Abstract-Electrical Discharge/Spark Machining process is one of the advanced machining processes that can machine the various complex shapes from all conductor and semiconductor materials. Wide and diverse applications of spark micromachining process in microfabrication and micro to nano miniaturization tendency is promising application of spark nanomachining process in nanofabrication. Spark nanomachining process is a thermal machining process in which thermal energy produced by electric sparks is used for machining. Therefore, thermal modeling of the spark nanomachining process is very important for accurate understanding of the process and its better application in nanotechnology. In this study, thermal model of workpiece in the spark nanomachining process has been developed. The impact of variables of the spark nanomachining process on temperature distribution in the workpiece and dimensions of the machined nano-craters were analyzed.

Abstract-ElectricalDischarge/Spark Machining (EDM/ESM) is an advanced machining process that has various applications in macro and micro fabrication. Advantages and intrinsic potentials of the process is promising application of this process in nanofabrication. The spark nanomachining is a precise, sensitive and costly process. Therefore, simulation of nano-hole produced by each spark in this process prevents spending extra time and cost to perform spark nanomachining process through trial and error method. In this paper nano-hole machined by the spark nanomachining process on a gold nano-film is simulated under practically experimental conditions. Radius, depth and volume of the nano-hole are evaluated versus process conditions. It is observed that radius of the nano-hole is increased exponentially with increasing spark pulse duration. Also, depth, volume of the removed material from the workpiece surface and material removal rate (MRR) are increased with increasing consumed energy by each spark.

Abstract-This paper presents optimization of nano calcium carbonate production parameters to achieve the optimum production rate by using Taguchi method. The combination of optimum level of process parameters was obtained by using the analysis of signal-to-noise (S/N) ratio. The level of importance of the process parameters on production rate was determined by using analysis of variance (ANOVA). It was found that the optimum level of process parameters are solution flow rate of 9 lit/min, gas flow rate of 20 lit/min, and solution concentration of 70 gr/lit within the range of experiments and the process parameters in terms of impact significance were found to be gas flow rate, solution concentration, and solution flow rate, respectively. By using the optimum level of the process parameters, the production rate was enhanced by 168% in comparison to the mean value of the experimental results.Index Terms-Calcium carbonate, nano calcium carbonate, taguchi method, rotation packed bed.