Mold Surface Treatment Technology

Die die heat treatment is to ensure that the performance of an important process. It follows the mold have a direct impact on performance.
       
    Precision mold manufacturing: organizational change in uneven, incomplete and heat treatment the formation of the residual stress caused by excessive die after heat treatment processing, assembly and mold used in the process of deformation, thus reducing the precision of mold, or even scrapped.
       
    Die strength: development of improper heat treatment process, heat treatment operations are not standardized, or heat treatment equipment status is not good, resulting in processed mold strength (hardness) amounted to less than the design requirements.
       
    Mold of his working life: heat caused by the organizational structure is irrational, excessive grain size, etc., resulting in major properties such as die toughness, fatigue properties of hot and cold, anti-wear performance, and so on down and adversely affect the working life of die.
       
    Mold manufacturing costs: as a die in the middle part of the manufacturing process or final process, heat treatment caused by cracking, distortion-tolerance and performance of ultra-poor, in most cases will die scrap, even if the repair can continue to use, will increase the working hours to extend the delivery time, improve mold manufacturing costs.
       
    It is the quality of heat treatment technology and die a very close correlation, making it two kinds of technology in the modernization process, the mutual promotion and common progress. Since the 20th century, 80 years, the international mold heat treatment technology, a fast-growing area of vacuum heat treatment technology, the mold surface strengthening technology and pre-hardened mold material technology.
       
    Mold Vacuum Heat Treatment Technology
       
    Vacuum heat treatment technology is developed in recent years a new type of heat treatment technology, it has the characteristics, it is urgently needed in mold manufacturing, such as to prevent oxidation and not decarbonization heat, vacuum degassing or outgassing, eliminating hydrogen embrittlement, thereby enhancing material (parts) of the plasticity, toughness and fatigue strength. Vacuum heating is slow, spare parts a smaller temperature difference between inside and outside factors such as the decision of the vacuum heat treatment process caused by deformation of parts and small.
       
    By using the cooling medium is different from the vacuum quenching can be divided into the cold vacuum oil quenching, vacuum air-cooled quenching, vacuum water-cooled quenching and vacuum nitrate austempering. Mold vacuum heat treatment is the main application of the vacuum oil-cooling quenching, vacuum-cooled quenching and vacuum annealing. In order to maintain the workpiece (eg, mold) of the superior characteristics of vacuum heating, cooling agent and the cooling process of selection and development is very important, die quenching process is mainly used oil-cooling and air-cooled.
       
    For the heat treatment carried out after the machining of the mold is no longer face, quenching the extent possible, after the vacuum annealing, in particular the vacuum quenching of the workpiece (mold), which can improve the mechanical and surface quality-related properties, such as fatigue properties, surface brightness, The corrosive and so on.
       
    Computer simulation of heat treatment process technology (including the organization of simulation and performance prediction technologies) successful development and application of intelligent heat treatment makes it possible to die. As the mold of small quantities (or even a single piece), multiple varieties of features, and performance requirements for heat treatment of high and does not allow for the characteristics of waste, but also makes intelligent mold heat treatment is a must. Die intelligent heat treatment include: a clear mold structure, timber, heat treatment and performance requirements of mold heating process the temperature field, stress field distribution in a computer simulation of mold cooling process the temperature field, phase-change process and computer simulation of stress field distribution in heating and cooling processes Simulation of Quenching Process for heat treatment equipment to develop the automation control technology. Western industrial countries, such as the United States, Japan, in a vacuum high pressure gas quenching, it has already carried out research and development in this area, the main target is also a mold.

International Mold Network

  Mold Surface Treatment Technology

International Mold Network


    Mold in the work required in addition to the matrix with a sufficiently high strength and toughness of the reasonable co-ordination, the surface performance of the work performance and service life of dies is essential. These surface properties refer to: wear resistance, corrosion resistance, friction coefficient, fatigue properties. These performance improvements, relying solely on substrate material to improve and enhance it is very limited, it is not economic, but through the surface treatment technology, can often have a multiplier effect, this is precisely the rapid development of surface treatment technology reasons.
       
    Die surface treatment technology, through surface coating, surface modification or composite processing technology to change the mold surface morphology, chemical composition, organizational structure and stress state in order to obtain the required surface properties of systems engineering. The way from the surface treatment, can be divided into: chemical methods, physical methods, physical chemical and mechanical methods. Although aimed at improving the mold surface properties of the new processing technology continues to emerge, but more in the mold manufacturing is mainly applied nitriding, carburizing, and hardening of film deposition.
       
    Nitriding process of gas nitriding, ion nitriding, liquid nitriding, etc., each nitriding method, there are several kinds of nitriding technology can adapt to different kinds of steel workpiece requirements. As the nitriding technology can be developed into a fine performance of the surface, and the nitriding process and die steel quenching processes are well coordinated, while low temperature nitriding, nitriding without heated after cooling, a very small deformation of the mold, so mold nitriding surface hardening technology is used earlier, but also the most widely used.

International Mold Network


       
    Die carburizing main purpose is to improve the overall strength and toughness of the mold, that mold working surface with high strength and abrasion resistance, thus the introduction of the technical idea is to use lower-grade materials, namely, by carburizing quenching to instead of higher-level material, thus reducing manufacturing costs.
       
    Hardened film deposition technology is currently more mature is the CVD, PVD. In order to increase the bonding strength of the workpiece surface film, and now developed a variety of enhanced CVD, PVD techniques. Hardened film deposition technology, the earliest tools (knives, cutting tools, measuring tools, etc.) applications, with excellent results, a variety of knives have been hardened coating film as a standard process. Mold 80 years since the last century began to use hardened coating film technology. The current technological conditions, the hardened film deposition technologies (mainly equipment) costs are higher, still only in a number of sophisticated, long-life die on the application, if we adopt the way of the establishment of heat-treatment center, then coated with hardened film would greatly reduce the cost of more die if we adopt this technology, you can mold the overall improvement of China's manufacturing standards.

International Mold Network

   The pre-hardened mold material technology
       
    Die in the manufacturing process of heat treatment is the vast majority of mold followed a lengthy process, since the 70s last century began, the international community put forward the idea of pre-hardened, but because of machine tool and cutting tool rigidity constraints, pre-hardened unable to meet the hardness of the use of mold hardness, so the pre-hardening technology, R & D investment is not. As the machine tool and cutting tools enhance the performance of the pre-hardened mold material accelerated technology development, to the last century 80's, the international timber industry developed countries in the plastic mold using the ratio of pre-hardened module has reached 30% (currently 60% above). China in the mid to late 90s of the last century began to use the pre-hardening module (mainly with imported products).
       
    The pre-hardened mold material is mainly used in mold material manufacturers developed and implemented. By adjusting the chemical composition of steel and equipped with the appropriate heat treatment equipment, stable quality can be mass-produced pre-hardening of the module. China in the pre-hardened mold material technology, started late, small-scale, we can not meet the domestic mold manufacturing requirements.
   
    Use of pre-hardened mold material, mold manufacturing process can simplify and shorten the manufacturing cycle of molds, improve the manufacture of precision molds. It can be predicted, with the advances in processing technology, pre-hardened mold material will be used for more types of mold. Die die heat treatment is to ensure that the performance of an important process. It follows the mold have a direct impact on performance.
       
    Precision mold manufacturing: organizational change in uneven, incomplete and heat treatment to form the residual stress caused by excessive die after heat treatment processing, assembly and mold used in the process of deformation, thus reducing the precision of mold, or even scrapped.
       
    Die strength: development of improper heat treatment process, heat treatment operations are not standardized, or heat treatment equipment status is not good, resulting in processed mold strength (hardness) amounted to less than the design requirements.
       
    Mold of his working life: heat caused by the organizational structure is irrational, excessive grain size and so on, leading to the resilience of the major properties such as mold, hot and cold fatigue performance, wear resistance and so on down and adversely affect the working life of die.
       
    Mold manufacturing costs: as a die in the middle part of the manufacturing process or final process, heat treatment caused by cracking, distortion-tolerance and performance of ultra-poor, in most cases will die scrap, even if the patch may continue to use, will increase the working hours to extend the delivery time, improve mold manufacturing costs.
       
    It is the quality of heat treatment technology and die a very close correlation, making it two kinds of technology in the modernization process, the mutual promotion and common progress. Since the 20th century, 80 years, the international mold heat treatment technology, a fast-growing area of vacuum heat treatment technology, the mold surface strengthening technology and pre-hardened mold material technology.