Tose tinoziva kuti zvigadzirwa zvepurasitiki zvinowanzova nedanho rekudonha, uye rinodzikira kana radzikira. Zvigadzirwa zvakagadzirwa nezvinhu zvakasiyana zvine mwero wekudonha kwakasiyana. Pano, tinokurukura zvinhu zvakati wandei zvinokanganisa kudonha kwemabhini epurasitiki panguva yekugadzira. Kutaura zvazviri, mukugadzira, kana uchida kuti saizi yechigadzirwa ive yakakodzera, zvinobatsira kunzwisisa zvinhu zvinokanganisa kudonha. Pamusoro pezvose, muindasitiri yezvekutakura zvinhu mumaindasitiri, midziyo yepurasitiki inowanzova midziyo yakajairika. Saizi yayo uye zvirevo zvayo zvakarurama zvichienderana nedanho, uye hapana kutsauka. Zvikasadaro, hazvigone kutaurwa kuti generalization yakajairika.
Maitiro ekuumbabhokisi repurasitiki rinochinjandiyo thermoplastic molding. Nekuda kwekuchinja kwehuwandu panguva yekugadzira mukuita kwekristaro, kushushikana kwemukati kwakakura, uye kune kushushikana kwakasara mukati mechinhu chemold, uye kurongeka kwemamorekuru kwakasimba kwazvo. Nokudaro, ine shrinkage rate yakakwira kupfuura zvigadzirwa zvepurasitiki zvethermosetting. Ine contraction range yakakura uye direction yakajeka. Sezvo jira rekunze rechinhu chakanyungudutswa richisangana nepamusoro pemold cavity panguva yechikamu chepurasitiki chakaumbwa, rinotonhodzwa pakarepo kuti riite low-density solid shell. Uye tese tinoziva kuti thermal conductivity yepurasitiki haina kunaka, uye jira remukati replastic turnover box rinotonhorera zvishoma nezvishoma, richigadzira jira rakasimba rine shrinkage rate yakakura. Kana madziro akakora zvishoma nezvishoma, jira rakasimba richakora uye richadzikira zvakanyanya.
Maitiro ekuumbabhokisi repurasitiki rinochinjandiyo thermoplastic molding. Nekuda kwekuchinja kwehuwandu panguva yekugadzira mukuita kwekristaro, kushushikana kwemukati kwakakura, uye kune kushushikana kwakasara mukati mechinhu chemold, uye kurongeka kwemamorekuru kwakasimba kwazvo. Nokudaro, ine shrinkage rate yakakwira kupfuura zvigadzirwa zvepurasitiki zvethermosetting. Ine contraction range yakakura uye direction yakajeka. Sezvo jira rekunze rechinhu chakanyungudutswa richisangana nepamusoro pemold cavity panguva yechikamu chepurasitiki chakaumbwa, rinotonhodzwa pakarepo kuti riite low-density solid shell. Uye tese tinoziva kuti thermal conductivity yepurasitiki haina kunaka, uye jira remukati replastic turnover box rinotonhorera zvishoma nezvishoma, richigadzira jira rakasimba rine shrinkage rate yakakura. Kana madziro akakora zvishoma nezvishoma, jira rakasimba richakora uye richadzikira zvakanyanya.
Chikero chekugadzira michina, saizi yekugoverwa kwezvinhu zvakabikwa, nezvimwe zvinhu zvinokanganisa zvakananga mafambiro ekuyerera, kugoverwa kwehuwandu hwezvinhu zvechigadzirwa, kudzikiswa kwekudzivirira uye nguva yekuumba, uye zvinokanganisa zvisina kunanga mwero wekuderera kwebhokisi repurasitiki rinochinja.Kana michina yacho iine nzvimbo yakananga yekupinza, chikamu chekupinza chinokura zvikuru, kunyanya kana chakakora, mwero wekupwanya uchava mudiki asi wakananga. Kusiyana neizvi, kana saizi yekupinza iri diki, nzira yekupwanya idiki, uye mwero wekupwanya wakakura kana nzvimbo yekupinza iri pedyo neinopinza kana kuti yakaenzana nenzira yekuyerera.
Mamiriro ekuumba ekugadzira ane simba guru padanho rekuderera kwebhokisi repurasitiki rinochinjaSemuenzaniso, kana tembiricha yemuforoma yakakwira uye zvinhu zvakanyungudutswa zvikafamba zvishoma nezvishoma, pane huwandu hwakawanda uye huwandu hwekupwanya huchava hwakakura. Zvinhu zvekristaro zvine kristallinity yakakura uye huwandu hwakawanda, saka huwandu hwekupwanya hunokura. Kugoverwa kwekushisa kwemuforoma uye huwandu hwekutonhorera kwemukati nekunze uye kufanana kwehuwandu hwezvikamu zvepurasitiki zvinokanganisa zvakananga mwero wekupwanya uye kutungamira kwechikamu chimwe nechimwe chechigadzirwa. Saizi yekumanikidzwa kwekuchengetedza uye hurefu hwenguva yekuchengetedza zvinewo simba guru pahuwandu hwekupwanya. Kana kumanikidzwa kwakakwira uye kwakareba, mwero wekupwanya udiki, asi kutungamira kwacho kwakakura. Munguva yekugadzira, mwero wekupwanya webhokisi rekuchinjana kwepurasitiki unogona kuchinjwa nemazvo nekugadzirisa tembiricha yemuforoma uye kumhanya kwekuisa pressure uye nguva yekutonhora. Zvichienderana nezviri pamusoro, tinogona kuona mwero wekupwanya wechikamu chimwe nechimwe chechigadzirwa zvichienderana nechimiro chepurasitiki chekuchinjana bhokisi rekupwanya madziro ukobvu chimiro chekudyisa feed inlet chimiro nehukuru uye kugoverwa kwechimiro chemuforoma, uye tobva taverenga saizi yemuforoma. Zvichienderana nehuwandu chaihwo hwekudzikira kwechigadzirwa, chinja moda kuchinja mamiriro ekuumba jekiseni kuti ugadzirise huwandu hwekudzikira kwechigadzirwa kuti chienderane nezvinodiwa chaizvo.
Nguva yekutumira: Mbudzi-25-2022