Injection Molding Part
Injection molding part details injection molding part Photo Plastic mold working conditions and different from the cold die, generally have to work at 150 ° C-200 ° C, in addition to being subject to certain pressure, but also to withstand the impact of temperature. Now based on plastic molding...Send Inquiry
Injection molding part details
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injection molding part Photo
Plastic mold working conditions and different from the cold die, generally have to work at 150 ° C-200 ° C, in addition to being subject to certain pressure, but also to withstand the impact of temperature. Now based on plastic molding mold conditions of use, different processing methods will be the basic performance of plastic mold steel requirements are summarized as follows:
1, enough surface hardness and wear resistance
Plastic mold hardness is usually below 50-60HRC, after heat treatment of the mold should have sufficient surface hardness, to ensure that the mold has sufficient rigidity. Die in the work due to the filling and flow of plastic to withstand greater compressive stress and friction, requiring the mold to maintain the accuracy of shape and dimensional accuracy of the stability, to ensure adequate mold life. Mold wear resistance depends on the chemical composition of steel and heat treatment hardness, thus increasing the hardness of the mold is conducive to improving its wear resistance.
2, excellent machinability
Most plastic mold, in addition to EMD processing also need to carry out a certain cutting and fitter repair. To extend the life of cutting tools, improve cutting performance, reduce surface roughness, plastic mold steel hardness must be appropriate.
3, good polishing performance
High-quality plastic products, the surface roughness of the cavity requires a small value. For example, the surface roughness of the injection mold cavity is less than the Ra0.1 ~ 0.25 level, the optical surface is required Ra <0.01nm, the cavity must be polished to reduce the surface roughness value. For this reason, the steel material used requires less material impurities, uniform microstructure, no fiber orientation, polishing should not appear pitting or orange peel defects.
4, good thermal stability
Plastic injection mold parts are often more complex shape, difficult to quench after processing, it should try to use has good thermal stability, when the mold after heat treatment due to the small linear expansion coefficient, small heat distortion, temperature changes caused by dimensional changes Small rate, the microstructure and die size stability, can reduce or no longer process, you can ensure that the die size accuracy and surface roughness requirements.
45,50 grade carbon steel with a certain degree of strength and wear resistance, after quenching and tempering more for the mold material. High-carbon tool steel, low alloy tool steel after heat treatment with high strength and wear resistance, used for molding parts. However, high-carbon tool steel deformation due to heat treatment, only for the manufacture of small size, simple shape of the molding parts.
With the development of the plastics industry, the requirements for the complexity and precision of plastic products are getting higher and higher, and the mold materials are also put forward higher requirements. Pre-hardened steels (such as PMS), corrosion-resistant steels (such as PCR) and low-carbon maraging steels (such as 18Ni-250) can be used for making complex, precise and corrosion- Cutting, heat treatment and polishing performance and high strength.
In addition, the choice of materials must also be considered to prevent scratches and gluing, such as the two surfaces there is relative motion, then try to avoid the choice of materials with the same organizational structure, special circumstances can be one side plating or nitriding, so that the two sides have different Surface structure.