Die Auswahl der Formmaterialien ist ein wichtiges Thema bei der Formenkonstruktion und -herstellung, was sich direkt auf den Herstellungsprozess der Form auswirkt, die Lebensdauer der Form, die Formqualität der Kunststoffteile und die Verarbeitungskosten der Form.
Deswegen, In- und ausländische Wissenschaftler haben neue Formenstähle mit guter Leistung entwickelt, Verarbeitungsleistung und Wärmebehandlungsverformung, wie vorgehärteter Stahl, neuer Vergütungsstahl und Maraging-Stahl.
In Ergänzung, in order to improve the lifetime of the mold, many research and engineering practices have been done on the surface strengthening treatment of the molded parts, and good results have been achieved.
So far, the above research and development work has been continuously carried out in depth, and the results achieved have been vigorously promoted.
The working conditions of plastic molds generally have to work at 150~200 °C, in addition to the pressure, there is also the effect of temperature.
According to the different conditions and processing methods of plastic molding dies, the basic performance requirements of steel for plastic molds are roughly summarized as follows:
(1) Sufficient surface hardness and wear resistance
The hardness of the plastic mold is usually below 50~60 HRC, and the heat-treated mold should have sufficient surface hardness to ensure the mold has sufficient rigidity.
In the work, the mold is subjected to large compressive stress and friction due to the filling and flowing of the plastic. The mold is required to maintain the accuracy of the shape and the stability of the dimensional accuracy to ensure the mold has a sufficient service life.
Die Verschleißfestigkeit der Form hängt von der chemischen Zusammensetzung des Stahls und der Härte der Wärmebehandlung ab, so increasing the hardness of the mold is beneficial to improve its wear resistance.
(2) Gute Bearbeitbarkeit
Use steel grades that are easy to cut and that provide high-precision parts after machining.
Deshalb, medium carbon steel and medium carbon alloy steel are most commonly used, which is especially important for large molds.
For parts requiring EDM, the burn hardened layer of the steel is also required to be thin.
(3) Excellent polishing performance
High-quality plastic products require a small roughness value on the surface of the cavity.
Deshalb, the working surface of the injection molded part needs to be polished to the mirror surface, Ra≤0.05μm, the hardness of the steel is required to be 35~40 HRC, and the surface is too hard, which makes the polishing difficult.
Deshalb, the selected steel requires less material impurities, the microstructure should be uniform and dense, and there is no fiber directionality. There should be no pitting or orange peel defects during polishing.
(4) Gute thermische Stabilität
The shape of the parts of the plastic injection mold is often complicated, und es ist nach dem Abschrecken schwierig zu verarbeiten. Deshalb, materials with good thermal stability should be selected as much as possible, so that the linear expansion coefficient of the molded parts after heat treatment is small, Die Verformung durch die Wärmebehandlung ist gering, and the dimensional change caused by the temperature difference
The rate is small, Die metallografische Struktur und die Formgröße sind stabil, which can be reduced or no longer processed, thus ensuring the dimensional accuracy and surface roughness requirements of the mold.
(5) Good wear resistance and fatigue resistance
The injection molded cavity is not only washed by the high pressure plastic melt, but also by the temperature stress of the alternating heat and cold.
The general high carbon alloy steel can be heat treated to obtain high hardness, but the toughness is poor, and it is easy to form surface cracks, which is not suitable.
The selected steel grade should enable the injection mold to reduce the number of times of polishing and repair, and maintain the dimensional accuracy of the cavity for a long time, achieving the service life of mass production.
(6) Corrosion resistance
For some plastic types, such as polyvinyl chloride and flame retardant plastics, steel grades with corrosion resistance must be considered.
In Ergänzung, bei der Materialauswahl, it is necessary to consider preventing scratches and gluing. If there is relative motion between the two surfaces, try to avoid selecting materials with the same structure. In special cases, one side may be plated or nitride to make the two sides different surface structure.
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/company/
