Numerical Simulation of Temperature for Si3N4 Ceramics During Micro-detonation of Arc Strike Machining
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摘要: 建立Si3N4陶瓷引弧微爆炸加工过程中温度场的数学模型,进一步明确了该新型加工技术的加工机理。基于有限元理论,利用工程数值模拟软件Patran和Nastran对Si3N4陶瓷引弧微爆炸加工的温度场分布进行了模拟,对加工后冲击凹坑的深度和宽度进行了预测,得到了不同加工参数对冲击凹坑形状的影响规律。仿真结果表明:Si3N4陶瓷引弧微爆炸加工的最高温度达到12 000℃以上,但高温影响区范围很小;其温度分布在加工区内随着脉冲持续时间的增加和加工电流的增大而增加,在加工区外温度保持室温不变。模拟结果为Si3N4陶瓷表面形貌的预测、引弧微爆炸加工机理的揭示、加工参数的合理选择等提供了理论依据。试验验证了仿真结果的正确性。Abstract: A theoretical model of temperature for Si3N4 ceramics during micro-detonation of arc strike machining was established,further clarifying the machining mechanism of this new machining technique.Based on finite element method,the temperature of Si3N4 ceramics during micro-detonation of arc strike machining was simulated with the aid of Patran and Nastran softwares;the width and depth of crater impacted by micro-detonation were calculated,obtaining the influence rule of different machining parameters on the shape of impact crate.The results show that the highest temperature of Si3N4 ceramics is over 12 000 ℃ while the high-temperature zone is quite small.With the increase of pulse duration and electricity,the temperature within the machined zone increases rapidly and the temperature outside the machined zone keeps room temperature.The simulation results provide the governing theory for the prediction of the surface appearance of Si3N4 ceramics、the disclosure of the machining mechanism of micro-detonation of arc strike、the appropriate choice of the machining parameter and so on.The data gained from the simulation is proved to be accordant with the experimental data.
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