Keywords: heat treatment, industrial electric furnace, electric furnace, industrial furnace, cooling media, vacuum, heating, quenching,

heat treatment technology for industrial electric furnace mold

　　vacuum heat treatment technology for 1. industrial electric furnace mold

　　vacuum heat treatment technology is a new type of heat treatment technology developed in recent years. it has its characteristics, it is urgently needed in mold manufacturing, such as preventing oxidation and decarburization, vacuum degassing or degassing, eliminating hydrogen embrittlement, thereby improving the plasticity, toughness and fatigue strength of materials (parts). Factors such as slow vacuum heating and small temperature difference between inside and outside of the part determine the small deformation of the part caused by the vacuum heat treatment process.

　　According to the different cooling media used, vacuum quenching can be divided into vacuum oil quenching, vacuum gas quenching, vacuum water quenching and vacuum nitrate isothermal quenching. The main application of vacuum heat treatment is vacuum oil quenching, vacuum gas quenching and vacuum tempering. In order to maintain the excellent characteristics of vacuum heating of workpieces (such as molds), the selection and formulation of coolant and cooling processes are very important. The mold quenching process mainly uses oil cooling and air cooling.

　　For the mold working surface that is no longer machined after heat treatment, vacuum tempering is used as much as possible after quenching, especially the workpiece (mold) of vacuum quenching, which can improve the mechanical properties related to surface quality. Such as fatigue performance, surface brightness, corrosion, etc.

　　The successful development and application of computer simulation technology (including tissue simulation and performance prediction technology) of heat treatment process makes it possible to intelligently heat treatment of molds. Due to the small batch (even single piece), multi-species characteristics of mold production, as well as the high requirements for heat treatment performance and the characteristics of not allowing waste, it also makes the intelligent processing of molds necessary. The intelligent heat treatment of the mold includes: clear mold structure, material, heat treatment performance requirements: mold heating process temperature field, stress field distribution of computer simulation; mold cooling process temperature field, phase change process and stress field distribution of computer simulation; heating and cooling process simulation; quenching process formulation; heat treatment equipment automation control technology. Foreign industrial developed countries,

　　such as the United States, Japan, etc., in the vacuum high-pressure gas quenching, has carried out technology research and development in this area, mainly for the target is also mold.

　　Surface treatment technology for 2. industrial electric furnace molds

　　In addition to the reasonable coordination of the matrix with sufficient strength and toughness, the surface performance of the mold is very important to the working performance and service life of the mold. These surface properties refer to: wear resistance, corrosion resistance, friction coefficient, fatigue performance, etc. The improvement of these properties, relying solely on the improvement and improvement of the substrate material is very limited, and it is not economical, and through surface treatment technology, often can get twice the result with half the effort, which is the reason for the rapid development of surface treatment technology.

　　The surface treatment technology of the mold is a systematic engineering that changes the shape, chemical composition, organizational structure and stress state of the mold surface through surface coating, surface modification or composite treatment technology to obtain the required surface properties. From the way of surface treatment, it can be divided into: chemical methods, physical methods, physical and chemical methods and mechanical methods. Although new treatment technologies aimed at improving the surface properties of molds are constantly emerging, the main nitriding, carburizing and hardened film deposition are more widely used in mold manufacturing.

　　Nitriding process (carburizing furnace) has gas nitriding, ion nitriding, liquid nitriding and other methods. In every 1 kinds of nitriding methods, there are several kinds of nitriding technology, which can adapt to the requirements of different steel types and different workpieces. Because the nitriding technology can form a surface with excellent performance, and the nitriding process has a good coordination with the quenching process of die steel. At the same time, the nitriding temperature is low, and the deformation of the mold is extremely small. Therefore, the surface strengthening of the mold is earlier and the most widely used nitriding technology.

　　The purpose of mold carburizing is mainly to improve the overall strength and toughness of the mold, that is, the working surface of the mold has high strength and wear resistance. The technical idea introduced by this is to use lower-grade materials, that is, to replace higher-grade materials by carburizing and quenching, thereby reducing manufacturing costs.

　　hardened film deposition technology is currently more mature CVD, PVD. In order to increase the bonding strength of the surface of the film workpiece, a variety of enhanced CVD, 'PVI) technologies have been developed. Hardened film deposition technology was first applied on tools (cutting tools, cutting tools, measuring tools, etc.) with excellent results. A variety of cutting tools have been coated with hardened film as a standard process. The mold has been coated with hardened film technology since the 1980 s. Under the current technical conditions, the cost of hardened film deposition technology (mainly equipment) is relatively high, and it is still only used in some precision and long-life molds. If the method of establishing a heat treatment center is adopted, the cost of coating hardened film will be greatly reduced. If more molds adopt this 1 technology, the overall level of mold manufacturing in our country can be improved.

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