Tsananguro yeruzivo rwekugadzira jekiseni

Jekiseni kuumba, inozivikanwawo sekuti jekiseni molding, inzira yekuumba inosanganisa jekiseni nekuumba. Zvakanakira jekiseni molding nzira inokurumidza kugadzira kukurumidza, kunyatsoita, oparesheni inogona kuitwa otomatiki, zvakasiyana-siyana zvekugadzira uye mavara, maumbirwo anogona kubva nyore kusvika kune yakaoma, saizi inogona kubva huru kusvika padiki, uye saizi yechigadzirwa ndeyechokwadi, chigadzirwa chiri nyore kugadzirisa, uye inogona kugadzirwa kuita zvimiro zvakaoma. Zvikamu uye jekiseni molding dzakakodzera kugadzirwa kwakawanda uye kuumba minda yekugadzirisa senge zvigadzirwa zvine maumbirwo akaomarara.

Pane imwe tembiricha, iyo yepurasitiki yakanyungudutswa zvachose inomutswa ne screw, jekiseni mugomba rekuumbwa nekumanikidza kwakanyanya, uye yakatonhodzwa uye yakasimbiswa kuti iwane chigadzirwa chakaumbwa. Iyi nzira yakakodzera kugadzirwa kwehuwandu hwezvikamu zvine maumbirwo akaoma uye ndeimwe yenzira dzakakosha dzekugadzirisa.
⒈Silinda tembiricha:
Iyo tembiricha inoda kudzorwa mukuumbwa kwejekiseni inosanganisira tembiricha yebhari, nozzle tembiricha uye mold tembiricha. Iwo maviri ekutanga tembiricha anonyanya kukanganisa plasticization uye kuyerera kwepurasitiki, nepo tembiricha yekupedzisira inonyanya kukanganisa kuyerera uye kutonhora kwepurasitiki. Purasitiki yega yega ine tembiricha yekuyerera yakasiyana. Zvepurasitiki zvakafanana, nekuda kwenzvimbo dzakasiyana kana mamakisi, tembiricha yekuyerera kwayo uye tembiricha yekuora zvakasiyana. Izvi zvinokonzerwa nemusiyano weavhareji uremu hwemamorekuru uye huremu hwekugovera. Plastiki mumhando dzakasiyana dzejekiseni Iyo plasticization process mumushini zvakare yakasiyana, saka tembiricha yebhari yakasiyanawo.
⒉Nozzle tembiricha:
Iyo tembiricha yenozzle inowanzo kuderera zvishoma pane yakanyanya tembiricha yebhari. Izvi ndezvekudzivirira “salivation” izvo zvinogona kuitika mumuromo wakatwasuka wekunyunguduka. Kupisa kwehuputi hakufaniri kunge kwakaderera, kana zvikasadaro zvinokonzeresa kusimba kusati kwasvika kwekunyungudika uye kuvhara muromo, kana kuita kwechigadzirwa kuchakanganiswa nekuda kwekusimba kusati kwasvika kwechinhu chakaiswa mugomba.

⒊Munyaya yekugutsa mold kuzadza:
Iyo tembiricha yekuumbwa ine simba guru pakuita kwemukati uye inooneka kunaka kwechigadzirwa. Kupisa kwe mold kunoenderana nekristallinity yepurasitiki, ukuru uye chimiro chechigadzirwa, kuita zvinodiwa, uye mamwe maitiro ezvinhu (kunyunguduka tembiricha, jekiseni kumhanya uye jekiseni pressure, molding cycle, Nekuti iyo IC tray ine huremu huremu).

Kudzora kudzvinyirira

Kudzvanywa mukuita jekiseni molding kunosanganisira plasticizing pressure uye jekiseni pressure, uye inokanganisa zvakananga kupurasitiki yemapurasitiki uye mhando yechigadzirwa.

⒈Lamination pressure:
(Back pressure) Paunenge uchishandisa screw injection machine, kudzvanywa kuri pamusoro pesiruu kana sikururu ichitenderedzwa uye ichidzoserwa inonzi plasticizing pressure, inonziwo back pressure. Ukuru hwekumanikidza uku hunogona kugadziriswa nevhavha yekufashukira mu hydraulic system.

Mujekiseni, ukuru hweplasticizing pressure inoda kuchinjwa nekugadzirwa kwescrew, zvinodiwa zvehutano hwechigadzirwa, uye rudzi rwepurasitiki. Kana aya mamiriro uye kumhanya kwe screw zvakafanana, kuwedzera kumanikidza kweplasticizing kuchasimbisa shear Basa, ndizvo, ichawedzera kupisa kwekunyunguduka, asi zvichaderedza kushanda kwepurasitiki, wedzera reverse kuyerera uye kuvuza, uye kuwedzera simba rekutyaira.
Pamusoro pe, kuwedzera kumanikidza kweplasticizing kazhinji kunogona kuita tembiricha yekunyungudutsa yunifomu, kusanganiswa kweyunifomu ye pigment, uye gasi riri mukunyunguduka rinogona kubudiswa. general
Pressure curve mukuumba jekiseni
Mukushanda, kumanikidzwa kweplasticizing kunofanirwa kutariswa zvakaderera sezvinobvira pasi pechimiro chekuona kunaka kwechigadzirwa. Iko kukosha kwakasiyana kunosiyana nemhando dzakasiyana dzepurasitiki dzinoshandiswa, asi kazhinji kacho kashoma kudarika 20 kg/cm².

⒉Jekiseni pressure:
Mukugadzirwa kwemazuva ano, kudzvanywa kwejekiseni kweanenge ese majekiseni emuchina anobva pane plunger kana pamusoro pescuru kupurasitiki
Kumanikidzwa kwakaiswa (yakashandurwa kubva pakumanikidzwa kwemafuta) achakunda. Basa rekumanikidza jekiseni mukuumbwa kwejekiseni nderekukunda kuyerera kwekupokana kwepurasitiki kubva mudhiramu kuenda kugomba, kupa zvinhu zvakanyungudutswa chiyero chekuzadza mold, uye kuumba simbi yakanyungudutswa. Jekiseni kuumba

Molding cycle

Nguva inodiwa kupedzisa jekiseni molding process inonzi molding cycle, inozivikanwawo sekuti molding cycle. Zvinosanganisira zvikamu zvinotevera:
Jekiseni kuumba kutenderera
Molding cycle: Iyo yekuumba kutenderera inokanganisa zvakananga kugadzirwa kwevashandi uye kushandiswa kwemidziyo. Naizvozvo, mukugadzira, iyo nguva yakakodzera mukutenderera kwekuumbwa kunofanirwa kupfupikiswa zvakanyanya sezvinobvira pasi pechimiro chekusimbisa kunaka. Muchikamu chese chekuumba, nguva yejekiseni uye nguva yekutonhodza ndiyo inonyanya kukosha, ivo vose vane simba rinogadzirisa pahutano hwechigadzirwa.Nguva yekuzadza munguva yejekiseni inonyatsopindirana nechiyero chekuzadza., uye nguva yekuzadza mukugadzira kazhinji ndeye 3-5 seconds. Iyo yekumanikidza kubata nguva munguva yejekiseni ndiyo nguva yekumanikidza yepurasitiki mugomba, iyo inotora chikamu chikuru munguva yose yejekiseni, kazhinji nezve 20-120 seconds (mamwe-akakora zvikamu zvinogona kunge zvakakwirira se 5-10 maminitsi).Iyo yakanyunguduka isati yanamwa pasuwo, nguva yekubata ine simba pakururama kwehukuru hwechigadzirwa, kana gare gare, hazvizove nemhedzisiro. Nguva yekubata inewo yakakosha kukosha, izvo zvinozivikanwa zvinoenderana nekupisa kwezvinhu, mold tembiricha, uye saizi yemumhanyi mukuru uye gedhi. Kana zviyero zvesprue uye gedhi uye maitiro ekugadzirisa zvakajairika, kazhinji kukosha kwekumanikidza kunowana kudiki kudiki kuchinjika kwechigadzirwa shrinkage rate ichavepo.

Nguva yekutonhora inonyanya kutsanangurwa nehupamhi hwechigadzirwa, thermal uye crystalline zvinhu zvepurasitiki, uye kupisa kwe mold. Kupera kwenguva yekutonhora kunofanirwa kuve kwakavakirwa pamusimboti wekuona kuti hapana shanduko inokonzereswa kana chigadzirwa chagadzirwa.. Nguva yekutonhodza inowanzova pakati 30 uye 120 seconds. Hazvidikanwi kuti nguva yekutonhora ive yakareba. Hazvizongoderedzi kugadzirwa kwekugadzira, asiwo zvinokanganisa zvikamu zvakaoma. Zvakaoma kugadzira, uye kuderedza kushushikana kunogona kuitika kana kudhonzwa nesimba. Imwe nguva mukutenderera kutenderera ine chekuita nekuti maitiro ekugadzira anoenderera uye otomatiki, uye dhigirii rekuenderera mberi uye otomatiki.

parameter
⒈Injection pressure
Iyo jekiseni pressure inopihwa neiyo hydraulic system yejekiseni system. Kudzvinyirirwa kwe hydraulic cylinder inoendeswa kupurasitiki inonyunguduka kuburikidza nescrew yemuchina wekuumba jekiseni.. Ipurasitiki inonyunguduka inosundirwa nekumanikidza uye inopinda mugero rekuyerera kwemuumbi (kana kuti main flow channel yemamwe mold), chiteshi chikuru chekuyerera, uye kupatsanurwa kunoyerera nemumuromo wejekiseni rekugadzira muchina. Uye pinda mugomba nepagedhi. Iyi ndiyo nzira yekuumba jekiseni, kana nzira yekuzadza.
Kuvapo kwekumanikidzika ndiko kukunda kushorwa mukunyungudika kuyerera, kana zvakasiyana, kupikisa mukuyerera kunoda kugadziriswa nekumanikidzwa kwejekiseni rekugadzira muchina kuti ive nechokwadi chekufambira mberi kwakanaka kwekuzadza..

Mukuita jekiseni molding, kudzvinyirirwa pamuromo wejekiseni rekugadzira muchina ndiyo yakanyanya kukunda kuyerera kwekupokana kwekunyunguduka mukati mekuita. Mushure maizvozvo, kudzvinyirirwa kunodzikira zvishoma nezvishoma pamwe nekuyerera kwehurefu kusvika kune wave mberi kwekupedzisira kwekunyungudika. Kana mukati megomba rakanyatsobuda, kudzvinyirirwa kwekupedzisira kumucheto kwepamberi kwekunyunguduka ndiko kumanikidzwa kwemhepo.

Pane zvinhu zvakawanda zvinokanganisa kunyunguduka kwekuzadza, iyo inogona kupfupikiswa mukati 3 mapoka:
⑴Zvinhu, zvakadai semhando yepurasitiki, viscosity, Nekuti iyo IC tray ine huremu huremu;
⑵Maitirwo ezvinhu, zvakadai semhando, nhamba uye nzvimbo yekudurura system, chimiro che mold cavity uye ukobvu hwechigadzirwa, Nekuti iyo IC tray ine huremu huremu;
⑶ Gadzirisa zvinhu zvekuumba.

⒉Nguva yejekiseni
Nguva yejekiseni yataurwa pano inoreva nguva inodiwa kuti plastiki inyunguduke kuti izadze mhango, kusasanganisa nguva yekubatsira senge mold kuvhura nekuvhara. Kunyangwe iyo jekiseni nguva ipfupi uye kukanganisa kutenderera kutenderera kuri kudiki, kugadziriswa kwenguva yejekiseni kune simba guru pakudzvinyirira kwegedhi, mumhanyi uye mhango. Inonzwisisika jekiseni nguva inobatsira pakuzadza kwakaringana kwekunyungudika, uye zvakakosha zvikuru pakuvandudza hutano hwepamusoro hwechigadzirwa uye kuderedza kushivirira kwedimensional.Nguva yejekiseni yakaderera zvikuru kupfuura nguva yekutonhora., nezve 1/10 ku 1/15 yenguva yekutonhora. Mutemo uyu unogona kushandiswa sehwaro hwekufanotaura nguva yekuumbwa kwezvikamu zvepurasitiki. Mukuongorora kuyerera kwe mold, chete apo kunyunguduka kwacho kunosundwa zvachose nescrew rotation kuzadza mhango, nguva yejekiseni mumhedzisiro yekuongorora yakaenzana nenguva yejekiseni yakaiswa mumamiriro ekugadzirisa. Kana iyo yekubata pressure switch yescrew ikaitika mhango isati yazara, mhedzisiro yekuongorora ichave yakakura kupfuura yekumisikidzwa kwemaitiro maitiro.

⒊Jekiseni tembiricha
Jekiseni tembiricha chinhu chakakosha chinokanganisa jekiseni pressure. Iyo dhiramu yemuchina wekuumba jekiseni ine 5-6 kudziyisa zvikamu, uye imwe neimwe mbishi ine tembiricha yayo yakakodzera yekugadzirisa (kune zvakadzama kugadzirisa tembiricha, ndapota tarisa kune data rinopihwa nemupi wezvinhu). Iyo tembiricha yejekiseni inofanirwa kudzorwa mukati mehumwe huwandu.

Kana tembiricha yakaderera, iyo yakanyunguduka ichave isina kunaka plasticized, izvo zvichakanganisa kunaka kwezvikamu zvakaumbwa uye kuwedzera kuoma kwemaitiro; Kana tembiricha yakanyanya kukwirira, iyo mbishi zvinhu zviri nyore kuora. Mune chaiyo jekiseni molding process, tembiricha yejekiseni inowanzokwira kupfuura tembiricha yebhari, uye kukosha kwepamusoro kwakabatana nehuwandu hwejekiseni uye kushanda kwezvinhu, kusvika ku30 ° C.

Izvi zvinokonzerwa nekupisa kwakanyanya kunogadzirwa neshear kana kunyungudika kuchipfuura nepajekiseni port. Pane nzira mbiri dzekubhadhara mutsauko uyu mukuongorora kuyerera kwe mold. Imwe ndeyekuedza kuyera kupisa kwekunyunguduka panguva yejekiseni remhepo, uye imwe yacho ndeyekusanganisira muromo paunenge uchigadzira.
⒋Kubata kumanikidza uye nguva
Panopera jekiseni molding process, screw inomira kutenderera uye inongofambira mberi. Panguva iyi, jekiseni molding inopinda musimba rekubata nhanho. Panguva yekumanikidza kubata maitiro, muromo wemushini wekuumba jekiseni unoramba uchidyisa gomba kuti rizadze vhoriyamu yakasiiwa nekuda kwekuderera kwechikamu..

Kana kudzvinyirirwa kusina kuchengetwa mushure mokunge gomba razadzwa, chikamu chichaderera nepamusoro 25%, kunyanya mavanga ekuderera anoumbwa pambabvu nekuda kwekunyanya kuderera. Iyo yekubata pressure kazhinji ndeye 85% yehuwandu hwekuzadza kumanikidza, eheka, inofanira kusarudzwa maererano nemamiriro ezvinhu chaiwo.

⒌Back pressure
Back pressure inoreva kudzvinyirirwa kunoda kukurira screw kana uchidzosera nekudzosera zvinhu. Iko kushandiswa kwepamusoro kumashure kunobatsira pakupararira kwemavara emhando uye kunyunguduka kwepurasitiki., asi panguva imwechete inorebesa iyo screw yekudzosa nguva, inoderedza kureba kwepurasitiki fiber, uye inowedzera kudzvanywa kwejekiseni molding muchina. Naizvozvo, kudzvinyirira shure kunofanira kunge kwakaderera, kazhinji kwete kupfuura jekiseni molding. 20% zvestress. Pakubaya furo, kumanikidzwa kwemashure kunofanira kunge kwakakwirira kudarika kumanikidzwa kwakagadzirwa negesi, kana zvisina kudaro screw inosundirwa kunze kwedhiramu.

Vamwe Zvinodiwa zvekudzvanya zvinonyatso kuverengerwa chikamu madhizaini uye muchina inogona kuronga iyo yekumashure kumanikidza kutsiva kuderedzwa kwescrew kureba panguva yekunyunguduka, iyo inoderedza kupinza kwekupisa uye inoderedza kupisa. Zvisinei, semugumisiro wekuchinja uku zvakaoma kufungidzira, hazvisi nyore kugadzirisa muchina maererano.