Izvo zvivakwa uye maitiro maparamendi epurasitiki jekiseni molding zvinokanganiswa nezvakawanda zvinhu. Mapurasitiki akasiyana anofanirwa kugadzira maparamendi ekugadzira anokodzera zvivakwa zvavo kuitira kuti awane akanakisa emuchina zvivakwa.
Majekiseni ekuumba mapoinzi ndeaya anotevera:
Imwe, shrinkage rate
Izvo zvinhu zvinokanganisa kuumba shrinkage ye thermoplastic mapurasitiki ndeaya anotevera:
1.Marudzi emapurasitiki
| AIHWA. | Plastikizita | ShrinkageRate |
| 1 | PA66 | 1%–2% |
| 2 | PA6 | 1% -1.5% |
| 3 | PA612 | 0.5%–2% |
| 4 | PBT | 1.5%–2.8% |
| 5 | PC | 0.1%–0.2% |
| 6 | POM | 2%–3.5% |
| 7 | PP | 1.8%–2.5% |
| 8 | PS | 0.4%–0.7% |
| 9 | PVC | 0.2%–0.6% |
| 10 | ABS | 0.4%–0.5% |
2.Ukuru uye chimiro chekugadzira mold. Kuwedzera kukora kwemadziro kana kutonhora kwakashata system kunogona kukanganisa shrinkage. Mukuwedzera, kuvapo kana kusavapo kwekuisa uye kurongeka uye kuwanda kwekuisa zvinokanganisa zvakananga mafambiro ekuyerera, density kugovera uye shrinkage kuramba.
3.Chimiro, ukuru uye kugoverwa kwemuromo wezvinhu. Izvi zvinhu zvinokanganisa zvakananga kutungamira kwekuyerera kwezvinhu, density kugovera, kumanikidza kubata uye shrinkage mhedzisiro uye kugadzira nguva.
4.Mold tembiricha uye jekiseni kumanikidzwa.
Mold tembiricha yakakwira, density yakanyunguduka yakakwira, kuputika kwepurasitiki kukwira, kunyanya purasitiki ine yakakwira crystallinity. Iyo tembiricha yekugovera uye density kufanana kwezvikamu zvepurasitiki zvinokanganisawo zvakananga shrinkage uye kutungamira.
Kuchengeta kudzvanyirira uye nguva zvakare kune mhedzisiro pakumisikidza. High pressure, nguva refu inodzikira asi gwara racho rakakura. Naizvozvo, kana tembiricha yekuumbwa, kudzvanywa, jekiseni kuumba kumhanya uye kutonhora nguva uye zvimwe zvinhu zvinogona zvakare kuve zvakakodzera kushandura shrinkage yezvikamu zvepurasitiki.
Mold dhizaini zvinoenderana neyakasiyana epurasitiki shrinkage renji, epurasitiki madziro ukobvu, chimiro, feed inlet fomu saizi uye kugovera, zvinoenderana neruzivo rwekuona shrinkage yechikamu chimwe nechimwe chepurasitiki, wozoverenga saizi yegomba.
Kune yakakwirira-chaiyo zvikamu zvepurasitiki uye zvakaoma kubata shrinkage mwero, zvakafanira kushandisa nzira dzinotevera kugadzira mold:
a) Tora diki shrinkage yezvikamu zvepurasitiki mudhayamita yekunze uye shrinkage yakakura kuitira kuti ive nenzvimbo yekugadziridza mushure mebvunzo yekuumbwa.
b) Mold bvunzo yekuona iyo yekukanda system fomu, saizi uye mamiriro ekugadzira.
c) Saizi shanduko yezvikamu zvepurasitiki kuti zvigadziriswe zvakare zvinotemerwa mushure mekudzokorora (chiyero chinofanira kunge chiri maawa makumi maviri nemana mushure mekubviswa).
d) Shandura mold zvinoenderana neiyo chaiyo shrinkage.
e) Iyo inofa inogona kudzokororwa uye kukosha kwe shrinkage kunogona kugadziridzwa zvishoma nekushandura mamiriro ekuita zvakakodzera kuti asangane nezvinodiwa zvezvikamu zvepurasitiki.
Chepiri,Liquidity
- The fluidity of thermoplastics inowanzoongororwa nenhevedzano yezvinyorwa zvakadai se molecular weight, melt index, Archimedes spiral flow length, performance viscosity uye flow ratio (kuyerera kureba / plastiki rusvingo ukobvu). Kune mapurasitiki ezita rimwe chete, iyo yakatarwa inofanirwa kutariswa kuti ione kana fluidity yavo yakakodzera kuumbwa kwejekiseni.
Zvinoenderana nezvinodiwa mold dhizaini, iyo fluidity yemapurasitiki anowanzo shandiswa anogona kukamurwa kuita zvikamu zvitatu:
a) Mvura yakanaka yePA, PE, PS, PP, CA uye polymethylthyretinoene;
b) Medium flow polystyrene resin series (yakadai AS ABS, AS), PMMA, POM, polyphenyl ether;
c) Yakashata fluidity PC, yakaoma PVC, polyphenyl ether, polysulfone, polyaromatic sulfone, fluorine plastiki.
- Iyo fluidity yemapurasitiki akasiyana zvakare inoshanduka nekuda kweakasiyana ekuumba zvinhu. Zvikuru zvinofurira zvinhu ndezvizvi:
a) Tembiricha. Kupisa kwepamusoro kwezvinhu kuchawedzera mvura, asi mapurasitiki akasiyana zvakare akasiyana, PS (kunyanya kukanganisa kuramba uye yakakwirira MFR kukosha), PP, PA, PMMA, ABS, PC, CA plastiki liquidity ine tembiricha shanduko. Kune PE, POM, ipapo tembiricha inowedzera uye kudzikira haina pesvedzero pakushomeka kwavo.
b) Dzvinyiriro. Jekiseni inoumba kumanikidza inowedzera kunyunguduka neshear chiito, liquidity inowedzera, kunyanya PE, POM inonyanya kunzwa, saka nguva yejekiseni yekuumba kumanikidza kudzora kuyerera.
c) Kufa chimiro. Zvakadai sekudira system fomu, saizi, marongerwo, kutonhora system, exhaust system uye zvimwe zvinhu zvinokanganisa zvakananga kuyerera chaiko kwezvinhu zvakanyungudutswa mumhango.
Mold design inofanira kunge yakavakirwa pakushandiswa kwepurasitiki inoyerera, sarudza chimiro chinonzwisisika.Kuumba kunogonawo kudzora tembiricha yezvinhu, tembiricha yekuumbwa uye kudzvanywa kwejekiseni, kumhanya kwejekiseni uye zvimwe zvinhu kuti unyatso gadzirisa kuzadza kusangana nezvinodiwa zvekuumba.
Nguva yekutumira: 29-10-21