Shrinkage setting yejekiseni molding process

Zvinhu zvinokanganisa shrinkage ye thermoplastics ndezvizvi:

1. Plastic type:

Panguva yekuumbwa kwethermoplastics, kuchine zvimwe zvinhu zvakaita sekuchinja kwevhoriyamu nekuda kwekristaro, kushushikana kwakasimba kwemukati, kushushikana kukuru kwasara kwakaomeswa nechando muchikamu chepurasitiki, yakasimba mamolecular orientation, nezvimwewo, saka kana ichienzaniswa ne thermosetting mapurasitiki, shrinkage rate yakakura, shrinkage rate. range rakafara, uye directivity iri pachena.Pamusoro pezvo, iyo shrinkage rate mushure mekuumbwa kwekunze, annealing kana humidity conditioning kurapwa kazhinji yakakura kupfuura iyo thermosetting mapurasitiki.

2. Plastic chikamu maitiro:

Kana iyo yakanyungudutswa yasangana nepamusoro pegomba re mold, iyo yekunze layer inobva yatonhorwa kuita low density solid shell.Nekuda kwehurombo hwekupisa kwepurasitiki, chikamu chemukati chechikamu chepurasitiki chinotonhora zvishoma nezvishoma kuti chiite yakakwirira-density yakasimba layer ine shrinkage yakakura.Naizvozvo, avo vane madziro ukobvu, kunonoka kutonhora uye yakakwirira-density layer ukobvu vanozodzikira zvakanyanya.Uye zvakare, kuvepo kana kusavapo kwekuisa uye dhizaini uye huwandu hwekuisa hunokanganisa zvakananga kuyerera kwezvinhu, density kugovera uye shrinkage kuramba.Naizvozvo, hunhu hwezvikamu zvepurasitiki zvine simba rakakura pane shrinkage saizi uye kutungamira.

3. Feed inlet mhando, saizi uye kugovera:

Izvi zvinhu zvinokanganisa zvakananga kutungamira kwekuyerera kwezvinhu, density kugovera, kumanikidza kubata uye kudyisa maitiro uye nguva yekuumba.Iyo yakananga feed inlet uye yekudyira inlet ine hombe chikamu (kunyanya gobvu chikamu) ine shrinkage diki asi yakakura directivity, nepo feed inlet ine pfupi upamhi uye kureba ine diki directivity.Avo vari padyo nenzvimbo yekudyira kana kuenderana negwara rekuyerera kwezvinhu vachave nekuderera kukuru.

4. Mamiriro ekuumba:

Tembiricha ye mold yakakwira, iyo yakanyungudutswa inotonhora zvishoma nezvishoma, density yakakwira, uye shrinkage yakakura.Kunyanya kune iyo crystalline zvinhu, iyo shrinkage yakakura nekuda kweiyo yakakwirira crystallinity uye yakakura vhoriyamu shanduko.Iyo mold tembiricha yekugovera inoenderana zvakare nemukati uye kunze kutonhora uye density kufanana kwezvikamu zvepurasitiki, izvo zvinokanganisa zvakananga saizi uye kutungamira kwe shrinkage yechikamu chimwe nechimwe.

Panguvamold design, iyo shrinkage rate yechikamu chimwe nechimwe chechikamu chepurasitiki ichatemwa zvichienderana neruzivo maererano nehupamhi hwemapurasitiki akasiyana-siyana, ukobvu hwemadziro uye chimiro chechikamu chepurasitiki, chimiro, saizi uye kugoverwa kweiyo feed inlet, uye ipapo iyo saizi yegomba ichaverengerwa.

Kune yakakwirira-chaiyo zvikamu zvepurasitiki uye kana zvichinetsa kubata shrinkage rate, nzira dzinotevera dzinofanirwa kushandiswa kazhinji kugadzira mold:

① Iyo yekunze dhayamita yezvikamu zvepurasitiki ichave nediki shrinkage mwero, uye iyo yemukati dhayamita ichave yakakura shrinkage mwero, kuitira kusiya nzvimbo yekururamisa mushure mekuedzwa kwe mold.

② Iyo mold bvunzo inosarudza fomu, saizi uye kuumbwa mamiriro eiyo gating system.

③ Zvikamu zvepurasitiki zvinozogadziriswa mushure mekurapa zvichave pasi pekurapwa kuti uone shanduko yehukuru (chiyero chinofanira kuitwa maawa makumi maviri nemana mushure mekudhonzwa).

④ Gadzirisa mold zvinoenderana neiyo chaiyo shrinkage.

⑤ Edza mold zvakare uye shandura kukosha kwe shrinkage zvishoma nekushandura mamiriro ekugadzirisa zvakakodzera kuti asangane nezvinodiwa zvechikamu chepurasitiki.