The Numerical Simulation Of High Speed Steel Tap Cryogenic Treatment Process And Parameters Optimization

The mechanical properties and life of high-speed steel workpiece can beimproved by cryogenic treatement. It has been given a lot of attention in the areaof cryogenic treatment but it is relevant late to focus on it at home, especially thesimulation of the treatment process. It is difficult for the treatment to spreadwidely because the process is not imperfect and the consumption of the liquidnitrogen is huge.High speed steel tap and adjustable liquid nitrogen cryogenic tank are theobjects of the research. The cost of cryogenic treatment is reduced and effectionof cryogenic treatment is improved by increasing the uniformity of the flow fieldof cryogenic tank, reducing the temperature difference between the tap andconsumption of liquid nitrogen. The model of tap is completed with Pro/E andsimulation of treatment are with the help of the theory of fluid mechanics andheat transfer, and the powerful heat transfer simulate function of FLUENT. thetap material is W9Mo3Cr4V, and the size of tank is800mm×650mm×600mm₃.Researches focus on the followings:（1） Parametric model of Taps with Pro/E, and generate family tableinstances; modeling cryogenic tank （and taps model imported from Pro/E） as amulti-body parts model based on ANSYS-Workbench platform, and mesh it.（2） Based on the theory of heat transfer, the curve of hermal physics ofnitrogen and high speed steel tap （W9Mo3Cr4V） are plotted. Pre-treatment ofsimulation include setting the material parameters and boundary conditions. Atlast, its reliability is verified by the experiment.（3） the effectiong of different location positon and array and the rotationspeed of fan and position of the exhaust port are compareed with FLUENT.Relationship among the speed of import liquid nitrogen, cryogenic time and thevalue of liquid nitrogen are analyzed. Also different ways of cryogenic treatment,the copacity of cryogenic tank, the cold through time of different diameter tapsare analyzed..This topic research is supported by Natural Science Foundation of China, the project number is:51275333.