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Die-casting Mold Is A Major Category In The Mold
Jun 22, 2017

  Die-casting mold is a major category in the mold. With the rapid development of China's automobile and motorcycle industry, die-casting industry ushered in the development of a new era, but also on the die-casting mold comprehensive mechanical properties, life and so put forward higher requirements. To meet the ever-increasing use of performance requirements rely solely on the application of new mold materials is still difficult to meet, must be a variety of surface treatment technology applied to the die-casting mold surface treatment in order to achieve the die-casting mold high efficiency, high precision and high life requirements The In a variety of molds, die-casting mold working conditions are more harsh. Pressure casting is to make the molten metal in the high-pressure, high-speed mold cavity filled with die-casting molding, repeated in the course of work with the hot metal contact, so the die-casting mold has a high thermal fatigue, thermal wear resistance, corrosion resistance , Impact toughness, red hardness, good mold release and so on. Therefore, the die-casting mold surface treatment technology requirements are higher.

  1, the traditional heat treatment process improvement technology

  The traditional die-casting mold heat treatment process is quenching - tempering, and later developed a surface treatment technology. As a variety of materials can be used as die-casting molds, the same surface treatment technology and process applications in different materials will have different effects. Based on the traditional process, the paper puts forward the suitable processing technology for different mold materials, so as to improve the mold performance and improve the die life of the mold base material and surface treatment technology. Heat treatment technology to improve another direction of development, is the traditional heat treatment process and advanced surface treatment process combined to improve the service life of die-casting mold. Such as the chemical heat treatment method carbonitriding, combined with conventional quenching and tempering process NQN (ie carbonitriding - quenching - carbonitriding composite strengthening, not only get a higher surface hardness, and effective hardening layer Depth increase, the hardness gradient of the infiltration layer is reasonable, the tempering stability and corrosion resistance are improved, so that the die casting mold has a good improvement in the surface quality and performance while obtaining good heart performance.

  2, surface modification technology

  Surface thermal expansion technology

  This type includes carburizing, nitriding, boronizing and carbonitriding, sulfur carbonitriding and so on.

  Carburizing and carbonitriding

  Carburizing process used in cold, hot and plastic mold surface strengthening, can improve the die life. Such as 3Cr2W8V steel die-casting mold, the first carburizing, and then by 1140 ~ 1150 ℃ quenching, 550 ℃ tempering twice, the surface hardness up to HRC56 ~ 61, the die-casting non-ferrous metals and alloys die life increased 1.8 to 3.0 times The Carburizing treatment, the main process methods are solid powder carburizing, gas carburizing, and vacuum carburizing, ion carburizing and carburizing atmosphere by adding nitrogen to form carbonitriding and so on. Among them, the vacuum carburization and ionization of carburizing is nearly 20 years to develop the technology, the technology has a fast penetration, infiltration layer uniformity, carbon gradient gradient and the workpiece deformation is small, will be in the mold surface, especially the precision mold Surface treatment plays an increasingly important role.

  Nitriding and related low temperature thermal expansion technology

  This type includes nitriding, ion nitriding, carbonitriding, nitriding, nitriding, and sulfur, nitrogen, and sulfuric acid. The method has the advantages of simple processability, strong adaptability, low penetration temperature is generally 480 ~ 600 ℃, the workpiece deformation is small, especially to adapt to the precision mold surface strengthening, and the nitride layer is high hardness, good wear resistance, Anti-tack performance.