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Mold Surface Treatment Technology

Update Time:2011-05-27   Writer:arima

Mold heat treatment is to ensure that the important properties of the mold process. It follows the mold have a direct impact on performance.
Precision mold manufacturing: organizational change uniform, and heat treatment is not completely formed residual stress caused by the mold processing after heat treatment, assembly and mold deformation during use, thereby reducing the accuracy of the mold, or even scrapped.
Die strength: the development improper heat treatment, heat treatment or heat treatment equipment is not standardized operation status is not good, resulting in mold strength is processed (hardness) less than the design requirements.
Mould's work life: organizational structure caused by heat treatment is unreasonable, excessive grain size, leading to major properties such as die toughness, thermal fatigue performance, wear resistance and so decrease the working life of the mold.
Mold manufacturing costs: as the middle part of the mold manufacturing process or final process, heat treatment caused the 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 the mold has a very close relationship, making it two in the process of modernization and promote each other and improve together. 80 years since the 20th century, the international mold heat treatment technology development area of ​​rapid 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 of mold manufacturing is urgently needed, such as to prevent oxidation and non-heat removal, vacuum degassing or outgassing, eliminating hydrogen embrittlement, thereby enhancing the material (parts) of the plasticity, toughness and fatigue strength. Vacuum heating is slow, small parts inside and outside temperature and other factors, determine the cause of vacuum heat treatment and small deformation of parts.
By using different cooling media, vacuum quenching can be divided into the cold vacuum oil quenching, vacuum-cooled quenching, water quenching and vacuum vacuum austempering nitrate. The main application of vacuum heat treatment mold is vacuum oil quenching, vacuum-cooled quenching and vacuum annealing. In order to maintain the workpiece (such as mold) the good characteristics of vacuum heating, cooling agent and the selection and development of the cooling process is very important, die quenching process is mainly by oil cooling and air cooling.
Not conducted after the heat treatment of the mold face machining, vacuum annealing after quenching as far as possible, in particular, vacuum hardening of the workpiece (mold), which can improve the surface quality associated with the mechanical properties, such as fatigue, surface brightness, and corrosive.