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How to Choose Injection Mould Processing Materials?

Meet the requirements of working conditions
  1. Wear resistance
    When the billet plastically degenerates in the cavity of injection mould, it flows and slides along the surface of cavity, causing violent friction between the surface of the cavity and the blank, resulting in failure of injection mould due to wear. Therefore, the wear resistance of the material is one of the most basic and important properties of injection mould. Hardness is the main factor affecting wear resistance. Generally, the higher the hardness of injection mould parts, the smaller the amount of wear and the better the wear resistance. In addition, wear resistance is also related to the type, number, morphology, size, and distribution of carbides in the material.

  2. Toughness
    Most of the working conditions of injection mould are very harsh, and some often suffer from a large impact load, resulting in brittle fracture. In order to prevent the mould parts from suddenly breaking during work, Injection mould must have high strength and toughness. The toughness of injection mould depends mainly on the carbon content, grain size, and microstructure of the material.

  3. Fatigue fracture performance
    During the working process of injection mould, under the long-term effect of cyclic stress, fatigue fracture often occurs. In the form of small energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture. The fatigue fracture properties of injection mould depend primarily on its strength, toughness, hardness, and inclusion content in the material.

  4. High temperature performance
    When the working temperature of injection mould is higher, the hardness and strength will be reduced, resulting in early wear of injection mould or plastic deformation and failure. Therefore, the mould material should have high anti-tempering stability to ensure that the mould has higher hardness and strength at working temperature.

  5. Cold and heat fatigue resistance
    Some injection moulds are in a state of repeated heating and cooling during the working process, which causes the stress on the surface of the cavity to be pulled and the stress changes, causing cracking and flaking of the surface, increasing the frictional force, impeding the plastic deformation, and reducing the dimensional accuracy, thereby resulting in mould failure. Hot and cold fatigue is one of the main forms of failure of hot work moulds, and these types of moulds should have high resistance to hot and cold fatigue.

  6. Corrosion resistance
    Some moulds such as plastic moulds work, due to the presence of elements such as chlorine and fluorine etc in the plastic, after heating, decompose and precipitate the aggressive such as HCI, HF and so on, and then erosion the injection mould cavity surface, which increase its surface roughness, and increase wear and failure.
To meet the process performance requirements
The manufacture of injection moulds generally has to undergo several processes such as forging, cutting, and heat treatment etc. In order to ensure the quality of injection moulds and reduce production costs, the materials should have good forgeability, machinability, hardenability, and grindability, it should also have small oxidation, decarburization sensitivity, and quenching deformation cracking tendency.
Plastic Injection Mould Factory
  1. Forgeability
    It has low hot forging deformation resistance, good plasticity, wide forging temperature range, cold cracking during forging and low tendency to precipitate reticular carbide.

  2. Annealing processability
    The spheroidizing annealing temperature range is wide, the annealing hardness is low, the fluctuation range is small, and the spheroidization rate is high.

  3. Machinability
    Large amount of cutting, low tool loss, low surface roughness.

  4. Oxidation, decarbonization sensitivity
    Antioxidation is good when high temperature heating, decarburization is slow, and it is not sensitive to the heating medium, resulting in a small pitting tendency.

  5. Hardenability
    Quenched with a uniform and high surface hardness.

  6. Hardenability
    After quenching, a deeper hardened layer can be obtained, which can be quenched with a mild quenching medium.

  7. Quenching deformation cracking tendency
    The conventional quenching volume changes little, the shape is warped, the distortion is slight, and the abnormal deformation tends to be low. Conventional quench cracking susceptibility is low and insensitive to quenching temperature and workpiece shape.

  8. Grindability
    The relative loss of the grinding wheel is small, there is no grinding limit for the large amount of grinding, and it is insensitive to the quality of the grinding wheel and cooling conditions, and it is not easy to cause grinding and grinding cracks.

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