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Mold heat treatment is important to ensure the process of mold properties. It has a direct bearing on the performance of mould are as follows. Die manufacturing precision: residual microstructure transformation is not uniform, not thorough and heat treatment to form the stress caused by excessive mold after heat treatment processing, assembly and tooling used in the deformation process, thereby reducing the mold precision, even scrapped. Die strength: heat treatment process is not appropriate, do not regulate the operation of heat treatment or heat treatment equipment status is not complete, cause mould strength (hardness) processing does not reach the design requirements. Die working life: organizational structure caused by heat treatment is not reasonable, grain size exceed the standard, leading to the main properties such as toughness of the mold, cold hot fatigue performance, wear resistance decreased, the influence of die service life.
The manufacturing cost of mold: intermediate links as mold manufacturing process or the final process, deformation and cracking caused by heat treatment, the ultra poor and ultra poor performance, in most cases will make the mold scrapped, even through the repair can continue to use, will also increase the working hours, extend the time of delivery, improve the manufacturing cost of the mould. There is close relation to heat treatment technology and quality of die, make these two kinds of technology to promote each other in the process of modernization, improve together. In recent years, the international mold heat treatment technology of rapid development is the field of vacuum heat treatment technology, the mold surface strengthening pre hardening technology and the die materials.
Vacuum heat treatment technology, mold
Vacuum heat treatment technology is a new type of heat treatment technology developed in recent years, it has the characteristics, it is the urgent need of mold manufacturing, such as preventing oxidation and decarbonization of vacuum degassing or not, in addition to gas, hydrogen embrittlement relief, so as to improve the material (parts) of the plasticity, toughness and fatigue strength. Vacuum slow heating, temperature difference between inside and outside the small parts and other factors, determines the vacuum heat treatment process caused by deformation and small parts etc.. According to the cooling medium used by different, vacuum quenching can be divided into the vacuum oil quenching, vacuum gas quenching, vacuum cooling quenching and vacuum nitrate isothermal quenching. Mould vacuum heat treatment mainly is the application of vacuum oil quenching, vacuum gas quenching and vacuum tempering. In order to maintain the workpiece (such as mold) the excellent characteristics of vacuum heating, coolant and cooling process selection and development is very important, die quenching process mainly uses oil cooling and air cooling.
Heat treatment for no machining the mold surface, as far as possible using vacuum tempering after quenching, especially workpiece vacuum quenching (die), it can improve the mechanical performance was related with the surface quality. Such as fatigue performance, surface brightness, corrosion resistance etc.. Heat treatment process of computer simulation technology (including microstructure simulation and performance prediction of the successful development and application of Technology), so that the mould intelligent heat treatment is possible. Due to the small batch production mold (or even single), the characteristics of multi varieties, as well as the heat treatment of high performance requirements and does not allow the emergence of waste characteristics, but also makes the intelligent processing mould must be. Includes intelligent heat treatment of Die & mould structure: requirements, timber, heat treatment properties: clear die mould heating process of temperature field, stress field distribution of computer simulation; mould temperature field during cooling process, phase transformation and stress field distribution simulation computer simulation; heating and cooling process of quenching process; formulation; heat treatment equipment automation control technology. Foreign industrial countries, such as USA, Japan, in the high pressure gas quenching vacuum, has been carried out for the development of these technologies, the main target is the mold.