Rotational Molding(BrEkuumba) chinosanganisira mold inodziya iyo inozadzwa nechaji kana kupfura huremu hwezvinhu.Iyo inobva yatenderedzwa zvishoma nezvishoma (kazhinji yakatenderedza maviri perpendicular axes) zvichiita kuti zvinhu zvakapfava zvipararire uye zvinonamira kumadziro eforoma.Kuti uchengetedze kunyange ukobvu mukati mechikamu chose, mold inoramba ichitenderera nguva dzese panguva yekupisa uye kudzivirira sagging kana deformation zvakare panguva yekutonhora.Iyo nzira yakashandiswa kumapurasitiki muma1940s asi mumakore ekutanga yaisashandiswa zvishoma nekuti yaive nzira inononoka inongowanikwa kune mashoma mapurasitiki.Mumakumi maviri emakore adarika, kuvandudzwa kwemaitiro ekudzora uye kuvandudzwa nehupfu hwepurasitiki zvakakonzera kuwedzera kukuru kwekushandiswa.
Rotocasting (inozivikanwawo sekuti rotacasting), nekuenzanisa, inoshandisa marezeni ekuzvirapa muforoma isina kupisa, asi inogovera kumhanya kunononoka kunoenderana neinotenderera.Spincasting haifanirwe kuvhiringika pamwe, kushandisa yekuzvirapa resin kana simbi chena mune yakakwira yekumhanya centrifugal yekukanda muchina.
Nhoroondo
Muna 1855 R. Peters weBritain akanyora kushandiswa kwekutanga kwebiaxial rotation uye kupisa.Iyi inotenderera yekuumba nzira yakashandiswa kugadzira simbi artillery shells nemimwe midziyo isina maburi.Chinangwa chikuru chekushandisa kutenderera kuumbwa kwaive kugadzira kuenderana mukukora kwemadziro uye density.Muna 1905 muUnited States, FA Voelke akashandisa nzira iyi pakuchera zvinhu zvewakisi.Izvi zvakaita kuti GS Baker's neGW Perks vagadzirise mazai echokoreti asina buri muna 1910. Kuumbwa kwekutenderera kwakaenderera mberi uye RJ Powell akashandisa nzira iyi kuumba plaster yekuParis kuma1920s.Idzi nzira dzekutanga kushandisa zvinhu zvakasiyana dzakatungamira kufambira mberi munzira yekutenderera kuumbwa kunoshandiswa nhasi nemapurasitiki.
Plastics akaunzwa kune inotenderera yekuumba maitiro mukutanga kwema1950s.Imwe yemashandisirwo ekutanga yaive yekugadzira misoro yezvidhori.Muchina uyu wakagadzirwa nemuchina weE Blue bhokisi-ovheni, wakafuridzirwa neGeneral Motors rear axle, inofambiswa nemota yemagetsi yekunze uye inopisa nepasi-yakaiswa gasi rinopisa.Iyo mold yakagadzirwa ne electroformed nickel-copper, uye purasitiki yaive yemvura PVC plastisol.Nzira yekutonhodza yaisanganisira kuisa mold mumvura inotonhora.Iyi nzira yekutenderera inotenderera yakakonzera kugadzirwa kwemamwe matoyi epurasitiki.Sezvo kudiwa uye kufarirwa kweiyi maitiro kwakawedzera, yakashandiswa kugadzira zvimwe zvigadzirwa senge macones emumugwagwa, marine buoys, uye mota dzemaoko.Kukurumbira uku kwakaita kuti pave nemichina mikuru.Imwe hurongwa hutsva hwekudziya hwakagadzirwawo, kubva kune yekutanga gasi jets kuenda kune yazvino indirect high velocity air system.MuEurope mukati ma1960 maitiro eEngel akagadzirwa.Izvi zvakabvumira kusikwa kwemidziyo mikuru isina maburi kuti igadzirwe mune yakaderera-density polyethylene.Nzira yekutonhodza yaisanganisira kudzima zvinopisa uye kubvumira plastiki kuoma ichiri kuzununguka muforoma.[2]
Muna 1976, iyo Association of Rotational Moulders (ARM) yakatangwa muChicago semubatanidzwa wepasi rese wekutengeserana.Chinangwa chikuru chemubatanidzwa uyu ndechekuwedzera ruzivo rwekutenderera kuumba tekinoroji uye maitiro.
Mumakore ekuma1980, mapurasitiki matsva, akadai sepolycarbonate, polyester, uye naironi, akaunzwa mukuumbwa kunotenderera.Izvi zvakakonzera kushandiswa kutsva kwemaitiro aya, sekugadzira matangi emafuta uye kuumbwa kwemaindasitiri.Tsvagiridzo yakaitwa kubva mukupera kwema1980s paQueen's University Belfast yakatungamira mukuvandudzwa kwekunyatso tarisisa uye kutonga kwemaitiro ekutonhodza zvichienderana nekuvandudza kwavo "Rotolog system".
Equipment uye tooling
Rotational molding machines inogadzirwa muhupamhi hwehukuru.Iwo anowanzo sanganisira mold, ovheni, kamuri yekutonhodza, uye mold spindles.Mishonga inosungirirwa pane imwe axis inotenderera, iyo inopa yunifomu yepurasitiki mukati me mold imwe neimwe.
Molds (kana tooling) inogadzirwa kubva kune welded sheet simbi kana kukanda.Nzira yekugadzira inowanzotungamirirwa nehukuru hwechikamu uye kuoma;Zvikamu zvakaomarara zvinogona kunge zvakagadzirwa nemidziyo yekukandira.Molds inowanzogadzirwa kubva kusimbi isina tsvina kana aluminium.Aluminium molds anowanzo kukora kupfuura akaenzana esimbi mold, sezvo iri simbi yakapfava.Ukobvu uhwu haukanganisi nguva dzekutenderera zvakanyanya sezvo aluminium yekupisa yekupisa kwakapetwa kakawanda kupfuura simbi.Nekuda kwekudiwa kwekugadzira modhi isati yaitwa, molds dzinowanzova nekuwedzera mari inoenderana nekugadzirwa kwechishandiso, nepo simbi yakagadzirwa kana aluminium molds, kunyanya kana ichishandiswa kune isinganyanyi kuomesesa, isingadhure.Zvisinei, mamwe mold ane zvose aluminium nesimbi.Izvi zvinobvumira kushanduka kwakasiyana-siyana mumadziro echigadzirwa.Nepo maitiro aya asina kujeka sekuumbwa kwejekiseni, anopa mugadziri mamwe sarudzo.Iyo aluminium yekuwedzera kune simbi inopa huwandu hwekupisa huwandu, zvichiita kuti kunyunguduka-kuyerera kurambe kuri mumamiriro emvura kwenguva yakareba.
Nguva yekutumira: Aug-04-2020