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Surface Strengthening Process Of Die - Casting Mould
Jul 06, 2017

  Surface Strengthening Process of Die - casting mould

  Conventional overall quenching has been difficult to meet the high wear resistance of the die-casting mould and the matrix's toughness requirements.

  Surface strengthening treatment can not only improve the wear resistance of the die casting mould surface and other properties, but also to maintain sufficient strength and toughness of the matrix, while preventing the molten metal sticky mould, erosion, which improve the overall performance of die-casting mould, saving alloying elements, Significantly reduce costs, give full play to the potential of materials, and make better use of new materials, are very effective.

  Production practice shows that the surface strengthening treatment is to improve the quality of die-casting mould and extend the useful life of the mould. Die casting moulds often used in the surface treatment process are: carburizing, nitriding, nitrocarburizing, boronizing, chromizing and aluminizing.

  1. carburizing

  Carburizing is currently the most widely used chemical heat treatment method in the machinery industry. The process is characterized by: low-carbon low-alloy mould steel and high-carbon high-alloy steel mould in the carbon activated medium (carburizing agent), heated to 900 ℃ -930 ℃, Die - casting mould the carbon atoms into the mould surface Layer, followed by quenching and low temperature tempering, so that the mould surface and the heart has a different composition, organization and performance.

  Carburizing is divided into solid carburization, liquid carburization and gas carburization. The recent development of controlled atmosphere carburizing, vacuum carburizing and benzene ionization and so on.

  2. Nitriding

  The process of penetrating nitrogen into the steel surface is called nitriding of steel. Nitriding allows mould parts to achieve higher surface hardness, abrasion resistance, Die - casting mould fatigue properties, red hardness and corrosion resistance than carburizing. Because the nitriding temperature is low (500-570 ℃), after the nitriding mould parts deformation is small.

  Nitriding methods are solid nitriding, liquid nitriding and gas nitriding. At present, new technologies such as ion nitriding, vacuum nitriding, electrolytic urination and nitriding are widely used to shorten the nitriding time and obtain high quality nitriding layer.


  Nitrocarburizing is a low temperature nitrocarburizing process (530 ° C to 58 ° C) which permeates nitrogen and carbon in a medium containing activated carbon and nitrogen atoms. Die - casting mould The permeability of nitrocarburizing is small, and the time of nitriding is much shorter than that of nitriding. The die-casting mould can significantly improve its thermal fatigue performance after nitrocarburizing.

  Poor working conditions, requiring die-casting moulds with good high temperature mechanical properties, resistance to hot and cold fatigue properties, resistance to liquid metal erosion resistance, oxidation resistance and high hardenability and wear resistance, heat treatment is the main factor to determine these properties Manufacturing process.

  Die-casting mould heat treatment, is through the steel structure to change, so that the mould surface to obtain a high hardness and wear resistance, Die - casting mould and the heart still has sufficient strength and toughness, while effectively preventing the molten metal sticky mould, erosion. Choose the right heat treatment process, can reduce waste and significantly improve the mould life.