La selección de los materiales del molde es un tema importante en el diseño y la fabricación de moldes., que afecta directamente al proceso de fabricación del molde, la vida útil del molde, la calidad de moldeo de las piezas de plástico y el costo de procesamiento del molde.
Debido a esto, la calidad de moldeo de las piezas de plástico y el costo de procesamiento del molde, la calidad de moldeo de las piezas de plástico y el costo de procesamiento del molde, la calidad de moldeo de las piezas de plástico y el costo de procesamiento del molde, la calidad de moldeo de las piezas de plástico y el costo de procesamiento del molde.
Además, 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.
La resistencia al desgaste del molde depende de la composición química del acero y de la dureza del tratamiento térmico., so increasing the hardness of the mold is beneficial to improve its wear resistance.
(2) Buena maquinabilidad
Use steel grades that are easy to cut and that provide high-precision parts after machining.
Por esta razón, 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.
Por lo tanto, 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.
Por esta razón, 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) Buena estabilidad térmica
The shape of the parts of the plastic injection mold is often complicated, y es difícil de procesar después del enfriamiento. Por lo tanto, 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, la deformación del tratamiento térmico es pequeña, and the dimensional change caused by the temperature difference
The rate is small, La estructura metalográfica y el tamaño del molde son estables., 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) Resistencia a la corrosión
For some plastic types, such as polyvinyl chloride and flame retardant plastics, steel grades with corrosion resistance must be considered.
Además, al seleccionar los materiales, 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.
Acerca de JasonMould Industrial Company Limited
Jasonmould es un Fabricante de moldes de China de moldes de plástico- molde de inyección, moldes de fundición a presión, moldeo por soplado de plástico, moldeo rotacional, médico moldeo por inyección de plástico, dos disparos moldeo por inyección de plástico, moldeado de inserción, sobremoldeo, moldeo por inyección de metal, micro moldeo por inyección, moldeo por inyección de polvo, moldeo por inyección de cerámica, moldeo por inyección de líquido, moldeo por inyección husky, molde del hogar, molde de fundición, morir herramienta de molde, moldes personalizados, moldes de porcelana, herramientas de creación rápida de prototipos, herramientas de creación de prototipos de plástico, herramientas de punzonadora, matriz y herramientas para piezas de teléfonos móviles / celulares, piezas de automóviles, aspiradoras, herramientas recargables, telefonos, fotocopiadoras, ordenadores, altavoces multimedia, y muchos otros productos electrónicos y electrodomésticos.. Y también un fabricante de productos de plástico., fabricante de moldes China- Partes plásticas, tanque de agua de plástico, bolas de plastico, contenedores de plástico, hebilla de plastico, ancla de plastico, percha de plastico, cuchara de plástico, accesorio de tubería de plástico, caída de plástico, vajilla de plastico, copas de plástico, botellas de plástico, bandeja de plástico, envase cosmético de plástico, Contendor de plastico, recipiente de plástico para alimentos, sillas de plastico, Tapas de plástico, cierre de tapa de plástico, tubos de plastico, tuberías de agua de plástico, perillas de plástico, tubo de plastico, cajas de plástico para uso general, rejillas de plástico, etc..
Contacto:
Persona: James Yuan
Empresa: JasonMould Industrial Company Limited
Agregar: Pueblo LongGang,Ciudad de LongXi,Condado de BoLuo,Ciudad de HuiZhou,La provincia de Guangdong, porcelana
Tel: 86-752-6682869
Correo electrónico: [email protected]
