Keywords: control, cooling, quenching parts, quenching cooling, medium flow rate, medium temperature, computer, controllable, ImmersionTimeQuenchingSystem， Mixing speed, quenching,

Controlled cooling technology
　　Controlled cooling technology refers to the technology that obtains the required organization and performance by controlling the relevant factors through the study of the quenching cooling conditions (such as medium flow rate, medium temperature, etc.) of the quenching parts. With the development of computer technology and the close combination of control technology and computer, the quenching and cooling process is developing in a controllable direction.

　　S.W.Han et al. proposed the controlled immersion quenching system ITQS(ImmersionTimeQuenchingSystem). The core of the system is to increase the intensity of pantyfire at the beginning of quenching by controlling the speed and direction of stirring to obtain high hardness. When the temperature of the workpiece reaches the Ms point area, the intensity of pantyfire is reduced to reduce the distortion and cracking tendency of the workpiece. The results show that the system is effective in reducing the distortion of the workpiece. The key to the success of the ITQS system is to accurately determine the cooling time of the initial cooling stage (ARI) by calculating or experimentally measuring the H factor (equivalent to the quenching intensity) required to obtain a certain hardened layer, and then looking up the corresponding table to determine the time required for ARI. The difference between ITQS system and the traditional real-time quenching method is that the time sequence of the former changing the stirring speed is calculated by theory, verified by experiments, and then controlled by computer to reproduce it in production practice; while the latter uses trial and error The method, its success is determined by the operator, and its reproducibility is poor.

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