Egal um was für Plastik es sich handelt, es hat eine gewisse schrumpfrate. Wenn es nicht richtig gesteuert wird, es führt direkt zu einer Änderung der Größe der Spritzgussteile. Wenn die Änderung zu groß ist, it will directly lead to the unqualified quality of the injection molding products. This is a period that many injection molding factories do not want to see, and the three major factors affecting the dimensional change of injection molding parts.
1. Wrong selection of injection molding materials
The shrinkage of injection molding materials has little effect on the dimensional accuracy of plastic parts. If the precision of molding equipment and mold is very low, but the shrinkage rate of molding material is very small, it is very easy to ensure the dimensional accuracy of plastic parts. Im Allgemeinen, the smaller the shrinkage of molding material is, the more difficult it is to ensure the dimensional accuracy of plastic parts. Deshalb, in the selection of molding resin, it is necessary to fully consider the influence of shrinkage rate of raw materials on the dimensional accuracy of plastic parts. For the selected raw materials, the variation range of shrinkage rate must not be greater than the requirements of dimensional accuracy of plastic parts.
It should be noted that the difference of shrinkage rate of various resins is relatively small, and the analysis is based on the degree of crystallization of resins. Allgemein, the shrinkage of crystalline and semi crystalline resins is higher than that of non crystalline resins, so the range of shrinkage changes is small, and the shrinkage fluctuation of corresponding plastic parts after molding is also large; For the crystalline resin, the crystallinity is low, the molecular volume is reduced, and the shrinkage of the plastic part is small. The size of the resin spherulite also has an effect on the shrinkage rate. The spherulite is large, the gap of the molecular building is large, and the shrinkage ratio of the plastic part is large, so the impact strength of the plastic part is low.
2. Injection mold failure
The structural design and manufacturing accuracy of the mold indirectly affect the dimensional accuracy of the plastic part. In the molding process, if the rigidity of the mold is lacking or the molding pressure in the mold cavity is very low, the mold will deform, which will cause the plastic part forming size to be unstable.
If the fit clearance between the guide pillar and the guide sleeve block of the mould is out of tolerance due to less manufacturing accuracy or excessive wear and tear, the forming dimensional accuracy of the plastic part will also be reduced.
The first mock exam is that if the rigid filler or glass fiber reinforced material is used to form the raw material, the cavity will be slightly worn, or if the cavity is formed by one mold, the error between the cavity and the gate, the flow path and the improper balance of the feeding port will result in the filling process.
3. Injection molding equipment failure
If the plasticizing capacity of molding equipment is not enough, the feeding system is not stable, the screw speed is not stable, the stop function is abnormal, the check valve of hydraulic system is out of order, the thermocouple of temperature control system is burnt out, and the heater is open circuit, usw., the molding size of plastic parts will not be stable. If these faults are found out, targeted measures can be taken to eliminate them, including the failure of injection mold.
Im Spritzgussverfahren, any small problem will affect the quality of injection molding products, and even directly affect the size change.
Über JasonMould Industrial Company Limited
Jasonmould ist ein China Formenbauer von Kunststoffformen- Spritzgussform, Druckgussformen, Kunststoffblasformen plastic, Rotationsformen, medizinisch Kunststoff-Spritzguss, zwei Schuss Kunststoff-Spritzguss, Umspritzen, Umspritzen, Metallspritzguss, Mikrospritzguss, Pulverspritzguss, Keramikspritzguss, Flüssigspritzguss, Husky-Spritzguss, Haushaltsform, Gießform, Formwerkzeug, benutzerdefinierte Formen mold, Porzellanformen, Rapid-Prototyping-Werkzeuge, Kunststoff-Prototyping-Werkzeuge, Stanzpresswerkzeuge, Matrize und Werkzeuge für Handy-/Handyteile, Autoteile, Staubsauger, wiederaufladbare Werkzeuge, Telefone, Kopierer, Computers, Multimedia-Lautsprecher, und viele andere elektronische Produkte und Haushaltsgeräte. Und auch ein Hersteller von Kunststoffprodukten, Formenhersteller China- Kunststoffteile, Wassertank aus Kunststoff, Plastikkugeln, Kunststoffbehälter, Plastikschnalle, Kunststoffanker, Kleiderbügel aus Kunststoff, Plastiklöffel, Rohrverschraubung aus Kunststoff, Plastiktrommel, Plastikgeschirr plastic, Plastiktassen, Plastikflaschen, Plastikschale, Kosmetikbehälter aus Kunststoff, Plastikbehälter, Lebensmittelbehälter aus Plastik, Plastikstühle, Plastikkappen, Verschluss aus Kunststoff, Kunststoffrohre, Wasserrohre aus Kunststoff, Kunststoffknöpfe, Kunststoffschlauch, Gebrauchskartons aus Kunststoff, Plastikregale und so weiter.
Kontakt:
Person: James Yuan
Unternehmen: JasonMould Industrial Company Limited
Hinzufügen: LongGang-Dorf,LongXi-Stadt,Bezirk BoLuo,Stadt HuiZhou,Provinz Guangdong, China
Tel: 86-752-6682869
Email: [email protected]
Seite? ˅: https://www.jasonmolding.com/custom-injection-molding/
