuparara kwekupisa kwechikamu chezvinyorwa.

Nekuwedzera kwe screw speed, iyo chaiyo plasticizing kugona iri kuderera, pane zvinotevera pfungwa: 1) Nekuwedzera kwe screw speed, kupisa kwekugera kwescuru kuri kuwedzera, zvichiita kuti kuparara kwekupisa kwechikamu chezvinyorwa; 2) Kuwedzera kwekushisa kunoderedza viscosity yezvinhu, inowedzera reverse pressure, kunotadzisa kufambira mberi kwezvinhu, uye inoita kuti simba replasticizing chairo riderere.

Mhedziso Nekuwedzera kwescrew groove kudzika, kufanana kwekushisa uye kuoneka viscosity kwakaderera, uye kugona kweplasticizing kwakawedzera, asi kurongeka kwemhando yechigadzirwa kwakadzikira. Kugona kweplasticizing kwakawedzera nekumhanyisa screw kuwedzera, asi kufanana kwekushisa uye kuoneka viscosity kwakadzikira nekuwedzera kwescrew speed. Kuwedzera tembiricha ye screw kunobatsira kusimudzira inooneka viscosity kufanana uye kuvandudza kunaka kwechigadzirwa.; Kuti uve nechokwadi chemhando yechigadzirwa uye nekuvandudza kugadzirwa kwehunyanzvi, kudzika, tembiricha uye screw speed inofanira optimized.