Evaluation of Micro-EDM (μEDM) Characteristics of Conductive Silicon Carbide Using a Coupled Thermo-Structural Process Model
Evaluation of Micro-EDM (μEDM) Characteristics of Conductive Silicon Carbide Using a Coupled Thermo-Structural Process Model
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DOI：
10.1142/s0219686718500245
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发表时间：
2018-07
影响因子：
1.4
通讯作者：
K. Saxena;S. Agarwal;R. Das
中科院分区：
文献类型：
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作者：
K. Saxena;S. Agarwal;R. Das
在这项工作中，微细电火花加工（[公式：见正文]电火花加工）的导电SiC的特性进行了评估，使用现有的热-结构耦合模型的知识。采用一个简化的导电SiC电火花加工热结构模型，对导电SiC电火花加工过程进行了数值模拟。迄今为止，电火花加工的研究主要采用传统的熔化和蒸发去除机制，这是适用于金属的。在陶瓷的情况下，材料去除发生的各种现象，如剥落，熔化，蒸发，它取决于[公式：见文字]电火花加工的能量和陶瓷的类型。因此，我们的目标是在这里使用的热结构模型的SiC陶瓷的特性进行评估。为了使模型更符合实际，采用了高斯热流分布，并进行了瞬态研究。该模型使用工艺参数（电压，电容和时间）和材料属性作为输入，以预测瞬态温度分布，凹坑尺寸，材料去除量和热残余应力。为了模拟材料去除，已经执行了元件死亡。元件死亡完全基于达到适合于材料去除的特定温度，而与材料去除机理无关。在加热阶段进行了瞬态热分析，在冷却阶段进行了结构分析。进行了观测实验，以增加模型预测的价值。
In this work, micro-EDM ([Formula: see text]EDM) characteristics of conductive SiC have been evaluated using the knowledge of existing coupled thermo-structural model. A simplified thermo-structural model of [Formula: see text]EDM process on conductive SiC has been used to simulate the [Formula: see text]EDM process on conductive SiC. So far, the studies have used traditional melting and evaporation removal mechanism during EDM simulation which is suitable for metals. In case of ceramics, material removal occurs by various phenomenon such as spalling, melting, evaporation and it depends on [Formula: see text]EDM energy and type of ceramic. Thus, we aim here to evaluate the characteristics of a SiC ceramic using the thermo-structural model. To make the model more realistic, Gaussian heat flux distribution has been used and transient study has been performed. The model uses process parameters (voltage, capacitance and time) and material properties as input to predict the transient temperature distribution, crater dimensions, volume of material removed and thermal residual stresses. To simulate the material removal, element death has been performed. The element death is purely based on attainment of certain temperature suitable for material removal irrespective of material removal mechanism. The transient thermal analysis was carried out in heating phase and the structural analysis was carried out in cooling phase. Observatory experiments were performed to add value to the model predictions.