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Dependence of Crater Formation in Dry EDM on Electrical Breakdown Mechanism
(2016)Procedia CIRP ~ 18th CIRP Conference on Electro Physical and Chemical Machining (ISEM XVIII)The research effort in dry electrical discharge machining (DEDM) has increased during the last years. The process has advantages in comparison with EDM in oil-based dielectric media, such as low tool electrode wear, thin recast layers on the work piece surface and much more environmentally friendly conditions. However, the plasma-material surface interactions involved in dry EDM are not properly explained yet. Therefore, a characterization ...Conference Paper -
Influence of the anode material on the breakdown behavior in dry electrical eischarge machining
(2012)Procedia CIRP ~ Fifth CIRP Conference on High Performance Cutting 2012In the last years dry electrical discharge machining (DEDM) has been proposed as an alternative to the traditional EDM. The main reason for these efforts is the absence of a liquid dielectric which results in a simpler and environmentally friendly machine. This paper presents measurements of the material removal rate in function of different tool electrode and work piece material put in relation with the breakdown behavior of the process ...Conference Paper -
Investigation of the Fundamentals of Tool Electrode Wear in Dry EDM
(2016)Procedia CIRP ~ 7th HPC 2016 – CIRP Conference on High Performance CuttingConference Paper -
Development and Application of an Eco-design Tool for Machine Tools
(2016)Procedia CIRP ~ The 23rd CIRP Conference on Life Cycle EngineeringImproving the energy efficiency of machine tools is one of the challenges regarding the European energy saving goals. This work presents a new tool, enabling an effective quantification of a machine tool's (MT) energy consumption during all life phases. Scope of the presented tool is the fast and efficient estimation of a MT's cumulated energy demand and the systematic derivation of improvement measures regarding ecological performance. ...Conference Paper -
Post-Coating Treatment of Cutting Edge for Drilling Carbon Fibre Reinforced Plastics (CFRP)
(2016)Procedia CIRP ~ 7th HPC 2016 – CIRP Conference on High Performance CuttingDrilling of highly abrasive carbon fibre reinforced plastics (CFRP) requires carbide tools with geometrical highly adaptable tool geometries andwear resistant diamond coatings. To counteract the tradeoff between long tool lifetime by preferably thick diamond layers leading to largecutting edge radii (bluntness), and the sharpest possible cutting edge to generate flawless machining qualities, the following ...Conference Paper -
EDM Drilling of Non-Conducting Materials in Deionised Water
(2018)Procedia CIRP ~ Proceedings of the 19th ISEM Conference (ISEM - XIX)Electrical discharge machining (EDM) of non-conducting materials currently is only possible with the help of an auxiliary conductive layer, known as assisting electrode, which must be regenerated after each discharge. Therefore, an assisting conductive layer is applied to the surface of the workpiece to initiate the discharge process. In order to continue erosion, the eroded surface regions must have a new conductive layer in contact with ...Conference Paper -
A Kinematic Process Model and Investigation of Surface Roughness for High Efficiency Dry Grinding
(2016)Procedia CIRP ~ 7th HPC 2016 – CIRP Conference on High Performance CuttingA grinding process model based on a kinematic modeling approach is presented. A unique experimental set-up is designed for validation purposes allowing table feed rates of up to 480 m/min. Modeling and experimental verifications are carried out under dry grinding conditions. Separating active and non-active grains during grinding can be controlled by depth of cut. Four basic grain types, such as cuboids, triangle prisms, triangular pyramid ...Conference Paper -
Limits of die-sinking EDM for micro structuring in W300 steel with pure copper electrodes
(2018)Procedia CIRP ~ 8th CIRP Conference on High Performance Cutting (HPC 2018)Electrical discharge machining (EDM) is capable of almost force-free 2D and 3D machining of any kind of conductive material. The micro die-sinking EDM process described in this paper uses electrodes with features in the micrometer scale as a working tool. The ability to machine micro features is desirable for many applications, which range from miniaturization to functionalization of large surfaces. To achieve the desired workpiecès final ...Conference Paper -
A study of the interaction between coolant jet nozzle flow and the airflow around a grinding wheel in cylindrical grinding
(2017)Procedia CIRP ~ 16th CIRP Conference on Modelling of Machining Operations (16th CIRP CMMO)A grinding wheel rotating at high circumferential speed induces a boundary-layer airflow which possibly can detain the coolant from submerging into the grinding zone, in order to prevent thermal damage. To study the profile of the airflow, general laws of fluid dynamics are applied and the analytical results compared with results from CFD simulations. These are used to investigate the interaction of the coolant with the grinding wheel ...Conference Paper -
Simulation and realization of a focus shifting unit using a tunable lens for 3D laser material processing
(2013)Physics Procedia ~ Lasers in Manufacturing (LiM 2013)3D laser microprocessing using current market available technologies reveals itself to be a cost intensive and complex undertaking which is mostly due to the control architecture and use of moving components. Recent market appearance of electronically tunable lenses exhibiting NIR transmission, large aperture, high damage threshold and fast response times are available for laser based applications. Hence, enabling usage in the field of ...Conference Paper