Sinking EDM Research Articles

Technology development for EDM using statistical analysis of arcing information

For the practical use of sinking EDM several technological parameters have to be adjusted in order to ensure secure and efficient working conditions. These are parameters determining the electrical impulse characteristics, parameters influencing the gap-width controller and parameters affecting the flushing mechanism. The final accuracy and surface quality is defined by these technological parameters. To obtain usable parameter-combinations, fitting to the intended EDM-application, extensive technological experiments must be carried out. Usually the producer of the ED-machine has done these experiments in advance for the most common applications. These technological data is normally offered to the user in the form of a database. Own experiments must be performed, if the users application does not fit to these predefined technological data sets. This paper proposes a simplified strategy for the implementation of these technological experiments.

Revisión de las aplicaciones de la electroerosión por penetración al mecanizado de cerámicas conductoras

The term of technical ceramics or advanced ceramics is applied to a great emerging variety of materials, which have excellent properties such as hardness, wear resistance, corrosion resistance, mechanical strength, in a wide range of temperature , among others. Nevertheless, materials with high quality performance are also difficult to manufacture, and ceramic materials are not the exception. The majority of the ceramic materials are not conductive, but however, the use of new metallic pigments and compounds makes it feasible to become them conductive and, therefore, these ceramics can be machined by the EDM process. The present work is a review of the different applications of technical ceramics, concentrating on the conductive ceramics. Moreover, the machining processes that can be employed for their manufacturing are to be shown, focusing attention on the die sinking EDM process.

Effect of Flushing and Electrode Material on Die Sinking EDM

The most important parameters of EDM are the removal rate, the electrode wear, accuracy and surface texture. In this paper the influence of electrode material, flushing, electrode dimension, depth of cut and planetary motion on EDM performance is discussed. An experimental analysis was carried out on a Cr, Mo, V steel for die casting by using both copper and graphite electrodes. Roughing and finishing operations were considered, by adopting for each condition the parameters commonly recommended in industrial production. The observed results show the importance of electrode material, injection flushing and geometry of cutting on removal rate, electrode wear and surface quality.

放電加工の実際（１） 形彫放電加工の原理と実際

放電加工の実際（１） 形彫放電加工の原理と実際

放電加工の放電位置検出に関する研究 第４報 形彫放電加工の放電位置検出

In 2nd report we described that it was possible to detect a discharging position from discharging current waves or time differential current waves on WIRE EDM.In 3rd report we analyzed detecting characteristics considering a skin effect in electrode and workpiece for Die sinking EDM and WIRE EDM which had two branched discharging circuits.Analytical results showed that a shape of gap voltage wave, a discharging pulse duration and loop currents which remained after discharging not only in the branched circuit but also in the electrode and the workpiece, caused detecting errors. To avoid these errors we proposed a new detecting method in which the discharging position was detected from a voltage drop between two branched points on workpiece, but was regularized by a voltage drop on a thick and U-type shunt.In this report, at first we describe some analyticaly obtained results to decrease the effect of the shape of gap voltage wave, the discharging pulse duration and the loop current for the detection of discharging position from the current wave or the time differential current wave.Next we describe experimental results in which the discharging position is detected from the time differential current wave.Finally we describe experimental results in which the discharging position is detected from the voltage drop in workpiece regularized by the voltage drop on U-type shunt. Results show that the detecting accuracy of this method is fine.