Kafukufuku pa Zotsatira za Screw Rotation Speed ​​of Injection Molding Machine pa Plasticizing Luso ndi Viscosity Yowonekera

0 Mawu Oyamba

Jekeseni akamaumba makina ndi chida chachikulu akamaumba pulasitiki, makamaka ndi jekeseni dongosolo.System, clamping system, kayendedwe ka magetsi, dongosolo mafuta, hydrostatic transmission system,Kutentha ndi kuzirala, dongosolo lowunika chitetezo, etc.. Kupititsa patsogolo khalidwe lazinthuKuchuluka, kupanga bwino, kuchepetsa kugwiritsa ntchito mphamvu, anthu achita kafukufuku wozama pa izo.Kafukufuku wa makina opangira jekeseni ali ndi mbali zambiri, Kuphatikizira dongosolo lamagetsi lamagetsi.Intelligent transformation.Servo transformation of transmission systems. screw ndiye pachimake cha makina opangira jakisoni Zida zamtima, omwe magawo ake amatsimikizira kuchuluka kwa jekeseni wa makina a jakisoni, ofufuza aphunziraMore. Kufanana kwa pulasitiki kwa wonongazo kumayimira kubwerezabwereza kwa chinthucho. M'mene muyeso umakwera kwambiri, mawonekedwe a magwiridwe antchito a plasticizing uniformity akuwoneka viscosity. Momwe kusinthidwa kwa wononga mawonekedwe kumathandiza kuchepetsa kukhuthala kowonekera kwa kusungunuka., screw.

Kuthekera kumatsimikiziridwa ndi mawonekedwe a screw ndi liwiro la wononga, kupanikizika, liwiro, kutentha, etc.Ndiye gawo lalikulu kuyeza magwiridwe antchito a screw. Wang XishKusungunuka kwa jekeseni screwBody transport kudawunikidwa mwaukadaulo. Li Zhenget The effects of temperature and back pressure on snailInfluence of rod plasticizing ability. Kuchuluka kwa pulasitiki kumayimira mphamvu ya kupanga makina opangira jakisoni,M'pofunika kusintha plasticizing luso wononga kwa phindu zachuma mabizinesi.

Kuthekera kwa pulasitiki kwa ndodo kumatanthawuza mtundu wa zinthu zopangidwa ndi pulasitiki pa nthawi imodzi ya makina opangira jekeseni., ndi kutuluka kwa wononga gawo homogenization Kulumikizidwa ndi chipinda choyezera, voliyumu pa kotulukira kwa wononga wononga homogenizing gawo akhoza kuyeza.The plasticizing luso wononga anatsimikiza ndi chiphaso mlingo.Pa kusankha zipangizo zipangizo., kukhuthala kumakhudzidwa kwambiri ndi kumeta ubweya wa ubweya ndi kutentha.. PepalaliMunda wotuluka wa PP umasungunuka mu gawo la homogenizing la screw umawunikidwa ndi Fluent software..

Kugwiritsa ntchito njira yofufuzira yophatikiza kuyesa ndi kusanthula kwamalingaliro, kuzungulira kwa screw

Zotsatira za kuya kosiyanasiyana kwa wononga pa kutentha, kukhuthala kowonekera, liwiro ndi luso la plasticizingKuchuluka kwa voliyumu pakutuluka kwa screw homogenizing gawo kumawunikidwa kuti kukhathamiritsa liwiro la Screw la magawo opangira makina opangira jakisoni..

1 Kusanthula kwamalingaliroMu pepala ili, The homogenization ya LYH680 pulasitiki jekeseni akamaumba makina amayeseredwa ndi Fluent., khazikitsani liwiro losiyana siyana, Kuwunika kwa gawo la homogenization la chitoliroMlingo wodutsa wa volumetric pakutuluka kwa gawo la propylene fluid homogenization wapezeka.. Gawo lamakina omangira jekeseniMagawo oyenera ndi: kutalika kwa gawo homogenized wa wononga ndi 80 mm, ndi kutentha kwa mbiya mu gawo homogenizing ndi setSet pa 220 C, kusungunula kuthamanga mu gawo homogenizing ndi 1.5 MPa, ndipo kuya kwa screw groove ndi 2.2Mm, screw screw angle ndi 17.66 °, screw length-diameter ratio ndi 19.6, screw m'mimba mwake 32 mm; Kusungunuka kwamphamvu kwa polypropylene (PP) anali 770 kg / m3 Malo osungunuka ndi 170 °C, Thermal conductivity coefficient of the melt ndi 0.182W / (m · °C), ndi chiŵerengero chosungunukaKutentha kwa kutentha kwa 2900 J / (kg · C), Sungunulani mamasukidwe akayendedwe a 421 Pa · s (453 K / 320)Pa·s (463 K)/250 Pa·S (473 K)。 Mu ntchito zomangamanga, ganizirani zamadzimadziKachulukidwe kake kamasintha pang'ono chifukwa chakuti polima wosungunuka amametedwa mu makina omangira jekeseni akapangidwa kale.Mlingo wa kukameta ubweya ndi wocheperapo poyerekeza ndi makina opangira jekeseni. 10-3 m / s, pa nthawi imene kusungunula ili mu sanali Newtonian rheological dera loyamba M'chigawo chino, polima yosungunuka imatha kuwonedwa ngati madzimadzi a Newtonian, chifukwa chake kusungunuka kwa PP kumawonedwa ngati chowongoka chosakanikirana ndi madzi a Newtons pakuwunika koyesa ndi kuyesa..

• Kukhazikitsa dongosolo la coordinate

Njira yozungulira yoyambira yomwe zinthu zimadutsamo imatambasulidwa munjira ya cuboid,Chitsanzo cha danga cha mbali zitatu chomwe chinapangidwa kuchokera pachiyambi chikuwonetsedwa pazithunzi 1 ku Figure 3.

1.2 Kukhazikitsidwa kwa Fluid Governing Equation (Phi) + div (p f) = div (γ gradphi) + S. (1) Kumene φ ndi kusinthasintha kwa thupi; The generalized diffusion coefficient yolingana ndi phi; S ndi liwu lachidziwitso lodziwika bwino.

Malinga ndi njira ya Guangyi, equation ya kusungidwa kwa misa ndi mphamvu imakhazikitsidwa pakhomo la gawo la homogenization la x-y ndege (z = 0).

dV

r

Z = – mwa pb + π F + d V.

(2) Mu dt formula: rho ndiye kuchuluka kwa kusungunuka, kg / m3; Vz ndi liwiro loyenda mu z mbali, m / s, kulowa mu ozungulira poyambira mu homogenization dera; F ndiko kuthamanga kwa mphamvu yokoka, m / s2; Pb ndi back pressure, Pa; Ndi viscosity yosungunuka,

Pa·s; T kwa nthawi, s; ▽ ndi Hamiltonian，▽= ∂ i+ ∂ j+ ∂ k。 ∂x ∂y ∂z

Equation (2) ndiye liwiro la equilibrium equation (N-S equation) wa viscous fluid, madzi amadzimadzi mu spiral groove amawonedwa ngati kutuluka kwa isothermal; Ma viscosity ndi kachulukidwe minda ndi ofanana. M'lifupi mwake mozungulira poyambira ndi wamkulu kwambiri kuposa kuya kwa spiral groove, ndipo zotsatira za wononga khoma la mbali zimanyalanyazidwa. Kusungunula kumayenderera kwathunthu pa screw channel, kunyalanyaza kutuluka kwa cholowetsa ndi kutuluka, koma poganizira zotsatira za kupsyinjika kwa msana. N-S equation imasinthidwa mosavuta ndi zomwe zili pamwambapa:

2

dp

dy=1·b。 (3) ndi dx

Phatikizani y kawiri ndikupereka malire (y = 0, vz = 0; Y = h, Vz = π NDcos theta / 60). Kuthamanga kwa kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe kabwino ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe kamwemwe kapabumwemwemwemwemwedwedha lugha kuyiyidwetsikiridwe yi kapamba kachachititsidwe kaya zikhale zotani zimapezedwa, ndiye

NDyπ cos theta hy-y2pb

vz = 120h – 2ndi × Lsintheta. (4)

Kumene h ndi kuya kwa wononga poyambira mu homogenization gawo, m; Ngongole ya helix ya screw, (°); L ndi kutalika kwa gawo la homogenized, m; N ndi screw speed, r ndi d / m ine n; D ndi mainchesi owongoka a screw rod, m.

1.3 Kuwerengera kwa theoretical plasticizing capacity

Kusintha Eq. (4) mu equation tanthauzo la flow, Q = WhVz = π DhVzsynthesizer, amapereka

22 32

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

Phokoso. (5) 120 12 L ku: W ndi m'lifupi mwa gawo lamadzimadzi, m; MPT ndiye Theoretical Plastic of Screw Type Plastic Injection Molding Machine

Chemical mphamvu, kg / s; Q ndi voliyumu chiphaso mlingo wa Sungunulani homogenization gawo, m3 / s. Kupyolera mu equation (5), zitha kuwoneka kuti kuthekera kwa pulasitiki kwa wononga kumakhudzidwa ndi magawo osiyanasiyana azinthu monga screw diameter, screw groove angle, Sungunulani kuthamanga ndi kuzama kwa screw groove. Kukwera kwa wononga liwiro, mphamvu ya plasticizing; Pamene zikuoneka mamasukidwe akayendedwe a Sungunulani kumawonjezera, Kuthekera kwa pulasitiki kumawonjezeka.

Zotsatira zoyeserera ndi kusanthula kayeseleledwe

2.1 Kusanthula kayeseleledwe ndi zotsatira

1) Zoyenera kusanthula kayeseleledwe.

Nkhope yolowera kumapeto: kuchokera kumayendedwe a liwiro la kugawa kwa z komwe kumasungunuka (monga (4)), liwiro la polowera gawo la homogenizing limasintha ndi mtengo wa y. Tsopano N = 120, 140, 160, 180 rad / min amalowetsedwa mu Vz motsatana, ndi liwiro loyambirira lofananira motsatira njira yozungulira pakhomo la gawo la homogenization limatsimikiziridwa kudzera mu tanthauzo la ntchito ya Fluent ndi chilankhulo chake cha pulogalamu ya UDF., ndiye, liwiro loyambirira pansi pamikhalidwe yoyeserera komanso yoyezera; Chifukwa kupsinjika kwa kusungunula komwe kumalowera ndikotsika kwambiri kuposa kuthamanga kwa mutu wa screw, kupsyinjika pa malowedwe a gawo homogenization ndi 0; Malinga ndi magawo ndondomeko ya PP zinthu ndi zipangizo, a

Kutentha kosungunuka kwakhazikitsidwa 465 K. Makoma akumanzere ndi kumanja: yz ndege (x = 0), (x zofanana 3.2 × 10-2 m) monga zigawo za homogenization

Mbali ziwiri za khoma la screw groove zimayikidwa ngati makoma osatsetsereka, ndipo kutentha kosungunuka ndi kutentha kwa wononga, zomwe zakhazikitsidwa 473 K malinga ndi mawonekedwe a PP ndi momwe zida ziliri.

Pamwamba ndi pansi sidewalls: x-z ndege (y = 0), (y = 2.2 × 10-3 m) monga m'munsi ndi chapamwamba mbali ya wononga poyambira wa homogenization gawo, mbali yapansi imatengedwa ngati khoma lopanda kutsetsereka, kutentha kwa sungunula ndi kutentha kwa screw, ndipo kutentha kwakhazikitsidwa 473 K malinga ndi mawonekedwe a PP ndi momwe zida ziliri; Mbali yakumtunda kwa screw groove mu gawo la homogenization ndikulumikizana pamwamba pa sungunula ndi mbiya., kusungunuka kwachangu ndikokwanira, ndipo kutentha kwa kutentha kumafanana ndi kutentha kwa mbiya, zomwe zakhazikitsidwa 493 K malinga ndi momwe zinthu ziliri pakupanga zinthu za PP.

Nkhope yotuluka: x-y ndege (z = 0.264 m) monga kubwereketsa kwa gawo la homogenization, malire otulutsa mphamvu amatengedwa, kumene kupanikizika kuli kotsutsana ndi z malangizo, ndipo kupanikizika kumayikidwa kuti kufanane ndi zida zoyesera kuti zifufuze mosavuta ndi kuyerekezera, ndipo kukakamizidwa kumbuyo kumayikidwa -1.2 MPa.

• Zotsatira za kusanthula kayeseleledwe

za x = 0.01, chithunzi chopindika cha liwiro, kutentha ndi mamasukidwe akayendedwe pa kutuluka kwa gawo homogenization monga ntchito ya kuya kwa ozungulira poyambira zikuwonetsedwa mu Zithunzi. 4 kuti 6.

Tikuwona kuchokera pa Chithunzi 4 kuti ndi kuchuluka kwa screw liwiro, liwiro la homogenization gawo pa kutuluka kumawonjezeranso, ndi kuchuluka kwa kuya kwa screw groove, liwiro limayamba kuchepa kenako limawonjezeka, zomwe zimachitika chifukwa cha kukameta ubweya wa ubweya ndi kukhuthala kwapamwamba komanso kumunsi kwa wononga groove., mogwirizana ndi madzimadzi a polima mu mbale.

Kusintha pakati. Monga tikuonera pa Chithunzi 4, ndi kuchuluka kwa screw speed, Kuthamanga kwa gawo la homogenizing kumawonjezekanso. Ndi kukula kwa groove kuya, liwiro limachepa poyamba ndiyeno limawonjezeka. Izi ndichifukwa cha mphamvu yayikulu yometa ubweya komanso kukhuthala kwapamwamba komanso kumunsi kwa groove., zomwe zimagwirizana ndi kusintha kwa madzi a polima pakati pa mbale. Kusintha kwa kutentha mumayendedwe a radial monga momwe FIG ikuwonetsera. 5. Kusungunuka kwa PP kumalumikizana ndi screw pansi (y = 0), pamwamba kukhudzana ndi screw (y = 0.0022m) kutentha conduction kumachitika, kutentha kuchokera pansi, chapamwamba kusungunuka, kutentha kuchokera kumbali zonse kulowera pansi, kupanga concave kutentha pamapindikira. Ndi kuwonjezeka kwa screw speed, liwiro likuwonjezeka, nthawi yotentha mu wothamanga imachepa, ndipo kutentha kumachepa ndi kuwonjezeka kwa chiwerengero cha zosinthika. Monga zikuwonetsedwa mu FIG. 6, kukhuthala kowonekera kwa kusungunula koyamba kumawonjezeka ndiyeno kumachepa ndi kuchuluka kwa kutalika kwa spiral, Mosiyana ndi kutentha kopindika, kukhuthala kowoneka ndi kotsikitsitsa pamwamba pa kutentha kwambiri kusungunula, ndi mamasukidwe akuoneka ndi apamwamba kwambiri pakati pa otsika kutentha kutentha. Ndi kuwonjezeka kwa screw speed, kukhuthala kowonekera kwa kusungunuka kumakhala kokwera komanso kokwera, ndipo mawonekedwe a viscosity owoneka bwino amachepetsa. Zitha kuwoneka kuti kukhuthala kowonekera kwa PP kusungunuka kumayenderana ndi kutentha., zomwe zimasonyeza kulondola kwa kayeseleledwe.

Itha kuwoneka pa Chithunzi 6 kuti mamasukidwe akayendedwe si okhazikika mu kayeseleledwe Mwaluso, kotero timatenga mamasukidwe akayendedwe wapakati pa kutuluka kwa gawo homogenization pa x = 0.01 Imagwiranso ntchito ngati cholandirira batire ndi mota komanso komwe kuli mabwana osiyanasiyana opangira ma screw omwe azigwiritsidwa ntchito kulumikizitsa chipangizocho pokhapokha mbali zamkati zitasonkhanitsidwa., chifukwa mamasukidwe akayendedwe amasintha pano kudzera mu kuyerekeza deta.

The mamasukidwe akayendedwe amene ali pafupi ndi ongoyerekeza mawerengedwe.

2.2 Kuyeza ndi Kusanthula mphamvu ya Plasticizing

Pambuyo preheating jekeseni akamaumba makina, polypropylene yaiwisi imayikidwa muzitsulo za pulasitiki. Kuthamanga kozungulira kozungulira kwa screw kumayikidwa 120,140,160,180 rpm pa, kutentha kwa gawo homogenized wayikidwa pa 220 °C, ndi kusungunula kuthamanga mu gawo homogenizing wayikidwa pa 1.2 MPa. Nthawi yosungirako t pa liwiro lililonse lozungulira imalembedwa ndi stopwatch, ndiyeno chakudya chopanda kanthu chimayikidwa.

Pambuyo jekeseni, jekeseniyo itakhazikika, unyinji wa m wa jakisoni amasonkhanitsidwa ndikuyezedwa, ndipo mphamvu yeniyeni ya pulasitiki mps imapezedwa ndi mps = 1000m/t. Zotsatira zofananitsa ndi luso laukadaulo la plasticizing mpt pansi pamikhalidwe yomweyi zikuwonetsedwa mkuyu. 7.

Chithunzi 7 zikuwonetsa kuti mphamvu yopangira pulasitiki ndi liwiro la wononga wononga pafupifupi ntchito

Ndi kuwonjezeka kwa screw speed, Kuthekera kwa pulasitiki kwa screw kumawonjezeka, ndi screw screw yeniyeni

Kuthekera kwa pulasitiki ndi ndodo ndikotsika kuposa luso laukadaulo lopangira pulasitiki, luso lenileni plasticizing wa jekeseni akamaumba makina pa liwiro la 120 ~ 180 rad / min akaunti za 82% ~ 86% luso laukadaulo la plasticizing, kusonyeza kuti jekeseni akamaumba makina wononga plasticizing luso ndi pamwamba mlingo wapakati. 2.3 Kusanthula zolakwika

Pali kusiyana pakati pa luso lenileni la plasticizing ndi theoretical plasticizing luso la screw, palibe choposa mfundo izi: 1) gawo la zinthu zimapanga filimu yosungunuka panthawi ya plasticizing, kuchititsa kutayikira kwa zinthu; 2) Kutayikira kwa kuthamanga kwa spiral sikunaganiziridwe pakuwunika kwaukadaulo kwaukadaulo, zomwe zidapangitsa kuti zida zina zizikhala pamphepete mwa ozungulira. 3) Kuphatikiza pa kutentha komwe kumaperekedwa ndi chowotcha mbiya, zinthu zambiri kuchokera kukameta ubweya wa ubweya wa screw ndi kukangana pakati pa zipangizo, kuchititsa kuwonongeka kwa kutentha kwa gawo la zinthuzo.

Ndi kuwonjezeka kwa screw speed, luso lenileni la plasticizing likuchepa, pali mfundo zotsatirazi: 1) Ndi kuwonjezeka kwa screw speed, kumeta ubweya wa tsitsi kumawonjezeka, kuchititsa kuwonongeka kwa kutentha kwa gawo la zinthuzo; 2) Kuwonjezeka kwa kutentha kumachepetsa kukhuthala kwa zinthu, kumawonjezera reverse pressure, imalepheretsa kupita patsogolo kwa nkhaniyo, ndipo imapangitsa kuti mphamvu yeniyeni ya plasticizing ichepe.

Pomaliza Ndi kuwonjezeka kwa wononga poyambira kuya, kufanana kwa kutentha ndi kukhuthala koonekera kunachepa, ndipo luso la pulasitiki likuwonjezeka, koma kulondola kwamtundu wazinthu kudachepa. Kuthekera kwa pulasitiki kumawonjezeka ndikuthamanga kwa screw, koma kufanana kwa kutentha ndi kukhuthala koonekera kunachepa ndi kuwonjezeka kwa wononga liwiro. Kuchulukitsa kutentha kwa wononga kumathandizira kulimbikitsa mawonekedwe a viscosity ndikuwongolera kulondola kwazinthu.; Pofuna kuonetsetsa kuti zinthu zili bwino komanso kuti ntchitoyo ikhale yabwino, kuya, kutentha ndi wononga liwiro ayenera wokometsedwa.