Acrylic injection molding process

Acrylic inonzi kemikari inonzi polymethyl methacrylate (PMMA muChirungu). Nekuda kwekukanganisa kwePMMA pamusoro kuomarara, nyore kukwenya, low impact resistance, urombo kuumbwa fluidity, Nekuti iyo IC tray ine huremu huremu, kugadziridzwa kwePMMA kwakaonekwa imwe mushure meimwe. Zvakadai secopolymerization yemethyl methacrylate ine styrene uye butadiene, kusanganiswa kwePMMA nePC, nezvimwewo.

Kuyerera kwePMMA kwakaipa kupfuura kwePS uye ABS, uye iyo yakanyunguduka viscosity inonyanya kunetseka nekushanduka kwekushisa. Munguva ye kuumba nzira, iyo melt viscosity inonyanya kuchinjwa kubva ku jekiseni tembiricha. PMMA iamorphous polima ine tembiricha yekunyunguduka inodarika 160°C uye tembiricha yekuora inosvika 270°C..

1. Plastic processing

PMMA ine imwe dhigirii yekunyura kwemvura, ine mwero wekutora mvura we 0.3-0.4%, uye humidity yekuumba jekiseni inofanira kunge iri pazasi 0.1%, kazhinji 0.04%. Kuvapo kwemvura kunokonzera mabubbles, mitsara yegesi, uye kuderedzwa kujeka mukunyunguduka. Saka inoda kuomeswa. Iyo tembiricha yekuomesa ndeye 80-90 ℃, uye nguva inopfuura 3 maawa. Zvinhu zvakadzokororwa zvinogona kushandiswa 100% Mune zvimwe zviitiko. Mari chaiyo inobva pane zvinodiwa zvehutano, kazhinji pamusoro 30%. Zvinhu zvakashandiswa patsva zvinofanirwa kudzivirira kusvibiswa, kana zvisina kudaro zvichakanganisa kujeka uye zvinhu zvechigadzirwa chakapedzwa.

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2. Jekiseni kuumba muchina sarudzo

PMMA haina zvakakosha zvinodiwa zvemajekiseni ekuumba michina. Nekuda kweiyo yakakwira melt viscosity, gomba rakadzika sikuruwa uye gomba hombe remuromo wemuromo rinodiwa. Kana kusimba kwechigadzirwa kwakakwirira, sikuruu ine hurefu hwakakura kusvika dhayamita reshiyo inofanira kushandiswa pakushomeka kwepurasitiki. Pamusoro pe, PMMA inofanira kuchengetwa muhopi yakaoma.

3. Mold uye gedhi dhizaini

The mold tembiricha inogona kuva 60 ℃-80 ℃, iyo dhayamita yemumhanyi mukuru inofanirwa kuenderana nemukati taper, kona yakanaka i5° kusvika 7°, kana uchida kubaya 4mm kana zvimwe zvigadzirwa, kona inofanira kuva 7 °, uye dhayamita yemumhanyi inofanira kusvika 8 kusvika 10mm, kureba kwegedhi hakufaniri kudarika 50mm. Kune zvigadzirwa zvine madziro ukobvu weasingasviki 4mm, dhayamita yemumhanyi inofanira kuva 6-8mm

Kune zvigadzirwa zvine madziro ukobvu kupfuura 4mm, mumhanyi dhayamita inofanira kuva 8-12mm. Diagonal, fan-shaped uye tabular gedhi kudzika kunofanirwa kuve 0.7 kusvika 0.9t (t ndiko kukora kwemadziro echigadzirwa), uye dhayamita yesuwo retsono inofanira kuva 0.8 kusvika 2mm; saizi diki inofanira kushandiswa kune yakaderera viscosity.

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Maburi emhepo akajairika ane hudzamu hushoma pane 0.05 uye hupamhi 6mm. Demolding angle iri pakati pe30′-1° uye 35′-1°30 ° mugomba chikamu.

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4. Kunyunguduka tembiricha

Inogona kuyerwa nemhepo jekiseni nzira: kubva 210 ° C kusvika 270 ° C, zvichienderana neruzivo rwunopihwa nemutengesi.

Bvisa chigaro chekumashure, ita kuti muromo wejekiseni rekuumba muchina usiye sprue bushing, and then manually perform plasticization injection molding, which is air injection molding.

5. Jekiseni tembiricha

Fast injection can be used, but to avoid high internal stress, it is advisable to use multi-stage injection, such as slow-fast-slow, Nekuti iyo IC tray ine huremu huremu, when injecting thick parts, use slow speed.

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6. Detention time

If the temperature is 260°C, the residence time cannot exceed 10 maminitsi, and if the temperature is 270°C, the residence time cannot exceed 8 maminitsi.

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